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New technologies and smart policies of Yuganskneftegaz have improved the condition of the Priobskoye oil field, whose geological reserves are at the level of 5 billion tons of oil.
The Priobskoye Oil Field is a giant oil field in Russia. This inaccessible and remote field is located 70 km from the city of Khanty-Mansiysk and 200 kilometers from the city of Nefteyugansk. It is included in the West Siberian oil and gas province. About 80% of the Priobsky NM is located directly in the floodplain of the Ob River and is divided by water into two parts. A special feature of Priobskoye is flooding during flood periods.
Main geological and physical characteristics of the deposit
A distinctive feature of Priobskoe is its complicated geological structure, characterized by multi-layers and a low degree of productivity. The reservoirs of the main productive formations are characterized by low permeability, low sand content, high levels of clay content and high dissection. These factors require the use of hydraulic fracturing technologies in the development process.
The deposits are located no deeper than 2.6 km. Oil density indicators are 0.86–0.87 tons per m³. The amount of paraffins is moderate and does not exceed 2.6%, the amount of sulfur is about 1.35%.
The field is classified as sulfurous and has oil class II in accordance with GOST for refineries.The deposits are classified as lithologically screened and have the elasticity and closedness of the natural regime. The thickness of the layers ranges from 0.02 to 0.04 km. The reservoir pressure has initial values of 23.5–25 MPa. The temperature regime of the formations remains in the range of 88–90°C. The reservoir type of oil has stable viscosity parameters and has a dynamic coefficient of 1.6 MPa s, as well as the effect of oil saturation at a pressure of 11 MPa.
Characterized by the presence of waxiness and low resinity of the naphthenic series. Initial daily volume of functioning oil wells varies from 35 to 180 tons. The type of wells is based on a cluster arrangement, and the maximum recovery factor is 0.35 units. The Priobskoye oil field produces crude oil with a significant amount of light hydrocarbons, which entails the need for stabilization or isolation of APG.
Start of development and amount of reserves
The Priobskoe oil deposit was discovered in 1982. In 1988, development of the left bank part of the field began, and eleven years later they began development of the right bank.
The number of geological reserves is 5 billion tons, and the proven and recoverable quantity is estimated at almost 2.5 billion tons.
Peculiarities of production at the field
The duration of development under the terms of the Production Sharing Agreement was assumed to be no more than 58 years. The maximum level of oil production is almost 20 million tons after 16 years from the date of development.
Financing for initial stage It was planned at the level of $1.3 billion. The capital expenditure item accounted for $28 billion, and the cost of operational work amounted to $27.28 billion. It was planned to involve the Latvian city of Ventspils, Odessa, and Novorossiysk as destinations for transporting oil from NM.
According to 2005 data, the field has 954 production wells and 376 injection wells.Companies developing the field
In 1991, the Yuganskneftegaz and Amoso companies began discussing the prospects of joint developments in the northern 
shore of NM Priobskoe.
In 1993, the Amoso company won the competition and received exclusive right for the development of the Priobskoye oil field together with Yuganskneftegaz. A year later, the companies prepared and submitted to the government a project agreement on the distribution of products, as well as an environmental and feasibility study of the developed project.
In 1995, the government reviewed an additional feasibility study, which reflected new data on the Priobskoye field. By order of the Prime Minister, a government delegation was formed, including representatives of the Khanty-Mansi Autonomous Okrug, as well as some ministries and departments, in order to negotiate a Production Sharing Agreement in the context of the development of the northern segment of the Priobskoye field.
In mid-1996, a statement was heard in Moscow by a joint Russian-American commission on the priority of design innovations in the energy industry, including on the territory of the Priobskoye oil and gas mine.
In 1998, Yuganskneftegaz partnered in the development of the Priobskoye oil field, American company"Amoso", absorbed by the British British company Petroleum, and an official statement was received from BP/Amoso to terminate participation in the project to develop the Priobskoye field.
Then the subsidiary state company Rosneft, which received control over the central asset of Yukos, Yuganskneftegaz, RN-Yuganskneftegaz LLC, was involved in the exploitation of the field.
In 2006, specialists from NM Priobskoye and the Newco Well Service company carried out the largest hydraulic fracturing of an oil reservoir in the Russian Federation, into which they managed to pump 864 tons of proppant. The operation lasted seven hours; the live broadcast could be watched through the Yuganskneftegaz Internet office.Now LLC RN-Yuganskneftegaz is steadily working on the development of the northern part of the Priobskoye oil field, and the development of the southern segment of the field is being carried out by Gazpromneft-Khantos LLC, which belongs to the Gazpromneft company. The southern segment of the Priobskoye oil field has small licensed areas. Since 2008, the development of the Sredne-Shapshinsky and Verkhne-Shapshinsky segments has been carried out by NAC AKI OTYR, which belongs to OJSC Russneft.
Prospects for Priobsky NM
A year ago, the Gazpromneft-Khantos company became the owner of a license to conduct geological research of parameters related to deep oil-saturated horizons. The southern part of the Priobskoye oil deposit, including the Bazhenov and Achimov formations, is subject to research.
Last year was marked by the analysis of geographic data on the territory of the Bazheno-Abalak complex of the South Priobsky oil field. A set of specialized core analysis and assessment of this class of reserves involves the procedure of drilling four exploration and appraisal wells with an inclined direction.
Horizontal wells will be drilled in 2016. To estimate the volume of recoverable reserves, multi-stage hydraulic fracturing is planned.
Impact of the deposit on the ecology of the area
The main factors influencing the environmental situation in the field area are the presence of emissions into the atmosphere 
layers. These emissions include petroleum gas, oil combustion products, and components of evaporation from light hydrocarbon fractions. In addition, spills of oil products and components onto the soil are observed.
The unique territorial feature of the deposit is due to its location on floodplain river landscapes and within the water protection zone. Making specific development requirements is based on high value. In this situation, floodplain lands are considered, with characteristic high dynamism and complex hydrological regime. This territory was chosen for nesting migratory birds semi-aquatic species, many are included in the Red Book. The deposit is located on the territory migration routes and wintering grounds for many rare representatives of ichthyofauna.
Even 20 years ago, the Central Commission for the Development of NM and GPS under the Ministry of Fuel and Energy of Russia, as well as the Ministry of Protection environment and natural resources of Russia, the exact scheme for the development of the Priobskoye oil deposit and the environmental part of all preliminary design documentation were approved.
The Priobskoye deposit is cut into two parts by the Ob River. It is swampy and during a flood, most of it is flooded. It was precisely these conditions that contributed to the formation of fish spawning grounds on the territory of the NM. The Ministry of Fuel and Energy of Russia presented materials to the State Duma, on the basis of which it was concluded that the development of the Priobskoye oil pipeline is complicated due to existing natural factors. Such documents confirm the need for additional financial resources in order to use only the latest and environmentally friendly technologies on the territory of the field, which will allow highly efficient implementation of environmental protection measures.
Oil fields of Russia
http://www.kommersant.ru/doc-rss.aspx?DocsID=1022611
The northern three quarters of the field was controlled by YUKOS via an its daughter-company Yuganskneftegaz, and began oil production in 2000. In 2004 Yuganskneftegaz was bought by Rosneft, which is now the operating company for that portion of the field. The southern quarter of the field was controlled by Sibir energy, which began a joint venture with Sibneft to develop the field, with volume production beginning in 2003. Sibneft subsequently acquired complete control of the field via a corporate maneuver to dilute Sibir's holding. Sibneft is now majority controlled by Gazprom and renamed Gazprom Neft.
http://en.wikipedia.org/wiki/Priobskoye_field
Priobskoye field(KhMAO)
Reserves, million tons
ABC1 - 1061.5
C2 - 169.9
Production in 2007, million tons - 33.6
For many years, the largest field, both in terms of reserves and oil production volumes, was the Samotlor field. In 2007, for the first time it lost first place to the Priobskoye field, oil production from which reached 33.6 million tons (7.1% of Russian production), and proven reserves increased compared to 2006 by almost 100 million tons (taking into account redemption at production).
http://www.mineral.ru/Facts/russia/131/288/index.html
Abdulmazitov R.D. Geology and development of the largest and unique oil and oil and gas fields in Russia.
http://geofizik.far.ru/book/geol/geol009.htm
http://rutracker.org/forum/viewtopic.php?t=1726082
http://www.twirpx.com/file/141095/
http://heriot-watt.ru/t2588.html
Priobskoye is a giant oil field in Russia. Located in the Khanty-Mansiysk Autonomous Okrug, near Khanty-Mansiysk. Opened in 1982. Divided by the Ob River into two parts - left and right banks. Development of the left bank began in 1988, the right - in 1999.
Geological reserves are estimated at 5 billion tons. Proven and recoverable reserves are estimated at 2.4 billion tons.
The deposit belongs to the West Siberian province. Opened in 1982. Deposits at a depth of 2.3-2.6 km. Oil density is 863-868 kg/m3, moderate paraffin content (2.4-2.5%) and sulfur content 1.2-1.3%.
As of the end of 2005, there are 954 production wells and 376 injection wells in the field, of which 178 wells were drilled over the past year.
Oil production at the Priobskoye field in 2007 amounted to 40.2 million tons, of which Rosneft - 32.77, and Gazprom Neft - 7.43 million tons.
Currently, the development of the northern part of the field is carried out by RN-Yuganskneftegaz LLC, owned by Rosneft, and the southern part by Gazpromneft-Khantos LLC, owned by Gazprom Neft.
http://ru.wikipedia.org/wiki/Priobskoye_oil_field
http://www.blackbourn.co.uk/databases/hydrocarbon-province-maps/west-siberia.pdf
PRIOBSKOE: THERE ARE 100 MILLION! (Rosneft: Company Bulletin, September 2006) -
On May 1, 1985, the first exploration well was drilled at the Priobskoye field. In September 1988, production production began on its left bank using the flowing method from well No. 181-R with a flow rate of 37 tons per day. On the last day of July 2006, Priobsky oil workers reported the production of the 100 millionth ton of oil.
The license for the development of the field belongs to OJSC Yuganskneftegaz.
Largest deposit Western Siberia- Priobskoe - administratively located in the Khanty-Mansiysk region at a distance of 65 km from Khanty-Mansiysk and 200 km from Nefteyugansk. Priobskoye was discovered in 1982. It is divided by the Ob River into two parts - the left and right banks. Development of the left bank began in 1988, the right - in 1999.
According to the Russian classification, proven oil reserves amount to 1.5 billion tons, recoverable reserves amount to more than 600 million.
According to an analysis prepared by the international audit company DeGolyer & MacNaughton, as of December 31, 2005, the oil reserves of the Priobskoye field according to the SPE methodology are: proven 694 million tons, probable - 337 million tons, possible - 55 million tons.
Reserves for the field according to Russian standards as of January 1, 2006: NGZ (Oil and Gas Reserves) - 2476.258 million tons.
Oil production at the Priobskoye field in 2003 amounted to 17.6 million tons, in 2004 - 20.42 million tons, in 2005 - 20.59 million tons. In the company's strategic development plans, the Priobskoye deposit is given one of the main places - by 2009 it is planned to produce up to 35 million tons here.
On the last day of July 2006, Priobsky oil workers reported the production of the 100 millionth ton of oil. 60% of the territory of the Priobskoye field is located in the flooded part of the Ob River floodplain; environmentally friendly technologies are used in the construction of well pads, pressure oil pipelines and underwater crossings.
History of the Priobskoye field:
In 1985, industrial oil reserves were discovered; testing of well 181r resulted in an influx of 58 m3/day
In 1989, drilling of 101 clusters began (Left Bank)
In 1999 - commissioning of wells in 201 clusters (Right Bank)
In 2005, daily production amounted to 60,200 tons/day, the production stock of 872 wells, 87,205.81 thousand tons produced since the beginning of development.
In recent years alone, using directional drilling, 29 underwater crossings have been completed in the field, including 19 new ones built and 10 old ones reconstructed.
Site facilities:
Booster pumping stations - 3
Multiphase pumping station Sulzer - 1
Cluster pumping stations for pumping working agent into the formation - 10
Floating pumping stations - 4
Oil preparation and pumping workshops - 2
Oil separation unit (OSN) - 1
In May 2001, a unique Sulzer multiphase pumping station was installed at the 201st cluster on the right bank of the Priobskoye field. Each pump of the installation is capable of pumping 3.5 thousand cubic meters of liquid per hour. The complex is served by one operator, all data and parameters are displayed on a computer monitor. The station is the only one in Russia.
The Dutch Rosskor pumping station was installed at the Priobskoye field in 2000. It is designed for in-field pumping of multiphase liquid without the use of flares (to avoid flaring of associated gas in the floodplain part of the Ob River).
The drill cuttings processing plant on the right bank of the Priobskoye field produces sand-lime brick, which is used as building material for the construction of roads, cluster foundations, etc. To solve the problem of utilization of associated gas produced at the Priobskoye field, the first gas turbine power plant in the Khanty-Mansi Autonomous Okrug was built at the Prirazlomnoye field, providing electricity to the Priobskoye and Prirazlomnoye fields.
The power transmission line built across the Ob River has no analogues; its span is 1020 m, and the diameter of the wire, specially manufactured in the UK, is 50 mm.
http://vestnik.rosneft.ru/47/article4.html
November 5, 2009 became another significant day in the history of Yuganskneftegaz - the 200 millionth ton of oil was produced at the Priobskoye field. Let us remember that this giant oil field was discovered in 1982. The field is located near Khanty-Mansiysk and is divided into two parts by the Ob River. Development of the left bank began in 1988, the right - in 1999. The 100 millionth ton of oil was produced at the field in July 2006.
http://www.uralpolit.ru/86/econom/tek/id_160828.html
03/24/2010 Rosneft plans to produce 29.6 million tons of oil at the Priobskoye field in 2010, which is 12.4% less than what was produced in 2009, according to a statement from the company’s information department. In 2009, Rosneft produced 33.8 million tons of oil from the field.
In addition, according to the message, today Rosneft commissioned the first stage of a gas turbine power plant (GTPP) at the Priobskoye oil and gas field. The capacity of the first stage of the GTPP is 135 MW, the second stage is planned to be commissioned in May 2010, the third - in December. The total capacity of the station will be 315 MW. Construction of the station along with auxiliary facilities will cost Rosneft 18.7 billion rubles. At the same time, according to the report, due to the abandonment of hydraulic structures and the installation of steam power equipment, capital costs for the construction of gas turbine power plants were reduced by more than 5 billion rubles.
The head of Rosneft, Sergei Bogdanchikov, noted that the commissioning of the Priobskaya GTPP solves three problems simultaneously: utilization of associated gas (APG), provision of electricity to the field, as well as stability of operation energy system region.
In 2009, Rosneft produced more than 2 billion cubic meters from the Priobskoye field. m of associated petroleum gas (APG), but used only a little more than 1 billion cubic meters. m. By 2013, the picture will change: despite the reduction in APG production to 1.5 billion cubic meters. m, its use will reach 95%, the report notes.
According to S. Bogdanchikov, Rosneft is considering the possibility of providing Gazprom Neft with its pipe for transporting associated petroleum gas from the Priobskoye field for utilization at the Yuzhno-Balyksky gas processing complex of the SIBUR company. RBC reports this.
http://www.oilcapital.ru/news/2010/03/241042_151839.shtml
Rosneft provides up to 30% of its energy consumption with its own facilities. Power plants operating on associated gas have been built: at the Priobskoye field, at Vankor, in the Krasnodar Territory.
http://museum.rosneft.ru/future/chrono/year/2020/
19/12/2009
Gazprom Neft has launched the first stage of the Yuzhno-Priobskaya gas turbine power plant (GTPP) at the Priobskoye field (KhMAO), built by the company for its own production needs, the company said in a statement.
The capacity of the first stage of the GTPP was 48 MW. Volume capital investments for the introduction of the first stage - 2.4 billion rubles.
Currently, Gazpromneft-Khantos' electricity needs amount to about 75 MW of electricity and, according to calculations by company specialists, by 2011 energy consumption will increase to 95 MW. In addition, in the coming years, the tariffs of the Tyumen energy system will increase significantly - from 1.59 rubles per kWh in 2009 to 2.29 rubles per kWh in 2011.
The launch of the second stage of the power plant will increase the energy generating capacity of Gazpromneft-Khantos to 96 MW and will fully satisfy the enterprise's electricity needs.
The Priobskoye field is a key asset of Gazprom Neft, occupying almost 18% of the company’s production structure.
http://www.rian.ru/economy/20091219/200247288.html
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Disaggregation of development objects as a method of increasing oil recovery
At the Priobskoye field, three formations are being developed jointly - AC10, AS11, AS12, and the permeability of the AC11 formation is an order of magnitude higher than the permeability of the AC10 and AS12 formations. To effectively develop reserves from low-permeability AC10 and AC12 formations, there is no other alternative than the introduction of ORRNEO technology, primarily at injection wells.
http://www.neftegaz.ru/science/view/428
Methodology for integrated interpretation of well logging results used at OJSC ZSK TYUMENPROMGEOFIZIKA when studying terrigenous sections
http://www.tpg.ru/main.php?eng=&id=101&pid=85
Frolovskaya facies zone of the Neocomian of Western Siberia in the light of assessing the prospects for oil and gas potential
http://www.neftegaz.ru/science/view/486
http://www.oilnews.ru/magazine/2005-15-09.html
Literature
Regional stratigraphic schemes of Mesozoic deposits of the West Siberian Plain. - Tyumen. - 1991.
Geology of oil and gas in Western Siberia // A.E. Kontorovich, I.I. Nesterov, V.S. Surkov et al. - M.: Nedra. - 1975. - 680 p.
Catalog of stratigraphic breakdowns // Tr. ZapSibNIGNI.-1972.- Issue. 67.-313 p.
Argentovsky L.Yu., Bochkarev V.S. and others. Stratigraphy of Mesozoic deposits of the platform cover of the West Siberian plate // Problems of geology of the West Siberian oil and gas province / Tr. ZapSibNIGNI.- 1968.- Issue 11.- 60 p.
Sokolovsky A.P., Sokolovsky R.A. Anomalous types of sections of the Bazhenov and Tutleim formations of Western Siberia // Bulletin of the subsoil user of the Khanty-Mansi Autonomous Okrug. - 2002.-11.- P. 64-69.
Efficiency of oil field development
In Russia, both horizontal wells and hydraulic fracturing are used in sufficient quantities in low-permeability reservoirs, for example, in the Priobskoye field, where the permeability is only from 1 to 12 millidarcy and hydraulic fracturing is simply not possible.
http://energyland.info/analitic-show-neft_gaz-neftegaz-52660
A new environmental scandal in the Khanty-Mansiysk Autonomous Okrug. Once again, its participant was the well-known company Rosekoprompererabotka, which became famous for polluting the Vakh River in the domain of TNK-BP.
http://www.ura.ru/content/khanti/15-07-2010/articles/1036255339.html
Improving the quality of cementing casing strings at the Yuzhno-Priobskoye field
http://www.burneft.ru/archive/issues/2009-12/6
Thermal gas impact and deposits of Siberia
http://www.energyland.info/analitic-show-52541
Thermal gas method and the Bazhenov formation
http://energyland.info/analitic-show-50375
Introduction of simultaneous separate injection at the Priobskoye field
http://www.oil-info.ru/arxivps/pdf/ORZ_N.pdf
Conversion of Priobskoye field wells to an adaptive electric centrifugal pump control system
http://www.elekton.ru/pdf/adaptive%20exploitation.pdf
Analysis of ESP failures at Russian fields
http://neftya.ru/?p=275
Interruptions during the formation of Neocomian clinoforms in Western Siberia
http://geolib.narod.ru/Journals/OilGasGeo/1993/06/Stat/01/stat01.html
Improving the technology of simultaneous-separate injection for multi-layer fields
http://www.rogtecmagazine.com/rus/2009/09/blog-post_1963.html
LLC "Mamontovsky KRS"
Work at the fields of Mamontovsky, Maysky, Pravdinsky, Priobsky regions
http://www.mkrs.ru/geography.aspx
28.01.2010
Even before the New Year, environmental inspections were completed at the two largest fields in Ugra, Samotlor and Priobskoye. Based on the results, disappointing conclusions were drawn: oil workers not only destroy nature, but also underpay at least 30 billion rubles a year to budgets at various levels.
http://www.t-i.ru/article/13708/
"Siberian Oil", No. 4(32), April 2006. "There is room to move"
http://www.gazprom-neft.ru/press-center/lib/?id=685
BP/AMOCO Withdraws from Priobskoye Project, 1999-03-28
http://www.russiajournal.com/node/1250
Photo
Priobskoye field
http://www.amtspb.ru/map.php?objectID=15
"Priobskoye field, Khanty-Mansi Autonomous Okrug. SGK-Burenie company."
http://nefteyugansk.moifoto.ru/112353
Yuzhno-Priobskoye field
The Priobskoye field is located in the central part of the West Siberian Plain. Administratively, it is located in the Khanty-Mansiysk region, 65 km east of Khanty-Mansiysk and 100 km west of the city. Nefteyugansk.
During the period 1978-1979 As a result of detailed seismic exploration of CDP, the Priobskoe uplift was identified. From this moment, a detailed study of the geological structure of the territory begins: the widespread development of seismic exploration in combination with deep drilling.
The discovery of the Priobskoye field took place in 1982 as a result of drilling and testing of well 151, when commercial inflow was obtained oil flow rate of 14.2 m 3 /day at a 4 mm choke from the intervals of 2885-2977 m (Tyumen formation YUS 2) and 2463-2467 m (formation AS 11 1) - 5.9 m 3 /day at a dynamic level of 1023 m.
Priob structure, according to the tectonic map of the Meso-Cenozoic platform cover.
The West Siberian geosyneclise is located in the junction zone of the Khanty-Mansi depression, the Lyaminsky megatrough, the Salym and West Lyaminsky groups of uplifts.
The first-order structures are complicated by swell-shaped and dome-shaped uplifts of the second order and individual local anticlinal structures, which are the objects of prospecting and exploration work on oil And gas.
The productive formations in the Priobskoye field are the formations of the "AS" group: AS 7, AS 9, AS 10, AS 11, AS 12. In stratigraphic terms, these layers belong to the Cretaceous deposits of the Upper Vartov Formation. Lithologically, the Upper Vartovskaya formation is composed of frequent and uneven interbedding of mudstones with sandstones and siltstones. The mudstones are dark gray, gray with a greenish tint, silty, micaceous. Sandstones and siltstones are gray, clayey, micaceous, fine-grained. Among the mudstones and sandstones there are interlayers of clayey limestones and siderite concretions.
The rocks contain charred plant detritus, rarely bivalves (inocerams) of poor and moderate preservation.
Permeable rocks of productive formations have a northeastern and submeridial strike. Almost all formations are characterized by an increase in the total effective thicknesses and sand content coefficient, mainly in the central parts of reservoir development zones, to increase reservoir properties and, accordingly, the strengthening of clastic material occurs in the eastern (for layers of the AC 12 horizon) and northeastern directions (for horizon AC 11).
Horizon AC 12 is a thick sandy body, elongated from southwest to northeast in the form of a wide strip with a maximum effective thickness in the central part of up to 42 m (well 237). In this horizon, three objects are distinguished: layers AC 12 3, AC 12 1-2, AC 12 0.
Deposits of the AC 12 3 formation are presented in the form of a chain of sandy lens-shaped bodies with a northeastern strike. Effective thicknesses vary from 0.4 m to 12.8 m, with higher values confined to the main deposit.
The main deposit AS 12 3 was discovered at depths of -2620 and -2755 m and is lithologically screened on all sides. The dimensions of the deposit are 34 x 7.5 km, and the height is 126 m.
Deposit AS 12 3 in the area of well. 241 was discovered at depths of -2640-2707 m and is confined to the Khanty-Mansi local uplift. The deposit is controlled from all sides by reservoir replacement zones. The dimensions of the deposit are 18 x 8.5 km, height - 76 m.
Deposit AS 12 3 in the area of well. 234 was discovered at depths of 2632-2672 m and represents a lens of sandstones on the western dip of the Priob structure. The deposit dimensions are 8.5 x 4 km, and the height is 40 m, the type is lithologically screened.
Deposit AS 12 3 in the area of well. 15-C was discovered at depths of 2664-2689 m within the Seliyarovsky structural ledge. The dimensions of the lithologically screened deposit are 11.5 x 5.5 km, and the height is 28 m.
The AS 12 1-2 deposit is the main one and is the largest in the field. It is confined to a monocline, complicated by local uplifts of small amplitude (region of wells 246, 400) with transition zones between them. It is limited on three sides by lithological screens and only in the south (towards the East Frolovskaya area) do reservoirs tend to develop. However, given the significant distances, the boundary of the deposit is still conditionally limited by a line running 2 km south of the well. 271 and 259. Oil-saturated thicknesses vary over a wide range from 0.8 m (well 407) to 40.6 m (well 237) tributaries oil up to 26 m 3 /day on a 6 mm fitting (well 235). The dimensions of the deposit are 45 x 25 km, height - 176 m.
Deposit AS 12 1-2 in the area of well. 4-KhM was discovered at depths of 2659-2728 m and is confined to a sand lens on the northwestern slope of the Khanty-Mansiysk local uplift. Oil-saturated thicknesses vary from 0.4 to 1.2 m. The dimensions of the deposit are 7.5 x 7 km, height - 71 m.
Deposit AS 12 1-2 in the area of well. 330 discovered at depths of 2734-2753m Oil-saturated thicknesses vary from 2.2 to 2.8 m. The dimensions of the deposit are 11 x 4.5 km, height - 9 m. Type - lithologically screened.
The deposits of the AC 12 0 formation - the main one - were discovered at depths of 2421-2533 m. It is a lens-shaped body oriented from southwest to northeast. Oil-saturated thicknesses vary from 0.6 (well 172) to 27 m (well 262). Tributaries oil up to 48m 3 /day on an 8 mm fitting. The dimensions of the lithologically screened deposit are 41 x 14 km, height - 187 m. AC 12 0 deposit in the area of the well. 331 was discovered at depths of 2691-2713 m and represents a lens of sandy rocks. Oil-saturated the thickness in this well is 10 m. Dimensions 5 x 4.2 km, height - 21 m. Flow rate oil- 2.5 m 3 /day at Hd = 1932 m.
The AS 11 formation deposit is 2-4 lithologically screened type, there are 8 in total, opened by 1-2 wells. In areal terms, the deposits are located in the form of 2 chains of lenses in the eastern part (the most elevated) and in the west in the more submerged part of the monoclinal structure. Oil-saturated thicknesses in the east increase by 2 or more times compared to western wells. The total range of change is from 0.4 to 11 m.
The AS 11 2-4 formation deposit in the area of well 246 was discovered at a depth of 2513-2555 m. The dimensions of the deposit are 7 x 4.6 km, height - 43 m.
Deposit of formation AS 11 2-4 in the area of well. 247 was discovered at a depth of 2469-2490 m. The dimensions of the deposit are 5 x 4.2 km, height - 21 m.
Deposit of formation AS 11 2-4 in the area of well. 251 was discovered at a depth of 2552-2613 m. The dimensions of the deposit are 7 x 3.6 km, height - 60 m.
Deposit of formation AS 11 2-4 in the area of well. 232 was opened at a depth of 2532-2673 m. The dimensions of the deposit are 11.5 x 5 km, height - 140 m.
Deposit of formation AS 11 2-4 in the area of well. 262 was opened at a depth of 2491-2501m. The dimensions of the deposit are 4.5 x 4 km, height - 10 m.
The AS 11 2-4 formation deposit in the area of well 271 was discovered at a depth of 2550-2667 m. The dimensions of the deposit are 14 x 5 km.
Deposit of formation AS 11 2-4 in the area of well. 151 were opened at a depth of 2464-2501 m. The dimensions of the deposit are 5.1 x 3 km, height - 37 m.
Deposit of formation AS 11 2-4 in the area of well. 293 was discovered at a depth of 2612-2652 m. The dimensions of the deposit are 6.2 x 3.6 km, height - 40 m.
The deposits of the AS 11 1 formation are confined mainly to the near-crest part in the form of a wide strip of north-eastern strike, limited on three sides by clay zones.
The main deposit AS 11 1 is the second largest within the Priobskoye field, discovered at depths of 2421-2533 m. On three sides the deposit is limited by clay zones, and in the south the border is drawn conditionally, along a line running 2 km south of well 271 and 259. Debits oil vary from 2.46 m 3 /day at a dynamic level of 1195 m (well 243) to 118 m 3 /day through an 8 mm fitting (well 246). Oil-saturated thicknesses vary from 0.4 m (well 172) to 41.6 (well 246). The dimensions of the deposit are 48 x 15 km, height up to 112 m, type - lithologically screened.
Deposits of the AS 11 0 formation. The AS 11 0 formation has a very small zone of development of reservoirs in the form of lens-shaped bodies, confined to the submerged areas of the near-crest part.
Deposit AC 11 0 in the area of the well. 408 was opened at a depth of 2432-2501 m. The dimensions of the deposit are 10.8 x 5.5 km, height - 59 m, lithologically screened type. Debit oil from well 252 was 14.2 m3/day at Нд =1410 m.
Deposit AC 11 0 in the area of the well. 172 was penetrated by one well at a depth of 2442-2446 m and has dimensions of 4.7 x 4.1 km, height - 3 m. Flow rate oil amounted to 4.8 m 3 /day at Hd = 1150 m.
Deposit AC 11 0 in the area of the well. 461 measures 16 x 6 km. Oil-saturated thickness varies from 1.6 to 4.8 m. Type of deposit - lithologically screened. Debit oil from well 461 was 15.5 m 3 /day, Nd = 1145 m.
Deposit AC 11 0 in the area of the well. 425 was penetrated by one well. Oil-saturated power - 3.6 m. Flow rate oil amounted to 6.1 m 3 /day at Нд =1260 m.
The AS 10 horizon was discovered within the central zone of the Priobskoye field, where it is confined to more submerged areas of the near-crest part, as well as to the southwestern wing of the structure. The division of the horizon into layers AS 10 1, AS 10 2-3 (in the central and eastern parts) and AS 10 2-3 (in the western) is to a certain extent arbitrary and is determined by the conditions of occurrence and formation of these deposits, taking into account the lithological composition of the rocks and the physical chemical characteristics oils.
The main deposit AS 10 2-3 was discovered at depths of 2427-2721 m and is located in the southern part of the field. Debits oil are in the range from 1.5 m 3 /day at an 8 mm fitting (well 181) to 10 m 3 /day at Nd = 1633 m (well 421). Oil-saturated thicknesses range from 0.8 m (well 180) to 15.6 m (well 181). The dimensions of the deposit are 31 x 11 km, the height is up to 292 m, the deposit is lithologically screened.
Deposit AC 10 2-3 in the area of the well. 243 discovered at depths of 2393-2433 m. Production rate oil is 8.4 m 3 /day at Нд =1248 m (well 237). Oil-saturated thickness - 4.2 - 5 m. Dimensions 8 x 3.5 km, height up to 40 m. Type of deposit - lithologically screened.
Deposit AC 10 2-3 in the area of the well. 295 was opened at depths of 2500-2566 m and is controlled by zones of clay formation. Oil-saturated thicknesses vary from 1.6 to 8.4 m. In the well. 295, 3.75 m 3 /day was obtained at Hd = 1100 m. The dimensions of the deposit are 9.7 x 4 km, height - 59 m.
The main deposit AS 10 1 was discovered at depths of 2374-2492 m. Reservoir replacement zones control the deposit on three sides, and in the south its border is drawn conditionally at a distance of 2 km from the well. 259 and 271. Oil-saturated thicknesses vary from 0.4 (well 237) to 11.8 m (well 265). Debits oil: from 2.9 m 3 /day at Нд =1064 m (well 236) to 6.4 m 3 /day at a 2 mm fitting. The dimensions of the deposit are 38 x 13 km, height up to 120 m, deposit type - lithologically screened.
Deposit AC 10 1 in the area of the well. 420 was discovered at depths of 2480-2496 m. The dimensions of the deposit are 4.5 x 4 km, height - 16 m.
Deposit AC 10 1 in the area of the well. 330 was discovered at depths of 2499-2528 m. The dimensions of the deposit are 6 x 4 km, height - 29 m.
Deposit AC 10 1 in the area of the well. 255 was discovered at depths of 2468-2469 m. The dimensions of the deposit are 4 x 3.2 km.
The section of the AS 10 formation is completed by the AS 10 0 productive formation. Within which three deposits were identified, located in the form of a chain of submeridian strike.
Deposit AC 10 0 in the area of the well. 242 was opened at depths of 2356-2427 m and is lithologically screened. Debits oil are 4.9 - 9 m 3 /day at Hd-1261-1312 m. Oil-saturated thicknesses are 2.8 - 4 m. The dimensions of the deposit are 15 x 4.5 km, height up to 58 m.
Deposit AC 10 0 in the area of the well. 239 discovered at depths of 2370-2433 m. Production rates oil are 2.2 - 6.5 m 3 /day at Hd-1244-1275 m. Oil-saturated thicknesses are 1.6 -2.4 m. The dimensions of the deposit are 9 x 5 km, height up to 63 m.
Deposit AC 10 0 in the area of the well. 180 was opened at depths of 2388-2391 m and is lithologically screened. Oil-saturated thickness - 2.6 m. Inflow oil amounted to 25.9 m 3 /day at Hd-1070 m.
The cover above the AC 10 horizon is represented by a member of clayey rocks, varying from 10 to 60 m from east to west.
Sandy-siltstone rocks of formation AC 9 have a limited distribution and are presented in the form of facies windows, gravitating mainly to the northeastern and eastern sections of the structure, as well as to the southwestern plunge.
AC 9 reservoir in the area of the well. 290 was discovered at depths of 2473-2548 m and is confined to the western part of the field. Oil-saturated thicknesses range from 3.2 to 7.2 m. Flow rates oil are 1.2 - 4.75 m 3 /day at Hd - 1382-1184 m. The size of the deposit is 16.1 x 6 km, height - up to 88 m.
In the east of the field, two small deposits (6 x 3 km) were identified. Oil-saturated thicknesses vary from 0.4 to 6.8 m. Tributaries oil 6 and 5.6 m 3 /day at Hd = 1300-1258 m. The deposits are lithologically screened.
The Neocomian productive deposits are completed by formation AC 7, which has a very mosaic pattern in placement oil-bearing and aquifer fields.
The largest in area, the eastern deposit of the AS 7 layer was discovered at depths of 2291-2382 m. It is contoured on three sides by reservoir replacement zones, and in the south its border is conditional and is drawn along a line running 2 km from wells 271 and 259. The deposit is oriented to the south -west to northeast. Tributaries oil: 4.9 - 6.7 m 3 /day at Hd = 1359-875 m. Oil-saturated thicknesses vary from 0.8 to 7.8 m. The dimensions of the lithologically screened deposit are 46 x 8.5 km, height up to 91 m.
Deposit AC 7 in the area of well. 290 was opened at a depth of 2302-2328 m. Oil-bearing thicknesses are 1.6 - 3 m. In the well. 290 received 5.3 m 3 /day oil at P = 15 MPa. The size of the deposit is 10 x 3.6 km, height - 24 m.
AC 7 deposit in the area of well. 331 was discovered at a depth of 2316-2345 m and is an arched lens-shaped body. Oil-saturated thicknesses vary from 3 to 6 m. In the well. 331 influx received oil 1.5 m 3 /day at Hd = 1511 m. Dimensions of the lithologically screened deposit are 17 x 6.5 km, height - 27 m.
Deposit AC 7 in the area of well. 243 was discovered at a depth of 2254-2304 m. Oil-saturated thickness 2.2-3.6 m. Dimensions 11.5 x 2.8 km, height - 51 m. In the well 243 received oil 1.84 m 3 /day at Nd-1362 m.
Deposit AC 7 in the area of well. 259 was discovered at a depth of 2300 m and represents a lens of sandstones. Oil-saturated thickness 5.0 m. Dimensions 4 x 3 km.
Priobskoye field
|
Name indicators |
Category |
AC 12 3 |
AS 12 1-2 |
AS 12 0 |
AS 11 2-4 |
AC 11 1 |
AS 11 0 |
AS 10 2-3 |
AC 10 1 |
AC 10 0 |
AC 9 |
AC 7 |
|
Initial retrievable reserves, thousand tons |
Sun 1 C 2 |
7737 3502 |
230392 39058 |
26231 1908 |
3725 |
266919 4143 |
1377 |
40981 4484 |
33247 2643 |
1879 5672 |
||
|
Accumulated production,thousand tons |
1006 |
|||||||||||
|
Annual production,thousand tons |
||||||||||||
|
Well stock mining injection |
||||||||||||
|
Scheme drilling |
3-row |
3-row |
3-row |
3-row |
3-row |
3-row |
3-row |
3-row |
3-row |
|||
|
Mesh size |
500*500 |
500*500 |
500*500 |
500*500 |
500*500 |
500*500 |
500*500 |
500*500 |
500*500 |
|||
|
Density wells |
Brief geological and field characteristics of formations
Priobskoye field
|
Options |
Index |
formation |
|||||||||||||
|
Productive reservoir |
AC 12 3 |
AS 12 1-2 |
AS 12 0 |
AS 11 2-4 |
AC 11 1 |
AS 11 0 |
AS 10 2-3 |
AC 10 1 |
AC 10 0 |
AC 9 |
AC 7 |
||||
|
Depth of the formation roof, m |
2620-2802 |
2536-2753 |
2495-2713 |
2464-2667 |
2421-2533 |
2442-2501 |
2393-2721 |
2374-2528 |
2356-2433 |
2393-2548 |
2254-2382 |
||||
|
Absolute elevation of the formation roof, m |
2587-2750 |
2504-2685 |
2460-2680 |
2423-2618 |
2388-2500 |
2400-2459 |
2360-2686 |
2340-2460 |
2322-2400 |
2357-2514 |
2220-2348 |
||||
|
Absolute elevation of OWC, m |
|||||||||||||||
|
Total thickness of the formation, m |
18.8 |
||||||||||||||
|
Effective thickness, m |
11.3 |
10.6 |
|||||||||||||
|
Oil-saturated thickness, m |
2.88 |
4.68 |
1.69 |
1.52 |
4.72 |
3.25 |
1.72 |
2.41 |
2.47 |
||||||
|
Sand content coefficient, fraction, units. |
0.49 |
0.40 |
0.45 |
0.28 |
0.53 |
0.63 |
0.47 |
0.48 |
0.51 |
0.42 |
0.54 |
||||
Petrophysical characteristics of reservoirs
|
Options |
Index |
formation |
|||||||||||||
|
Productive reservoir |
AC 12 3 |
AS 12 1-2 |
AS 12 0 |
AS 11 2-4 |
AC 11 1 |
AS 11 0 |
AS 10 2-3 |
AC 10 1 |
AC 10 0 |
AC 9 |
AC 7 |
||||
|
Carbonate content,% |
min-max average |
3.05 3.05 |
1.9-5.1 |
2.2-5.6 |
1.6-4.6 |
1.3-2.1 |
|||||||||
|
With grain size 0.5-0.25mm |
min-max average |
1.75 |
|||||||||||||
|
with grain size 0.25-0.1 mm |
min-max average |
35.45 |
35.9 |
38.5 |
42.4 |
41.4 |
28.7 |
||||||||
|
with grain size, 0.1-0.01 mm |
min-max average |
53.2 |
51.3 |
48.3 |
46.3 |
42.3 |
60.7 |
||||||||
|
with grain size, 0.01 mm |
min-max average |
11.0 |
10.3 |
15.3 |
|||||||||||
|
Sorting coefficient, |
min-max average |
1.814 |
1.755 |
1.660 |
1.692 |
||||||||||
|
Median grain size, mm |
min-max average |
0.086 |
0.089 |
0.095 |
0.073 |
||||||||||
|
Clay content,% |
|||||||||||||||
|
Type of cement |
clayey, carbonate-clayey, film-pore. |
||||||||||||||
|
Coeff. Open porosity. according to core, fractions of one |
Min-mak average |
0.17 0.16-0.18 |
0.18 0.17-0.19 |
0.18 0.17-0.20 |
0.19 0.18-0.19 |
0.20 0.18-0.22 |
0.18 0.18 |
0.20 0.20-0.22 |
0.17 0.17 |
||||||
|
Coeff. permeability by core, 10 -3 µm 2 |
min-max average |
1.04 1.0-1.05 |
5.41 0.59-20.2 |
4.76 0.57-13.0 |
15.9 4.3-27.0 |
47.0 2.2-87.6 |
2.2 2.2-23.1 |
||||||||
|
Water holding capacity,% |
min-max average |
||||||||||||||
|
Coeff. Open porosity according to GIS, units. |
|||||||||||||||
|
Coeff. Permeability according to GIS, 10 -3 µm 2 |
|||||||||||||||
|
Coeff. Oil saturation according to GIS, share of units |
0.41 |
0.44 |
0.45 |
0.71 |
0.62 |
0.73 |
|||||||||
|
Initial reservoir pressure, mPa |
25.73 |
25.0 |
25.0 |
25.54 |
26.3 |
||||||||||
|
Reservoir temperature, C |
|||||||||||||||
|
Debit oil according to the results of the reconnaissance test. well m3/day |
Min-mak average |
1.0-7.5 |
0.1-26.0 |
2.5-21.6 |
0.4-25.5 |
2.5-118 |
5.94-14.2 |
1.5-58 |
1.64-6.4 |
9-25.9 |
1.2-4.8 |
1.5-6.7 |
|||
|
Productivity, m3/day. mPa |
min-max average |
2.67 |
2.12 |
4.42 |
1.39 |
||||||||||
|
Hydraulic conductivity, 10 -11 m -3 /Pa*sec. |
min-max average |
58.9 |
55.8 |
55.1 |
28.9 |
38.0 |
34.6 |
||||||||
Physico-chemical characteristics oil And gas
|
Options |
Index |
formation |
|
|
Productive reservoir |
AC 12 3 |
AS 11 2-4 |
AC 10 1 |
|
Density oil in superficial Conditions, kg/m3 |
886.0 |
884.0 |
|
|
Density oil in reservoir conditions |
|||
|
Viscosity at surface conditions, mPa.sec |
32.26 |
32.8 |
29.10 |
|
Viscosity in reservoir conditions |
1.57 |
1.41 |
1.75 |
|
Silica gel resins |
7.35 |
7.31 |
|
|
Asphaltene |
2.70 |
2.44 |
2.48 |
|
Sulfur |
1.19 |
1.26 |
1.30 |
|
Paraffin |
2.54 |
2.51 |
2.73 |
|
Pour point oil, C 0 |
|||
|
Temperature saturation oil paraffin, C 0 |
|||
|
Yield of fractions,% |
|||
|
up to 100 C 0 |
|||
|
up to 150 C 0 |
66.8 |
||
|
up to 200 C 0 |
15.1 |
17.0 |
17.5 |
|
up to 250 C 0 |
24.7 |
25.9 |
26.6 |
|
up to 300 C 0 |
38.2 |
39.2 |
|
|
Component composition oil(molar Concentration,%) |
|||
|
Carbonic gas |
0.49 |
0.52 |
0.41 |
|
Nitrogen |
0.25 |
0.32 |
0.22 |
|
Methane |
22.97 |
23.67 |
18.27 |
|
Ethane |
4.07 |
4.21 |
5.18 |
|
Propane |
6.16 |
6.83 |
7.58 |
|
Isobutane |
1.10 |
1.08 |
1.13 |
|
Normal butane |
3.65 |
3.86 |
4.37 |
|
Isopentane |
1.19 |
1.58 |
1.25 |
|
Normal pentane |
2.18 |
2.15 |
2.29 |
|
C6+higher |
57.94 |
55.78 |
59.30 |
|
Molecular mass, kg/mol |
161.3 |
||
|
Saturation pressure, mPa |
6.01 |
||
|
Volume coefficient |
1.198 |
1.238 |
1.209 |
|
Gas factor for conditional separation m 3 /t |
|||
|
Density gas,kg/m3 |
1.242 |
1.279 |
1.275 |
|
Type gas |
|||
|
Component composition oil gas (molar concentration,%) |
|||
|
Nitrogen |
1.43 |
1.45 |
1.26 |
|
Carbonic gas |
0.74 |
0.90 |
0.69 |
|
Methane |
68.46 |
66.79 |
57.79 |
|
Ethane |
11.17 |
1.06 |
15.24 |
|
Propane |
11.90 |
13.01 |
16.42 |
|
Isobutane |
1.26 |
1.26 |
1.54 |
|
Normal butane |
3.24 |
3.50 |
4.72 |
|
Isopentane |
0.49 |
0.67 |
0.65 |
|
Pentane |
0.71 |
0.73 |
0.95 |
|
C6+higher |
0.60 |
0.63 |
0.74 |
Composition and properties of formation waters
|
Aquifer complex |
|||
|
Productive reservoir |
AS 12 0 |
AS 11 0 |
AC 10 1 |
|
Density of water at surface conditions, t/m3 |
|||
|
Mineralization, g/l |
|||
|
Water type |
chlorine-ka- |
facial |
|
|
Chlorine |
9217 |
||
|
Sodium+Potassium |
5667 |
||
|
Kaliya |
|||
|
Magnesium |
|||
|
Hydrocarbonate |
11.38 |
||
|
Iodine |
47.67 |
||
|
Bromine |
|||
|
Bor |
|||
|
Amony |
40.0 |
||
Priobskoye oil field
§1. Priobskoye oil field.
Priobskoe- the largest field in Western Siberia is administratively located in the Khanty-Mansiysk region at a distance of 65 km from Khanty-Mansiysk and 200 km from Nefteyugansk. Divided by the Ob River into two parts - left and right banks. Development of the left bank began in 1988, the right - in 1999. Geological reserves are estimated at 5 billion tons. Proven and recoverable reserves are estimated at 2.4 billion tons. Opened in 1982. Deposits at a depth of 2.3-2.6 km. Oil density 863-868 kg/m3 (medium oil type, as it falls in the range 851-885 kg/m3), moderate paraffin content (2.4-2.5%) and sulfur content 1.2-1 .3% (belongs to the sulfur class, class 2 oil supplied to refineries in accordance with GOST 9965-76). As of the end of 2005, there are 954 production and 376 injection wells in the field. Oil production at the Priobskoye field in 2007 amounted to 40.2 million tons, of which Rosneft - 32.77, and Gazprom Neft - 7.43 million tons. The microelement composition of oil is an important characteristic of this type of raw material and carries various geochemical information about the age of oil, formation conditions, origin and migration routes and finds the most wide application for identifying oil fields, optimizing the field search strategy, separating the products of jointly operated wells.
Table 1. Range and average content of microelements in Priobsk oil (mg/kg)
The initial flow rate of existing oil wells is from 35 tons/day. up to 180 t/day. The location of the wells is clustered. Oil recovery factor 0.35.
A well cluster is a location where the wellheads are located close to each other on the same technological site, and the bottoms of the wells are located at the nodes of the reservoir development grid.
Currently, most production wells are drilled using the cluster method. This is explained by the fact that cluster drilling of fields can significantly reduce the size of the areas occupied by drilling and then production wells, roads, power lines, and pipelines.
This advantage is of particular importance during the construction and operation of wells in fertile lands, in nature reserves, in the tundra, where the disturbed surface layer of the earth is restored after several decades, in swampy areas, which complicate and greatly increase the cost of construction and installation work at drilling and operational facilities. Cluster drilling is also necessary when it is necessary to discover oil deposits under industrial and civil structures, under the bottom of rivers and lakes, under the shelf zone from the shore and overpasses. A special place is occupied by cluster construction of wells in the Tyumen, Tomsk and other regions of Western Siberia, which made it possible to successfully construct oil and gas wells on backfill islands in a remote, swampy and populated region.
The location of wells in a cluster depends on the terrain conditions and the intended means of connecting the cluster to the base. Bushes that are not connected by permanent roads to the base are considered local. In some cases, bushes can be basic when they are located on transport routes. On local pads, wells are usually placed in a fan shape in all directions, which allows you to have the maximum number of wells on a pad.
Drilling and auxiliary equipment is mounted in such a way that when the rig moves from one well to another, the drilling pumps, receiving pits and part of the equipment for cleaning, chemical treatment and preparation of the drilling fluid remain stationary until the completion of the construction of all (or part) of the wells on this pad.
The number of wells in a cluster can vary from 2 to 20-30 or more. Moreover, the more wells in the cluster, the greater the deviation of the faces from the wellheads, the length of the trunks increases, the length of the trunks increases, which leads to an increase in the cost of drilling wells. In addition, there is a danger of trunks meeting. Therefore, there is a need to calculate the required number of wells in a cluster.
The deep pumping method of oil production is a method in which the liquid is lifted from the well to the surface using rod and rodless pumping units various types.
At the Priobskoye field, electric centrifugal pumps are used - a rodless deep-well pump, consisting of a multi-stage (50-600 stages) centrifugal pump located vertically on a common shaft, an electric motor (an asynchronous electric motor filled with dielectric oil) and a protector that serves to protect the electric motor from liquid entering it. The motor is powered via an armored cable, lowered along with the pumping pipes. The rotation speed of the electric motor shaft is about 3000 rpm. The pump is controlled in the surface by a control station. The productivity of an electric centrifugal pump varies from 10 to 1000 m3 of liquid per day with an efficiency of 30-50%.
Electric centrifugal pump installation includes underground and surface equipment.
The installation of a downhole electric centrifugal pump (ESP) has only a control station with a power transformer on the well surface and is characterized by the presence high voltage in a power cable lowered into the well along with the tubing. Electric centrifugal pump installations operate highly productive wells with high reservoir pressure.
The deposit is remote, inaccessible, 80% of the territory is located in the floodplain of the Ob River and is flooded during the flood period. The deposit is distinguished by a complex geological structure - a complex structure of sand bodies in area and section, the layers are hydrodynamically weakly connected. The reservoirs of productive formations are characterized by:
Low permeability;
Low sand content;
Increased clay content;
High dissection.
The Priobskoye field is characterized by a complex structure of productive horizons both in area and in section. The reservoirs of horizons AC10 and AC11 are classified as medium and low productive, and AC12 are classified as abnormally low productive. The geological and physical characteristics of the productive strata of the field indicate the impossibility of developing the field without active influence on its productive strata and without the use of production intensification methods. This is confirmed by the experience of developing the operational section of the left bank part.
The main geological and physical characteristics of the Priobskoye field for assessing the applicability various methods the impacts are:
1) depth of productive formations - 2400-2600 m,
2) the deposits are lithologically screened, the natural regime is elastic, closed,
3) the thickness of layers AS 10, AS 11 and AS 12, respectively, up to 20.6, 42.6 and 40.6 m.
4) initial reservoir pressure - 23.5-25 MPa,
5) reservoir temperature - 88-90°C,
6) low permeability of reservoirs, average values according to the results
7) high lateral and vertical heterogeneity of layers,
8) viscosity of reservoir oil - 1.4-1.6 mPa*s,
9) oil saturation pressure 9-11 MPa,
10) naphthenic oil, paraffinic and low-resin.
Comparing the presented data with the known criteria for the effective use of formation stimulation methods, it can be noted that, even without detailed analysis, from the methods listed above for the Priobskoye field, the following can be excluded: thermal methods and polymer flooding (as a method of displacing oil from formations). Thermal methods are used for deposits with high-viscosity oils and at depths of up to 1500-1700 m. Polymer flooding is preferably used in formations with a permeability of more than 0.1 microns to displace oil with a viscosity of 10 to 100 mPa * s and at temperatures up to 90 ° C (for more high temperatures expensive polymers with special compositions are used).
| ©site | ||
|---|---|---|
| A country | Russia | |
| Region | Khanty-Mansiysk Autonomous Okrug | |
| Location | 65 km from the city of Khanty-Mansiysk and 200 km from the city of Nefteyugansk, floodplain of the Ob River | |
| Oil and gas province | West Siberian oil and gas province | |
| Coordinates | 61°20′00″ n. w. 70°18′50″ E. d. | |
| Mineral resource | Oil | |
| Characteristics of raw materials | Density 863 - 868 kg/m 3 ; Sulfur content 1.2 - 1.3%; Viscosity 1.4 - 1.6 mPa s; Paraffin content 2.4 - 2.5% |
|
| Rank | Unique | |
| Status | Development | |
| Opening | 1982 | |
| Commissioning | 1988 | |
| Subsoil user company | Northern part - LLC RN-Yuganskneftegaz (PJSC NK Rosneft); Southern part - Gazpromneft-Khantos LLC (Gazprom Neft PJSC); Verkhne-Shapshinsky and Sredne-Shapshinsky license areas - OJSC NAK AKI OTYR (PJSC NK RussNeft) |
|
| Geological reserves | 5 billion tons of oil | |
Priobskoye oil field– a giant Russian oil field located on the territory of the Khanty-Mansiysk Autonomous Okrug. Considered the most large deposit in Russia by current reserves and level of oil production.
General information
The Priobskoye field belongs to the West Siberian oil and gas province. It is located on the border of the Salym and Lyaminsky oil and gas regions, 65 km from the city of Khanty-Mansiysk and 200 km from the city of Nefteyugansk, and is confined to the local structure of the Middle Ob oil and gas region of the same name.
About 80% of the field area is located in the floodplain of the Ob River, which, crossing the site, divides it into 2 parts: the left and right banks. Officially, the areas of the left and right banks of the Ob are called the Yuzhno- and North-Priobskoye fields, respectively. During flood periods, the floodplain is regularly flooded, which, along with the complex geological structure, allows us to characterize the deposit as difficult to access.
Reserves
Geological reserves of the field are estimated at 5 billion tons of oil. Hydrocarbon deposits were discovered at a depth of 2.3-2.6 km, the thickness of the layers reaches from 2 to 40 meters.
The oil from the Priobskoye field is low-resinous, with a paraffin content of 2.4-2.5%. They are characterized by an average density (863-868 kg/m³), but a high sulfur content (1.2-1.3%), which requires additional purification. Oil viscosity is about 1.4-1.6 mPa*s.
Opening
The Priobskoye deposit was discovered in 1982 by well No. 151 of Glavtyumengeologiya.
Operational oil production began in 1988 on the left bank from well No. 181-R using the flow method. The right bank began to be developed later – in 1999.
Development
Currently, the development of the northern part of the Priobskoye oil field (SLT) is carried out by RN-Yuganskneftegaz LLC, owned by Rosneft, and the southern part (YULT) by Gazpromneft-Khantos LLC ( subsidiary company PJSC Gazprom Neft).
In addition, in the south of the field there are relatively small Verkhne-Shapshinsky and Sredne-Shapshinsky license areas, which have been developed since 2008 by OJSC NAC AKI OTYR, owned by PJSC NK RussNeft.
Development Methods
Due to the specific conditions of occurrence of hydrocarbons and the geographical location of deposits, production at Priobskoye oil field produced using hydraulic fracturing, which significantly reduces operating costs and capital investment.
In November 2016, the largest hydraulic fracturing of an oil reservoir in Russia was carried out at the field - 864 tons of proppant were pumped into the reservoir. The operation was carried out jointly with specialists from Newco Well Service.
Current production level
The Priobskoye field is rightfully considered the largest oil field in Russia in terms of reserves and production volumes. To date, about 1,000 production wells and almost 400 injection wells have been drilled there.
In 2016, the field provided 5% of all oil production in Russia, and in the first five months of 2017, more than 10 million tons of oil were produced from it.
