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IPC classes for russian patent Nonuniform oil field development method (RU 2259474):
Another patents in same IPC classes:
 Water-flooded reservoir development method (variants) / 2259473
Method involves withdrawing oil through production wells and ejecting working substance through ejection wells. To prevent water ingress from well bore into oil-saturated formation area formation is perforated in water-oil interface zone so that lower part of oil-saturation formation interval and upper part of water-flooded formation interval are penetrated. This provides oil relative permeability retention in oil-saturated formation area. To prevent formation mudding during initial perforation thereof drilling is performed in depression, balance and repression modes with pressure of not more than 3 MPa. As far as oil is depleted perforation interval is extended towards oil-saturated formation area.
 Oil deposit extraction method (variants) / 2254457
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Method for extraction of oil deposit / 2247829
Method includes drilling of deposit according to row-wise non-even grid of wells with distance from force to extractive rows, greater than distance between extractive rows, pumping of displacing gent into force wells, extraction of product from product wells and transferring of displacing agent pumping front to extraction area. According to invention, transferring of displacing agent pumping front to extraction area is performed by drilling side horizontal shafts in all wells of force row and directed towards extractive row by beds ad zones with most remainder oil saturation level. Then among these wells are singled out, horizontal shafts of which pass along beds and areas with lesser oil saturation level. Pumping of displacing agent is restarted, and other wells are transferred to product category. These wells are operated with face pressures lower than saturation pressure until reaching 98% water saturation level. After that pumping of displacing agent is restarted along all other wells of force row. During that, rows of extractive wells are operated in normal mode.
 Oil deposit extraction method / 2247230
Method includes construction of wells and oil and gas collection system, forcing water from water-bearing level into oil deposits, flow of oil from oil deposits into secondary deposit and following extraction of oil from secondary deposit for useful implementation. Resources of deposit are separated on basis of natural energy characteristic on screened and having rigid water-forcing mode. Deposit is operated by three well types. Of the latter flow wells connect oil deposits to secondary deposit for flowing and collection of oil in upper bed under effect from gravitation. Balancing wells connect screened deposits and secondary deposit to water-forcing level for balancing of bed pressures and preventing loss of rocks stability. Extraction wells connect secondary deposit to oil and gas collection system. Selection of bed for secondary deposit is performed from number of highly penetrable beds, having maximally allowed excess over oil deposits.
 Method of treating bottom zone of injecting wells / 2244113
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Method of treating bottom zone of injecting wells / 2244113
Groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.
Oil deposit extraction method / 2247230
Method includes construction of wells and oil and gas collection system, forcing water from water-bearing level into oil deposits, flow of oil from oil deposits into secondary deposit and following extraction of oil from secondary deposit for useful implementation. Resources of deposit are separated on basis of natural energy characteristic on screened and having rigid water-forcing mode. Deposit is operated by three well types. Of the latter flow wells connect oil deposits to secondary deposit for flowing and collection of oil in upper bed under effect from gravitation. Balancing wells connect screened deposits and secondary deposit to water-forcing level for balancing of bed pressures and preventing loss of rocks stability. Extraction wells connect secondary deposit to oil and gas collection system. Selection of bed for secondary deposit is performed from number of highly penetrable beds, having maximally allowed excess over oil deposits.
Method for extraction of oil deposit / 2247829
Method includes drilling of deposit according to row-wise non-even grid of wells with distance from force to extractive rows, greater than distance between extractive rows, pumping of displacing gent into force wells, extraction of product from product wells and transferring of displacing agent pumping front to extraction area. According to invention, transferring of displacing agent pumping front to extraction area is performed by drilling side horizontal shafts in all wells of force row and directed towards extractive row by beds ad zones with most remainder oil saturation level. Then among these wells are singled out, horizontal shafts of which pass along beds and areas with lesser oil saturation level. Pumping of displacing agent is restarted, and other wells are transferred to product category. These wells are operated with face pressures lower than saturation pressure until reaching 98% water saturation level. After that pumping of displacing agent is restarted along all other wells of force row. During that, rows of extractive wells are operated in normal mode.
Oil deposit extraction method (variants) / 2254457
According to first variant of method, force and product wells are drilled, working agent is fed through force wells, oil is extracted through product wells, dome-like raised portions are marked out, which surpass absolute marks of bed, additional wells are positioned in these portions. Wells placement is planned at tops of dome-like raised portions even with breach of evenness of planned well mesh. After full drilling of wells mesh and in case of more accurate definition according to data of drilled wells of deposit of dome-like portions side shafts are drilled from adjacent wells towards more precisely defined tops of dome-like portions, controlling the deposit. In adjacent wells and side shafts, positioned on tops of dome-like raised portions , range of productive bed is opened between absolute mark of ceiling in this well and absolute mark, appropriate for ceiling in closest well. According to second variant of method practically analogical operations are realized as in first variant, except when absolute mark of ceiling of productive bed according to adjacent wells is lower than mark of sole of productive bed, whole bed is opened in side shafts.
Water-flooded reservoir development method (variants) / 2259473
Method involves withdrawing oil through production wells and ejecting working substance through ejection wells. To prevent water ingress from well bore into oil-saturated formation area formation is perforated in water-oil interface zone so that lower part of oil-saturation formation interval and upper part of water-flooded formation interval are penetrated. This provides oil relative permeability retention in oil-saturated formation area. To prevent formation mudding during initial perforation thereof drilling is performed in depression, balance and repression modes with pressure of not more than 3 MPa. As far as oil is depleted perforation interval is extended towards oil-saturated formation area.
 Nonuniform oil field development method / 2259474
Method involves drilling injection and production wells; flooding oil reservoir and extracting oil out of well; defining more exactly geologic aspects on the base of drilling results; designing and drilling additional wells with horizontal bores or drilling horizontal bores from existent wells; determining location of reservoir drive zone boundaries; calculating volume of dead oil located near drive zones; drilling horizontal bores from existent wells located near drive zones and/or new wells with horizontal bores located in above zone, wherein horizontal bores are drilled in direction perpendicular to drive zone boundaries.
 Method for extraction of oil deposit / 2260686
Method includes drilling vertical product and force wells, extracting oil from product wells, forcing working agent through force wells, making side horizontal shafts in force wells, forcing working agent through side horizontal shafts of force wells. Additionally, side horizontal shafts are made in extraction wells. Oil is taken through side horizontal shafts of extractive wells. With pressure in the well, decreased for 5-10% from hydrostatic pressure, all side horizontal shafts are made by washing away rock under pressure of fluid of around 15-20 mPa. Direction of all side horizontal shafts is set to be parallel to rows of wells.
 Method for oil reservoir development in carbonate or terrigenous formation with developed macrocracks / 2264533
Method involves drilling production and injection wells and maintaining formation pressure; performing seismic works to determine volumetric routing of natural macrocrack system with lateral and depth routing; forming production and injection macrocracks of above system; drilling wells to corresponding macrocracks and forming producing well-macrocrack systems for oil production and injection well-macrocrack for formation flooding or production well-macrocrack for oil production and system including vertical and/or horizontal multibranch wells for formation flooding or injection well-macrocrack system for formation flooding and system including vertical and/or horizontal multibranch production wells for oil production or production well-macrocrack system, injection well-macrocrack system and system including vertical and/or horizontal multibranch production and injection wells.
 Oil-bearing bed development method and equipment for group pumping station with oil deposit zone / 2265120
Method involves pumping working agent, namely water, in two stages. The first stage is performed with the use of power pumps. The second one is carried out by means of hydraulic measuring pumps, which are used to convert injection pressure created by power pumps. If it is necessary to increase pressure in water lines used to deliver water to separate injection wells pressure is regulated in accordance with necessary water volume to be injected in wells on the base of collecting properties of oil formations in bottomhole formation zones. This is performed by providing change in pump piston diameter and stroke ratios in the first and the second sections of hydraulic measuring pumps, which are selected on the base of hydraulic resistance variation depending on water flow velocity. Parameters characterizing injection system operation are simultaneously measured and efficiency of the method and equipment operation is detected from above characteristics.
 Injection well operation optimization method / 2265716
Method involves flooding production bed through injection wells with the use of pump units. In the case of terrigenous porous productive bed flooding acoustical sound resonators with resonance frequency setting are installed in injection line. This eliminates amplitude of alternating low-frequency liquid pulsation sound generated by pump units. Method also involves providing constant compression mode in productive beds and frontal oil drive from productive bed.
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FIELD: oil field development, particularly for ones with nonuniform reservoirs.
SUBSTANCE: method involves drilling injection and production wells; flooding oil reservoir and extracting oil out of well; defining more exactly geologic aspects on the base of drilling results; designing and drilling additional wells with horizontal bores or drilling horizontal bores from existent wells; determining location of reservoir drive zone boundaries; calculating volume of dead oil located near drive zones; drilling horizontal bores from existent wells located near drive zones and/or new wells with horizontal bores located in above zone, wherein horizontal bores are drilled in direction perpendicular to drive zone boundaries.
EFFECT: improved oil recovery.
2 dwg, 1 ex
The proposed method relates to the field of oil field development, presents a heterogeneous reservoirs.
There is a method of developing oil fields with heterogeneous reservoirs by drilling project the number of injection and production wells, flooding and extraction of oil on the surface, followed by the drilling of some small number of producing wells, taking into account the heterogeneity of the reservoir (Migemo. "Geological framework of the development of oil fields". M.: Nedra, 1975).
The disadvantage of this method is the low oil recovery associated with incomplete sweep efficiency due to the ignorance of the heterogeneity of the reservoir and saturating fluids at the initial design stage.
The closest in technical essence to the present invention is a method of developing a heterogeneous oil fields, including drilling injection and production of vertical and horizontal wells, the flooding of the reservoir and removing the oil on the surface, the refinement of the geological structure of the drilling and modeling and drilling additional wells with lateral or horizontal wells from old wells (see RF patent №2101475, IPC E 21 In 43/20, BI No. 1, 1998).
The disadvantage of this method is the incomplete coverage of the layers of the plant is the group because of the impossibility of extraction of oil, located along the borders of zones of substitution collectors.
The technical objective of the proposed method is to increase oil recovery by engaging in the development of stagnant zones of oil along the borders of zones of substitution collectors.
This task is achieved by the described method of mining heterogeneous oil fields, including drilling injection and production wells, the flooding of the reservoir and removing the oil on the surface, the refinement of the geological structure of the drilling and modeling and drilling additional wells with lateral or horizontal wells from old wells.
It is new that determine the location of boundaries of zones substitution collectors, additionally calculate the quantity of fixed oil, concentrated near the borders of zones of substitution collectors, then carry out the drilling of horizontal wells with old wells located near the borders of zones of replacement of sewers and/or new wells with a horizontal shaft in this area, and horizontal trunks Buryats in the direction perpendicular to the boundary of substitution.
Known scientific-technical and patent sources is not known use of the proposed essential features that perform a similar task.
The drawing presents the Jena layout on the site of the Deposit project wells and horizontal wells from old wells (b), uncovered residual zone of oil in the oil reservoir, located along the border zones of substitution.
The inventive method is carried out in the following sequence.
Field razvarivat project wells, carry out its infrastructure. Have pumped water injection and oil production from producing wells. During operation measure oil and water. Clarify the geological structure and oil using the parameters of the layers after the resulting drilling project wells. Clarify the boundaries of the zones substitution collectors. After reaching a period of declining production determine the recoverable reserves using the displacement characteristics. Comparing reserves, estimated using the volumetric method and displacement parameters determine the presence and quantity of fixed oil, concentrated near areas replacement of headers.
The additional drilling of horizontal wells and/or horizontal wells in the direction of the zones substitution allows us to Refine the boundaries of these zones, therefore, the oil reserves near them. Enter these horizontal wells can be entered into the development of additional oil reserves, located near the zones of substitution.
Place new wells with lateral and/or horizontal trunks with old SK is Agin, located near the borders of zones of substitution collectors so that horizontal wellbore in a productive part was drilled in a direction perpendicular to the boundary of substitution collectors. In the process, due to the formation of additional pressure gradient in the stagnant zones there is a movement previously fixed oil to these wells. This leads to increased oil recovery.
Specific example
The mine has rasberry design grid (figa 1, 2), made his arrangement. Produced water injection into injection 1 and the extraction of oil from production wells 2. Took measurements of oil production and water injection. Built lithological map and has estimated reserves of oil, determined by the displacement characteristics of recoverable reserves. At site - 2145 gg geological and 1072 tons of recoverable reserves. In this area significant areas (about 30%) was not a collector. Produced 600 tons of oil. Production watercut reached 50%. Conducted a simulation plot using mathematical models of two-phase filtration in a two-dimensional region. Identified areas of lowest pressure gradients. Determined the location of the boundaries of zones substitution collectors. Determined that stagnant zones are formed along the border zone of substitution collectorof. Wells located in the immediate vicinity of the zones substitution collectors drilled horizontal trunks 3, directed perpendicular to the boundary zones substitution collectors (figb). Put them in production. Identified recoverable reserves using the displacement characteristics. Recoverable reserves increased by 20% and amounted to 3200 tons, against 2604 tons, specific to horizontal drilling. Additional production will be 525 gg economic value of this additional crude oil will be (when the price of oil is $ 3500 per tone) 1,8375 billion rubles (over 30 years). Additional costs for sidetracking 4 will be 24 million rubles, the operating costs of the extraction of additional crude oil will be, when the production costs of oil production 2 thousand rubles per ton:
525000·2000=1050 million rubles
Savings for the entire period of work will be
1837,5-1050=787,5 million rubles
Average annual economic effect will be 26,25 million rubles, 1 well - 6.56 mln rubles
The way to develop heterogeneous oil fields, including drilling injection and production wells, the flooding of the reservoir and removing the oil on the surface, the refinement of the geological structure of the drilling and modeling and drilling additional wells with lateral or horizontal with the oxen from old wells, characterized in that to determine the location of boundaries of zones substitution collectors, additionally calculate the quantity of fixed oil, concentrated near areas of replacement collectors, then carry out the drilling of horizontal wells from old wells located near the borders of zones of replacement of sewers and/or new wells with a horizontal shaft in this area, and horizontal trunks Buryats in the direction perpendicular to the boundary of substitution.
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