Oil deposit development method

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to the oil-producing industry, in particular to oil field development with flooding. According to the method the displacement agent is injected and oil is withdrawn through the system of injection and production wells. The flooding mode is changed during the development. The displacement agent is injected into the injection well in intensive mode. Using the surface measuring instruments that are a part of an automated process control system the change of extracted oil volume growth depending on the displacement agent injection volume growth until the moment of fast drop of the extracted oil volume is monitored in real time. Then the displacement agent injection volume after which the named drop occurred is recorded. Further injection into the injection well is performed in the volume below this pre-set value.

EFFECT: decrease of labour input of control of oil field flooding process during injection of the displacement agent into injection wells.

1 ex, 6 dwg

 

The invention relates to the oil industry, to methods of development of oil deposits with the use of waterflooding.

A method of developing oil deposits, including the injection of the displacing agent and the selection of products through a system of injection and production wells, which alter the flooding system in the process of development from less intensive to more intensive depending on the water cut multiple shift from the selected initial waterflood in other types of water-flooding system (Pat. Of the Russian Federation No. 1724858, prior. 21.01.1990 G., publ. 07.04.1992 G.).

The known method involves the initial geophysical and hydrodynamic studies of wells drillable oil reservoir to determine reservoir properties to consider when choosing waterflood.

The disadvantage of this method is the complexity of the method.

The known method of development of flooded oil reservoir (patent RF №2230896, Appl. 25.02.2003, publ. 20.06.2004, IPC EV 43/20), which according to the authors allows to control the degree of water content of products produced by the method of equalizing reservoir pressure between the aquifer and the oil-bearing reservoir zones by controlling the volume of injection wells and the amount of selection in operational�.

The disadvantage of this method is that as a factor affecting the degree of water content of produced fluids, was chosen as the reservoir pressure difference between the aquifer and the oil-bearing zones, to assess quickly which is not always possible, especially in production wells, which require rather time-consuming measurements with special downhole equipment either by registration recovery curves pressure ("Hydrodynamic studies of wells". R. S. Khisamov, I. E. Suleymanov, R. K. Eskew, etc., Moscow, VNIIOENG, 1999, 227 PP.), which takes a lot of time.

The object of the invention is to reduce the complexity of control over the process of flooding the oil reservoir in the injection of the displacing agent in injection wells.

The consequence of this timely control is to establish the time of breakthrough of injection water to the faces of producing wells and further regulation of the volume of injection in injection wells.

This problem is solved in that in the method of development of oil deposits containing injection of the displacing agent and the selection of oil through a system of injection and production wells, the change in the flooding regime in the development process, produce the injection of the displacing agent in injection wells in intensity: high�nom mode, while using ground-based measurement tools are included in the automated system of technological process control, real time monitor the changes of growth of oil production, depending on the growth in the volume of injection of the displacing agent until a sharp decline of oil production, then record the volume of injection of the displacing agent in which occurred the specified slump, and further pumping to the injection well produces in volume is below this set value.

Fig. 1 is a diagram of a five-point cell location of the injection well 1 and production wells 2, 3, 4, 5.

Fig. 2 gives the dynamics of the volume of oil produced (QHand the companion volume of water (QB) from the volume pumped into injection well 1 water (QZackin a producing well 2.

Fig. 3 gives the dynamics of the volume of oil produced (QHand the companion volume of water (QB) from the volume pumped into injection well 1 water (QZackin a producing well 3.

Fig. 4 gives the dynamics of the volume of oil produced (QHand the companion volume of water (QB) from the volume pumped into injection well 1 water (QZackin a producing well 5.

Fig. 5 gives the dynamics of the volume of extracted n�PTI (Q Hand the companion volume of water (QB) from the volume pumped into injection well 1 water (QZackin a producing well 4.

Fig. 6 shows the configuration of the front oil displacement since the increase in QZack.

Curve (a) corresponds to the uniform distribution of the front oil displacement at QZack=Qmax.

Curve (b) corresponds to the beginning of the uneven distribution of the front oil displacement at QZack>Qmaxin the direction of wells 3 and 4.

Curve (b) corresponds to an uneven distribution of the front oil displacement at QZack>>Qmaxin the direction of wells 3 and 4.

In real conditions to control the flow rate of injected and extracted products is not difficult, because almost all wells are equipped with ground sensors, included in commercial computerized system ACS TP (automated control system of technological process that allows you to monitor these parameters in real time.

Analysis of field studies shown in Fig. 2-5, showed that on producing wells 2 and 5 (Fig. 2 and Fig. 4) growth in selected oil (QH) and a concomitant drop in the volume of water (QB), and wells 3 and 4 (Fig. 3 and Fig. 5) there is extreme dependence between p�the parameters, when the growth of the volume of water injection (QZackin injection well 1 first observed the growth of oil produced, and then decline, after reaching a maximum value of QZack=Qmaxwhile the pattern of change in the volume of associated water (QB) has an opposite character ("mirrored") (Fig. 3 and Fig. 5).

Experimental studies have shown that the observed wells 3 and 4, the extreme dependence explains the reasons for the existence of tehnogennogo fracturing caused by the excess volume of injection (QB) above the permitted level, which led to the abrupt manifestation of the anisotropy of the permeability of the rocks, forming a selected area.

Of rock mechanics it is known (A. I. Spivak, A. N. Popov. Rock mechanics. M., Nedra, 1975 and P. M. Usachev. Hydraulic fracturing. Moscow, Nedra, 1986) that after the occurrence of a hydraulic fracture, if again to reset the discharge pressure, it will crack closure, and the permeability of the formation will again become isotropic. Thus, the process of opening and closing of the crack is reversible. In the case where the crack opening want to keep, then it is pumped propping material, a proppant, and then after pressure relief the crack opening remains.

In affect�, the effect of heterogeneity in the permeability of the rocks, forming a plot of oil production, the nature of the acceleration (QZack), which should be taken into account during the selection of the mode of injection of water into an injection well.

On the basis of obtained results it can be concluded that the volume of injection (QZack) on areas of the field, confirmed man-made hydraulic fractures, caused by the excess of its volume, and its corresponding pressure injection above the permitted level should be kept below a value that causes the manifestation of the anisotropy of the permeability of the object injection, leading to the appearance of man-made hydraulic fracturing.

When implementing the claimed method produced water injection well in an intensive mode with monitoring of changes in growth of oil production, depending on the growth of the volume of water injection to the moment of the sharp decline of oil production, then record the volume of water injection, in which occurred the specified slump, and further injection of water into this area produces in volume is below this set value.

In this mode of discharge of water does not occur of its breakthrough along the axes of anisotropy of permeability of the reservoir, in the zone which are production wells, thereby reducing the water-cut.

P�the imera of the method is experimentally obtained dependence on wells 3 and 4 (Fig. 3 and Fig. 5), in which there is an extreme correlation between the growth of the volume of water injection (QZackin injection well 1 and the initial growth of oil produced (QH) to the maximum value, and then decline after reaching the maximum value of QZack=Qmaxwhile the pattern of change in the volume of associated water (QB) has an opposite character ("mirrored") (Fig. 3 and Fig. 5).

The sharp decline of oil produced due to the phenomenon tehnogennogo fracturing caused by the excess amount of injection QZackabove the permitted level, which led to the abrupt manifestation of the anisotropy of the permeability of the rocks, forming the selected parcel on which are located wells 3 and 4.

Fig. 6 shows the configuration of the front oil displacement since the increase in QZack.

Curve (a) corresponds to the uniform distribution of the front oil displacement at QZack=Qmax.

Curve (b) corresponds to the beginning of the uneven distribution of the front oil displacement at QZack>Qmaxin the direction of wells 3 and 4.

Curve (b) corresponds to increasing uneven distribution of the front oil displacement at QZack>>Qmaxin the direction of wells 3 and 4.

Dynamics of changes in the configuration of the displacement front oil� reflects the manifestation of the anisotropy of the reservoir in the direction of wells 3 and 4 since the increase of the volume of injected water is higher than the permissible calling technogenic fracturing, which leads to the increase of water content in oil, which is characterized by a curve (QB) in Fig. 3 and Fig. 5.

Method of oil pool development containing injection of the displacing agent and the selection of oil through a system of injection and production wells, the change in the flooding regime in the development process, characterized in that they inject the displacing agent in injection well in an intensive mode, with a ground-based measurement tools are included in the automated system of technological process control, real time monitor the changes of growth of oil production, depending on the growth in the volume of injection of the displacing agent until a sharp decline of oil production, then record the volume of injection of the displacing agent in which occurred the specified slump, and further pumping to the injection well produces in volume is below this set value.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method provides for use of the production wells. One or several wells are equipped with pump unit with possibility of discharge change. For each production well the deposit or deposits used for production are known. At wellhead of each production well the produced crude oil and oil gas are measured, as well as crude oil watercut is determined. The product wells product is delivered to the gathering header of the wells cluster. The cluster contains one or more injection wells. For each injection well the deposit or deposits used for injection are known. Injectability of the injected water and required injection pressure are determined. Compatibility of the injected water and produced water is studied. Injection is performed upon compatibility of the injected and produced waters. Coordinates of all production and injection wells of the cluster using the same deposits are determined. For each production well time of the produced product lifting is determined from suction of the pump unit to wellhead at maximum discharge. Volume of produced crude oil and oil gas is measured with interval not exceeding half of measured time of fluid lifting for the given well. At wellhead of each well the injected water pressure and its volume are measured. Injected water volume and wellhead pressure are measured with interval not exceeding half of measured time of water supply to the wellhead of each injection well before parker. For each injection well the curve of injected water pressure and volume vs. time is plotted. For each production well using the plotted volume of produced crude oil and oil gas vs. time the relationship with the injected water volume and wellhead pressure is determined, as well as distances to each injection well ensuring injection to the same deposit. For the production wells equipped with pump units with possibility of discharge change such relationships are determined at different discharge. The wells cluster is controlled based on the obtained relationships for all production wells. At that the treated water supply system for injection is made with possibility to change water volume and wellhead pressure for one or more injection wells.

EFFECT: increased efficiency of clusters well control.

2 cl, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: this process comprises measurement of injection well capacity, feed of products of one or several production wells for preliminary water disposal. Measured are density of green oil and gas, green oil water content are measured in the well. Here said products are divided into partially dewatered oil, gas and water. Partially dewatered oil and gas are fed in gathering main. Disposed water is fed into injection well. Compatibility of disposed water with water of seam wherefrom pumping from injection well is made is defined. If threes are compatible, injection well is equipped with the device to create water pressure sufficient for water injection into seam, for example, with electrically-driven rotary pump. Said device allows varying of feed capacity by frequency-controlled drive for said pump. It is set to minimum feed to define the compliance of disposed water quality with the seam geological properties. At poor water quality, it is directed to gathering main or, at sufficient quality, it is forced into injection well. Disposed water amount is defined. Then, device feed capacity is increased either continuously or in stepwise manner to create water pressure. It is increased unless disposed water quality satisfied the seam geological properties.

EFFECT: higher process efficiency.

3 cl, 1 dwg, 1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: this device comprises hollow case with cover that has working fluid feed channels and bottom with discharge channel that features cross-section larger than that of working fluid feed channel for communication case inside with well bottom zone, moving working member that makes with said case the working chambers. Said working member is shaped to truncated ellipse fitted on the case at antifriction bearing and composed of axle with relationship between arms of top and bottom ends equal to 1:2. Aforesaid working member has the channel to communicate working chamber, antifriction bearing with the case bottom discharge channel. Nozzle is arranged under said bottom with communicating discharge channel and radial equal-cross-section area. Total cross-section area of said holes equals that of discharge channel. Cover bottom surface and bottom upper surface are composed of cylinder generatrix to allow displacement of working member top and bottom arms there over and isolation of working chambers.

EFFECT: higher efficiency of stationary pulse injection of fluid.

2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: method comprises cyclic decrease and increase of pressure in a formation by pumping of water through injection wells and oil withdrawal through production wells. Into the formation through injection wells the mineralised water is pumped periodically in the volume of 0.1-5 of pore volume of the formation and fresh water in the volume of 0.1-5 of pore volume of the formation. The transition to fresh water pumping after mineralised water pumping is performed without gradual decrease in mineralisation. The structure and concentration of salts of the pumped mineralised water are remained at the level of the formation one. The cycle of pumping of waters with different mineralisation is repeated many times. Fresh water is pumped until the moment when decrease of intake capacity of the injection well exceeds the allowable production level - critical drop of reservoir pressure in target impact areas. The mineralised water is pumped until the moment when the injection well sets to initial or close to initial operating mode which depends from the flow rate of the injected liquid and well head pressure.

EFFECT: increase of oil recovery of formations due to increase of their coverage.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method comprises run in the production well below fluid level of the pipes string with pumps, and with filters installed at pipe ends, product recovery from top production deposit, oil and water separation in the wellbore, water injection to the bottom deposit, oil lifting to surface. Two filters are run to well on separated pipe strings. Filters are pipes with capillary holes with diameter 2 mm max, and density 50 holes/m min. One filter has hydrophobic surface with hydrophobic degree 99% min, the another filter has hydrophilic surface with hydrophilic degree 99% min. Parker is installed above the top deposit to seal the annulus. Filters are made with length not below the bottom deposit roof. Filter with hydrophilic surface is made with large length then the filter with hydrophobic surface such that the parker installed between the production string and filter with hydrophilic surface will be above the bottom deposit roof, and end of the filter with hydrophobic surface will be above this parker. The parker does not permit the fluid from the top deposit flow to the bottom deposit via the annulus. Moving from the top production deposit to the wellbore the fluid enters the annulus, where it is filtered via the capillary holes of the appropriate filters with hydrophobic and hydrophilic coatings separating to oil, that entering via the filter with hydrophobic surface in the pipes string by the pump is lifted to surface, and to water that entering via the filter with hydrophilic surface in the another pipes string by the pump is pumped in the bottom deposit.

EFFECT: increased efficiency of oil and water separation in the wellbore, increased efficiency of waterflooding and increased oil recovery of the deposit.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method comprises run in the production well of the pipes string with filter below liquid level in well, product recovery from top deposit, oil and water separation in the wellbore, water injection to bottom deposit, oil lifting to surface. The filter is pipe in pipe, the internal pipe has hydrophilic surface with hydrophilic degree 99% min, capillary holes with diameter 2 mm min, and density 50 holes/m min. Outside pipe has hydrophobic surface with hydrophilic degree 99% min, capillary holes with diameter 2 mm max, and density 50 holes/m min. Pipes string diameter used for filter run is equal to diameter on internal filter pipe. Internal pipe has length exceeding length of outside pipe. Outside pipe is located not below the top deposit, and internal pipe - not below bottom deposit. Between the casing string and bottom of the outside pipe above the top deposit the parker is installed, ensuring fluid from top deposit ingress directly in space between the internal and outside pipes of the filter. Between the casing string and bottom of the internal pipe above the bottom deposit the parker is installed also, excluding fluid from bottom deposit ingress in space between the internal and outside pipes of the filter. Moving from top production deposit to the wellbore the fluid enters the space between the internal and outside pipes of the filter, where it is filtered via the capillary holes of the appropriate filter pipes with hydrophobic and hydrophilic coatings, separating to oil that entering in the outside pipe and then in annulus by the pump is lifted to surface, and to water that entering in the internal pipe by the pump is pumped in the bottom deposit.

EFFECT: increased efficiency of oil and water separation in the wellbore, increased efficiency of waterflooding and increased oil recovery of the deposit.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: system includes a group pumping station with a pump feeding water line with a pressure sensor, a water discharge line of the pump, a valve manifold, a system of distributing water lines downstream the pump with flow meters, shut-off and control valves, low-permeable injectors with return valves and high-permeable injectors. At that the system operates in a cyclic mode with cycles of pressure increase and decrease in the feeding water line. The high-permeable injectors are equipped with spring-operated flow controllers. At the water line feeding the pump there is a pressure controller bound with a bypass line with a flow controller and automatic gate. This gate is coupled functionally with a cluster controller. It ensures the collection of data from the flow meters and pressure sensor with the analysis of the performed task against pressure injected through the distributing water lines. The automatic gate is made so that at the r signal of the controller it provides the water flow through the bypass line in order to compensate water injection to the low-permeable injectors at the total deficiency in the injection volume to them.

EFFECT: excluding deficiency in the injection volume to the low-permeable injectors and pressure balancing in feeding water lines.

1 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: reservoir pressure maintenance system includes a water supply source, pumps, low-pressure water lines connecting the pump of the water supply source to booster pumps of injectors, which wellheads are equipped with shut-off and regulating valves. At that the low-pressure water lines are under maximum permissible pressure that exceeds the maximum permissible pressure at the input of the respective booster pump; the lines are equipped with pressure regulators. These pressure regulators ensure reduction of pressure at the input of the respective booster pump in the operation process up to a value lower that the maximum permissible pressure but not lower that the minimum permissible pressure for this pump. The pressure regulators are operating as downstream pressure controllers during limitation of the injection volume to one or several injectors or during their complete shut-down. The booster pump is designed for the input pressure as per the following formula.

EFFECT: improved reliability of the pumps operation and increase of their life between overhauls.

1 tbl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method a deposit is drilled out by wells as per the wide well spacing pattern. Deposits are surveyed with the determination of their hypsometric depths. New wells are constructed and offshoots or horizontal offshoots are drilled from the existing wells towards the maximum oil saturation of the deposit. At that a seismic survey is performed with the determination of several oil-saturated zones in the deposit with advanced permeability and porosity both in the square area and altitude of the reservoir. Availability and position of fault lines is defined additionally. New horizontal or inclined wells are constructed as per an irregular pattern so that horizontal or inclined section of these wells passes through the selected oil-saturated zone with the maximum filtering area. Construction of offshoots or horizontal offshoots from the existing wells is made towards the closest oil-saturated zone so that they pass the maximum filtering area upon drowning of the wells or reduction of the oil flow rate below the profitable value. The offshoots or horizontal offshoots pass through the zone with the effective oil-saturated thickness of at least 10 m when water-bearing reservoirs are available in the stratum foot, or at least 4 m when the water-bearing reservoirs are not available in the stratum foot. The inclined offshoots or horizontal offshoots pass through the oil-saturated zone perpendicular or at an acute angle towards the deposit fault line at the distance that allows the prevention of fast drowning of the extracted product.

EFFECT: higher efficiency of development for a less explored oil deposit.

2 cl, 1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: system of cluster water injection to reservoir contains the cluster pump station, block-regulating valves, pump, line for water supply to pump, water flowline connecting pump and manifold, system of distributing water lines with branches to each injection to high, medium and low intake wells. Branches of medium intake wells are equipped with calibrated unions. The cluster pump station ensures the cyclic operation mode with periodic pressure increasing or decreasing in the supply water line. The supply water line is equipped with pressure regulator to reduce or to increase pressure at pump inlet if appropriate pressure exceeds or reduces below the pressure set-point in the supply water line. The pressure set-point is pre-selected based on the pump characteristic. Additionally the pump is equipped with the variable frequency drive. The water flowline is equipped with the pressure transmitter connected with pump VFD to maintain pre pre-selected optimal pressure by the pump in the water flowline. At that branches of the high intake wells are equipped with the appropriate flow regulators to ensure permanent volume of water injection.

EFFECT: minimisation of water overinjection to the injection wells of same intake, and exclusion of water underinjection to the injection wells of other intake upon optimisation of the power consumption for water injection in the system of cluster water injection to the reservoir, and pressure stabilisation in water lines.

1 dwg, 2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: 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.

EFFECT: higher oil yield, higher effectiveness.

5 cl, 3 dwg

FIELD: oil extractive industry.

SUBSTANCE: 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.

EFFECT: higher efficiency.

1 ex

FIELD: oil industry.

SUBSTANCE: 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.

EFFECT: higher efficiency.

2 cl, 2 dwg

FIELD: oil reservoir development, particularly for developing water-flooded ones.

SUBSTANCE: 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.

EFFECT: possibility to retain oil relative permeability of oil-saturated formation area.

2 cl, 2 dwg

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

FIELD: oil industry.

SUBSTANCE: 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.

EFFECT: higher oil yield.

1 ex, 1 dwg

FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: 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.

EFFECT: increased efficiency, oil recovery and production well injectivity, as well as increased sweep efficiency and oil recovery ratio.

1 dwg

FIELD: oil production industry, particularly oil deposit development.

SUBSTANCE: 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.

EFFECT: increased efficiency of oil bed development due to energy-saving equipment and technique usage for formation pressure maintaining.

2 cl, 2 dwg

FIELD: enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: 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.

EFFECT: increased operational reliability.

1 ex, 3 dwg

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