Method of oil deposit development using flooding. RU patent 2504646.
 System for heavy oil and natural bitumen deposit arrangement (versions) / 2503806According to the 1st version the system includes fresh water source with fresh water pipeline, productive wells connected via product pipeline to oil preparation station equipped with marketable oil pipeline and pipeline of concurrently extracted water, connected to the waste treatment facilities that are connected to injection wells via fresh water pipeline, cluster pump station and water conduit fitted with corrosion inhibitor dosing unit. Well product pipeline is equipped with de-emulsifying agent dosing unit, waste treatment facilities are fitted with trapped oil pipeline for its return to oil preparation station, additionally equipped with product heating system with fuel gas pipeline and associated petroleum gas pipeline, and second purified water pipeline connected to water preparation unit for supply of concurrently extracted water to fine purification at oil extraction volume more than 10% from design maximum volume of oil extraction with purified water pipeline disconnection. Note that water preparation unit is connected to fresh water pipeline for its fine treatment for provision of steam generator by necessary water volume, as well as to cluster pumping station via brine pipeline and finely treated water pipeline with steam generator that is for water heating is connected to fuel gas pipeline and via steam pipe it is connected to the steam-injection wells. According to the 2nd version productive wells are connected via well product pipeline and booster pump station to oil preparation unit. |
 Method for inter-well fluid pumping / 2503805Method includes packer installation above the production well bed, oil-water emulsion extraction from below-packer space by pump, descended at tube string, emulsion separation to oil and water in down-hole conditions, oil extraction from top part of above-packer annular space to oil pipeline, extraction of formation water and its pumping via water pipeline through injection wells into oil bed with undeveloped oil resources. Pump operation is provided in constant mode, oil-water emulsion is supplied through radial holes in tube string into above-packer annular space, where oil-water emulsion is separated. Water is extracted from above-packer annular space via subsidiary tube, the inlet of which is located below the level of water-oil contact, and its outlet is connected to the water pipeline fitted with flow metre. Oil extraction is additionally performed from tube string into oil pipeline, which is fitted with flow regulator and is connected to the subsidiary tube via bypass line, connected to the oil pipeline after flow regulator for water discharging into it at water pipeline repair works. |
 Method for maintaining formation pressure and device for its implementation / 2503804Invention includes pumping of cluster pumping station fluid equipped with inlet and discharge water conduit through comb unit and injection wells into the formation in cyclic mode with regular stop of cluster pumping station operation. In the period of low outside temperatures at cluster pumping station stop there performed is a cluster controller adjusted by flow direction and volume fluid discharge from injection wells with close reservoir properties through discharge water conduit and bypass line into inlet water conduit or process tank. Fluid discharge volume is made with provision of multiple replacement of water in wellhead zones of injection wells. Device includes cluster pump station with inlet and discharge water conduits with flow metre, comb unit, connected to discharge water conduit of cluster pump station and water conduits of injection wells fitted with shut-off valves, and cluster controller connected to shut-off valves control units. Note that inlet water conduit and discharge water conduit between flow metre and cluster pumping station are connected via bypass line to adjusted by hydraulic resistance, equipped with process tank and shut-off-control valves made in the form of adjustable valve gates mounted capable of opening and closing of cross-flows from bypass line into inlet water conduit or process tank, as well as for closing bypass line at switching on, cluster pumping station. Note that the flow metre is connected to the communication channel about flow direction and fluid volume with cluster controller. |
 Water flooding method of oil deposits / 2499885Method involves water pumping to a productive formation with simultaneous wave action. According to the invention, at development of floating oil deposits with production wells with horizontal shafts crossing definitely oriented vertical planes of fracturing, injection horizontal wells are located at the level of oil-water contact (OWC) or below it in water-bearing parts of the formation. With that, horizontal shafts of injection wells intersect the planes of vertical fracturing as production wells. Temporary shutters or liquid filtration controls are installed in production wells at fracturing intervals, and wave emitters at those intervals are installed in injection wells perforated at fracturing intervals. Uniform lifting of OWC with displacement of oil to horizontal shafts of production wells is provided by means of wave action. |
 Oil-well sucker-rod pumping unit for water pumping to stratum / 2498058Oil-well sucker-rod pumping unit for water pumping to stratum includes packer installed upwards stratum, tubing string with pressure control valves and suction valves. Plunger pump with cylinder run-in at tubing-string is installed upwards valves. Suction valve is connected to space over the packer. Rod stripper is equipped with lubrication tank. Tubular annulus of the well is connected to water supply pipeline. Plunger is equipped additionally with device for forced downstroke. Downwards pressure control valve there's an auxiliary pressure control valve connected to space below the packer and output of this valve is done through isolating device. Device for forced downstroke of the piston can be made as loads or pneumatic accumulator connected to piston. Working cavity of pneumatic accumulator is the upper part of tubing string. Technical results provides expanding of application scope of the unit in injection wells with pumping under high pressure, improving operation reliability due to improving operation reliability of suction and pressure control valves. |
| Development method of oil deposits using formation hydraulic fracturing / 2496976 Method involves construction of injection and production wells, carrying-out of directional hydraulic fracturings so that hydraulic connection is provided, pumping of displacement agent to injection wells so that uniform front of high pressure is provided in rows of injection wells, and takeoff of fluid from production wells. With that, directional hydraulic fracturings are performed only in rows of injection wells. In production wells there made is an analysis of the product flooding rate, as per which flooding maps are built and configuration of front of oil displacement with water is determined. Besides, in different injection wells arranged in rows there changed are volumes of pumped displacement agent to provide uniform high-pressure front. |
 System of cluster water pumping to formation / 2494238System of cluster water pumping to a formation includes a cluster pump station, a unit of a comb with gate valves, water conduits, gate valves arranged in a wellhead zone of injection wells, flow metres installed on the comb unit and/or in the wellhead zone of injection wells, the operation of which is provided at different working pressures with stops of the cluster pump station, a cluster controller with an information transfer channel from flow metres to the cluster controller, which has the possibility of opening and closing gate valves on the unit of combs and/or gate valves arranged in the wellhead zone of injection wells. According to the invention, cluster controller is equipped with a programmed interval timer having the possibility of sending opening or closing signals of gate valves to exclude freezing in a water conduit at minimum water flow velocity at stop of cluster pump station with the interval and duration of the opening, which are determined by empirical method depending on ambient temperature, diameter of water conduits, their heat insulation and composition of liquid in them for periodic pumping of one to three water volumes in the same water conduit. |
| Development method of oil deposit by water-flooding / 2494237 At development of an oil deposit by means of thermal water-flooding, inter-well pumping of formation water is performed from a below-lying formation to an above-lying productive formation and extraction of formation product is performed through production wells from productive formation. At inter-well pumping, water is extracted from the formation with temperature exceeding the productive formation temperature not less than by 20°C and with mineralisation of formation water, which is higher than mineralisation of water in productive formation not less than by 56 g/l; inter-well pumping is started at oil development stage, when formation pressure is decreased, and development is performed in formation pressure rise mode. Injection is performed in a cyclic mode. |
| Oil deposit development method / 2494236 During development of oil deposit the oil is extracted through production wells and working agent is pumped through injection wells. Production wells operated by bottom-hole pumps are changed over from operation conditions with constant extraction to operation conditions with constant bottom-hole pressure. Injection wells with non-express circulation behind the string or crossflows are defined. The defined injection wells are started for pumping in periodic mode with discrete water flow to a formation with variation from maximum possible flow to 0. Duration of operation of production wells changed over to operation conditions with constant bottom-hole pressure is controlled. At increase of duration of operation of production wells, injection rate is determined as per increasing formation pressure. At positive injection rate injection wells with non-express circulation behind the string or crossflows are put into operation without any repair, and production wells are continued to be operated under operation conditions with constant bottom-hole pressure. |
| Method of oil filed development / 2493362 Method involves oil sampling through producer wells and working agent pumping through pressure wells. According to the invention, the formation parameters are specified. For this purpose, the formations having ±20% equal porosity, gross sand, clay content and net thickness are specified in the interwell space as shown by current oil saturation charts or according to seismic exploration findings. The non-draining sites, stagnation zones and deposit course of the formations having the same characteristics are detected. A model of oil field development is changed. For this purpose, producer and pressure wells are further drilled on the formations for self-management, or the existing producer and pressure wells on the formations are further perforated, while those are preferentially the formations that are developed. |
 Method of treating bottom zone of injecting wells / 2244113Groups 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 / 2247230Method 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) / 2254457According 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) / 2259473Method 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 / 2259474Method 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 / 2260686Method 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 / 2264533Method 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 / 2265120Method 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 / 2265716Method 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. |
FIELD: oil-and-gas industry.
SUBSTANCE: injection wells and horizontal extracting wells are drilled, heat carrier is injected via injection wells and oil is extracted through production wells. Horizontal well is drilled above the water-oil surface (WOS) while vertical well is drilled at least 50 m from horizontal well bottom. Pool is exposed another time in vertical well above and below horizontal well. Pipe string is downed in injection well to set packer in place between openings. Displacement agent is injected via top opening and pipe space while bottom opening - via pipe string.
EFFECT: higher efficiency of oil displacement, increased oil extraction, higher extraction rate.
1 ex, 1 dwg
The invention relates to the oil industry and may be used in development of oil deposits with the waterflooding.
There is a method of development of deposits of high-viscosity oil (patent RU №2434127, IPC 21 43/24, publ. Bul. №32 from 20.11.2011,), including the drilling of vertical injection and production of horizontal wells, injection of heat carrier through injection wells, selection of products through production horizontal wells. horizontal producing well Buryat with the use of one of the whipstock near the soles of the reservoir, and vertical injection wells-with the location of the slaughter over the middle part of the horizontal section of the production well at a distance, excluding breakthrough coolant, while the reservoir is conventionally divided into several zones with different temperature regimes, while pumping the heat carrier as the warm formation and achieving marginal water cut in production wells selection starts with the lower, more heated zone, after reaching the product temperature 80-90% of temperature breakthrough selection transferred into a zone of lower temperatures, insulating zone with high temperature close to the temperature breakthrough, deaf packers, when the temperature in the new areas of zone selection selection is moved to a cooler area with truncation of high temperature zones deaf packers, and when the temperature drops to reduce the yield strength below the required values zone selection transferred into the zones with higher temperatures below 70% temperature breakthrough, and retrieve packers.
Disadvantages of the method are the complexity of the construction horizontal wells, increase of expenses on the construction of wells for the organization of exposure to heat.
Closest to the technical nature and the achieved result is a way of development of deposits of heavy oil or bitumen (patent RU №2334095, IPC 21 43/24, publ. Bul. №26 of 20.09.2008,), including the drilling of vertical injection wells and horizontal wells, injection of the agent through injection wells and oil withdrawal through production wells. Horizontal wellbore production well spend 1.5-2.5 m above the sole of the productive formation, horizontal wellbore perforate, above the horizontal wellbore production well 3.5 to 4.5 m placed bottom of a vertical injection wells, punched in the range of 0.5-1.5 m from the bottom, vertical injection well placed from the vertical shaft of the production well at a distance of greater than 2/3 of the length of the horizontal section of the production well, until the end of the horizontal wellbore, as operating agent steam used in alternation with the air.
The main disadvantage of this method is the low efficiency of the process of replacement of oil due to uneven heating of the reservoir over the entire time interval horizontal wellbore agent of influence.
The technical objectives of the present invention is to increase oil recovery, increase of efficiency of process of replacement of oil by injection of the agent above and below position of a trajectory bottom horizontal wellbore production well.
The technical problem is solved by a method the development of oil deposits with the waterflooding, including the drilling of vertical injection and production of horizontal wells, injection displacing agent through injection wells, selection of products through production horizontal wells.
What is new is that horizontal well Buryat above the level of the oil-water contact (KSS), and vertical - at least 50 m from the face of the horizontal well, produce secondary opening of deposits in the vertical well above and below the horizontal wells, it is sent to the injection well column pipes with setting a packer between , pump displacement agent through the top opening of the space, and through the bottom opening - the pillar of pipes.
The essence of the invention.
In the proposed method solved the problem of the increase of oil displacement efficiency, to increase oil recovery, increase the tempo of the selection, increasing the coverage of impacts on the area and vertical.
On the drawing the circuit of realization of the proposed method for the development of oil deposits in the late stage of development, where
1 - plot oil deposits; 2 - horizontal producing wells; 3 - vertical injection well; 4 - water contact (KSS); 5,5 1 - perforation intervals; 6 - a column of pump-compressor pipes (NKT); 7 - packer.
The method is carried out in the following sequence.
The deposits of oil 1 in the productive formation above the level of VNK 4 Buryat at least one horizontal producing well 2, through which later is selection of products. At a distance of not less than 50 m from the face of the horizontal well 2 carry out the construction of vertical injection wells 3. In an injection well 3 cement annulus, produce secondary opening of deposits with the formation of perforations 5,5 1 above and below position of a trajectory bottom horizontal wellbore production well 2, it is sent to the injection well 3 column tubing with setting a packer 7 between 5,5 1 in order to avoid overflows displacing agent.
For smoothing injectivity profile have pumped water isolation ended in the delivery chink of 3, for example, polyacrylamide, crushing into the reservoir to the extent necessary to partial isolation of water inflow from water-bearing part of the productive strata of the Deposit of 1. The volume equal to the volume of the wellbore at a pressure in not more than 2-3 MPa. For this, use or centrifugal pump trucks, providing pressure on 0.6-1.0 MPa, or mobile pumping unit. Pressure should be controlled by two gauges on 5-10 MPa installed on and wellhead.
Next to the injection well 3 serves displacement agent through the top opening of 5 space, and through the bottom opening 5 1 of the column pipes 6, allowing you to adjust the front flooding above and below the production well 2, achieving a uniform displacement front. The volume of displacing agent is determined by calculation, and is 2 m 2 per 1 ton of produced oil. As displacing agent use water or heated reagent depending on the type of collector and intervals viscosity of the productive formation. Regulation of pumping and pumping pressure of the pumped agent will significantly improve the efficiency of the process of displacement of oil to the trunk of the production well 2.
Then carry out the selection of products.
An example of a specific implementation.
Develop oil Deposit with 1 terrigenous collector. The deposits of a highly productive area in the thickness of 30-40 m with a temperature of 25 degrees, pressure 13 MPa, saturation 0,93 D. units, porosity 26%, permeability 0,82 microns 2 , density of oil 911 kg/m3 and viscosity 56 MPa·C.
The deposits of oil 1 in the productive formation above the level of KSS at 12 meters drilled one horizontal producing well 2 300 meters long, about 80 m from the face of the horizontal well 2 drilled a vertical injection wells) 3. In an injection well 3 annulus, produced secondary opening of 5 deposits with the formation of perforations 5 above and below the position of a trajectory bottom horizontal wellbore production well 2. Next to the injection well 3 lowered column tubing with setting a packer 7 between 5, 5 1 in order to avoid overflows displacing agent. Download displacement agent through the top opening of 5 space, and through the bottom opening 5 1 - column pipes 6.
Next to align profile pick-injection of produced water isolation ended in the delivery chink 3 in an amount equal to 3 m 3 .
Next to the injection well 3 filed displacement agent in the amount of 9.5 m 3 . As displacing agent used water. After which carried out the selection of products.
Exploitation of the section is intended to reach the designed oil 0,5. While developing the entire range of coverage increases the influence of the reservoir, oil recovery has increased by 15%, additional oil production for the entire period of operation of the site amounted to 122 thousand tons of oil.
Application of the proposed method will allow to increase oil recovery, oil recovery rate, increase the coverage of the layer effects.
Way of development of oil deposits with the waterflooding, including the drilling of vertical injection and production of horizontal wells, injection displacing agent through injection wells, selection of products through production horizontal wells, wherein the horizontal well Buryat above the level of the oil-water contact - KSS, and vertical - at least 50 m from the face of the horizontal well, produce secondary opening of deposits in a vertical well above and below the horizontal wells, it is sent to the injection well column pipes with setting a packer between , pump displacement agent through the top opening of the space, and through the bottom opening - the pillar of pipes.