Method for oil deposit development at late stage. RU patent 2506418.
 Development method of high-viscosity oil deposit / 2506417Invention refers to oil producing industry. In development method of high-viscosity oil deposit that includes drilling of vertical injection wells and horizontal directional producers, pumping of operating fluid through injection wells and oil withdrawal through producers, determination of oil-water contact (OWC) level the horizontal directional producer is drilled from mouth to downhole at the level at least per 2-3 m higher than OWC level; vertical injection well is drilled so that its downhole is located over producer downhole per 5-8 m. The producer is perforated along it hole length while the vertical injection well is perforated in the stratum area in direction towards the producer mouth. Stage by stage as operating fluid breaks through or water cut exceeds 95% downhole of the horizontal directional producer is cut off above the breakthrough or watercut area and the area of injection well penetration is cut off from below per 1/3 - 1/2 of its whole length. When production of the production area is completed the mouth of horizontal directional producer is placed under pressure of operating fluid. |
 Method of developing oil pool using horizontal multibranch wells / 2505668Method consists in drilling vertical pressure wells and horizontal producers, in pumping heat carrier through pressure wells, and in withdrawal of production via horizontal producers. Producers are made as multibranch horizontal wells which are drilled upwards oil-water contact, and vertical wells are made at distance not less than 50 m from bottoms of multibranch horizontal wells. Opening of vertical well deposits is made again upwards and downwards of respective bottom of horizontal well, casing string is landed to each injection well and packer is set between openings, displacement agent is pumped through the upper opening into tubular annulus and through the lower opening into casing string. |
 Assembly for development of wells with low-permeable beds with use of hydraulic jet pumps and pressure pulse generators / 2503803Assembly includes shank, packer, return valve, hydraulic jet pump. According to invention the assembly additionally includes second hydraulic jet pump and pressure pulse generator, the latter of which is mounted at the interval between hydraulic jet pumps and is capable of operation under the influence of working fluid pumped by tubing string. Note that pressure pulse generator has turbine stages - stators with holes and rotors with gates capable of regular closing of holes in stators that are fixed against turning relatively each other, like rotors, for sudden changing of stream velocity through hydraulic jet pumps. |
 Method for oil and gas well cleaning in productive formation area and device for its implementation / 2503796Method for oil and gas well cleaning in productive formation area consists in location of hydro-pulse device at pipe string at the zone of productive formation with formation of annular space. Pumping of flushing fluid at direct and reverse flushing of the well with flushing fluid annular circulation through pumping unit. Hydro-pulse influence and active fluid pumping into the formation by converting the downstream in pipes' cavities into the pulsing upstream in annular space. Elimination of colmatant from formation by multiple automatic alternation of hydro-pulse and momentary depressive effect on productive formation zone. Device for oil and gas well cleaning contains hollow casing with ring lug and conical surface. Cross-beam with axial channel connected to bush and interacting with casing ring lug. Bush and disk valve with axial channel spring-loaded by one spring. Pusher with top projection. Nut located on pusher cylindrical surface of large diameter capable of fixed movement. |
 Method and system for production of hydrocarbons from hydrate formation using blowdown gas / 2502863Production method of hydrocarbons from a hydrate formation containing hydrocarbons involves the following stages: provision of a production well interconnected with production equipment and hydrate formation containing hydrocarbons and interconnected with free space above hydrate formation and containing dissociated hydrocarbons and water; and b) passage of blowdown gas through free space for removal of dissociated hydrocarbons and water from hydrate formation and transportation of dissociated hydrocarbons and water to the production well. |
 Method for combined production and processing of hydrocarbons from natural gas hydrate manifolds and common hydrocarbon manifolds (versions), and system for its implementation / 2502862Production method of hydrocarbons from many hydrocarbon manifolds involves the following: production of the first mixture of water and hydrocarbons including at least oil and/or natural gas at least from one common hydrocarbon manifold and transportation of the first mixture to a collection station including a water separator for processing of the first mixture of water and hydrocarbons; simultaneous production of the second mixture of water and natural gas at least from one natural gas hydrate manifold and transportation of the second mixture to the collection station for processing of the second mixture of water and natural gas; and processing of the first and the second mixtures using the collection station at least for partial separation of water and hydrocarbons from the first and the second mixtures. |
 Development method of oil deposit located above gas deposit and separated with non-permeable interlayer from it / 2502861Method involves drilling of vertical and horizontal production and injection wells in oil deposit, pumping of working fluid to injection wells and extraction of products from production wells. Drilling of an additional horizontal well in gas deposit is performed; then, branches directed upwards through a non-permeable interlayer with outlet of branches to oil deposit are drilled out of it. Water is pumped from the head to the additional horizontal well so that gas-water mixture is formed in the same well. At gas leakage to shafts of production wells, product extraction from the same wells is reduced by 40-50% till bottomhole pressure in them is recovered. After that, product extraction from the same wells in previous volume is continued. |
 Installation for water-alternated-gas injection to oil formation / 2500883Installation includes centrifugal pump for operating liquid pumping without gas, run-down lines for basin and liquid, two tanks with air inlet valves and pressure control valves located in the upper line, bleed-off lines and liquid pressure lines located in the lower parts and symmetrical high-pressure and low-pressure taps communicating with discharge and suction of the pump. According to invention at water input line in parallel to the main centrifugal pump there is an additional pump which discharge side communicates with operating nozzle of liquid-gas ejector, receiving chamber of the latter is connected to gas line and discharge is connected to upper parts of tanks. At the line of liquid input to ejector there is regulating valve and choke connected in series. Gate of the regulating valve is connected hydraulically to discharge of ejector and input to choke. |
 Method of development of oil pool located above gas pool and separated therefrom by impermeable parting / 2499134Proposed method comprises drilling of vertical and horizontal production and injection wells, injection of working agent in injection wells and oil extraction from production wells. Additional horizontal wall is drilled to penetrate through impermeable seam between oil and gas pools. Then, branches are drilled from horizontal borehole directed upward to terminate to oil pool and downward to gas pool. Now, hydraulic fracture is performed in horizontal well in interval of impermeable section to form hydraulic fractures to communicate oil and gas pools. In operation, fixed extraction of products is performed in production wells at oil pool. At penetration of gas into production wells, viscous fluid is objected in extra horizontal well to eliminate gas ingress in said well. |
 Method of natural gas extraction from hydrocarbon hydrates with simultaneous retention of carbon dioxide in subsurface formation / 2498057Method involves the following stages: carbon dioxide gas is supplied to deposits of methane hydrates; action of carbon dioxide gas is provided to methane hydrate with methane release and accumulation of carbon dioxide gas in the form of carbon dioxide hydrates; released methane is removed. At that carbon dioxide gas is supplied as carbon dioxide gas in supercritical state under pressure more than 7.4 MPa and stored at temperature more than 31.48°C. |
 Method for intensifying oil extraction / 2244106Method includes electro-hydraulic treatment of bed at resonance frequency and extraction of oil from bed. According to invention bed is excited by resilient pulses at broad frequency range from 0 to 10 kHz. Frequencies are set, at which bed is treated. Resonance frequency is kept by singular, periodical, radially focused electro-hydraulic pulses with generation frequency, divisible by bed resonance frequency. Concurrently in adjacent well bed excitation frequency is controlled by resilient pulses and corrected according to measurements results. |
 Method of joined development of oil and potassium deposits / 2244107Invention comprises following scheme. Oil is produced from producing wells. Potassium salts are extracted from mines and processed. Solutions are pumped into deep lying porous rock formations preliminarily revealed between oil-bearing and potassium formations. Those porous rock formations are chosen which are located below underlying stone salt. Pumping of solutions is effected through injecting wells until pressure drop in oil-bearing formation is compensated to a value sufficient to prevent deformation in potassium formations, this value being calculated using special math formula. Oil formation is then run while maintaining compensating pressure in chosen porous formation. |
| Method of treating bottom zone of well / 2244108 When treating well bottom zone, the latter is exposed to magnetostriction action under conditions of 50% depression of formation pressure. Magnetostriction action is carried out from the roof to the subface of formation including stepwise treatment of each linear meter for 2.5-3.5 h. |
| Method of treating bottom zone of well / 2244109 When treating well bottom zone, a reagent, in particular water-oil emulsion with up to 30% water and with surfactant additives, among them nonionic components, is pumped into formation. Number of electric discharge pulses is set basing on real porosity of formation taking into consideration empiric dependence of the number of electric discharge pulses per 1 m of formation on the porosity of rocks, which dependence was preliminarily obtained on core material. Pulse treatment of bottom zone of well is effected in a reagent medium with electric discharges from electric-discharge machine, which is displaced and periodically fixed for treating a local area of well bottom zone. |
 Method for extracting oil and gas deposit / 2244807Method includes pumping of replacing agent through force wells. Cyclic vibro-seismic treatment with alternating frequencies is performed on bed, using ground vibration sources. Composition and amount of extracted fluid is determined after and before treatment. Dominating frequencies of bed are detected on basis of reaction of micro-seismic noise thereof on vibro-seismic treatment. Additional vibro-seismic treatment is performed by signal being a total of at least two monochromatic signals with frequencies equal to dominating frequencies of block of productive oil deposit bed. Treatment is performed till development of cracks, while placing blocks in resonance oscillations, and separating of inner potential energy, providing for intensification of processes of forming of clusters in extensive zone from blocks of productive bed having different sizes. |
 Method for treatment of face-adjacent well area / 2244808Method includes lowering assemblage with brushes on tubing column into perforation interval. Interval is filled with chemically active environment. By driving tubing column, assemblages are rotated and concurrently reciprocally displaced. Inter-tubular space is separated above perforation range. Bed is drained with forming of sign-alternating liquid displacement in perforation interval and weak depression pulses. Washing out of treatment products is performed by pumping out reaction products with dirt through apertures in the brush. |
 Method for extraction of oil deposit / 2247828Method includes pumping working agent into wells of force rows and/or locked force blocks, extraction of liquid and gas from extraction wells, separation of force and product wells on portions and groups and physical effect on productive beds, in particular change of direction of filtering flows. Prior determination of relative remainder extracted oil deposits in productive bed is provided along watered product wells and portion as a whole. Calculation of adapted, on basis of parameters of oil displacement in whole portion, oil saturation level in product of liquid for values of relative remainder oil resources in each product well. Than product wells are singled out, in which actual oil level is not less than adapted for relative remainder oil resources of this well. These wells together with water-less wells are left in constant operation in mode of maximal liquid extraction. Remaining extraction wells as well as force wells are enabled in periodical operation in groups. At the same time in one semi-cycle a group of force wells is enabled in operation in mode of minimal working agent volume pumping mode, and product wells being in area of effect of these - in mode of maximal liquid extraction, or vice versa. In following semi-cycle modes of operation of product and force wells are swapped with opposite ones. Grouping of product wells and modes of their operation are corrected in accordance to changes of relative remainder extracted oil resources, actual and adapted oil level in wells in time. |
 Method for heat-wave processing of bed / 2249683Method includes concurrent heat and wave processing of bed. Said effect is performed by feeding heat carrier into bed through pressure oscillations generator, mounted in force or extracting wells. Wave effect is performed with value of oscillations frequency, which are determined from analytical dependencies. |
 Method for controlling extraction of oil deposit / 2254455Method includes taking oil from product wells, forcing water into force wells, maintaining face pressure at product wells higher than oil pressure of gas saturation, and at force wells - lower than pressure of bed hydraulic fracturing. Well operation technological modes are measured, pressure restoration curves are taken, filtering parameters of bed are determined. According to invention for each of wells, with consideration of their interference, partial derivative of total deposit oil debit is determined on basis of face pressure. Then by utilizing partial derivative of total oil debit on basis of face pressure graph of total oil extraction is built dependent from totals of absolute values of depression and repression. On basis of characteristic bend on the graph optimal mode of technological effect on deposit is determined and realized. |
| Method for extraction of water-clogged oil deposit / 2255212 Method includes determining dominating frequency of productive bed by performing prior vibration-seismic action using surface oscillations source at different frequencies and analysis of seismic graphs from seismic receivers in product wells. Vibration-seismic effect on watered portion of productive bed of oil deposit is performed by a group of surface oscillations sources, operating at dominating frequency of productive bed. Bed fluid is extracted via product wells. After vibration-seismic effect on watered portion of productive bed of oil deposit by a group of surface oscillations sources, operating at domination frequency of productive bed, concurrent vibration-seismic effect is performed using two sub-groups of said group of surface oscillation sources. Each sub-group of group operates at determined from mathematical dependence. Average frequency of surface oscillations sources of whole group is equal to dominating frequency of productive bed. Difference in frequencies, on which each sub-group operates, is determined in accordance to linear size of watered portion of productive bed of oil deposit and is satisfactory to mathematical dependence. Concurrent vibration-seismic effect by two sub-groups of said group of surface oscillations sources is performed with forming of wave having length exceeding length of wave with dominating frequency. |
FIELD: oil and gas industry.
SUBSTANCE: invention is related to oil industry and can be applied in development of oil pool with different type of reservoirs. The concept of the invention is as follows: method consists in drilling vertical pressure wells and horizontal producers, in pumping displacement agent through pressure wells, and in withdrawal of production via horizontal producers. At that the horizontal well is drilled above water-oil contact (OWC) level and the vertical one - at distance of at least 50 m from bottom hole of the horizontal well. Completion of deposit in the vertical well is made above and below of the horizontal producer. Completion in the vertical well above horizontal borehole is made with bigger density of penetrated holes than during completion below horizontal borehole in order to create more even flood front.
EFFECT: method provides improving of oil recovery and efficiency in oil displacement.
1 dwg, 1 ex
The invention relates to the oil industry and may be used in development of oil deposits in the late stages of development.
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 productive formation 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 areas of high temperature close to 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 high-viscosity oil (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 of development of oil deposits in the late stage of development, 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, and secondary opening of the vertical well above the horizontal wellbore produce higher density of developing holes than opening below the horizontal wellbore to create a more uniform flood front.
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 - section of the oil deposits; 2 - horizontal producing wells; 3 - vertical injection well; 4 - water contact (KSS); 5,5 1 - perforation intervals, 6 - 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 and secondary opening of 5 vertical wells 3 above horizontal wellbore 2 produce higher density of developing holes 5 at least twice what the autopsy 5 1 below the horizontal wellbore 3 to create a more uniform flood front. Because the top part of the reservoir, as a rule, with marginal reservoir properties remains imperfect penetration due to the large filtration resistance bottomhole oil comes with a low speed and small quantities. As a result of works well with small tempo of the selection. Therefore, exploitation of deposits becomes inefficient, with significant residual oil-thickness of the reservoir. Therefore, such a showdown contributes to a more rapid progression of displacing agent to the trunk of the production well 2.
Between intervals opening avoid overflow is pumped agent set packer 6.
Next to align injectivity profile have pumped water isolation ended in the delivery chink 3, 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 in the volume determined by calculation, and of 2 m 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. Then carry out the selection of products.
Specific example of the
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. The upper interval of perforations 5 placed at the level of 3 m from the roof of the stratum with a frequency of holes 1 m, and the lower interval perforations 5 1 placed at the level of 5 m from the sole of the productive strata of the Deposit with a frequency of 1 perforations 3 meters between the intervals Between the opening set packer 6. Next to align profile pick-made injection of polyacrylamide in the delivery chink 3 in an amount equal to 2.7 m 3 .
Next to the injection well 3 serves displacement agent in the amount of 9,2 m as displacing agent use water. Then carry out the selection of products.
Thanks to the application of the proposed method of development of oil deposits in the late stage of oil recovery rate increases from 3 to 9% of recoverable reserves.
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 126 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 in the late stage of development, 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 the vertical well above and below the horizontal wells, and secondary opening of the vertical well above the horizontal wellbore produce higher density of developing holes than opening below the horizontal wellbore to create a more uniform flood front.