CN112240194A - Multi-stage oil-water separation and same-well injection-production method in horizontal shaft - Google Patents
Multi-stage oil-water separation and same-well injection-production method in horizontal shaft Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 249
- 238000000926 separation method Methods 0.000 title claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000002347 injection Methods 0.000 claims abstract description 206
- 239000007924 injection Substances 0.000 claims abstract description 206
- 239000007788 liquid Substances 0.000 claims abstract description 140
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000004581 coalescence Methods 0.000 claims abstract description 28
- 230000035699 permeability Effects 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims description 39
- 238000005065 mining Methods 0.000 claims description 37
- 239000012530 fluid Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 10
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- 238000003860 storage Methods 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 129
- 238000011161 development Methods 0.000 abstract description 5
- 239000010779 crude oil Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000010865 sewage Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 13
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- 230000009471 action Effects 0.000 description 4
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- 230000004048 modification Effects 0.000 description 1
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- 239000003129 oil well Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/066—Valve arrangements for boreholes or wells in wells electrically actuated
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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Abstract
A multi-stage oil-water separation and same-well injection-production method in a horizontal shaft. The problem of low crude oil extraction rate caused by uneven oil content in different areas in the development process of the horizontal well is mainly solved. The method comprises the following steps: space improvement in a conventional horizontal shaft is realized, and a multi-stage same-well injection and production section is applied to horizontal well production, so that multi-stage oil-water separation in the well is realized; the recovery-injection annulus packer is used for realizing the displacement of the same-well reinjection liquid after the separation of the low oil-bearing zone to the high oil-bearing zone, so that the perforation permeability of the high oil-bearing zone is enhanced; meanwhile, a conventional swirler in the same-well injection and production process is upgraded into a double-cone coalescence swirler, so that the coalescence process from small oil drops to large oil drops is realized, and the oil-water separation efficiency is enhanced. The invention utilizes the displacement of the reinjection liquid of the low oil-bearing area to improve the perforation permeability of the high oil-bearing area and reduce the lifting of the water-bearing produced liquid and the treatment cost of the ground sewage.
Description
Technical Field
The invention belongs to the technical field of oil reservoir development, and particularly relates to an oil-water separation and same-well injection-production method in a horizontal shaft.
Background
In the development process of the oil reservoir development technology, the horizontal well exploitation technology is increasingly widely applied, but in recent years, the horizontal well exploitation also faces the problem of high water content of produced liquid, the contact area of the horizontal well and the stratum is large, the penetration of the oil reservoir is long, the oil reservoir is unevenly distributed, and the imbalance of the oil extraction efficiency in a single well is easily caused. The co-well injection and production technology is a development process capable of realizing integration of water injection and oil production in a single well, is more suitable for realizing oil-water separation in the well to reduce water content of produced liquid, and has less research on co-well injection and production of horizontal wells at present. In particular, in recent years, the exploitation of oil field strata such as sandstone reservoirs and shale reservoirs is vigorously developed to drive the exploitation of horizontal wells to be further developed, and the problems are increasingly serious.
Disclosure of Invention
The invention provides a method for multi-stage oil-water separation and same-well injection and production in a horizontal shaft, which can realize the independent work of multi-stage same-well injection and production sections in the horizontal shaft, and can simultaneously utilize the design installation of related parts and the corresponding underground working environment to coordinate the work among different same-well injection and production sections, realize the reinjection liquid after the separation of a low oil-bearing zone and displace the high oil-bearing zone, thereby enhancing the function of the perforation permeability of the high oil-bearing zone
The technical scheme of the invention is as follows: the multistage oil-water separation and same-well injection-production method in the horizontal shaft comprises the following steps:
divide into the horizontal well section that has first level horizontal well co-well injection and production section 1, intermediate level horizontal well co-well injection and production section 2 and last level horizontal well co-well injection and production section 3 for the structure is similar between the grades, and each level horizontal well co-well injection and production section basic component part has: casing 1022, tubing 1023, double-cone coalescent cyclone 107, production and injection annulus packer 106, downhole conventional packer 105, overflow automatic electronic control valve 1019, underflow three-way automatic electronic control valve 1020, reinjection series electronic control valve 1014, and downhole centralizer 108.
The oil pipes 1023 in the horizontal well injection and production sections which are connected in series are divided into an upper reinjection converging area 1024 and a lower production converging area 1025 by an oil pipe inner interlayer 9; in addition, the production-injection annulus packer 106 is additionally arranged in the production-merging area 1025 and the reinjection-merging area 1024 respectively, so that the produced liquid and the merged liquid in the production-merging area can flow separately without mutual interference; the reinjection area is the same.
If the horizontal well is mined in the initial mining stage, oil storage of each oil reservoir section is rich, at the moment, the multi-stage injection mining sections in the same well in the horizontal well do not interfere with each other and work independently, overflow liquid with high oil content after respective cyclone separation is collected in a mining and converging area 1025, and all the collected overflow liquid enters an oil pipe 1023 and is finally lifted to the ground.
When the horizontal well mining enters a middle stage, the underflow of the lower oil-containing zone is not reinjected to the original reinjection holes, but the underflow obtained after the rotational flow separation of the low oil-containing zones is collected in the reinjection converging zone 1024, the collected part of the underflow enters the empty zone of the oil ring of the high oil-containing zone through the reinjection series electric control valve 1014 of the high oil-containing zone and is reinjected to the corresponding reinjection holes together with the underflow of the current high oil-containing zone, so that the perforation permeability of the high oil-containing zone is enhanced.
And after the horizontal well is mined in a later stage, closing an overflow port of the same well injection mining area in the interval section losing the mining value at the moment, and only keeping the displacement process of the underflow fluid for the high oil-bearing area.
The method is implemented according to the following steps:
step one, through detecting the oil deposit distribution of a horizontal well to be mined, placing multiple stages of injection-production sections of the same well in a conventional horizontal shaft, enabling the lengths of the injection-production sections of the same well to be adapted to the distance L between an underground extraction perforation and a reinjection perforation, separating a reinjection convergence region 1024 from the extraction convergence region 1025 through an internal interlayer 9 of two oil pipes in the oil pipes, avoiding the mixing and channeling of extracted liquid and reinjection liquid, and placing an injection stop packer 1015 at the head end and the tail end of the reinjection convergence region 1024 and at the tail end of the extraction convergence region 1025 to ensure that the recovery and the reinjection do not interfere with each other;
step two, a production-injection annulus packer 106 with the interval of L corresponding to the positions of the recovery perforation 6 and the recovery perforation 7 is respectively fixed inside the reinjection convergence zone 1024 and the production convergence zone 1025 in the step one, and the production-injection annulus packer 106, the oil collar empty zone 10 and the oil pipe 1023 are communicated with the inside to respectively form a production liquid through cavity 10605 and a reinjection liquid through cavity 10606, so that the production liquid and the reinjection liquid can smoothly enter and discharge the same-well injection production section of the production liquid and the reinjection liquid respectively; the overflow confluence liquid and the underflow confluence liquid respectively flow in the respective confluence recovery liquid circulation cavity 10603 and confluence reinjection liquid circulation cavity 10604, and finally flow through the two cavities without mutual interference;
thirdly, an automatic overflow electric control valve 1019 is additionally arranged at the position of an overflow port of the double-cone type coalescence cyclone 107, a bottom flow port is improved into a three-port, an automatic underflow three-way electric control valve 1020 is additionally arranged, a downhole centralizer 108 is sleeved at the position, close to the overflow pipe and the bottom flow pipe, of the double-cone type coalescence cyclone, and a reinjection series electric control valve 1014 capable of adjusting the passage of reinjection liquid is connected between an oil ring dead zone and a reinjection confluence zone 1024 of each level of same well injection and mining section to control the underflow reinjection liquid of the reinjection confluence zone 1024 to enter a corresponding high oil-containing zone reinjection perforation, so that the perforation permeability of the zone is improved;
placing a multi-stage conventional underground packer 104 corresponding to the same-well injection and production section in the oil pipe of each oil storage area, and ensuring the independent operation of each stage of the same-well injection and production section when the horizontal well production is in the initial production stage;
each level of oil-water separation and same well injection and production section in the horizontal shaft comprises a first level of same well injection and production section 1, a middle level of same well injection and production section 2 and a last level of same well injection and production section 3, and when the levels of same well injection and production sections do not interfere with each other and work independently, the working methods of the levels are the same; that is, the downhole mixed liquid from the first-stage recovery perforation 10001 enters the empty area of the oil collar through the opening on the sleeve 1022, and only enters the first-stage double-cone coalescence cyclone 10005 of the separation area through the first-stage front production-injection annulus packer 10003 under the restriction of the first-stage front packer 10008 and the first-stage rear packer 10009, and by coalescence, cyclone and separation of the mixed incoming liquid, the lighter oil-containing phase flows away through the overflow port, at this time, the first-stage overflow automatic electric control valve 10006 is in an open state, the heavy water-containing phase flows away through the underflow port, at this time, the first-stage underflow three-way automatic electric control valve 10007 is in an open state of the underflow separate injection port, the underflow series injection port is in a closed state, and at the same time, the first-stage reflux series electric control valve 10010 is also in a; overflow liquid of a first-stage same-well injection and production system is converged into a produced and converged area 1025, and underflow liquid can only enter a first-stage reinjection perforation 10002 through a first-stage post-production and injection annulus packer 10004; the middle-stage co-well injection and production section and the final-stage co-well injection and production section complete independent oil-water separation of each stage under the operation of the method, and overflow liquid of each stage finally completing separation flows into a production junction area 1025 and finally enters an oil pipe 1023 and is lifted to the ground; and separated underflow liquid at each stage enters the empty area of the oil sleeve ring at each stage, and can only enter reinjection perforations at each stage due to the existence of the front packer and the rear packer, so that the independent work of injection and mining sections of the same well at each stage is realized.
Step five: and when the horizontal well mining enters a middle stage, displacing the high oil-containing area by using the reinjection liquid after the low oil-containing area is separated, and realizing the high perforation permeability of the high oil-containing area.
Step six: after the horizontal well exploitation is in the later stage, closing an overflow port of the same-well exploitation area in the interval with the lost exploitation value by operating an electromagnetic valve; only the bottom flow port is communicated to the reinjection convergence zone and finally enters the middle-stage reinjection perforation to finish the displacement effect on the middle-stage same-well injection and production section of the high oil-bearing zone.
The invention has the following beneficial effects: the multi-stage oil-water separation and same-well injection-production method in the horizontal shaft is simple, convenient and high in automation degree, can utilize an intelligent detection platform to monitor the underground working condition in real time, automatically adopts different-stage independently working same-well injection-production methods or low-oil-content region to high-oil-content region displacement methods for the well conditions in different states, and controls the universal underground electric control valve in an electric mode, the required energy is supplied by underground cables, and corresponding cable interfaces are arranged in different-stage same-well injection-production sections and are butted with the cables to form special energy sources for the different-stage same-well injection-production sections, so that different oil production modes of continuous injection-production and collaborative injection-production are realized. By adopting the multi-stage oil-water separation and same-well injection-production method in the horizontal shaft, the exploitation value of the horizontal well can be realized to the maximum extent, the water content of crude oil is reduced, and the current oil well recovery efficiency is improved.
Description of the drawings:
FIG. 1 is a diagram of a downhole operation of a multi-stage oil-water separation and injection-production method in a horizontal well.
FIG. 2 is a side view of a well bore structure in a horizontal well bore for multiple stages of oil-water separation and injection-production in the same well.
FIG. 3 is a schematic diagram of downhole components involved in a multi-stage oil-water separation and injection-production method in a horizontal wellbore.
FIG. 4 is a flow trajectory diagram of multiple stages of oil-water separation in a horizontal wellbore and separate operation of the stages in a same well injection-production method.
FIG. 5 is a diagram of the trajectory of the earlier stage fluid flow of the multi-stage oil-water separation and injection-production in the same well for the displacement of the low-oil-content zone to the high-oil-content zone in the horizontal shaft.
FIG. 6 is a trace diagram of the later stage liquid flow of the low oil-containing zone to the high oil-containing zone reinjection displacement in the multi-stage oil-water separation and same well injection-production method in the horizontal shaft.
Fig. 7 is an overall structure diagram of a multi-stage oil-water separation and same-well injection-production device in a horizontal shaft.
Fig. 8 is an exploded view of a multi-stage oil-water separation and co-well injection and production device in a horizontal wellbore.
FIG. 9 is an overall appearance diagram of a primary horizontal well co-well injection production section.
FIG. 10 is a view of the internal structure of the same-well injection and production section of the first-stage horizontal well.
FIG. 11 is a sectional view of a primary horizontal well co-injection production section.
Fig. 12 is an exploded view of a same-well injection section of a first-stage horizontal well.
Fig. 13 is an overall appearance diagram of a middle horizontal well co-well injection mining section.
FIG. 14 is a structural view of the interior of a single-well injection section of a middle horizontal well.
Fig. 15 is an exploded view of a middle horizontal well co-well injection-production section.
Fig. 16 is an overall appearance diagram of a final-stage horizontal well co-well injection mining section.
FIG. 17 is a diagram of the internal structure of the final stage horizontal well co-injection production section.
Fig. 18 is an exploded view of a final stage horizontal well co-well injection and production section.
FIG. 19 is a cross-sectional view of a horizontal interval wellbore.
Fig. 20 is a left side view of a horizontal interval wellbore.
FIG. 21 is an overall external view of a double-cone coalescing cyclone.
FIG. 22 is a view of the internal structure of a double-cone coalescing cyclone.
Fig. 23 is an external view of the novel coalescer.
Fig. 24 is a cross-sectional view of the novel coalescer.
FIG. 25 is an external view of a spiral flow path.
FIG. 26 is a cross-sectional view of a spiral flow passage.
FIG. 27 is an exterior view of a production annulus packer.
FIG. 28 is a cross-sectional view of a production annulus packer.
FIG. 29 is a cross-sectional view of the overflow elbow.
FIG. 30 is a cut-away view of the underflow tee.
FIG. 31 is an exterior view of a downhole wireline interface.
FIG. 32 is an exterior view of a production injection cut-off packer.
FIG. 33 is an external view of a downhole centralizer.
FIG. 34 is an external view of a vertical well section.
FIG. 35 is an external view of a surface drive screw pump system.
In the figure, 4-vertical well section, 5-surface drive screw pump system, 1022-casing, 1023-oil pipe, 104-downhole conventional packer, 106-production-injection annulus packer, 107-double cone coalescence cyclone, 108-downhole centralizer, 1014-reinjection series electric control valve, 1015-production-injection stop packer, 1019-overflow automatic electric control valve, 1020-underflow three-way automatic electric control valve, 1024-reinjection confluence zone, 1025-production confluence zone, 1026-cable interface, 6-recovery perforation, 7-reinjection perforation, 9-oil pipe internal partition, 10-oil pipe annulus zone, 10603-confluence liquid recovery flow through cavity, 10604-confluence reinjection flow through cavity, 10605-production liquid through cavity, 10606-reinjection flow through cavity, 1-first-stage co-well injection production section, 10001-first-stage recovery perforation, 10002-first-stage reinjection perforation, 10003-first-stage pre-recovery injection annulus packer, 10004-first-stage post-recovery injection annulus packer, 10005-first-stage double-cone coalescence swirler, 10006-first-stage overflow automatic electric control valve, 10007-first-stage underflow three-way automatic electric control valve, 10008-first-stage pre-packer, 10009-first-stage post-packer, 10010-first-stage reinjection series electric control valve, 10011-first-stage downhole cable connector, 2-middle-stage co-well injection production section, 201-middle-stage recovery perforation, 202-middle-stage reinjection perforation, 203-middle-stage pre-recovery injection annulus packer, 204-middle-stage post-recovery injection annulus packer, 205-middle-stage double-cone swirler, 206-middle-stage overflow automatic electric control valve, 207-middle-stage underflow three-way automatic electric control valve, 208-middle-stage front packer, 209-middle-stage rear packer, 210-middle-stage reinjection series electric control valve, 211-middle-stage downhole cable interface, 3-last-stage co-well injection section, 301-last-stage recovery perforation, 302-last-stage reinjection perforation, 303-last-stage front production injection annulus packer, 304-last-stage post production injection annulus packer, 305-last-stage double-cone coalescence swirler, 306-last-stage overflow automatic electric control valve, 307-last-stage underflow tee automatic electric control valve, 308-last-stage front packer, 309-last-stage rear packer, 310-last-stage reinjection series electric control valve, 311-last-stage downhole cable interface; 101-produced fluid inlet, 102-reinjection fluid outlet, 103-connecting pipe thread, 104-producing packer, 105-reinjection packer, 106-producing annulus packer, 107-double cone type coalescence cyclone, 108-downhole centralizer, 109-overflow elbow, 1010-underflow tee pipe, 1011-producing pump, 1012-reinjection pump, 1013-downhole coupler, 1014-reinjection series electric control valve, 1015-injection and production stop packer, 1016-novel coalescer, 1017-spiral flow channel, 1018-overflow connecting pipe, 1019-overflow automatic electric control valve, 1020-underflow tee automatic electric control valve, 1021-downhole coupler fixer, 1022-casing, 1023-oil pipe, 1024-reinjection merging area, 1025-production merging area, 1026-downhole cable interface, 101601-coalescer overflow pipe, 101701-spiral runner overflow pipe, 10601-production and injection liquid through hole, 10602-confluence production and injection liquid circulation zone, 101001-underflow series reinjection port, 101002-underflow single reinjection port, 405-connecting transition elbow, 6-recovery perforation, 7-reinjection perforation and 8-underground cable.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
first, as shown in fig. 1 and fig. 2, the overall structure of the multistage oil-water separation and same-well injection-production method in a horizontal well according to the present invention is described: the multi-stage oil-water separation and same-well injection-production method in the horizontal shaft is mainly used for the underground work of a horizontal well, the appearance of the method is not greatly different from that of a common conventional well section, the structures of all the stages are similar, the method is basically composed of a casing 1022, an oil pipe 1023, a double-cone type coalescence cyclone 107, a production-injection annulus packer 106, a conventional underground packer 104, an overflow automatic electric control valve 1019, a bottom flow three-way automatic electric control valve 1020, a reinjection series electric control valve 1014 and an underground centralizer 108, all the stages of the same-well injection-production sections are connected in series in a horizontal well recovery perforation 6 and a reinjection perforation 7 with the interval of L in a mode that all the stages of the same-well injection-production sections are connected end to end, the oil pipes in all the stages of the same-well injection-production sections connected in series separate a reinjection junction region 1024 and a production junction region 1025 from the reinjection junction region through an inner interlayer 9 of the oil pipes, the produced liquid and the produced liquid are prevented from mixing, and not, The production-injection annular packer 106 with the interval of L corresponding to the position of the reinjection perforation hole 7 is communicated with the interior of the production-injection annular packer 106, the oil collar empty area 10 and the oil pipe 1023 to form a produced liquid through cavity 10605 and a reinjection liquid through cavity 10606 respectively, so that produced liquid and reinjection liquid can smoothly enter and be discharged from the same-well injection production section of the production-injection annular packer; the overflow confluence liquid and the underflow confluence liquid respectively flow in the respective confluence fluid recycling cavity 10603 and confluence fluid reinjection cavity 10604, and finally flow in different ways without mutual interference.
The specific implementation of the method depends on a special device, and the device is introduced as follows:
with reference to fig. 9, 10, 11 and 12, the appearance structure of the first-stage horizontal well co-well injection and production section 1 is introduced, the appearance of the first-stage horizontal well co-well injection and production section is cylindrical and is similar to a conventional shaft, the outer layer is a casing 1022, the inner layer is an oil pipe 1023, the casing is respectively provided with a plurality of produced fluid inlets 101 and reinjection fluid outlets 102 for producing and reinjecting an oil-containing zone in the stratum, and downhole conventional packers, namely a downhole conventional production packer 104 and a downhole conventional reinjection packer 105, are arranged in the casing to prevent the reinjection fluid from influencing the produced fluid; the inner layer of the oil pipe is a production merging area 1025 and a reinjection merging area 1024 which are respectively positioned at the lower layer and the upper layer in the oil pipe through partition plates and are not interfered with each other, and production and injection annular packers 106 which are oppositely distributed are arranged in the oil pipe, so that the inlet of produced liquid and the discharge of reinjection liquid are not influenced under the condition that overflow and underflow are successfully merged; in the oil pipe innermost layer is the oil-water separation working area, the double cone type coalescence cyclone 107 is arranged in the middle position, the mixed liquid entering from the produced liquid inlet 101 is coalesced, swirled and separated through the novel coalescer 1017 and the spiral flow passage 1018, the separated overflow enters the produced pump 1011 through the gaps of a series of parts such as the overflow connecting pipe 1018, the down-hole coupling fixer 1020 and the down-hole coupling 1013, the produced pump 1011 drives the overflow liquid to enter the overflow elbow 109 controlled by the overflow automatic electric control valve 1019, and finally the overflow liquid is collected to the produced confluence area 1025, the separated underflow enters the back injection pump 1012 through the gap of the rear end down-hole coupling fixer 1020 and the down-hole coupling 1013, the back injection pump 1012 drives the underflow liquid to enter the underflow three-way pipe 1010, the underflow three-way pipe 1010 is provided with the corresponding underflow three-way automatic electric control valve 1020, when the co-injection production section of the horizontal well is in the high oil-containing area, the bottom flow is controlled to enter a bottom flow independent reinjection port 101002 of a bottom flow three-way pipe 1010 and finally enters the section of reinjection perforation through a reinjection liquid outlet 102 of the horizontal well co-well injection and production section, if the horizontal well co-well injection and production section is in a low oil-containing area, the bottom flow is controlled to enter a bottom flow serial reinjection port 101001 of the bottom flow three-way pipe 1010 and is collected to a reinjection confluence area 1024, and finally enters the reinjection perforation of a high oil-containing area of the same well injection and production section through the reinjection liquid outlet 102 under the control of a reinjection serial electric control valve 1014 of the same well injection and production section in a certain high oil-containing area, so that the purpose of displacing the oil-; an injection and production stop packer 1015 is additionally arranged in a reinjection converging area 1024 at the front end of the injection and production section 1 of the same well of the first-stage horizontal well, so that the phenomenon that the collected reinjection liquid enters an inner layer of an oil pipe and is mixed with produced liquid to destroy the separation effect is avoided; in addition, for the internal double-cone coalescence cyclone 107, in view of the design structure with a large front end and a small rear end, a downhole centralizer 108 is additionally arranged at the rear end close to the underflow, so that the stability of the double-cone coalescence cyclone 107 can be maintained, the underflow liquid can be prevented from damaging the incoming liquid at the inlet, and the stable operation of the downhole oil-water cyclone separation can be ensured.
Fig. 13, 14 and 15 are illustrations of the appearance structure of the middle horizontal well co-injection mining section 2, while fig. 16, 17 and 18 are illustrations of the appearance structure of the final-stage horizontal well co-injection mining section 3, so that it can be seen that the appearance structures of the middle horizontal well co-injection mining section 2 and the final-stage horizontal well co-injection mining section 3 are substantially similar to those of the first-stage horizontal well co-injection mining section 1, and the main difference lies in that: a reinjection and production stop packer 1015 is not arranged in a reinjection and production junction region 1024 at the front end of the injection and production section 2 of the same well of the middle horizontal well, so that reinjection liquid in the reinjection and production junction region 1024 is smoothly merged; the reinjection convergence area 1024 at the front end of the injection and production section 3 of the last-stage horizontal well is also not provided with an injection and production stop packer 1015 for the purpose, but the reinjection convergence area 1024 and the production convergence area 1025 at the rear end of the reinjection convergence area are respectively provided with the injection and production stop packer 1015, the reinjection convergence area 1024 and the production convergence area 1025 of the injection and production section 3 of the last-stage horizontal well are prevented from channeling impurities into the final-stage horizontal well due to the fact that the reinjection convergence area 1024 and the production convergence area 1025 are located at the last horizontal stage and the underground working condition is complex, and stable operation of an underground device is affected. Because the horizontal well co-injection and production sections of all levels are connected in series in sequence to form the underground work function, the underground continuous work of the horizontal well co-injection and production sections of all levels is realized by designing connecting pipe threads 103 at the front end and the rear end of the horizontal well co-injection and production sections of all levels, and the lower end of the vertical well section 4 is provided with a connecting transition elbow 401, so that separated produced liquid can smoothly enter the vertical well section 4 and is lifted to the ground surface.
Fig. 19 to 33 are specific illustrations of the appearance design and the structural composition of all the components related to the above description.
The oil-water separation and injection-production method in the same well is implemented specifically according to the following steps:
the method comprises the following steps: through detecting the oil deposit distribution of a horizontal well to be mined, multiple stages of same-well injection and production sections are placed in a conventional horizontal shaft, the lengths of the different stages of same-well injection and production sections are enabled to be adaptive to the distance L between a downhole production perforation and a reinjection perforation through reasonable design, a reinjection convergence region 1024 and a production convergence region 1025 are separated from each other through two oil pipe internal interlayers 9 inside an oil pipe, mixing and channeling of produced liquid and the reinjection liquid are avoided, and a production stop packer 1015 is placed at the head end and the tail end of the reinjection convergence region 1024 and at the tail end of the production convergence region 1025 to ensure that the recovery and the reinjection are not interfered with each other.
Step two: in the first step, production-injection annulus packers 106 with the intervals of L corresponding to the positions of the recovery perforation 6 and the recovery perforation 7 are respectively fixed inside the reinjection merging area 1024 and the production merging area 1025, and the production-injection annulus packers 106, the oil collar empty area 10 and the oil pipe 1023 are communicated to respectively form a production liquid through cavity 10605 and a reinjection liquid through cavity 10606, so that the production liquid and the reinjection liquid can smoothly enter and discharge the same-well injection production section of the production liquid and the reinjection liquid respectively; the overflow confluence liquid and the underflow confluence liquid respectively flow in the respective confluence fluid recycling cavity 10603 and confluence fluid reinjection cavity 10604, and finally flow in different ways without mutual interference.
Step three: on the basis of the conventional co-well injection and production process, an overflow automatic electric control valve 1019 is additionally arranged at the overflow port of the double-cone type coalescence cyclone 107, the underflow port is improved to be a three-way port design, an underflow three-way automatic electric control valve 1020 is additionally arranged, a downhole centralizer 108 is sleeved at the position, close to the overflow pipe and the underflow pipe, of the double-cone type coalescence cyclone, the stability of the double-cone type coalescence cyclone can be kept, mixing of inlet liquid, underflow liquid and overflow liquid is prevented, an isolation and sealing effect is achieved, meanwhile, a reinjection series electric control valve 1014 capable of adjusting the passage of reinjection liquid is connected between an oil lantern ring dead zone of each level of co-well injection and production section and a reinjection confluence zone 1024 to control the underflow reinjection liquid of the reinjection confluence zone 1024 to enter a corresponding high-oil-containing zone reinjection perforation, and the perforation permeability of the zone is improved. All the electric control valves are general underground electric control valves controlled in an electric mode, energy required by the electric control valves is supplied by underground cables, and corresponding cable interfaces 1026 are arranged in all levels of the same-well injection and production sections and are in butt joint with the cables to form special energy sources for all levels of the same-well injection and production sections.
Step four: a multi-stage conventional underground packer 104 corresponding to the same-well injection and production section is placed in an oil pipe of each oil storage area, so that independent operation of each stage of the same-well injection and production section is guaranteed, a first stage same-well injection and production section 1, a middle stage same-well injection and production section 2 and a last stage same-well injection and production section 3 are respectively assumed to have three stages of oil-water separation and same-well injection and production sections in a horizontal shaft, when the stages of the same-well injection and production sections are not interfered with each other and work independently, the working methods of each stage are the same, and the first stage same-well injection and production section 1 is taken as an example. The downhole mixed liquid from the first-stage recovery perforation 10001 enters the empty area of the oil collar through an opening on a sleeve 1022, and can only enter the first-stage double-cone coalescence cyclone 10005 of the separation area through the first-stage front production-injection annulus packer 10003 under the restriction of the first-stage front packer 10008 and the first-stage rear packer 10009, and finally, the lighter oil-containing phase flows away through the overflow port through the actions of coalescence, cyclone, separation and the like on the mixed incoming liquid, at this time, the first-stage overflow automatic electric control valve 10006 is in an open state, the heavy water-containing phase flows away through the underflow port, at this time, the first-stage underflow three-way automatic electric control valve 10007 is in an open state of the underflow independent return port, the underflow series return port is in a closed state, and simultaneously, the first-stage return series electric control valve 10010 is also in. Through the control of the series of automatic valves, overflow liquid of the primary injection and production system in the same well is led to be merged into the production merging area 1025, and underflow liquid can only enter the primary reinjection perforation 10002 through the primary post-production annulus packer 10004. Similarly, the middle-stage co-well injection and production section 2 and the last-stage co-well injection and production section 3 also complete the independent oil-water separation of each stage under the operation of the method, and all overflow liquid finally completing the separation of each stage flows into the production junction area 1025 and finally enters the oil pipe 1023 and is lifted to the ground; and separated underflow liquid at each stage enters the empty area of the oil sleeve ring at each stage, and can only enter reinjection perforations at each stage due to the existence of the front packer and the rear packer, so that the independent work of injection and mining sections of the same well at each stage is realized.
Step five: when the reinjection liquid after the separation of the low oil-bearing zone is needed to displace the high oil-bearing zone, the middle-stage co-well injection and production section 2 is assumed to be a high oil-bearing section, and the first-stage co-well injection and production section 1 and the last-stage co-well injection and production section 3 are low oil-bearing sections, that is, the bottom-flow reinjection liquid of the first-stage co-well injection and production section 1 and the last-stage co-well injection and production section 3 is needed to displace the middle-stage co-well injection and production section 2, so that the high perforation permeability of the middle-stage co-well injection and production section 2 is realized. At this time, under the independent working state of the original step four, the first-stage underflow three-way automatic electronic control valve 10007 is closed for the underflow independent reinjection port, the underflow series reinjection port is opened, and the first-stage reinjection series electronic control valve 10010 is closed; meanwhile, the bottom flow independent reinjection port of the final-stage bottom flow three-way automatic electric control valve 307 is controlled to be closed, the bottom flow series reinjection port is opened, and the final-stage reinjection series electric control valve 310 is controlled to be closed; the middle stage reinjection series electronic control valve 210 is opened, and the rest of the electronic control valves of all stages are kept unchanged. By the adjusting method, the liquid inlet and separation processes of the first-stage co-well injection mining section 1 and the last-stage co-well injection mining section 3 in the low oil-bearing zone are unchanged, the overflow processes of all the stages are also unchanged, but the two-stage underflow liquid can enter the reinjection converging zone 1024, because the mining stop packers 1015 are arranged at the two ends of the reinjection converging zone 1024, the underflow liquid collected in the reinjection converging zone 1024 can only enter the empty zone of the middle-stage oil collar through the channel of the middle-stage reinjection series-connected electric control valve 210, and simultaneously the underflow liquid in the empty zone of the middle-stage co-well injection mining section can also enter the oil collar through the middle-stage post-production annulus packer 207, and because the front and rear ends of the empty zone of the middle-stage oil collar are also provided with the middle-stage front packer 208 and the middle-stage rear packer 209, all the underflow reinjection liquid collected in the empty zone can only enter the middle-stage reinjection hole 202 at the position, so that the flooding section 2 of the middle-stage co-well injection mining section 2 can be flooded by the first-stage co- And instead, the oil permeability in the middle-stage recovery perforation 201 of the middle-stage same-well injection production section 2 is further improved.
Step six: and on the basis of the fifth step, the bottom flow reinjection liquid of the first-stage co-well injection and production section 1 and the bottom flow reinjection liquid of the last-stage co-well injection and production section 3 are used for completing displacement on the middle-stage co-well injection and production section 2, so that the crude oil permeability in the middle-stage recovery perforation 201 is improved. However, when the oil content of the recovery fluid in the first-stage co-well injection and production section 1 and the last-stage co-well injection and production section 3 of the low oil-containing region is continuously reduced, or even the cyclone separation condition of co-well injection and production cannot be met, the first-stage overflow automatic electric control valve 10006 of the first-stage co-well injection and production section 1 and the last-stage overflow automatic electric control valve 306 of the last-stage co-well injection and production section 3 need to be closed on the basis of the operation method of the sixth step. At the moment, the inlet processes of the first-stage co-well injection and production section 1 and the last-stage co-well injection and production section 3 are not changed, the overflow ports of the first-stage co-well injection and production section and the last-stage co-well injection and production section are closed, only the underflow port is communicated to the reinjection convergence zone 1024 and finally enters the middle-stage reinjection perforation 202, and the displacement effect on the middle-stage co-well injection and production section 2 in the high oil-bearing zone is completed.
In conjunction with the above detailed description, a specific downhole operation principle is described below:
when the device works in a horizontal well, the underground stock solution of a recovery perforation 6 in a reservoir enters an empty area of an oil ring through a corresponding produced fluid inlet 101 on a sleeve 1022, the produced fluid can only enter a biconical coalescence cyclone 107 at the innermost layer of an oil pipe through a produced fluid hole 10601 on a production and injection annulus packer 106 due to the blocking of a production packer 104 and a reinjection packer 105 in the interior, then the small oil drops are collided and coalesced into large oil drops through the action of a novel coalescer 1016 in the coalescence cyclone, and an oil phase and a water phase are formed in an external distribution state, then the oil phase enters a spiral flow passage 1017 in the state, the underground high-efficiency oil-water separation is completed under the action of centrifugal force by virtue of density difference among different media, the separated light oil phase is gathered in the center of the coalescence cyclone and sequentially comes to an overflow area along the spiral flow passage 101701, an overflow flow passage 101601 and an overflow connecting pipe 1018, then the overflow liquid enters a production pump 1011 through the clearance of a downhole coupler 1013 in the overflow area, the overflow liquid is discharged to a production confluence area 1025 through an overflow elbow 109 by the power provided by the production pump 1011, simultaneously the same process is carried out on the same injection and production sections of other levels of horizontal wells, the overflow liquid from the same injection and production sections of different levels of horizontal wells is gathered in the production confluence area 1025 and then enters the oil pipe of the vertical well section 4 along the oil pipe channel and a transition connecting elbow 401, and finally the overflow liquid is lifted to the ground by a ground driving screw pump system 5; the separated heavy water phase in the cyclone can only enter the underflow area along the underflow channel, and also enters the reinjection pump 1012 along the gap of the underground shaft coupler 1013 in the underflow area, and the reinjection pump and the extraction pump have the same working principle, so that the underflow liquid can be sent to the underflow three-way pipe 1010. At the moment, the device can judge whether the injection and production section of the same well of the horizontal well is in a high oil-bearing area or not according to the actual condition of the current well condition, if the injection and production section of the same well of the current horizontal well is in the high oil-bearing area, the bottom flow three-way automatic electric control valve 1020 can control the opening and closing of the bottom flow three-way pipe 1010, so that the bottom flow of the bottom flow three-way pipe directly enters the reinjection perforation 7 of the injection and production section of the same well of the current horizontal well through the; otherwise, if the current horizontal well co-well injection and production section is in the low oil-containing zone, the underflow three-way automatic electric control valve 1020 controls the underflow liquid to be injected into the reinjection converging zone 1024 through the underflow series reinjection port 101001 of the underflow three-way pipe 1010, meanwhile, other horizontal well co-well injection and production sections are also performing the same execution operation, and then the underflow liquid collected into the reinjection converging zone 1024 is determined to enter the reinjection perforation 7 of other high oil-containing zones through the reinjection series electric control valve 1014 under the judgment of the device. Along with the production and injection work in different underground sections, when the underground liquid of some sections is basically oil-free or is not enough to reach the cyclone separation and recovery conditions, the device can close the overflow port of the section at the position of the section through the automatic overflow electric control valve 1019, so that the condition that the injection and the recovery sections of the same well of the horizontal well are only injected and not recovered is formed, the ground secondary separation caused by overhigh water content in the produced liquid is avoided, and the production cost is reduced. All the electric control valves are applicable underground, energy required by the electric control valves is supplied by an underground cable 8, and corresponding cable interfaces 1026 are arranged in all the same-well injection and production sections and are in butt joint with the cable to form special energy sources for all the same-well injection and production sections.
Fig. 3, 4, 5 and 6 mainly illustrate different working principle diagrams of a multi-stage oil-water separation and same-well injection-production method in a horizontal shaft, firstly fig. 3 is a distribution diagram of all underground parts related to the principle description, and the diagram mainly takes a three-stage same-well injection-production section as an example for description and is respectively a first-stage same-well injection-production section 1, a middle-stage same-well injection-production section 2 and a last-stage same-well injection-production section 3.
The description is given by referring to fig. 4, when the injection and production sections of the same well at all levels do not interfere with each other and work independently, the working methods of all levels are the same, taking the injection and production section of the same well at the first level as an example. The downhole mixed liquid from the first-stage recovery perforation 10001 enters the empty area of the oil collar through an opening on a sleeve 1022, and can only enter the first-stage double-cone coalescence cyclone 10005 of the separation area through the first-stage front production-injection annulus packer 10003 under the restriction of the first-stage front packer 10008 and the first-stage rear packer 10009, and finally, the lighter oil-containing phase flows away through the overflow port through the actions of coalescence, cyclone, separation and the like on the mixed incoming liquid, at this time, the first-stage overflow automatic electric control valve 10006 is in an open state, the heavy water-containing phase flows away through the underflow port, at this time, the first-stage underflow three-way automatic electric control valve 10007 is in an open state of the underflow independent return port, the underflow series return port is in a closed state, and simultaneously, the first-stage return series electric control valve 10010 is also in. Through the control of the series of automatic valves, overflow liquid of the primary injection and production system in the same well is led to be merged into the production merging area 1025, and underflow liquid can only enter the primary reinjection perforation 10002 through the primary post-production annulus packer 10004. Similarly, the middle-stage co-well injection and production section 2 and the last-stage co-well injection and production section 3 also complete the independent oil-water separation of each stage under the operation of the method, and all overflow liquid finally completing the separation of each stage flows into the production junction area 1025 and finally enters the oil pipe 1023 and is lifted to the ground; and separated underflow liquid at each stage enters the empty area of the oil sleeve ring at each stage, and can only enter reinjection perforations at each stage due to the existence of the front packer and the rear packer, so that the independent work of injection and mining sections of the same well at each stage is realized.
With reference to fig. 5, when the reinjection liquid after separation of the low oil-bearing zone is needed to displace the high oil-bearing zone, it is assumed that the middle-stage co-well injection-production section 2 is a high oil-bearing section, and the first-stage co-well injection-production section 1 and the last-stage co-well injection-production section 3 are low oil-bearing sections, that is, the bottom injection reinjection liquid of the first-stage co-well injection-production section 1 and the last-stage co-well injection-production section 3 is needed to displace the middle-stage co-well injection-production section 2, so as to achieve high perforation permeability of the middle-stage co-well injection-production section 2. At this time, under the independent working state of the original step four, the first-stage underflow three-way automatic electronic control valve 10007 is closed for the underflow independent reinjection port, the underflow series reinjection port is opened, and the first-stage reinjection series electronic control valve 10010 is closed; meanwhile, the bottom flow independent reinjection port of the final-stage bottom flow three-way automatic electric control valve 307 is controlled to be closed, the bottom flow series reinjection port is opened, and the final-stage reinjection series electric control valve 310 is controlled to be closed; the middle stage reinjection series electronic control valve 210 is opened, and the rest of the electronic control valves of all stages are kept unchanged. By the adjusting method, the liquid inlet and separation processes of the first-stage co-well injection mining section 1 and the last-stage co-well injection mining section 3 in the low oil-bearing zone are unchanged, the overflow processes of all the stages are also unchanged, but the two-stage underflow liquid can enter the reinjection converging zone 1024, because the mining stop packers 1015 are arranged at the two ends of the reinjection converging zone 1024, the underflow liquid collected in the reinjection converging zone 1024 can only enter the empty zone of the middle-stage oil collar through the channel of the middle-stage reinjection series-connected electric control valve 210, and simultaneously the underflow liquid in the empty zone of the middle-stage co-well injection mining section can also enter the oil collar through the middle-stage post-production annulus packer 207, and because the front and rear ends of the empty zone of the middle-stage oil collar are also provided with the middle-stage front packer 208 and the middle-stage rear packer 209, all the underflow reinjection liquid collected in the empty zone can only enter the middle-stage reinjection hole 202 at the position, so that the flooding section 2 of the middle-stage co-well injection mining section 2 can be flooded by the first-stage co- And instead, the oil permeability in the middle-stage recovery perforation 201 of the middle-stage same-well injection production section 2 is further improved.
With reference to fig. 6, when the bottom-flow reinjection fluids of the first-stage co-well injection and production section 1 and the last-stage co-well injection and production section 3 complete the displacement of the middle-stage co-well injection and production section 2 and operate for a period of time, and the oil content of the recovery fluids in the first-stage co-well injection and production section 1 and the last-stage co-well injection and production section 3 in the low oil-containing region is continuously reduced, or even the cyclone separation condition of co-well injection and production cannot be met, the first-stage overflow automatic electric control valve 10006 of the first-stage co-well injection and production section 1 and the last-stage overflow automatic electric control valve 306 of the last-stage co-well injection and production section 3 need to be closed on the basis of the. At the moment, the inlet processes of the first-stage co-well injection and production section 1 and the last-stage co-well injection and production section 3 are not changed, the overflow ports of the first-stage co-well injection and production section and the last-stage co-well injection and production section are closed, only the underflow port is communicated to the reinjection convergence zone 1024 and finally enters the middle-stage reinjection perforation 202, and the displacement effect on the middle-stage co-well injection and production section 2 in the high oil-bearing zone is completed.
All the electric control valves are general underground electric control valves controlled in an electric mode, energy required by the electric control valves is supplied by underground cables, and corresponding cable interfaces are arranged in all levels of the same-well injection and production sections and are in butt joint with the cables to form special energy sources for all levels of the same-well injection and production sections.
The multi-stage oil-water separation and same-well injection-production method in the horizontal shaft creatively combines a multi-stage same-well injection-production process with displacement among different underground oil-containing sections, so that bottom flow injection liquid in different sections can be automatically distributed according to different well conditions, intelligent displacement of low oil-containing sections to high oil-containing sections is realized, the underground recovery rate is improved, and the maximum yield of the exploitation value of the horizontal well is realized. Therefore, any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A multi-stage oil-water separation and same-well injection-production method in a horizontal shaft comprises the following steps:
divide into the horizontal well section that has first level horizontal well co-well injection and production section (1), intermediate level horizontal well co-well injection and production section (2) and last level horizontal well co-well injection and production section (3) for the structure is similar between the grades, and every level horizontal well co-well injection and production section basic component part has: the device comprises a casing (1022), an oil pipe (1023), a double-cone coalescent cyclone (107), a production-injection annulus packer (106), a downhole conventional packer (105), an overflow automatic electronic control valve (1019), an underflow three-way automatic electronic control valve (1020), a reinjection series electronic control valve (1014) and a downhole centralizer (108);
the horizontal well recovery sections are connected in series in the horizontal well recovery perforation (6) and the reinjection perforation (7) with the interval of L in an end-to-end connection mode, and an oil pipe (1023) in each horizontal well recovery section connected in series is divided into an upper reinjection convergence zone (1024) and a lower production convergence zone (1025) through an oil pipe inner partition layer (9); in addition, a production-injection annulus packer (106) is additionally arranged in the production merging area (1025) and the reinjection merging area (1024) respectively, so that produced liquid and the merged liquid in the production merging area can flow separately without mutual interference; the reinjection area is the same;
if the horizontal well is mined in the initial mining stage, each oil reservoir section has rich oil storage, at the moment, the multi-stage injection mining sections in the same well in the horizontal well do not interfere with each other and work independently, overflow liquid with high oil content after respective cyclone separation is collected in a mining junction area (1025), and all the collected overflow liquid enters an oil pipe (1023) and is finally lifted to the ground;
when the horizontal well mining enters a middle stage, the underflow of the lower oil-containing zone is not reinjected to the original reinjection holes of the horizontal well, but the underflow liquid of the low oil-containing zone after cyclone separation is collected in a reinjection converging zone (1024), the collected part of the underflow liquid enters an oil jacket empty zone of the high oil-containing zone through a reinjection series electric control valve (1014) of the high oil-containing zone and is reinjected to the corresponding reinjection holes together with the underflow liquid of the current high oil-containing zone so as to enhance the perforation permeability of the high oil-containing zone;
and after the horizontal well is mined in a later stage, closing an overflow port of the same well injection mining area in the interval section losing the mining value at the moment, and only keeping the displacement process of the underflow fluid for the high oil-bearing area.
2. The method of claim 1, wherein the method comprises the following steps:
the method comprises the steps that firstly, through distribution detection of an oil reservoir of a horizontal well to be mined, multiple stages of injection-production sections of the same well are placed in a conventional horizontal shaft, the length of each stage of injection-production sections of the same well is matched with the distance L between an underground extraction perforation and an reinjection perforation, a reinjection convergence region (1024) and an extraction convergence region (1025) are separated from each other through an inner interlayer (9) of two oil pipes in the oil pipes, mixing of extraction liquid and the reinjection liquid is avoided, and production stop packers (1015) are placed at the head end and the tail end of the reinjection convergence region (1024) and at the tail end of the extraction convergence region (1025) to ensure that the recovery and the reinjection do not interfere with each other;
step two, a production injection annulus packer (106) which corresponds to the positions of the recovery perforation holes (6) and the reinjection perforation holes (7) and has the interval of L is respectively fixed inside the reinjection convergence zone (1024) and the production convergence zone (1025) in the step one, and the production injection annulus packer (106), the oil collar empty zone (10) and the oil pipe (1023) are communicated with the inside to respectively form a produced liquid through cavity (10605) and a reinjection liquid through cavity (10606), so that produced liquid and reinjection liquid can smoothly enter and be discharged from the same-well injection production section of the reinjection zone; the overflow confluence liquid and the underflow confluence liquid respectively flow in a confluence recovery liquid circulation cavity (10603) and a confluence reinjection liquid circulation cavity (10604), and finally the overflow confluence liquid and the underflow confluence liquid respectively flow in different ways without mutual interference;
thirdly, an overflow automatic electronic control valve (1019) is additionally arranged at the position of an overflow port of the double-cone type coalescence cyclone (107), a bottom flow port is improved into a three-port, an underflow three-way automatic electronic control valve (1020) is additionally arranged, a downhole centralizer (108) is sleeved at the position, close to the overflow pipe and the bottom flow pipe, of the double-cone type coalescence cyclone, and a reinjection series electronic control valve (1014) capable of adjusting the passage of reinjection liquid is connected between an oil collar dead zone and a reinjection confluence zone (1024) of each level of the same-well injection and mining section to control the underflow reinjection liquid of the reinjection confluence zone (1024) to enter a corresponding reinjection perforation of a high oil-bearing zone, so that the perforation permeability of the zone is improved;
placing a multi-stage conventional underground packer (104) corresponding to the same-well injection and production section in the oil pipe of each oil storage area, and ensuring the independent operation of each stage of the same-well injection and production section when the horizontal well production is in an initial production stage;
each level of oil-water separation and same well injection and production section in the horizontal shaft comprises a first level of same well injection and production section 1, a middle level of same well injection and production section 2 and a last level of same well injection and production section 3, and when the levels of same well injection and production sections do not interfere with each other and work independently, the working methods of the levels are the same; under the limitation of a first-stage front packer (10008) and a first-stage rear packer (10009), the mixed liquid in the well from the first-stage recovery perforation (10001) can only enter a first-stage double-cone coalescence cyclone (10005) of a separation area through a first-stage front recovery injection annulus packer (10003), the lighter oil-containing phase flows away through an overflow port by coalescence, cyclone and separation of mixed liquid, the first-stage overflow automatic electric control valve (10006) is in an open state, the heavy water-containing phase flows away through a underflow port, the first-stage underflow three-way automatic electric control valve (10007) is in an open state of an underflow independent return port, the underflow series return port is in a closed state, and the first-stage return series electric control valve (10010) is also in a closed state; overflow liquid of a first-stage injection-production system in the same well is converged into a produced-production convergence area (1025), and underflow liquid can only enter a first-stage reinjection perforation (10002) through a first-stage post-production-injection annular packer (10004); the middle-stage co-well injection and production section (2) and the last-stage co-well injection and production section (3) complete independent oil-water separation of each stage under the operation of the method, and overflow liquid of each stage finally completing separation flows into a production junction area (1025) and finally enters an oil pipe (1023) and is lifted to the ground; the separated underflow liquid of each stage enters the empty area of the oil sleeve ring of each stage, and can only enter the reinjection perforation of each stage due to the existence of the front packer and the rear packer, so that the independent work of the injection and mining sections of the same well of each stage is realized;
step five: when the horizontal well mining enters a middle stage, displacing the high oil-containing area by using the reinjection liquid after the low oil-containing area is separated, and realizing the high perforation permeability of the high oil-containing area;
step six: after the horizontal well exploitation is in the later stage, closing an overflow port of the same-well exploitation area in the interval with the lost exploitation value by operating an electromagnetic valve; only the bottom flow port is communicated to the reinjection convergence zone and finally enters the middle-stage reinjection perforation to finish the displacement effect on the middle-stage same-well injection and production section of the high oil-bearing zone.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003023180A2 (en) * | 2001-09-07 | 2003-03-20 | Exxonmobil Upstream Research Company | Acid gas disposal method |
| US6719048B1 (en) * | 1997-07-03 | 2004-04-13 | Schlumberger Technology Corporation | Separation of oil-well fluid mixtures |
| WO2004053291A1 (en) * | 2002-12-12 | 2004-06-24 | Services Petroliers Schlumberger | Downhole separation of oil and water |
| CN101025080A (en) * | 2006-12-26 | 2007-08-29 | 大庆油田有限责任公司 | Method for realizing high-water containing same-well injection-production by multi-cup equi-flow type down-hole oil-water separator |
| CN101463718A (en) * | 2008-12-31 | 2009-06-24 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Same-well production technique column for low-permeation horizontal well |
| CN203008884U (en) * | 2013-01-12 | 2013-06-19 | 东北石油大学 | Downhole oil-water separation column for oil gas field development |
| CN104310628A (en) * | 2014-08-22 | 2015-01-28 | 中国石油化工集团公司 | Reutilization method of water-base fracturing flowback fluid |
| CN104389578A (en) * | 2014-12-05 | 2015-03-04 | 北京化工大学 | Offshore large-displacement downhole oil-water separation device with chemical agent injection function |
| CN104989369A (en) * | 2015-06-10 | 2015-10-21 | 中国海洋石油总公司 | High-flow-rate underground oil-water separation and annular space testing and regulating system |
| CN105114048A (en) * | 2015-08-17 | 2015-12-02 | 中国石油大学(华东) | Horizontal well staged fracturing oil production method through injection and production in same well |
| US20170058655A1 (en) * | 2015-08-31 | 2017-03-02 | Suncor Energy Inc. | Systems and methods for controlling production of hydrocarbons |
| CN110939426A (en) * | 2019-11-19 | 2020-03-31 | 东北石油大学 | Centrifugal separation mechanism and co-well injection and production device using same |
-
2020
- 2020-11-17 CN CN202011289247.1A patent/CN112240194B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6719048B1 (en) * | 1997-07-03 | 2004-04-13 | Schlumberger Technology Corporation | Separation of oil-well fluid mixtures |
| WO2003023180A2 (en) * | 2001-09-07 | 2003-03-20 | Exxonmobil Upstream Research Company | Acid gas disposal method |
| WO2004053291A1 (en) * | 2002-12-12 | 2004-06-24 | Services Petroliers Schlumberger | Downhole separation of oil and water |
| CN101025080A (en) * | 2006-12-26 | 2007-08-29 | 大庆油田有限责任公司 | Method for realizing high-water containing same-well injection-production by multi-cup equi-flow type down-hole oil-water separator |
| CN101463718A (en) * | 2008-12-31 | 2009-06-24 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Same-well production technique column for low-permeation horizontal well |
| CN203008884U (en) * | 2013-01-12 | 2013-06-19 | 东北石油大学 | Downhole oil-water separation column for oil gas field development |
| CN104310628A (en) * | 2014-08-22 | 2015-01-28 | 中国石油化工集团公司 | Reutilization method of water-base fracturing flowback fluid |
| CN104389578A (en) * | 2014-12-05 | 2015-03-04 | 北京化工大学 | Offshore large-displacement downhole oil-water separation device with chemical agent injection function |
| CN104989369A (en) * | 2015-06-10 | 2015-10-21 | 中国海洋石油总公司 | High-flow-rate underground oil-water separation and annular space testing and regulating system |
| CN105114048A (en) * | 2015-08-17 | 2015-12-02 | 中国石油大学(华东) | Horizontal well staged fracturing oil production method through injection and production in same well |
| US20170058655A1 (en) * | 2015-08-31 | 2017-03-02 | Suncor Energy Inc. | Systems and methods for controlling production of hydrocarbons |
| CN110939426A (en) * | 2019-11-19 | 2020-03-31 | 东北石油大学 | Centrifugal separation mechanism and co-well injection and production device using same |
Non-Patent Citations (5)
| Title |
|---|
| GELLER,B D: ""failure of actinmycin D inhibit antitoxin production to a challenging injection of antigen", 《WEB OF SCIENCE》 * |
| N油田同井注采技术界限研究: "郑灵芸", 《工程科技I辑》 * |
| 大庆石油学院: "井下油水分离工艺及产出水回注理论研究", 《大庆石油学院》 * |
| 王杰: "扶余油田中区水平井开发方式及注采参数研究", 《工程科技I辑》 * |
| 程时清: "水平井同井注采技术", 《大庆石油地质与开发》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115822508A (en) * | 2023-02-10 | 2023-03-21 | 山东圣颐石油技术开发有限公司 | Multi-stage hydraulic setting co-well injection and production system pipe column |
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| CN112240194B (en) | 2022-07-19 |
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