CN207795072U - Perforation-test-gas lift flowing back union action tubular column - Google Patents

Perforation-test-gas lift flowing back union action tubular column Download PDF

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Publication number
CN207795072U
CN207795072U CN201721880799.3U CN201721880799U CN207795072U CN 207795072 U CN207795072 U CN 207795072U CN 201721880799 U CN201721880799 U CN 201721880799U CN 207795072 U CN207795072 U CN 207795072U
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China
Prior art keywords
test
valve
gas lift
perforation
pressure
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CN201721880799.3U
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Inventor
强晓光
王磊
孙成林
姜增所
于洋洋
于友元
邱贻旺
高翔
詹婷婷
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Petrochina Co Ltd
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Petrochina Co Ltd
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Abstract

The utility model discloses a perforation-test-gas lift flowing back union action tubular column belongs to the oil production equipment field. The perforation-test-gas lift liquid discharge combined pipe column comprises: the gas lift type perforating gun comprises a gas lift working barrel, a positioning short section, a testing valve, a pressure gauge supporting barrel, a pressure transmission valve, a packer, a sieve tube, a pressure detonator and a perforating gun arranged at the lower end of the pressure detonator, wherein the gas lift working barrel, the positioning short section, the testing valve, the pressure gauge supporting barrel, the pressure transmission valve, the packer, the sieve tube, the pressure detonator and the perforating. The utility model provides a perforation-test-gas lift flowing back combined operation tubular column when carrying out the oil testing operation, through using gas lift working barrel, test valve, pressure detonator, perforation gun cooperation, only need to go up down the operation once to going up in the pit shaft, can accomplish perforation, formation pressure change test, three processes of gas lift flowing back, has not only reduced staff's intensity of labour, has improved oil testing operating efficiency moreover, has reduced the oil testing operating cost.

Description

A kind of perforation-test-gas lift liquid drainage axle-linked cable-car
Technical field
The utility model is related to oil production equipment field, more particularly to a kind of perforation-test-gas lift liquid drainage axle-linked cable-car.
Background technology
During the exploration and development in oil field, in order to obtain the property of formation fluid, the yield of various fluids, strata pressure And the data such as pressure change in process fluid flow, and the various of stratum are obtained by analysis to these data and processing Physical parameter evaluates stratum, provides reliable foundation for the exploitation in oil field, formation testing must be carried out before the production operation of oil field Operation.
The prior art when carrying out oil test operation, first into pit shaft transfer perforation-test string (including:Test valve, pressure transmission Valve, screen casing, perforating gun etc.), to obtain the pressure change in strata pressure and process fluid flow.Then, by the perforation-survey Test tube column rises, and transfer into the pit shaft gas lift liquid drainage tubing string (including:Gas lift valve), to obtain formation fluid sample, work Personnel can obtain the data such as property, the yield of various fluids of formation fluid from the formation fluid sample.Wait for gas lift liquid drainage After operation, gas lift liquid drainage tubing string is gone out from pit shaft.
Designer has found that the existing technology has at least the following problems:
The prior art needs to remove tubing string twice in pit shaft, increases the labor of staff when carrying out oil test operation Fatigue resistance reduces oil test operation efficiency, increases oil test operation cost.
Utility model content
The utility model embodiment provides a kind of perforation-test-gas lift liquid drainage axle-linked cable-car, can solve above-mentioned technology and ask Topic.Specific technical solution is as follows:
The utility model embodiment provides a kind of perforation-test-gas lift liquid drainage axle-linked cable-car, and the tubing string includes:It is logical Cross gas-lift working barrel, orientation spool that multiple oil pipes are sequentially connected with and are connected from top to bottom, test valve, manometer, pressure transmission Valve, packer, screen casing, pressure detonator and perforating gun in the pressure detonator lower end is set.
In a kind of possible design, the tubing string further includes:Damper, upper end are connect by oil pipe with the screen casing, Lower end is connect by oil pipe with the pressure detonator.
In a kind of possible design, the gas-lift working barrel, the orientation spool, the test valve, the pressure gauge Hold in the palm cylinder, the pressure transmission valve, the packer, the screen casing, the pressure detonator, the damper with the tubing round thread Connection.
In a kind of possible design, the gas-lift working barrel includes:Top connection, hydraulic valve, center, housing, gaslift Valve, lower contact;
The top connection, the center, the lower contact are sequentially connected with from top to bottom;
The upper end of the top connection is connect by the oil pipe with well head, the lower end of the lower contact by the oil pipe with The orientation spool connection;
The both ends of the housing are connect with the top connection and the lower contact respectively, and, the housing be sleeved on it is described in The outside of heart set, and it is formed with annular space with the center, it is described to put on the inlet being provided with the gas lift valve outside The inlet opening of connection;
The hydraulic valve and the gas lift valve are fixed on from top to down in the annular space;
The center top is provided with fluid hole;
The piston for blocking the fluid hole is fixed with by shear pin in the hydraulic valve, when the shear pin is cut When, the liquid outlet of the gas lift valve, the hydraulic valve, the fluid hole are sequentially connected to.
In a kind of possible design, the test valve is selected well testing valve.
In a kind of possible design, the packer is RTTS packers.
The advantageous effect brought of technical solution that the utility model embodiment provides is:
Perforation-test-gas lift liquid drainage axle-linked cable-car that the utility model embodiment provides passes through when carrying out oil test operation Pressure transmission valve is set, ensure that the annular pressure above packer can smoothly be transferred to the lower section of packer, is risen with starting pressure Quick-fried device, makes it light a fire perforating gun, penetrates out test layer using perforating gun, completes perforating job.Valve, pressure are tested by setting Power meter support cylinder only needs open and close to test valve, you can obtains the pressure change on stratum using manometer, realizes downhole testing.It is logical Setting gas-lift working barrel is crossed, the connection of perforation-test-gas lift liquid drainage axle-linked cable-car and pit shaft may be implemented, completes gas lift liquid drainage Operation.As it can be seen that perforation-test-gas lift liquid drainage axle-linked cable-car that the utility model embodiment provides, only need to carry out one into pit shaft It is secondary to remove operation, you can to complete perforation, strata pressure variation test, gas lift liquid drainage three process, not only reduce staff Labor intensity, and improve oil test operation efficiency, reduce oil test operation cost.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.
Fig. 1 is the structural schematic diagram for perforation-test-gas lift liquid drainage axle-linked cable-car that the utility model embodiment provides;
Fig. 2 is the diagrammatic cross-section for the gas-lift working barrel that the utility model embodiment provides.
Reference numeral indicates respectively:
1 oil pipe,
2 gas-lift working barrels,
201 top connections,
202 hydraulic valves,
203 centers,
2031 fluid holes,
204 housings,
2041 inlet openings,
205 gas lift valves,
206 lower contacts,
3 orientation spools,
4 test valves,
5 manometers,
6 pressure transmission valves,
7 packers,
8 screen casings,
9 pressure detonators,
10 perforating guns,
11 dampers.
Specific implementation mode
It is new to this practicality below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer Type embodiment is described in further detail.
The utility model embodiment provides a kind of perforation-test-gas lift liquid drainage axle-linked cable-car, and as shown in Fig. 1, this is penetrated Hole-test-gas lift liquid drainage axle-linked cable-car includes:The gas-lift working barrel for being sequentially connected with and being connected from top to bottom by multiple oil pipes 1 2, orientation spool 3, test valve 4, manometer 5, pressure transmission valve 6, packer 7, screen casing 8, pressure detonator 9 and setting exist The perforating gun 10 of 9 lower end of pressure detonator.
The operation principle of the perforation-test-gas lift liquid drainage axle-linked cable-car provided below with regard to the utility model embodiment is given Description:
When needing to carry out oil test operation, by perforation-test-pretreated pit shaft of gas lift liquid drainage axle-linked cable-car tripping in It is interior, at this point, test valve 4 and gas-lift working barrel 2 is made to be in off working state.It is positioned in pit shaft by orientation spool 3 to be tested Position (corresponding test layer), completion is located at the test position by rotating tubing string set packer 7, by perforation-test- Gas lift liquid drainage axle-linked cable-car is fixed in pit shaft.
Annular space is carried out using the pump truck of well head to suppress, and is made its work to open test valve 4, is made perforation-test-gas lift liquid drainage Axle-linked cable-car is in upper and lower connected state.Continue annular space to suppress, by pressure transmission valve 6 by the annular pressure of the top of packer 7 It is transferred to the lower section of packer 7, to start pressure detonator 9, it is made to light a fire perforating gun 10, is penetrated out using perforating gun 10 Test layer, at this time formation fluid sample by screen casing 8 into entrance aperture-test-gas lift liquid drainage axle-linked cable-car.Then, annular space is let out Pressure closes test valve 4, the pressure change on stratum is obtained by manometer 5.
Then, it carries out annular space using the pump truck of well head to suppress, makes its work to open test valve 4, make perforation-test-gas It lifts drain axle-linked cable-car and is in upper and lower connected state.
It is suppressed into perforation-test-gas lift liquid drainage axle-linked cable-car, working condition is to open gas-lift working barrel 2, Perforation-test-gas lift liquid drainage axle-linked cable-car is set to be connected to pit shaft.At this point, annular space injects high pressure gas, the high pressure gas is made to pass through Gas-lift working barrel 2 into entrance aperture-test-gas lift liquid drainage axle-linked cable-car, and in perforation-test-gas lift liquid drainage axle-linked cable-car Formation fluid sample be sufficiently mixed, to reduce the density of fluid sample, make high pressure gas drive fluid sample quickly drain into Well head completes sampling operation, subsequently to carry out analysis and evaluation to the fluid sample.It in the process, can be according to scene Actual job need, valve 4 is tested in multiple open and close, obtains the pressure change data on multigroup stratum, it is ensured that the ground finally got Layer data is more accurate.
After waiting for above-mentioned operation, perforation hole-test-gas lift liquid drainage axle-linked cable-car is played, obtains the pressure in manometer 5 The data of power meter record.
Perforation-test-gas lift liquid drainage axle-linked cable-car that the utility model embodiment provides passes through when carrying out oil test operation Pressure transmission valve 6 is set, ensure that the annular pressure of 7 top of packer can smoothly be transferred to the lower section of packer 7, to start pressure Initiator 9 makes it light a fire perforating gun 10, penetrates out test layer using perforating gun 10, completes perforating job.It is surveyed by being arranged Valve 4, manometer 5 are tried, open and close is only needed to test valve 4, you can obtains the pressure change on stratum using manometer 5, realizes Downhole testing.By setting gas-lift working barrel 2, the connection of perforation-test-gas lift liquid drainage axle-linked cable-car and pit shaft may be implemented, Complete gas lift liquid drainage operation.As it can be seen that the utility model embodiment provide perforation-test-gas lift liquid drainage axle-linked cable-car, only need to It carries out once removing operation in pit shaft, you can complete perforation, strata pressure variation test, gas lift liquid drainage three process, not only drop The low labor intensity of staff, and oil test operation efficiency is improved, reduce oil test operation cost.
It should be noted that according to the actual job needs (such as deep-well, ultradeep well) at scene, it can be by gas-lift working barrel 2 quantity is set as multiple, for example, it could be provided as 2,3,4 etc..
It should be noted that in the formation testing system that the utility model embodiment provides, orientation spool 3, pressure gauge support Cylinder 5, pressure transmission valve 6, screen casing 8, pressure detonator 9, perforating gun 10 are the common formation test tool in this field, put up with it below Give simple general introduction respectively:
Orientation spool 3 be it is a kind of in perforation for Accurate Determining oil, gas-bearing formation depth short oil pipe, be generally located on target Near at the above 30m in test layer top.The common orientation spool 3 in this field is gamma magnetic orientation pipe nipple, is based on magnetic orientation school Deep technology, before carrying out perforation, tripping in magnetic probe, using compound the penetrating of natural gamma (GR) and magnetic orientation (CCL) oil jacket Hole depth correction skill, to obtain perforation school, (concrete principle can refer to Shu Yigang and exist deeply《Oil instrument》(the 3rd phase of volume 21 in 2007) The application of disclosed magnetic orientation curve and gamma curve).Zhang Kai is bright to be waited《Oil instrument》One is disclosed in (in December, 2014) The structure of kind gamma magnetic orientation pipe nipple.Those skilled in the art also can obtain the orientation spool 3 by purchased in market, such as Tianjin reaches The magnetic locator sub of Li Pu petroleum pipe Co., Ltd sale.
It can be selected well testing valve (SelectTestValve, abbreviation STV) to test valve 4, suppress realization by annular space and open Well, closing well, while assisting for obtaining output sample.For example, which includes pressure operation test valve, groups of springs At, nitrogen chamber, annular space reference pressure collection system.After packer 7 is set, carries out annular space using the pump truck of well head and suppress, pressure It acts in mobile mandrel, compressed nitrogen, power mandrel, which moves down, drives ball valve rotating opening, realization to drive a well.After annular space pressure release, by In the effect of transposition locking device, ball valve is still kept open, and applies operating pressure to annular space again, can release ball valve lock Fixed, ball valve, which is closed, realizes closing well.More detailed information to testing valve 4 can be found in various kinds of document, for example, deer at it is bright etc.《Oil gas Well test》(2006,15(3):The operation principle and field application situation or various of selected well testing valve disclosed in 41-43) Open to the correlation of selected well testing valve on website, the utility model embodiment does not describe excessively herein.Certainly, art technology Personnel can also obtain the test valve 4 by purchased in market, such as Yantai San Men mechanical equipments Co., Ltd produces and sells complete Selection for nominal diameter tests valve.
Manometer 5 is the important technology equipment in logging technique field, in the utility model embodiment, the pressure gauge Support cylinder 5 includes support cylinder ontology and is built in the pressure gauge held in the palm in cylinder ontology, which has memory function, can measure simultaneously The down-hole pressure under different time sections is remembered, to be read on demand after rising outside well.Terminate in formation testing operation When perforation hole-test-gas lift liquid drainage axle-linked cable-car, the pressure data on pressure gauge can be read according to activity duration section It takes, and then finds out pressure change in different time periods to draw pressure curve.Those skilled in the art can be obtained by purchased in market The manometer 5, such as the model TT110/45Z2SA's of Daqing Saiensi Electronic Equipment Equipment Co., Ltd's sale are special The manometer of door installation direct-reading pressure gauge.
Pressure transmission valve 6 is used for the annular pressure above packer 7 being transmitted under packer 7 in the utility model embodiment Fang Qidong pressure detonators 9, and then perforating gun 10 is made to carry out perforation to test layer, those skilled in the art can also be by purchased in market Obtain, for example, Zhuhai Ling Kong automation equipments Co., Ltd sale model 250A-65 pneumatic pressure transmission valve.
Packer 7 can be RTTS packers.RTTS packers are common for this field, are a kind of big orifices, can seal Every the hold-down packer of bidirection press, for example, the RTTS packers include J-shaped slot inversion mechanism, slips, packing rubber sleeve With Hydraulic Anchorage mechanism.When preparing to go into the well, J-shaped slot is placed in latched position, and slips is in contraction state, during going into the well, when When perforation-test-gas lift liquid drainage axle-linked cable-car reaches test position preparation operation, to right rotation tubing string, tubing string is made to keep dextrorotation Torque transfers perforation-test-gas lift liquid drainage axle-linked cable-car, until packer slip starts to bear tubing string weight, with subsequent Continuous decentralization perforation-test-gas lift liquid drainage axle-linked cable-car, until packer bear it is desired set weight, complete to set at this time. When down-hole formation pressure is more than head of liquid, the stretching of packer Hydraulic Anchorage mechanism is stuck on casing wall RTTS packers, can It prevents from pushing packer when RTTS packer low pressures are excessive, causes to lose envelope phenomenon.
Pressure detonator 9 and perforating gun 10 are common perforation tools, and enclosed point is wherein provided in pressure detonator 9 Duration and degree of heating, to drive perforating gun 10 to carry out perforating job, the structure about pressure detonator 9 can be found in Lu Xuebin etc. and exist《Engineering is quick-fried It is broken》The development and application of full-bore pressure detonator, the utility model embodiment disclosed in (the 4th phase of volume 15 in December, 2009) Excessive description is not remake herein.In addition, the perforation that perforating gun 10 is sold by buying Renqiu City Chen Yang metal products Co., Ltd Rifle 10 obtains;Screen casing 8 can be obtained by buying the Petroleum screen tube of Hebei Rui Naier petroleum pipelines Equipment Limited sale .
In order to enable gas-lift working barrel 2 to smoothly complete gas lift liquid drainage operation, simultaneously, it is ensured that gas-lift working barrel 2 structure letter It is single, it is easy to process.As shown in Fig. 2, gas-lift working barrel 2 includes:Top connection 201, hydraulic valve 202, center 203, housing 204, gas lift valve 205, lower contact 206.Wherein, top connection 201, center 203, lower contact 206 are sequentially connected with from top to bottom.On The upper end of connector 201 is connect by oil pipe 1 with well head, and the lower end of lower contact 206 is connect by oil pipe 1 with orientation spool 3.Housing 204 both ends are connect with top connection 201 and lower contact 206 respectively, and, housing 204 is sleeved on the outside of center 203, and in Heart set 203 is formed with annular space, and the inlet opening 2041 being connected to the inlet of gas lift valve 205 is provided on housing 204.Hydraulic pressure Valve 202 and gas lift valve 205 are fixed in annular space from top to down.203 top of center is provided with fluid hole 2031.Hydraulic pressure The piston for blocking fluid hole 2031 is fixed with by shear pin in valve 202, when shear pin is cut, gas lift valve 205 goes out liquid Mouth, hydraulic valve 202, fluid hole 2031 are sequentially connected to.
When needing to carry out gas lift liquid drainage operation, is suppressed into perforation-test-gas lift liquid drainage axle-linked cable-car, make hydraulic valve The shear pin on piston in 202 is cut under pressure, and piston moves downward in hydraulic valve 202, and then makes gas lift valve 205 liquid outlet, hydraulic valve 202, fluid hole 2031 are sequentially connected to.It suppresses, opens at this point, carrying out annular space using the pump truck of well head Valve 4 is tested, while annular space injects high pressure gas, so that the high pressure gas is passed through the inlet opening 2041 on housing 204 and enter gas lift valve 205 inlet, and in the liquid outlet, hydraulic valve 202,2031 laggard entrance aperture-survey of fluid hole for sequentially flowing through gas lift valve 205 In examination-gas lift liquid drainage axle-linked cable-car, and it is sufficiently mixed with the formation fluid sample in perforation-test-gas lift liquid drainage axle-linked cable-car, To reduce the density of fluid sample, make high pressure gas that fluid sample be driven quickly to drain into well head, completes gas lift liquid drainage operation.
It is understood that above-mentioned gas-lift working barrel 2 is in off working state and working condition refers to gas lift valve 205 It is in off state or opening state.
Perforation-test-gas lift liquid drainage connection is made in pressure oscillation in order to reduce generation when perforating gun 10 carries out perforating job Tubing string impacts, and avoids influencing the data that pressure gauge records in manometer 5.As shown in Fig. 1, the perforation-test-gas Lifting drain axle-linked cable-car further includes:Damper 11.The damper 11 is connect with the upper end of pressure detonator 9 by oil pipe 1.
Wherein, damper 11 is common for this field, and those skilled in the art can be obtained by purchased in market, and citing comes It says, can be the SJ type double-acting shock absorbers that coal industrial and mineral goods and materials Group Co., Ltd produces and sells in Shandong.
In the utility model embodiment, gas-lift working barrel 2, orientation spool 3, test valve 4, manometer 5, pressure transmission valve 6, packer 7, screen casing 8, pressure detonator 9, damper 11 are threadedly coupled with oil pipe 1.By so set, ensure that each portion Part connect fastening with oil pipe 1, while easy to disassemble, when above-mentioned a certain component is damaged, can be replaced in time to it.
The above is only the preferred embodiment of the present invention, the protection domain being not intended to limit the utility model, Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should be included in this reality Within novel protection domain.

Claims (6)

1. a kind of perforation-test-gas lift liquid drainage axle-linked cable-car, which is characterized in that the tubing string includes:Pass through multiple oil pipes (1) The gas-lift working barrel (2) that is sequentially connected with and is connected from top to bottom, test valve (4), manometer (5), passes orientation spool (3) The perforation of pressure valve (6), packer (7), screen casing (8), pressure detonator (9) and setting in the pressure detonator (9) lower end Rifle (10).
2. perforation-test-gas lift liquid drainage axle-linked cable-car according to claim 1, which is characterized in that the tubing string also wraps It includes:Damper (11), upper end are connect by oil pipe (1) with the screen casing (8), and lower end passes through oil pipe (1) and the pressure blasting Device (9) connects.
3. perforation-test-gas lift liquid drainage axle-linked cable-car according to claim 2, which is characterized in that the gas-lift working barrel (2), the orientation spool (3), the test valve (4), the manometer (5), the pressure transmission valve (6), the packer (7), the screen casing (8), the pressure detonator (9), the damper (11) are threadedly coupled with the oil pipe (1).
4. perforation-test-gas lift liquid drainage axle-linked cable-car according to claim 1, which is characterized in that the gas-lift working barrel (2) include:Top connection (201), hydraulic valve (202), center (203), housing (204), gas lift valve (205), lower contact (206);
The top connection (201), the center (203), the lower contact (206) are sequentially connected with from top to bottom;
The upper end of the top connection (201) is connect by the oil pipe (1) with well head, and the lower end of the lower contact (206) passes through The oil pipe (1) connect with the orientation spool (3);
The both ends of the housing (204) are connect with the top connection (201) and the lower contact (206) respectively, and, the housing (204) it is sleeved on the outside of the center (203), and annular space, the housing are formed with the center (203) (204) inlet opening (2041) being connected to the inlet of the gas lift valve (205) is provided on;
The hydraulic valve (202) and the gas lift valve (205) are fixed on from top to down in the annular space;
Center (203) top is provided with fluid hole (2031);
The piston for blocking the fluid hole (2031) is fixed with by shear pin in the hydraulic valve (202), when the shear pin When being cut, liquid outlet, the hydraulic valve (202), the fluid hole (2031) of the gas lift valve (205) are sequentially connected to.
5. perforation-test-gas lift liquid drainage axle-linked cable-car according to claim 1, which is characterized in that the test valve (4) For selected well testing valve.
6. perforation-test-gas lift liquid drainage axle-linked cable-car according to claim 1, which is characterized in that the packer (7) For RTTS packers.
CN201721880799.3U 2017-12-28 2017-12-28 Perforation-test-gas lift flowing back union action tubular column Active CN207795072U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110630226A (en) * 2019-09-16 2019-12-31 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 Isolated gas lift drainage method
CN111487026A (en) * 2020-04-09 2020-08-04 中国石油天然气集团有限公司 Perforation high-frequency vibration damping effect test and downhole tubular column analysis method
CN112282682A (en) * 2020-10-26 2021-01-29 大庆油田有限责任公司 Underground electronic liquid inlet device for oil-gas well
CN113550722A (en) * 2020-04-08 2021-10-26 中国石油化工股份有限公司 Perforation, test and flowback integrated multifunctional pipe column and construction method thereof
WO2024067726A1 (en) * 2022-09-30 2024-04-04 中国石油天然气集团有限公司 Negative-pressure perforation and dst combination testing string

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110630226A (en) * 2019-09-16 2019-12-31 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 Isolated gas lift drainage method
CN113550722A (en) * 2020-04-08 2021-10-26 中国石油化工股份有限公司 Perforation, test and flowback integrated multifunctional pipe column and construction method thereof
CN113550722B (en) * 2020-04-08 2023-04-07 中国石油化工股份有限公司 Perforation, test and flowback integrated multifunctional pipe column and construction method thereof
CN111487026A (en) * 2020-04-09 2020-08-04 中国石油天然气集团有限公司 Perforation high-frequency vibration damping effect test and downhole tubular column analysis method
CN112282682A (en) * 2020-10-26 2021-01-29 大庆油田有限责任公司 Underground electronic liquid inlet device for oil-gas well
WO2024067726A1 (en) * 2022-09-30 2024-04-04 中国石油天然气集团有限公司 Negative-pressure perforation and dst combination testing string

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