CN107542434A - Plunger gas lift liquid drainage device for horizontal gas well and production method - Google Patents
Plunger gas lift liquid drainage device for horizontal gas well and production method Download PDFInfo
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- CN107542434A CN107542434A CN201710935653.2A CN201710935653A CN107542434A CN 107542434 A CN107542434 A CN 107542434A CN 201710935653 A CN201710935653 A CN 201710935653A CN 107542434 A CN107542434 A CN 107542434A
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- 239000007788 liquid Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 210000002445 nipple Anatomy 0.000 claims abstract description 22
- 238000005086 pumping Methods 0.000 claims description 16
- 241000521257 Hydrops Species 0.000 claims description 14
- 206010030113 Oedema Diseases 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 10
- 238000012856 packing Methods 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 230000003139 buffering effect Effects 0.000 claims description 5
- 238000011176 pooling Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003672 gas field water Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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Abstract
The invention discloses a plunger gas lift drainage device for a horizontal gas well and a production method thereof, and the plunger gas lift drainage device comprises a self-buffering plunger and a uniflow device which are arranged in an oil pipe, wherein the oil pipe comprises two pipelines with different pipe diameters and is connected through a reducing nipple, the self-buffering plunger is arranged in the pipeline at the upper part of the reducing nipple, the uniflow device is used for controlling the unidirectional flow of gas and liquid from bottom to top and is arranged in the pipeline at the lower part of the reducing nipple, the gas well can lift accumulated liquid in a shaft to the upper part of the uniflow device by means of self energy and stay, and the accumulated liquid is lifted to a well mouth by the self-buffering. The downhole tool of the existing plunger device is simplified; the single-flow device realizes the function of one-way gas-liquid flow, has a simple structure, is easy to put in and salvage, effectively utilizes the lifting capacity of the gas well, realizes the lifting of accumulated liquid of a part of inclined shaft sections and horizontal shaft sections at the bottom of the horizontal gas well, greatly reduces the height of a shaft liquid column, increases the gas production rate, and effectively solves the difficult problem of liquid drainage and gas production of the horizontal gas well.
Description
Technical field
The invention belongs to gas field production gas technology field, and in particular to a kind of plunger lift pumping equipment for horizontal gas well
And production method.
Background technology
There is the mouth of horizontal gas well more than 1300 in Ordos Basin Chang Qingqi areas at present, it is contemplated that reach 2700 mouthfuls after 10 years, aerogenesis
Amount will account for 76.7% in below 20000m3/d gas wells, and hydrops problem also gradually shows.
Plunger lift discharge opeing technology is using plunger as gas-liquid separation interface, can effectively prevent from altering on gas and be slided with liquid
De-, liquid efficiency is lifted in increase, and the technology does not fill chemical agent in addition, also with environmentally friendly feature.Foreign countries think plunger lift technique
Technology is low yield and the most economical effective water drainage-gas recovery technology of tight gas reservoir, oil/gas well stimulation 22%~500%, the investment payback time 4
Individual month, measure can apply exhausted to gas well.Carry out plunger lift technology investigative test within domestic 1991.Chang Qingqi areas attack
Pass have developed independent intellectual property right technique of plunger gas lift, realizes gas well and remotely adjusts ginseng and management in real time, altogether using 518 mouthfuls of wells,
The effect of liquid discharging gas producing has effectively been played, has been used manpower and material resources sparingly, especially suitable for fine and close gas field region area is wide, well is more, people is few
Exploitation actuality, turn into the major technique of gas field water pumping gas production.
Existing plunger assembly launches downhole tool in shaft bottom, main to realize the function of alleviating plunger falling impacts power.Due to
Horizontal well, which reaches shaft bottom since kickoff point (KOP) and enters window point hole deviation, gradually to be increased, and existing downhole tool is both difficult to enter high angle hole
Section, can not be locking in High angle well section, can be only applied to straight well section.And Chang Qingqi areas major part oil pipe of horizontal well is in shaft bottom
Have undergauge before into horizontal segment, can not be by herein in plunger dropping process, the following well section of oil pipe undergauge point (including horizontal segment
With part lower curved section) interior hydrops can not lift, and explanation can not realize the full wellbore effusion lifting of horizontal well, have a strong impact on plunger gas
Lift discharge opeing efficiency.Therefore it is limited to be applied to horizontal well discharge opeing effect for existing technique of plunger gas lift.Develop suitable level gas well
Plunger lift discharge opeing technology has important practical significance.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing one kind is used for water
The plunger lift pumping equipment and production method and supporting technology of flat gas well, the full wellbore effusion lifting of horizontal gas well is realized, greatly
Width reduces pit shaft liquid-column height, adds gas production, and application effect is notable, can solve the problem of horizontal gas well liquid discharging gas producing.
The present invention uses following technical scheme：
A kind of plunger lift pumping equipment for horizontal gas well, including be arranged in oil pipe from buffer plunger and single current
Device, the oil pipe include the different pipeline of two sections of calibers, and two sections of pipelines are connected by diameter changing nipple, described from bumper post
Plug is arranged in the oil pipe pipeline on the diameter changing nipple top, and there is the single flow device control gas-liquid unidirectionally to flow work(from bottom to top
Can, it is arranged in the oil pipe pipeline of the diameter changing nipple bottom, gas well can rely on self-energy to lift wellbore effusion to described
The top of single flow device and delay, then hydrops is lifted to well head from buffer plunger by described, complete discharge opeing production.
Further, described from buffer plunger is hollow structure, and one end is provided with the first fishing head, and the other end, which is provided with, leads
To bar and back-up ring, it is described be provided with from buffer plunger it is some be used to realize buffer spring of the plunger from pooling feature, it is described
Guide rod and back-up ring are used for the fixed support buffer spring.
Further, the first spring cylindrical pin and second spring cylinder are respectively arranged with the back-up ring and guide head
Pin.
Further, the guide rod end set have in the dropping process from buffer plunger be oriented to and
Shaft bottom supports the guide head from buffer plunger body.
Further, the guide rod is hollow structure.
Further, the single flow device includes single current valve, steel ball and packing element, one end and second of the single current valve
Fishing head is connected, and the other end is connected by the steel ball with the hollow passageway being arranged in the packing element.
A kind of horizontal gas well plunger lift pumping equipment production method, comprises the following steps：
S1, the different oil pipe of two sections caliber connected by diameter changing nipple, epimere oil will be arranged on from buffer plunger
In pipe, single flow device is arranged in the oil pipe of diameter changing nipple bottom；
S2, after driving a well, it is up from buffer plunger, the top hydrops of single flow device is lifted to well head, single flow device upwards
Bottom hydrops is lifted to the top of single flow device by gas self-energy；
After S3, closing well, carry that buffer plunger is descending, behind the end for reaching diameter changing nipple, carry the guide head of buffer plunger
Be hampered stop motion, from buffer plunger because effect of inertia continues traveling downwardly, alleviates itself kinetic energy by buffer spring, until stopping
Only；
The liquid for not giving rise to surface line in S4, pit shaft falls top to single flow device and from buffer plunger after rise, and stagnant
Stay in this；
S5, repeat step S2-S4 complete the full wellbore effusion lifting of horizontal gas well.
Compared with prior art, the present invention at least has the advantages that：
A kind of plunger lift pumping equipment for horizontal gas well of the invention, the different oil pipe pipeline of two sections of calibers is passed through
Diameter changing nipple links into an integrated entity, and is set in pipeline from buffer plunger and single flow device, plunger is not only increased from buffer plunger
Depth of setting, it also simplify the downhole tool of existing plunger assembly；Single flow device realizes the function of gas-liquid one-way flow, and ties
Structure is simple, easily launches, easily salvages, effectively utilizes the jacking capacity of gas well itself, realize horizontal gas well base section lower curved section
Lifted with horizontal segment wellbore effusion, significantly reduce pit shaft liquid-column height, add gas production, efficiently solve horizontal gas well row
The problem of liquid gas production.
Further, carry the new of buffering and spring is set from inside buffer plunger, realize plunger from the function of buffering；Bottom
Portion's guide rod and back-up ring play fixed spring position, prevent spring from slipping, and the effect of support spring；Guide head is played in plunger
It is oriented in dropping process and the effect in shaft bottom support plunger body, spring cylindrical pin plays the work of fixed back-up ring and guide head
With.
Further, single flow device is made up of single current valve, steel ball, packing element etc., realizes that single current fills after packing element expanded by heating
The sealing of outer wall and shaft in wall is put, and plays the function of positioning；Central passage realizes that gas-liquid is bottom-up by steel ball and valve
One way flow.So as to the function of realizing airdraulic lifting and be detained to single flow device top.
, will be up and down the invention also discloses a kind of method that plunger lift pumping equipment using horizontal gas well is produced
Two sections of different oil pipes of caliber are connected by diameter changing nipple, will be arranged on from buffer plunger in epimere oil pipe, single flow device is set
Put in diameter changing nipple；It is up from buffer plunger after driving a well, the top hydrops of single flow device is lifted to well head, single current upwards
Device bottom hydrops is lifted to the top of single flow device by gas self-energy；After closing well, it is descending to carry buffer plunger, reaches and becomes
Behind the end of footpath pipe nipple, the guide head for carrying buffer plunger is hampered stop motion, under buffer plunger continues due to effect of inertia
OK, itself kinetic energy is alleviated by buffer spring, until stopping；The liquid for not giving rise to surface line in pit shaft is fallen after rise to single current dress
Put and the top from buffer plunger, and be detained here, run so forth, so as to realize underground single flow device with from buffer plunger
The lifting of relay-type hydrops is formed, wellbore effusion is greatly reduced, the full wellbore effusion lifting of horizontal gas well is realized, gets through air-flow and lead to
Road, increase gas well coefficient of mining, reduce production cost.
Below by drawings and examples, technical scheme is described in further detail.
Brief description of the drawings
Fig. 1 is the efficient plunger gas lift liquid drainage production method and supporting technology schematic diagram that the present invention is used for horizontal gas well；
Fig. 2 is that the present invention is used for the plunger schematic diagram that horizontal gas well carries buffering；
Fig. 3 is single flow device schematic diagram of the present invention.
Wherein：1. oil pipe；2. from buffer plunger；The fishing heads of 2-1. first；2-2. buffer spring；2-3. guide rod；2-4.
First spring cylindrical pin；2-5. back-up ring；2-6. second spring straight pins；2-7. guide head；3. diameter changing nipple；4. single flow device；
The fishing heads of 4-1. second；4-2. single current valves；4-3. steel ball；4-4. packing element；4-5. hollow passageway.
Embodiment
In the description of the invention, it is to be understood that the orientation or position of the instruction such as term " on ", " under ", " interior ", " outer "
It is based on orientation shown in the drawings or position relationship to put relation, is for only for ease of the description present invention and simplifies description, rather than
Indicate or imply that signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore can not
It is interpreted as limitation of the present invention.In addition, term " first ", " second " be only used for describe purpose, and it is not intended that instruction or
Imply relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first ", the spy of " second " are defined
Sign can be expressed or implicitly include one or more this feature.In the description of the invention, unless otherwise indicated,
" multiple " are meant that two or more.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
The invention discloses a kind of plunger lift pumping equipment and production method for horizontal gas well, using from bumper post
Plug 2 and single flow device 4 carry out relay-type lifting discharge opeing, and the single flow device 4 is launched into the tubing string undergauge opening position in oil pipe 1,
Gas well is by self-energy lifting wellbore effusion, and the single flow device 4 will lift liquid holdup from body, from buffer plunger
Hydrops is lifted to well head by 2 by the undergauge position again, is completed discharge opeing, is realized horizontal well plunger lift liquid discharging gas producing, can answer
For High angle gas well, the application of plunger gas well is expanded, solves the problems, such as the production of horizontal gas well.
Referring to Fig. 1, the present invention is used for the efficient plunger gas lift liquid drainage production method of horizontal gas well, comprise the following steps：
S1, the different oil pipe 1 of two sections caliber connected by diameter changing nipple 3, epimere will be arranged on from buffer plunger 2
In oil pipe, single flow device 4 is arranged in the bottom oil pipe of diameter changing nipple 3；
A diameter of 88.9mm of epimere oil pipe 1, a diameter of 73.02mm of hypomere oil pipe 1.
As shown in Fig. 2 being hollow structure from buffer plunger 2, one end is provided with the first fishing head 2-1, described from buffering
Be provided with plunger 2 it is some be used to realize buffer spring 2-2 of the plunger from pooling feature, the other end be provided with guide rod 2-3 and
Back-up ring 2-5, for fixing the position of the buffer spring 2-2, prevent buffer spring 2-2 from slipping, and support buffer spring 2-2；
Played in the guide head 2-7 of the guide rod 2-3 ends and be oriented to from the dropping process of buffer plunger 2 and supporting plunger in shaft bottom
The effect of body, the first spring cylindrical pin 2-4 and second spring circle are respectively arranged with the back-up ring 2-5 and guide head 2-7
Pin 2-6, play fixation.
Preferably, guide rod 2-3 is arranged to hollow structure.
As shown in figure 3, the single flow device 4 includes single current valve 4-2, steel ball 4-3 and packing element 4-4, the single current valve
4-2 one end is connected with the second fishing head 4-1, and the other end is hollow in the packing element 4-4 with being arranged on by the steel ball 4-3
Passage 4-5 connections.
It is used for the sealing for realizing the outer wall and shaft in wall of the single flow device 4 after the packing element 4-4 expanded by heating, and rises
To the function of positioning；The hollow passageway 4-5 realizes the bottom-up one way flow of gas-liquid by steel ball 4-3 and single current valve 4-2,
So as to the function of realizing airdraulic lifting and be detained to single flow device top.
S2, after driving a well, it is up from buffer plunger 2, the top hydrops of single flow device 4 is lifted to well head upwards, single current dress
The top that 4 bottom hydrops are lifted to single flow device 4 by gas self-energy is put, single flow device 4 has what is unidirectionally flowed from bottom to top
Performance, gas-liquid will not flow back；
After S3, closing well, it is descending to carry buffer plunger 2, and after reaching undergauge position, the guide head 2-7 for carrying buffer plunger 2 is met
Stop motion is hindered, from buffer plunger 2 because effect of inertia continues traveling downwardly, itself kinetic energy is alleviated by buffer spring 2-2, until stopping
Only；
The liquid for not giving rise to surface line in S4, pit shaft is fallen after rise to single flow device 3 and from the top of buffer plunger 2, and
It is detained herein.
According to upper switch well periodic duty, the full wellbore effusion lifting of horizontal gas well is finally efficiently realized.
The technological thought of above content only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every to press
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, claims of the present invention is each fallen within
Protection domain within.
Claims (7)
1. a kind of plunger lift pumping equipment for horizontal gas well, it is characterised in that certainly slow in oil pipe (1) including being arranged on
Plunger (2) and single flow device (4) are rushed, the oil pipe (1) includes the different pipeline of two sections of calibers, and two sections of pipelines pass through reducing
Pipe nipple (3) connects, described to be arranged on from buffer plunger (2) in the oil pipe pipeline on the diameter changing nipple (3) top, the single current dress
Putting (4), there is control gas-liquid unidirectionally to flow function from bottom to top, be arranged in the oil pipe pipeline of the diameter changing nipple (3) bottom, gas
Well can rely on self-energy to lift wellbore effusion to the top of the single flow device (4) and delay, then by described from buffering
Hydrops is lifted to well head by plunger (2), completes discharge opeing production.
A kind of 2. plunger lift pumping equipment for horizontal gas well according to claim 1, it is characterised in that it is described from
Buffer plunger (2) is hollow structure, and one end is provided with the first fishing head (2-1), and the other end is provided with guide rod (2-3) and back-up ring
(2-5), some it is used to realize buffer spring (2-2) of the plunger from pooling feature, institute in described be provided with the buffer plunger (2)
State guide rod (2-3) and back-up ring (2-5) is used for the fixed support buffer spring (2-2).
3. a kind of plunger lift pumping equipment for horizontal gas well according to claim 2, it is characterised in that described
Back-up ring (2-5) and guide head (2-7) place are respectively arranged with the first spring cylindrical pin (2-4) and second spring straight pin (2-6).
4. a kind of plunger lift pumping equipment for horizontal gas well according to claim 2, it is characterised in that described
Guide rod (2-3) end set has for being buffered certainly in the guiding from buffer plunger (2) dropping process and in shaft bottom support
The guide head (2-7) of plunger (2) body.
5. a kind of plunger lift pumping equipment for horizontal gas well according to claim 4, it is characterised in that described to lead
It is hollow structure to bar (2-3).
A kind of 6. plunger lift pumping equipment for horizontal gas well according to claim 1, it is characterised in that the list
Stream device (4) includes single current valve (4-2), steel ball (4-3) and packing element (4-4), one end and second of the single current valve (4-2)
Fishing head (4-1) connects, and the other end is by the steel ball (4-3) and the hollow passageway (4-5) being arranged in the packing element (4-4)
Connection.
A kind of 7. method produced using pumping equipment described in claim 1, it is characterised in that comprise the following steps：
S1, the different oil pipe of two sections caliber connected by diameter changing nipple, will be arranged on from buffer plunger in epimere oil pipe,
Single flow device is arranged in the oil pipe of diameter changing nipple bottom；
S2, after driving a well, it is up from buffer plunger, the top hydrops of single flow device is lifted to well head, single flow device bottom upwards
Hydrops is lifted to the top of single flow device by gas self-energy；
After S3, closing well, carry that buffer plunger is descending, behind the end for reaching diameter changing nipple, the guide head for carrying buffer plunger is hampered
Stop motion, from buffer plunger because effect of inertia continues traveling downwardly, itself kinetic energy is alleviated by buffer spring, until stopping；
The liquid for not giving rise to surface line in S4, pit shaft falls top to single flow device and from buffer plunger after rise, and is trapped in
This；
S5, repeat step S2-S4 complete the full wellbore effusion lifting of horizontal gas well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710935653.2A CN107542434A (en) | 2017-10-10 | 2017-10-10 | Plunger gas lift liquid drainage device for horizontal gas well and production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710935653.2A CN107542434A (en) | 2017-10-10 | 2017-10-10 | Plunger gas lift liquid drainage device for horizontal gas well and production method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107542434A true CN107542434A (en) | 2018-01-05 |
Family
ID=60967374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710935653.2A Pending CN107542434A (en) | 2017-10-10 | 2017-10-10 | Plunger gas lift liquid drainage device for horizontal gas well and production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107542434A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108756825A (en) * | 2018-07-23 | 2018-11-06 | 西安石油大学 | A kind of swab formula water pumping gas production plunger |
| CN109184624A (en) * | 2018-11-13 | 2019-01-11 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | A kind of continuous lift ram mining device of responding curve of well formula and construction method |
| CN111058803A (en) * | 2019-12-16 | 2020-04-24 | 中国石油天然气股份有限公司 | Plunger gas lift drainage gas recovery device for combined pipe column and drainage gas recovery method thereof |
| CN111101883A (en) * | 2019-12-16 | 2020-05-05 | 中国石油天然气股份有限公司 | Underground buffering seating device suitable for horizontal well plunger gas lift and working method thereof |
| CN112696343A (en) * | 2020-12-30 | 2021-04-23 | 西南石油大学 | Shale gas horizontal well plunger lifting drainage gas production underground device and working method |
| CN113757101A (en) * | 2021-11-08 | 2021-12-07 | 西南石油大学 | Integral type components of a whole that can function independently plunger of adjustable falling speed |
| CN115234199A (en) * | 2022-07-28 | 2022-10-25 | 华北理工大学 | Horizontal well drainage gas production device and method |
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| CA2933886A1 (en) * | 2015-06-30 | 2016-12-30 | Plunger Lift Innovations, Llc | Pad plunger |
| CN106499623A (en) * | 2016-10-14 | 2017-03-15 | 中国石油天然气股份有限公司 | Production method and application of plunger with buffer and gas lift liquid drainage |
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| CN104453790A (en) * | 2013-09-12 | 2015-03-25 | 江汉视博康帕思石油技术（武汉）有限公司 | Water drainage and gas collection device with plunger |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108756825A (en) * | 2018-07-23 | 2018-11-06 | 西安石油大学 | A kind of swab formula water pumping gas production plunger |
| CN109184624A (en) * | 2018-11-13 | 2019-01-11 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | A kind of continuous lift ram mining device of responding curve of well formula and construction method |
| CN109184624B (en) * | 2018-11-13 | 2024-01-26 | 中国石油化工股份有限公司 | Well-closing-free type continuous lifting plunger drainage and extraction device and construction method |
| CN111058803A (en) * | 2019-12-16 | 2020-04-24 | 中国石油天然气股份有限公司 | Plunger gas lift drainage gas recovery device for combined pipe column and drainage gas recovery method thereof |
| CN111101883A (en) * | 2019-12-16 | 2020-05-05 | 中国石油天然气股份有限公司 | Underground buffering seating device suitable for horizontal well plunger gas lift and working method thereof |
| CN111058803B (en) * | 2019-12-16 | 2023-08-22 | 中国石油天然气股份有限公司 | Plunger gas lift drainage gas production device for combined pipe column and drainage gas production method thereof |
| CN112696343A (en) * | 2020-12-30 | 2021-04-23 | 西南石油大学 | Shale gas horizontal well plunger lifting drainage gas production underground device and working method |
| CN113757101A (en) * | 2021-11-08 | 2021-12-07 | 西南石油大学 | Integral type components of a whole that can function independently plunger of adjustable falling speed |
| CN113757101B (en) * | 2021-11-08 | 2022-01-11 | 西南石油大学 | Integral type components of a whole that can function independently plunger of adjustable falling speed |
| CN115234199A (en) * | 2022-07-28 | 2022-10-25 | 华北理工大学 | Horizontal well drainage gas production device and method |
| CN115234199B (en) * | 2022-07-28 | 2023-08-18 | 华北理工大学 | Drainage gas production device and method for horizontal well |
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Application publication date: 20180105 |
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| RJ01 | Rejection of invention patent application after publication |