CN106677753A - Downhole pipe type under-pressure oil extraction device - Google Patents
Downhole pipe type under-pressure oil extraction device Download PDFInfo
- Publication number
- CN106677753A CN106677753A CN201710110263.1A CN201710110263A CN106677753A CN 106677753 A CN106677753 A CN 106677753A CN 201710110263 A CN201710110263 A CN 201710110263A CN 106677753 A CN106677753 A CN 106677753A
- Authority
- CN
- China
- Prior art keywords
- pump barrel
- connector
- core
- docking
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000605 extraction Methods 0.000 title abstract description 5
- 210000001503 joint Anatomy 0.000 claims abstract description 11
- 238000003032 molecular docking Methods 0.000 claims description 37
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000010795 Steam Flooding Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 241000309551 Arthraxon hispidus Species 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 239000003129 oil well Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 206010053615 Thermal burn Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention relates to a downhole pipe type under-pressure oil extraction device. The downhole pipe type under-pressure oil extraction device comprises a pump barrel part (2), a plunger part (3) and a fixed ball valve (1). A connecting-tripping device (4) is arranged at the upper end of the plunger part (3) and comprises a butt joint core (41) which can be in butt joint with a plunger oil outlet connector (35). A female butt joint sleeve (48) is arranged in the position corresponding to a butt joint head (413) of the butt joint core (41). A locking sleeve (40) is arranged on the periphery of the mutual engagement joint part of the female butt joint sleeve (48) and the butt joint core (41). A pump barrel coupling (22) is arranged in the middle of a pump barrel of the pump barrel part (2) and divides the pump barrel into a lower pump barrel body (21) and an upper pump barrel body (23), and a connecting-tripping device retaining ring (46) is arranged on the pump barrel coupling (22). Compared with the prior art, the downhole pipe type under-pressure oil extraction device well solves the blowout prevention problem during steam flooding well maintenance; and especially when an oil pipe is pulled out through a sucker rod, high-temperature well liquid cannot overflow into an oil pipe string, and the effects of environmental protection and safe construction are achieved.
Description
Technical field
The present invention relates to extracting device of oil with pressure under a kind of steam flooding well, specifically a kind of steam flooding well pipe type is with pressure adopts
Oily device.
Background technology
Oil field high viscosity heavy oil block is using concentration steam drive oil production technique (i.e. SAGD DP technologies), i.e. a bite centerwell
350 DEG C of high-temperature water vapors of injection, perimeter well continuously recovers the oil, the well liquid of extraction typically more than 220 DEG C, when oil well is in inspection pump process
In, occur spraying high temperature well liquid situation from oil pipe, because the borehole pressure of oil well is high, pump detection and workover acts R a T
When, well liquid can from inside to outside overflow from tubing string, and one side operating personnel cannot operate construction near well head, easily cause people
Member scalds, there is serious hidden danger, and the well liquid on the one hand overflowed can pollute surrounding.
The method for solving at present be using kill-job Operating Pressure, the problem that Operating Pressure method is present be activity duration length,
Difficulty of construction is big, cost is high, easily causes workmen and scalds accident, pollution environment.
Therefore, when one kind can be good at solving oil well pump detection and workover, when particularly sucker rod plays flowline, high temperature well liquid
Will not overflow in tubing string, the down-hole tubular type extracting device of oil with pressure with environmental protection and construction safety, particularly a kind of pipes type steaming
Drive down-hole extracting device of oil with pressure just to arise at the historic moment.
The content of the invention
The technical problem to be solved be to provide one kind can be good at solve oil well pump detection and workover when, particularly
When sucker rod plays flowline, high temperature well liquid will not be overflowed in tubing string, and the down-hole tubular type with environmental protection and construction safety is with pressure to adopt
Oily device, particularly a kind of steam flooding well pipe type extracting device of oil with pressure.
For achieving the above object, the present invention provides following technical scheme：
The pipes type steaming of the present invention drives down-hole extracting device of oil with pressure, including pump barrel part (2), plug portion (3) and fixation
Valve ball valve (1), plug portion (3) exists including at least travelling valve ball valve A (31) and plunger delivery connection (35), its feature
In：
The upper end of described plug portion (3) is provided with on-off connector (4), the on-off connector (4), can go out with plunger comprising one
The relative docking core (41) for connecing of oily joint (35),
The docking core (41) includes core bar body (410), and the lower end of core bar body (410) is can be with plunger delivery connection (35)
The butt joint (411) of docking, upper end then for be provided with one occlusion shank (412) and docking head (413) constitute in bullet shape
Column, and be engaged between shank (412) and docking head (413) in be engaged shank (412) diameter less than docking head
(413) diameter is stepped,
Corresponding with the docking head (413) of docking core (41) to be provided with mother to female connector (48), the mother is under female connector (48)
Hold as a tubular body, tubular body be provided with from pipe middle part extend to bottom split seam (482) end of pipe is divided into it is some
Individual rosette (481), the inwall of rosette end is provided with the projection for protruding from inwall, and the projection of rosette end is formed to docking
Column in the bullet shape occlusion of core (41), female upper end to female connector (48) is provided with rod connector (49),
Core bar body (410) is provided with the block for protruding from core bar body (410) or ring A (415) with being engaged between shank (412),
Lock sleeve (40), the lock sleeve are provided with the joint portion periphery that core (41) is mutually twisted is docked to female connector (48) in mother
(40) female cylindrical body external to female connector (48) flap can be placed on for one, cylindrical body one end inwall is provided with the block of protrusion inwall
Or ring B (401), spring (42) is provided with the core bar body (410) for being provided with block or ring B (401) one end,
In the pump barrel part (2) comprising pump barrel, pump barrel box cupling (22) is provided with the middle part of pump barrel pump barrel is separated into into lower pump
Cylinder (21) and upper pump barrel (23), and pump barrel box cupling (22) place is provided with on-off connector baffle ring (46).
Further, plunger delivery connection (35) place of above-mentioned plug portion (3) is preferably provided with travelling valve ball valve B
(34)。
Yet further, described rod connector (49) lower end is provided with a cylindricality connector, and described mother is to female connector
(48) upper end is sleeve and is connected with the cylindricality connector of rod connector (49) lower end.
Yet further, the cylindricality connector bottom of described rod connector (49) lower end is preferably a tubular casing
Cylinder, the column leading section in bullet shape for docking core (41) is provided with guide portion (414) of the diameter less than docking head (413).
Yet further, described guide portion (414) front end is preferably tapered.
Compared with prior art, the blowout prevention when present invention solves the problems, such as that steam flooding well is safeguarded well, particularly in oil pumping
When bar plays flowline, high temperature well liquid will not be overflowed in tubing string, the effect with environmental protection and construction safety, it is adaptable to various oil wells
Down-hole oil recovery with pressure, is particularly well-suited to oil recovery with pressure under steam flooding well.
Description of the drawings
Accompanying drawing 1 is the structural representation of the embodiment of the present invention 1.
Accompanying drawing 2 is the structural representation that the on-off connector of the embodiment of the present invention 1 decomposes.
Accompanying drawing 3 is the structural representation of the standing valve cover of the embodiment of the present invention 1.
Accompanying drawing 4 is the structural representation of the plunger delivery connection of the embodiment of the present invention 1.
Accompanying drawing 5 is the structural representation of the jump ring of the embodiment of the present invention 1.
Accompanying drawing 6 is the structural representation of the lock sleeve of the embodiment of the present invention 1.
Accompanying drawing 7 is structural representation of the mother of the embodiment of the present invention 1 to female connector.
Accompanying drawing 8 is closed mode schematic diagram when the sucker rod of the embodiment of the present invention 1 rises.
Accompanying drawing 9 is the working state schematic representation when embodiment of the present invention 1 is recovered the oil.
Shown in figure：1 is standing valve ball valve, and 11 is standing valve ball, and 12 is standing valve cover, and 13 connect for standing valve
Head, 14 is standing valve seat, and 15 is standing valve core bar, and 16 is standing valve core bar spring, and 2 is pump barrel part, and 21 is lower pump
Cylinder, 22 is pump barrel box cupling, and 23 is upper pump barrel, and 24 is box cupling on pump barrel, and 25 is box cupling under pump barrel, and 3 are plug portion, and 31 are trip
Dynamic valve ball valve A, 32 is plunger, and 33 is plunger short circuit, and 34 is travelling valve ball valve B, and 35 is plunger delivery connection, and 4 is uncoupling
Device, 40 is lock sleeve, and 401 is block or ring B, and 41 are docking core, and 410 is core bar body, and 411 is butt joint, and 412 are occlusion shin
Portion, 413 are docking head, and 414 is guide portion, and 415 is block or ring A, and 42 is spring, and 43 is jump ring retainer ring, and 44 is jump ring,
45 is O-ring seal, and 46 is on-off connector baffle ring, and 47 is on-off connector baffle ring standby cap, and 48 is female to female connector, and 481 is rosette, and 482 are
Seam is split, 49 is rod connector, and 5 is sucker rod.
Specific embodiment
The following detailed description of the preferred embodiment of the present invention.
Embodiment 1：Reference picture 1-9, is the structural representation of the embodiment of the present invention 1, including pump barrel part 2, plug portion 3
With standing valve ball valve 1, pump barrel part 2 includes box cupling 25 under box cupling 24, pump barrel on pump barrel 21, pump barrel, is provided with the middle part of pump barrel
Pump barrel is separated at lower pump barrel 21 and upper pump barrel 23, and pump barrel box cupling 22 and is provided with on-off connector baffle ring 46 by pump barrel box cupling 22.Post
Plug portion 3 sets including at least travelling valve ball valve A31 and plunger delivery connection 35 at the plunger delivery connection 35 of plug portion 3
There is travelling valve ball valve B34.The upper end of the plunger delivery connection 35 of described plug portion 3 is provided with on-off connector 4, the on-off connector 4,
Comprising a docking core 41 that relative with plunger delivery connection 35 can be connect, the docking core 41 includes core bar body 410, core bar body
410 lower end is the butt joint 411 that can be docked with plunger delivery connection 35, and upper end is then engaged the He of shank 412 to be provided with one
The column in bullet shape of the docking composition of head 413, and it is in be engaged shank to be engaged between shank 412 and docking head 413
412 diameters are stepped less than the docking diameter of head 413, corresponding with the docking head 413 of docking core 41 to be provided with mother to female connector
48, the mother is a tubular body to the lower end of female connector 48, and tubular body is provided with the seam 482 of splitting for extending to bottom from pipe middle part will pipe
The end be divided into several rosettes 481, the inwall of rosette end to be provided with the projection for protruding from inwall, rosette end
Projection forms the occlusion of the column in bullet shape to docking core 41, and female upper end to female connector 48 is provided with rod connector 49,
Core bar body 410 be provided with the block for protruding from core bar body 410 or ring A415 with being engaged between shank 412, mother to female connector 48 with
The joint portion periphery that docking core 41 is mutually twisted is provided with lock sleeve 40, and the lock sleeve 40 can be placed on mother to the flap of female connector 48 for one
External cylindrical body, cylindrical body one end inwall is provided with the block or ring B401 of protrusion inwall, is being provided with block or ring B401 one end
Core bar body 410 be provided with spring 42, the described lower end of rod connector 49 is provided with a cylindricality connector, and described mother is to female connector
48 upper end is sleeve and is connected with the cylindricality connector of the lower end of rod connector 49.The post of the described lower end of rod connector 49
Shape connector bottom is a tubular sleeve, and the column leading section in bullet shape for docking core 41 is provided with diameter less than butt joint
The guide portion 414 in portion 413.The described front end of guide portion 414 is tapered.
The course of work of the present invention is as follows：When going into the well, under push away sucker rod 5, by sucker rod 5 by the mother being attached thereto to female connector
Push away under 48 and dock with core 41 is docked, jump ring 44 is stuck in the cannelure of pump barrel box cupling 22, lock sleeve 40 and O-ring seal 45, pump
Sealing state is between cylinder box cupling 22, sucker rod 5 is pushed away under continuation, lock sleeve 40 departs from into pump barrel box cupling with pump barrel box cupling 22
In the lower pump barrel 21 of 22 lower sections, into working condition, as shown in Figure 9.
When playing pump, sucker rod 5 is above carried, the docking core 41 for the mother being attached thereto being docked to female connector 48 by sucker rod 5 and post
Plug system is pulled into the sealing state of diagram, carries de- while sucker rod makes female up to the drive docking core 41 of female connector 48 in continuation
From lock sleeve 40, when in pump barrel 23 in entrance, mother loses the constraint of lock sleeve 40 to female connector 48, departs from core 41 is docked, post
Plug system departs from sucker rod 5, and sealing state is between lock sleeve 40 and pump barrel box cupling 22, effectively prevents lower well hydrorrhea from going out,
As shown in Figure 8.
Above-described is only the preferred embodiment of the present invention, it is noted that for one of ordinary skill in the art
For, without departing from the concept of the premise of the invention, some changes and improvements can also be made, these belong to the present invention
Protection domain.
Claims (7)
1. a kind of down-hole tubular type extracting device of oil with pressure, including pump barrel part (2), plug portion (3) and standing valve ball valve (1),
Plug portion (3) is including at least travelling valve ball valve A (31) and plunger delivery connection (35), it is characterised in that：
The upper end of described plug portion (3) is provided with on-off connector (4), the on-off connector (4), fuel-displaced with plunger can connect comprising one
The relative docking core (41) for connecing of head (35), the docking core (41) includes core bar body (410), and the lower end of core bar body (410) is can
The butt joint (411) docked with plunger delivery connection (35), upper end is then engaged shank (412) and docking head to be provided with one
(413) column in bullet shape of composition, and it is in be engaged shank to be engaged between shank (412) and docking head (413)
(412) diameter is stepped less than docking head (413) diameter；
Corresponding with the docking head (413) of docking core (41) to be provided with mother to female connector (48), the mother is to the lower end of female connector (48)
One tubular body, tubular body is provided with the seam (482) of splitting for extending to bottom from pipe middle part and the end of pipe is divided into into several lobes
Shape body (481), the inwall of rosette end is provided with the projection for protruding from inwall, and the projection of rosette end is formed to docking core
(41) the occlusion of the column in bullet shape, female upper end to female connector (48) is provided with rod connector (49)；
The core bar body (410) is provided with the block for protruding from core bar body (410) or ring A (415) with being engaged between shank (412),
Lock sleeve (40) is provided with the joint portion periphery that core (41) is mutually twisted is docked to female connector (48) in mother, the lock sleeve (40) is one
Female cylindrical body external to female connector (48) flap can be placed on, cylindrical body one end inwall is provided with the block or ring B of protrusion inwall
(401), it is provided with spring (42) on the core bar body (410) for being provided with block or ring B (401) one end；
In the pump barrel part (2) comprising pump barrel, pump barrel box cupling (22) is provided with the middle part of pump barrel pump barrel is separated into into lower pump barrel
And upper pump barrel (23), and pump barrel box cupling (22) place is provided with on-off connector baffle ring (46) (21).
2. down-hole tubular type according to claim 1 extracting device of oil with pressure, it is characterised in that：Described plug portion (3)
Plunger delivery connection (35) place is provided with travelling valve ball valve B (34).
3. down-hole tubular type according to claim 1 and 2 extracting device of oil with pressure, it is characterised in that：Described rod connector
(49) lower end is provided with a cylindricality connector, described mother be to the upper end of female connector (48) sleeve and with rod connector (49) lower end
Cylindricality connector connection.
4. down-hole tubular type according to claim 1 and 2 extracting device of oil with pressure, it is characterised in that：Described rod connector
(49) the cylindricality connector bottom of lower end is a tubular sleeve, and the column leading section in bullet shape for docking core (41) is provided with
Guide portion (414) of the diameter less than docking head (413).
5. down-hole tubular type according to claim 4 extracting device of oil with pressure, it is characterised in that：Before described guide portion (414)
End is tapered.
6. down-hole tubular type according to claim 3 extracting device of oil with pressure, it is characterised in that：Described rod connector (49)
The cylindricality connector bottom of lower end is a tubular sleeve, and the column leading section in bullet shape for docking core (41) is provided with diameter
Less than the guide portion (414) of docking head (413).
7. down-hole tubular type according to claim 6 extracting device of oil with pressure, it is characterised in that：Before described guide portion (414)
End is tapered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710110263.1A CN106677753A (en) | 2017-02-28 | 2017-02-28 | Downhole pipe type under-pressure oil extraction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710110263.1A CN106677753A (en) | 2017-02-28 | 2017-02-28 | Downhole pipe type under-pressure oil extraction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106677753A true CN106677753A (en) | 2017-05-17 |
Family
ID=58861517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710110263.1A Pending CN106677753A (en) | 2017-02-28 | 2017-02-28 | Downhole pipe type under-pressure oil extraction device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106677753A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868586A (en) * | 2018-08-21 | 2018-11-23 | 曾卫林 | Blade-free mud motor |
| CN115749701A (en) * | 2022-12-06 | 2023-03-07 | 山东威马泵业股份有限公司 | Blowout-preventing pipe type oil well pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4776401A (en) * | 1987-08-17 | 1988-10-11 | Otis Engineering Corporation | Foot valve for pumping wells |
| CN2407159Y (en) * | 1999-11-17 | 2000-11-22 | 中国石化集团河南石油勘探局采油工艺研究所 | Rod oil sucker against blowout |
| CN2743527Y (en) * | 2004-11-15 | 2005-11-30 | 祝兆清 | Lock block type oil pumping rod relieve and joining device |
| CN201024915Y (en) * | 2007-03-29 | 2008-02-20 | 大庆油田有限责任公司 | Jet preventive connecting-tripping device |
| CN201184137Y (en) * | 2008-03-14 | 2009-01-21 | 梁伟成 | Novel blowout prevention connecting-tripping device |
| CN101413382A (en) * | 2007-10-17 | 2009-04-22 | 梁伟成 | Blowout prevention on-off connector |
| CN201521259U (en) * | 2009-09-16 | 2010-07-07 | 卫宇乾 | Blowout preventing interlocking type clamping jaw connecting-tripping device |
| CN202731772U (en) * | 2012-07-23 | 2013-02-13 | 中国石油天然气股份有限公司 | Clamping and supporting ring control suspension type blowout prevention connecting-tripping device |
| US20130153796A1 (en) * | 2011-05-26 | 2013-06-20 | Southwest Petroleum University | Underground Annular Blowout Preventer and Assembly Process Thereof |
| CN105952410A (en) * | 2016-07-15 | 2016-09-21 | 克拉玛依胜利高原机械有限公司 | Underground blockage device of casing pressure balanced working method |
-
2017
- 2017-02-28 CN CN201710110263.1A patent/CN106677753A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4776401A (en) * | 1987-08-17 | 1988-10-11 | Otis Engineering Corporation | Foot valve for pumping wells |
| CN2407159Y (en) * | 1999-11-17 | 2000-11-22 | 中国石化集团河南石油勘探局采油工艺研究所 | Rod oil sucker against blowout |
| CN2743527Y (en) * | 2004-11-15 | 2005-11-30 | 祝兆清 | Lock block type oil pumping rod relieve and joining device |
| CN201024915Y (en) * | 2007-03-29 | 2008-02-20 | 大庆油田有限责任公司 | Jet preventive connecting-tripping device |
| CN101413382A (en) * | 2007-10-17 | 2009-04-22 | 梁伟成 | Blowout prevention on-off connector |
| CN201184137Y (en) * | 2008-03-14 | 2009-01-21 | 梁伟成 | Novel blowout prevention connecting-tripping device |
| CN201521259U (en) * | 2009-09-16 | 2010-07-07 | 卫宇乾 | Blowout preventing interlocking type clamping jaw connecting-tripping device |
| US20130153796A1 (en) * | 2011-05-26 | 2013-06-20 | Southwest Petroleum University | Underground Annular Blowout Preventer and Assembly Process Thereof |
| CN202731772U (en) * | 2012-07-23 | 2013-02-13 | 中国石油天然气股份有限公司 | Clamping and supporting ring control suspension type blowout prevention connecting-tripping device |
| CN105952410A (en) * | 2016-07-15 | 2016-09-21 | 克拉玛依胜利高原机械有限公司 | Underground blockage device of casing pressure balanced working method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868586A (en) * | 2018-08-21 | 2018-11-23 | 曾卫林 | Blade-free mud motor |
| CN108868586B (en) * | 2018-08-21 | 2024-02-09 | 曾卫林 | Blade-free underground power drilling tool |
| CN115749701A (en) * | 2022-12-06 | 2023-03-07 | 山东威马泵业股份有限公司 | Blowout-preventing pipe type oil well pump |
| CN115749701B (en) * | 2022-12-06 | 2023-11-17 | 山东威马泵业股份有限公司 | Blowout prevention pipe type oil pump |
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