CN110821451B - A tool of going into well for bypass screen pipe - Google Patents
A tool of going into well for bypass screen pipe Download PDFInfo
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- CN110821451B CN110821451B CN201810919879.8A CN201810919879A CN110821451B CN 110821451 B CN110821451 B CN 110821451B CN 201810919879 A CN201810919879 A CN 201810919879A CN 110821451 B CN110821451 B CN 110821451B
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- sieve tube
- ball
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- 230000007246 mechanism Effects 0.000 claims abstract description 95
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000004576 sand Substances 0.000 description 6
- 238000012856 packing Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005096 rolling process Methods 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
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- 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)
- Earth Drilling (AREA)
Abstract
The invention discloses a well running tool for a bypass screen pipe, and relates to the field of oilfield equipment. The downhole tool includes: the screen pipe clamping device comprises a main body, a door body, a ball mechanism and a screen pipe clamping mechanism, wherein the main body is provided with a hoisting mechanism and an opening for enabling a bypass screen pipe to enter and exit; when the sieve tube clamping mechanism works, the main body is matched with the door body to form an annular inner cavity, the ball mechanism and the sieve tube clamping mechanism are both arranged in the annular inner cavity, and the ball mechanism is used for assisting the sieve tube clamping mechanism to rotate relative to the annular inner cavity; the screen pipe holding mechanism is provided with a holding cavity matched with the outline of the bypass screen pipe. The bypass sieve tube is tightly held by the sieve tube holding mechanism. The hoisting mechanism is connected with the hoisting ring of the hook, so that the hoisting mechanism can be lowered into a shaft, and then the bypass sieve tube is rotated to realize underground connection.
Description
Technical Field
The invention relates to the field of oilfield equipment, in particular to a well descending tool for a bypass screen pipe.
Background
The bypass screen pipe gravel packing sand control process is suitable for long-packed well sections and horizontal well gravel packing sand control, wherein the bypass screen pipe gravel packing sand control process adopts a bypass screen pipe (also called bypass shunt screen pipe or bypass), and a plurality of bypass pipes with smaller volume are laid outside a traditional screen pipe to provide a flow channel for mortar to bypass an early annular sand bridge, so that the problem that the horizontal well and long well sections are not densely packed or the early sand bridge is generated is solved, and the gravel packing sand control effect can be fully ensured.
In view of the above-mentioned structure of the bypass screen, it is necessary to provide a downhole tool, which can be smoothly run into the wellbore and achieve downhole connection.
Disclosure of Invention
In view of the above, the present invention provides a downhole tool for a bypass screen, which can solve the above technical problems. Specifically, the method comprises the following technical scheme:
a downhole tool for a bypass screen, the downhole tool comprising: the screen pipe clamping mechanism comprises a main body, a door body, a ball mechanism and a screen pipe clamping mechanism;
the main body is provided with a hoisting mechanism and an opening for the bypass sieve tube to pass in and out, and the door body is connected with the main body and used for plugging the opening;
when the sieve tube clamping mechanism works, the main body is matched with the door body to form an annular inner cavity, the ball mechanism and the sieve tube clamping mechanism are both arranged in the annular inner cavity, and the ball mechanism is used for assisting the sieve tube clamping mechanism to rotate relative to the annular inner cavity;
the screen pipe clamping mechanism is provided with a clamping cavity matched with the outline of the bypass screen pipe.
In one possible implementation, the ball mechanism and the screen clasping mechanism each include: the first part is arranged in the inner cavity part of the annular inner cavity corresponding to the main body, and the second part is arranged in the inner cavity part of the annular inner cavity corresponding to the door body;
the hug closely the chamber and include: the sieve tube cavity is used for accommodating the sieve tube body of the bypass sieve tube, and the bypass cavity is used for accommodating a bypass tube of the bypass sieve tube;
the bypass cavity is disposed in the first portion of the annular cavity.
In one possible implementation, the hoisting mechanism comprises: and the two hook grooves are symmetrically arranged on the outer wall of the main body and used for hanging the hanging ring of the large hook.
In a possible implementation manner, a stopping piece is arranged at the notch of the hook groove and used for stopping the hanging ring in the hook groove.
In one possible implementation manner, one end of the door body is hinged with the main body;
the downhole tool further comprises: and the fastening piece is used for fixing the other end of the door body on the main body.
In a possible implementation manner, the door body is further provided with a handle.
In a possible implementation manner, an annular step surface is arranged on the upper part of the inner wall of the annular inner cavity;
the ball mechanism includes: the annular limiting groove is arranged on the annular step surface, and the plurality of balls are rotatably arranged in the annular limiting groove;
the lower surface of the ball is in contact with the annular step surface, and the upper surface of the ball is in contact with the sieve tube clasping mechanism.
In a possible implementation manner, the annular step surface is provided with an inner ring annular baffle and an outer ring annular baffle, and a gap between the inner ring annular baffle and the outer ring annular baffle forms the annular limiting groove.
In one possible implementation, the screen clasping mechanism comprises: the body is held tightly;
the annular baffle is arranged at the outer periphery of the upper end of the enclasping body;
the upper end of the main body is provided with an annular baffle groove, and the annular baffle plate is rotatably limited in the annular baffle groove.
In a possible implementation manner, a circle of annular groove is further arranged at the outer periphery of the lower end of the enclasping body;
the ball mechanism is accommodated in an annular cavity formed by matching the annular groove and the annular step surface, and the upper surface of the ball is contacted with the top wall of the annular groove.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the well-descending tool provided by the embodiment of the invention, the bypass screen pipe enters the inner cavity of the main body from the opening of the main body, then the opening is blocked by the door body, the bypass screen pipe is limited in the radial direction, and the bypass screen pipe is held tightly by the screen pipe holding mechanism. The hoisting mechanism on the main body is connected with the hoisting ring of the oilfield operation hook, the bypass sieve pipe can be lowered into a target position in a shaft through the well descending tool, then the bypass sieve pipe can be connected in a well by rotating the bypass sieve pipe, in the rotating process, the sieve pipe clamping mechanism and the bypass sieve pipe rotate together, and the ball mechanism assists in rotating, so that the rotating process of the bypass sieve pipe is more labor-saving, the underground connection of the bypass sieve pipe can be smoothly realized, and therefore the hoisting mechanism has important significance for the quick underground connection of the heavy bypass sieve pipe.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a downhole tool for a bypass screen provided in accordance with an embodiment of the present invention;
FIG. 2 is a top view of a downhole tool for a bypass screen provided in accordance with an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of a downhole tool provided in accordance with an embodiment of the present invention.
The reference numerals denote:
1-a main body, 2-a door body, 3-a ball mechanism, 4-a sieve tube holding mechanism, 5-a hoisting mechanism and 6-a holding cavity,
7-blocking piece, 8-fastener, 9-handle, 10-annular step surface,
31-an annular limiting groove, 32-a ball,
41-holding body, 42-annular baffle and 43-annular groove.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
It should be noted that a bypass screen according to an embodiment of the present invention includes: the screen pipe body to and be a bypass pipe that sets up on the screen pipe body outer wall at interval in proper order along the axial, the inner chamber of bypass pipe and screen pipe body switches on. Also, the top of the bypass screen is typically provided with a collar having a radial width greater than the radial width of the gripping chamber (provided by the screen gripping mechanism) of the downhole tool provided by embodiments of the present invention so that the bypass screen may eventually seat on the top of the downhole tool.
In addition, the "work station" referred to below refers to the operational state of the running tool when running and connecting the bypass screen in the well.
In view of the bypass screen, embodiments of the present invention provide a downhole tool for a bypass screen, as shown in fig. 1 and 2, the downhole tool comprising: the screen pipe clamping device comprises a main body 1, a door body 2, a ball mechanism 3 and a screen pipe clamping mechanism 4. The main body 1 is provided with a hoisting mechanism 5 and an opening for the bypass screen to enter and exit, and the door body 2 is connected with the main body 1 and used for plugging the opening. When the sieve tube clamping mechanism works, the main body 1 and the door body 2 are matched to form an annular inner cavity, the ball mechanism 3 and the sieve tube clamping mechanism 4 are both arranged in the annular inner cavity, and the ball mechanism 3 is used for assisting the sieve tube clamping mechanism 4 to rotate relative to the annular inner cavity; the screen pipe holding mechanism 4 is provided with a holding cavity 6 matched with the outline of the bypass screen pipe.
When the bypass screen pipe is applied, the bypass screen pipe enters the inner cavity of the main body 1 from the opening of the main body, then the door body 2 is used for plugging the opening, the bypass screen pipe is limited in the radial direction, and the bypass screen pipe is tightly held by the screen pipe tightly holding mechanism 4. The hoisting mechanism 5 on the main body 1 is connected with the hoisting ring of the oilfield operation hook, the bypass sieve pipe can be lowered into a target position in a shaft through the well descending tool, then the bypass sieve pipe can be connected in a well by rotating the bypass sieve pipe, in the rotating process, the sieve pipe clamping mechanism 4 rotates together with the bypass sieve pipe, and the ball mechanism 3 assists in rotating, so that the rotating process of the bypass sieve pipe is more labor-saving, the underground connection of the bypass sieve pipe can be smoothly realized, and therefore the hoisting mechanism has important significance for the quick underground connection of the heavy bypass sieve pipe.
As will be appreciated by those skilled in the art, since the hugging chamber 6 is adapted to the profile of the bypass screen, i.e. whereas the hugging chamber 6 comprises: the sieve tube body is used for accommodating the sieve tube body of the bypass sieve tube, and the bypass cavity of the bypass tube is used for accommodating the bypass sieve tube, and the bypass cavity is radially and outwards positioned at one side of the sieve tube cavity, so that the bypass sieve tube can rotate together with the sieve tube clasping mechanism 4 when rotating, and the bypass sieve tube and the sieve tube clasping mechanism cannot rotate relatively.
Considering that the door body 2 is independent with respect to the main body 1, this means that, when in the non-operating position, the two can be separated, and thus the annular cavity formed by the main body 1 and the door body 2 being matched is also separated into two corresponding parts, one part is the main body cavity part corresponding to the main body 1, the other part is the door body cavity part corresponding to the door body 2, and the main body cavity part and the door body cavity part are matched to form the annular cavity when in the operating position.
As can be seen from the above, the ball mechanism 3 and the screen pipe clasping mechanism 4 each include: set up in the inside first part of the inner chamber part that the annular cavity corresponds main part 1 to and, set up in the inside second part of the inner chamber part that the annular cavity corresponds door body 2, and hold chamber 6 tightly and include: a screen cavity for receiving the screen body of the bypass screen, and a bypass cavity for receiving a bypass pipe of the bypass screen. Considering that the bypass cavity is a branch cavity of the clasping cavity 6, the bypass cavity can be arranged on the first part of the screen clasping mechanism 4 for the convenience of manufacturing the downhole tool.
As an example of the hoisting mechanism 5, as shown in fig. 1, the hoisting mechanism 5 according to the embodiment of the present invention includes: two hook grooves symmetrically arranged on the outer wall of the main body 1 are used for hanging the hanging ring of the big hook. The structure of hook groove and the structure looks adaptation of rings ensure that rings can hang into to it can to hoist main part 1.
In a possible example, two lifting portions can be symmetrically arranged on the outer wall of the main body 1 outwards along the radial direction, and a hook groove which is communicated up and down is arranged in the side wall of the lifting portion, and the side part of the hook groove is used for enabling the lifting ring to enter and exit, and is used as the lifting mechanism 5.
The hook groove is communicated up and down, the side part of the hook groove is provided with a notch for enabling the hanging ring to pass in and out, in order to enable the lifting process to be stable and safe, furthermore, as shown in the attached drawing 1, a blocking piece 7 can be arranged at the notch of the hook groove, and the hanging ring in the hook groove can be blocked by the blocking piece 7 to prevent the hanging ring from withdrawing from the hook groove.
The stopper 7 may be, for example, a stopper rod or a stopper plate, which may be longitudinally passed through and fixed in the body 1, or fixed on an end surface of the body 1 for the purpose of stopping the notch of the hooking groove. In a possible realisation, the stop 7 is a stop rod which is threaded through a longitudinal hole in the body 1 to be fixed in the body 1.
In the embodiment of the present invention, the door body 2 may be independently disposed with respect to the main body 1, or may be always connected to the main body 1, and in view of convenience in operation, the door body 2 may be always connected to the main body 1, and in view of this, one end of the door body 2 may be hinged to the main body 1, and in this case, as shown in fig. 1 and 2, the downhole tool further includes: and a fastening member 8 for fixing the other end of the door body 2 to the main body 1. When in use, the door body 2 is rotated relative to the main body 1 to realize opening and closing, and the fastening piece 8 is used for ensuring that the door body 2 is fixed relative to the main body 1 at the working position.
The hinge joint of the door body 2 and the main body 1 can be realized by a hinge shaft, so that the door body 2 can be rotatably connected to the main body 1.
As an example, the fastening member 8 may be a pin, wherein the door body 2 and the main body 1 are provided with correspondingly conducted pin holes, and the pin is inserted into the pin holes along the longitudinal direction. For example, the middle of the door body 2 can be provided with an accommodating groove, and the position of the main body 1 corresponding to the accommodating groove is extended to be provided with a locking block, when the door body 2 is closed, the locking block on the main body 1 can just enter the accommodating groove, and the pin hole is longitudinally arranged on the locking block on the door body 2 and the main body 1.
In order to facilitate opening and closing of the door body 2, as shown in fig. 1 and fig. 2, a handle 9 may be further disposed on the door body 2, wherein the handle 9 may be a cylinder structure with an end perpendicular to an outer side wall of the door body 2, or may be an arc structure, and the embodiment of the present invention is not specifically limited herein.
Above mentioned, the rotation of the screen clasping mechanism 4 is assisted by the ball mechanism 3, and for the structure and arrangement of the ball mechanism 3, an example is given below:
as shown in fig. 3, an annular step surface 10 is provided on an upper portion of an inner wall of the annular inner cavity, and the ball mechanism 3 includes: the sieve tube clamping mechanism comprises an annular limiting groove 31 arranged on the annular step surface 10 and a plurality of balls 32 rotatably arranged in the annular limiting groove 31, wherein the lower surfaces of the balls 32 are in contact with the annular step surface 10, and the upper surfaces of the balls are in contact with the sieve tube clamping mechanism 4. The annular step surface 10 is provided to support the ball mechanism 3, wherein the balls 32 are distributed in the annular limiting groove 31 and can rotate therein. Because the upper surface of ball 32 contacts with screen pipe clasping mechanism 4, when screen pipe clasping mechanism 4 rotates and makes, can utilize the roll of ball 32 to show and reduce rolling friction, and then make the rotation process of bypass screen pipe more laborsaving. It will be appreciated that the diameter of the ball 32 is greater than the depth of the annular retainer groove 31 so that its upper surface is able to make sliding contact with the screen clasping mechanism 4.
The annular limiting groove 31 may be prepared by directly grooving the annular step surface 10, or by providing a baffle on the annular step surface 10, for example, an inner ring of the annular baffle 42 and an outer ring of the annular baffle 42 may be provided on the annular step surface 10, and a gap between the inner ring of the annular baffle 42 and the outer ring of the annular baffle 42 forms the annular limiting groove 31.
The inner ring annular baffle 42 and the outer ring annular baffle 42 can be inserted into corresponding inner ring slot and outer ring slot on the annular step surface 10 to realize detachable connection of the two.
Further, the following is an example of how the screen holding mechanism 4 can be rotatably disposed in the annular inner cavity and simultaneously contact the ball mechanism 3:
as shown in fig. 3, the screen clamping mechanism 4 includes: the clasping body 41; and an annular baffle 42 arranged at the outer periphery of the upper end of the clasping body 41. Wherein, the upper end of the main body 1 is provided with an annular baffle groove, and the annular baffle 42 is rotatably limited in the annular baffle groove. The screen holding mechanism 4 is rotatably arranged in the annular inner cavity through the matching of the annular baffle plate 42 and the annular baffle groove. The annular baffle 42 and the clasping body 41 have a slot with a downward opening therebetween to accommodate the sidewall of the annular baffle slot, that is, during installation, the annular baffle 42 is inserted into the annular baffle slot.
As can be seen from the above, the screen clamping mechanism 4 and the ball mechanism 3 are both disposed in the annular inner cavity, and in order to prevent the interference between the two mechanisms and simultaneously enable the balls 32 to contact the screen clamping mechanism 4, as shown in fig. 1, a circle of annular slot 43 may be disposed at the outer periphery of the lower end of the clamping body 41, the ball mechanism 3 is accommodated in the annular cavity formed by the annular slot 43 and the annular step surface 10, and the upper surface of the ball 32 contacts the top wall of the annular slot 43.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A downhole tool for a bypass screen, the downhole tool comprising: the screen pipe clamping device comprises a main body (1), a door body (2), a ball mechanism (3) and a screen pipe clamping mechanism (4);
the main body (1) is provided with a hoisting mechanism (5) and an opening for the bypass sieve tube to enter and exit, and the door body (2) is connected with the main body (1) and used for plugging the opening;
when the sieve tube clamping device works, the main body (1) and the door body (2) are matched to form an annular inner cavity, the ball mechanism (3) and the sieve tube clamping mechanism (4) are arranged in the annular inner cavity, the ball mechanism (3) is used for assisting the sieve tube clamping mechanism (4) to rotate relative to the annular inner cavity, and an annular step surface (10) is arranged on the upper portion of the inner wall of the annular inner cavity;
the ball mechanism (3) includes: an annular limiting groove (31) arranged on the annular step surface (10), and a plurality of balls (32) rotatably arranged in the annular limiting groove (31);
the lower surface of the ball (32) is in contact with the annular step surface (10), the upper surface of the ball is in contact with the sieve tube clasping mechanism (4), and the diameter of the ball (32) is larger than the depth of the annular limiting groove (31), so that the surface of the ball (32) at the upper part can be in sliding contact with the sieve tube clasping mechanism (4);
the screen pipe clamping mechanism (4) is provided with a clamping cavity (6) matched with the outline of the bypass screen pipe.
2. A well tool for a bypass screen according to claim 1, characterized in that the ball mechanism (3) and the screen hugging mechanism (4) each comprise: the first part is arranged in the inner cavity part of the annular inner cavity corresponding to the main body (1), and the second part is arranged in the inner cavity part of the annular inner cavity corresponding to the door body (2);
the hugging cavity (6) comprises: the sieve tube cavity is used for accommodating the sieve tube body of the bypass sieve tube, and the bypass cavity is used for accommodating a bypass tube of the bypass sieve tube;
the bypass cavity is disposed in the first portion of the annular cavity.
3. A well tool for a bypass screen according to claim 1, characterized in that the hoisting mechanism (5) comprises: the two hook grooves are symmetrically arranged on the outer wall of the main body (1) and used for hanging the hanging ring of the large hook.
4. A well tool for a bypass screen according to claim 3, characterized in that a stop (7) is arranged at the notch of the hook groove for stopping the hoisting ring in the hook groove.
5. A well tool for a bypass screen according to claim 1, characterized in that one end of the door (2) is hinged to the body (1);
the downhole tool further comprises: and the fastening piece (8) is used for fixing the other end of the door body (2) on the main body (1).
6. A well tool for a bypass screen according to claim 5, characterized in that the door (2) is further provided with a handle (9).
7. The well tool for a bypass screen according to claim 1, characterized in that the annular step surface (10) is provided with an inner ring and an outer ring of annular baffles (42), and a gap between the inner ring of annular baffles (42) and the outer ring of annular baffles (42) forms the annular limiting groove (31).
8. A well tool for a bypass screen according to claim 1, characterized in that the screen hugging mechanism (4) comprises: a clasping body (41);
an annular baffle plate (42) arranged at the outer periphery of the upper end of the enclasping body (41);
the upper end of the main body (1) is provided with an annular blocking groove, and the annular blocking plate (42) is rotatably limited in the annular blocking groove.
9. A well tool for a bypass screen according to claim 8, characterized in that a ring of annular slots (43) is further provided at the lower outer periphery of the hugging body (41);
the ball mechanism (3) is accommodated in an annular cavity formed by matching the annular groove (43) with the annular step surface (10), and the upper surface of the ball (32) is in contact with the top wall of the annular groove (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810919879.8A CN110821451B (en) | 2018-08-14 | 2018-08-14 | A tool of going into well for bypass screen pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810919879.8A CN110821451B (en) | 2018-08-14 | 2018-08-14 | A tool of going into well for bypass screen pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110821451A CN110821451A (en) | 2020-02-21 |
| CN110821451B true CN110821451B (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810919879.8A Active CN110821451B (en) | 2018-08-14 | 2018-08-14 | A tool of going into well for bypass screen pipe |
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| Country | Link |
|---|---|
| CN (1) | CN110821451B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4275488A (en) * | 1979-01-04 | 1981-06-30 | Gray Charles E | Combined well casing spider and elevator |
| CN101210484A (en) * | 2006-12-31 | 2008-07-02 | 安善堂 | Elevator rotor equipment for repairing well |
| CN201326390Y (en) * | 2008-09-24 | 2009-10-14 | 中国石油化工股份有限公司中原油田分公司采油一厂 | Single-head sucker rod elevator with replaceable crescent |
| CN202788697U (en) * | 2012-06-01 | 2013-03-13 | 中国石油天然气集团公司 | Turnplate device |
-
2018
- 2018-08-14 CN CN201810919879.8A patent/CN110821451B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4275488A (en) * | 1979-01-04 | 1981-06-30 | Gray Charles E | Combined well casing spider and elevator |
| CN101210484A (en) * | 2006-12-31 | 2008-07-02 | 安善堂 | Elevator rotor equipment for repairing well |
| CN201326390Y (en) * | 2008-09-24 | 2009-10-14 | 中国石油化工股份有限公司中原油田分公司采油一厂 | Single-head sucker rod elevator with replaceable crescent |
| CN202788697U (en) * | 2012-06-01 | 2013-03-13 | 中国石油天然气集团公司 | Turnplate device |
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| CN110821451A (en) | 2020-02-21 |
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