CN101429856B - Hydraulic pliers - Google Patents
Hydraulic pliers Download PDFInfo
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- CN101429856B CN101429856B CN200810012726A CN200810012726A CN101429856B CN 101429856 B CN101429856 B CN 101429856B CN 200810012726 A CN200810012726 A CN 200810012726A CN 200810012726 A CN200810012726 A CN 200810012726A CN 101429856 B CN101429856 B CN 101429856B
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Abstract
The invention relates to an oil field well workover treatment tool, in particular to hydraulic tongs capable of realizing the automatic loading/unloading of an oil pipe and a sucker rod. The hydraulic tongs comprise main tongs, back tongs, a high-low-speed gear shift mechanism and a connecting support. The back tongs are arranged on the connecting support; the main tongs are positioned above the back tongs and are connected with the back tongs through a guide bar; and the main tongs can reciprocate up and down along the guide bar. The high-low-speed gear shift mechanism is arranged on the main tongs; the output end of the high-low-speed gear shift mechanism is connected with a gear shift device inside the main tongs; and the high-low-speed gear shift mechanism is also connected with a hydraulic control module. The hydraulic tongs are connected with a hydraulic tongs telescopic bracket of the machine body of the well workover machine through the connecting support. The hydraulic tongs are driven by the telescopic bracket to realize automatic telescoping, thereby freeing operators from a dangerous operating environment. Automatic operation is realized for the loading/unloading of the hydraulic tongs, thereby not only reducing the labor intensity of workers, but also avoiding possible accidental injury of workers during the operation.
Description
Technical field
The present invention relates to the oil well repairing operation instrument, specifically a kind of oil pipe and sucker rod realized gone up the hydraulic tongs of shackle automatically.
Background technology
In the oil well workover process, a large amount of work is that workpiece such as drilling rod, oil pipe, sucker rod are connected or dismounting, extracts or transfers in the oil well on the ground one by one from oil well then.Workpiece such as connection or dismounting oil pipe or sucker rod mostly adopt hydraulic tongs to finish.In the workover treatment process, hydraulic tongs is generally and (top is called main pincers to using, below be called back-up tong), mainly comprise hydraulic drive motor, travelling gear and Ka Ya assembly composition, by travelling gear the outputting power of hydraulic drive motor is passed to card tooth assembly, make the rotation of card tooth assembly, and then oil pipe or sucker rod pipe collar are gone up shackle.In the process of loading and unloading oil pipe or sucker rod, the position of hydraulic tongs needs lifting constantly, and this just needs with crane hydraulic tongs to be sling earlier, and then the rope on the fixer pressing tongs, wastes time and energy, and operates cumbersome; Simultaneously, this hydraulic tongs that is suspended in midair by workover frame need rely on work hand push operation of people, and not only labour intensity is big, inefficiency, and safety inadequately, and industrial accident happens occasionally.
Summary of the invention
In order to solve the problem that existing hydraulic tongs exists, the object of the present invention is to provide a kind of flexible automatically, can realize that oil pipe (sucker rod) goes up the hydraulic tongs of shackle automatically.
Another object of the present invention is to provide a kind of hydraulic tongs that can realize the rotating cycle counting.
A further object of the present invention is to provide a kind of moment of torsion of can realizing to detect the hydraulic tongs of control.
The objective of the invention is to be achieved through the following technical solutions:
The present invention includes main pincers, back-up tong, height quick change gear mechanism and link, back-up tong is installed on the link, and main clamper is connected with back-up tong by guide rod in the top of back-up tong, and main pincers can move back and forth up and down along guide rod; Height quick change gear mechanism is installed on the main pincers, and its output clamps inner gearshift with the master and links to each other, and height quick change gear mechanism also links to each other with hydraulic control module; Hydraulic tongs is connected with the hydraulic tongs expansion bracket of well workover operation machine fuselage by link.
Wherein: the below of described link is provided with base plate, and base plate and link flexibly connect, and back-up tong is fixed on the base plate; Base plate is connected with flexibly connecting by wire rope of link; Described guide rod comprises urceolus, spring, inner core and spacing guider screw, and inside and outside tube is the inner hollow structure, and both plug, and are provided with spring in inner core, and an end of spring is connected to the top inwall of urceolus, and the other end is connected to the lower end inwall of inner core; Urceolus is provided with spacing guider screw, has slide opening on the inner core, and spacing guider screw inserts in the slide opening; Described height quick change gear mechanism comprises gear shifting hydraulic cylinder, gear shifting handle, hydraulic stem and Connection Block, and an end of gear shifting hydraulic cylinder is installed on the main pincers by Connection Block, and the other end is provided with hydraulic stem, is hinged with gear shifting handle on the hydraulic stem; The rotation caliper of described main pincers is provided with the counting iron block with the common rotation of caliper, is provided with in a side of counting iron block and is installed in fixed magnetic induction sensor on the main pincers; Hydraulic control module is provided with pressure sensor.
Advantage of the present invention and good effect are:
1. the present invention directly is connected hydraulic tongs by link with the hydraulic tongs expansion bracket of well workover operation machine fuselage, has realized the flexible automatically of hydraulic tongs under the driving of expansion bracket, thereby operating personnel are freed from the dangerous operation environment; On the hydraulic tongs/shackle process realized automation mechanized operation, so both reduced working strength of workers, can avoid workman's contingent unexpected injury when operation again.
2. installation is simple, quick between link and the expansion bracket, is convenient to the exchange of oil tube hydraulic tong and sucker rod hydraulic tongs.
3. realize flexibly connecting by the multiple spot wire rope between the base plate of back-up tong installation and the link, realized that short-range automatic adjustment aligns between oil pipe (sucker rod) and the hydraulic tongs.
4. is connected by guide rod between main pincers and the back-up tong, the length of guide rod can be regulated by inner length of spring compressed degree, when bearing main pincers gravity, also realized/shackle process in the flexible modulation of distance between the master, back-up tong.
5. height quick change gear mechanism adopts the cylinder pushes gear shifting handle and finishes, and has realized fluid drive, has avoided the potential safety hazard that adopts gear shift manually to bring.
6. the present invention is by pressure sensor and counting module and magnetic induction sensor, in last/shackle process, realized to the Monitoring and Controlling of hydraulic tongs moment of torsion and to the tally function of rotating cycle.
Description of drawings
Fig. 1 is the position view of the present invention in well workover operation machine;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the local enlarged left view of A place base plate and junction plate syndeton among Fig. 3;
Fig. 5 is the structural representation of guide rod among Fig. 2;
Fig. 6 is the structural representation of height quick change gear mechanism among Fig. 2
Fig. 7 is the vertical view of Fig. 6;
Fig. 8 is the control system flow chart of oil pipe of the present invention (sucker rod) shackle process;
Fig. 9 goes up the control system flow chart of the process of buckleing for oil pipe of the present invention (sucker rod);
Wherein: 1 is hydraulic tongs, and 2 is the well workover operation machine fuselage, and 3 is switch board, 4 is the well workover operation machine chassis, and 5 is well head, and 6 is deck, 7 is oil pipe (sucker rod), and 8 is leading, and 9 is hydraulic motor, 10 is height quick change gear mechanism, and 11 is main pincers, and 12 is guide rod, 13 is connector, and 14 is link, and 15 is back-up tong, 16 is wire rope, and 17 is base plate, and 18 are the counting iron block, 19 is hydraulic control module, and 20 is pressure sensor, and 21 is magnetic induction sensor, 22 is urceolus, and 23 is spring, and 24 is inner core, 25 is slide opening, and 26 is spacing guider screw, and 27 is the gear shifting hydraulic cylinder, 28 is gear shifting handle, and 29 is hydraulic stem, and 30 is Connection Block.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
As Fig. 2, shown in Figure 3, the present invention includes main pincers 11, back-up tong 15, height quick change gear mechanism 10 and link 14, link 14 is provided with two connectors 13, link 14 is fixed together by the hydraulic tongs expansion bracket of connector 13 with the well workover operation machine fuselage earlier, link 14 also is installed on the hydraulic tongs expansion bracket by screw itself, along with the hydraulic tongs expansion bracket stretches out or withdraws, in order to realize being connected of oil circuit and circuit between hydraulic tongs and the manipulator, also be provided with oil circuit joint and explosion-proof air plug on the link 14; As shown in Figure 4, the below of link 14 is provided with base plate 17, back-up tong 15 is fixedly mounted on the base plate 17, between base plate 17 and the link 14 for flexibly connecting, present embodiment is connected to base plate 17 by wire rope 16 and realizes with link 14, in oil pipe (sucker rod) 7 and hydraulic tongs 1 opening not timing of location, can realize between oil pipe (sucker rod) 7 and the hydraulic tongs 1 that short-range automatic adjustment aligns like this; Main pincers 11 are positioned at the top of back-up tong 15, are connected with back-up tong 15 by three guide rods 12, and three guide rods 12 form a triangle, and one of them guide rod is near the well workover operation machine fuselage, and other two guide rods then are positioned at the side near well head; Main pincers 11 can move back and forth up and down along guide rod 12; As shown in Figure 5, guide rod 12 comprises urceolus 22, spring 23, inner core 24 and spacing guider screw 26, inside and outside tube 24,22 is the inner hollow structure, both plug, overlap, be that inner core 24 inserts in the urceolus 22, leave the space that moves up and down for both between the top inwall of urceolus 22 and the top of inner core 24; In inner core 24, be provided with spring 23, one end of spring 23 is connected to the top inwall of urceolus 22, the other end is connected to the lower end inwall of inner core 24, compression degree by regulating spring 23, can regulate the length of guide rod 12, and then the distance between main pincers 11 of adjusting and the back-up tong 15, in addition, guide rod 12 is also being born the compression of main pincers 11 gravity generation; Urceolus 22 is provided with spacing guider screw 26, have slide opening 25 on the inner core 24, slide opening 25 is an elongated strip shaped hole, spacing guider screw 26 inserts in the slide opening 25, both can prevent that inner core 24 from rotating with respect to urceolus 22, can prevent that also inner core 24 from shifting out in urceolus 22. as Fig. 6, shown in Figure 7, height quick change gear mechanism 10 is installed on the main pincers 11, comprise gear shifting hydraulic cylinder 27, gear shifting handle 28, hydraulic stem 29 and Connection Block 30, one end of gear shifting hydraulic cylinder 27 is installed on the main pincers 11 by Connection Block 30, and the other end is provided with hydraulic stem 29; One end and the hydraulic stem 29 of gear shifting handle 28 are hinged, the other end links to each other with the gearshift of main pincers 11 inside, gearshift in the main pincers 11 is to be provided with balladeur train and fixed gear that two numbers of teeth do not wait on the output shaft of the hydraulic motor 9 on the main pincers 11, fixed gear is between two balladeur trains, be fastened on by key on the output shaft of hydraulic motor 9, fixed gear is with a geared sleeve outward, this geared sleeve is an internal gear, can slide up and down along the fixed gear surface, realize the gear shift transmission of high low speed by clutch with two balladeur trains, geared sleeve links to each other with selector shaft, under the driving of gear shifting hydraulic cylinder 27, hydraulic stem 29 moves back and forth along the axial direction of gear shifting hydraulic cylinder 27, and gear shifting handle 28 promptly under the drive of hydraulic stem 29, rotates around hinged end, and then by the motion up and down of selector shaft driven wheel cover, by the balladeur train clutch of geared sleeve with the different numbers of teeth, can realize high low speed fluid drive, control the rotary speed of main pincers 11; Main pincers 11 are commercial product with back-up tong 15, purchase the hydraulic power tongs of models such as XQ89/3YD, XQ114/6YC in Haicheng Petroleum Machinery Mfg. Co., Ltd. or XQ140/12Y; Height quick change gear mechanism 10 also links to each other with hydraulic control module 19, and by the gear shift of hydraulic control module 19 control height quick change gear mechanisms, hydraulic control module 19 is provided with pressure sensor 20, realizes monitoring to the hydraulic tongs moment of torsion by the pressure of detection hydraulic oil; The rotation caliper of main pincers 11 is provided with the counting iron block 18 with the common rotation of caliper, be provided with in a side of counting iron block 18 and be installed on the main pincers 11 fixed magnetic induction sensor 21. wherein, pressure sensor 20 is commercial product, purchases the JYB-KO-HAG-1 type pressure sensor of producing in Beijing Collihigh Sensor Technology Center; Magnetic induction sensor 21 is commercial product, purchases in the BIM-IKE-Y1X type magnetic induction sensor of German TURCK company.
The principle of the present invention and the course of work are:
As shown in Figure 1, hydraulic tongs 1 of the present invention is positioned at tap 8 below, is installed on the expansion bracket of well workover operation machine, is contracted in the side of well workover operation machine fuselage 2 by well head 5 when idle, stretch out during work oil pipe (sucker rod) 7 carried out on/shackle.Well workover operation machine fuselage 2 is positioned on the well workover operation machine chassis 4, and tap 8 is positioned at the top of well workover operation machine fuselage 2, and well workover operation machine fuselage 2 is provided with switch board 3; Tap 8 stretches out when work, and aligns well head 4; When not working, the tap withdrawal is so that transportation; Deck 6 directly drops on the well head 5.
As shown in Figure 8, the shackle process of hydraulic tongs is:
Detect the oil pipe pipe collar and arrive when needing the position of shackle when detecting the light curtain, hydraulic tongs stretches out under the driving of the hydraulic tongs expansion bracket of well workover operation machine fuselage, to lead pincers 11 and align and control oil pipe with back-up tong 15, hydraulic control module 19 is under the control of control system (control system of the present invention is a prior art), height quick change gear mechanism 10 is switched to low or first gear, be that the signal that gear shifting hydraulic cylinder 27 receives hydraulic control module 19 is started working, drive hydraulic stem 29 actions, gear shifting handle 28 rotates around the hinged place under the drive of hydraulic stem 29, make on the geared sleeve in the main pincers 11/action down, switch to low or first gear; At this moment, back-up tong 15 is held oil pipe tightly, and 11 pairs of oil pipes of the main pincers of hydraulic motor 9 drivings collapse to be buckled; Collapsing when button, can monitor by 20 pairs of pressure that collapse the hydraulic oil of button process of pressure sensor, significantly descend as the pressure of hydraulic oil, illustrate that then the spiral shell button unclamps, if significantly do not descend, illustrate that then the spiral shell button is too tight, need manually collapse button; Collapse after button finishes, hydraulic control module 19 switches to top gear with height quick change gear mechanism 10 under the control of control system, and hydraulic motor 9 drives 11 pairs of oil pipes of main pincers and carries out the high speed swivel shackle; In rotary course, counting iron block 18 on the main pincers 11 whenever rotates a circle promptly by a magnetic induction sensor 21, the number of turns of 21 pairs of oil pipe shackles of magnetic induction sensor is counted, and numerical value fed back to control system, when the revolution number of turns reaches setting value, control system thinks that promptly shackle finishes, and main pincers 11 stop the rotation; After shackle was finished, hydraulic tongs 1 was withdrawn under the driving of the hydraulic tongs expansion bracket of well workover operation machine fuselage. and rising or the decline of main pincers 11 in shackle process realizes by guide rod 12.
As shown in Figure 9, the last button process of hydraulic tongs is:
When detection light curtain detects the position that buckle on the oil pipe lower end arrival needs, hydraulic tongs 1 stretches out under the driving of the hydraulic tongs expansion bracket of well workover operation machine fuselage, to lead pincers 11 and align and control oil pipe with back-up tong 15, hydraulic control module 19 is under the control of control system, height quick change gear mechanism 10 is switched to low or first gear, be that the signal that gear shifting hydraulic cylinder 27 receives hydraulic control module 19 is started working, drive hydraulic stem 29 actions, gear shifting handle 28 rotates around the hinged place under the drive of hydraulic stem 29, make on the geared sleeve in the main pincers 11/action down, switch to top gear; Hydraulic motor 9 drives 11 pairs of oil pipes of main pincers and carries out that low speed is tough to be buckled; After tough button is finished, hydraulic control module 19 is under the control of control system, height quick change gear mechanism 10 is switched to top gear, be that the signal that gear shifting hydraulic cylinder 27 receives hydraulic control module 19 is started working, drive hydraulic stem 29 actions, gear shifting handle 28 rotates around the hinged place under the drive of hydraulic stem 29, makes on the geared sleeve in the main pincers 11/action down, switches to top gear; 11 pairs of oil pipes of the main pincers of hydraulic motor 9 drivings carry out the high speed rotation and upward buckle, reach when setting value when buckle the number of turns on the oil pipe of magnetic induction sensor 21 record, hydraulic control module 19 switches to low or first gear with height quick change gear mechanism 10 under the control of control system, utilize 11 pairs of oil pipes of main pincers to link closely, the pressure of hydraulic oil that can be by 20 pairs of processes that link closely of pressure sensor when linking closely is monitored, pressure as hydraulic oil does not reach setting value, illustrate that then the spiral shell button still needs further to tighten, if reach setting value, illustrate that then the spiral shell button has reached the button requirement; After last button was finished, hydraulic tongs 1 was withdrawn under the driving of the hydraulic tongs expansion bracket of well workover operation machine fuselage.
Hydraulic tongs of the present invention can be divided into oil tube hydraulic tong and sucker rod hydraulic tongs, and two kinds of hydraulic tongs structures are identical, and difference is the technical data index.
The technical data index of oil tube hydraulic tong: rating system pressure is 11MPa, rated fuel delivery is 80L/min, main pincers φ 73 (flat and thickening), the specified moment of torsion of keeping out of main pincers is 3.5kNm, the specified rotating speed of keeping out of main pincers is 25～38r/min, the specified high gear moment of torsion of main pincers is 1kNm, the specified high gear rotating speed of main pincers is 84～105r/min, the opening size of main pincers is 95mm, the moving mass of main pincers is 120kg, and the scope of application of back-up tong is φ 73 (flat and thickening), and the nominal torque of back-up tong is 3.5kNm, the opening size of back-up tong is 120mm, and the moving mass of back-up tong is 40kg;
The technical data index of sucker rod hydraulic tongs: rating system pressure is 10MPa, rated fuel delivery is 80L/min, the scope of application of main pincers is φ 16, φ 19, φ 22, φ 25, φ 28, the specified moment of torsion of keeping out of main pincers is 1.8kNm, the specified rotating speed of keeping out of main pincers is 46r/min, the specified high gear moment of torsion of main pincers is 0.8kNm, the specified high gear rotating speed of main pincers is 120r/min, the opening size of main pincers is 66mm, the moving mass of main pincers is 100kg, the scope of application of back-up tong is: φ 16, φ 19, φ 22, φ 25, φ 28, and the nominal torque of back-up tong is 1.8kNm, and the moving mass of back-up tong is 20kg.
The present invention greatly reduces the danger of labor intensity of operating personnel and workover treatment process, for field produces has been created huge benefit.
Claims (7)
1. hydraulic tongs, it is characterized in that: comprise main pincers (11), back-up tong (15), height quick change gear mechanism (10) and link (14), back-up tong (15) is installed on the link (14), main pincers (11) are positioned at the top of back-up tong (15), be connected with back-up tong (15) by guide rod (12), main pincers (11) can move back and forth up and down along guide rod (12); Height quick change gear mechanism (10) is installed on the main pincers (11), and its output links to each other with main (11) the inner gearshift that clamps, and height quick change gear mechanism (10) also links to each other with hydraulic control module (19); Hydraulic tongs is connected with the hydraulic tongs expansion bracket of well workover operation machine fuselage by link (14).
2. by the described hydraulic tongs of claim 1, it is characterized in that: the below of described link (14) is provided with base plate (17), and base plate (17) flexibly connects with link (14), and back-up tong (15) is fixed on the base plate (17).
3. by the described hydraulic tongs of claim 2, it is characterized in that: described base plate (17) is connected with flexibly connecting by wire rope (16) of link (14).
4. by the described hydraulic tongs of claim 1, it is characterized in that: described guide rod (12) comprises urceolus (22), spring (23), inner core (24) and spacing guider screw (26), inside and outside tube (24,22) is the inner hollow structure, both plug, in inner core (24), be provided with spring (23), one end of spring (23) is connected to the top inwall of urceolus (22), and the other end is connected to the lower end inwall of inner core (24); Urceolus (22) is provided with spacing guider screw (26), has slide opening (25) on the inner core (24), and spacing guider screw (26) inserts in the slide opening (25).
5. by the described hydraulic tongs of claim 1, it is characterized in that: described height quick change gear mechanism (10) comprises gear shifting hydraulic cylinder (27), gear shifting handle (28), hydraulic stem (29) and Connection Block (30), one end of gear shifting hydraulic cylinder (27) is installed on the main pincers (11) by Connection Block (30), the other end is provided with hydraulic stem (29), is hinged with gear shifting handle (28) on the hydraulic stem (29).
6. by the described hydraulic tongs of claim 1, it is characterized in that: the rotation caliper of described main pincers (11) is provided with and the counting iron block (18) of the common rotation of caliper, is provided with in a side of counting iron block (18) to be installed in main pincers (11) and to go up fixed magnetic induction sensor (21).
7. by the described hydraulic tongs of claim 1, it is characterized in that: described hydraulic control module (19) is provided with pressure sensor (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810012726A CN101429856B (en) | 2008-08-08 | 2008-08-08 | Hydraulic pliers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810012726A CN101429856B (en) | 2008-08-08 | 2008-08-08 | Hydraulic pliers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101429856A CN101429856A (en) | 2009-05-13 |
| CN101429856B true CN101429856B (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810012726A Expired - Fee Related CN101429856B (en) | 2008-08-08 | 2008-08-08 | Hydraulic pliers |
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| CN (1) | CN101429856B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9458683B2 (en) | 2012-11-19 | 2016-10-04 | Key Energy Services, Llc | Mechanized and automated well service rig system |
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| FI123117B (en) | 2011-02-18 | 2012-11-15 | Sandvik Mining & Constr Oy | Control device for controlling a drill pipe |
| CN102278083B (en) * | 2011-07-06 | 2014-05-21 | 杭州欧佩亚海洋工程有限公司 | Intelligent casing tongs with back-up tongs |
| CN103192374A (en) * | 2012-01-05 | 2013-07-10 | 沈阳新松机器人自动化股份有限公司 | Atmospheric mechanical hand |
| CN104695878B (en) * | 2013-12-06 | 2017-05-31 | 中国石油天然气股份有限公司 | Remote control type hydraulic clamp device and control method |
| CN105625965B (en) * | 2016-03-24 | 2017-11-07 | 江苏如石机械有限公司 | Intelligent drilling Power Tong |
| CN107100593B (en) * | 2016-10-14 | 2019-04-16 | 南通大学 | Offshore oil drilling platform well head outfit and tubing string interconnection method |
| CN109812235B (en) * | 2018-07-31 | 2020-11-10 | 宝鸡石油机械有限责任公司 | Automatic aligning device and method for opening of power tongs |
| CN109779542B (en) * | 2019-03-14 | 2024-04-02 | 胜利油田胜机石油装备有限公司 | Hydraulic pliers |
| CN112049588B (en) * | 2020-08-13 | 2022-06-28 | 四川宏华石油设备有限公司 | Spinner structure |
| CN117345131A (en) * | 2023-11-29 | 2024-01-05 | 克拉玛依市建业能源股份有限公司 | Electric pipe rod pliers for workover |
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| US5060542A (en) * | 1990-10-12 | 1991-10-29 | Hawk Industries, Inc. | Apparatus and method for making and breaking joints in drill pipe strings |
| US5255751A (en) * | 1991-11-07 | 1993-10-26 | Huey Stogner | Oilfield make-up and breakout tool for top drive drilling systems |
| CN2373555Y (en) * | 1999-02-25 | 2000-04-12 | 梁伟成 | Hydraulic power pliers with upper buckle torque regulating device |
| CN2674073Y (en) * | 2003-12-31 | 2005-01-26 | 崔时光 | Hydraulic pliers |
| CN201236647Y (en) * | 2008-08-08 | 2009-05-13 | 辽河石油勘探局 | Hydraulic pliers |
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- 2008-08-08 CN CN200810012726A patent/CN101429856B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2073028U (en) * | 1990-07-18 | 1991-03-13 | 大港石油管理局钻采工艺研究院 | Linkage power clamp composed of main clamp and back damp |
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| US5255751A (en) * | 1991-11-07 | 1993-10-26 | Huey Stogner | Oilfield make-up and breakout tool for top drive drilling systems |
| CN2373555Y (en) * | 1999-02-25 | 2000-04-12 | 梁伟成 | Hydraulic power pliers with upper buckle torque regulating device |
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| CN201236647Y (en) * | 2008-08-08 | 2009-05-13 | 辽河石油勘探局 | Hydraulic pliers |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9458683B2 (en) | 2012-11-19 | 2016-10-04 | Key Energy Services, Llc | Mechanized and automated well service rig system |
| US9470050B2 (en) | 2012-11-19 | 2016-10-18 | Key Energy Services, Llc | Mechanized and automated catwalk system |
| US9562406B2 (en) | 2012-11-19 | 2017-02-07 | Key Energy Services, Llc | Mechanized and automated well service rig |
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| Publication number | Publication date |
|---|---|
| CN101429856A (en) | 2009-05-13 |
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