CN114562219B - Drill rod torque reducer - Google Patents
Drill rod torque reducer Download PDFInfo
- Publication number
- CN114562219B CN114562219B CN202011361484.4A CN202011361484A CN114562219B CN 114562219 B CN114562219 B CN 114562219B CN 202011361484 A CN202011361484 A CN 202011361484A CN 114562219 B CN114562219 B CN 114562219B
- Authority
- CN
- China
- Prior art keywords
- drill rod
- inner sleeve
- sleeve
- slips
- torque limiter
- 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.)
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 230000006835 compression Effects 0.000 claims description 21
- 238000007906 compression Methods 0.000 claims description 21
- 230000003068 static effect Effects 0.000 claims description 14
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 10
- 238000005553 drilling Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
- E21B17/1064—Pipes or rods with a relatively rotating sleeve
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/05—Swivel joints
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1085—Wear protectors; Blast joints; Hard facing
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
本发明提供了一种钻杆减扭器，包括：套设在钻杆上的内套筒；两个从所述内套筒的两端轴向压紧式安装在所述内套筒与所述钻杆径向之间的卡瓦；套设在所述内套筒外侧的外套筒，所述外套筒与所述内套筒间隙配合；对称式设置在所述内套筒的轴向两端的压紧机构；其中，所述钻杆减扭器设置在钻杆与钻杆外的套管之间，所述压紧机构构造成能够轴向向内压紧所述卡瓦，以使所述内套筒能够随所述钻杆同步转动，且所述外套筒通过所述压紧机构能够相对于所述内套筒转动，从而使所述外套筒与所述钻杆外的套管相对静止。
The present invention provides a drill rod torque reducer, comprising: an inner sleeve sleeved on the drill rod; two slips axially pressed and installed between the inner sleeve and the drill rod radially from both ends of the inner sleeve; an outer sleeve sleeved on the outside of the inner sleeve, the outer sleeve and the inner sleeve having a clearance fit; and a pressing mechanism symmetrically arranged at both axial ends of the inner sleeve; wherein the drill rod torque reducer is arranged between the drill rod and the casing outside the drill rod, the pressing mechanism is configured to press the slips axially inwardly, so that the inner sleeve can rotate synchronously with the drill rod, and the outer sleeve can rotate relative to the inner sleeve through the pressing mechanism, so that the outer sleeve and the casing outside the drill rod are relatively stationary.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling tools, and particularly relates to a drill rod torque reducer.
Background
In drilling large displacement wells, high inclination wells, horizontal wells and deep wells, or in well sections with larger severity of dog legs, or in long open hole drilling processes after technical casing is run in, abrasion problems often occur in the casing, and damage to the technical casing often causes great difficulties in underground construction of the casing, such as casing fracture, dislocation and deformation, so that running is blocked, in addition, problems of casing extrusion resistance and internal pressure resistance caused by the problems restrict the smooth performance of subsequent well completion testing operation of the oil well, the service life of the oil well is reduced, and certain sections of oil wells are scrapped and whole oil wells are scrapped when serious.
In the traditional drilling construction process, a drilling rod rubber protection hoop is mainly adopted, for example, a drilling rod, a sleeve wear preventer or a deep well ultra-deep well sleeve wear preventer are arranged in the prior art, the wear preventer is formed by fixing a rubber sleeve on the drilling rod through a locking block by a metal framework, the sleeve is further protected by wearing the rubber sleeve, but the rubber sleeve is easy to tear, the service life is short, the underground complex is easy to drop, and the like. There are also anti-wear joints in the prior art that are attached to both ends of the drill pipe, adding many threaded connections in the drill string, however, too many threaded connections add unsafe factors to the well, resulting in reduced safety performance of the well.
Disclosure of Invention
The invention aims to solve the technical problems, and aims to provide a drill rod torque reducer, which is arranged between a drill rod and a sleeve, can enable the sleeve outside the drill rod to rotate relative to the drill rod and keep static so as to avoid contact dynamic friction between the inner wall of the sleeve and the drill string, effectively prevent the sleeve and the drill string from being worn, and can bear a certain axial pulling force so as to avoid the sleeve from being disassembled and damaged to cause underground complexity.
The invention provides a drill rod torque reducer which comprises an inner sleeve sleeved on a drill rod, two slips axially and tightly arranged between the inner sleeve and the radial direction of the drill rod from two ends of the inner sleeve, an outer sleeve sleeved on the outer side of the inner sleeve and in clearance fit with the inner sleeve, and a pressing mechanism symmetrically arranged at two axial ends of the inner sleeve, wherein the drill rod torque reducer is arranged between the drill rod and a sleeve outside the drill rod, the pressing mechanism is configured to be capable of pressing the slips axially inwards so that the inner sleeve can synchronously rotate along with the drill rod, and the outer sleeve can rotate relative to the inner sleeve through the pressing mechanism so that the outer sleeve and the sleeve outside the drill rod are relatively static.
In one embodiment, the compression mechanism comprises a thrust bearing and a compression nut arranged at the end of the inner sleeve, wherein the compression nut is arranged at the axial outer side of the thrust bearing and is in threaded connection with the outer sleeve, and the slips can be axially compressed by tightening the compression nut.
In one embodiment, a pressure plate is provided between the inner sleeve and the thrust bearing for transmitting axial compression forces.
In one embodiment, the inner sleeve comprises two split-type first and second bodies assembled by a dovetail configuration to form the inner sleeve.
In one embodiment, the inner diameter of the inner sleeve is configured to taper axially inwardly from both ends such that the inner walls of both ends of the inner sleeve form a first taper.
In one embodiment, the outer wall surface of the slip is configured to be a second conical surface to enable the slip to fit between the first conical surface and the drill pipe.
In one embodiment, the taper of the second taper is the same as the taper of the first taper.
In one embodiment, the slip is configured to include two slip bodies which are arranged in a split manner and have the same structure, and the two slip bodies hug the drill rod under the axial compression force of the compression mechanism, and are in compression fit with the first conical surface and the second conical surface, so that the inner sleeve is static relative to the drill rod.
In one embodiment, the inner wall surface of the slip body is provided with saw-tooth teeth.
In one embodiment, the outer sleeve is made of a low carbon steel material.
Compared with the prior art, the invention has the advantages that:
The drill rod torque reducer is arranged between the drill rod and the drill rod outer sleeve, the inner sleeve of the torque reducer can bear certain circumferential torque through the slips and can be static relative to the drill rod and static relative to the sleeve outside the drill rod, and meanwhile, the inner sleeve can rotate relative to the outer sleeve through the pressing mechanism, so that the outer sleeve is static relative to the drill rod outer sleeve, contact dynamic friction between the inner wall of the sleeve and the drill string is avoided, abrasion of the sleeve and the drill string is effectively prevented, and the service life of the sleeve is prolonged. And moreover, the slips can bear certain axial tension under the action of the pressing mechanism, so that underground complexity caused by damage due to disassembly of the sleeve is effectively avoided, and the site construction safety performance is enhanced. In addition, the drill rod torque reducing device is simple in structure, convenient to install and beneficial to improving on-site construction efficiency.
Drawings
The present invention will be described below with reference to the accompanying drawings.
Fig. 1 shows the construction of a drill rod torque limiter according to the invention.
Fig. 2 shows the construction of the inner sleeve in the drill rod torque limiter of fig. 1.
Fig. 3 shows the construction of slips in the rod string torque reducer of fig. 1.
In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
Fig. 1 shows the construction of a drill rod torque limiter 100 according to the present invention. The drill rod torque limiter 100 is for installation between a downhole drill rod and casing to reduce friction between the drill rod and casing and thereby avoid casing and drill string wear. As shown in fig. 1, the drill rod torque limiter 100 comprises an inner sleeve 2 sleeved on the drill rod 1, two slips 3 respectively installed between the inner sleeve 2 and the radial direction of the drill rod 1 in an axially compressed mode from two ends of the inner sleeve 2, an outer sleeve 4 sleeved on the outer side of the inner sleeve 2, and compression mechanisms 5 symmetrically arranged at two ends of the inner sleeve 2. The hold-down mechanism 5 is capable of holding down the respective slips 3 axially inwardly so that the two slips 3 are axially relatively close such that the inner sleeve 2 forms a press fit with the drill rod 1 to be stationary with respect to the drill rod 1 and is capable of rotating with respect to the outer sleeve 4 so that the outer sleeve 4 is capable of being stationary with respect to the casing outside the drill rod. Hereby is achieved that contact kinetic friction between the inner wall of the casing and the drill string is prevented, whereby wear of the casing and the drill string is avoided.
The drill rod 1 extends at both ends to the axial ends of the inner sleeve 2 and extends axially outwardly for connection to other downhole drill rods or other components via a drill rod joint (not shown).
As shown in fig. 1 and 2, the inner sleeve 2 comprises two separately arranged first and second bodies 21, 22. In one embodiment, the semi-cylindrical first body 21 and second body 22 are assembled by a dovetail configuration to form the cylindrical inner sleeve 2. The split type inner sleeve 2 is convenient to be installed on the outer side of the drill rod 1 on site, the inner sleeve 2 can be installed without being disassembled when the drill rod 1 is long or other parts are connected, the installation efficiency of the drill rod torque reducer 100 is improved conveniently, and the on-site operation efficiency is improved.
According to the present invention, the inner diameters of both ends of the inner sleeve 2 are set to decrease from both ends in the axial direction toward the middle, so that the inner walls of both ends of the inner sleeve 2 form a first tapered surface, and the middle region of the inner wall of the inner sleeve 2 forms a cylindrical surface. The outer surface of the inner sleeve 2 is a cylindrical surface. Preferably, the structure of the axial both ends of the inner sleeve 2 is arranged symmetrically with respect to the axial middle. The function of the first taper is described below.
In one embodiment, the inner diameter of the central region of the inner sleeve 2 is slightly larger than the outer diameter of the drill rod 1. This facilitates the installation of the inner sleeve 2 on the outside of the drill rod 1.
As shown in fig. 1, the outer sleeve 4 is concentrically sleeved outside the inner sleeve 2. The outer sleeve 4 is of unitary cylindrical construction. The axial length of the outer sleeve 4 is greater than the axial length of the inner sleeve 2. The hold-down mechanism 5 is provided at both axial ends of the inner sleeve 2, the hold-down mechanism 5 including a thrust bearing 51 and a hold-down nut 52 provided at an end of the inner sleeve 2, the hold-down nut 52 being provided axially outside the thrust bearing 51. The hold-down mechanism 5 is arranged between the axially outer part of the outer sleeve 4 extending to the inner sleeve 2 and the radial direction of the drill rod 1. In one embodiment, internal threads are provided on the inner walls of the two ends of the outer sleeve 4, and the compression nut 52 is threadedly coupled to the outer sleeve 4, whereby the thrust bearing 51 can be axially pushed to axially compress the slips 3 by tightening the compression nut 52.
To prevent wear of the sleeve, the outer sleeve 4 may for example be made of a low carbon steel material.
In the present embodiment, the thrust bearing 51 may be, for example, a leg ball bearing, or a diamond thrust bearing. The inner bore diameter of the thrust bearing 51 is slightly larger than the outer diameter of the drill rod joint of the drill rod 1 in field use for installation connection.
According to the invention, a pressure plate 53 is provided between the inner sleeve 2 and the thrust bearing 51. The pressing plate 53 is a split circular plate, the middle part is provided with an inner hole, the diameter of the inner hole is larger than the outer diameter of the drill rod. The presser plates 53 are at the axially outer ends of the slips 3 for transmitting the axial compressive force applied by the compression nut 52 to the slips 3, thereby axially pushing the slips 3 axially compressively mounted between the inner sleeve 2 and the radial direction of the drill rod 1.
As shown in fig. 3, the outer diameter of the slips 3 is arranged to taper from an axially outer end (upper end in fig. 3) to an axially inner end (lower end in fig. 3) such that the outer wall of the slips 3 forms a second conical surface to enable the slips 3 to fit between the first conical surface of the inner sleeve 2 and the radial direction of the drill pipe 1. The taper of the second conical surface is set to be the same as the taper of the first conical surface of the inner sleeve 2.
According to the invention, the slip 3 is constructed to comprise two slip bodies 31 which are arranged in a split manner and have the same structure, and the slip bodies 31 are semi-cylindrical. The two slips 3 are symmetrically arranged between the first conical surfaces at the two ends of the inner sleeve 2 and the drill rod 1. When the pressing mechanism 5 axially presses the slips 3, the slip body 31 tightly holds the drill rod 1 under the action of the axial pressing force. Moreover, under the action of friction force between the first conical surface and the second conical surface, the inner sleeve 2 bears a certain circumferential torque when the slips 3 are in press fit with the inner sleeve 2, so that the inner sleeve 2 can synchronously rotate along with the drill rod, namely, the inner sleeve 2 is static relative to the drill rod 1 through the slips 3. At the same time, the inner sleeve 2 is rotatable relative to the outer sleeve 4 by means of the thrust bearing 51, so that the outer sleeve 4 does not rotate with the drill rod outer sleeve, even if the outer sleeve 4 is stationary relative to the drill rod outer sleeve. Therefore, the contact dynamic friction between the inner wall of the sleeve and the drill string can be effectively prevented, the abrasion of the sleeve and the drill string is avoided, and the service life of the sleeve is effectively prolonged.
In one embodiment, saw teeth 32 are provided on the inner wall surface of the slip body 31. Further, a plurality of grooves extending in the axial direction may be provided on the inner surface and/or the outer surface of the slip 3, and the plurality of grooves are uniformly distributed in the circumferential direction. The axial force born by the slips 3 after the slips 3 are tightly held on the drill rod 1 can be increased, and stable rotation of the slips 3 along with the drill rod 1 is effectively ensured.
According to the present invention, two pressing mechanisms 5, which are correspondingly provided at both upper and lower ends of the inner sleeve 2, are identical, so that symmetrical pressing structures are formed at both ends of the inner sleeve 2. In actual operation, the same axial compression force can be applied to the slips 3 at the two ends of the inner sleeve 2 by screwing the corresponding compression nuts 52, and the axial compression force is transmitted to the slips 3 through the thrust bearing 52 and the pressing plate 53, so that the slips 3 tightly hold the drill rod 1 through the inner wall saw tooth teeth 32, and meanwhile, the second conical surface of the slips 3 is in compression fit with the first conical surface of the inner sleeve 2, and therefore, the inner sleeve 2 and the drill rod 1 are relatively static, and the inner sleeve 2 can synchronously rotate along with the drill rod 1. Meanwhile, the inner sleeve 2 can rotate relative to the outer sleeve 4 under the action of the thrust bearing 52 of the pressing mechanism 5, so that the outer sleeve 4 does not rotate along with the inner sleeve 2 to be static relative to the drill rod outer sleeve, and abrasion caused by relative friction between the outer sleeve 4 and the drill rod outer sleeve is avoided.
The drill rod torque reducer 100 is arranged between the drill rod 1 and the drill rod outer sleeve, the inner sleeve 2 of the drill rod torque reducer can bear certain circumferential torque through the slips 3 and can be static relative to the drill rod 1 and static relative to the sleeve outside the drill rod, meanwhile, the inner sleeve 2 can rotate relative to the outer sleeve 4 through the pressing mechanism 5, and therefore the outer sleeve 4 is static relative to the drill rod outer sleeve, contact dynamic friction between the inner wall of the sleeve and the drill string is avoided, abrasion of the sleeve and the drill string is effectively prevented, and the service life of the sleeve is prolonged. And, slips 3 can bear certain axial pulling force under the effect of hold-down mechanism 5 to effectively avoid the sleeve pipe to break up and damage and lead to the complicacy in the pit, reinforcing site operation security performance. In addition, the drill rod torque reducer 100 is simple in structure and convenient to install, and is beneficial to improving site construction efficiency.
Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A drill rod torque limiter comprising:
An inner sleeve (2) sleeved on the drill rod (1);
two slips (3) which are installed between the inner sleeve and the radial direction of the drill rod in an axial compression mode from two ends of the inner sleeve;
An outer sleeve (4) sleeved outside the inner sleeve, and the outer sleeve is in clearance fit with the inner sleeve;
The compressing mechanisms (5) are symmetrically arranged at the two axial ends of the inner sleeve;
The drill rod torque reducer is arranged between the drill rod and a sleeve outside the drill rod, the pressing mechanism is configured to be capable of pressing the slips axially inwards, so that the inner sleeve can synchronously rotate along with the drill rod, and the outer sleeve can rotate relative to the inner sleeve through the pressing mechanism, so that the outer sleeve and the sleeve outside the drill rod are relatively static.
2. The drill rod torque limiter according to claim 1, wherein the hold-down mechanism comprises a thrust bearing (51) provided at an end of the inner sleeve and a hold-down nut (52) provided axially outwardly of the thrust bearing and threadedly connected to the outer sleeve, the slips being axially compressible by tightening the hold-down nut.
3. Drill rod torque limiter according to claim 2, characterized in that a pressure plate (53) is provided between the inner sleeve and the thrust bearing for transmitting axial compression forces.
4. A drill rod torque limiter according to any one of claims 1 to 3, characterized in that the inner sleeve comprises two split-set first (21) and second (22) bodies assembled by means of a dovetail arrangement to form the inner sleeve.
5. A drill rod torque limiter according to any one of claims 1 to 3 wherein the inner diameter of the inner sleeve is arranged to taper axially inwardly from both ends so that the inner walls of both ends of the inner sleeve form a first taper.
6. The drill pipe torque limiter of claim 5 wherein the outer wall surface of the slips is configured as a second tapered surface to enable the slips to fit between the first tapered surface and the drill pipe.
7. The drill rod torque limiter of claim 6, wherein the taper of the second tapered surface is the same as the taper of the first tapered surface.
8. The drill pipe torque limiter according to claim 7, wherein the slips are configured to comprise two slip bodies (31) which are provided in separate pieces and are identical in structure,
The two slip bodies hold the drill rod tightly under the axial compression force of the compression mechanism, and the first conical surface is in compression fit with the second conical surface, so that the inner sleeve is static relative to the drill rod.
9. The drill rod torque limiter according to claim 7, wherein the inner wall surface of the slip body is provided with saw-tooth teeth (32).
10. A drill rod torque limiter according to claim 1 or claim 2 wherein the outer sleeve is of a mild steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011361484.4A CN114562219B (en) | 2020-11-27 | 2020-11-27 | Drill rod torque reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011361484.4A CN114562219B (en) | 2020-11-27 | 2020-11-27 | Drill rod torque reducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114562219A CN114562219A (en) | 2022-05-31 |
| CN114562219B true CN114562219B (en) | 2024-12-20 |
Family
ID=81712622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011361484.4A Active CN114562219B (en) | 2020-11-27 | 2020-11-27 | Drill rod torque reducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114562219B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118705244B (en) * | 2024-08-27 | 2024-11-05 | 山东省地质矿产勘查开发局第七地质大队（山东省第七地质矿产勘查院） | A directional drilling anti-rotation device for vertical shaft drilling rig |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525884A (en) * | 2014-09-28 | 2016-04-27 | 中国石油化工集团公司 | Pipe column feeding tool with double releasing mechanisms |
| CN110424900A (en) * | 2019-08-26 | 2019-11-08 | 四川轻化工大学 | Torsion reducing joint for drill rod |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4083612A (en) * | 1976-10-15 | 1978-04-11 | Smith International, Inc. | Non-rotating stabilizer for earth boring and bearing therefor |
| US6739415B2 (en) * | 1999-01-06 | 2004-05-25 | Western Well Tool, Inc. | Drill pipe protector |
| CN2861450Y (en) * | 2005-10-21 | 2007-01-24 | 大庆石油管理局 | Torsion and wear reducing joint of flow passage type drill rod |
| GB2537285B (en) * | 2014-01-10 | 2018-06-06 | Tercel Ip Ltd | Downhole swivel sub |
-
2020
- 2020-11-27 CN CN202011361484.4A patent/CN114562219B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525884A (en) * | 2014-09-28 | 2016-04-27 | 中国石油化工集团公司 | Pipe column feeding tool with double releasing mechanisms |
| CN110424900A (en) * | 2019-08-26 | 2019-11-08 | 四川轻化工大学 | Torsion reducing joint for drill rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114562219A (en) | 2022-05-31 |
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