CN112878925A - Large water hole light well repairing drill rod - Google Patents
Large water hole light well repairing drill rod Download PDFInfo
- Publication number
- CN112878925A CN112878925A CN202110127937.5A CN202110127937A CN112878925A CN 112878925 A CN112878925 A CN 112878925A CN 202110127937 A CN202110127937 A CN 202110127937A CN 112878925 A CN112878925 A CN 112878925A
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- drill rod
- joint
- drill
- structure part
- rod body
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 4
- 238000005553 drilling Methods 0.000 abstract description 29
- 238000003466 welding Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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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
-
- 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
- E21B17/042—Threaded
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
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- 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
The invention belongs to the technical field of drilling tools, and particularly relates to a large-water-hole light workover drill rod, aiming at solving the problem of insufficient mechanical strength of the drill rod in the prior art, the application provides the large-water-hole light workover drill rod, which comprises a drill rod body, a first drill rod joint and a second drill rod joint, wherein the first drill rod joint and the second drill rod joint are respectively arranged at two ends of the drill rod body, the outer diameter of the drill rod body is set to be between 100mm and 103mm, and the outer diameter of the first drill rod joint and the outer diameter of the second drill rod joint are set to be between 130mm and 143 mm; the inner diameter of the drill rod body is set between 81mm and 86mm, and the inner diameter of the first drill rod joint and the second drill rod joint is set between 81mm and 85 mm. The mechanical strength is high, the requirement of well repairing operation of deep wells and ultra-deep wells can be met, and the safety and the efficiency improvement of well drilling are guaranteed.
Description
Technical Field
The invention belongs to the technical field of drilling tools, and particularly relates to a large-water-hole light workover drill rod.
Background
Aiming at the well repairing operation conditions of deep wells and ultra-deep wells in the northward region, the XJ850 workover rig and the matched well repairing process have the problems of low drilling tool strength, high load of the workover rig, high pump pressure and the like. For example: the XJ850 workover rig safety lift load is exceeded using a conventional 4 "+ 31/2" +27/8 "drill string assembly. This requires that the drill pipe have better mechanical strength and hydraulic parameters to accommodate the safe and accelerated operations of the XJ850 workover rig.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problem of insufficient mechanical strength of the drill rod in the prior art, the application provides a large-water-hole light workover drill rod, which comprises a drill rod body, a first drill rod joint and a second drill rod joint, wherein the first drill rod joint and the second drill rod joint are respectively arranged at two ends of the drill rod body;
the inner walls of two pipe ends of the drill rod body are retracted inwards along the radial direction, the first drill rod joint comprises a first structure part, a second structure part and a third structure part which are sequentially connected, the third structure part is connected with the drill rod body, the inner diameter of one end, away from the drill rod body, of the third structure part is the same as that of the second structure part, an internal thread is arranged at one end, away from the drill rod body, of the first structure part, and the internal thread of the first structure part is gradually contracted along the inner diameter of the drill rod body;
the two ends of the outer diameter of the second drill rod joint are retracted inwards along the radial direction, the second drill rod joint comprises a fourth structure part and a fifth structure part which are sequentially connected, the fourth structure part is connected with the drill rod body, and the inner diameter of one end, deviating from the drill rod body, of the fourth structure part is the same as that of the fifth structure part;
the outer diameter of the drill rod body is
The inner diameter of the drill rod body is
The first drill rod joint has an outer diameter of
The first tool joint has an inner diameter of
The second drill rod joint has an outer diameter of
The second tool joint has an inner diameter of
In some preferred technical solutions, the first drill rod joint is a drill rod female joint, the second drill rod joint is a drill rod male joint, the drill rod female joint and the drill rod male joint are respectively installed on the left side and the right side of the drill rod body, and an external thread is arranged at one end of the fifth structure portion, which is away from the drill rod body.
In some preferred embodiments, the drill rod body has an outer diameter sized between 101mm and 102mm and an inner diameter sized between 82.1mm and 84.5 mm.
In some preferred embodiments, the outer diameter of the first slip joint and the outer diameter of the second slip joint are set between 138.8mm and 140.6mm, and the inner diameter of the first slip joint and the inner diameter of the second slip joint are set between 82.1mm and 83.1 mm.
In some preferred technical solutions, the outer diameter of the drill rod body is 101.6 mm.
In some preferred technical solutions, the inner diameter of the drill rod body is 83.0 mm.
In some preferred embodiments, the first and second pipe joints have an outside diameter dimension of 139.7 mm.
In some preferred embodiments, the first and second tool joints have an inner diameter dimension of 82.6 mm.
In some preferred technical solutions, the internal thread of the first structural part and the external thread of the fifth structural part are both first threads, and a base thread pitch diameter of the first threads is set between 100mm and 121 mm.
In some preferred embodiments, the preferred size of the base thread pitch diameter of the first thread is set between 115mm and 116 mm.
The invention has the beneficial effects that:
according to the large-water-hole light workover drill rod, on the premise of ensuring tensile strength and torsional strength through strength calculation, the wall thickness of the drill rod body is reduced, the inner diameter of the drill rod body is increased, the inner diameter of a drill rod joint is increased, and the weight of the drill rod is reduced. According to the requirements of workover operation, the drilling tool combination formed by the method can replace a 4 '+ 31/2' +27/8 'drilling tool combination in the construction of the XJ850 workover rig, has large inner diameter, large displacement and light weight compared with the 4' +31/2 '+ 27/8' drilling tool combination, can reduce the displacement loss of drilling fluid in a drill pipe, and meets the safe lifting load of the XJ850 workover rig.
The big light well workover drilling rod of water eye of this application has lower quality, compares the drilling tool among the prior art, and the drilling string quality of the big light well workover drilling rod of water eye of this application is lighter, accords with the safe handling load of rig, and this application uses under the certain prerequisite of load at the rig, allows the drilling string longer, can reach the purpose of restoreing the more dark degree of depth.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of the overall structure of a large-bore light workover drill pipe according to an embodiment of the present invention;
list of reference numerals:
1 a first tool joint internal thread; 2-a first pipe joint; 3, friction welding a welding seam between the first drill rod joint and the drill rod body; 4-a drill rod body; 5, friction welding a welding seam between the second drill rod joint and the drill rod body; 6-a second pipe joint; 7-a second drill rod joint external thread.
Detailed Description
In order to make the embodiments, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The invention discloses a large-water-hole light workover drill rod, which comprises a drill rod body, a first drill rod joint and a second drill rod joint, wherein the first drill rod joint and the second drill rod joint are respectively arranged at two ends of the drill rod body;
the inner walls of two pipe ends of the drill rod body are retracted inwards along the radial direction, the first drill rod joint comprises a first structure part, a second structure part and a third structure part which are sequentially connected, the third structure part is connected with the drill rod body, the inner diameter of one end, away from the drill rod body, of the third structure part is the same as that of the second structure part, an internal thread is arranged at one end, away from the drill rod body, of the first structure part, and the internal thread of the first structure part is gradually contracted along the inner diameter of the drill rod body;
the two ends of the outer diameter of the second drill rod joint are retracted inwards along the radial direction, the second drill rod joint comprises a fourth structure part and a fifth structure part which are sequentially connected, the fourth structure part is connected with the drill rod body, and the inner diameter of one end, deviating from the drill rod body, of the fourth structure part is the same as that of the fifth structure part;
the outer diameter of the drill rod body is
The inner diameter of the drill rod body is
The first drill rod joint has an outer diameter of
The first tool joint has an inner diameter of
The second drill rod joint has an outer diameter of
The second tool joint has an inner diameter of
According to the technical scheme, the inner diameter of the workover drill rod is the drift diameter. The outer diameter can be determined by a person skilled in the art according to actual use requirements, the outer diameters of the drill rod joints at two ends are the largest when the drill rod is drilled down, and in order to prevent the outer diameters of the drill rod joints from colliding with the inner wall of a borehole, the outer diameters of the joints are smaller than the inner diameter of the borehole, and a certain gap is reserved between the outer diameters and the inner diameter of the borehole. Simultaneously, the outer diameter of the joint is not small, the outer diameter of the joint is small, the wall thickness of the joint is reduced, namely, the wall thickness of the threaded connection part is reduced, and the threaded connection strength is influenced.
For a clearer explanation of the present invention, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As a preferred embodiment of the present invention, the large-bore light workover drill rod of the present invention, as shown in fig. 1, includes a drill rod body 4, and a first drill rod joint 2 and a second drill rod joint 6 respectively disposed at the left and right ends of the drill rod body 4, preferably, the connection manner of the first drill rod joint 2 and the drill rod body 4 is welding, and a flat thickening friction welding process is disclosed in this application. Referring to figure 1, a first drill rod joint and drill rod body friction welding seam 3 is shown, a second drill rod joint 6 and a drill rod body 4 are connected in a welding mode, and a second drill rod joint and drill rod body friction welding seam 5 is shown in the figure.
Wherein, two pipe end inner walls of the drill rod body 4 are inwards contracted along the radial direction, and correspondingly, the pipe wall thickness at two ends of the drill rod body is larger than the thickness of the center of the pipe body. The drill rod body 4 of the present application has an outer diameter of
Such as: 100mm, 101mm, 101.6mm, 102.3mm, 103mm, etc. The inner diameter of the drill rod body 4 is
Such as 82mm, 83mm, 84mm, 85mm, etc.
The first drill rod joint 2 is a drill rod female joint and comprises a first structure part, a second structure part and a third structure part which are sequentially connected, the third structure part is connected with the drill rod body 4, one end of the inner diameter of the third structure part, which deviates from the drill rod body 4, is the same as the inner diameter of the second structure part, and the first structureOne end of the part departing from the drill rod body 4 is provided with an internal thread, namely a first drill rod joint internal thread 1 as shown in the figure, and the first drill rod joint internal thread 1 is gradually contracted along the inner diameter of the drill rod body 4. The first tool joint 2 has an outer diameter of
Preferably 130.2mm, 133.4mm, 139.7mm, 142.9mm, etc. The first tool joint 2 has an inner diameter of
Such as 81.2mm, 82.6mm, 83.5mm, 84.7mm, etc.
The outside diameter both ends of second tool joint 6 are along radially adduction, and second tool joint 6 is including the fourth structural part and the fifth structural part that connect gradually, and the fourth structural part is connected with drilling rod body 4, and the one end that the fourth structural part deviates from drilling rod body 4 is the same with the internal diameter of fifth structural part, and the one end external diameter that the fifth structural part deviates from drilling rod body 4 is provided with the screw thread, and this screw thread is as shown in the figure second tool joint external screw thread 7 promptly. The second tool joint 6 has an outer diameter of
Such as 130.2mm, 133.4mm, 139.7mm, 142.9mm, etc.; the second tool joint 6 has an inner diameter of
Such as 81.2mm, 82.6mm, 83.5mm, 84.7mm, etc.
Further, the first drill rod joint internal thread 1 and the second drill rod joint external thread 7 are both first threads. The first thread is a BHDX thread having a base thread pitch diameter set between 100mm and 121mm, such as 103mm, 108mm, 115mm, 119mm, etc.
Preferably, the preferred size of the fundamental thread pitch diameter of the BHDX threads is set from 115mm to 116mm, such as 115.23mm, 115.49mm, 115.76mm, etc. In a preferred embodiment of the present application, the base thread pitch diameter of the BHDX threads is 115.57 mm.
In some preferred embodiments, the outer diameter of rod body 4 is preferably sized between 101mm and 102mm, such as 101.2mm, 101.4mm, 101.6mm, 101.8mm, etc. The inner diameter of the drill rod body 4 is preferably dimensioned between 82.1mm and 84.5mm, such as: 82.4mm, 83mm, 83.5mm, etc. Further, the outer diameter of the first drill pipe joint 2 and the outer diameter of the second drill pipe joint 6 are set between 138.8mm and 140.6mm, such as: 139.0mm, 139.4mm, 139.7mm, 140.3mm and the like; and the inner diameter of the first drill rod joint 2 and the inner diameter of the second drill rod joint 6 are set between 82.1mm and 83.1mm, such as: 82.3mm, 82.6mm, 82.9mm, etc. The utility model provides a product appearance size does not have the circular bead when the external diameter keeps unanimous and can guarantee using in first tool joint and the second tool joint, and the fluid is through smooth and easy at the drilling rod internal and external surface. Simultaneously, this application internal diameter size compares current workover drilling rod bigger, can guarantee that the fluid is obstructed for a short time when the drilling rod is inside to pass through.
More preferably, the drill pipe body has an outer diameter dimension of 101.6mm, the drill pipe body has an inner diameter dimension of 83.0mm, and the first and second drill pipe joints 2, 6 have an outer diameter dimension of 139.7 mm. The inner diameter of the first and second pipe joints 2, 6 is 82.6 mm. The workover drill rod of the preferred embodiment of the application has sufficient tensile strength, torsional strength and fatigue resistance under the combined size of the drill rod body and the drill rod joint, can meet the requirements of various unconventional drilling and special drilling processes, and provides guarantee for the safety and the speed and the efficiency of drilling.
In the technical solution in the embodiment of the present application, at least the following technical effects and advantages are provided:
according to the large-water-hole light workover drill rod, on the premise of ensuring tensile strength and torsional strength through strength calculation, the wall thickness of the drill rod body is reduced, the inner diameter of the drill rod body is increased, the inner diameter of a drill rod joint is increased, and the weight of the drill rod is reduced. According to the requirements of workover operation, the drilling tool combination formed by the method can replace a 4 '+ 31/2' +27/8 'drilling tool combination in the construction of the XJ850 workover rig, has large inner diameter, large displacement and light weight compared with the 4' +31/2 '+ 27/8' drilling tool combination, can reduce the displacement loss of drilling fluid in a drill pipe, and meets the safe lifting load of the XJ850 workover rig. The on-site experiment proves that the invention has enough tensile strength and torsional strength, good fatigue resistance and longer service life. Can meet the requirements of various unconventional well drilling and special well drilling processes, and provides guarantee for the safety and the speed and the efficiency of well drilling.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A large-water-hole light workover drill rod is characterized by comprising a drill rod body, a first drill rod joint and a second drill rod joint, wherein the first drill rod joint and the second drill rod joint are respectively arranged at two ends of the drill rod body;
the inner walls of two pipe ends of the drill rod body are retracted inwards along the radial direction, the first drill rod joint comprises a first structure part, a second structure part and a third structure part which are sequentially connected, the third structure part is connected with the drill rod body, the inner diameter of one end, away from the drill rod body, of the third structure part is the same as that of the second structure part, an internal thread is arranged at one end, away from the drill rod body, of the first structure part, and the internal thread of the first structure part is gradually contracted along the inner diameter of the drill rod body;
the two ends of the outer diameter of the second drill rod joint are retracted inwards along the radial direction, the second drill rod joint comprises a fourth structure part and a fifth structure part which are sequentially connected, the fourth structure part is connected with the drill rod body, and the inner diameter of one end, deviating from the drill rod body, of the fourth structure part is the same as that of the fifth structure part;
the outer diameter of the drill rod body is
The inner diameter of the drill rod body is
The first drill rod joint has an outer diameter of
The first tool joint has an inner diameter of
The second drill rod joint has an outer diameter of
The second tool joint has an inner diameter of
2. The large-water-hole light workover drill rod according to claim 1, wherein the first drill rod joint is a drill rod female joint, the second drill rod joint is a drill rod male joint, the drill rod female joint and the drill rod male joint are respectively arranged on the left side and the right side of the drill rod body, and one end, away from the drill rod body, of the fifth structure portion is provided with an external thread.
3. The large bore lightweight well intervention drill pipe of claim 2, wherein the outer diameter of the drill pipe body is sized between 101mm and 102mm and the inner diameter of the drill pipe body is sized between 82.1mm and 84.5 mm.
4. The large bore lightweight workover drill pipe of claim 3 wherein the outer diameter dimension of the first drill pipe joint and the outer diameter dimension of the second drill pipe joint are set between 138.8mm and 140.6mm and the inner diameter dimension of the first drill pipe joint and the inner diameter dimension of the second drill pipe joint are set between 82.1mm and 83.1 mm.
5. The large bore lightweight well intervention drill pipe of claim 1, wherein the outer diameter dimension of the drill pipe body is 101.6 mm.
6. The large bore lightweight well intervention drill pipe of claim 5, wherein the inner diameter dimension of the drill pipe body is 83.0 mm.
7. The large bore light weight well intervention drill pipe of claim 1, wherein the first and second drill pipe joints have an outer diameter dimension of 139.7 mm.
8. The large bore lightweight well intervention drill pipe of claim 7, wherein the first and second drill pipe joints have an inner diameter dimension of 82.6 mm.
9. The large bore light weight workover drill string of claim 2, wherein the internal threads of the first structure and the external threads of the fifth structure are first threads, and a base thread pitch diameter dimension of the first threads is set between 100mm and 121 mm.
10. The large bore light weight well intervention drill pipe of claim 9, wherein the preferred dimension of the base thread pitch diameter of the first thread is set between 115mm and 116 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110127937.5A CN112878925A (en) | 2021-01-29 | 2021-01-29 | Large water hole light well repairing drill rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110127937.5A CN112878925A (en) | 2021-01-29 | 2021-01-29 | Large water hole light well repairing drill rod |
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| Publication Number | Publication Date |
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| CN112878925A true CN112878925A (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110127937.5A Pending CN112878925A (en) | 2021-01-29 | 2021-01-29 | Large water hole light well repairing drill rod |
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Citations (9)
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|---|---|---|---|---|
| US6012744A (en) * | 1998-05-01 | 2000-01-11 | Grant Prideco, Inc. | Heavy weight drill pipe |
| CN102373887A (en) * | 2010-08-23 | 2012-03-14 | 宝山钢铁股份有限公司 | Drill rod and manufacture method thereof |
| CN202755907U (en) * | 2012-08-12 | 2013-02-27 | 西安长庆石油工具制造有限责任公司 | Drill pipe structure with big bit port |
| US20140209394A1 (en) * | 2013-01-28 | 2014-07-31 | Vam Drilling Usa, Inc. | Shale drill pipe |
| CN104487650A (en) * | 2012-06-27 | 2015-04-01 | 奥德菲尔欧洲服务有限公司 | Drill string mountable wellbore cleanup apparatus and method |
| CN105696948A (en) * | 2016-04-08 | 2016-06-22 | 中石化石油工程技术服务有限公司 | Drill rod for well repair side tracking |
| US20160208561A1 (en) * | 2013-09-09 | 2016-07-21 | Sandvik Intellectual Property Ab | Drill string component |
| US20180187496A1 (en) * | 2017-01-05 | 2018-07-05 | Douglas Kinsella | Drill pipe |
| CN109826569A (en) * | 2019-01-30 | 2019-05-31 | 南通永大管业股份有限公司 | Boring rod set is rotated in the middle part of big hydrophthalmia |
-
2021
- 2021-01-29 CN CN202110127937.5A patent/CN112878925A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6012744A (en) * | 1998-05-01 | 2000-01-11 | Grant Prideco, Inc. | Heavy weight drill pipe |
| CN102373887A (en) * | 2010-08-23 | 2012-03-14 | 宝山钢铁股份有限公司 | Drill rod and manufacture method thereof |
| CN104487650A (en) * | 2012-06-27 | 2015-04-01 | 奥德菲尔欧洲服务有限公司 | Drill string mountable wellbore cleanup apparatus and method |
| CN202755907U (en) * | 2012-08-12 | 2013-02-27 | 西安长庆石油工具制造有限责任公司 | Drill pipe structure with big bit port |
| US20140209394A1 (en) * | 2013-01-28 | 2014-07-31 | Vam Drilling Usa, Inc. | Shale drill pipe |
| US20160208561A1 (en) * | 2013-09-09 | 2016-07-21 | Sandvik Intellectual Property Ab | Drill string component |
| CN105696948A (en) * | 2016-04-08 | 2016-06-22 | 中石化石油工程技术服务有限公司 | Drill rod for well repair side tracking |
| US20180187496A1 (en) * | 2017-01-05 | 2018-07-05 | Douglas Kinsella | Drill pipe |
| CN109826569A (en) * | 2019-01-30 | 2019-05-31 | 南通永大管业股份有限公司 | Boring rod set is rotated in the middle part of big hydrophthalmia |
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| Title |
|---|
| 张然等: "超深井用Φ149.2+mm高抗扭钻杆研制与应用", 钢管, vol. 50, no. 1, 28 February 2021 (2021-02-28), pages 23 - 28 * |
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