CN214886906U - Tandem type nipple joint of drill rod for horizontal well deflecting - Google Patents
Tandem type nipple joint of drill rod for horizontal well deflecting Download PDFInfo
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- CN214886906U CN214886906U CN202022943809.1U CN202022943809U CN214886906U CN 214886906 U CN214886906 U CN 214886906U CN 202022943809 U CN202022943809 U CN 202022943809U CN 214886906 U CN214886906 U CN 214886906U
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Abstract
The invention discloses a tandem type short section for a drill rod for horizontal well deflecting, which comprises a transmission part and a bearing supporting part relative to a horizontal well; wherein, the transmission part includes: the lock comprises a male connector (2), a lock sleeve (6), an outer shell (3) and a butt joint (11); the bearing support part comprises a bearing which is fixed at any position outside the drill pipe short section in an encircling manner. The invention transmits torque by circumferential limit of the joint of the male joint and the lock sleeve, and then forms axial limit by screwing the butt joint detachably fixed outside the lock sleeve and the straight rod part at the front end of the male joint to prevent the drill pipe short sections from moving. And the ball head at the rear part of the male joint is in universal connection with the lock sleeve to ensure that the drill rod short section rotates to a certain angle to complete the horizontal well deflecting operation. The invention is suitable for the trend of the well wall, overcomes the resistance of the well wall and ensures the stable drilling. The bearing which is abutted with the horizontal well wall is arranged outside the drill rod, so that the sliding resistance is changed into the rolling resistance, and the friction resistance torque borne by the drill rod is reduced.
Description
Technical Field
The invention relates to the field of design and manufacture of horizontal well drilling tools, in particular to a tandem type short section of a drilling rod for horizontal well deflection.
Background
Horizontal wells are special wells having a maximum well deviation angle of up to or near 90 (typically no less than 86) and maintaining a horizontal well section of a certain length in the zone of interest. Sometimes the angle of inclination may exceed 90 deg., for certain special needs, "upturned". Generally, horizontal wells are suitable for thin hydrocarbon reservoirs or fractured hydrocarbon reservoirs with the aim of increasing the exposed area of the hydrocarbon reservoir. In the drilling process, the drill rod is rotated by a certain angle to adapt to the trend of the well wall, and the resistance of the well wall needs to be overcome to ensure the stable drilling. Wherein the drill rod nipple joint has the nipple joint to change trouble, work efficiency low grade problem as the loss piece in the drilling rod. The problems of large friction resistance torque of a drill rod and the like exist in the drilling process along with the continuous increase of the number of horizontal wells and the length of a horizontal section.
Disclosure of Invention
The invention aims to solve the problems of troublesome replacement of a short section of a drill rod, large friction torque, low working efficiency and the like.
In order to achieve the purpose, the invention provides a tandem type short section for a drill rod for horizontal well deflecting, which comprises a male joint, a lock sleeve and an outer shell, wherein the front part of the male joint is a straight rod section, the rear part of the male joint is a ball head, the lock sleeve is provided with a front end spherical cavity for accommodating the ball head, and the outer shell is sleeved outside the tail end of the straight rod section of the male joint and is provided with an annular end cover at the front end of the ball head for clamping the ball head. The rear part of the outer shell is a cylindrical shell which is detachably sleeved outside the lock sleeve; the rear end of the lock sleeve is provided with a column hole for accommodating the straight rod section of the male joint, and the short sections are sequentially connected through a butt joint which is detachably sleeved at the end side; the butt joint is provided with a threaded hole for screwing the threaded section on the straight rod section of the male joint. The male connector and the lock sleeve are provided with through center holes. The outer shell, the lock sleeve and the whole peripheral surface of the butt joint are sleeved with the bearing sleeve on an annular section through rolling bodies arranged at intervals in the circumferential direction. The lock sleeve and the ball head part of the male joint which are connected in a matched mode are provided with notches for containing steel balls at intervals in the circumferential direction.
For the better rotation moment of torsion of transmission drilling rod, the straight pole section of male joint with the lock sleeve detachable cup joints together, preferably, set up a plurality of keyways in the post hole of lock sleeve rear end and be used for the joint the key that corresponds on the straight pole section of male joint.
The rolling body and the bearing sleeve can be combined and arranged at any position on the outer shell, the lock sleeve and the whole peripheral surface of the butt joint, and considering that the clearance between the outer diameter of the drill rod short section and the horizontal well wall is limited, the outer diameter of the lock sleeve is closest to the outer diameter of the drill rod, preferably, the rolling body and the bearing sleeve are arranged at the periphery of the lock sleeve between the outer shell and the butt joint.
In order to ensure that the male joint and the lock sleeve are synchronously transmitted in the circumferential direction and rotate around the ball center of the ball head within a certain angle range, it is preferable that the upper parts of the notches of the lock sleeve and the ball head of the male joint are long circular grooves which are axially arranged, and the lower parts of the notches are through holes for allowing the steel balls to pass through.
The rolling elements have various forms such as balls, needles, etc., and in order to improve mechanical transmission efficiency and reduce mechanical damage, it is preferable that the rolling elements be needles.
The male connector and the lock sleeve are rotated around the spherical center of the ball head, so that the flow rate and the circulation rate of the drilling fluid are not influenced, and a preferred mode is that the rear section of the central hole of the male connector is gradually enlarged into a bell mouth.
Drilling fluid flows through the center hole between the short sections which are connected in series, so a sealing device is arranged on the part where the drilling fluid flows, preferably, a first sealing ring is arranged at the front end of the straight rod of the male connector, and a second sealing ring is arranged at the rear end of the joint of the ball head of the male connector and the hemispherical socket-shaped opening of the lock sleeve.
The first sealing ring and the second sealing ring are of V type, Y type, O type and the like, and in order to facilitate installation and disassembly, preferably, the first sealing ring and the second sealing ring are O-shaped sealing rings.
According to the invention, the butt joint is connected with the straight rod part at the front end of the male joint in series and screwed to form the drill rod, and the male joint and the circumferentially arranged keys and key grooves of the lock sleeve transmit torque. The ball head parts of the lock sleeve and the male joint are provided with notches for accommodating steel balls at intervals in the circumferential direction, the male joint and the lock sleeve are kept in synchronous transmission in the circumferential direction, the male joint rotates in a certain angle range in the axial direction relative to the lock sleeve, and therefore the drill pipe pups connected in series can be guaranteed to bend according to the requirement of horizontal well deflecting operation so as to adapt to the trend of a well wall and overcome the resistance of the well wall, and drilling stability is guaranteed. Wherein the drill rod nipple joint is easy to replace and meets the requirement of torque transmission, and the working efficiency is obviously improved. The rolling bodies and the bearing sleeves are circumferentially arranged at intervals on any one annular section of the whole peripheral surface of the outer shell, the lock sleeve and the butt joint, so that the sliding resistance is changed into the rolling resistance, the friction resistance torque borne by the drill rod is reduced, and the drilling difficulty is reduced.
Drawings
FIG. 1 is a schematic view of a main view and a half-section structure of a tandem type short section of the drill rod for horizontal well deflecting, which is disclosed by the invention.
Fig. 2 is a schematic front-view half-section structure diagram of a ball head of the tandem type nipple for the drill rod for horizontal well deflecting.
Fig. 3 is a schematic cross-sectional view a-a of fig. 2 of the present invention.
Fig. 4 is a schematic cross-sectional view at B-B of fig. 2 in accordance with the present invention.
Fig. 5 is a schematic front-view half-section structure diagram of an outer shell of the tandem sub for the drill rod for horizontal well deflecting.
Fig. 6 is a schematic front view and a half-section structure of the locking sleeve of the tandem type short section of the drill rod for horizontal well deflecting.
Fig. 7 is a schematic cross-sectional view at C-C of fig. 6 of the present invention.
Fig. 8 is a schematic cross-sectional view at D-D of fig. 6 in accordance with the present invention.
Fig. 9 is a schematic front view and a half-section structure of the bearing sleeve of the tandem sub for the drill rod for horizontal well deflecting.
Fig. 10 is a schematic front view and a half-section structure of the butt joint of the tandem sub for the drill rod for horizontal well deflecting.
Fig. 11 is a schematic structural view of an internal hexagonal flat end set screw of the tandem sub for the drill rod for horizontal well deflecting.
Fig. 12 is a schematic side view of the inner hexagonal flat end set screw of the tandem sub for the drill rod for horizontal well deflecting according to the present invention.
Wherein: 1. a first seal ring; 2. a male connector; 3. an outer housing; 4. a steel ball; 5. a second seal ring (5); 6. a lock sleeve; 7. a first inner hexagonal flat end fastening screw; 8. a bearing housing; 9. a rolling body; 10. a second inner hexagonal flat end fastening screw; 11. and (4) butt joint.
Detailed Description
Example 1:
as shown in fig. 1-2, 5 and 10, the tandem type short section for the drill rod for horizontal well deflecting comprises a male joint 2 with a straight rod section at the front part and a ball head at the rear part, a lock sleeve 6 with a spherical cavity at the front end for accommodating the ball head, and an outer shell 3 which is sleeved outside the tail end of the straight rod section of the male joint 2 and is provided with an annular end cover at the front end of the ball head for clamping the ball head. The rear part of the outer shell 3 is a cylindrical shell and is fixedly sleeved outside the lock sleeve 6 through a first inner hexagonal flat end set screw. The male connector and the lock sleeve are provided with through center holes. The rear section of the central hole of the male connector 2 is gradually enlarged into a bell mouth, and in order to meet the requirement that drilling fluid is generally supplied to the central hole, the male connector 2 and the lock sleeve 6 rotate around the spherical center of the ball head, and the circulation volume and the circulation rate of the drilling fluid are not influenced by the form of the bell mouth.
As shown in fig. 1 to 4 and fig. 7 to 9, notches for accommodating the steel balls 5 are arranged at intervals in the circumferential direction at the ball head part of the male joint 2 of the lock sleeve 6 in the fitting connection. The upper part of the notch is a long circular groove which is axially arranged, and the lower part of the notch is a through hole which allows the steel ball 5 to pass through. In order to better transmit the rotation torque of the drill rod, a plurality of key grooves are arranged in a column hole at the rear end of the lock sleeve 6 and used for clamping corresponding keys on a straight rod section of the male connector 2. The bearing sleeve 8 is sleeved on the position, between the outer shell and the butt joint, of the outer peripheral surface of the locking sleeve 6 through the rolling bodies 9 arranged at intervals in the circumferential direction, sliding friction between the outer wall of the drill pipe nipple and the wall of a horizontal well is changed into rolling friction, friction torque is reduced, and meanwhile the service life of the drill pipe nipple is prolonged. The rolling bodies 9 are rolling needles, so that the mechanical transmission efficiency is improved, and the mechanical damage is reduced. Front end open ring groove and embedded first sealing washer of 2 straight-bars of male joint, 2 bulb of male joint with the rear end open ring groove and the embedded second sealing washer of 6 hemisphere nest form mouthful junctions of lock tube prevent to concatenate it has the drilling fluid to reveal the invasion to the transmission part to circulate in the centre bore between the nipple joint. The first sealing ring and the second sealing ring are all O-shaped sealing rings, so that the installation and the disassembly are convenient.
As shown in fig. 6, the rear end of the lock sleeve 6 is provided with a column hole for accommodating the straight rod section of the male joint 2, and the connection of the short sections in sequence is realized through a butt joint 11 which is sleeved on the end side in a manner of being fixed by a second hexagon socket flat-end set screw 10.
As shown in fig. 10, the butt joint 11 is provided with a threaded hole for screwing the threaded section on the straight rod section of the male joint.
Example 2:
as shown in fig. 1-2, 5 and 10, the tandem type short section for the drill rod for horizontal well deflecting comprises a male joint 2 with a straight rod section at the front part and a ball head at the rear part, a lock sleeve 6 with a spherical cavity at the front end for accommodating the ball head, and an outer shell 3 which is sleeved outside the tail end of the straight rod section of the male joint 2 and is provided with an annular end cover at the front end of the ball head for clamping the ball head. The rear part of the outer shell 3 is a cylindrical shell and is fixedly sleeved outside the lock sleeve 6 through a first inner hexagonal flat end set screw. The male connector and the lock sleeve are provided with through center holes. The rear section of the central hole of the male connector 2 is gradually enlarged into a bell mouth, and in order to meet the requirement that drilling fluid is generally supplied to the central hole, the male connector 2 and the lock sleeve 6 rotate around the spherical center of the ball head, and the circulation volume and the circulation rate of the drilling fluid are not influenced by the form of the bell mouth.
As shown in fig. 1 to 4 and fig. 7 to 9, notches for accommodating the steel balls 5 are arranged at intervals in the circumferential direction at the ball head part of the male joint 2 of the lock sleeve 6 in the fitting connection. The upper part of the notch is a long circular groove which is axially arranged, and the lower part of the notch is a through hole which allows the steel ball 5 to pass through. In order to better transmit the rotation torque of the drill rod, a plurality of key grooves are arranged in a column hole at the rear end of the lock sleeve 6 and used for clamping corresponding keys on a straight rod section of the male connector 2. The bearing sleeve 8 is sleeved on the position, between the outer shell and the butt joint, of the outer peripheral surface of the locking sleeve 6 through the rolling bodies 9 arranged at intervals in the circumferential direction, sliding friction between the outer wall of the drill pipe nipple and the wall of a horizontal well is changed into rolling friction, friction torque is reduced, and meanwhile the service life of the drill pipe nipple is prolonged. The rolling bodies 9 are balls, so that the mechanical transmission efficiency is improved, and the mechanical damage is reduced. Front end open ring groove and embedded first sealing washer of 2 straight-bars of male joint, 2 bulb of male joint with the rear end open ring groove and the embedded second sealing washer of 6 hemisphere nest form mouthful junctions of lock tube prevent to concatenate it has the drilling fluid to reveal the invasion to the transmission part to circulate in the centre bore between the nipple joint. The first sealing ring and the second sealing ring are all O-shaped sealing rings, so that the installation and the disassembly are convenient.
As shown in fig. 6, the rear end of the lock sleeve 6 is provided with a column hole for accommodating the straight rod section of the male joint 2, and the connection of the short sections in sequence is realized through a butt joint 11 which is sleeved on the end side in a manner of being fixed by a second hexagon socket flat-end set screw 10.
As shown in fig. 10, the butt joint 11 is provided with a threaded hole for screwing the threaded section on the straight rod section of the male joint.
Example 3:
as shown in fig. 1-2, 5 and 10, the tandem type short section for the drill rod for horizontal well deflecting comprises a male joint 2 with a straight rod section at the front part and a ball head at the rear part, a lock sleeve 6 with a spherical cavity at the front end for accommodating the ball head, and an outer shell 3 which is sleeved outside the tail end of the straight rod section of the male joint 2 and is provided with an annular end cover at the front end of the ball head for clamping the ball head. The rear part of the outer shell 3 is a cylindrical shell and is fixedly sleeved outside the lock sleeve 6 through a first inner hexagonal flat end set screw. The male connector and the lock sleeve are provided with through center holes. The rear section of the central hole of the male connector 2 is gradually enlarged into a bell mouth, and in order to meet the requirement that drilling fluid is generally supplied to the central hole, the male connector 2 and the lock sleeve 6 rotate around the spherical center of the ball head, and the circulation volume and the circulation rate of the drilling fluid are not influenced by the form of the bell mouth.
As shown in fig. 1 to 4 and fig. 7 to 9, notches for accommodating the steel balls 5 are arranged at intervals in the circumferential direction at the ball head part of the male joint 2 of the lock sleeve 6 in the fitting connection. The upper part of the notch is a long circular groove which is axially arranged, and the lower part of the notch is a through hole which allows the steel ball 5 to pass through. In order to better transmit the rotation torque of the drill rod, a plurality of key grooves are arranged in a column hole at the rear end of the lock sleeve 6 and used for clamping corresponding keys on a straight rod section of the male connector 2. The bearing sleeve 8 is sleeved with the rolling bodies 9 arranged at intervals in the peripheral direction of the outer shell 3, the sliding friction between the outer wall of the drill rod nipple and the wall of a horizontal well is changed into rolling friction, and the service life of the drill rod nipple is prolonged while the friction resistance torque is reduced. The rolling bodies 9 are rolling needles, so that the mechanical transmission efficiency is improved, and the mechanical damage is reduced. Front end open ring groove and embedded first sealing washer of 2 straight-bars of male joint, 2 bulb of male joint with the rear end open ring groove and the embedded second sealing washer of 6 hemisphere nest form mouthful junctions of lock tube prevent to concatenate it has the drilling fluid to reveal the invasion to the transmission part to circulate in the centre bore between the nipple joint. The first sealing ring and the second sealing ring are all O-shaped sealing rings, so that the installation and the disassembly are convenient.
As shown in fig. 6, the rear end of the lock sleeve 6 is provided with a column hole for accommodating the straight rod section of the male joint 2, and the connection of the short sections in sequence is realized through a butt joint 11 which is sleeved on the end side in a manner of being fixed by a second hexagon socket flat-end set screw 10.
As shown in fig. 10, the butt joint 11 is provided with a threaded hole for screwing the threaded section on the straight rod section of the male joint.
Example 4:
as shown in fig. 1-2, 5 and 10, the tandem type short section for the drill rod for horizontal well deflecting comprises a male joint 2 with a straight rod section at the front part and a ball head at the rear part, a lock sleeve 6 with a spherical cavity at the front end for accommodating the ball head, and an outer shell 3 which is sleeved outside the tail end of the straight rod section of the male joint 2 and is provided with an annular end cover at the front end of the ball head for clamping the ball head. The rear part of the outer shell 3 is a cylindrical shell and is fixedly sleeved outside the lock sleeve 6 through a first inner hexagonal flat end set screw. The male connector and the lock sleeve are provided with through center holes. The rear section of the central hole of the male connector 2 is gradually enlarged into a bell mouth, and in order to meet the requirement that drilling fluid is generally supplied to the central hole, the male connector 2 and the lock sleeve 6 rotate around the spherical center of the ball head, and the circulation volume and the circulation rate of the drilling fluid are not influenced by the form of the bell mouth.
As shown in fig. 1 to 4 and fig. 7 to 9, notches for accommodating the steel balls 5 are arranged at intervals in the circumferential direction at the ball head part of the male joint 2 of the lock sleeve 6 in the fitting connection. The upper part of the notch is a long circular groove which is axially arranged, and the lower part of the notch is a through hole which allows the steel ball 5 to pass through. In order to better transmit the rotation torque of the drill rod, a plurality of key grooves are arranged in a column hole at the rear end of the lock sleeve 6 and used for clamping corresponding keys on a straight rod section of the male connector 2. The bearing sleeve 8 is sleeved with the rolling bodies 9 circumferentially arranged on the whole peripheral surface of the butt joint 11 at intervals, so that the sliding friction between the outer wall of the drill pipe nipple and the wall of a horizontal well is changed into rolling friction, the friction torque is reduced, and the service life of the drill pipe nipple is prolonged. The rolling bodies 9 are rolling needles, so that the mechanical transmission efficiency is improved, and the mechanical damage is reduced. Front end open ring groove and embedded first sealing washer of 2 straight-bars of male joint, 2 bulb of male joint with the rear end open ring groove and the embedded second sealing washer of 6 hemisphere nest form mouthful junctions of lock tube prevent to concatenate it has the drilling fluid to reveal the invasion to the transmission part to circulate in the centre bore between the nipple joint. The first sealing ring and the second sealing ring are all O-shaped sealing rings, so that the installation and the disassembly are convenient.
As shown in fig. 6, the rear end of the lock sleeve 6 is provided with a column hole for accommodating the straight rod section of the male joint 2, and the connection of the short sections in sequence is realized through a butt joint 11 which is sleeved on the end side in a manner of being fixed by a second hexagon socket flat-end set screw 10.
As shown in fig. 10, the butt joint 11 is provided with a threaded hole for screwing the threaded section on the straight rod section of the male joint.
The technical requirements related to each part in the embodiments 1 to 4 are as follows:
the technical requirements of the male connector 2 are as follows:
1. quenching and tempering: HB is 280-310 of the total weight of the alloy,
2. and (3) no chamfering: 0.5 multiplied by 45 degrees, the other edges and corners are blunt,
3. surface ion nitriding treatment, and taking protective measures for the screw thread during nitriding.
Technical requirements of the outer shell 3:
1. quenching and tempering: HB is 280-310 of the total weight of the alloy,
2. and (3) no chamfering: 0.5 multiplied by 45 degrees, the other edges and corners are blunt,
3. and (5) surface phosphating treatment.
The technical requirements of the lock sleeve 6 are as follows:
1. quenching and tempering: HB is 280-310 of the total weight of the alloy,
2. and (3) no chamfering: 0.5 multiplied by 45 degrees, the other edges and corners are blunt,
3. surface ion nitriding treatment, and taking protective measures for the screw thread during nitriding.
The technical requirements of the first inner hexagonal flat end set screw 7 and the second inner hexagonal flat end set screw 10 are as follows:
and (5) outsourcing standard parts (the performance grade is more than or equal to 12.9).
The technical requirements of the bearing sleeve 8 are as follows:
1. quenching and tempering: HB is 280-310 of the total weight of the alloy,
2. chamfering edges: 0.5X 45 degrees,
3. and (5) performing surface ion nitriding treatment.
Technical requirements of the butt joint 11:
1. quenching and tempering: HB is 280-310 of the total weight of the alloy,
2. and (3) no chamfering: 1.5 multiplied by 45 degrees, the other edges and corners are blunt,
3. and (5) surface phosphating treatment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (8)
1. The tandem type short section for the drill rod for horizontal well deflecting is characterized by comprising a male joint (2) with a straight rod section at the front part and a ball head at the rear part, a lock sleeve (6) with a ball head accommodating cavity at the front end, and an outer shell (3) which is sleeved outside the tail end of the straight rod section of the male joint (2) and forms an annular end cover at the front end of the ball head to clamp the ball head;
the rear part of the outer shell (3) is a cylindrical shell which is detachably sleeved outside the lock sleeve (6); the rear end of the lock sleeve (6) is provided with a column hole for accommodating the straight rod section of the male joint (2), and the short sections are sequentially connected through a butt joint (11) which is detachably sleeved at the end side; the butt joint (11) is provided with a threaded hole for screwing a threaded section on a straight rod section of the male joint (2);
the male connector (2) and the lock sleeve (6) are provided with through center holes;
the bearing sleeve (8) is sleeved on the outer peripheral surface of the whole body of the outer shell (3), the lock sleeve (6) and the butt joint (11) through rolling bodies (9) arranged at intervals in the circumferential direction on an annular section;
the lock sleeve (6) and the ball head part of the male connector (2) which are connected in a matched mode are respectively provided with notches for containing the steel balls (4) at intervals in the circumferential direction.
2. The tandem-type short section for the drill rod for horizontal well deflecting according to claim 1, characterized in that a plurality of key slots are arranged in a column hole at the rear end of the lock sleeve (6) and used for clamping corresponding keys on a straight rod section of the male joint (2).
3. The tandem sub for a drill rod for horizontal well whipstock according to claim 1, characterized in that the rolling bodies (9) and the bearing sleeve (8) are arranged at a position of the periphery of the lock sleeve (6) between the outer casing (3) and the butt joint (11).
4. The tandem sub for a drill rod for horizontal well deflecting according to claim 1, characterized in that the upper part of the notch of the locking sleeve (6) and the ball head of the male joint (2) is an axially-opened long circular groove, and the lower part is a through hole for allowing the steel ball (4) to pass through.
5. The tandem sub for a drill rod for horizontal well whipstock according to claim 1, characterized in that the rolling bodies (9) are roller pins.
6. The tandem sub for a drill rod for horizontal well deflecting according to claim 1, characterized in that the rear section of the central hole of the male joint (2) is gradually enlarged into a bell mouth.
7. The tandem-type short section for the drill rod for horizontal well deflecting according to claim 1, characterized in that a first sealing ring (1) is arranged at the front end of a straight rod of the male joint (2), and a second sealing ring (5) is arranged at the rear end of the joint of the ball head of the male joint (2) and the hemispherical socket-shaped opening of the lock sleeve (6).
8. The tandem sub for a drill rod for horizontal well deflecting according to claim 7, characterized in that the first sealing ring (1) and the second sealing ring (5) are both O-shaped sealing rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022943809.1U CN214886906U (en) | 2020-12-10 | 2020-12-10 | Tandem type nipple joint of drill rod for horizontal well deflecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022943809.1U CN214886906U (en) | 2020-12-10 | 2020-12-10 | Tandem type nipple joint of drill rod for horizontal well deflecting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214886906U true CN214886906U (en) | 2021-11-26 |
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ID=78904092
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022943809.1U Active CN214886906U (en) | 2020-12-10 | 2020-12-10 | Tandem type nipple joint of drill rod for horizontal well deflecting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214886906U (en) |
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2020
- 2020-12-10 CN CN202022943809.1U patent/CN214886906U/en active Active
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