CN112031693A - Hydraulic pushing wellhead connecting device - Google Patents
Hydraulic pushing wellhead connecting device Download PDFInfo
- Publication number
- CN112031693A CN112031693A CN202010979656.8A CN202010979656A CN112031693A CN 112031693 A CN112031693 A CN 112031693A CN 202010979656 A CN202010979656 A CN 202010979656A CN 112031693 A CN112031693 A CN 112031693A
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- Prior art keywords
- ball
- cylinder
- locking
- hydraulic cylinder
- barrel
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- 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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- 230000000903 blocking effect Effects 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion
Abstract
The invention discloses a hydraulic pushing wellhead connecting device which comprises a main body and an upper end connector, wherein a locking hydraulic cylinder I, a locking hydraulic cylinder II, a ball barrel assembly and a ball pushing device are arranged on the main body; the wedge-shaped push block is connected to the locking hydraulic cylinder I through threads and attached to the inclined surface of the locking block, the locking block is pushed into the main body through linear motion of the locking hydraulic cylinder I, and the wedge-shaped push block is attached to and tightly presses the upper end connector; the locking ring is matched and fixed with a piston shoulder of the locking hydraulic cylinder II through a nut to move up and down so as to lock or unlock the locking block; the ball pushing device realizes the delivery of the fracturing balls through the linear motion of the ball pushing hydraulic cylinder; the ball barrel assembly is fixed on the main body, and the indication that all fracturing balls are delivered is achieved by retracting the indication flag into the ball barrel. The device can realize remote control and automatic butt joint, can throw balls for many times, ensures the operation safety of operators and reduces the labor intensity.
Description
Technical Field
The invention belongs to the technical field of oil and gas field acidizing and fracturing equipment, and particularly relates to a hydraulic pushing wellhead connecting device.
Background
The horizontal well and the staged fracturing can effectively improve the yield of the oil and gas well, and the oil and gas yield increasing and improving mode is widely applied in China. Before perforation fracturing is carried out, firstly, the blowout preventer pipe string is connected, an operator is generally required to climb up a platform, or the operator is conveyed to a wellhead position by using a lifting basket vehicle, a wellhead pressure cap is removed, the blowout preventer pipe string is lifted by using a crane and slowly moved to the wellhead position, the blowout preventer pipe string is aligned with the wellhead by manpower, and a connecting nut is manually screwed after the blowout preventer pipe string is slowly lowered by the crane. After the wellhead device is connected, the operator leaves the dangerous area and then starts operations such as perforation, fracturing and the like. After the operation of this well head is accomplished, still through artifical dismantlement nut, then the crane lifts by crane blowout preventer pipe cluster and moves to another well head and carry out the operation, so reciprocal.
In the operation process of the connection of the wellhead device, the connection nut is righted by manpower and then is screwed and disassembled, so that the labor intensity is high, and an operator is near the lower part of the suspension arm, and if a crane is commanded to make a mistake or the cooperation is improper, objects are easy to strike and hurt. Meanwhile, under the operating condition, the field operating personnel are in a high-pressure area at the wellhead position, so that greater safety risks exist.
Disclosure of Invention
The invention aims to provide a hydraulic pushing wellhead connecting device, which solves the problems that in the prior art, operators frequently go up a wellhead platform to operate, the workload is high, and high-pressure risks exist.
The technical scheme adopted by the invention is that the hydraulic pushing wellhead connecting device comprises a main body and an upper end connector, wherein the main body is provided with a locking hydraulic cylinder I, a locking hydraulic cylinder II, a ball barrel assembly and a ball pushing device; the main body comprises a base, a first cylindrical cylinder with a hollow inner part is arranged on the base, a middle cylinder with a hollow inner part and a cylindrical shape is arranged at the top of the cylindrical cylinder, a second cylindrical cylinder with a hollow inner part is arranged at the top of the middle cylinder, a horn-shaped wellhead lead-in device is arranged at the top of the second cylindrical cylinder, and an upper end joint is arranged in the wellhead lead-in device; a locking ring is arranged between the middle cylinder and the second cylindrical cylinder; the outer wall of the lower part of the second cylindrical barrel is provided with a plurality of rectangular holes; the locking blocks are all positioned in the rectangular holes; the locking hydraulic cylinder I is fixed on the lower bottom surface of the middle barrel through a bolt, the end part of a first piston rod of the locking hydraulic cylinder I is connected with the wedge-shaped push block through a first thread, and an inclined surface d of the wedge-shaped push block is attached to the locking block; and a second piston rod of the locking hydraulic cylinder II penetrates through the upper surface of the locking ring.
The present invention is also characterized in that,
the outer side wall of the middle cylinder is also provided with a plurality of rectangular grooves; the bottom of the rectangular groove is provided with a first round hole; a first piston rod of the locking hydraulic cylinder I extends out of the first round hole, and the wedge-shaped push block is located in the rectangular groove.
The outer side wall of the middle cylinder is also provided with a plurality of vertical grooves, the upper surface of the middle cylinder is also provided with a plurality of second round holes, and the second round holes are positioned above the vertical grooves; and the locking hydraulic cylinder II is fixed in the vertical groove through a first bolt, and the second piston rod sequentially passes through the second round hole and the upper surface of the locking ring.
Locking hydraulic cylinder I and locking hydraulic cylinder II all are provided with a plurality ofly and along circumference evenly distributed on the well section of thick bamboo.
The middle cylinder is also provided with a through hole which is communicated up and down; the ball barrel assembly comprises a ball barrel, a stop cap, an indicating ball, an indicating rod, an indicating flag, a rotating shaft, a nut, a connecting rope and a ball barrel cover; the ball cylinder is fixed in the through hole through threads, a ball cylinder cover is arranged at the top of the ball cylinder, a sliding groove is axially arranged on the outer wall of the ball cylinder, the connecting rope penetrates through the ball cylinder cover, and two ends of the connecting rope are respectively connected with the indicating ball and the blocking cap; the indicating rod is connected to the indicating ball through a rotating shaft and a nut and can rotate along the axis; an indication flag is arranged on the indication rod; the indicating rod can move up and down along the sliding groove.
The outer side wall of the middle cylinder is also provided with a third round hole; the ball pushing mechanism comprises a ball pushing hydraulic cylinder, an outer cylinder and a ball basket; the ball pushing hydraulic cylinder is connected with the outer cylinder through a second bolt and a second nut; the ball pushing hydraulic cylinder is horizontally fixed on the outer side wall of the middle cylinder, the outer cylinder extends into the third round hole, a third piston rod of the ball pushing hydraulic cylinder extends out of the outer cylinder, and the piston rod is connected with the ball basket through a second thread; the ball basket is positioned in the middle barrel and is positioned under the ball barrel.
The base is evenly provided with a plurality of connecting holes along circumference.
The invention has the beneficial effects that: the device can realize remote control and automatic butt joint, can throw balls for many times, ensures the operation safety of operators and reduces the labor intensity.
Drawings
FIG. 1 is a schematic illustration of a hydraulic push wellhead connection device of the present invention;
FIG. 2 is a schematic view (one) in half section of a hydraulic push wellhead connection device of the present invention;
FIG. 3 is a schematic view (two) in half section of a hydraulic push wellhead connection device of the present invention;
FIG. 4 is a schematic view (III) in half section of a hydraulic push wellhead connection device of the present invention;
FIG. 5 is a schematic illustration of the configuration of the body of a hydraulic push wellhead connection device of the present invention;
FIG. 6 is a schematic structural diagram of a ball barrel assembly in a hydraulic push wellhead connection device according to the present invention;
fig. 7 is a schematic structural diagram of a ball pushing device in the hydraulic pressure well head connecting device of the invention.
In the figure, 10 is a main body, 20 is an upper end joint, 30 is a locking block, 40 is a locking ring, 50 is a wedge-shaped pushing block, 60 is a locking hydraulic cylinder I, 70 is a locking hydraulic cylinder II, 80 is a ball barrel assembly, and 90 is a ball pushing device; 101. the first round hole, 102, the rectangular groove, 103, the rectangular hole, 104, the second round hole, 105, the through hole, 106, the third round hole, 107, the step surface a, 108, the inner cavity of the main body; 109. 1-1 parts of a connecting hole, 1-2 parts of a base, 1-2 parts of a first cylindrical cylinder, 1-3 parts of a middle cylinder, 1-4 parts of a second cylindrical cylinder, 1-5 parts of a wellhead importer, 1-6 parts of an inverted L-shaped groove and 1-7 parts of a vertical groove; 201. step surfaces b, 202, inclined surfaces a, 203 and a sealing structure; 301. bevel b, 302 bevel c; 501. a bevel d; 601. bolt, 602, first piston rod, 603, first thread; 701. a first bolt, 702, a shoulder, 703, a first nut, 704, a second piston rod; 801. the ball barrel comprises a ball barrel body, 802. a stop cap, 803. an indicating ball, 804. an indicating rod, 805. an indicating flag, 806. a rotating shaft, 807. a nut, 808. a connecting rope, 809. a ball barrel cover, 810. a sliding groove; 901. ball pushing hydraulic cylinder 902, outer cylinder 903, ball basket 904, second bolt 905, second nut 906, second thread 907, third piston rod 9021, boss 9031, slope e, 9032, slope f, 9033 and groove.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the hydraulic pushing wellhead connecting device mainly comprises a main body 10, an upper end connector 20, a locking block 30, a locking ring 40, a wedge-shaped pushing block 50, a locking hydraulic cylinder I60, a locking hydraulic cylinder II 70, a ball barrel assembly 80 and a ball pushing device 90.
Referring to fig. 4 and 5, a vertically-through main body inner cavity 108 is formed inside the main body 10, the main body 10 comprises a base 1-1, a first cylindrical cylinder 1-2 with a hollow inner part is arranged on the base 1-1, a middle cylinder 1-3 with a hollow inner part and a cylindrical shape is arranged at the top of the cylindrical cylinder 1-2, a second cylindrical cylinder 1-4 with a hollow inner part is arranged at the top of the middle cylinder 1-3, the diameters of the middle cylinders 1-3 are all larger than those of the first cylindrical cylinder 1-2 and the second cylindrical cylinder 1-4, a horn-shaped wellhead introducer 1-5 is arranged at the top of the second cylindrical cylinder 1-4, and an upper end connector 20 is arranged in the wellhead introducer 1-5;
the base 1-1 is uniformly provided with a plurality of connecting holes 109 along the circumferential direction; the connection hole 109 is used for docking with a wellhead device;
the outer wall of the middle cylinder 1-3 is symmetrically provided with inverted L-shaped grooves 1-6, and the outer side wall of the middle cylinder 1-3 is also provided with a plurality of rectangular grooves 102; the bottom of the rectangular groove 102 is provided with a first round hole 101;
the outer side wall of the middle cylinder 1-3 is also provided with a plurality of vertical grooves 1-7, the upper surface of the middle cylinder 1-3 is also provided with a plurality of second round holes 104, and the second round holes 104 are positioned above the vertical grooves 1-7;
the middle cylinder 1-3 is also provided with a through hole 105 which is communicated up and down; the outer side wall of the middle cylinder 1-3 is also provided with a third round hole 106; the outer wall of the lower part of the second cylindrical cylinder 1-4 is provided with a plurality of rectangular holes 103;
a locking ring 40 is arranged between the middle cylinder 1-3 and the second cylindrical cylinder 1-4;
as shown in fig. 2, a locking hydraulic cylinder i 60 is fixed on the lower bottom surface of the middle cylinder 1-3 through a bolt 601, a first piston rod 602 extends out of a first round hole 101 on the middle cylinder 1-3, the end of the first piston rod 602 is connected with a wedge-shaped push block 50 through a first thread 603, and the wedge-shaped push block 50 is located in a rectangular groove 102; the inclined surface d501 of the wedge-shaped push block 50 is attached to the inclined surface b301 of the locking block 30 to push the locking block 30 into the rectangular hole 103; as shown in fig. 3, the locking hydraulic cylinder ii 70 is fixed in the vertical groove 1-7 of the middle cylinder 1-3 by the first bolt 701, and the second piston rod 704 passes through the second round hole 104 and the upper surface of the locking ring 40 in sequence; the locking ring 40 reciprocates along with the second piston rod 704 of the locking hydraulic cylinder II 70 under the combined action of the piston shoulder 702 of the locking hydraulic cylinder II 70 and the first nut 703 so as to lock or unlock the locking block 30;
the locking hydraulic cylinders I60 and the locking hydraulic cylinders II 70 are arranged in plurality and are uniformly distributed on the middle cylinders 1-3 along the circumferential direction;
as shown in fig. 2 and 4, after the upper end connector 20 extends into the inner cavity 108 of the main body, the step surface b201 falls on the step surface a107 of the inner hole of the main body, the inclined surface a202 is attached to the inclined surface c302 of the locking block under the action of the locking cylinder i to press the upper end connector, and the sealing structure 203 is arranged at the front end of the upper end connector 20 to seal the upper end connector and the main body 10.
Referring to fig. 5 and 6, the ball barrel assembly 80 mainly comprises a ball barrel 801, a stop cap 802, an indication ball 803, an indication rod 804, an indication flag 805, a rotating shaft 806, a nut 807, a connecting rope 808 and a ball barrel cover 809; the ball barrel 801 is fixed in the through hole 105 of the middle barrel 1-3 through threads, a ball barrel cover 809 is arranged at the top of the ball barrel 801, a sliding groove 810 is axially arranged on the outer wall of the ball barrel 801, a connecting rope 808 penetrates through the ball barrel cover 809, and the two ends of the connecting rope are respectively connected with the indicating ball 803 and the blocking cap 802; the indicating rod 804 is connected to the indicating ball 803 through a rotating shaft 806 and a nut 807, and can rotate along the axis; an indication flag 805 is arranged on the indication rod 804; the indicating rod 804 can move up and down along the sliding groove 810.
Referring to fig. 5 and 7, the ball pushing mechanism 90 is disposed on the outer side wall of the middle barrel 1-3 and close to the ball barrel assembly 80, and the ball pushing mechanism 90 mainly comprises a ball pushing cylinder 901, an outer barrel 902 and a ball basket 903; the ball pushing hydraulic cylinder 901 is connected with the outer cylinder 902 through a second bolt 904 and a second nut 905; the ball pushing hydraulic cylinder 901 is horizontally fixed on the outer side wall of the middle barrel 1-3, the outer barrel 902 is positioned in the third round hole 106, a third piston rod 907 of the ball pushing hydraulic cylinder 901 sequentially extends out of the outer barrel 902, and the piston rod 907 is connected with the ball basket 903 through a second thread 906; the ball basket 903 is positioned in the middle cylinder 1-3, and the ball basket 903 is positioned under the ball cylinder 801;
the inclined plane e9031 and the inclined plane f9032 on the basketball goal 903 are used for preventing the basketball goal 903 from being blocked in the reciprocating motion; the groove 9033 on the basketball 903 is matched with the boss 9021 on the outer cylinder, so that the basketball 903 is prevented from rotating in the reciprocating motion.
The invention relates to a hydraulic pushing wellhead connecting device, which has the specific working principle that:
when the pitching operation is needed, the locking cylinder II piston 704 drives the locking ring 40 to move upwards, and the locking of the locking block 30 is released; restoring the piston rod 601 of the locking hydraulic cylinder I to the initial position; lifting the upper end connector 20 to be above the step surface 107 of the main body, wherein the inclined surface a202 of the upper end connector is attached to the inclined surface c302 of the locking block, and pushing the locking block 30 to exit the main body; the upper cover 809 of the ball barrel is opened, a plurality of fracturing balls are loaded from the ball barrel 801 and sequentially fall into a cylindrical channel formed by the ball barrel 801 and the ball basket 903, and the indicating ball 803 is placed on the fracturing balls; the ball pushing hydraulic cylinder piston rod 907 drives the ball basket 903 to move forwards, and after the ball basket 903 enters the inner cavity 108 of the main body, the fracturing ball falls into the inner cavity 108 of the main body from the inner hole 9034 of the ball basket; after all the fracturing balls are put in, the indicating ball 803 falls into the ball basket 903, the indicating rod 804 is limited by the ball barrel sliding groove 810 and cannot fall down, and the indicating flag 805 retracts into the ball barrel 801.
Claims (7)
1. The hydraulic pushing wellhead connecting device is characterized by comprising a main body (10) and an upper end connector (20), wherein a locking hydraulic cylinder I (60), a locking hydraulic cylinder II (70), a ball barrel assembly (80) and a ball pushing device (90) are mounted on the main body (10); the main body (10) comprises a base (1-1), a first cylindrical cylinder (1-2) with a hollow inner part is arranged on the base (1-1), a middle cylinder (1-3) with a hollow inner part and a cylindrical shape is arranged at the top of the cylindrical cylinder (1-2), a second cylindrical cylinder (1-4) with a hollow inner part is arranged at the top of the middle cylinder (1-3), a horn-shaped well mouth lead-in device (1-5) is arranged at the top of the second cylindrical cylinder (1-4), and an upper end joint (20) is arranged in the well mouth lead-in device (1-5); a locking ring (40) is arranged between the middle cylinder (1-3) and the second cylindrical cylinder (1-4); the outer wall of the lower part of the second cylindrical cylinder (1-4) is provided with a plurality of rectangular holes (103); the locking blocks (30) are all positioned in the rectangular holes (103); the locking hydraulic cylinder I (60) is fixed to the lower bottom surface of the middle barrel (1-3) through a bolt (601), the end of a first piston rod (602) of the locking hydraulic cylinder I (60) is connected with the wedge-shaped push block (50) through a first thread (603), and an inclined surface d (501) of the wedge-shaped push block (50) is attached to the locking block (30); and a second piston rod (704) of the locking hydraulic cylinder II (70) penetrates through the upper surface of the locking ring (40).
2. A hydraulic push wellhead connection device according to claim 1 characterized in that the outer side wall of the middle cylinder (1-3) is further provided with a plurality of rectangular grooves (102); the bottom of the rectangular groove (102) is provided with a first round hole (101); a first piston rod (602) of the locking hydraulic cylinder I (60) extends out of the first round hole (101), and the wedge-shaped push block (50) is located in the rectangular groove (102).
3. A hydraulic push wellhead connection device according to claim 2 characterized in that the outer side wall of the middle cylinder (1-3) is further provided with a plurality of vertical slots (1-7), the upper surface of the middle cylinder (1-3) is further provided with a plurality of second round holes (104), and the second round holes (104) are positioned above the vertical slots (1-7); the locking hydraulic cylinder II (70) is fixed in the vertical grooves (1-7) through a first bolt (701), and the second piston rod (704) sequentially penetrates through the second round hole (104) and the upper surface of the locking ring (40).
4. A hydraulic push wellhead connection device according to claim 3 wherein there are a plurality of locking cylinders i (60) and ii (70) and are evenly distributed on the middle cylinder (1-3) in the circumferential direction.
5. A hydraulic push wellhead connection device according to claim 1 characterised in that the middle cylinder (1-3) is also provided with a through hole (105) running through it; the ball barrel assembly (80) comprises a ball barrel (801), a blocking cap (802), an indicating ball (803), an indicating rod (804), an indicating flag (805), a rotating shaft (806), a nut (807), a connecting rope (808) and a ball barrel cover (809); the ball barrel (801) is fixed in the through hole (105) through threads, a ball barrel cover (809) is arranged at the top of the ball barrel (801), a sliding groove (810) is axially arranged on the outer wall of the ball barrel (801), the connecting rope (808) penetrates through the ball barrel cover (809), and the two ends of the connecting rope are respectively connected with the indicating ball (803) and the blocking cap (802); the indicating rod (804) is connected to the indicating ball (803) through a rotating shaft (806) and a nut (807) and can rotate along the axis; an indication flag (805) is arranged on the indication rod (804); the indicating rod (804) can move up and down along the sliding groove (810).
6. A hydraulic push wellhead connection device according to claim 1 characterised in that the outer side wall of the middle cylinder (1-3) is also provided with a third circular hole (106); the ball pushing mechanism (90) comprises a ball pushing hydraulic cylinder (901), an outer cylinder (902) and a ball basket (903); the ball pushing hydraulic cylinder (901) is connected with the outer cylinder (902) through a second bolt (904) and a second nut (905); the ball pushing hydraulic cylinder (901) is horizontally fixed on the outer side wall of the middle barrel (1-3), the outer barrel (902) extends into the third round hole (106), a third piston rod (907) of the ball pushing hydraulic cylinder (901) extends out of the outer barrel (902), and the piston rod (907) is connected with the ball basket (903) through a second thread (906); the ball basket (903) is positioned in the middle barrel (1-3), and the ball basket (903) is positioned under the ball barrel (801).
7. A hydraulic push wellhead connection device according to claim 1 characterised in that the base (1-1) is evenly provided with a plurality of connection holes (109) in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010979656.8A CN112031693A (en) | 2020-09-17 | 2020-09-17 | Hydraulic pushing wellhead connecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010979656.8A CN112031693A (en) | 2020-09-17 | 2020-09-17 | Hydraulic pushing wellhead connecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112031693A true CN112031693A (en) | 2020-12-04 |
Family
ID=73589713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010979656.8A Pending CN112031693A (en) | 2020-09-17 | 2020-09-17 | Hydraulic pushing wellhead connecting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN112031693A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814607A (en) * | 2021-01-04 | 2021-05-18 | 中国石油天然气集团有限公司 | Perforation wellhead rapid reloading blowout prevention equipment and control method thereof |
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| US20120211219A1 (en) * | 2011-02-22 | 2012-08-23 | Stinger Wellhead Protection, Inc. | Horizontal frac ball injector |
| WO2015081092A2 (en) * | 2013-11-27 | 2015-06-04 | Weatherford/Lamb, Inc. | Ball dropper ball stack indicator |
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2020
- 2020-09-17 CN CN202010979656.8A patent/CN112031693A/en active Pending
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| US20120211219A1 (en) * | 2011-02-22 | 2012-08-23 | Stinger Wellhead Protection, Inc. | Horizontal frac ball injector |
| WO2015081092A2 (en) * | 2013-11-27 | 2015-06-04 | Weatherford/Lamb, Inc. | Ball dropper ball stack indicator |
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| WO2018089244A2 (en) * | 2016-11-08 | 2018-05-17 | Thru Tubing Solutions, Inc, | Plugging device deployment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814607A (en) * | 2021-01-04 | 2021-05-18 | 中国石油天然气集团有限公司 | Perforation wellhead rapid reloading blowout prevention equipment and control method thereof |
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Application publication date: 20201204 |