CN209523724U - A kind of slim-hole reversible fishing socket - Google Patents
A kind of slim-hole reversible fishing socket Download PDFInfo
- Publication number
- CN209523724U CN209523724U CN201920160890.0U CN201920160890U CN209523724U CN 209523724 U CN209523724 U CN 209523724U CN 201920160890 U CN201920160890 U CN 201920160890U CN 209523724 U CN209523724 U CN 209523724U
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- Prior art keywords
- transition joint
- cylinder
- hole
- pushing cylinder
- slim
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- 230000002441 reversible effect Effects 0.000 title claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 54
- 210000000078 claw Anatomy 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 241001463139 Vitta Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Abstract
The utility model discloses a kind of slim-hole reversible fishing sockets.It solves the problems, such as existing outer fishing combined tool, and there is salvaging, range is small, bonding strength is poor.It includes the top connection, transition joint and mandrel cylinder of sequentially coaxially releasable connection, one annular piston, which slides axially, to be arranged in the annular chamber by being formed between top connection and transition joint outer wall, the driving end of pushing cylinder is connected with the annular piston, radial claw is equipped on mandrel cylinder, it is equipped with voussoir on the outer wall of the crimped end of radial claw, is equipped with inclined-plane in the push side of pushing cylinder.The utility model structure is simple, occupies little space,, by driving annular piston driving pushing cylinder axial movement, the inclined-plane of pushing cylinder push side, which pushes voussoir, tightens radial claw axially for it, can will be stepped up by the tubing string of card, and then grab and pull well out, design is rationally, bonding strength is good, operating efficiency is high.
Description
Technical field
The utility model relates in wellbore or well salvage or exclude object grappling tool technical field, especially one
Kind slim-hole reversible fishing socket.
Background technique
It is known that in the drilling operations of slim hole well, because its casing inner diameter is small, situation is complicated in well, Shi You
The case where bit freezing, occurs, and since the gap between drilling tool coupling and casing is smaller, becomes needs for being salvaged by the tubing string of card
One of major issue of solution.
People often use left hand fishing spear fishing oil pipe, and because shaft and connector are to be threadedly coupled, bonding strength, oil pipe is easily loose
De-, selection can carry out activity unfreezing, back-off using returnable fishing spear, though meeting intensity requirement, it inverts the special construction exited
It can not invert unfreezing junk, easily be disengaged at fishing lance slips when operation, oil pipe still can not unfreezing.
Common fishing lance there is no efficient unfreezing ability for only vitta structure, be equipped with the contents such as cable to inside
There are no conducts for the oil pipe of object.
It is not difficult to find that it is small to salvage range because stressed member is cylinder for the outer fishing combined tool of existing conventional structure；And small size
Outer fishing combined tool not can guarantee bonding strength again.
To meet the needs of current slim-hole underground construction and fishing, how to develop that a kind of structure is reliable, operation letter
It is single, the use of safe reversible fishing socket is drilling well practitioner urgent problem to be solved instantly.
Utility model content
In order to overcome the shortcomings of the outer fishing combined tool of existing conventional structure, range is small, bonding strength is poor there is salvaging, for
Slim hole well has the characteristics that annular space gap is small, it is size-constrained to enter well apparatus, the utility model provide it is a kind of design rationally,
Salvage the slim-hole reversible fishing socket that range is big, bonding strength is good, operating efficiency is high.
The above-mentioned technical purpose of the utility model has the technical scheme that
A kind of slim-hole reversible fishing socket, the transition joint of top connection and a tubular including a tubular；
The transition joint and top connection are coaxially disposed, and transition joint releasable connection is on the inner wall of top connection；
Slim-hole reversible fishing socket further includes a mandrel cylinder, several radial claws, annular piston and pushing cylinder, the mandrel
Cylinder is with transition joint coaxial arrangement and mandrel cylinder includes a fixing end and an elongated end, and the fixing end releasable connection of mandrel cylinder is in
Between on connector；
One end of the transition joint and top connection are socketed, and the other end and mandrel cylinder of the transition joint are socketed；
It is equipped with an annular chamber between the top connection and transition joint, is extended radially through in transition joint equipped with one and annular
The logical pressure hole that chamber is connected, annular piston, which slides axially, to be arranged in annular chamber, and pushing cylinder, which slides axially, is sleeved on transition joint
On outer wall, pushing cylinder includes that driving end and push side, the driving end of pushing cylinder protrude into annular chamber and be connected with annular piston；
The radial direction claw includes a connecting pin and a crimped end, and the connecting pin of radial claw is arranged on mandrel cylinder,
The outer wall of radial claw crimped end is equipped with voussoir, is equipped with inclined-plane in the push side of the pushing cylinder, which matches with voussoir.
Further, the elongated end of the mandrel cylinder extends to side of the voussoir far from pushing cylinder；
It is provided with annular groove on the outer wall of the mandrel cylinder, ring slider, the radial direction are equipped in the annular groove
The connecting pin of claw is fixed on ring slider；
It is provided with slotted hole on the ring slider, pin is equipped on pushing cylinder wall corresponding with slotted hole and the pin is stretched
Enter in slotted hole.
Further, corresponding to voussoir on the elongated end of the mandrel cylinder equipped with inclined-plane.
Further, annular baffle ring is equipped on the outer wall of the mandrel cylinder fixing end, in the drive of the annular baffle ring and pushing cylinder
Reset spring is equipped between moved end, the reset spring is sleeved in transition joint.
Further, being equipped with sealing ring on the annular piston and the contact surface of top connection.
Further, being equipped with sealing ring on the annular piston and the contact surface of transition joint.
Further, being equipped with sealing ring on the contact surface of the top connection and transition joint.
Further, the outer peripheral surface diameter of the pushing cylinder is equal with the outer peripheral surface diameter of top connection.
In conclusion the utility model has the following beneficial effects: the utility model is by driving annular piston driving to push away
Cylinder axial movement, the inclined-plane of pushing cylinder push side, which pushes voussoir, tightens radial claw axially, has that structure is simple, occupies little space
The advantages of；The utility model can salvage the bit freezing in slim hole well, and salvaging range is big, operating efficiency is high.
Detailed description of the invention
Fig. 1 is the utility model structural front view；
Fig. 2 is the partial enlarged view in Fig. 1 at A；
Fig. 3 is the partial enlarged view in Fig. 1 at B；
Fig. 4 is the partial enlarged view in Fig. 1 at C.
In figure, 1, top connection；2, transition joint；21, lead to pressure hole；3, mandrel cylinder；31, fixing end；32, elongated end；33, ring
Shape sliding slot；4, radial claw；41, connecting pin；42, crimped end；43, voussoir；5, annular chamber；6, annular piston；7, annular baffle ring；
8, pushing cylinder；81, end is driven；82, push side；83, inclined-plane；9, reset spring；10, sealing ring；11, tubing string；12, ring slider；
121, slotted hole；13, pin.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
Embodiment 1
As shown in Figure 1, a kind of slim-hole reversible fishing socket comprising the top connection 1 of a tubular and the centre of a tubular
Connector 2.
Transition joint 2 and top connection 1 are coaxially disposed, and transition joint 2 is through being threaded on the inner wall of top connection 1.
As shown in Figure 1, the utility model further includes a mandrel cylinder 3, several radial claws 4, annular piston 6 and pushing cylinder 8.
Wherein, mandrel cylinder 3 and transition joint 2 are coaxially disposed, and one end of the transition joint 2 and top connection 1 are socketed, described
The other end and mandrel cylinder 3 of transition joint 2 are socketed.
Mandrel cylinder 3 include a fixing end 31 and an elongated end 32, the fixing end 31 of mandrel cylinder 3 be threaded in indirectly
On first 2, an annular chamber 5 is equipped between top connection 1 and transition joint 2, annular piston 6, which slides axially, to be arranged in annular chamber 5,
Pushing cylinder 8, which slides axially, to be sleeved on the outer wall of transition joint 2, and pushing cylinder 8 includes driving end 81 and push side 82, the driving of pushing cylinder 8
End 81 protrudes into annular chamber 5 and is connected with annular piston 6.
For convenient for drive annular piston 6, as shown in Fig. 2, being extended radially through in transition joint 2 equipped with one and 5 phase of annular chamber
The logical pressure hole 21 of connection, pressure fluid drawing-in top connection 1 protrudes into transition joint 2 and is connected with logical pressure hole 21, by annular
6 axially reciprocating of annular piston can be driven in injection or extraction pressure fluid in chamber 5.
It is set with a pushing cylinder 8 as shown in Figure 1, sliding axially on the outer wall of transition joint 2, the driving end 81 of the pushing cylinder 8
It protrudes into annular chamber 5 and is connected with annular piston 6.
As shown in Figure 1, radial claw 4 includes a connecting pin 41 and a crimped end 42, the connecting pin 41 of radial claw 4 is arranged
On mandrel cylinder 3, voussoir 43 is equipped on the outer wall of the crimped end 42 of radial 4 crimped end 42 of claw, in the push side 82 of pushing cylinder 8
Equipped with inclined-plane 83, which matches with voussoir 43.When the push side 82 of pushing cylinder 8 presses to voussoir 43,43 stress of voussoir
4 radial contraction of radial claw is guided, achievees the purpose that clamp stuck pipe column 11.
In the present embodiment, the use of the new type drives 8 axial action of pushing cylinder by annular piston 6,8 push side 82 of pushing cylinder
Inclined-plane 83, which pushes voussoir 43, makes the axial tightening of radial claw 4, and salvaging range is big, operating efficiency is high.
Embodiment 2
On the basis of embodiment 1, as shown in Figure 1, Figure 3, the elongated end 32 of mandrel cylinder 3 extends to voussoir 43 far from pushing cylinder
8 side corresponds to the inclined-plane 83 that voussoir 43 is equipped with cooperation on the elongated end 32 of mandrel cylinder 3.
As shown in figure 4, being provided with annular groove 33 on the outer wall of mandrel cylinder 3, it is sliding that annular is equipped in the annular groove 33
The connecting pin 41 of block 12, radial claw 4 is fixed on ring slider 12.
Meanwhile slotted hole 121 is provided on ring slider 12, pin is equipped on 8 wall of pushing cylinder corresponding with slotted hole 121
13 and the pin 13 protrude into slotted hole 121.
In the present embodiment, the voussoir 43 of radial claw 4 is by two sides stress, further increase radial claw 4 with by card
The bonding strength of tubing string 11.
Embodiment 3
As Figure 1 and Figure 4, annular baffle ring 7 is equipped on the outer wall of 3 fixing end 31 of mandrel cylinder, in the annular baffle ring 7 and
Reset spring 9 is equipped between the driving end 81 of pushing cylinder 8, reset spring 9 is sleeved in transition joint 2.Reset spring 9 is in pushing cylinder 8
It is to push pushing cylinder 8 close to top connection 1 after pressure fluid unloads power by compress energy storage far from top connection 1.
In the present embodiment, reset spring 9 can accelerate the discharge of pressure fluid in logical pressure hole 21, make radial claw 4 quickly
It resets.
Embodiment 4
On the basis of embodiment 1, in Fig. 1, Fig. 2, in the contact surface of annular piston 6 and top connection 1, transition joint 2
On be respectively equipped with sealing ring 10, sealing ring 10 is equipped on the contact surface of top connection 1 and transition joint 2.
In the present embodiment, annular chamber 5 can be improved to the sealing performance of pressure fluid in the setting of sealing ring 10, makes annular work
6 movement of plug is more accurate, strong.
Embodiment 5
The outer peripheral surface diameter of pushing cylinder 8 and the outer peripheral surface diameter of top connection 1 are equal.
In the present embodiment, pushing cylinder 8 can protrude into slim hole well with top connection 1, and can guarantee the coaxial of the utility model
Degree will not grab fishing because of the excessive influence of 8 volume of pushing cylinder.
Embodiment 6
As shown in Figure 1, a kind of slim-hole reversible fishing socket comprising the top connection 1 of a tubular and the centre of a tubular
Connector 2.Transition joint 2 and top connection 1 are coaxially disposed, and transition joint 2 is through being threaded on the inner wall of top connection 1.
As shown in Figure 1, the utility model further includes a mandrel cylinder 3, several radial claws 4, annular piston 6 and pushing cylinder 8.Its
In, mandrel cylinder 3 and transition joint 2 are coaxially disposed, and one end of transition joint 2 and top connection 1 are socketed, the transition joint 2 it is another
One end and mandrel cylinder 3 are socketed.
Mandrel cylinder 3 include a fixing end 31 and an elongated end 32, the fixing end 31 of mandrel cylinder 3 be threaded in indirectly
On first 2, an annular chamber 5 is equipped between top connection 1 and transition joint 2, annular piston 6, which slides axially, to be arranged in annular chamber 5,
Pushing cylinder 8, which slides axially, to be sleeved on the outer wall of transition joint 2, and pushing cylinder 8 includes driving end 81 and push side 82, the driving of pushing cylinder 8
End 81 protrudes into annular chamber 5 and is connected with annular piston 6.
For convenient for drive annular piston 6, as shown in Fig. 2, being extended radially through in transition joint 2 equipped with one and 5 phase of annular chamber
The logical pressure hole 21 of connection, pressure fluid drawing-in top connection 1 protrudes into transition joint 2 and is connected with logical pressure hole 21, by annular
6 axially reciprocating of annular piston can be driven in injection or extraction pressure fluid in chamber 5.
It is to be appreciated that accelerate the discharge of pressure fluid in logical pressure hole 21, as Figure 1 and Figure 4, in 3 fixing end of mandrel cylinder
31 outer wall is equipped with annular baffle ring 7, and reset spring 9 is equipped between the annular baffle ring 7 and the driving end 81 of pushing cylinder 8, resets
Spring 9 is sleeved in transition joint 2.Reset spring 9 is to unload power in pressure fluid by compress energy storage far from top connection 1 in pushing cylinder 8
Push pushing cylinder 8 close to top connection 1 afterwards.
As shown in Figure 1, the outer peripheral surface diameter of pushing cylinder 8 is equal with the outer peripheral surface diameter of top connection 1.It can guarantee this when entering well
The concentricity of utility model and slim hole well.
In Fig. 1, Fig. 2, annular piston 6 and top connection 1, transition joint 2 contact surface on be respectively equipped with sealing ring 10,
Sealing ring 10 is equipped on the contact surface of top connection 1 and transition joint 2, annular chamber 5 can be improved to pressure in the setting of sealing ring 10
The sealing performance of fluid acts annular piston 6 more accurate, strong.
It is set with a pushing cylinder 8 as shown in Figure 1, sliding axially on the outer wall of transition joint 2, the driving end 81 of the pushing cylinder 8
It protrudes into annular chamber 5 and is connected with annular piston 6；Radial claw 4 includes a connecting pin 41 and a crimped end 42, radial claw 4
Connecting pin 41 be arranged on mandrel cylinder 3, on the outer wall of radial 4 crimped end 42 of claw be equipped with voussoir 43, in the pushing of pushing cylinder 8
End 82 is equipped with inclined-plane 83, which matches with voussoir 43.When the push side 82 of pushing cylinder 8 presses to voussoir 43, voussoir 43
Stress guides 4 radial contraction of radial claw, achievees the purpose that clamp stuck pipe column 11.
For the bonding strength for further increasing radial claw 4 and stuck pipe column 11, as shown in Figure 1, Figure 3, mandrel cylinder 3 prolongs
It stretches end 32 and extends to side of the voussoir 43 far from pushing cylinder 8, voussoir 43 is corresponded on the elongated end 32 of mandrel cylinder 3 and is equipped with the oblique of cooperation
Face 83 is equipped with ring slider as shown in figure 4, being provided with annular groove 33 on the outer wall of mandrel cylinder 3 in the annular groove 33
12, the connecting pin 41 of radial claw 4 is fixed on ring slider 12, meanwhile, slotted hole 121 is provided on ring slider 12,
8 wall of pushing cylinder corresponding with slotted hole 121 is equipped with pin 13 and the pin 13 protrudes into slotted hole 121.
When in use, the utility model is dropped down onto the slim hole well of bit freezing, and is sleeved on mandrel cylinder 3 by the tubing string of card
On 11, the pump-in pressure fluid into annular chamber 5, annular piston 6 drives 8 axial action of pushing cylinder, the inclined-plane 83 of 8 push side 82 of pushing cylinder
Pushing voussoir 43 makes the axial tightening of radial claw 4；Meanwhile 8 wall of pushing cylinder is equipped with pin 13 and pushes ring slider 12 in mandrel cylinder 3
Sliding in the annular groove 33 being provided on outer wall, ring slider 12 push radial claw 4 connected to it, voussoir 43 are made to protrude into core
The elongated end 32 of beam barrel 3 simultaneously cooperates with corresponding inclined-plane 83；With 8 axial action of pushing cylinder, radial 4 axial shrinkage amount of claw is gradually
Increase, until will be clamped by the tubing string 11 of card, and then grabs and pull well out.The utility model is designed reasonably, bonding strength are good, salvage
Range is big, operating efficiency is high.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used for solving in the present embodiment
It releases in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if this is specific
When posture changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being related to " first ", " second " etc. is used for description purposes only, it is not understood to indicate or imply
Its relative importance or the quantity for implicitly indicating indicated technical characteristic.The spy of " first ", " second " is defined as a result,
Sign can explicitly or implicitly include at least one of the features.
Technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not within the protection scope of the requires of the utility model.
Claims (8)
1. a kind of slim-hole reversible fishing socket comprising the top connection (1) of a tubular and the transition joint (2) of a tubular, institute
It states transition joint (2) and top connection (1) to be coaxially disposed, and transition joint (2) releasable connection is on the inner wall of top connection (1),
It is characterized in that:
The slim-hole reversible fishing socket further includes a mandrel cylinder (3), several radial claws (4), annular piston (6) and pushing cylinder
(8), the mandrel cylinder (3) and transition joint (2) are coaxially disposed and mandrel cylinder (3) includes a fixing end (31) and an elongated end
(32), fixing end (31) releasable connection of mandrel cylinder (3) is in the upper of transition joint (2)；
One end and top connection (1) of the transition joint (2) are socketed, and the other end of the transition joint (2) and mandrel cylinder (3) cover
It connects；
An annular chamber (5) are equipped between the top connection (1) and transition joint (2), extends radially through and is equipped on transition joint (2)
The one logical pressure hole (21) being connected with annular chamber (5), annular piston (6) slide axially setting in annular chamber (5), pushing cylinder (8)
It slides axially and is sleeved on the outer wall of transition joint (2), pushing cylinder (8) includes driving end (81) and push side (82), pushing cylinder (8)
Driving end (81) protrudes into annular chamber (5) and is connected with annular piston (6)；
The radial direction claw (4) includes a connecting pin (41) and a crimped end (42), and the connecting pin (41) of radial claw (4) is arranged
On mandrel cylinder (3), voussoir (43) are equipped on the outer wall of radial claw (4) crimped end (42), the pushing in the pushing cylinder (8)
(82) are held to be equipped with inclined-plane (83), which matches with voussoir (43).
2. a kind of slim-hole reversible fishing socket according to claim 1, it is characterised in that: mandrel cylinder (3) prolong
Stretch the side that end (32) extends to voussoir (43) separate pushing cylinder (8)；
Annular groove (33) are provided on the outer wall of the mandrel cylinder (3), are equipped with ring slider (12) in annular groove (33),
The connecting pin (41) of the radial direction claw (4) is fixed on ring slider (12)；
It is provided with slotted hole (121) on the ring slider (12), is equipped on pushing cylinder (8) wall corresponding with slotted hole (121)
Pin (13) and pin (13) protrude into slotted hole (121).
3. a kind of slim-hole reversible fishing socket according to claim 2, it is characterised in that: the extension in mandrel cylinder (3)
Voussoir (43) are corresponded on end (32) equipped with inclined-plane (83).
4. a kind of slim-hole reversible fishing socket according to claim 1, it is characterised in that: solid in the mandrel cylinder (3)
The outer wall of fixed end (31) is equipped with annular baffle ring (7), is equipped between the annular baffle ring (7) and the driving end (81) of pushing cylinder (8)
Reset spring (9), the reset spring (9) are sleeved on transition joint (2).
5. a kind of slim-hole reversible fishing socket according to claim 1, it is characterised in that: in the annular piston (6)
Sealing ring (10) are equipped with the contact surface of top connection (1).
6. a kind of slim-hole reversible fishing socket according to claim 1, it is characterised in that: in the annular piston (6)
Sealing ring (10) are equipped with the contact surface of transition joint (2).
7. a kind of slim-hole reversible fishing socket according to claim 1, it is characterised in that: the top connection (1) with
The contact surface of transition joint (2) is equipped with sealing ring (10).
8. a kind of slim-hole reversible fishing socket according to claim 1, it is characterised in that: the periphery of the pushing cylinder (8)
Face diameter is equal with the outer peripheral surface diameter of top connection (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920160890.0U CN209523724U (en) | 2019-01-30 | 2019-01-30 | A kind of slim-hole reversible fishing socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920160890.0U CN209523724U (en) | 2019-01-30 | 2019-01-30 | A kind of slim-hole reversible fishing socket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209523724U true CN209523724U (en) | 2019-10-22 |
Family
ID=68230086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920160890.0U Active CN209523724U (en) | 2019-01-30 | 2019-01-30 | A kind of slim-hole reversible fishing socket |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209523724U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555497A (en) * | 2019-01-30 | 2019-04-02 | 中国石油集团川庆钻探工程有限公司 | A kind of slim-hole reversible fishing socket and application method |
-
2019
- 2019-01-30 CN CN201920160890.0U patent/CN209523724U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555497A (en) * | 2019-01-30 | 2019-04-02 | 中国石油集团川庆钻探工程有限公司 | A kind of slim-hole reversible fishing socket and application method |
| CN109555497B (en) * | 2019-01-30 | 2024-01-19 | 中国石油天然气集团有限公司 | Small well-hole retractable overshot and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201125 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: 610056 No.6, mengzhuiwan street, Chenghua District, Chengdu, Sichuan 610056 Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |
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| TR01 | Transfer of patent right |