CN210918950U - Cutting device in drilling casing well - Google Patents
Cutting device in drilling casing well Download PDFInfo
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- CN210918950U CN210918950U CN201921431003.5U CN201921431003U CN210918950U CN 210918950 U CN210918950 U CN 210918950U CN 201921431003 U CN201921431003 U CN 201921431003U CN 210918950 U CN210918950 U CN 210918950U
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- tool bit
- main body
- main shaft
- guide sleeve
- accommodating cavity
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Abstract
The utility model relates to a cutting device in drill bushing well belongs to geological survey equipment technical field. The technical scheme is as follows: the guide sleeve (6), the main shaft (7) and the compression spring (10) are arranged in the tubular structure, the guide sleeve (6) is fixed on the main shaft, and the compression spring (10) is sleeved on the main shaft; the main body (13) is connected with the front end of the tubular structure, the tip (14) is inserted into a tool bit accommodating cavity (16) of the main body (13) through the front end opening of the main body (13), the front end of the main shaft enters the tool bit accommodating cavity of the main body through the rear end opening of the main body, the rear end of the tool bit (12) is hinged with the front end of the main shaft (7) through a pin shaft (11), and a tool bit extending port (17) communicated with the tool bit accommodating cavity is arranged on the side wall of the main body. The utility model discloses an actively the effect: the cutting-off operation can be carried out on the drill rod and the sleeve at any position in the drill hole, the drill rod and the sleeve which are stuck in the drill hole can be recovered to the greatest extent, and the cost is saved.
Description
Technical Field
The utility model relates to a cutting device in drill bushing well belongs to geological survey equipment technical field.
Background
When geological drilling construction is carried out and a complex and broken stratum is met, a casing pipe needs to be put in, when drilling is completed, the outer casing pipe is often clamped by broken stones, and sometimes, a drilling accident happens, and a drill pipe and a drilling tool are clamped in a dead drilling hole. The drill hole can not be recovered outside the drill hole, and only the drill sleeve can be abandoned in the drill hole, thereby causing unnecessary waste and environmental pollution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cutting device in drilling sleeve well installs in drilling rod column bottom, can stretch into by the dead sheathed tube inside of boring of card, and until reacing the card dead position, the tool bit stretches out and cuts the dead drill sleeve pipe of card, reaches and retrieves upper portion smoothly and bores sheathed tube purpose, avoids unnecessary extravagant, solves the above-mentioned problem that the background art exists.
The technical scheme of the utility model is that:
a cutting device in a drilling casing well comprises a pressing sleeve, a guide sleeve, a main shaft, a spring sleeve, a compression spring, a pin shaft, a tool bit, a main body and a tip, wherein the pressing sleeve and the spring sleeve are connected to form a tubular structure; the main body is connected with the front end of the tubular structure, the main body is of a cylindrical structure, a tool bit accommodating cavity is arranged in the main body, and the front end and the rear end of the main body are both open and are communicated with the tool bit accommodating cavity; the centre inserts the tool bit of main part through the front end opening of main part and holds the intracavity, and the rear end opening that the front end of main shaft passes through the main part enters into the tool bit of main part and holds the intracavity, and the tool bit setting holds the intracavity at the tool bit, and the tool bit rear end is articulated with the main shaft front end through the round pin axle, is equipped with the tool bit that holds the chamber with the tool bit on the lateral wall of main part and stretches out the mouth, and tool bit one side contacts with the centre, and the tool bit opposite side contacts with the inner chamber.
The inner part of the main shaft is provided with a strip-shaped drain hole I, the side walls of the front end and the rear end of the main shaft are respectively provided with a drain hole III and a pressure regulating hole, the drain hole III is communicated with the pressure regulating hole through the drain hole I, a hexagon bolt penetrates through a hexagon nut and then enters the drain hole I of the main shaft, and the side wall of the hexagon bolt is contacted with the pressure regulating hole; the front end of the tubular structure is provided with a drainage groove, and the drainage hole tee joint is communicated with the cutter head accommodating cavity of the main body through the drainage groove.
The side wall of the guide sleeve is provided with an annular in-place protection groove, and the side wall of the tubular structure is provided with a second drainage hole matched with the in-place protection groove.
An annular sealing groove is further formed in the side wall of the guide sleeve, an O-shaped ring is arranged in the annular sealing groove, and the guide sleeve and the spring sleeve are sealed through the O-shaped ring.
The guide sleeve is characterized by further comprising a round nut, a front gasket and a rear gasket, wherein the front gasket and the rear gasket are respectively arranged on two sides of the guide sleeve, the front gasket is fastened with the guide sleeve through the round nut arranged on the main shaft, and the rear gasket is arranged between the compression spring and the guide sleeve.
The front gasket and the rear gasket are both multiple.
The front end of the cutter head is provided with an arc-shaped chamfer.
The number of the tool bit extension openings is two.
The pressure regulating holes are 4 or 6 and are distributed on the side wall of the main shaft in a staggered mode, the centers of all the pressure regulating holes are not located on the same circumferential section of the main shaft, the flow area of the pressure regulating holes can be slightly adjusted by screwing the hexagon bolts, and pressure can be stably adjusted.
The utility model discloses during operation, in drilling mud enters into the tubular structure from the rear end opening part of tubular structure, drilling mud promotes uide bushing and main shaft forward movement (similar piston motion), it stretches out the mouth from the tool bit to drive the tool bit simultaneously and stretches out, rig drive cutting device is whole rotatory, for the tool bit provides power, the dead drill bushing of tool bit cutting card, after the cutting is accomplished, disappear when hydraulic, the uide bushing passes through compression spring's elasticity and moves backward, drive the main shaft and move backward simultaneously, the tool bit is retrieved the tool bit and is held the intracavity, take out cutting device at last, retrieve upper portion drill bushing.
The utility model discloses an actively the effect: the cutting-off operation can be carried out on the drill rod and the sleeve at any position in the drill hole, the drill rod and the sleeve which are stuck in the drill hole can be recovered to the greatest extent, and the cost is saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the present invention in use;
FIG. 3 is an enlarged view of the cross-sectional view of the interior of the pressing sleeve of the present invention;
in the figure: the tool bit comprises a pressing sleeve 1, a hexagon bolt 2, a hexagon nut 3, a round nut 4, a front gasket 5, a guide sleeve 6, a main shaft 7, an O-shaped ring 8, a spring sleeve 9, a compression spring 10, a pin shaft 11, a tool bit 12, a main body 13, a tip 14, a rear gasket 15, a tool bit accommodating cavity 16, a tool bit extending opening 17, a first steel pipe 18, a second steel pipe 19, a drilling hole 20, an in-place protection groove A, a pressure regulating hole B, a first drainage hole C, a second drainage hole D, a drainage groove E and a third drainage hole F.
Detailed Description
The invention is further described with reference to the following figures and examples:
a cutting device in a drilling casing well comprises a pressing sleeve 1, a guide sleeve 6, a main shaft 7, a spring sleeve 9, a compression spring 10, a pin shaft 11, a tool bit 12, a main body 13 and a tip 14, wherein the pressing sleeve 1 is connected with the spring sleeve 9 to form a tubular structure, the guide sleeve 6, the main shaft 7 and the compression spring 10 are arranged in the tubular structure, the guide sleeve 6 is fixed on the main shaft 7, the compression spring 10 is sleeved on the main shaft 7, the compression spring 10 is positioned between the guide sleeve 6 and the front end of the tubular structure, and the guide sleeve 6, the main shaft 7, the compression spring 10 and the tubular structure form a piston structure; the main body 13 is connected with the front end of the tubular structure, the main body 13 is of a cylindrical structure, a tool bit accommodating cavity 16 is arranged in the main body 13, and the front end and the rear end of the main body 13 are both open and are communicated with the tool bit accommodating cavity 16; the tip 14 is inserted into a tool bit accommodating cavity 16 of the main body 13 through the front end opening of the main body 13, the front end of the main shaft 7 enters the tool bit accommodating cavity 16 of the main body 13 through the rear end opening of the main body 13, the tool bit 12 is arranged in the tool bit accommodating cavity 16, the rear end of the tool bit 12 is hinged with the front end of the main shaft 7 through a pin shaft 11, a tool bit extending opening 17 communicated with the tool bit accommodating cavity is formed in the side wall of the main body 13, one side of the tool bit 12 is in contact with the tip 14, and the other side of the tool bit 12 is in contact with the inner cavity wall.
A strip-shaped drain hole I C is formed in the main shaft 7, drain holes III F and pressure regulating holes B are formed in the side walls of the front end and the rear end of the main shaft 7 respectively, the drain holes III F and the pressure regulating holes B are communicated through the drain holes I C, the hexagon bolt 2 penetrates through the hexagon nut 3 and then enters the drain hole I C of the main shaft 7, and the side wall of the hexagon bolt is in contact with the pressure regulating holes B; the front end of the tubular structure is provided with a drainage groove E, and the drainage hole III F is communicated with the cutter head accommodating cavity of the main body 13 through the drainage groove E.
An annular in-place protection groove A is formed in the side wall of the guide sleeve 6, and a drainage hole II D matched with the in-place protection groove A is formed in the side wall of the tubular structure.
An annular sealing groove is further formed in the side wall of the guide sleeve 6, an O-shaped ring 8 is arranged in the annular sealing groove, and the guide sleeve 6 and the spring sleeve 9 are sealed through the O-shaped ring 8.
Still contain round nut 4, preceding gasket 5 and back gasket 15, preceding gasket 5 sets up respectively in the both sides of uide bushing 6 with back gasket 15, and preceding gasket 5 fastens mutually with uide bushing 6 through the round nut 4 that sets up on main shaft 7, and back gasket 15 sets up between compression spring 10 and uide bushing 6.
The number of the front pad 5 and the rear pad 15 is at least one.
The front end of the cutter head 12 is provided with an arc-shaped chamfer.
The number of the tool bit extending openings 17 is two.
The using method comprises the following steps:
① the first steel pipe 18 is connected with the upper end of the pressing sleeve 1, the cutting device can descend in the second steel pipe 19 to be cut, when the cutting device reaches the position where the second steel pipe 19 needs to be cut, the descending is stopped;
② supplying water into the first steel pipe 18 by a mud pump, compressing the guide sleeve 6 to drive the compression spring 10 to compress, making the main shaft 7 enter the tool bit accommodating cavity 16, making the water flow enter the tool bit accommodating cavity 16 through the pressure regulating hole B, the drain hole C and the drain hole III F, and finally discharging the water into the second steel pipe 19 and the drill hole 20 through the tool bit extension port 17, when the second steel pipe 19 or the drill hole 20 starts to return water upwards, adjusting the water supply pressure of the mud pump to about 0.5MPa, and making the tool bit 12 extend out of the main body 13 from the tool bit extension port 17 and slightly contact with the inner wall of the second steel pipe 19;
③ slowly rotating the first steel pipe 18 on the ground by a drilling machine, driving the cutting device to slowly rotate, forming relative motion between the cutter head 12 and the second steel pipe 19, the cutter head 12 starting to cut the second steel pipe 19, at this time, the cutter head is not stably operated because of the beginning of cutting, and must slowly rotate;
④ when the second steel pipe 19 is cut off, the inner cavity of the tubular structure is communicated with the discharge hole two D through the in-place protection groove A on the side wall of the guide sleeve 6, the water flow in the tubular structure is discharged into the second steel pipe 19 through the in-place protection groove A and the discharge hole two D and returns to the ground through the inner cavity of the second steel pipe 19, at the moment, the water supply pressure of the slurry pump is reduced to the minimum, the slurry pump can be stopped, when the pressure in the drill hole 20 is stable, the first steel pipe 18 is used for lifting the cutting device, and then the second cut steel pipe 19 is taken out, thus completing the operation.
The number of the pressure regulating holes B is 4 or 6, the pressure regulating holes B are distributed on the side wall of the main shaft 7 in a staggered mode, the centers of all the pressure regulating holes B are not located on the same circumferential section of the main shaft 7, the flow area of the pressure regulating holes B can be slightly adjusted by screwing the hexagon bolts 2, and pressure can be stably adjusted.
In this embodiment, referring to fig. 1, the cutter head is hinged to the front end of the main shaft by a pin shaft and can move up and down along with the main shaft. When the main shaft moves downwards, the tip forces the cutter head to rotate around the pin shaft, so that the cutter point extends out of the main body, and the cutting of the drill sleeve is completed. When the main shaft upwards removed, the tool bit held the inner chamber wall in chamber and forces the tool bit to retrieve in the main part, made the tool bit hide in the tool bit of main part holds the intracavity, and is convenient the utility model discloses remove in the drill bushing lumen that needs cut open. Downward movement of the cutter head and main shaft is achieved by the drilling mud pushing the piston structure. When the guide sleeve 6 reaches the front end of the tubular structure, the in-place protection groove A is communicated with the drainage hole II D, drilling mud is drained out through the drainage hole II D along the in-place protection groove A, hydraulic force is reduced, the guide sleeve 6 and the main shaft 7 move backwards in a small range, so that the cutter head stops continuing to extend out, and the cutter head is protected. The upward movement of the cutter head and the main shaft is realized by the elastic force of a compression spring. The drilling mud pushes the guide sleeve to move and simultaneously compresses the compression spring, mechanical energy is stored, and when hydraulic force disappears, the compression spring pushes the guide sleeve to drive the main shaft and the cutter head to retract.
The main part 13 is a cylindrical structure with openings at the front end and the rear end, two cutter head accommodating cavities 16 communicated with each other are arranged in the main part along the circumferential direction, the cutter head accommodating cavities 16 are communicated with the openings at the front end and the rear end of the main part, the inner cavity wall of each cutter head accommodating cavity 16 connected with the opening at the rear end of the main part is obliquely arranged, and the cutter head 12 is contacted with the inner cavity wall obliquely arranged. The cutter head 12 and the main shaft 7 are connected into a whole by a pin shaft 11, so that the transmission of motion from the main shaft 7 to the cutter head is realized; the opening at the front end of the main body is a mounting hole which is used for assembling a tip 14, preventing the tool bit 12 and the main shaft 7 from moving linearly, and promoting the tool bit 12 to rotate around the pin shaft to realize the opening action of the tool bit 12; the rear end of the main body is sequentially connected with the spring sleeve 9 and the pressing sleeve 1 to form a main body structure of the cutting device in the drill casing well.
The spring sleeve 9 is internally provided with a guide sleeve 6 and a compression spring 10. An annular sealing groove and an in-place protection groove A are formed in the guide sleeve 6, and an O-shaped ring 8 is arranged on the annular sealing groove, so that sealing between the guide sleeve 6 and the spring sleeve 9 is realized. The front gaskets 5 and the rear gaskets 15 with different numbers are respectively arranged at the two ends of the guide sleeve 6, the number of the front gaskets 5 and the number of the rear gaskets 15 can be adjusted, and the mutual position relation between the in-place protection groove A and the action that the tool bit 12 stops extending out of the main body 13 can be adjusted. The guide sleeve 6, the front gasket 5 and the rear gasket 15 are clamped on the main shaft 7 through the round nut 4 and the compression spring 10, so that the guide sleeve, the front gasket and the rear gasket are combined into a whole.
7 rear ends of main shaft are equipped with hex bolts 2 and hex nuts 3, can lean out tension to the tool bit as required and adjust, adjust hex bolts 2, change pressure regulating hole B flow area size, make partial high pressure drilling mud pass through pressure regulating hole B, discharge orifice C and discharge orifice three F, discharge through tool bit holding cavity 16 along discharge orifice E and discharge, the flow size that adjustment drilling mud passes through cutting device, change drilling mud to the pressure of uide bushing 6, and then change the size that tool bit 12 feeds the cutting force, guarantee cutting construction safety and tool bit life.
The application method of the embodiment comprises the following steps:
1. connect steel pipe 18 in pressing cover 1 upper end, make the utility model discloses cutting device can descend in two 19 steel pipes that need the cutting, when cutting device reachs two 19 steel pipes that need the position of cutting off, stops to descend.
2. And (3) supplying water into the first steel pipe 18 by using a slurry pump, and adjusting the water supply pressure of the slurry pump to be about 0.5MPa when the second steel pipe 19 or the part of the drill hole 20 on the ground begins to return water. At this time, the cutter head 12 extends out of the main body 13 and slightly contacts with the inner wall of the second steel pipe 19.
3. And slowly rotating the first steel pipe 18 on the ground by using a drilling machine to drive the cutting device to slowly rotate, forming relative motion between the cutter head 12 and the second steel pipe 19, and starting to cut the second steel pipe 19 by the cutter head 12, wherein the cutter head cannot stably run due to the fact that the cutter head just starts to cut and must slowly rotate. When the cutter head 12 cuts a part of the inner wall of the second steel pipe 19 and the cutting device operates stably, the water supply pressure of the slurry pump is adjusted to 1-2MPa, the rotating speed of the first steel pipe is increased, and rapid cutting is carried out.
4. Considering that the cutting device is likely not to be located at the center of the second steel pipe 19 when the cutter head 12 cuts, the maximum opening size of the cutter head 12 is designed to be 10mm larger than the outer diameter of the second steel pipe 19.
5. The number of the pressure regulating holes B is 4 or 6, the centers of all the pressure regulating holes B are not positioned on the same circumferential section, and the flow area of the pressure regulating holes B can be slightly regulated when the hexagonal bolt 2 is screwed to regulate the pressure, so that the pressure is stably regulated.
6. When the second steel pipe 19 is cut off, the in-place protection groove A on the side wall of the guide sleeve 6 is communicated with the spring cavity of the spring sleeve 9, and water flows out through the drainage hole II D and returns to the ground through the inner cavity of the second steel pipe 19. At the moment, the water supply pressure of the slurry pump is reduced to the minimum, the pump can be stopped, and the cutting device is lifted out by the first steel pipe 18 after the pressure in the drilled hole 20 is stabilized.
Claims (8)
1. The utility model provides a cutting device in drilling casing well which characterized in that: the novel piston rod pressing device comprises a pressing sleeve (1), a guide sleeve (6), a main shaft (7), a spring sleeve (9), a compression spring (10), a pin shaft (11), a tool bit (12), a main body (13) and a tip (14), wherein the pressing sleeve (1) is connected with the spring sleeve (9) to form a tubular structure, the guide sleeve (6), the main shaft (7) and the compression spring (10) are arranged in the tubular structure, the guide sleeve (6) is fixed on the main shaft (7), the compression spring (10) is sleeved on the main shaft (7), the compression spring (10) is located between the guide sleeve (6) and the front end of the tubular structure, and the guide sleeve (6), the main shaft (7), the compression spring (10) and the tubular structure form a piston structure; the main body (13) is connected with the front end of the tubular structure, the main body (13) is of a cylindrical structure, a tool bit accommodating cavity (16) is formed in the main body, and the front end and the rear end of the main body (13) are both open and communicated with the tool bit accommodating cavity (16); the tip (14) is inserted into a tool bit accommodating cavity (16) of the main body (13) through the front end opening of the main body (13), the front end of the main shaft (7) enters into the tool bit accommodating cavity (16) of the main body (13) through the rear end opening of the main body (13), the tool bit (12) is arranged in the tool bit accommodating cavity (16), the rear end of the tool bit (12) is hinged with the front end of the main shaft (7) through a pin shaft (11), a tool bit extending opening (17) communicated with the tool bit accommodating cavity is formed in the side wall of the main body (13), one side of the tool bit (12) is contacted with the tip (14), and the other side of the tool bit (12) is contacted with the inner cavity wall of the tool bit accommodating cavity (16.
2. A drill casing downhole severing device as claimed in claim 1 wherein: a strip-shaped drain hole I (C) is formed in the main shaft (7), drain holes III (F) and pressure regulating holes B are formed in the side walls of the front end and the rear end of the main shaft (7) respectively, the drain holes III (F) and the pressure regulating holes (B) are communicated through the drain holes I (C), a hexagonal bolt (2) penetrates through a hexagonal nut (3) and then enters the drain hole I (C) of the main shaft (7), and the side wall of the hexagonal bolt is in contact with the pressure regulating holes (B); the front end of the tubular structure is provided with a drainage groove (E), and the drainage hole III (F) is communicated with the cutter head accommodating cavity of the main body (13) through the drainage groove (E).
3. A drill casing downhole severing device as claimed in claim 1 or 2, wherein: the lateral wall of the guide sleeve (6) is provided with an annular in-place protection groove (A), and the lateral wall of the tubular structure is provided with a drainage hole II (D) matched with the in-place protection groove (A).
4. A drill casing downhole shut-off device as defined in claim 3, wherein: an annular groove is further formed in the side wall of the guide sleeve (6), an O-shaped ring (8) is arranged in the annular groove, and the guide sleeve (6) and the spring sleeve (9) are sealed through the O-shaped ring (8).
5. A drill casing downhole severing device as claimed in claim 1 or 2, wherein: still contain round nut (4), preceding gasket (5) and back gasket (15) set up respectively in the both sides of uide bushing (6), and preceding gasket (5) are fastened mutually with uide bushing (6) through round nut (4) that sets up on main shaft (7), and back gasket (15) set up between compression spring (10) and uide bushing (6).
6. A drill casing downhole severing device according to claim 5 wherein: the number of the front gasket (5) and the rear gasket (15) is at least one.
7. A drill casing downhole severing device as claimed in claim 1 or 2, wherein: the front end of the cutter head (12) is provided with an arc-shaped chamfer.
8. A drill casing downhole severing device as claimed in claim 2 wherein: the four or six pressure regulating holes (B) are distributed on the side wall of the main shaft (7) in a staggered mode, and the centers of all the pressure regulating holes (B) are not located on the same circumferential section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921431003.5U CN210918950U (en) | 2019-08-30 | 2019-08-30 | Cutting device in drilling casing well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921431003.5U CN210918950U (en) | 2019-08-30 | 2019-08-30 | Cutting device in drilling casing well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210918950U true CN210918950U (en) | 2020-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921431003.5U Active CN210918950U (en) | 2019-08-30 | 2019-08-30 | Cutting device in drilling casing well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210918950U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359871A (en) * | 2019-08-30 | 2019-10-22 | 金石钻探(唐山)股份有限公司 | A kind of drill bushing pipe well internal cutting off device and its application method |
-
2019
- 2019-08-30 CN CN201921431003.5U patent/CN210918950U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359871A (en) * | 2019-08-30 | 2019-10-22 | 金石钻探(唐山)股份有限公司 | A kind of drill bushing pipe well internal cutting off device and its application method |
| CN110359871B (en) * | 2019-08-30 | 2024-03-12 | 金石钻探(唐山)股份有限公司 | Cutting device in drill sleeve well and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A cut-off device in casing drilling well Effective date of registration: 20210128 Granted publication date: 20200703 Pledgee: China Construction Bank Co.,Ltd. Tangshan Jidong Oilfield sub branch Pledgor: Golden stone drilling (Tangshan) Limited by Share Ltd. Registration number: Y2021990000124 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220609 Granted publication date: 20200703 Pledgee: China Construction Bank Co.,Ltd. Tangshan Jidong Oilfield sub branch Pledgor: Golden stone drilling (Tangshan) Limited by Share Ltd. Registration number: Y2021990000124 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A cut-off device for casing drilling Effective date of registration: 20220609 Granted publication date: 20200703 Pledgee: China Construction Bank Co.,Ltd. Tangshan Jidong Oilfield sub branch Pledgor: Golden stone drilling (Tangshan) Limited by Share Ltd. Registration number: Y2022990000313 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230721 Granted publication date: 20200703 Pledgee: China Construction Bank Co.,Ltd. Tangshan Jidong Oilfield sub branch Pledgor: Golden stone drilling (Tangshan) Limited by Share Ltd. Registration number: Y2022990000313 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A downhole cutting device for drilling casing Effective date of registration: 20230807 Granted publication date: 20200703 Pledgee: China Construction Bank Co.,Ltd. Tangshan Jidong Oilfield sub branch Pledgor: Golden stone drilling (Tangshan) Limited by Share Ltd. Registration number: Y2023110000322 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |