CN210289637U - A high anti-collision PDC drill bit - Google Patents
A high anti-collision PDC drill bit Download PDFInfo
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- CN210289637U CN210289637U CN201921392401.0U CN201921392401U CN210289637U CN 210289637 U CN210289637 U CN 210289637U CN 201921392401 U CN201921392401 U CN 201921392401U CN 210289637 U CN210289637 U CN 210289637U
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Abstract
本实用新型公开了一种高防碰撞PDC钻头,涉及石油天然气钻探工程、矿山开采、地质钻探、建筑工程、隧道工程、盾构及非开挖等技术设备领域，包括钻头主体、沿周向设置的多个刀翼、安装在各个刀翼上的前排切削齿；各所述刀翼均连接有保径块，相邻两个所述保径块之间均连接有连接件，连接件的外表面低于保径块的外表面，且连接件的内壁与钻头主体之间具有排屑通道。本实用新型不仅使钻头结构更加稳固，且有效使钻头在钻进过程中，钻头的转动更加平稳，减小钻头的振动，从而减小钻头与井壁之间的撞击，使刀翼上的前排切削齿得到更好的保护，避免前排切削齿因受到冲击而先期损坏，使前排切削齿的使用寿命大大提高，最终的钻头的使用寿命大大提高。
The utility model discloses a high anti-collision PDC drill bit, which relates to the technical equipment fields of oil and natural gas drilling engineering, mining, geological drilling, construction engineering, tunnel engineering, shield tunneling, trenchless and the like. A plurality of blade wings, the front row of cutting teeth installed on each blade blade; each of the blade wings is connected with a gauge block, and a connector is connected between two adjacent gauge blocks. The outer surface is lower than the outer surface of the gauge block, and there is a chip removal channel between the inner wall of the connecting piece and the main body of the drill bit. The utility model not only makes the structure of the drill bit more stable, but also effectively makes the rotation of the drill bit more stable during the drilling process, reduces the vibration of the drill bit, thereby reduces the impact between the drill bit and the well wall, and makes the front of the blade on the blade more stable. The cutting teeth of the row are better protected to avoid the early damage of the cutting teeth of the front row due to impact, so that the service life of the cutting teeth of the front row is greatly improved, and the service life of the final drill is greatly improved.
Description
Technical Field
The utility model relates to a technical equipment fields such as oil and gas probing engineering, mining, geological drilling, building engineering, tunnel engineering, shield structure and non-excavation particularly, relate to a high anticollision PDC drill bit.
Background
The drill bit is a tool which is in direct contact with the rock during drilling and breaks the rock by cutting, punching, etc. The bit that extensively uses among the modern drilling engineering mainly has roller bit, PDC drill bit (Polycrystalline diamond direct impact Bits Polycrystalline diamond compact bit), because of the PDC drill bit compare with roller bit have that the rate of mechanical drilling is fast, borehole operation is longe-lived, the risk is low, and the fashioned well bore shape section of PDC drill bit is oval, consequently, the use of PDC drill bit in drilling process is more extensive.
However, conventional PDC drill bit is when creeping into, because PDC drill bit cutting teeth make PDC drill bit and drilling string not only can bear certain torsional force when cutting the stratum, and the PDC drill bit also can produce a frictional force when contacting with the wall of a well in the process of creeping into, and when the torsional force that frictional force and drilling string bore reaches certain numerical value, then can lead to the drilling string torsional vibration, thereby arouse the PDC drill bit to take place torsional vibration, not only make the PDC drill bit take place the card and slide the phenomenon, it is big-and-small when leading to PDC drill bit rotational speed, and the impact load that can make the cutting teeth on the PDC drill bit bear increases, the impact damage of acceleration cutting teeth, cause the diamond layer on the PDC drill bit to drop even, make the fatigue destruction of PDC drill bit, greatly reduced PDC drill bit's life.
Disclosure of Invention
An object of the utility model is to provide a high anticollision PDC drill bit can effectively make the PDC drill bit more steady at (drilling) in-process, reduces the PDC drill bit and rotates the vibration of in-process, reduces the wearing and tearing of PDC drill bit, makes the life of PDC drill bit improve greatly.
For realizing the purpose of the utility model, the technical proposal adopted is that: a high anti-collision PDC drill bit comprises a drill bit main body, a plurality of blades arranged along the circumferential direction, and front rows of cutting teeth arranged on the blades; each the wing all is connected with the gauge block, adjacent two all be connected with the connecting piece between the gauge block, the surface of connecting piece is less than the surface of gauge block, and has the chip removal passageway between the inner wall of connecting piece and the drill bit main part.
Furthermore, each connecting piece is provided with a supporting tooth on the outer surface, the supporting teeth on the connecting pieces are on the same circumference, and the circumference diameter formed by the supporting teeth and the maximum diameter of the drill bit are on the same circumference.
Furthermore, each connecting piece is provided with a plurality of supporting teeth, and the plurality of supporting teeth are arranged at intervals along the profile direction of the connecting piece.
Furthermore, the supporting teeth are polycrystalline diamond compacts, natural diamonds, diamond-impregnated cutting teeth or hard alloy teeth.
Furthermore, the shape of the supporting tooth is one or more of a cylinder, a cone, a bulb or an arc.
Furthermore, the connecting piece is arc-shaped, and the central line of the connecting piece is positioned at the connecting part of the gauge protecting block and the blade.
Furthermore, the lower edge of the connecting piece is also fixedly provided with a lateral cutting tooth.
Furthermore, each lateral cutting tooth on the connecting piece is a plurality of, and a plurality of lateral cutting teeth are arranged at intervals along the contour line direction of the connecting piece.
Furthermore, one side of the gauge block is also provided with front-end gauge teeth, and the outer surface of the gauge block is also provided with rear-end gauge teeth.
Further, one end of the connecting piece, which is close to the front-end gauge teeth, is bent inwards.
Furthermore, the front row of cutting teeth on each blade are multiple, and the multiple front rows of cutting teeth are arranged at intervals along the direction of the rotary contour line of the blade.
Furthermore, a plurality of water holes are formed in the drill bit main body.
The utility model has the advantages that,
through set up the connecting piece between two adjacent gauge blocks, not only make the drill bit structure more firm, and effectively make the drill bit creep into the in-process, the rotation of drill bit is more steady, reduce the vibration of drill bit, thereby reduce the striking between drill bit and the wall of a well, the antecedent row cutting teeth that makes on the wing obtain better protection, avoid the antecedent row cutting teeth to damage because of receiving the impact earlier, make the life of antecedent row cutting teeth improve greatly, the life of final drill bit improves greatly.
Drawings
Fig. 1 is a structural diagram of a high anti-collision PDC drill bit provided by the present invention.
Reference numbers and corresponding part names in the drawings:
1. the drill bit comprises a drill bit body, 2, blades, 3, gauge protection blocks, 4, a connecting piece, 5, a chip removal channel, 6, supporting teeth, 7, front-row cutting teeth, 8, lateral cutting teeth, 9, front-end gauge protection teeth, 10, rear-end gauge protection teeth, 11 and water holes.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
Fig. 1 shows the utility model provides a pair of high anticollision PDC drill bit, including drill bit main part 1, along a plurality of blades 2 of circumference setting, install the leading bank of cutting teeth 7 on each blade 2, each blade 2 all is connected with gauge block 3, adjacent two all connect between gauge block 3 and be provided with connecting piece 4, the surface of connecting piece 4 is less than the surface of gauge block 3, and has chip removal passageway 5 between the inner wall of connecting piece 4 and the drill bit main part 1.
The cutting blades 2 are positioned at the crown of the drill bit, the plurality of cutting blades 2 are arranged at intervals along the circumferential direction of the drill bit main body 1, each cutting blade 2 is fixedly provided with a front row of cutting teeth 7, the front row of cutting teeth 7 are made of hard alloy, polycrystalline diamond composite sheets, polycrystalline diamond composites, polycrystalline diamond impregnated inserts, artificial diamond impregnated inserts, natural diamond impregnated inserts or ceramics, or made of composite materials containing hard alloy, diamond and cubic boron nitride, and the front row of cutting teeth 7 are fixedly arranged on the cutting blades 2 in a welding or sintering mode and the like; the gauge blocks 3 extend along the blades 2, namely, each blade 2 corresponds to one gauge block 3, and the arrangement mode of the gauge blocks 3 is consistent with that of the blades 2; the both ends of connecting piece 4 are fixed respectively on the relative lateral wall of two adjacent gauge blocks 3, and the both ends of connecting piece 4 can weld fixed also whole machine-shaping, through connecting piece 4 between two adjacent gauge blocks 3, can not only strengthen wing 2's intensity, compensate simultaneously the difference in height between chip groove and the wing 2 between two adjacent wing 2, make the drill bit in the rotation process, the wall of a well can be hugged closely to the supporting tooth 6 on the connecting piece 4, let wing 2's rotation become pure roll, effectively avoid next wing 2 striking the wall of a well, make front row cutting teeth 7 on wing 2 can be effectively protected, prevent that front row cutting teeth 7 on wing 2 from receiving the impact and damaging in advance.
The connecting piece 4 and the gauge block 3 can be fixed through integral processing and forming, welding, matrix sintering and the like, so that the connecting piece 4 is more stably installed, the connecting part of the connecting piece 4 and the gauge block 3 is prevented from being broken or cracked in the drilling process, and the service life of the drill bit is longer. The maximum distance between the outer surface of the connecting piece 4 and the center of the drill bit main body 1 is smaller than the maximum distance between the outer surface of the gauge block 3 and the center of the drill bit main body 1, so that the situation that the drill bit is blocked by the connecting piece 4 in the drilling process is effectively prevented, the abrasion of the connecting piece 4 and the well wall in the drilling process can be reduced, and the service life of the drill bit is ensured.
Because at the in-process of creeping into, the cutting of drill bit can produce a large amount of detritus, through set up chip removal passageway 5 between connecting piece 4 and drill bit main part 1, make the drill bit can get into the annular space through chip removal passageway 5 at the detritus that creeps into in-process production to finally return to ground, avoid the repeated cutting of detritus, make the efficiency of creeping into improve greatly.
Each connecting piece 4 is provided with a supporting tooth 6 on the outer surface, the supporting teeth 6 on the connecting pieces 4 are on the same circumference, and the circumference diameter formed by the supporting teeth 6 and the maximum diameter of the drill bit are on the same circumference. The extending direction of the supporting teeth 6 is consistent with the radius direction of the drill bit main body 1, and the supporting teeth 6 are fixedly arranged on the outer surface of the connecting piece 4 in a welding, press-fitting and other modes, so that the supporting teeth 6 are more stably arranged; support tooth 6 on a plurality of connecting pieces 4 carries out the circumference around the central axis of drill bit main part 1 and arranges, make a plurality of support tooth 6 all on same circumference, the circumference maximum diameter that a plurality of support tooth 6 formed equals with the maximum diameter of drill bit, make the drill bit creep into the in-process, support tooth 6 can hug closely the wall of a well, reduce the radial swing of drill bit, and simultaneously, support tooth 6 through setting up, make the drill bit rotate the in-process, mud can not only wash the surface of connecting piece 4, and mud can be to the better cooling of connecting piece 4, thereby realize the protection to connecting piece 4, the service life of connecting piece 4 has been improved.
Every supporting tooth 6 on the connecting piece 4 is a plurality of, a plurality of supporting tooth 6 set up along the profile direction interval of connecting piece 4, and a plurality of supporting tooth 6 on every connecting piece 4 can even interval arrange, a plurality of supporting tooth 6 on every connecting piece 4 can interval arrange at will, and a plurality of supporting tooth 6's on every connecting piece 4 mode of arranging can set up according to actual conditions, for example, supporting tooth 6 on every connecting piece 4 still can set into the multirow, through set up a plurality of or multirow supporting tooth 6 on every connecting piece 4, make the drill bit at the in-process of creeping into, the supporting effect of supporting tooth 6 is better, reduce the radial swing of drill bit, thereby improve the life-span of drill bit.
The supporting teeth 6 are polycrystalline diamond compacts or natural diamonds or diamond-impregnated cutting teeth or hard alloy teeth, so that the hardness of the supporting teeth 6 is guaranteed, and the service life of the supporting teeth 6 is guaranteed. The shape of the supporting tooth 6 is one or more of a cylinder, a cone, a bulb or an arc, the specific shape of the supporting tooth 6 can be set according to the drilling geology or the drilling condition, and the arc supporting tooth 6 is preferentially adopted here.
The connecting piece 4 is arc-shaped, and the central line of the connecting piece 4 is positioned at the joint of the gauge block 3 and the blade 2. The circle center of the connecting piece 4 and the central axis of the drill bit main body 1 are on the same straight line, the width of the connecting piece 4 is smaller than the length of the gauge block 3, the stability of the drill bit is ensured, the chip removal effect of the drill bit is ensured, and the use effect of the drill bit in the drilling process is better; one part of the end part of the connecting piece 4 is fixed with the gauge block 3, and the other part of the end part of the connecting piece 4 is fixed with the blade 2, so that the connecting piece 4, the gauge block 3 and the blade 2 are jointly fixed, the stabilizing effect of the connecting piece 4, the gauge block 3 and the blade 2 is greatly improved, the fixed installation of the connecting piece 4 is realized, and the strength of the blade 2 is enhanced; meanwhile, the radial swing of the drill bit can be reduced in the drilling process, the front row of cutting teeth 7 on the blade 2 are prevented from being damaged in advance due to impact, the service life of the front row of cutting teeth 7 is prolonged, and the service life of the drill bit is prolonged.
The lower limb of connecting piece 4 still fixed mounting has side direction cutting teeth 8, the extending direction of side direction cutting teeth 8 is unanimous with 4 width direction of connecting piece, and the one end that connecting piece 4 was kept away from to side direction cutting teeth 8 is the extending end of side direction cutting teeth 8, and the extending end of side direction cutting teeth 8 extends to the direction of creeping into, makes the drill bit at the drilling in-process, and side direction cutting teeth 8 can not only effectively carry out the secondary cutting to the shaft bottom detritus, and makes the detritus that produces among the cutting process discharge the annular space through chip removal passageway 5 smoothly. In addition, the lateral cutting teeth 8 can be matched with the front row cutting teeth 7 to scrape the well wall, so that the size of the well is ensured, and the mechanical drilling speed is increased; simultaneously, because the detritus that produces at the drilling in-process is more, and the rotational speed of drill bit is very fast, the detritus that produces promptly is high-speed operation, through setting up side direction cutting teeth 8, side direction cutting teeth 8 can effectively carry out breakage and buffering to mud, make the detritus reduce greatly to the impact of connecting piece 4, not only make the protection effect of connecting piece 4 better, and make the stability and the guarantor diameter performance of drill bit better, reduce the wearing and tearing of mud to connecting piece 4, make the life of connecting piece 4 longer, make the life of drill bit longer.
Every lateral direction cutting teeth 8 on the connecting piece 4 are a plurality of, and a plurality of lateral direction cutting teeth 8 are arranged along the contour line direction interval of connecting piece 4, a plurality of lateral direction cutting teeth 8 on every connecting piece 4 can be evenly arranged at intervals, a plurality of lateral direction cutting teeth 8 on every connecting piece 4 also can be arranged at random intervals, and the mode of arranging of a plurality of supporting teeth 6 on every connecting piece 4 can set up according to actual conditions, make the drill bit at the drilling in-process, lateral direction cutting teeth 8 can effectively carry out the secondary cutting to the detritus, and repair the wall of a well, improve the rate of penetration of drill bit.
One side of gauge block 3 still is provided with front end gauge teeth 9, and still is provided with rear end gauge teeth 10 on gauge block 3's the surface. The front-end gauge teeth 9 are multiple, and the front-end gauge teeth 9 are uniformly arranged at intervals along the axial direction of the gauge block 3; the rear-end gauge teeth 10 are multiple, and the rear-end gauge teeth 10 cover the outer surfaces of the gauge teeth, so that effective gauge protection of a borehole is ensured, and the stability, guidance and borehole quality of the drill bit are improved.
The front-end gauge teeth 9 and the rear-end gauge teeth 10 are welded or sintered on the gauge blocks 3, the rear-end gauge teeth 10 are flat-head teeth, ball-head teeth or arc-shaped teeth, the rear-end gauge teeth 10 are made of hard alloy, powder metallurgy, polycrystalline diamond composite sheets, polycrystalline diamond composites, polycrystalline diamond impregnated inserts, artificial diamond impregnated inserts, natural diamond impregnated inserts or ceramics, or composite materials containing hard alloy, diamond and cubic boron nitride, in order to improve the hardness and the wear resistance of the composite materials, polycrystalline diamond, artificial diamond, natural diamond or cubic boron nitride materials are arranged on the exposed surfaces of the rear-end gauge teeth 10, and wear-resistant hard alloy materials are welded on the surfaces of the gauge blocks 3 or wear-resistant materials are sintered on the surfaces of the gauge blocks.
One end of the connecting piece 4 close to the front-end gauge teeth 9 is bent inwards, so that the end part of the connecting piece 4 can effectively avoid the front-end gauge teeth 9 and the adjacent front-row cutting teeth 7, rock debris cut by the front-row cutting teeth 7 and the front-end gauge teeth 9 in the drilling process can smoothly enter an annular space through a slope surface on the connecting piece 4, the cutter wings 2 and a guide groove formed by the gauge blocks, and the front-row cutting teeth 7 and the front-end gauge teeth 9 can be effectively cooled.
Every leading row cutting teeth 7 on the wing 2 are a plurality of, and a plurality of leading row cutting teeth 7 set up along the even interval of the gyration profile line direction of wing 2, through leading row cutting teeth 7 and the cooperation of front end gauge protection tooth 9, make the effect of creeping into of drill bit improve greatly. Still seted up a plurality of water holes 11 on the drill bit main part 1, can not only carry the cuttings of leading cutting teeth 7 through mud and discharge from chip removal passageway 5 to the annular space, avoid the secondary cutting of leading cutting teeth 7 to the cuttings, simultaneously, the better cooling leading cutting teeth 7 of ability, the life-span of extension leading cutting teeth 7.
When the drill bit body 1 is used, the drill bit body 1 rotates along with the drill tool combination, a water hole 11 formed in the drill bit body 1 starts to spray slurry, a front row of cutting teeth 7 arranged on the blade 2, a front end gauge protection tooth 9 and a rear end gauge protection tooth 10 arranged on the gauge protection block 3 synchronously rotate along with the drill bit body 1, the front row of cutting teeth 7 cut a stratum to form a borehole, the front end gauge protection tooth 9 and the rear end gauge protection tooth 10 guarantee the size of the borehole, the drill bit body 1 rotates, meanwhile, the connecting piece 4, a supporting tooth 6 arranged on the connecting piece 4 and a lateral cutting tooth 8 synchronously rotate along with the drill bit body 1, the supporting tooth 6 and the lateral cutting tooth 8 are matched with the front row of cutting teeth 7, the front end gauge protection tooth 9 and the rear end gauge protection tooth 10 to finish a drilling task, and rock debris generated in the drilling process is discharged into the air through the debris discharge channel 5 and finally returns to the ground.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high anti-collision PDC drill bit comprises a drill bit main body (1), a plurality of blades (2) arranged along the circumferential direction, and front rows of cutting teeth (7) arranged on the blades (2); each wing of a knife (2) all is connected with guarantor footpath piece (3), its characterized in that, adjacent two all be connected with connecting piece (4) between guarantor footpath piece (3), the surface of connecting piece (4) is less than the surface of guarantor footpath piece (3), and has chip removal passageway (5) between the inner wall of connecting piece (4) and drill bit main part (1).
2. The PDC drill bit with high anti-collision performance as claimed in claim 1, wherein the supporting teeth (6) are mounted on the outer surface of each connecting piece (4), the supporting teeth (6) on a plurality of connecting pieces (4) are on the same circumference, and the circumferential diameter formed by the supporting teeth (6) is on the same circumference as the maximum diameter of the drill bit.
3. The PDC drill bit with high anti-collision performance as claimed in claim 2, wherein the number of the support teeth (6) on each connecting piece (4) is multiple, and the multiple support teeth (6) are arranged at intervals along the profile direction of the connecting piece (4).
4. A high anti-collision PDC drill bit according to claim 2 or 3, wherein the support teeth (6) are polycrystalline diamond compacts or natural diamonds or diamond-impregnated cutting teeth or cemented carbide teeth.
5. A high anti-collision PDC drill bit according to claim 2 or 3, wherein the shape of the support teeth (6) is one or more of a cylinder, a cone, a ball head or a circular arc.
6. The PDC drill bit with high anti-collision performance as claimed in claim 1, wherein the connecting piece (4) is arc-shaped, and a central line of the connecting piece (4) is located at a joint of the gauge block (3) and the cutter blade (2).
7. A high collision avoidance PDC drill bit according to claim 1 or 2 or 3 or 6, characterized in that the lower edge of the connecting piece (4) is also fixedly mounted with lateral cutting teeth (8).
8. The PDC drill bit with high anti-collision performance according to claim 7, wherein the number of the lateral cutting teeth (8) on each connecting piece (4) is multiple, and the multiple lateral cutting teeth (8) are arranged at intervals along the contour line direction of each connecting piece (4).
9. The PDC drill bit with high anti-collision performance according to claim 1, wherein one side of the gauge block (3) is further provided with front-end gauge teeth (9), and the outer surface of the gauge block (3) is further provided with rear-end gauge teeth (10).
10. A high collision avoidance PDC drill bit according to claim 9, characterized in that the end of the connecting piece (4) near the front gauge teeth (9) is bent inwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921392401.0U CN210289637U (en) | 2019-08-26 | 2019-08-26 | A high anti-collision PDC drill bit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921392401.0U CN210289637U (en) | 2019-08-26 | 2019-08-26 | A high anti-collision PDC drill bit |
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| Publication Number | Publication Date |
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| CN210289637U true CN210289637U (en) | 2020-04-10 |
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| CN201921392401.0U Active CN210289637U (en) | 2019-08-26 | 2019-08-26 | A high anti-collision PDC drill bit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202417A (en) * | 2021-05-06 | 2021-08-03 | 中国石油大学(北京) | PDC drill bit |
| CN113323592A (en) * | 2021-08-04 | 2021-08-31 | 四川川庆石油钻采科技有限公司 | PDC drill bit capable of realizing casing drilling and design method thereof |
| CN113669090A (en) * | 2021-08-23 | 2021-11-19 | 中建八局发展建设有限公司 | Anchor rod construction process |
-
2019
- 2019-08-26 CN CN201921392401.0U patent/CN210289637U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202417A (en) * | 2021-05-06 | 2021-08-03 | 中国石油大学(北京) | PDC drill bit |
| CN113323592A (en) * | 2021-08-04 | 2021-08-31 | 四川川庆石油钻采科技有限公司 | PDC drill bit capable of realizing casing drilling and design method thereof |
| CN113323592B (en) * | 2021-08-04 | 2021-10-08 | 四川川庆石油钻采科技有限公司 | PDC drill bit capable of realizing casing drilling and design method thereof |
| CN113669090A (en) * | 2021-08-23 | 2021-11-19 | 中建八局发展建设有限公司 | Anchor rod construction process |
| CN113669090B (en) * | 2021-08-23 | 2023-05-02 | 中建八局发展建设有限公司 | Anchor rod construction process |
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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 | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A high anti-collision PDC drill bit Effective date of registration: 20230427 Granted publication date: 20200410 Pledgee: Shanghai Pudong Development Bank Co.,Ltd. Chengdu Branch Pledgor: Sichuan Deep & Fast Oil Drilling Tools Co.,Ltd. Registration number: Y2023510000112 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20200410 Pledgee: Shanghai Pudong Development Bank Co.,Ltd. Chengdu Branch Pledgor: Sichuan Deep & Fast Oil Drilling Tools Co.,Ltd. Registration number: Y2023510000112 |
|
| PE01 | Entry into force 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 high anti-collision PDC drill bit Granted publication date: 20200410 Pledgee: Shanghai Pudong Development Bank Co.,Ltd. Chengdu Branch Pledgor: Sichuan Deep & Fast Oil Drilling Tools Co.,Ltd. Registration number: Y2025980024101 |