CN203308383U - Device for amending well wall and improving drill bit gauge protection effect through action of rolling - Google Patents
Device for amending well wall and improving drill bit gauge protection effect through action of rolling Download PDFInfo
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- CN203308383U CN203308383U CN2013201837067U CN201320183706U CN203308383U CN 203308383 U CN203308383 U CN 203308383U CN 2013201837067 U CN2013201837067 U CN 2013201837067U CN 201320183706 U CN201320183706 U CN 201320183706U CN 203308383 U CN203308383 U CN 203308383U
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- bearing pin
- drill bit
- cylinder
- roller seat
- bit
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Abstract
The utility model discloses a device for amending the well wall and improving the drill bit gauge protection effect through the action of rolling. The device comprises a roller base (2) and a roller (4), wherein the roller base (2) is installed on the gauge protection cutting surface of a drill bit (12) through a bolt (1), and the roller (4) is installed on the roller base (2) in a rotation mode through a hinge pin (3). The hinge pin (3) is sleeved with the roller (4), and the two ends of the hinge pin (3) are installed on the roller base (2). The device has the advantages that the well wall is amended through the rolling action, the friction between the roller and the well wall is reduced, the effective abrasion size is increased, and the gauge protection effect is enhanced; the movement, relative to the well wall, of a gauge protection unit can be a rolling mode or a rolling and sliding mode, a well opening is expanded, the well wall is smoothed, and the well opening quality is improved; reaction torque in the process of drilling is reduced, and the stability of the drill bit is enhanced; the track of the well opening is regular, and in a highly-deviated well and a horizontal well, the reaction torque of the drill bit can be reduced, and the probability of convolution of the drill bit is reduced; the service life of the drill bit is prolonged, and the rate of penetration is improved.
Description
Technical field
The utility model relates to the oil and gas well drilling equipment technical field, particularly utilizes the rolling action correction borehole wall to strengthen the device of bit gauge protection effect.
Background technology
Drill bit, in drilling process, directly contacts with rock, by effect fractured rocks such as cutting, punching presses.Bore abrasive layer such as quartzite, hard dolomite, flint etc., can accelerate the bit cutting odontotripsis, particularly efflux cutting teeth.Along with the outer rows of teeth diameter reduces, the diameter of drill bit is reduced, borehole diameter also reduces, and well is dwindled and is caused again the lower difficulty of boring, and, due to a large amount of frictional heats and larger moment of torsion, can accelerate the damage of drill bit.
Existing drill bit with step gauge structure mainly is comprised of steel body, PDC cutting teeth, gauge teeth and nozzle, adopt the step gauge structure, avoided the gauge position of drilling bit steel body to be easy to the defect contacted with rock of borehole, also reduce simultaneously the gross area that drill bit contacts with rock, thereby improved the average rate of penetration of drill bit.
Along with the increase of drilling depth, the strata condition complexity, hardness is high, interlayer is many, abrasiveness is strong, also more and more higher to the gauge requirement of drill bit.From the research application of existing gauge, can obtain, gauge has considerable influence to drill bit rate of penetration and life-span, and especially impact is larger in directional well and horizontal well application.
One, the meaning of gauge.
After the bit diameter wearing and tearing, hole diameter is dwindled, cause hole quality not high, affect trip-out safety, well depth is darker, and well is dwindled the safe impact that pulls out of hole larger.Simultaneously, the green bit of replacing can't descend to shaft bottom, and green bit is gone into the well and can be caused reaming, and after reaming, bit diameter can wear and tear again.So be concatenated to form vicious circle, easily cause drill bit to damage in advance.In hard formation and abrasive layer, this problem is particularly outstanding.
Gauge has considerable influence to drill bit rate of penetration and life-span, and traditional gauge method for designing is to adopt trial and error procedure or approximatioss repeatedly, and design accuracy and accuracy are poor, study new and effective radial-protecting method significant to drilling well.
Two, existing gauge structure.
For preventing causing bit diameter to dwindle due to the wearing and tearing of formation rock, passive gauge technology is in the outside of drill bit, to arrange the gauge pad of some, wear-resisting, the shock proof material of insert on the gauge pad, perhaps surfacing wearable hard alloy material, gauge unit in drilling process with the mode correction borehole wall near grinding.
In conventional directional well drill bit, for drill bit has good guidance quality, the gauge length design is shorter usually, adopts simultaneously smooth gage surface to reduce frictional resistance, this passive gauge does not have cutting power, moment of torsion little to stratum, can control and play good action the tool-face at directed initial stage.
In recent years, the rotary steerable tool along with the development of drilling engineering directional technology occurs, require drill bit to have stronger lateral cutting ability, can cause moment of torsion excessive and improve merely drill bit side direction cutting power.For gauge, need to strengthen the research of active gauge, applicable new technology needs, and improves bit performance.
Three, existing gauge material.
Not only Structure of need research of the raising of gauge effect, need to improve gauge unit material performance simultaneously.
Existing gauge material comprises and uses diamond, cube nitrogenize magnetic or other superhard materials to make the gauge unit, and in drilling process, the gauge unit active correction borehole wall maintains hole diameter, or in directed drilling, carries out necessary master end and cut.Statistics shows: the application of the materials such as diamond composite teeth on gauge is the important directions of gauge Materials.
Gauge structure develops into initiatively gauge from passive gauge, and the gauge material develops into the composite material of high abrasion from low high-abrasive material, and the improvement of gauge effect can improve rate of penetration and the life-span of drill bit.
The utility model content
The purpose of this utility model is to overcome the shortcoming of prior art, a kind of function that reduces to rub, increase the wearing and tearing contact surface, has reaming hole and the smooth borehole wall is provided, extends drilling life of bit, utilizes the rolling action correction borehole wall to strengthen the device of bit gauge protection effect.
The purpose of this utility model is achieved through the following technical solutions: utilize the rolling action correction borehole wall to strengthen the device of bit gauge protection effect, it comprises by screw and is installed on the roller seat on the bit gauge protection cutting surface and is installed on pivotally the cylinder on roller seat by bearing pin, on described roller seat, be provided with at least a bearing pin, drum sleeve is loaded on bearing pin, the bearing pin two ends are installed on roller seat, axial line and the axis parallel of drill bit or the space angle that existence is less than 90 ° of the axial line of cylinder and cylinder parallel with vertical guide.
When two row or multi-row bearing pin, cylinder were set, the gap between adjacent row was greater than the spanner diameter of soket head cap screw, made soket head cap screw can be assembled on the side surface of drill bit.
When drill bit was vertically placed, the cutting teeth of cylinder on the axial line of drill bit rotates a circle the external diameter of a circle that forms and same level was identical around the rotate a circle external diameter of a circle of formation of the axial line of drill bit.
Described cylinder is fixedly arranged on bearing pin, on roller seat, is provided with the installing hole matched with the two ends of bearing pin, and bearing pin is installed on interior the going up of installing hole of roller seat pivotally, is provided with wear ring between bearing pin and roller seat.
Described cylinder is set on bearing pin pivotally, is provided with wear ring between cylinder and bearing pin, and the two ends of bearing pin all are fixedly connected with roller seat.
Described cylinder is set on bearing pin pivotally, between cylinder and bearing pin, be provided with wear ring, on roller seat, be provided with the installing hole matched with the two ends of bearing pin, bearing pin is installed on interior the going up of installing hole of roller seat pivotally, between bearing pin and roller seat, also is provided with wear ring.
Described roller seat is connected by key with drill bit, and is connected and fixed by screw.
Described bearing pin comprises bearing pin body and the wearing layer A that is arranged at this external surface of bearing pin, and described cylinder comprises the cylinder body and is arranged at the wearing layer B of its external surface Huo and inner surface.
On each bearing pin, be provided with one or more cylinders.
Described cylinder be shaped as cylinder, cone, spheroid, waist drum body, hollow body or their assembly; Its surface configuration is shiny surface, or the borehole wall is had to other surfaces of debugging functions.
Described bite type comprises the composite drill bit that PDC drill bit, diamond bit, impregnated bit or dissimilar drill bit form.
Research of the present utility model comprises following content:
One, the structure design of gauge device
By bearing pin, cylinder, wear ring, roller seat and soket head cap screw be connected to form the gauge device, determine parameter of structure design.
Two, the manufacturing process of gauge device
According to each parts relationship and the structure design result of gauge device, and the key issue such as erection sequence, the pair that is dynamically connected, consumable accessory, determine manufacture, the mounting process of gauge device.
Three, the design of cylinder
Design as the cylinder of gauge unit comprises structure design and design of material two aspects.The cylinder material of high abrasion, guarantee the application life of cylinder in the gauge process.
Four, the design of wear ring
Wear ring is compared with bearing pin or cylinder, is difficult for changing, and its design comprises design of material and manufacturing process.Select the material of high-performance (especially shock resistance, high abrasion), guarantee the application life of wear ring.
Five, the design of roller seat
Keyway arrangements is adopted in the design of roller seat, is arranged on drill bit by soket head cap screw.
The utlity model has following advantage:
One, strengthen the gauge effect, keep borehole diameter.
The utility model becomes rolling friction by the sliding friction of gauge effect, utilize the rollers roll effect correction borehole wall, reduce the friction of gauge unit and the borehole wall, increase the wearing and tearing contact surface of gauge unit and the borehole wall, increase simultaneously effective wear volume of gauge unit, realize strengthening the purpose of bit gauge protection effect.
Two, reaming hole and the smooth borehole wall, raising hole quality.
In directional well and horizontal well, drill bit outer rows of teeth live load is than much bigger in straight well, in the stratum that particularly abrasiveness is strong under high rotating speed, more easily lose external diameter, in directional well, horizontal well drilling, require the well wellbore quality got out high, require the smooth well of borehole wall cross section circle as far as possible, prevent covert undergauge.
The axis of gauge device of the present utility model and the relation of drill axis comprise parallel with staggered situation, and when gauge device axis was parallel with drill axis, it was to lead (ignore length travel, can think and make pure rolling) that cylinder be take rolling with respect to the motion of the borehole wall.When gauge device axis and drill axis are staggered angle, cylinder is " roll+slide " form with respect to the motion of the borehole wall, now the gauge device has reaming hole and smooth borehole wall effect, namely in the frictional force reduced with the borehole wall, has again certain lateral cutting ability, reach reaming hole and smooth borehole wall purpose, improve hole quality.
Three, reduce stability, the prolongation bit life of reaction torque, enhancing drill bit.
The gauge structure feature of directional well, horizontal well drilling and configuration directly affect stability, the guidance quality of drill bit.
Cylinder of the present utility model and the borehole wall, for the coupling of rolling, reduce the drilling process reaction torque, increase simultaneously gauge unit and borehole wall contact area, strengthen stability of bit.
If prior art in drilling process the gauge unit and the wall friction resistance large, can produce a large amount of frictional heats, simultaneously the rock active force is also larger, thereby affects the life-span of drill bit.Simultaneously, for the high condition of the shear strength of hard formation and hard interbedded layer, advance the process cutting teeth and bear very large moment of torsion, the tool-face fluctuation is large when orientation, wayward, whirling vibration easily occurs, it is just larger that cutting teeth bears high impact loads, cause diamond layer cracked or come off, cause cutting teeth to lose efficacy in advance.Gauge teeth particularly, if lost efficacy, drill bit no longer includes drilling depth, has greatly shortened its application life.
Gauge device of the present utility model makes the borehole wall smooth complete, and rolling friction is compared with sliding friction, and well track is regular, especially, in high angle hole and horizontal well, can reduce drilling process drill bit reaction torque, reduces the bit convolution probability, extends drilling life of bit.
Four, simple, the strong operability of manufacturing process, replacing are convenient.
Gauge device of the present utility model, for the position that is dynamically connected, adopts high-performance (shock resistance, high abrasion) material, guarantees application life, and simultaneously, each parts are easy for installation, strong operability.The cylinder directly contacted with the borehole wall is as the gauge unit, and the effect be subject to comprises friction, the extruding with the borehole wall or bearing pin, is one of consumable accessory in the gauge device, if be damaged, it is convenient to change.
In sum, the utility model, by the rolling action correction borehole wall, reduces the friction of cylinder and the borehole wall, increases the wearing and tearing contact surface of itself and the borehole wall, increases effective wear volume, strengthens the gauge effect; Simultaneously, the gauge unit can be " rolling " or " roll+slide " form with respect to the motion of the borehole wall, has the function of reaming hole and the smooth borehole wall, improves hole quality; Gauge unit and the borehole wall, for the coupling of rolling, reduce the drilling process reaction torque, strengthen stability of bit; The utility model makes well track regular, in high angle hole and horizontal well, can reduce drilling process drill bit reaction torque, reduces the bit convolution probability, extends drilling life of bit, improves rate of penetration.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model
Fig. 2 is the sectional structure schematic diagram of bowing of roller seat of the present utility model, bearing pin, cylinder syndeton
Fig. 3 is the left TV structure schematic diagram of roller seat of the present utility model, bearing pin, cylinder syndeton
Fig. 4 is mounting structure schematic diagram of the present utility model
Fig. 5 is the structural representation that the axis parallel of the axial line of cylinder and drill bit arranges
Fig. 6 is that the axial line of cylinder and the axial line of drill bit are the structural representation that space angle arranges
Fig. 7 is another kind of structural representation of the present utility model
Fig. 8 is the third structural representation of the present utility model
In figure, 1-screw, 2-roller seat, 3-bearing pin, 4-cylinder, 5-wear ring, 6-keyway, 7-screwed hole, 8-wearing layer A, 9-bearing pin body, 10-cylinder body, 11-wearing layer B, 12-drill bit.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described, protection domain of the present utility model is not limited to the following stated:
As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, utilize the rolling action correction borehole wall to strengthen the device of bit gauge protection effect, it comprises by screw 1 and is installed on the roller seat 2 on drill bit 12 gauge cutting surfaces and is installed on pivotally the cylinder 4 on roller seat 2 by bearing pin 3, on described roller seat 2, be provided with at least a bearing pin 3, cylinder 4 is set on bearing pin 3, bearing pin 3 two ends are installed on roller seat 2, axial line and the axis parallel of drill bit 12 or the space angle that existence is less than 90 ° of the axial line of cylinder 4 and cylinder 4 parallel with vertical guide, be that the parallel and axial line of cylinder 4 of vertical guide and the axial line of drill bit 12 are the spatial intersecting relation.Described screw 1 can be but is not limited to soket head cap screw.Utilize the cylinder 4 rolling action correction boreholes wall, reduce the friction of gauge unit and the borehole wall, increase the wearing and tearing contact surface of itself and the borehole wall, increase effective wear volume, realize strengthening the purpose of drill bit 12 gauge effects.
As shown in Figure 5, be the embodiment that the axis parallel of the axial line of cylinder 4 and drill bit 12 arranges, in this situation, cylinder 4 is ignored length travel with respect to the motion of the borehole wall, and can think and make pure rolling,
As shown in Figure 6, for and the axial line of the axial line of cylinder 4 and drill bit 12 be the embodiment that space angle arranges, in this embodiment, the space angle is 10 °, this situation bottom roll 4 be " rolling+slip " with respect to the motion of the borehole wall, and alternate angle is larger, sliding effect is more obvious.
As shown in Figure 3, when two row or multi-row bearing pin 3, cylinder 4 were set, the gap between adjacent row was greater than the spanner diameter of soket head cap screw, made soket head cap screw can be assembled on the side surface of drill bit 12.
As shown in Figure 1, Figure 2, Figure 3 shows, described cylinder 4 is fixedly arranged on bearing pin 3, on roller seat 2, be provided with the installing hole matched with the two ends of bearing pin 3, on bearing pin 3 is installed in the installing hole of roller seat 2 pivotally, between bearing pin 3 and roller seat 2, be provided with wear ring 5, in this situation, relative static between bearing pin 3 and cylinder 4, relative motion between bearing pin 3 and roller seat 2.
Also can be as shown in Figure 7, described cylinder 4 is set on bearing pin 3 pivotally, is provided with wear ring 5 between cylinder 4 and bearing pin 3, the two ends of bearing pin 3 all are fixedly connected with roller seat 2, in this situation, relative motion between bearing pin 3 and cylinder 4, relative static between axle and roller seat 2.
Also can be as shown in Figure 8, described cylinder 4 is set on bearing pin 3 pivotally, between cylinder 4 and bearing pin 3, be provided with wear ring 5, on roller seat 2, be provided with the installing hole matched with the two ends of bearing pin 3, bearing pin 3 is installed on interior the going up of installing hole of roller seat 2 pivotally, between bearing pin 3 and roller seat 2, also is provided with wear ring 5, in this situation, relative motion between bearing pin 3 and cylinder 4, also relative motion between bearing pin 3 and roller seat 2.
Three kinds of annexations of above-mentioned cylinder 4, bearing pin 3 and roller seat 2, can realize that all cylinder 4 does the gyration around cylinder 4 axial lines with respect to roller seat 2, thus self rolling while realizing that cylinder 4 directly contacts with the borehole wall, and the change sliding friction is rolling friction.
As shown in Figure 1, on drill bit 12, be provided with keyway 6 and screwed hole 7, described roller seat 2 is connected by key with drill bit 12, and is connected and fixed by screw 1.
Described bearing pin 3 comprises bearing pin body 9 and is arranged at the wearing layer A8 of bearing pin body 9 external surfaces, described cylinder 4 comprise cylinder body 10 and be arranged at its external surface or and the wearing layer B11 of inner surface;
In embodiment as shown in Figure 1, because cylinder 4 inner surfaces are fixedly connected with bearing pin 3, Gu only at the external surface of cylinder body 10, wearing layer B11 is set;
And as shown in Figure 7, Figure 8 in embodiment, the external surface of cylinder body 10 and inner surface wearing layer B11 all is set.
The material of described bearing pin body 9 and cylinder body 10 is steel, carbide alloy, powdered metallurgical material, non-ferrous metal, composite material, and the material of described wear ring 5, wearing layer A8 and wearing layer B11 is carbide alloy, composite polycrystal-diamond, polycrystalline diamond complex, TSP, impregnated, natural diamond impregnated of diamond, cubic boron nitride, pottery and the composite material that comprises carbide alloy, diamond or cubic boron nitride.
On each bearing pin 3, be provided with one or more cylinders 4.
In embodiment as shown in Figure 1, on each bearing pin 3, be provided with three cylinders 4; In embodiment as shown in Figure 8, on each bearing pin 3, be provided with a cylinder 4.The quantity that cylinder 4 is set on the quantity of bearing pin 3 and each bearing pin 3 is set on the roll shaft seat can be arranged as required.
Described cylinder 4 be shaped as cylinder, cone, spheroid, waist drum body, hollow body, obform body or their assembly, comprise dissimilar combination, as the combination of centrum and spheroid; Its surface configuration is shiny surface, or the borehole wall is had to other surfaces of debugging functions.
Described drill bit 12 types comprise the composite drill bit that PDC drill bit, diamond bit, impregnated bit or dissimilar drill bit 12 form.
Claims (9)
1. utilize the rolling action correction borehole wall to strengthen the device of bit gauge protection effect, it is characterized in that: it comprises by screw (1) and is installed on the roller seat (2) on drill bit (12) gauge cutting surface and is installed on pivotally the cylinder (4) on roller seat (2) by bearing pin (3), on described roller seat (2), be provided with at least a bearing pin (3), cylinder (4) is set on bearing pin (3), it is upper that bearing pin (3) two ends are installed on roller seat (2), the axis parallel of the axial line of cylinder (4) and drill bit (12) or the space angle that existence is less than 90 °.
2. the device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect according to claim 1, it is characterized in that: described cylinder (4) is fixedly arranged on bearing pin (3), on roller seat (2), be provided with the installing hole matched with the two ends of bearing pin (3), bearing pin (3) is installed on interior the going up of installing hole of roller seat (2) pivotally, is provided with wear ring (5) between bearing pin (3) and roller seat (2).
3. the device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect according to claim 1, it is characterized in that: described cylinder (4) is set on bearing pin (3) pivotally, between cylinder (4) and bearing pin (3), be provided with wear ring (5), the two ends of bearing pin (3) all are fixedly connected with roller seat (2).
4. the device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect according to claim 1, it is characterized in that: described cylinder (4) is set on bearing pin (3) pivotally, between cylinder (4) and bearing pin (3), be provided with wear ring (5), on roller seat (2), be provided with the installing hole matched with the two ends of bearing pin (3), bearing pin (3) is installed on interior the going up of installing hole of roller seat (2) pivotally, also is provided with wear ring (5) between bearing pin (3) and roller seat (2).
5. the device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect according to claim 1, it is characterized in that: described roller seat (2) is connected by key with drill bit (12), and is connected and fixed by screw (1).
6. according to the described device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect of any one in claim 2-4, it is characterized in that: described bearing pin (3) comprises bearing pin body (9) and is arranged at the wearing layer A(8 of bearing pin body (9) external surface), described cylinder (4) comprise cylinder body (10) and be arranged at its external surface or and the wearing layer B(11 of inner surface).
7. the device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect according to claim 1, is characterized in that: on each bearing pin (3), be provided with one or more cylinders (4).
8. the device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect according to claim 1 is characterized in that: described cylinder (4) be shaped as cylinder, cone, spheroid, waist drum body, hollow body or their assembly.
9. the device that utilizes the rolling action correction borehole wall to strengthen the bit gauge protection effect according to claim 1, it is characterized in that: described drill bit (12) type comprises PDC drill bit, diamond bit, impregnated bit or composite drill bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201837067U CN203308383U (en) | 2013-04-12 | 2013-04-12 | Device for amending well wall and improving drill bit gauge protection effect through action of rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201837067U CN203308383U (en) | 2013-04-12 | 2013-04-12 | Device for amending well wall and improving drill bit gauge protection effect through action of rolling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203308383U true CN203308383U (en) | 2013-11-27 |
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ID=49614599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201837067U Expired - Lifetime CN203308383U (en) | 2013-04-12 | 2013-04-12 | Device for amending well wall and improving drill bit gauge protection effect through action of rolling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203308383U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233683A (en) * | 2013-04-12 | 2013-08-07 | 成都保瑞特钻头有限公司 | Device for correcting well wall and enhancing drill gauge protection effect through rolling |
| CN110259389A (en) * | 2019-07-04 | 2019-09-20 | 立府精密机械有限公司 | A kind of rolling gage protecting bit and preparation method thereof |
-
2013
- 2013-04-12 CN CN2013201837067U patent/CN203308383U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233683A (en) * | 2013-04-12 | 2013-08-07 | 成都保瑞特钻头有限公司 | Device for correcting well wall and enhancing drill gauge protection effect through rolling |
| CN103233683B (en) * | 2013-04-12 | 2015-06-10 | 成都保瑞特钻头有限公司 | Device for correcting well wall and enhancing drill gauge protection effect through rolling |
| CN110259389A (en) * | 2019-07-04 | 2019-09-20 | 立府精密机械有限公司 | A kind of rolling gage protecting bit and preparation method thereof |
| CN110259389B (en) * | 2019-07-04 | 2021-01-12 | 立府精密机械有限公司 | Preparation method of rolling gauge protection drill bit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 611130 Wenjiang District, Chengdu, Sichuan, No. 123, Xingxin Road, Chengdu science and technology development park across the Taiwan Strait. Patentee after: Sichuan Bao Wright drill Co.,Ltd. Address before: 611130 Wenjiang District, Chengdu, Sichuan, No. 123, Xingxin Road, Chengdu science and technology development park across the Taiwan Strait. Patentee before: Chengdu Baoruite Drill Bit Co.,Ltd. |
|
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 611130 No. 30, West Section of Second Ring Road, Tianyuan Town, Zheyang District, Deyang City, Sichuan Province Patentee after: Sichuan Bao Wright drill Co.,Ltd. Address before: 611130 Wenjiang District, Chengdu, Sichuan, No. 123, Xingxin Road, Chengdu science and technology development park across the Taiwan Strait. Patentee before: Sichuan Bao Wright drill Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |