CN2126305U - Plug-in type eccentric borehole-enlarging drilling device - Google Patents
Plug-in type eccentric borehole-enlarging drilling device Download PDFInfo
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- CN2126305U CN2126305U CN 92214638 CN92214638U CN2126305U CN 2126305 U CN2126305 U CN 2126305U CN 92214638 CN92214638 CN 92214638 CN 92214638 U CN92214638 U CN 92214638U CN 2126305 U CN2126305 U CN 2126305U
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Abstract
The utility model discloses a draw-insert type eccentric hole enlarging drilling device for enlarging holes, drilling, chiseling and enlarging, drilling and chiseling bottom of the rock, earth inside wells [holes] and for cutting casing tubes inside the wells [holes]. The draw-insert type eccentric hole enlarging drilling device is composed of a casing bit 2 and a center drill 7. The casing bit is arranged on the end part of a casing tube 6; the center drill is arranged inside the inner cavity of the casing tube and is connected with a drill rod; The draw-insert type eccentric hole enlarging drilling device comprises an eccentric function control part, an eccentric bit part and a positioning stabilization part. When the draw-insert type eccentric hole enlarging drilling device works, the center drill is made to revolve around axle via earth surface devices so as to enlarge hole diameters in radial direction; when the center drill moves in the axle direction, the draw-insert type eccentric hole enlarging drilling device can continuously enlarge holes or lifting the drill. The utility model avoids happening the accident that an eccentric convex block is squeezed and clamped by rocks to make the drill clamped in the prior art.
Description
The utility model relates to a kind ofly to be implemented the hole enlargement Drilling and expands the subdrilling cutter and well (hole) inner sleeve is implemented the device of cutting well (hole) Nei Yan, soil, particularly relates to a kind of draw and insert-type eccentric-hole enlarging drilling device.
Up to now, external down-hole eccentric reaming drilling system more generally adopts the ODEX covering layer of Sweden A Pute Lars science popularization section (Allas Copco) and Sang Deweike (Sandwik) company development to creep into guard system.Its eccentric reaming part mainly is made up of guide's drill bit and the eccentric projection that is sleeved on guide's drill bit, by dextrorotation or derotation center drilling tool, make between guide's drill bit and the eccentric projection and produce angular displacement, thereby eccentric projection is released or withdrawal, crept into or propose the center drilling tool to realize the down-hole eccentric reaming.Because the generation of the relative angular displacement of guide's drill bit and eccentric projection, also must rely on the frictional resistance between shaft bottom ground and drilling tool, so it is not at every turn can both be successful that the opening of eccentric projection held back action, and eccentric projection is also easily squeezed folder by ground and is produced lock of tool drilling.This class eccentric reaming system is maximum to be 254mm with the pipe diameter.
A kind of Sim-Cas that Britain's Halifax ［ Halifax ］ company takes is with guard system, and is similar to ODEX method principle.
Belgium Stanwyck ［ Stenvik ］ company has taked to be called " Saturn " and reach " Neptune " ［ Sturne-Neplune ］ and follow pipe bit to enter system.Its eccentric reaming partly is to utilize spiral expansion joint control to be with the sleeve of boss upper and lower mobile, and with release or withdrawal eccentric projection drill bit, and the elongation of spiral expansion joint still relies on the dextrorotation of center drilling tool or derotation to move with shortening.So its cardinal principle is still similar with the ODEX method, its eccentricity control function all is to take the rotation mode of center drilling tool.
The purpose of this utility model is to provide a kind of draw and insert-type eccentric-hole enlarging drilling device, and this device can carry out the interior hole enlargement of well ［ hole ］ fruitfully, expand bed rock earth boring auger cutter and sleeve pipe cutting.
The purpose of this utility model is achieved in that promptly: this draw and insert-type eccentric-hole enlarging drilling device has a pipe bit that is contained in cannula tip, one be contained in the pipe bit inner chamber and with the joining center of drilling rod drilling tool.This device comprises eccentric function controlling part branch, off-balance bit part and positioning stablity part.Make its center drilling tool radially enlarge the aperture by surface equipment in this device busy, and drilling tool is crept into or promote in the continuous reaming of motion realization vertically around the axle revolution.
Concrete structure of the present utility model is provided by the following drawings.
Fig. 1 creeps into the operating principle schematic diagram for the draw and insert-type eccentric-hole enlarging drilling device reaming;
Fig. 2 carries driller for draw and insert-type eccentric-hole enlarging drilling device and makes principle schematic;
Fig. 3 is the structure chart of eccentric spline housing of the present utility model;
Fig. 4 is that Fig. 3 A-is in sectional drawing;
Fig. 5 is centering splined shaft figure of the present utility model;
Fig. 6 is Fig. 5 A-A sectional drawing;
Fig. 7 is Fig. 5 B-B sectional drawing;
Fig. 8 is an eccentric rock bit structure chart of the present utility model;
Fig. 9 is the upward view of Fig. 8;
Figure 10 is the utility model positioning stablity damping tap structure chart;
Figure 11 is Figure 10 A-A sectional drawing;
Figure 12 is Figure 10 B-B sectional drawing;
Figure 13 is the general structure schematic diagram of the utility model first embodiment;
Figure 14 is Figure 13 A-A sectional drawing;
Figure 15 is Figure 13 B-B sectional drawing;
Figure 16 is the general structure schematic diagram of the utility model second embodiment;
Figure 17 is Figure 16 A-A sectional drawing;
Figure 18 is Figure 16 B-B sectional drawing;
Figure 19 is Figure 16 C-C sectional drawing.
Below will further describe concrete structure of the present utility model and working condition referring to accompanying drawing.
Referring to Fig. 1, a kind of draw and insert-type eccentric-hole enlarging drilling device of the utility model, it is characterized in that a pipe bit 2 that is contained in cannula tip and one is contained in its inner chamber with the joining center of drilling rod drilling tool 7.
Referring to Figure 13, described center drilling tool 7 is by taking over 5 joining eccentric rock bit 1, centering splined shaft 16 with drill bit, the eccentric spline housing 4 that matches and connect with centering splined shaft and centering carrier 3, and form this center drilling tool and the pipe bit 2 common formation first embodiment of the present invention successively with the location loading disc 5 that is connected as one of centering splined shaft, the lower contact 11 of down-the-hole hammer, down-the-hole hammer 9, the top connection 10 of down-the-hole hammer, positioning stablity damping tap 8.
Referring to Figure 16, described center drilling tool 7 is by taking over 5 joining eccentric rock bit 1, the centering splined shafts 16 that anti-circulation injector 13 is housed with drill bit, the eccentric spline housing 4 that matches and connect with centering splined shaft and centering carrier 3, and successively with the location loading disc 5 that combines as a whole of centering splined shaft, tap 12, down-the-hole hammer 9, the top connection 10 of down-the-hole hammer, positioning stablity damping tap 8, mozzle 14 are formed down, this center drilling tool and the casing joint 2 common formation second embodiment of the present invention.
Referring to Fig. 8-9, described eccentric rock bit 1 is formed by three support and threaded bit body assembly weldings that gear wheel is housed, and one of them is super addendum cone gear wheel, and all the other two for carrying an awl gear wheel, the installation of giving up the throne of truncated cone gear wheel, and between super addendum cone gear wheel one eccentric distance e is arranged
2This drill bit is positioned at center drilling tool 7 bottom, and axial loading and revolution driving by the center drilling tool can play the eccentric reaming effect, can work the effect of creeping into again.
Described pipe bit 2 is assemblied in sleeve pipe 6 bottom.This drill bit bottom is interior ring sword structure, 10 °～15 ° of the basils, blade tip applies welding powder end alloy, drill bit top has interior step, cooperate with centering carrier 3, the shock loading that down-the-hole hammer 9 produces puts on eccentric rock bit 1, also by centering carrier 3 shock loading is put on pipe bit 2 simultaneously, generation follows up outer layer sleeve and center drilling tool to the impact tractive force of sleeve pipe 6 synchronously.Meanwhile, by vertical loading of sleeve pipe 6 and the top commentaries on classics driving reverse with the center drilling tool, pipe bit can work the effect of creeping into again, realizes that a complete set of pipe bit advances.This bit exterior also is welded with the rib bar at 65 °～70 ° of angles, has both formed ash pit, plays the guarantor that pipe bit creeps into again and directly acts on.
Referring to Figure 17, described centering carrier 3 is sleeved on center drilling tool 7 bottoms.This part is a garden dish with inner via hole, and there are four arc-like rows slag chutes the outside.Carry when boring and being shelved on the support lugn of eccentric rock bit 1, when boring down this dish at first contact and the seat on the interior step of pipe bit 2, the center drilling tool continues to descend, eccentric spline housing 4 inserts this disk centring hole, play eccentric centering effect, eccentric rock bit 1 is radially released, make it and the center drilling tool between produce eccentric distance e ［ e=e
1+ e
2, reach the eccentric reaming position.
Referring to Fig. 3-4, described eccentric spline housing is sleeved on the outer step of centering splined shaft 16 with the internal spline structure.This eccentric bushing is one and has eccentric distance e
1The eccentric spline housing of eccentric band flange structure because its spline structure, make its eccentric distance e
1Eccentric distance e with eccentric rock bit 1
2Form adjustable eccentric apart from system, regulate eccentric throw error＜5%, have the function of the comprehensive regulated at will eccentric throw of high accuracy.The duty eccentric band flange inserts centering carrier 3, and eccentric rock bit 1 is radially released the reaming position, realizes eccentric reaming.
Referring to Figure 13,16, described location loading disc 5 is assemblied in the lower end of down-the-hole hammer lower contact 11 or following tap 12 with helicitic texture.This dish is the disk of latus rectum screw thread in the tool.The duty seat had both played the axial location effect of eccentric spline housing 4 on the centering carrier, the shock loading that down-the-hole hammer 9 is produced passes to pipe bit 2 through centering carrier 3 simultaneously, sleeve pipe 6 is produced impact tractive force.
Described sleeve pipe 6 is the outer tube with respect to the center drilling tool, and the lower end is connected with pipe bit 2, and top cooperates with the well head sleeve driving device.Sleeve pipe is the many tubular steel pipes that two ends have helicitic texture or without screw thread joint geometry, can arbitrarily connect into the length that needs.Centering correcting effect and retaining wall effect outside in the eccentric reaming device, plaing, the top reprinting lotus that axially reaches that simultaneously the well head sleeve driving device is produced passes to pipe bit 2, make it to have drilling ability, realize that a complete set of pipe bit advances, and hauled load is impacted in acceptance, in the eccentric reaming drilling process, follow up synchronously with the center drilling tool.
Referring to Figure 13, described down-the-hole hammer 9 is assemblied between down-the-hole hammer lower contact 11 or following tap 12 and the top connection 10 of down-the-hole hammer.The down-the-hole hammer is an approved product, and its main effect is that compressed-air actuated heat energy is converted into impact energy, and eccentric rock bit 1 and pipe bit 2 are applied shock loading.
The top connection 10 of described down-the-hole hammer is assemblied between positioning stablity damping tap 8 and the down-the-hole hammer 9, all connects with helicitic texture.The main effect of this joint has been the interconnect function between above-mentioned two component, works to carry gas working dielectric by this joint centre bore simultaneously.
Described down-the-hole lower contact 11 is assemblied between down-the-hole hammer 9 and the centering splined shaft 16, all connect with helicitic texture, and this joint lower end is connected with location loading disc 5 with external thread structure.The main effect of this joint also has been interconnect function between upper and lower two component and the effect of getting rid of gas by centre bore conveying down-the-hole hammer; This joint also works to transmit shock loading by location loading disc 5,3 pairs of pipe bits 2 of centering carrier simultaneously.
Referring to Figure 16, the assembly relation of described down tap 12 and the lower contact of down-the-hole hammer and structure and mainly effect identical point is all arranged.Its dissimilarity is that interior pipe and socket that two bar shaped passages will increase are welded as a whole, and the outside lower end of this joint cooperates with mozzle with the pattern of O RunddichtringO again.The said structure of this joint has the effect that makes working fluid and the shunting of deslagging fluid.
Centering splined shaft 16 is assemblied between down-the-hole hammer lower contact 11 or following tap 12 and the drill bit catcher 15, all connects with helicitic texture.This spline structure cooperates with eccentric spline housing 4, make the reaming eccentric throw have the comprehensive random adjustability of high accuracy, play simultaneously eccentric in the centering effect, also play up and down interconnect function between two parts and gas or the deslagging fluid of carrying the down-the-hole hammer to discharge.
Referring to Figure 10-12, described positioning stablity damping tap 8 is by inner and outer pipe 17,18, damping plug frame 19, and damping plug 20, backing plate 21, locking nut 22, oil seal cover 23, bearing 24, hold-down nut 25, oil sealing 26 and internal and external antithetical couplet fishplate bar 27,28 are formed.
Positioning stablity damping tap is assemblied on the top connection 10 of down-the-hole hammer and between the double-wall drill pipe.This joint has single action structural damping plug and inner and outer pipes flow dividing structure and three layers of pipe connecting structure.Damping plug had both played eccentric radial location stabilization, played the damping plug effect again in tapping process, forced along the drilling cuttings that returns on the annular gap between sleeve pipe 6 and the center drilling tool and entered interior pipe, the anti-deslagging that circulates in realization center by three ash pits of this joint.Pipe lower end shutoff in this joint, compressed air enters the down-the-hole hammer through inner and outer pipes annular gap and down-the-hole hammer top connection centre bore and is converted into impact energy, the gas of getting rid of carries on the drilling cuttings through the drill bit bottom and returns, under the effect of resistance plug, force drilling cuttings to enter interior pipe as above-mentioned, form working fluid and deslagging fluid shunting circulation along ash pit.The interior junction plate 27 of this joint or outside link plate 28 are connected with mozzle 14 with the connected mode of flange, can make mozzle and center drilling tool revolution or single action synchronously.Behind device mozzle 14 and the following tap 12, under the effect of damping plug, the deslagging fluid forms directly that the center is counter at the bottom of the hole circulates, hammering annular gap between 9 by the strip channel of following tap into shape through mozzle 14 and down-the-hole enters and manages 17 in the positioning stablity damping tap, form the anti-deslagging that circulates in center thus again, this slagging channel is under the constant condition of air demand, can improve the speed of backflowing on the deslagging fluid, increase deslagging ability.
Inner and outer pipe 17,18 is the part of positioning stablity damping tap 8, is equipped with ash pit on its tube wall, by ash pit two pipes is welded together, the lower end shutoff.Annular gap between two pipes plays a part to carry the deslagging fluid and makes working fluid and deslagging fluid shunting circulation.Outer tube still is the mandrel of damping plug frame 19 in addition.
Backing plate 21 is parts of positioning stablity damping tap 8, is sleeved on the damping plug 20 on damping plug frame 19 tops.This backing plate is that coil in a garden with inner via hole, and main effect is to regulate to play the packing ring effect when compressing damping plug 20.
Outside link plate 28 is parts of positioning stablity damping tap 8, and welded and installed is in damping plug frame 19 bottoms, and internal diameter and interior junction plate keep certain interval.This junction plate also is the flange that bolt hole has internal thread, and its effect is with flange pattern connection mozzle 14, and the mozzle of An Zhuaning has single action when work like this.
According to the above-mentioned draw and insert-type eccentric-hole enlarging drilling device that assembles, its operating principle is summarized as follows.
Referring to Figure 13, center drilling tool 7 in the decline process, when the interior step of centering carrier 3 contact sleeve pipe bits 2 on this step, the center drilling tool continues to descend, eccentric spline housing 4 inserts the centre bore of centering carrier 3, and location loading disc 5 contacts with centering load plate 3, realizes eccentric axial location.8 of positioning stablity damping taps play radially stabilization of off-centre, also play the damping shunting action simultaneously.At this moment, the bottom that eccentric rock bit 1 has been stretched out pipe bit 2, centre of gyration drilling tool 7, implement the down-hole eccentric reaming, meanwhile, down-the-hole hammer 9 also arrives the operating position, the shock loading that it applied applies axial load by its lower contact 11, location loading disc 5, centering carrier 3, pipe bit 2 to sleeve pipe 6, to overcome the frictional resistance between the sleeve pipe and the borehole wall, outer layer sleeve 6 and center drilling tool are followed up synchronously, thereby realize that the continuous eccentric reaming in down-hole selects into.When promoting drilling tool, the clutch of each part is opposite with said process, can freely extract eccentric lifting drilling tool at any time out, thereby reach purpose of the present invention.
Figure 16 has expressed second embodiment of the present utility model, the main distinction of this embodiment and first embodiment is dreg removing system, the down-the-hole hammer lower contact that is about among first embodiment changes down tap 12 into, in eccentric rock bit 1, increased anti-circulation injector 13, and correspondingly will descend between tap 12 and the eccentric rock bit 1 to change two-layer pipe into, other has increased mozzle 14 and has linked with the interior junction plate 27 of locating damping tap 8, turn round synchronously with the center drilling tool, as linking, then can realize single action between center drilling tool and the mozzle with outside link plate.This cover drilling system can be realized the directly anti-circulation in shaft bottom, boring mud can enter centre bore in the drill bit bottom, boring mud is from tap window discharge down then, rise along the annular clearance between mozzle and the down-the-hole hammer, enter the middle pit of the stomach through positioning stablity damping tap window again, the anti-deslagging that circulates in formation center.
As mentioned above, the utility model eccentric-hole enlarging drilling device can become the supporting technology system and device that arbitrary a complete set of pipe bit enters system, realizes that continuous down-hole eccentric reaming creeps into, and becomes the core ingredient that a complete set of pipe bit enters system.
The utility model compared with prior art, its fundamental difference is the change to the eccentricity control function, the drilling tool axially-movable pulls and pushes control mode centered by changing the gyration control mode of center drilling tool, makes it all can accurately eccentric tri-cone rotary drill bit radially be released the reaming position at every turn. Have the following advantages in addition.
One, eccentric tri-cone rotary drill bit reaming projection without acceptance of persons, itself has eccentric throw eccentric tri-cone rotary drill bit, is guide's drill bit, is again the eccentric reaming drill bit, and projection is squeezed the lock of tool drilling that folder is produced by rock when having avoided eccentric reaming in the prior art.
Two, eccentric spline housing adjustable eccentric is apart from e1With the fixing eccentric distance e of drill bit2Form the eccentric throw Adjustment System, actual eccentric distance e is e1And e2Algebraical sum, can in positive and negative interval, arbitrarily regulate positive and negative eccentric throw, this is the function that prior art does not have.
Three, positioning stablity damping tap has eccentric revolution and stirs and radially cushion the positioning stablity effect, keeps simultaneously that the central upper portion drilling tool is stable to pivot.
Four, the utility model also has the function that the basement rock eccentric reaming creeps into except having the eccentric reaming function equal with prior art at the Quaternary system covering layer.Our experiments show that in the mud stone of drillability 5-7 level, chiltern mud stone, feldspar quartz sandstone, realize that successfully the continuous down-hole eccentric reaming of 600mm diameter sleeve pipe creeps into 10.28 meters, outer layer sleeve and center drilling tool follow up synchronously.It compared with prior art is a big breakthrough.
Five, the utility model also can widened range of application aspect the expansion end and the sleeve pipe cutting except that the function with prior art.
Claims (10)
1, a kind of draw and insert-type eccentric-hole enlarging drilling device, it is characterized in that a pipe bit 2 that is contained in sleeve pipe 6 ends and one is contained in its inner chamber with the joining center of drilling rod drilling tool 7.
2, according to the described draw and insert-type eccentric-hole enlarging drilling device of claim 1, it is characterized in that pipe bit 2 bottoms are interior ring sword structure, the basil is 10～15 °, and blade tip applies welding powder end alloy, and drill bit top has interior step.
3, according to the described draw and insert-type eccentric-hole enlarging drilling device of claim 1, it is characterized in that center drilling tool 7 by the eccentric spline housing 4 of taking over 5 joining eccentric rock bit 1, centering splined shaft 16, matching and connect with centering splined shaft and centering carrier 3 with drill bit, and the location loading disc 5, the lower contact 11 of down-the-hole hammer, down-the-hole hammer 9, the top connection 10 of down-the-hole hammer, positioning stablity damping tap 8 compositions that combine as a whole with the centering splined shaft successively.
4, according to the described draw and insert-type eccentric-hole enlarging drilling device of claim 1, it is characterized in that center drilling tool 7 is by taking over 5 joining eccentric rock bit 1, the centering splined shafts 16 that anti-circulation injector 13 is housed with drill bit, the eccentric spline housing 4 that matches and connect with centering carrier 3 and centering splined shaft, and the location loading disc 5 that combines as a whole with the centering splined shaft successively, tap 12, down-the-hole hammer 9, the top connection 10 of down-the-hole hammer, positioning stablity damping tap 8, mozzle 14 are formed down.
5, according to claim 3,4 described draw and insert-type eccentric-hole enlarging drilling devices, it is characterized in that eccentric rock bit 1 is formed by three support and threaded bit body assembly weldings that gear wheel is housed, one of them is super addendum cone gear wheel, all the other two is the truncated cone gear wheel, the installation of giving up the throne of truncated cone gear wheel, and between super addendum cone gear wheel one eccentric distance e is arranged
2
6,, it is characterized in that between the axial line of eccentric spline housing and gabarit flange one eccentric distance e being arranged according to claim 3,4 described draw and insert-type eccentric-hole enlarging drilling devices
1, and, constitute the eccentric adjusting system with centering splined shaft and eccentric rock bit.
7, according to claim 3,4 described draw and insert-type eccentric-hole enlarging drilling devices, the carrier 3 that it is characterized in that feeling relieved is one to have the disk of inner via hole, and gabarit has the arc-like rows slag chute.
8, according to claim 3,4 described draw and insert-type eccentric-hole enlarging drilling devices, it is characterized in that locating loading disc 5 is a disk with interior latus rectum screw thread.
9, according to claim 3,4 described draw and insert-type eccentric-hole enlarging drilling devices, it is characterized in that positioning stablity damping tap 8 is by interior pipe 17, outer tube 18, damping plug frame 19, damping plug 20, backing plate 21, locking nut 22, oil seal cover 23, bearing 24, hold-down nut 25, oil sealing 26 and inside and outside gusset piece 27,28 are formed.
10,, be equipped with ash pit on the tube wall of pipe 17 and outer tube 18 in it is characterized in that according to the described draw and insert-type eccentric-hole enlarging drilling device of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92214638 CN2126305U (en) | 1992-05-16 | 1992-05-16 | Plug-in type eccentric borehole-enlarging drilling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92214638 CN2126305U (en) | 1992-05-16 | 1992-05-16 | Plug-in type eccentric borehole-enlarging drilling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2126305U true CN2126305U (en) | 1992-12-30 |
Family
ID=4959169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92214638 Granted CN2126305U (en) | 1992-05-16 | 1992-05-16 | Plug-in type eccentric borehole-enlarging drilling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2126305U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205796B (en) * | 2006-12-20 | 2011-06-01 | 杜晓瑞 | Device for drilling big borehole with small drill head |
| CN101713279B (en) * | 2009-11-04 | 2013-01-02 | 中国石油大学(北京) | Deviation prevention and fast drilling technology of eccentric drilling tool assembly |
| CN107002464A (en) * | 2014-12-30 | 2017-08-01 | 哈利伯顿能源服务公司 | Wellbore tool reaming device assembly |
| CN113027343A (en) * | 2021-04-12 | 2021-06-25 | 西华大学 | Eccentric rotary positioning tool |
-
1992
- 1992-05-16 CN CN 92214638 patent/CN2126305U/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205796B (en) * | 2006-12-20 | 2011-06-01 | 杜晓瑞 | Device for drilling big borehole with small drill head |
| CN101713279B (en) * | 2009-11-04 | 2013-01-02 | 中国石油大学(北京) | Deviation prevention and fast drilling technology of eccentric drilling tool assembly |
| CN107002464A (en) * | 2014-12-30 | 2017-08-01 | 哈利伯顿能源服务公司 | Wellbore tool reaming device assembly |
| CN113027343A (en) * | 2021-04-12 | 2021-06-25 | 西华大学 | Eccentric rotary positioning tool |
| CN113027343B (en) * | 2021-04-12 | 2023-09-29 | 定边县泽林石油工程有限公司 | Eccentric rotary positioning tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |