CN206647083U - A kind of two-tube drilling tool detent mechanism - Google Patents
A kind of two-tube drilling tool detent mechanism Download PDFInfo
- Publication number
- CN206647083U CN206647083U CN201720181996.XU CN201720181996U CN206647083U CN 206647083 U CN206647083 U CN 206647083U CN 201720181996 U CN201720181996 U CN 201720181996U CN 206647083 U CN206647083 U CN 206647083U
- Authority
- CN
- China
- Prior art keywords
- bullet card
- tube
- bullet
- card
- drilling tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
A kind of two-tube drilling tool detent mechanism, belongs to drilling equipment technical field, and it includes double-strand chain bullet card component, thimble positioning component and spring reset component；Double-strand chain bullet card component card holder of being hit by a bullet is arranged in bullet card room, holding tank is provided with card holder is played, the bullet card, supporting plate is arranged in the holding tank for playing card holder, the rotary hole set on bullet card and the first bearing pin gap, which coordinate, assembles, the supporting plate is provided with escape groove, the first bearing pin both ends are fixed in two side walls of escape groove, the supporting plate is additionally provided with the second pin shaft hole coordinated with the second bearing pin gap, the second bearing pin both ends, which are fixed on, to be played in card holder receiving groove sidewall, the torsion spring connects the bullet card of left and right two, the adapter coupling is arranged on above bullet card room, the bullet card room is arranged in the upper end of two-tube drilling tool outer tube.The utility model solves the problems, such as that two-tube drilling tool can not salvage inner tube in troublesome zone drilling, improves core-drilling operating efficiency, reduces operator's labor intensity.
Description
Technical field
A kind of detent mechanism is the utility model is related to, especially a kind of two-tube drilling tool suitable for wire line core drilling positions
Mechanism, belong to drilling equipment technical field.
Background technology
In order to grasp subsurface geology situation, the mode of generally use drilling and coring delivery directly obtains true and reliable subterranean strata
Data, carry brill comprehensively using single tube drilling tool in early days and obtain rock core, with the development of drilling technology, two-tube drilling tool obtains extensively should
With especially the core drill of matching wire line core drilling is so that its drilling efficiency is high, labor intensity is low, cost is low, boring accidents
The advantages that few and to be applied to Solid Mineral geological prospecting, troublesome zone drilling, hydrogeologic prospecting, oil drilling prospecting etc. more
Individual prospecting drilling field.
Wire line core drilling is that one kind can not propose drill bit, drilling tool outer tube and drilling rod, from the method for bottom hole removal of core.Even
Then inner tube of the outer basket of drill bit with accommodating rock core, is positioned using bullet card detent mechanism, can be real during salvaging
Now disengage.After creeping into certain drilling depth and being no more than inner tube length, termination of pumping stops boring, from ground out of drilling rod with seizing wire
Enter fisher, transfer to bottom hole and fish for drilling tool inner tube, then above put forward off card, separate inner and outer pipes, by interior pipe drilling tool out of drilling rod
And rock core is mentioned ground and cored, after rock core takes out, interior pipe drilling tool is put into shaft bottom out of drilling rod again, detent mechanism is again
It is secondary to block, turn on pump circulation, continue core-drilling.
The two-tube drilling tool detent mechanism for matching wire line coring method in the prior art uses single pin joint bullet card or ball card knot
Structure, wherein single pin joint bullet card structure when Complex formation drilling is cored, the situation of rock core blockage easily occurs, such as accompanying drawing 1
Shown, in normal coring, the present position of bullet card 1 of single pin joint bullet card structure is reserved with apart from the bottom surface of adapter coupling 3
Certain space, bullet card 1 not being influenceed and is turned round into drilling tool, Fig. 2 is that recovery tube 2 moves up after the stifled heart occurs for inner tube, bullet card 1 and bullet card
The bottom surface dieback of stopper 3, bullet card 1 lose rotary space, and rigid knot is formed with adapter coupling 3, bullet card room 4, hinge A and bullet card holder
Structure, cause the recovery failure of bullet card 1, drilling tool in well can only be now carried to earth's surface and be handled, greatly reduce coring effect
Rate, improve operator's labor intensity and construction cost；Asked although the locking bit architecture of ball can effectively solve drilling tool inner tube dieback
Topic, but because ball and bullet card room contact to put, when core plugging is serious, bullet card room is very big by steel ball active force, during use
Bullet card room expansion cleavage phenomenon be present, easily cause drilling accident.
Utility model content
The utility model provide a kind of good reliability, it is practical, two-tube drilling tool can be efficiently solved bored in bad ground
The problem of inner tube can not be salvaged when entering, the two-tube drilling tool positioning for improving core-drilling operating efficiency, reducing operator's labor intensity
Mechanism.
To achieve the above object, technical scheme is used by the utility model：
A kind of two-tube drilling tool detent mechanism, including double-strand chain bullet card component, thimble positioning component and spring reset component；Institute
Double-strand chain bullet card component is stated provided with bullet card, torsion spring, the first bearing pin, supporting plate, the second bearing pin, bullet card holder, adapter coupling and bullet card
Room, the bullet card holder are arranged in bullet card room, holding tank are provided with card holder is played, the bullet card, supporting plate are arranged in bullet card holder
Holding tank in, bullet card, supporting plate include symmetrical two parts, in its each section, the revolution that is set on bullet card
Hole coordinates with the first bearing pin gap assembles, and the supporting plate is provided with the escape groove that rotary space is provided for bullet card, first pin
Axle both ends are fixed in two side walls of escape groove, and the supporting plate is additionally provided with the second pin shaft hole coordinated with the second bearing pin gap,
The second bearing pin both ends, which are fixed on, to be played in card holder receiving groove sidewall, and the torsion spring connects the bullet card of left and right two, described
Adapter coupling is arranged on above bullet card room, and the bullet card room is arranged in the upper end of two-tube drilling tool outer tube；The thimble positioning component,
Spring reset component is equipped with double-strand chain bullet card component.
Above-mentioned two-tube drilling tool detent mechanism, the thimble positioning component include thimble, straight pin and recovery tube, the thimble
Upper end is sleeved on straight pin with gap fiting mode, and thimble lower end is inlaid in supporting plate of double-strand chain bullet card component or so two
Among point, the recovery tube is made up of upper recovery tube and lower recovery tube, and the straight pin both ends are fixed on the side wall of lower recovery tube
On.
Above-mentioned two-tube drilling tool detent mechanism, the spring reset component be provided with upper positioning seat, back-moving spring, lower positioning seat and
Studs, the lower positioning seat are arranged on upper recovery tube and lower recovery tube junction, and the studs lower end passes through down
Positioning seat is connected with playing card holder upper end, and studs upper end is connected with upper positioning seat, and the back-moving spring is set with studs,
Between upper positioning seat and lower positioning seat.
Above-mentioned two-tube drilling tool detent mechanism, the double-strand chain bullet card component are additionally provided with support base, and the support base is positioned at branch
Below fagging, it is fixedly mounted on and plays in card holder.
Above-mentioned two-tube drilling tool detent mechanism, first bearing pin, the second bearing pin are elastic latch structure；First bearing pin
Both ends and the first pin shaft hole interference fit being arranged in two side walls of supporting plate escape groove；The second bearing pin both ends with
Play the 3rd pin shaft hole interference fit in card holder.
Above-mentioned two-tube drilling tool detent mechanism, the bullet are arranged with torsion spring hole, and bullet card passes through the torsion spring hole and one end
Connection.
Above-mentioned two-tube drilling tool detent mechanism, the upper recovery tube are connected through a screw thread mode with lower recovery tube and are connected.
Above-mentioned two-tube drilling tool detent mechanism, the studs are being provided with locking screw with upper positioning seat, bullet card holder junction
It is female.
The utility model is after adopting the above technical scheme, the effect with following technological progress：
The utility model solves by the cooperation of double-strand chain bullet card component, thimble positioning component and spring reset component
Bullet card recovery Problem of Failure, its operation principle are in the case of bullet card and adapter coupling bottom surface dieback：When core drill inner tube goes out
After now blocking up heart phenomenon, bullet card is in dieback state, bullet card, adapter coupling, bullet card room, supporting plate and bullet card with adapter coupling bottom surface
Frame forms rigid structure；Now decentralization fisher fishes for inner tube, moves up recovery tube, drives thimble upward by straight pin
Specified location is moved to, thimble lower end is released and the position constraint of the supporting plate of left and right two is acted on, discharge the revolution of supporting plate certainly
By spending, realize supporting plate to internal rotation, at the same band move card the centre of gyration downwards, move inward, so as to discharge enough skies
Between, neutralizing bullet card and the rigid structure occurred after the dieback of adapter coupling bottom surface, under the thrust of lower recovery tube, bullet card and bullet
Block head separates；Recovery tube continues to move up, and bullet card is pushed into inside drilling tool, recovery and the unfreezing of bullet card is realized, so as to ensure
Being smoothed out of inner tube fishing.As can be seen here, the utility model solve two-tube drilling tool in troublesome zone drilling without
Method salvages the problem of inner tube, is effectively improved core-drilling operating efficiency, reduces operator's labor intensity.
Brief description of the drawings
List pin joint bullet card view when Fig. 1 is normal coring；
Fig. 2 is that single pin joint bullet card view after the stifled heart occurs for inner tube；
Fig. 3 is two-tube drilling tool detent mechanism cross-sectional view described in the utility model；
Fig. 4 is to play card structure schematic diagram (by taking the bullet card of right side as an example)；
Fig. 5 is supporting plate structure schematic diagram (by taking Right side support plate as an example)；
Fig. 6 is Fig. 5 side view；
Fig. 7 is to play card holder main sectional view；
Fig. 8 is to play card holder sectional view；
Fig. 9 to Figure 11 is two-tube drilling tool detent mechanism unfreezing process schematic；
Figure 12 is that the utility model is in dieback state lower stress analysis chart in bullet card and adapter coupling bottom surface.
Each label is expressed as in figure：1st, bullet card, 1-1, rotary hole, 1-2, torsion spring hole, 2, recovery tube, 2-1, upper recovery tube,
2-2, lower recovery tube, 3, adapter coupling, 4, bullet card room, 5, supporting plate, 5-1, the first pin shaft hole, 5-2, escape groove, 5-3, second
Pin shaft hole, 6, support base, 7, hanging ring, 8, play card holder, 8-1, the 3rd pin shaft hole, 8-2, holding tank, the 9, second bearing pin, 10, the
One bearing pin, 11, thimble, 12, straight pin, 13, torsion spring, 14, lower positioning seat, 15, studs, 16, back-moving spring, 17, upper fixed
Position seat, 18, outer tube, 19, seat ring.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further details to the utility model：
Referring to Fig. 3 to Fig. 8, a kind of two-tube drilling tool detent mechanism, including double-strand chain bullet card component, thimble positioning component and bullet
Spring reset assembly；The double-strand chain bullet card component is provided with bullet card 1, torsion spring 13, the first bearing pin 10, supporting plate 5, the second bearing pin 9, bullet
Card holder 8, adapter coupling 3 and bullet card room 4；The bullet card holder 8 is arranged in bullet card room 4, and holding tank 8-2 is provided with card holder 8 is played,
The bullet card 1, supporting plate 5 are arranged in the holding tank 8-2 for playing card holder 8, and bullet card 1, supporting plate 5 include symmetrical two
Point, the rotary hole 1-1 set in its each section on bullet card 1 and the gap of the first bearing pin 10 coordinate assembling, the supporting plate 5
Provided with escape groove 5-2, the second pin shaft hole 5-3 coordinated with the gap of the second bearing pin 9 that rotary space is provided for bullet card, described first
Bearing pin 10, the second bearing pin 9 are elastic latch structure, and the both ends of the first bearing pin 10 are with being arranged on supporting plate 5 escape groove 5-2, two side walls
On the first pin shaft hole 5-1 interference fits, the both ends of the second bearing pin 9 with play card holder 8 on the 3rd pin shaft hole 8-1 interference
Coordinate assembling, torsion spring hole 1-2 is additionally provided with the bullet card 1, the both ends of torsion spring 13 are separately fixed at the torsion of the two bullet cards 1 in left and right
In the 1-2 of spring hole, the adapter coupling 3 is arranged on the top of bullet card room 4, and the bullet card room 4 is arranged in the upper of two-tube drilling tool outer tube 18
End；The thimble positioning component, spring reset component and double-strand chain bullet card component are equipped with.
Referring to Fig. 3, in two-tube drilling tool detent mechanism described in the utility model, the thimble positioning component is used for non-solution
Supporting plate 5 is positioned during card-like state, thimble positioning component includes thimble 11, straight pin 12 and recovery tube 2, the upper end of thimble 11
It is sleeved on gap fiting mode on straight pin 12, the lower end of thimble 11 is inlaid in the supporting plate 5 or so two of double-strand chain bullet card component
Partial centre, the recovery tube 2 are made up of upper recovery tube 2-1 and lower recovery tube 2-2, the upper recovery tube 2-1 and lower recovery
Pipe 2-2 is connected through a screw thread mode and connected, and the both ends of straight pin 12 are fixed in lower recovery tube 2-2 side wall.
Referring to Fig. 3, in two-tube drilling tool detent mechanism described in the utility model, the spring reset component is used for non-solution
The card-like state time limit fixs recovery tube 2-2 and is provided with upper positioning seat 17 with playing the relative position of card holder 8, spring reset component, resets bullet
Spring 16, lower positioning seat 14 and studs 15, the lower positioning seat 14 engage installed in upper recovery tube 2-1 with lower recovery tube 2-2
Position, the lower end of studs 15 are connected through lower positioning seat 14 with playing the upper end of card holder 8, positioning seat on the upper end of studs 15
17 connections, studs 15 with upper positioning seat 17, play card holder 8 junction and be provided with locking nut, the back-moving spring 16 and
Studs 15 is set with, between upper positioning seat 17 and lower positioning seat 14.
Referring to Fig. 9, Figure 10, Figure 11, two-tube drilling tool detent mechanism described in the utility model, occur in core drill inner tube
During stifled heart phenomenon, bullet card 1 and the bottom surface of adapter coupling 3 are in dieback state, bullet card 1, adapter coupling 3, bullet card room 4, supporting plate 5 and
Play card holder 8 and form rigid structure (as shown in Figure 9)；Now decentralization fisher fishes for inner tube, moves up recovery tube 2, passes through
Straight pin 12 drives thimble 11 to be moved upwards up to specified location, releases position constraint of the thimble lower end to two supporting plates 5 in left and right
Effect, discharge the revolution free degree of supporting plate, realize supporting plate 5 to internal rotation, at the same band move card 1 the centre of gyration it is downward,
To internal rotation, so as to discharge enough spaces, neutralizing bullet card 1 and the rigid structure occurred after the bottom surface dieback of adapter coupling 3, under
Under recovery tube 2-2 thrust, bullet card 1 separates (as shown in Figure 10) with adapter coupling 3；Recovery tube 2 continues to move up, by bullet card
1 is pushed into inside drilling tool, recovery and the unfreezing of bullet card is realized, so as to ensure that being smoothed out for inner tube fishing.
Referring to Figure 12, two-tube drilling tool detent mechanism described in the utility model, there is stifled heart phenomenon in core drill inner tube
When, bullet card 1 is in dieback state, bullet card 1, adapter coupling 3, bullet card room 4, supporting plate 5 and bullet card holder 8 with the bottom surface of adapter coupling 3
Rigid structure is formed, now the bottom of bullet card 1 contacts with the escape groove 5-2 bottoms of supporting plate 5, and the bottom of supporting plate 5 connects with support base 6
Touch, the pressure F that adapter coupling 3 applies to bullet card 1 passes to supporting plate 5, is decomposed into the pressure N1 of thimble 11 and to support base 6
Pressure N2, due to the pressure at both sides N1 of thimble 11 it is equal in magnitude, it is in opposite direction, the two cancel out each other, thimble 11 is put down in stress
Weighing apparatus state, the pressure N2 acted on support base 6 are delivered to hole through playing hanging ring 7, seat ring 19, the outer tube 18 of card holder 8 and drilling tool
Bottom, in this case, straight pin 12, the first bearing pin 10, the second bearing pin 9 are in the state of not stressing, and avoid because bearing pin is broken
The drilling failure of initiation, so as to substantially increase the reliability of two-tube drilling tool detent mechanism.
Claims (8)
- A kind of 1. two-tube drilling tool detent mechanism, it is characterised in that：The two-tube drilling tool detent mechanism include double-strand chain bullet card component, Thimble positioning component and spring reset component；The double-strand chain bullet card component is provided with bullet card (1), torsion spring (13), the first bearing pin (10), supporting plate (5), the second bearing pin (9), bullet card holder (8), adapter coupling (3) and bullet card room (4)；Bullet card holder (8) arrangement In bullet card room (4), holding tank (8-2) is provided with card holder (8) is played, the bullet card (1), supporting plate (5) are arranged in bullet card holder (8) in holding tank (8-2), bullet card (1), supporting plate (5) include symmetrical two parts, in its each section, bullet The rotary hole (1-1) set on card (1) coordinates with the first bearing pin (10) gap to be assembled, and the supporting plate (5) is provided with to be carried for bullet card For the escape groove (5-2) of rotary space, the first bearing pin (10) both ends are fixed in two side walls of escape groove (5-2), described Supporting plate (5) is additionally provided with the second pin shaft hole (5-3) coordinated with the second bearing pin (9) gap, and the second bearing pin (9) both ends are fixed In holding tank (8-2) side wall for playing card holder (8), the torsion spring (13) connects the bullet card (1) of left and right two, the bullet card Stopper (3) is arranged on above bullet card room (4), and the bullet card room (4) is arranged in the upper end of two-tube drilling tool outer tube (18)；The thimble Positioning component, spring reset component and double-strand chain bullet card component are equipped with.
- 2. two-tube drilling tool detent mechanism according to claim 1, it is characterised in that：The thimble positioning component includes thimble (11), straight pin (12) and recovery tube (2), thimble (11) upper end are sleeved on straight pin (12) with gap fiting mode, Thimble (11) lower end is inlaid in supporting plate (5) two-part centre in left and right of double-strand chain bullet card component, and the recovery tube (2) is by upper Recovery tube (2-1) and lower recovery tube (2-2) composition, straight pin (12) both ends are fixed in lower recovery tube (2-2) side wall.
- 3. two-tube drilling tool detent mechanism according to claim 2, it is characterised in that：It is upper fixed that the spring reset component is provided with Position seat (17), back-moving spring (16), lower positioning seat (14) and studs (15), the lower positioning seat (14) are arranged on upper recovery (2-1) and lower recovery tube (2-2) junction are managed, studs (15) lower end is through lower positioning seat (14) with playing card holder (8) upper end connects, and positioning seat (17) connection on studs (15) upper end, the back-moving spring (16) covers with studs (15) Dress, between upper positioning seat (17) and lower positioning seat (14).
- 4. two-tube drilling tool detent mechanism according to claim 3, it is characterised in that：The double-strand chain bullet card component is additionally provided with Support base (6), the support base (6) are located at below supporting plate (5), are fixedly mounted on and play in card holder (8).
- 5. two-tube drilling tool detent mechanism according to claim 4, it is characterised in that：First bearing pin (10), the second pin Axle (9) is elastic latch structure；First bearing pin (10) both ends are with being arranged on two side walls of supporting plate (5) escape groove (5-2) On the first pin shaft hole (5-1) interference fit；Second bearing pin (9) both ends are with playing the 3rd pin shaft hole in card holder (8) (8-1) interference fit.
- 6. two-tube drilling tool detent mechanism according to claim 5, it is characterised in that：The bullet card (1) is provided with torsion spring hole (1- 2), bullet card (1) is connected by the torsion spring hole (1-2) with torsion spring (13) one end.
- 7. two-tube drilling tool detent mechanism according to claim 6, it is characterised in that：The upper recovery tube (2-1) with next time Closed tube (2-2) mode of being connected through a screw thread connects.
- 8. two-tube drilling tool detent mechanism according to claim 7, it is characterised in that：The studs (15) with it is upper fixed Position seat (17), bullet card holder (8) junction are provided with locking nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720181996.XU CN206647083U (en) | 2017-02-28 | 2017-02-28 | A kind of two-tube drilling tool detent mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720181996.XU CN206647083U (en) | 2017-02-28 | 2017-02-28 | A kind of two-tube drilling tool detent mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206647083U true CN206647083U (en) | 2017-11-17 |
Family
ID=60280876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720181996.XU Expired - Fee Related CN206647083U (en) | 2017-02-28 | 2017-02-28 | A kind of two-tube drilling tool detent mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206647083U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106884626A (en) * | 2017-02-28 | 2017-06-23 | 中国地质科学院勘探技术研究所 | A kind of two-tube drilling tool detent mechanism of anti-dieback formula |
| CN111706280A (en) * | 2020-06-17 | 2020-09-25 | 中国地质科学院勘探技术研究所 | Elastic clamp positioning mechanism for inner pipe assembly of rope coring drilling tool |
-
2017
- 2017-02-28 CN CN201720181996.XU patent/CN206647083U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106884626A (en) * | 2017-02-28 | 2017-06-23 | 中国地质科学院勘探技术研究所 | A kind of two-tube drilling tool detent mechanism of anti-dieback formula |
| CN111706280A (en) * | 2020-06-17 | 2020-09-25 | 中国地质科学院勘探技术研究所 | Elastic clamp positioning mechanism for inner pipe assembly of rope coring drilling tool |
| CN111706280B (en) * | 2020-06-17 | 2021-12-10 | 中国地质科学院勘探技术研究所 | Elastic clamp positioning mechanism for inner pipe assembly of rope coring drilling tool |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106761513B (en) | A kind of rope salvaging type coring drilling with keep up pressure drilling tool | |
| CN108518191B (en) | Natural gas hydrate pressure maintaining coring device | |
| EP3640427A1 (en) | Drilling process of pressure-preserving cable core drilling machine for subsea natural gas hydrates | |
| CN106884626A (en) | A kind of two-tube drilling tool detent mechanism of anti-dieback formula | |
| CN102305022B (en) | Salvage-type casing pipe drilling tool for drilling | |
| CN108360994B (en) | Impact rotary type natural gas hydrate hole bottom freezing rope coring drilling tool and method | |
| CN102619484A (en) | Well wall coring while drilling tool | |
| CN201723190U (en) | Unconsolidated deposit hydraulic pressure type sealed coring tool | |
| CN107288565A (en) | A kind of sea bed gas hydrate rock core coring drilling with keep up pressure drilling tool | |
| CN108561083A (en) | Long range borehole fracturing integration apparatus and method under a kind of mine | |
| CN203412537U (en) | Rope-core recovery drilling tool | |
| CN102134976A (en) | Tunnel drilling hydraulic power reverse-circulation dual-walled drilling tool | |
| CN206647083U (en) | A kind of two-tube drilling tool detent mechanism | |
| CN208934628U (en) | A kind of rope salvaging type pitching, which builds the pressure, forces core drill | |
| CN102296950A (en) | Hydraulic shearing type sampling drilling tool | |
| CN101122220A (en) | Swelling type screen pipe suspension method and swelling type screen pipe hanger | |
| CN205012953U (en) | Drill bit of rotary drilling rig | |
| CN206888940U (en) | A kind of reacting cycle double wall drill tool for rotary drilling rig equipment | |
| CN208934631U (en) | A kind of more piece hinge type bullet card positioning mechanism of cord coring drill | |
| CN102235153A (en) | Method for directionally drilling inclined hole in steeply-inclined stratum | |
| CN105649563B (en) | Application of the steel strand wires during multi-angle boring coring | |
| CN105604514B (en) | A kind of bottom sediment cord coring drill suitable for seabed drilling machine | |
| CN202611639U (en) | Tool for coring along with drilling well wall | |
| CN2761803Y (en) | Impact rotating single-tube follow up drill tool | |
| CN208330212U (en) | A kind of CBM Drilling casing programme |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171117 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |