CN110029934A - Double speed PDC drill bit based on screw drive - Google Patents
Double speed PDC drill bit based on screw drive Download PDFInfo
- Publication number
- CN110029934A CN110029934A CN201910329999.7A CN201910329999A CN110029934A CN 110029934 A CN110029934 A CN 110029934A CN 201910329999 A CN201910329999 A CN 201910329999A CN 110029934 A CN110029934 A CN 110029934A
- Authority
- CN
- China
- Prior art keywords
- drill bit
- extension
- screw motor
- big
- flow guiding
- 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.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
- E21B10/5676—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a cutting face with different segments, e.g. mosaic-type inserts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
- E21B10/573—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
Abstract
The invention discloses a kind of double speed PDC drill bit based on screw drive mainly includes anti-lost top connection, anti-lost nut, screw motor stator, screw motor rotor, screw motor shell, universal shaft, the big drill bit of extension, y-shaped ring, flow guiding connector, the small drill bit in center, small bit nozzle etc.；Assemble sequence is first to assemble screw motor assembly part and universal shaft assembly part, and two parts are fitted together, and assembles flow guiding connector, dresses up global facility；Y-shaped ring and the big bit nozzle of extension are loaded onto the big drill bit of extension, assembles the big drill bit of extension；It is assemblied on flow guiding connector after loading onto small bit nozzle to the small drill bit in center, assembles anti-lost top connection, anti-lost nut, assembly is completed.The present invention drives screw motor by cleaner for high-pressure drilling fluid, and then drives the small drill bit in center, has the characteristics that the small drill bit in center is crept into from the big drill bit of extension with different revolving speeds, can effectively improve rate of penetration.
Description
Technical field
The invention belongs to oil and natural gas to exploit field, and in particular to a kind of double speed PDC drill bit based on screw drive
Design.
Background technique
With deepening continuously for Oil And Gas Exploration And Development, deep-well, ultradeep well and Novel oil gas resource well are more and more,
Bore a possibility that meeting " three high stratum " (formation hardness is high, rock drillability is high, rock abrasiveness is high) increasing, tradition
For PDC drill bit during well drilling and rock crushing, low center portion efficiency of breaking rock is a key factor for restricting rate of penetration.Center portion broken rock effect
The main reason for rate is low is that rock break-off process wellbore center portion cutting tooth movement velocity is low, causes drilling process drill bit center portion by rock
"top" is lived, and rock practical broken form in wellbore center is to break disconnected, rather than the impact grinding of rock bit or PDC drill bit are cut
Cut broken rock.This has seriously affected the rate of penetration and cost of exploration & development of deep hard formation.Rate of penetration and service life are weighing apparatuses
Two important indicators of bit performance are measured, the critical issue that rate of penetration is always drilling engineering is improved.Guaranteeing certain use
Under the premise of service life, improving rate of penetration reduces producing cost with weight for increasing drill bit total footage, reducing the number that makes a trip
Want meaning.For the low problem of rate of penetration in the hard formation drilling process of deep, the double speed PDC of the invention based on screw drive
Drill bit can be first crushed the rock at center using the screw motor driving small drill bit in center, while drive extension wammel using drill string
Head fast drilling, it is effective to improve drillng operation efficiency.
Summary of the invention
When the purpose of the present invention is to solve boring chance " three high stratum " in background technique, center portion efficiency of breaking rock is low to lead to machine
The not high problem of tool drilling speed proposes a kind of double speed PDC drill bit based on screw drive.
The technical scheme is that the double speed PDC drill bit based on screw drive, by anti-lost top connection, anti-lost nut, spiral shell
Bar motor stator, screw motor rotor, screw motor shell, hinge a living, universal shaft, the big drill bit of extension, hinge b living, y-shaped ring,
Flow guiding connector, the small drill bit in center, small bit nozzle, the big nozzle composition of extension drill bit；It is characterized in that: assemble sequence is first by screw rod
Motor stator is packed into screw motor shell, loads onto hinge a living in screw motor rotor lower end, screw motor rotor is packed into screw rod horse
Up to stator, universal shaft is loaded onto the hinge lower end a living, hinge b living is assembled, assembles flow guiding connector, dress up global facility；In extension wammel head
Groove is packed into y-shaped ring, loads onto the big nozzle of extension drill bit to the big drill bit of extension, and it is big that the global facility of front is packed into extension
Drill bit is connected through a screw thread screw motor shell and the big drill bit of extension, loads onto small bit nozzle to the small drill bit in center, passes through water conservancy diversion
Connector connects the small drill bit in center, the anti-lost top connection of assembly is connected through a screw thread, in the anti-lost spiral shell of screw motor stator upper end fit on
Mother, assembly are completed.
The double speed PDC drill bit based on screw drive in above scheme, it is characterised in that: be provided on flow guiding connector circumferential equal
Three inclined holes of cloth, drilling fluid enter flow guiding connector by inclined hole from the annular space between the big drill bit of extension and flow guiding connector, thus
Into the small drill bit in center, creeps into Shi Cong little bit nozzle and spray, inclined hole advantageously reduces the pressure drop of drilling fluid.
The double speed PDC drill bit based on screw drive in above scheme, it is characterised in that: be provided among the big drill bit of extension logical
Hole, so that flow guiding connector can pass through the big drill bit of extension and connect the small drill bit in center, through-hole interior design has assembly y-shaped ring
Two grooves.
The double speed PDC drill bit based on screw drive in above scheme, it is characterised in that: the big drill bit of extension and flow guiding connector
Between design there are two y-shaped ring；The opening directions of two y-shaped rings is on the contrary, above upward, below downward；It rises
To good sealing function, it can flow out or flow between the big drill bit of extension and flow guiding connector to avoid drilling fluid.
The double speed PDC drill bit based on screw drive in above scheme, it is characterised in that: screw motor rotor (4) upper end
Design has anti-lost nut；During drillng operation makes a trip, screw motor rotor, hinge a living, universal shaft, hinge b, water conservancy diversion living are prevented
Connector, the small drill bit in center integrally move down.
The double speed PDC drill bit based on screw drive in above scheme, it is characterised in that: screw motor rotor connects with water conservancy diversion
Design has universal shaft between head；The motion profile of screw motor rotor is planetary motion, and the center that flow guiding connector is connected to is small
Drill bit only needs pure rotation；The universal shaft of design can convert pure rotation for the planetary motion of screw motor rotor.
The beneficial effects of the present invention are: (1) this double speed PDC drill bit structure based on screw drive is compact to design rationally；(2)
The function of the small drill bit in center and the big drill bit double speed drilling of extension may be implemented；(3) it can effectively improve rate of penetration, improve drilling well
Operating efficiency.
Detailed description of the invention
Fig. 1 show the structural schematic diagram of the double speed PDC drill bit the present invention is based on screw drive.
Fig. 2 show the drill bit three-dimensional front-view in Fig. 1 of the present invention.
Fig. 3 show the universal shaft structure schematic diagram in Fig. 1 of the present invention.
Fig. 4 show the three-dimensional installation diagram of Fig. 1 of the present invention.
Description of symbols: 1. anti-lost top connections, 2. anti-lost nuts, 3. screw motor stators, 4. screw motor rotors, 5.
Screw motor shell, 6. hinge a living, 7. universal shafts, the big drill bit of 8. extensions, 9. hinge b living, 10.Y shape sealing ring, 11. flow guiding connectors,
12. the small drill bit in center, 13. small bit nozzles, the 14. big nozzles of extension drill bit.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
Shown in reference to the accompanying drawings, the double speed PDC drill bit based on screw drive, by anti-lost top connection (1), anti-lost nut (2),
Screw motor stator (3), screw motor rotor (4), screw motor shell (5), hinge a (6) living, universal shaft (7), the big drill bit of extension
(8), hinge b (9) living, y-shaped ring (10), flow guiding connector (11), the small drill bit in center (12), small bit nozzle (13), extension are bored
Big nozzle (14) composition of head；It is characterized in that: assemble sequence is that screw motor stator (3) are first packed into screw motor shell (5),
Hinge a (6) living is loaded onto screw motor rotor lower end, and screw motor rotor (4) are packed into screw motor stator (3), cuts with scissors a (6) living
Lower end is loaded onto universal shaft (7), is assembled hinge b (9) living, is assembled flow guiding connector (11), dress up global facility；In extension wammel head (8)
Groove is packed into y-shaped ring (10), the big nozzle of extension drill bit (14) is loaded onto the big drill bit of extension (8), by the whole portion of front
Part is packed into the big drill bit of extension (8), is connected through a screw thread screw motor shell (5) and the big drill bit of extension (8), gives the small drill bit in center
(12) small bit nozzle (13) are loaded onto, the small drill bit in center (12) is connected by flow guiding connector (11), it is anti-to be connected through a screw thread assembly
Fall top connection (1), in screw motor stator (3) the anti-lost nut of upper end fit on (2), assembly is completed.
The double speed PDC drill bit course of work based on screw drive: anti-lost top connection (1) upper end connects drill string, drill string rotating
While driving the big drill bit of extension (8) rotate broken rock；Cleaner for high-pressure drilling fluid is squeezed into inside drill string, drilling fluid based on screw rod by driving
The anti-lost top connection (1) of dynamic double speed PDC drill bit, driving screw motor rotor (4) rotation, driving screw motor rotor (4) according to
It is secondary to be connected to live hinge a (6), universal shaft (7), hinge b (9), flow guiding connector (11), the small drill bit in center (12) living, finally drive center
Small drill bit (12) rotates broken rock；Drilling fluid flows through screw motor stator (3), into the big drill bit of extension (8) and flow guiding connector (11)
Between annular space, partially ejected from the big nozzle of extension drill bit (14), another part by flow guiding connector (11) enter center
Small drill bit (12), ejects from small bit nozzle (13), so that bottom-hole cleaning, is carried out landwaste out of pit shaft, is bored
Well operations.
It is provided with circumferential three uniformly distributed inclined holes on flow guiding connector (11) in above scheme, drilling fluid is from the big drill bit of extension
(8) annular space between flow guiding connector (11) enters flow guiding connector (11) by inclined hole, hence into the small drill bit in center (12),
Drilling Shi Cong little bit nozzle (13) ejects, and inclined hole advantageously reduces the pressure drop of drilling fluid.
It is provided with through-hole among the big drill bit of extension (8) in above scheme, so that flow guiding connector (11) can pass through extension
Big drill bit (8) the connection small drill bit in center (12), through-hole interior design have two grooves of assembly y-shaped ring (10).
Screw motor rotor (4) upper end design in above scheme has anti-lost nut (2)；Drillng operation makes a trip process
In, it prevents by screw motor rotor (4), hinge a (6) living, universal shaft (7), hinge b (9), flow guiding connector (11), the small drill bit in center living
(12) internal drive feature formed, integrally moves down.
Double speed PDC drill bit based on screw drive, design has ten thousand between screw motor rotor (4) and flow guiding connector (11)
To axis (7)；The motion profile of screw motor rotor (4) is planetary motion, and the small drill bit in center that flow guiding connector (11) is connected to
(12) pure rotation is only needed；The universal shaft (7) of design can convert pure rotation for the planetary motion of screw motor rotor (4).
Double speed PDC drill bit based on screw drive, between the big drill bit of extension (8) and flow guiding connector (11) there are two designs
Y-shaped ring (10), the opening directions of two y-shaped rings (10) is on the contrary, above upward, below downward；It plays good
Sealing effect, can flow out or flow between the big drill bit of extension (8) and flow guiding connector (11) to avoid drilling fluid.
The double speed PDC drill bit based on screw drive in above scheme, assemble sequence are as follows: first fill screw motor stator 3
Enter screw motor shell 5, loads onto hinge a6 living in screw motor rotor lower end, screw motor rotor 4 is packed into screw motor stator
3, universal shaft 7 is loaded onto the hinge lower end a6 living, hinge b9 living is assembled, assembles flow guiding connector 11, dress up global facility；In extension wammel head
8 grooves are packed into y-shaped ring 10, load onto the big nozzle 14 of extension drill bit to the big drill bit 8 of extension, and the global facility of front is packed into
The big drill bit 8 of extension is connected through a screw thread screw motor shell 5 and the big drill bit 8 of extension, loads onto small drill bit to the small drill bit 12 in center and sprays
Mouth 13 connects the small drill bit 12 in center by flow guiding connector 11, is connected through a screw thread the anti-lost top connection 1 of assembly, fixed in screw motor
The anti-lost nut 2 of sub 3 upper end fit ons, assembly are completed.
Claims (6)
1. the double speed PDC drill bit based on screw drive, by anti-lost top connection (1), anti-lost nut (2), screw motor stator
(3), screw motor rotor (4), screw motor shell (5), hinge a (6) living, universal shaft (7), the big drill bit of extension (8), hinge b living
(9), y-shaped ring (10), flow guiding connector (11), the small drill bit in center (12), small bit nozzle (13), the big nozzle of extension drill bit
(14) it forms；It is characterized in that: assemble sequence is that screw motor stator (3) are first packed into screw motor shell (5), in screw motor
Hinge a (6) living is loaded onto rotor lower end, and screw motor rotor (4) are packed into screw motor stator (3), loads onto hinge a (6) lower end living
Universal shaft (7) assembles hinge b (9) living, assembles flow guiding connector (11), dress up global facility；It is filled in extension wammel head (8) groove
Enter y-shaped ring (10), load onto the big nozzle of extension drill bit (14) to the big drill bit of extension (8), the global facility of front is packed into outer
Prolong big drill bit (8), be connected through a screw thread screw motor shell (5) and the big drill bit of extension (8), is loaded onto the small drill bit in center (12) small
Bit nozzle (13) connects the small drill bit in center (12) by flow guiding connector (11), is connected through a screw thread the anti-lost top connection of assembly
(1), in screw motor stator (3) the anti-lost nut of upper end fit on (2), assembly is completed.
2. the double speed PDC drill bit according to claim 1 based on screw drive, it is characterised in that: on flow guiding connector (11)
Three circumferentially uniformly distributed inclined holes are provided with, annular space of the drilling fluid between the big drill bit of extension (8) and flow guiding connector (11) passes through inclined hole
It creeps into Shi Cong little bit nozzle (13) hence into the small drill bit in center (12) into flow guiding connector (11) and sprays, inclined hole is conducive to
Reduce the pressure drop of drilling fluid.
3. the double speed PDC drill bit according to claim 1 based on screw drive, it is characterised in that: in the big drill bit of extension (8)
Between be provided with through-hole so that flow guiding connector (11) can pass through the big drill bit of extension (8) the connection small drill bit in center (12), inside through-hole
Design has two grooves of assembly y-shaped ring (10).
4. the double speed PDC drill bit according to claim 1 based on screw drive, it is characterised in that: the big drill bit of extension (8) with
There are two y-shaped ring (10) for design between flow guiding connector (11)；The opening direction of two y-shaped rings (10) is on the contrary, above
Upward, below downward；Good sealing function is played, it can be to avoid drilling fluid from the big drill bit of extension (8) and flow guiding connector
(11) it flows out or flows between.
5. the double speed PDC drill bit according to claim 1 based on screw drive, it is characterised in that: screw motor rotor (4)
Upper end design has anti-lost nut (2)；During drillng operation makes a trip, screw motor rotor (4), hinge a (6) living, universal is prevented
Axis (7), hinge b (9) living, flow guiding connector (11), the small drill bit in center (12) integrally move down.
6. the double speed PDC drill bit according to claim 1 based on screw drive, it is characterised in that: screw motor rotor (4)
Design has universal shaft (7) between flow guiding connector (11)；The motion profile of screw motor rotor (4) is planetary motion, and water conservancy diversion
The small drill bit in center (12) that connector (11) is connected to only needs pure rotation；The universal shaft (7) of design can be by screw motor rotor
(4) planetary motion is converted into pure rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329999.7A CN110029934A (en) | 2019-04-23 | 2019-04-23 | Double speed PDC drill bit based on screw drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329999.7A CN110029934A (en) | 2019-04-23 | 2019-04-23 | Double speed PDC drill bit based on screw drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110029934A true CN110029934A (en) | 2019-07-19 |
Family
ID=67239895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910329999.7A Withdrawn CN110029934A (en) | 2019-04-23 | 2019-04-23 | Double speed PDC drill bit based on screw drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110029934A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111058761A (en) * | 2019-12-31 | 2020-04-24 | 中国石油集团川庆钻探工程有限公司 | Manufacturing method of double-speed double-center drilling speed-increasing equipment |
| CN111852321A (en) * | 2020-06-23 | 2020-10-30 | 西安通源正合石油工程有限公司 | Screw rod acceleration tool for unconventional oil gas ultra-high temperature drilling |
| CN111021946B (en) * | 2019-12-31 | 2022-03-18 | 中国石油集团川庆钻探工程有限公司 | Well drilling speed-increasing process for changing bottom hole confining pressure distribution by middle energy accumulation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561951A (en) * | 2012-01-14 | 2012-07-11 | 中国石油天然气集团公司 | Double-stage and double-speed well drilling tool |
| CN105221068A (en) * | 2015-11-10 | 2016-01-06 | 西南石油大学 | Percussion is utilized to improve the New Type of PDC Bit of heart portion efficiency of breaking rock |
| CN206000453U (en) * | 2016-09-08 | 2017-03-08 | 中国石油天然气集团公司 | A kind of twin-stage double-speed well drilling tool |
| CN106593307A (en) * | 2017-01-21 | 2017-04-26 | 刘伟 | Dynamic-static type double-stage PDC drill bit |
| CN107386960A (en) * | 2017-08-04 | 2017-11-24 | 四川深远石油钻井工具股份有限公司 | A kind of drilling speed device with composite drill bit |
| CN107842317A (en) * | 2017-11-27 | 2018-03-27 | 中煤科工集团西安研究院有限公司 | Hard-rock boring punching composite drill bit |
| CN207660547U (en) * | 2017-11-13 | 2018-07-27 | 中石化石油工程技术服务有限公司 | Speed-raising increases longevity two-stage PDC bit and twin-stage PDC reamers |
-
2019
- 2019-04-23 CN CN201910329999.7A patent/CN110029934A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561951A (en) * | 2012-01-14 | 2012-07-11 | 中国石油天然气集团公司 | Double-stage and double-speed well drilling tool |
| CN105221068A (en) * | 2015-11-10 | 2016-01-06 | 西南石油大学 | Percussion is utilized to improve the New Type of PDC Bit of heart portion efficiency of breaking rock |
| CN206000453U (en) * | 2016-09-08 | 2017-03-08 | 中国石油天然气集团公司 | A kind of twin-stage double-speed well drilling tool |
| CN106593307A (en) * | 2017-01-21 | 2017-04-26 | 刘伟 | Dynamic-static type double-stage PDC drill bit |
| CN107386960A (en) * | 2017-08-04 | 2017-11-24 | 四川深远石油钻井工具股份有限公司 | A kind of drilling speed device with composite drill bit |
| CN207660547U (en) * | 2017-11-13 | 2018-07-27 | 中石化石油工程技术服务有限公司 | Speed-raising increases longevity two-stage PDC bit and twin-stage PDC reamers |
| CN107842317A (en) * | 2017-11-27 | 2018-03-27 | 中煤科工集团西安研究院有限公司 | Hard-rock boring punching composite drill bit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111058761A (en) * | 2019-12-31 | 2020-04-24 | 中国石油集团川庆钻探工程有限公司 | Manufacturing method of double-speed double-center drilling speed-increasing equipment |
| CN111021946B (en) * | 2019-12-31 | 2022-03-18 | 中国石油集团川庆钻探工程有限公司 | Well drilling speed-increasing process for changing bottom hole confining pressure distribution by middle energy accumulation |
| CN111852321A (en) * | 2020-06-23 | 2020-10-30 | 西安通源正合石油工程有限公司 | Screw rod acceleration tool for unconventional oil gas ultra-high temperature drilling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2016150113A1 (en) | Positive displacement motor drill and rock breaking well drilling method therefor | |
| CN103527097B (en) | Active adjustment type composite drill bit | |
| CN110029934A (en) | Double speed PDC drill bit based on screw drive | |
| CN107386960B (en) | Drilling speed-increasing device with composite drill bit | |
| CN103628815B (en) | A kind of nearly drill bit reverses, Oscillatory Coupling impactor | |
| CN112483005B (en) | Rock breaking drill bit for underground drilling tool | |
| CN102561951A (en) | Double-stage and double-speed well drilling tool | |
| CN106223832A (en) | composite impact drilling tool | |
| CN110029933A (en) | Based on turbo-driven double speed PDC drill bit | |
| CN108756733A (en) | A kind of pulsatile impact broken rock drill bit | |
| CN101988377B (en) | Energy storage type salvageable underground hydraulic impulse tool | |
| CN111219147B (en) | Petroleum drilling speed-up equipment | |
| CN106837181A (en) | A kind of drilling well knob drill hammer | |
| CN105525868B (en) | A kind of pulsating double direction impulse device | |
| CN205778560U (en) | It is bit Integrated that centering type hydraulic bores expansion | |
| CN110043193A (en) | Split type single cone PDC composite drill bit | |
| CN109989707A (en) | Based on the motor-driven double speed PDC drill bit of turbine generation formula | |
| CN111894464B (en) | PDC and single-cone compounded inner chip removal drill bit | |
| CN206458314U (en) | Underground double acting accelerator | |
| CN202073498U (en) | Chambering type pressure-reduction acceleration drill bit | |
| CN205154007U (en) | Screw drilling tool | |
| CN207332752U (en) | A kind of drilling speed device | |
| CN207092947U (en) | A kind of drilling speed device with composite drill bit | |
| CN207048680U (en) | Reaming while drilling drill bit | |
| CN203685022U (en) | Liquid-operated impactor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190719 |