CN105507821A - Buffer energy storage device for protecting downhole screw drill tool and drill bit combinations - Google Patents
Buffer energy storage device for protecting downhole screw drill tool and drill bit combinations Download PDFInfo
- Publication number
- CN105507821A CN105507821A CN201510867447.3A CN201510867447A CN105507821A CN 105507821 A CN105507821 A CN 105507821A CN 201510867447 A CN201510867447 A CN 201510867447A CN 105507821 A CN105507821 A CN 105507821A
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- China
- Prior art keywords
- energy storage
- accumulation
- main shaft
- locking nut
- drill bit
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- 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
- E21B12/00—Accessories for drilling tools
Abstract
The invention discloses a buffer energy storage device for protecting downhole screw drill tool and drill bit combinations. The buffer energy storage device at least comprises a spindle, an energy storage assembly and a shell. The shell sleeves the spindle and is limited by an upper locking nuts and a shell locking nut, the upper locking nut is mounted at the upper end of the spindle, the shell locking nut is positioned at the lower end of the spindle, a transmission buffer cavity is formed by gaps between the shell and the spindle, the energy storage assembly is mounted in the transmission buffer cavity and comprises an energy storage nipple, a push cushion and an elastic buffer component, the energy storage nipple is in key connection with the spindle, and the lower end of the energy storage nipple is protruded at the lower end of the spindle. The buffer energy storage device has the advantages that drill pressures born by drill bits can be adjusted by the aid of the energy storage nipple, vibration can be reduced, the buffer energy storage device has an excellent torque transmission function and can be used as transmission portions of downhole power motors, accordingly, screw drill tools and the drill bits can be prevented from being damaged during churn drill, and certain buffer and protection effects can be realized for the screw drill tools and the drill bits; the distance from centralizers of the downhole power motors to the drill bits can be effectively shortened, and accordingly the angle building hole rates of the single-bend downhole power motors can be increased.
Description
Technical field
The present invention relates to a kind of device combined for the protection of down-hole helicoid hydraulic motor and drill bit, belong to oil drilling tool technical field.
Background technology
At present, along with the development of domestic and international drilling technology, bit speed improves a lot compared with in the past, but show from the information of situ of drilling well, in complex structural well, drill bit is usually because moment of torsion is large, and instability waits and occurs stall or runaway condition, causes bit wear to lose efficacy time serious; In addition, the phenomenon of percussion drill occurs in going down process often, cause drill bit to destroy, helicoid hydraulic motor is impaired, not only makes to be affected the application life of drill bit and helicoid hydraulic motor also directly to cause that drilling period is elongated, the cost of drilling well increases greatly.
In view of this, application number be 201110000167.4 Chinese invention patent " Anti-impact screw drill " disclose a kind of helicoid hydraulic motor with buffer, the lower end that power transmission shaft protrudes from housing is provided with cushion collar, the lower end of cushion collar is provided with the crossover sub for installing drill bit, spring is provided with between power transmission shaft and cushion collar, vibrations for being produced by drill bit are eliminated instantaneously, avoid the instrument of more than drill bit to be impacted; But protrude from the lower end of housing because buffer (cushion collar and spring) is installed on power transmission shaft, therefore buffer increases the length of power transmission shaft, limit the overall drilling speed of drilling tool, and the long risk increasing transmission shaft failure of propeller shaft length.
Summary of the invention
The object of the present invention is to provide that a kind of structure is simple, down-hole running is stable, safe and reliable, buffering energy storage equipment that the protection down-hole helicoid hydraulic motor of long service life and drill bit combine.
Realizing the technical scheme that the object of the invention adopts is, a kind of buffering energy storage equipment protecting down-hole helicoid hydraulic motor and drill bit combination, at least comprise main shaft, accumulation of energy assembly and the housing be placed on main shaft, described housing is spacing with the housing locking nut being positioned at main shaft lower end by the upper locking nut being installed on main shaft upper end, gap between housing and main shaft forms transmission cushion chamber, accumulation of energy assembly is installed in transmission cushion chamber, described accumulation of energy assembly comprises accumulation of energy pipe nipple, backup pad and resilient snubber, accumulation of energy pipe nipple and backup pad are placed on main shaft from bottom to up successively, the inner surface of accumulation of energy pipe nipple offers slideway, accumulation of energy pipe nipple is by being installed on key in slideway and being connected with main shaft and the lower end of accumulation of energy pipe nipple protruding from main shaft lower end, resilient snubber is fixed between backup pad tube wall and housing, the lower end of main shaft is provided with lower locking nut, accumulation of energy pipe nipple is locked by lower locking nut, described backup pad is flanged pipe, the upper end of resilient snubber is spacing by the position limiting structure that shell inner surface is arranged, lower end is spacing by the flange of backup pad, described accumulation of energy pipe nipple is the stepped straight tube of external surface, the flange of backup pad is spacing by the step A of accumulation of energy pipe nipple external surface.
Transmission component is provided with in transmission cushion chamber, described transmission component comprises journal bearing inner ring, upper journal bearing outer ring, lower radial bearing inner ring, the thrust bearings that leans nut and formed with up-thrust bearing by one, upper journal bearing outer ring and upper journal bearing inner ring are placed on main shaft from outside to inside successively, thrust bearings and lean nut from top to bottom order be installed on main shaft, the two ends of thrust bearings are respectively by upper journal bearing inner ring and to lean nut spacing.
Thrust bearings and lean between nut and be provided with shoulder cover, the upper end of shoulder cover pushes against the inner ring lower end of thrust bearings, and backup pad is positioned at and leans below nut.
Described housing comprises upper shell and lower house, the surface of upper shell and lower house is equipped with ledge structure, the upper end of upper shell is spacing by upper locking nut, lower end is spacing by the ledge structure of lower house external surface, the upper end of lower house is spacing by the lower surface of thrust bearings outer ring, lower end is spacing by housing locking nut, and housing locking nut is threaded with the inner surface of lower house lower end.
Housing locking nut is placed on the middle part of accumulation of energy pipe nipple, is provided with lower radial bearing inner ring between housing locking nut and accumulation of energy pipe nipple, the two ends of lower radial bearing inner ring respectively by the flange of backup pad and the step B of accumulation of energy pipe nipple external surface spacing.
The lower end of upper journal bearing outer ring is provided with flange, the flange of upper journal bearing outer ring is fixedly clamped between the ledge structure and the upper surface, outer ring of thrust bearings of upper shell inner surface, and the upper end of resilient snubber is spacing by the ledge structure of lower house inner surface.
Lower house is provided with near-bit stabilizer.
Be provided with adjustment spacer in transmission cushion chamber, adjustment spacer be placed on main shaft, adjustment spacer two ends respectively with the lower end, outer ring of thrust bearings and the upper end close contact of resilient snubber.
Screw thread on described housing locking nut external surface is left hand thread.
Described resilient snubber is spring shim.
As shown from the above technical solution, the buffering energy storage equipment of protection down-hole helicoid hydraulic motor provided by the invention and drill bit combination, the upper end of main shaft is threaded with articulated joint for screw drilling rod, the upper end of housing is connected with articulated joint for screw drilling rod outer casing screw, lower end is undertaken spacing by housing locking nut, the power screw drilling tool universal drive shaft that screw drilling tool motor produces is passed to main shaft, accumulation of energy pipe nipple is connected with main shaft key and is locked by lower locking nut, drill bit is installed on the lower end of accumulation of energy pipe nipple and is threaded with it, said structure can ensure the moment of torsion that this buffering energy storage equipment transmission is larger, housing is spacing with the housing locking nut being positioned at main shaft lower end by the upper locking nut being installed on main shaft upper end, ensures stable connection between housing and main shaft, gap between housing and main shaft forms transmission cushion chamber, accumulation of energy assembly is installed in transmission cushion chamber, transmission cushion chamber provides effective protection and the installation of accumulation of energy assembly does not change the length of main shaft for accumulation of energy assembly, makes this device can maintain preferably rate of penetration, described accumulation of energy assembly comprises accumulation of energy pipe nipple, backup pad and resilient snubber, accumulation of energy pipe nipple and backup pad are placed on main shaft from bottom to up successively, the lower end of accumulation of energy pipe nipple protrudes from main shaft lower end for connecting drill bit, lower locking nut pushes against accumulation of energy pipe nipple for carrying out axial limiting to accumulation of energy pipe nipple, improves the structural reliability of this accumulation of energy assembly, accumulation of energy pipe nipple is the stepped straight tube of external surface, backup pad is spacing by the step A (axis) of accumulation of energy pipe nipple external surface, backup pad adopts flanged pipe, resilient snubber is fixed between backup pad tube wall and housing, pushing away back cushion body is placed on main shaft, flange is used for carrying out axial limiting to resilient snubber, the upper end of resilient snubber is spacing by the position limiting structure that shell inner surface is arranged, when creeping into, accumulation of energy pipe nipple runs into the axial force of drill bit moment and moves up along slideway, promote backup pad to move up, thus elasticity of compression bolster, drill bit and helicoid hydraulic motor are played to the effect of bumper and absorbing shock, when drill bit is not subject to the effect of moment axial force, accumulation of energy pipe nipple sets back under the effect of resilient snubber.
For improving the shock resistance of device, transmission component is provided with in transmission cushion chamber, transmission component comprises journal bearing inner ring, upper journal bearing outer ring, lower radial bearing inner ring, lean nut and thrust bearings, upper journal bearing outer ring and upper journal bearing inner ring are placed on main shaft from outside to inside successively, bear radial load effect, thrust bearings and lean nut from top to bottom order be installed on main shaft, the two ends of thrust bearings are respectively by upper journal bearing inner ring and to lean nut spacing, bear the responsive to axial force from applying the pressure of the drill in drilling process, in drilling process, upper journal bearing outer ring, upper journal bearing inner ring and thrust bearings all pass through drilling fluid lubricating, thrust bearings and lean between nut and be provided with shoulder cover, the upper end of shoulder cover pushes against the inner ring lower end of thrust bearings, for locking thrust bearings, its position is fixed by adjustment spacer by the lower end, outer ring of thrust bearings.
Shell provided by the invention is made up of upper shell and lower house, shelling machine is two-part structure, increase self-strength, reduce difficulty of processing, the surface of upper shell and lower house is equipped with the ledge structure for axial limiting, wherein, the upper end of upper shell is spacing by upper locking nut, lower end is spacing by the ledge structure of lower house external surface, the upper end of lower house is spacing by the lower surface of thrust bearings outer ring, lower end is spacing by housing locking nut, housing locking nut is threaded with the inner surface of lower house lower end, be positioned at the ledge structure of upper shell inner surface for carrying out axial limiting to the upper end, outer ring of thrust bearings, the outer ring of the ledge structure and thrust bearings that are positioned at upper shell inner surface clamps the flange of journal bearing outer ring, the load scope of journal bearing outer ring in increase, the ledge structure of lower house inner surface is used for carrying out axial limiting to the upper end of resilient snubber, housing locking nut is connected by left hand thread screw thread with the inner surface of lower house lower end, left hand thread avoids housing locking nut to release at work phenomenon, ensure that housing and main shaft are stable to be connected, lower radial bearing inner ring is provided with between housing locking nut and accumulation of energy pipe nipple, the two ends of lower radial bearing inner ring respectively by the flange of backup pad and the step B of accumulation of energy pipe nipple external surface spacing, housing locking nut matches with lower radial bearing inner ring, assists and bears in drilling process the radial load effect put on device, be provided with adjustment spacer in transmission cushion chamber, its two ends respectively with the lower end, outer ring of thrust bearings and the upper end close contact of resilient snubber, for adjusting the interval between thrust bearings and resilient snubber, namely regulate the cushion stroke of accumulation of energy assembly.
In sum; the buffering energy storage equipment of protection down-hole helicoid hydraulic motor provided by the invention and drill bit combination; not only efficiently solve drill bit in drilling process with the situation to drill bit harmful vibration that arrives; the larger moment of torsion simultaneously also transmitted; this device directly can combine with well dynamic motor; be made into required down-hole protection drill bit and the buffering accumulation of energy helicoid hydraulic motor of helicoid hydraulic motor, this device can well solve the damage that in going down process, percussion drill causes helicoid hydraulic motor and drill bit.And according to the needs of drilling condition, near-bit stabilizer can be set on lower house, effectively like this shorten the distance of near-bit stabilizer to drill bit, improve the build angle rate of single curved well dynamic motor.This apparatus structure is simple, easy to use; Down-hole running is stable, safe and reliable, coordinates overall efficiency higher with well dynamic motor; the moment of torsion transmitted is large; high life, effectively can play the effect of damping, protection drill bit to the drill bit in work; and effectively can prevent from occurring in going down process the injury that percussion drill causes helicoid hydraulic motor; this device can adapt to various hard formation drilling condition, plays effective protective effect to helicoid hydraulic motor and drill bit, extends the application life of drill bit; shorten drilling period, reduce drilling cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the buffering energy storage equipment of protection down-hole helicoid hydraulic motor provided by the invention and drill bit combination.
Wherein, 1-main shaft, 2-upper locking nut, the upper journal bearing outer ring of 3-, the upper journal bearing inner ring of 4-, 5-upper shell, 6-thrust bearings, 7-shoulder cover, 8-adjusts spacer, and 9-leans nut, 10-lower house, 11-resilient snubber, 12-backup pad, 13-lower radial bearing inner ring, 14-housing locking nut, 15-accumulation of energy pipe nipple, 16-lower locking nut, 17-slideway, 18-step A, 19-step B, 20-key.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is illustrated in detail.
The buffering energy storage equipment of protection down-hole helicoid hydraulic motor provided by the invention and drill bit combination, its structure as shown in Figure 1, the housing comprising main shaft 1, accumulation of energy assembly, transmission component and be placed on main shaft, housing is spacing with the housing locking nut 14 being positioned at main shaft lower end by the upper locking nut 2 being installed on main shaft 1 upper end, gap between housing and main shaft forms transmission cushion chamber, transmission component and accumulation of energy assembly are installed in transmission cushion chamber, upper locking nut 2 is positioned at main shaft 1 topmost, ensures that other parts can not upwards play;
Described transmission component comprises journal bearing inner ring 3, upper journal bearing outer ring 4, lower radial bearing inner ring 13, leans nut 9, shoulder cover 7 and the thrust bearings 6 that formed with up-thrust bearing by one, upper journal bearing outer ring 4 is placed on main shaft 1 from outside to inside successively with upper journal bearing inner ring 3, bear radial load effect, thrust bearings 6, shoulder cover 7 and lean nut 9 from top to bottom order be installed on main shaft 1, the upper end of shoulder cover 7 pushes against the inner ring lower end of thrust bearings, and the two ends of thrust bearings are overlapped 7 spacing respectively by upper journal bearing inner ring 3 and shoulder;
Described accumulation of energy assembly comprises accumulation of energy pipe nipple 15, backup pad 12 and resilient snubber 11, accumulation of energy pipe nipple 15 and backup pad 12 are placed on main shaft 1 from bottom to up successively, the inner surface of accumulation of energy pipe nipple offers slideway 17, accumulation of energy pipe nipple is by being installed on key 20 in slideway 17 and being connected with main shaft 1 and the lower end of accumulation of energy pipe nipple protruding from main shaft lower end, drill bit is threaded with the lower end of accumulation of energy pipe nipple 15, resilient snubber 11 is fixed between backup pad 12 tube wall and housing, the preferred spring shim of resilient snubber, the lower end of main shaft 1 is provided with lower locking nut 16, accumulation of energy pipe nipple is locked by lower locking nut 16, described backup pad 12 is flanged pipe, backup pad 12 to be placed on main shaft 1 and to be positioned at and leans below nut 9, the upper end of resilient snubber 11 is spacing by the position limiting structure that shell inner surface is arranged, lower end is spacing by the flange of backup pad 12, described accumulation of energy pipe nipple 15 is the stepped straight tube of external surface, the flange of backup pad 12 is spacing by the step A18 of accumulation of energy pipe nipple external surface, housing locking nut 14 is placed on the middle part of accumulation of energy pipe nipple, lower radial bearing inner ring 13 is provided with between housing locking nut 14 and accumulation of energy pipe nipple, the two ends of lower radial bearing inner ring 13 respectively by the flange of backup pad 12 and the step B19 of accumulation of energy pipe nipple 15 external surface spacing,
Described housing comprises upper shell 5 and lower house 10, the upper end of upper shell 5 is spacing by upper locking nut 2, lower end is spacing by the ledge structure of lower house external surface, the upper end of lower house 10 is spacing by the lower surface of thrust bearings 6 outer ring, lower end is spacing by housing locking nut 14, housing locking nut 14 is connected by left hand thread with the inner surface of lower house 10 lower end, the lower end of upper journal bearing outer ring 3 is provided with flange, the flange of upper journal bearing outer ring is fixedly clamped between the ledge structure and the upper surface, outer ring of thrust bearings 6 of upper shell 5 inner surface, the upper end of resilient snubber 11 is spacing by the ledge structure of lower house inner surface, ledge structure is the position limiting structure that shell inner surface is arranged, according to the needs of drilling condition, can near-bit stabilizer (not shown) be set on lower house,
Be provided with in transmission cushion chamber adjustment spacer 8, adjustment spacer 8 be placed on main shaft 1, adjustment spacer two ends respectively with the lower end, outer ring of thrust bearings 6 and the upper end close contact of resilient snubber 11.
More than show and describe general principle of the present invention and key structural feature.The present invention is not by the restriction of above-mentioned example, and without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements all fall in claimed scope of the present invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. protect the buffering energy storage equipment of down-hole helicoid hydraulic motor and drill bit combination for one kind, at least comprise main shaft, accumulation of energy assembly and the housing be placed on main shaft, it is characterized in that: described housing is spacing with the housing locking nut being positioned at main shaft lower end by the upper locking nut being installed on main shaft upper end, gap between housing and main shaft forms transmission cushion chamber, accumulation of energy assembly is installed in transmission cushion chamber, described accumulation of energy assembly comprises accumulation of energy pipe nipple, backup pad and resilient snubber, accumulation of energy pipe nipple and backup pad are placed on main shaft from bottom to up successively, the inner surface of accumulation of energy pipe nipple offers slideway, accumulation of energy pipe nipple is by being installed on key in slideway and being connected with main shaft and the lower end of accumulation of energy pipe nipple protruding from main shaft lower end, resilient snubber is fixed between backup pad tube wall and housing, the lower end of main shaft is provided with lower locking nut, accumulation of energy pipe nipple is locked by lower locking nut, described backup pad is flanged pipe, the upper end of resilient snubber is spacing by the position limiting structure that shell inner surface is arranged, lower end is spacing by the flange of backup pad, described accumulation of energy pipe nipple is the stepped straight tube of external surface, the flange of backup pad is spacing by the step A of accumulation of energy pipe nipple external surface.
2. the buffering energy storage equipment of protection down-hole helicoid hydraulic motor according to claim 1 and drill bit combination, it is characterized in that: in transmission cushion chamber, be provided with transmission component, described transmission component comprises journal bearing inner ring, upper journal bearing outer ring, lower radial bearing inner ring, the thrust bearings leaning nut and formed with up-thrust bearing by one, upper journal bearing outer ring and upper journal bearing inner ring are placed on main shaft from outside to inside successively, thrust bearings and lean nut from top to bottom order be installed on main shaft, the two ends of thrust bearings are respectively by upper journal bearing inner ring and to lean nut spacing.
3. the buffering energy storage equipment of protection down-hole helicoid hydraulic motor according to claim 2 and drill bit combination; it is characterized in that: thrust bearings and lean between nut and be provided with shoulder cover; the upper end of shoulder cover pushes against the inner ring lower end of thrust bearings, and backup pad is positioned at and leans below nut.
4. the buffering energy storage equipment of the protection down-hole helicoid hydraulic motor according to Claims 2 or 3 and drill bit combination; it is characterized in that: described housing comprises upper shell and lower house; the surface of upper shell and lower house is equipped with ledge structure; the upper end of upper shell is spacing by upper locking nut, lower end is spacing by the ledge structure of lower house external surface; the upper end of lower house is spacing by the lower surface of thrust bearings outer ring, lower end is spacing by housing locking nut, and housing locking nut is threaded with the inner surface of lower house lower end.
5. the buffering energy storage equipment of protection down-hole helicoid hydraulic motor according to claim 4 and drill bit combination; it is characterized in that: housing locking nut is placed on the middle part of accumulation of energy pipe nipple; be provided with lower radial bearing inner ring between housing locking nut and accumulation of energy pipe nipple, the two ends of lower radial bearing inner ring respectively by the flange of backup pad and the step B of accumulation of energy pipe nipple external surface spacing.
6. the buffering energy storage equipment of protection down-hole helicoid hydraulic motor according to claim 4 and drill bit combination; it is characterized in that: the lower end of upper journal bearing outer ring is provided with flange; the flange of upper journal bearing outer ring is fixedly clamped between the ledge structure and the upper surface, outer ring of thrust bearings of upper shell inner surface, and the upper end of resilient snubber is spacing by the ledge structure of lower house inner surface.
7. the buffering energy storage equipment of the protection down-hole helicoid hydraulic motor according to claim 5 or 6 and drill bit combination, is characterized in that: lower house is provided with near-bit stabilizer.
8. the buffering energy storage equipment of the protection down-hole helicoid hydraulic motor according to claim 1 or 5 or 6 and drill bit combination; it is characterized in that: in transmission cushion chamber, be provided with adjustment spacer; adjustment spacer be placed on main shaft, adjustment spacer two ends respectively with the lower end, outer ring of thrust bearings and the upper end close contact of resilient snubber.
9. the buffering energy storage equipment of the protection down-hole helicoid hydraulic motor according to claim 1 or 5 or 6 and drill bit combination, is characterized in that: the screw thread on described housing locking nut external surface is left hand thread.
10. the buffering energy storage equipment of the protection down-hole helicoid hydraulic motor according to claim 1 or 5 or 6 and drill bit combination, is characterized in that: described resilient snubber is spring shim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510867447.3A CN105507821B (en) | 2015-11-30 | 2015-11-30 | A kind of buffering energy storage equipment for protecting underground helicoid hydraulic motor and drill bit combination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510867447.3A CN105507821B (en) | 2015-11-30 | 2015-11-30 | A kind of buffering energy storage equipment for protecting underground helicoid hydraulic motor and drill bit combination |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105507821A true CN105507821A (en) | 2016-04-20 |
| CN105507821B CN105507821B (en) | 2018-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510867447.3A Active CN105507821B (en) | 2015-11-30 | 2015-11-30 | A kind of buffering energy storage equipment for protecting underground helicoid hydraulic motor and drill bit combination |
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| CN (1) | CN105507821B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894483A (en) * | 2020-07-15 | 2020-11-06 | 盐城市荣嘉机械制造有限公司 | High-strength screw drill |
| CN112901654A (en) * | 2021-02-04 | 2021-06-04 | 中国地质科学院勘探技术研究所 | PDC plane thrust bearing set of downhole motor |
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| JP2001082065A (en) * | 1999-07-13 | 2001-03-27 | Tokai Concrete Industries Co Ltd | Deposit removing device for front attachment |
| CN102268961A (en) * | 2011-08-01 | 2011-12-07 | 西南石油大学 | Screw drill transmission shaft assembly with vibration reduction function |
| CN104196441A (en) * | 2014-08-11 | 2014-12-10 | 江阴东辰钻探设备有限公司 | Transmission shaft assembly of screw drill |
| CN204152442U (en) * | 2014-10-11 | 2015-02-11 | 潍坊盛德石油机械制造有限公司 | Fluid power Anti-impact screw drill |
| CN104405437A (en) * | 2014-10-08 | 2015-03-11 | 中国矿业大学 | Mining method employing solid filling and fully-mechanized coal mining hybrid working face |
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2015
- 2015-11-30 CN CN201510867447.3A patent/CN105507821B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001082065A (en) * | 1999-07-13 | 2001-03-27 | Tokai Concrete Industries Co Ltd | Deposit removing device for front attachment |
| CN102268961A (en) * | 2011-08-01 | 2011-12-07 | 西南石油大学 | Screw drill transmission shaft assembly with vibration reduction function |
| CN104196441A (en) * | 2014-08-11 | 2014-12-10 | 江阴东辰钻探设备有限公司 | Transmission shaft assembly of screw drill |
| CN104405437A (en) * | 2014-10-08 | 2015-03-11 | 中国矿业大学 | Mining method employing solid filling and fully-mechanized coal mining hybrid working face |
| CN204152442U (en) * | 2014-10-11 | 2015-02-11 | 潍坊盛德石油机械制造有限公司 | Fluid power Anti-impact screw drill |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894483A (en) * | 2020-07-15 | 2020-11-06 | 盐城市荣嘉机械制造有限公司 | High-strength screw drill |
| CN112901654A (en) * | 2021-02-04 | 2021-06-04 | 中国地质科学院勘探技术研究所 | PDC plane thrust bearing set of downhole motor |
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|---|---|
| CN105507821B (en) | 2018-01-16 |
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