CN205638221U - Injection process falls turns round pressure device - Google Patents
Injection process falls turns round pressure device Download PDFInfo
- Publication number
- CN205638221U CN205638221U CN201620205292.7U CN201620205292U CN205638221U CN 205638221 U CN205638221 U CN 205638221U CN 201620205292 U CN201620205292 U CN 201620205292U CN 205638221 U CN205638221 U CN 205638221U
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- China
- Prior art keywords
- movable valve
- valve plug
- pressue device
- hole
- spurt method
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Abstract
The utility model provides an injection process falls turns round pressure device gu fixed valve element all sets up in the urceolus wall with the movable valve element that lives, lives and leaves the interval between movable valve element and the cardan shaft and form the annular space, is equipped with the drilling fluid passageway on the movable valve element that lives, and solid fixed valve element cover is in the movable valve element lower part of living, solid fixed valve element, the airtight cavity of formation between movable valve element and the urceolus wall of living, and elastomeric element installs in airtight cavity, gu be equipped with the mutual through -hole I who corresponds on fixed valve element and the movable valve element alive, be equipped with the nozzle on the urceolus wall, spare part is few, long service life, and the price is low, and is not fragile, can use with coiled tubing is supporting, because of the characteristics of its unique no moment of torsion, in the time of can preventing the coiled tubing well drilling, the condition that lower part power drilling tool rotation arousing upper portion coiled tubing reverse rotation knotd takes place, can be according to the flow of the drilling fluid pressure automatically regulated of difference blowout liquid to automatic balance the reaction torque of screw rod drilling tool outer wall, form that can the nipple joint is assembled, the convenient change.
Description
Technical field
This utility model belongs to Oil/gas Well technical field, and specifically, this utility model relates to a kind of spurt method fall and turns round pressurization
Device.
Background technology
At present, during coiled tubing drilling, drill bit is rotated by well dynamic motor, by controlling the instrument of lower drilling tool
Face realizes orientation and creeps into function.Drill bit can produce reaction torque in rock break-off process, causes drilling tool to reversely rotate, causes tool-face
Control shakiness, thus affect the seriality and speed crept into.
For this problem, the most more advanced horizontal well boring means downhole tractor, also it is down-hole crawl device,
Actual job obtains test widely, respond well.But traction apparatus is because itself design, the defect is had to be exactly
Can not realize working continuously, extend the duration, increase cost.Retractor device part is many simultaneously, fragile, and service life is short.Just
The one worked out goes reaction torque drilling rig to be analyzed, and which employs planetary gear drive, and inside and outside pair of drill bit is reverse
Rotating, reach anti-twisted purpose, but its structure is complicated, job stability is the highest, and service life is short.
The patent of invention of Patent No. CN201210207397.2 discloses complex structural well drag reduction fall and turns round combined drilling side
Method, is to be arranged on by underground anti-drag twisting reducer between top drilling tool and measurement while drilling BHA so that top drilling tool can phase
Measurement while drilling drilling tool is independently rotated；Reaction torque bascule is arranged between power drilling tool and drill bit, eliminates power drill
The reaction torque that tool the produces interference to tool-face, anti-drag twisting reducer can be rotary drilling at guide digging time-varying drill string slipping drilling
Enter, reducing friction resistance and loss of machine of torque, reduce drill string and glue the incidence rate of card complex situations；Reaction torque bascule can be effective
The reaction torque that elimination power drilling tool the produces impact on tool-face, controls tool-face and keeps stable, raising hole trajectory control essence
Degree, improves wellbore quality, but this patent of invention still can not realize the function of pressurization, and is only applicable to complex structural well and efficiently bores
Enter.
Utility model content
In order to overcome above problems of the prior art, this utility model provides the fall torsion of a kind of spurt method to add to press-fit
Put, be arranged in outer tube wall including fixed spool and movable valve plug, fixed spool and movable valve plug, described fixed spool and work
Being provided with universal drive shaft inside movable valve plug, the spacing between movable valve plug and universal drive shaft forms annular space, and movable valve plug is provided with drilling fluid
Passage, fixed spool is enclosed within movable valve plug bottom, forms a closed cavity between fixed spool, movable valve plug and outer tube wall,
Elastomeric element is arranged in closed cavity, and fixed spool is provided with the most corresponding through hole I with movable valve plug, on described outer tube wall
It is provided with nozzle.
Preferably, described nozzle is radially circularly and evenly distributed, and axially goes up uneven distribution.
Preferably, the port of export of described nozzle is tangent with outer tube wall in radial direction for any of the above-described scheme, going out of nozzle
Mouthful end between axial direction and axis in certain angle.
Preferably, the port of export of described nozzle angular range between axial direction and axis is any of the above-described scheme
10°-40°。
Preferably, the port of export of described nozzle angular range between axial direction and axis is any of the above-described scheme
25°。
Preferably, the quantity of described nozzle is two or more to any of the above-described scheme.
Preferably, the quantity of described nozzle is 8 to any of the above-described scheme.
Preferably, described through hole I includes through hole II and through hole III to any of the above-described scheme.
Preferably, the quantity of described through hole II and through hole III is more than one to any of the above-described scheme.
Preferably, described through hole II is arranged on fixed spool top to any of the above-described scheme, and through hole III is arranged on moving valve
Core bottom.
Preferably, described through hole II and through hole III is radially circumferentially distributed any of the above-described scheme, axial uneven point
Cloth.
Preferably, described through hole II size each other all differs any of the above-described scheme, and through hole III is each other
Size all differ.
Any of the above-described scheme preferably, at least one through hole III in described movable valve plug and fixed spool extremely
A few through hole II size and location is the most corresponding.
Preferably, described fluid passage is opening to any of the above-described scheme, and opening inclines from movable valve plug upper surface
Tiltedly extend to inside movable valve plug.
Preferably, the quantity of described opening is 8 to any of the above-described scheme.
Preferably, described movable valve plug and fixed spool are sleeve-shaped to any of the above-described scheme.
Any of the above-described scheme preferably, is slidably connected with outer tube wall outside described movable valve plug.
Preferably, described annular space is arranged between movable valve plug lower inside and universal drive shaft any of the above-described scheme.
Any of the above-described scheme preferably, is welded on outer tube wall outside described fixed spool, with ten thousand inside fixed spool
Between axle, leave spacing circulate for drilling fluid.
Preferably, described elastomeric element is spring to any of the above-described scheme, and spring makes the movable valve plug can be at axial elasticity
Slide.
Preferably, described movable valve plug top is provided with postive stop baffle to any of the above-described scheme, and postive stop baffle is used for limiting work
The sliding scale of movable valve plug.
Any of the above-described scheme preferably, is provided with bearing between described movable valve plug and universal drive shaft.
This utility model provides a kind of spurt method fall to turn round pressue device, including fixed spool and movable valve plug, fixed spool
It is arranged in outer tube wall with movable valve plug, inside described fixed spool and movable valve plug, is provided with universal drive shaft, movable valve plug and ten thousand
Leaving spacing between axle and form annular space, movable valve plug is provided with fluid passage, and fixed spool is enclosed within movable valve plug bottom, Gu
Forming a closed cavity between fixed valve plug, movable valve plug and outer tube wall, elastomeric element is arranged in closed cavity, fixed spool
Be provided with the most corresponding through hole I with movable valve plug, described outer tube wall is provided with nozzle, adds the pressure of the drill by this device,
And counteract and reach according to reaction torque produced by different drilling liquid pressures, concrete beneficial effect have following some:
(1), regurgitating that to shoot reaction torque pressue device parts few, service life is long, and price is than like product such as well simultaneously
Lower traction apparatus is low, is not easy to damage；
(2) regurgitate and shoot reaction torque pressue device and support the use with coiled tubing, because of the feature without moment of torsion of its uniqueness, energy
Enough during prevention coiled tubing drilling, lower power drilling tool rotary has been quoted top coiled tubing and has been reversely rotated the situation generation of knotting；
(3) regurgitate shoot reaction torque pressue device can according to different drilling liquid pressures be automatically adjusted ejection liquid stream
Amount, thus the autobalance reaction torque of helicoid hydraulic motor outer wall；
(4) this device can assemble with the form of pipe nipple, is convenient for changing.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram that spurt method fall turns round pressue device；
Fig. 2 is the close-up schematic view of Fig. 1；
Fig. 3 is the partial structurtes schematic diagram of Fig. 1；
Fig. 4 is the side view of Fig. 1.
Detailed description of the invention
In order to be best understood from the technical solution of the utility model and advantage, below by way of detailed description of the invention, and combine attached
This utility model is described further by figure.
Embodiment 1
As depicted in figs. 1 and 2, this utility model provides a kind of spurt method fall to turn round pressue device, and spurt method fall torsion adds and press-fits
Put, be made up of fixed spool 1, movable valve plug 2, outer tube wall 3, spring 5, universal drive shaft 4, bearing 6, postive stop baffle 7, nozzle 8, urceolus
Wall 3 upper external screw thread connects universal drive shaft outer tube wall, and lower end female thread connects power transmission shaft outer tube wall.
Spurt method fall is turned round pressue device and is placed in universal drive shaft and power transmission shaft junction, and pouring cap top, the design increases
Universal drive shaft assembly end so that it is can accommodate to regurgitate and shoot reaction torque pressue device.
Movable valve plug 2 and fixed spool 1 are in sleeve-shaped, and universal drive shaft 4 passes through.Live with outer tube wall 3 outside movable valve plug 2
It is dynamically connected, between movable valve plug 2 lower inside and universal drive shaft 4, leaves spacing, form annular space 9.As it is shown on figure 3, in movable valve plug 2
Circle distribution opening 2-1 between end face and lower inside, as fluid passage, opening 2-1 is from movable valve plug 2 upper surface
Tilt to extend to inside movable valve plug 2.Fix with outer tube wall 3 outside fixed spool 1 and be connected, with universal drive shaft 4 inside fixed spool 1
Between leave spacing, for drilling fluid circulate.Fixed spool 1 upper socket, in movable valve plug 2 bottom, makes fixed spool 1, moving valve
A closed cavity 10 is formed between core 2 and outer tube wall 3.Spring 5 is arranged in closed cavity 10, and spring 5 connects movable valve plug 2
With fixed spool 1, make the movable valve plug 2 can Elastic Sliding in the axial direction.Movable valve plug 2 top is equipped with postive stop baffle 7, limiting block
Plate 7 is connected with outer tube wall 3.
Fixed spool 1 is provided with the most corresponding through hole I, described through hole I and includes through hole II1-1 and lead to movable valve plug 2
Hole III2-2, fixed spool 1 top has several through hole II1-1, movable valve plug 2 bottom to be provided with III2-2, through hole II1-1 and through hole
III2-2 is radially circumferentially distributed, and the size in through hole II1-1 and through hole III2-2 hole differs, through hole II1-1 and through hole III2-
The position of 2 uneven distribution in the axial direction, each through hole III2-2 in movable valve plug 2 has one on fixed spool 1
Size and location corresponding through hole II1-1.When movable valve plug 2 moves downward under the effect of spring 5, move to not coordination
When putting, different through hole III2-2 and through hole II1-1 is connected between movable valve plug 2 and fixed spool 1.
As shown in Figure 4, eight nozzles 8 are arranged on outer tube wall 3, and nozzle 8 is radially being circularly and evenly distributed, axially on not
It is uniformly distributed.Nozzle 8 is tangent with outer tube wall 3 in radial direction, and the angle between axial direction and axis is 15 °.
The spurt method fall that this utility model provides turns round pressue device can individually become a pipe nipple, upper end and universal drive shaft assembly
Being connected, lower end is connected with driving-shaft assembly.When cleaner for high-pressure drilling fluid drives helicoid hydraulic motor to rotate, drilling liquid pressure extruding is lived
Movable valve plug 2 upper surface, makes spring 5 compress, and movable valve plug 2 moves down, and it is logical that movable valve plug 2 and fixed spool 1 upward pressure match
Hole III2-2 is connected with through hole II1-1, and cleaner for high-pressure drilling fluid is entered in closed cavity 10 by fluid passage opening 2-1,
After spray at nozzle 8, owing to nozzle 8 is radially being circularly and evenly distributed, axially go up uneven distribution, and nozzle 8 be in radial direction
Direction is tangent with outer tube wall 3, and the angle between axial direction and axis is 15 °, therefore produces on outer tube wall 3 and regurgitates moment,
Offset reaction torque, produce thrust in the axial direction, thus improve the pressure of the drill.
The principle that the spurt method fall that this utility model provides turns round pressue device is as follows: when cleaner for high-pressure drilling fluid drives helicoid hydraulic motor
During rotation, drilling liquid pressure extrusion spring 5, make movable valve plug 2 move down, according to different pressures size, connect different through holes (logical
Hole III2-2 and through hole II1-1), in drilling fluid stays closed cavity 10, and sprayed by nozzle 8.Due to nozzle 8 radial spray
Direction is tangent with outer tube wall 3, makes outer tube wall 3 produce a moment of torsion contrary with drill bit reaction torque so that it is to offset, reaches anti-
The purpose of moment of torsion.The axial injection direction of nozzle 8 is contrary with drill bit advancing direction, makes outer tube wall 3 produce a thrust forward,
Reach to increase the purpose of the pressure of the drill.When termination of pumping, spring 5 resets, and movable valve plug 2 returns at stopping means, and all of through hole is the most logical
Hole III2-2 and through hole II1-1 closes, and quits work.
This utility model provides a kind of spurt method fall to turn round pressue device, adds the pressure of the drill by this device, and counteracts
Reach according to reaction torque produced by different drilling liquid pressures, concrete beneficial effect have following some:
(1), regurgitating that to shoot reaction torque pressue device parts few, service life is long, and price is than like product such as well simultaneously
Lower traction apparatus is low, is not easy to damage；
(2) regurgitate and shoot reaction torque pressue device and support the use with coiled tubing, because of the feature without moment of torsion of its uniqueness, energy
Enough during prevention coiled tubing drilling, lower power drilling tool rotary has been quoted top coiled tubing and has been reversely rotated the situation generation of knotting；
(3) regurgitate shoot reaction torque pressue device can according to different drilling liquid pressures be automatically adjusted ejection liquid stream
Amount, thus the autobalance reaction torque of helicoid hydraulic motor outer wall；
(4) this device can assemble with the form of pipe nipple, is convenient for changing.
Embodiment 2
A kind of spurt method fall turns round pressue device, and as different from Example 1, this spurt method fall turns round the moving valve of pressue device
Installing bearing 6 between core 2 inside upper part and universal drive shaft 4, design bearing 6 is to make universal drive shaft 4 slow-roll stabilization, preventing universal drive shaft
4 ends are long causes discontinuity.
Embodiment 3
A kind of spurt method fall turns round pressue device, and as different from Example 2, this spurt method fall turns round the moving valve of pressue device
8 opening 2-1 of circle distribution between core 2 upper surface and lower inside, as fluid passage.
Embodiment 4
A kind of spurt method fall turns round pressue device, as different from Example 1, welds with outer tube wall 3 outside described fixed spool 1
Connect.
Embodiment 5
A kind of spurt method fall turns round pressue device, and as different from Example 1, elastic rubber fitting is arranged in cavity, connects and lives
Movable valve plug 2 and fixed spool 1, make movable valve plug 2 can slide at axial elasticity.
Embodiment 6
A kind of spurt method fall turns round pressue device, as different from Example 1, equipped with postive stop baffle at movable valve plug 2 top
7, postive stop baffle 7 is threadeded with outer tube wall 3, and postive stop baffle 7 can restraint spool 2 sliding scale.
Embodiment 7
A kind of spurt method fall turns round pressue device, and as different from Example 1, six nozzles 8 are arranged on outer tube wall 3,
Radially it is circularly and evenly distributed, axially goes up uneven distribution.
Embodiment 8
A kind of spurt method fall turns round pressue device, and as different from Example 1, four nozzles 8 are arranged on outer tube wall 3,
Radially it is circularly and evenly distributed, axially goes up uneven distribution.
Embodiment 9
A kind of spurt method fall turns round pressue device, and as different from Example 1, ten nozzles 8 are arranged on outer tube wall 3,
Radially it is circularly and evenly distributed, axially goes up uneven distribution.
Embodiment 10
A kind of spurt method fall turns round pressue device, and as different from Example 1, nozzle 8 is in radial direction and outer tube wall 3 phase
Cutting, the angle between axial direction and axis is 20 °.
Embodiment 11
A kind of spurt method fall turns round pressue device, and as different from Example 1, nozzle 8 is in radial direction and outer tube wall 3 phase
Cutting, the angle between axial direction and axis is 25 °.
Embodiment 12
A kind of spurt method fall turns round pressue device, and as different from Example 1, nozzle 8 is in radial direction and outer tube wall 3 phase
Cutting, the angle between axial direction and axis is 30 °.
Embodiment 13
A kind of spurt method fall turns round pressue device, and as different from Example 1, nozzle 8 is in radial direction and outer tube wall 3 phase
Cutting, the angle between axial direction and axis is 35 °.
Embodiment 14
A kind of spurt method fall turns round pressue device, and as different from Example 1, nozzle 8 is in radial direction and outer tube wall 3 phase
Cutting, the angle between axial direction and axis is 40 °.
Embodiment 15
A kind of spurt method fall turns round pressue device, and as different from Example 1, nozzle 8 is in radial direction and outer tube wall 3 phase
Cutting, the angle between axial direction and axis is 45 °.
Embodiment 16
A kind of spurt method fall turns round pressue device, and as different from Example 1, nozzle 8 is in radial direction and outer tube wall 3 phase
Cutting, the angle between axial direction and axis is 50 °.
Embodiment 17
A kind of spurt method fall turns round pressue device, and as different from Example 1, several through hole II1-is arranged at fixed spool 1 top
1, through hole II1-1 are radially circumferentially distributed, and uneven distribution in the axial direction, the size in through hole II1-1 hole the most gradually increases
Greatly.
Embodiment 18
A kind of spurt method fall turns round pressue device, and as different from Example 1, movable valve plug 2 bottom is provided with III2-2, through hole
III2-2 is radially circumferentially distributed, and uneven distribution in the axial direction, the size in through hole III2-2 hole is different, through hole III2-2
The size in hole is gradually increased from top to bottom.
It should be noted that various embodiments above is only in order to illustrate the technical solution of the utility model, it is not intended to limit；
Although being described in detail this utility model with reference to foregoing embodiments, those of ordinary skill in the art should manage
Solve: the technical scheme described in foregoing embodiments still can be modified by it, or to the most some or all of skill
Art feature carries out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from this utility model
The scope of each embodiment technical scheme.
Claims (22)
1. spurt method fall turns round a pressue device, including fixed spool (1) and movable valve plug (2), fixed spool (1) and moving valve
Core (2) is arranged in outer tube wall (3), it is characterised in that described fixed spool (1) and movable valve plug (2) inside are provided with universal
Axle (4), the spacing between movable valve plug (2) and universal drive shaft (4) forms annular space (9), and movable valve plug (2) is provided with drilling fluid and leads to
Road, fixed spool (1) is enclosed within movable valve plug (2) bottom, is formed between fixed spool (1), movable valve plug (2) and outer tube wall (3)
One closed cavity (10), elastomeric element is arranged in closed cavity (10), and fixed spool (1) is provided with movable valve plug (2)
The most corresponding through hole I, described outer tube wall (3) is provided with nozzle (8).
2. a kind of spurt method fall as claimed in claim 1 turns round pressue device, it is characterised in that: described nozzle (8) is radially in circle
Week is uniformly distributed, and axially goes up uneven distribution.
3. a kind of spurt method fall as claimed in claim 1 or 2 turns round pressue device, it is characterised in that: the outlet of described nozzle (8)
Hold tangent with outer tube wall (3) in radial direction, the port of export of nozzle (8) between axial direction and axis in certain angle.
4. a kind of spurt method fall as claimed in claim 3 turns round pressue device, it is characterised in that: the port of export of described nozzle (8)
Angular range between axial direction and axis is 10 °-40 °.
5. a kind of spurt method fall as claimed in claim 4 turns round pressue device, it is characterised in that: the port of export of described nozzle (8)
Angle between axial direction and axis is 25 °.
6. a kind of spurt method fall as claimed in claim 4 turns round pressue device, it is characterised in that: the quantity of described nozzle (8) is
Two or more.
7. a kind of spurt method fall as claimed in claim 4 turns round pressue device, it is characterised in that: the quantity of described nozzle (8) is 8
Individual.
8. a kind of spurt method fall as claimed in claim 1 turns round pressue device, it is characterised in that: described through hole I includes through hole II
(1-1) with through hole III(2-2).
9. spurt method fall as claimed in claim 8 a kind of turns round pressue device, it is characterised in that: described through hole II(1-1) and lead to
Hole III(2-2) quantity be more than one.
10. a kind of spurt method fall as claimed in claim 8 turns round pressue device, it is characterised in that: described through hole II(1-1) arrange
At fixed spool (1) top, through hole III(2-2) it is arranged on movable valve plug (2) bottom.
11. spurt methods falls as claimed in claim 8 a kind of turn round pressue devices, it is characterised in that: described through hole II(1-1) and lead to
Hole III(2-2) radially circumferentially it is distributed, axially go up uneven distribution.
12. a kind of spurt method falls as claimed in claim 8 turn round pressue device, it is characterised in that: described through hole II(1-1) mutual
Between size all differ, through hole III(2-2) size each other all differs.
13. a kind of spurt method falls as claimed in claim 10 turn round pressue device, it is characterised in that: in described movable valve plug (2)
At least one through hole III(2-2) and fixed spool (1) at least one through hole II(1-1) size and location is the most corresponding.
14. a kind of spurt method falls as claimed in claim 1 turn round pressue device, it is characterised in that: described fluid passage is stream
Through hole (2-1), opening (2-1) tilts to extend to movable valve plug (2) inner side from movable valve plug (2) upper surface.
15. a kind of spurt method falls as claimed in claim 14 turn round pressue device, it is characterised in that: described opening (2-1)
Quantity is 8.
16. a kind of spurt method falls as claimed in claim 1 turn round pressue device, it is characterised in that: described movable valve plug (2) is with solid
Fixed valve plug (1) is in sleeve-shaped.
17. a kind of spurt method falls as claimed in claim 16 turn round pressue device, it is characterised in that: described movable valve plug (2) is outward
Side is slidably connected with outer tube wall (3).
18. a kind of spurt method falls as claimed in claim 1 turn round pressue device, it is characterised in that: described annular space (9) is arranged on work
Between movable valve plug (2) lower inside and universal drive shaft (4).
19. a kind of spurt method falls as claimed in claim 1 turn round pressue device, it is characterised in that: described fixed spool (1) outside
It is welded on outer tube wall (3), leaves spacing between fixed spool (1) inner side and universal drive shaft (4) and circulate for drilling fluid.
20. a kind of spurt method falls as claimed in claim 1 turn round pressue device, it is characterised in that: described elastomeric element is spring
(5), spring (5) makes movable valve plug (2) can slide at axial elasticity.
21. a kind of spurt method falls as claimed in claim 1 turn round pressue device, it is characterised in that: described movable valve plug (2) top
Being provided with postive stop baffle (7), postive stop baffle (7) is for the sliding scale of restraint spool (2).
22. a kind of spurt method falls as claimed in claim 1 turn round pressue device, it is characterised in that: described movable valve plug (2) and ten thousand
Bearing (6) it is provided with between axle (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620205292.7U CN205638221U (en) | 2016-03-17 | 2016-03-17 | Injection process falls turns round pressure device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620205292.7U CN205638221U (en) | 2016-03-17 | 2016-03-17 | Injection process falls turns round pressure device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205638221U true CN205638221U (en) | 2016-10-12 |
Family
ID=57077380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620205292.7U Expired - Fee Related CN205638221U (en) | 2016-03-17 | 2016-03-17 | Injection process falls turns round pressure device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205638221U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105715209A (en) * | 2016-03-17 | 2016-06-29 | 长江大学 | Device for decreasing torque and increasing pressure by jetting method |
-
2016
- 2016-03-17 CN CN201620205292.7U patent/CN205638221U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105715209A (en) * | 2016-03-17 | 2016-06-29 | 长江大学 | Device for decreasing torque and increasing pressure by jetting method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161012 Termination date: 20170317 |
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| CF01 | Termination of patent right due to non-payment of annual fee |