CN104295231B - A kind of low frictional resistance reducing hydrodynamic thrust device - Google Patents
A kind of low frictional resistance reducing hydrodynamic thrust device Download PDFInfo
- Publication number
- CN104295231B CN104295231B CN201410471408.7A CN201410471408A CN104295231B CN 104295231 B CN104295231 B CN 104295231B CN 201410471408 A CN201410471408 A CN 201410471408A CN 104295231 B CN104295231 B CN 104295231B
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- piston
- mandrel
- steel ball
- runddichtringo
- ring
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 239000004519 grease Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 21
- 239000004576 sand Substances 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 206010008469 Chest discomfort Diseases 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
- E21B19/086—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with a fluid-actuated cylinder
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of low frictional resistance reducing hydrodynamic thrust device for oil and gas well drilling operation.Its technical scheme: top connection with subsidiary cylinder with threadeding, subsidiary cylinder with Master cylinder body with threadeding, Master cylinder body with spline tube with threadeding；Piston is placed in subsidiary cylinder, piston is disposed with the second piston cushion cover, first piston ring and first piston cushion cover, the first pressure cap and the first locking cap respectively with piston with threadeding；Mandrel is placed in Master cylinder body and spline tube, is provided with semi-ring in the middle part of mandrel, and mandrel head is disposed with the 4th piston cushion cover, the second piston ring and the 3rd piston cushion cover, the second pressure cap and the second locking cap with mandrel with threadeding；Nozzle carrier, between piston and mandrel, is provided with nozzle in nozzle carrier；Four steel ball seat are distributed between mandrel and spline tube, and steel ball seat is built with steel ball.This instrument can make drill bit really obtain sufficiently large, the pressure of the drill stable, uniform, can prevent sand plug phenomenon, in drillng operation.
Description
Technical field
The present invention relates to a kind of low frictional resistance reducing hydrodynamic thrust device for oil and gas well drilling operation.
Background technology
In conventional drilling operation, either rotating disk creeps into, or downhole motor creeps into, and the weight relying on drill string applies
The pressure of the drill.But during high angle hole, horizontal well creep into, along with the increase of hole angle, rely on drill string weight just to apply the pressure of the drill
More and more difficult, wall friction resistance is the most increasing, directly affects the stressing conditions of drill string, and then the transmission to the pressure of the drill rises
To inhibition；And the working condition that drill string is born is more badly, is easily generated vibration, the particularly extensional vibration of drill string is led
Cause the pressure of the drill and can not keep constant, and then reduce rate of penetration, cause drill bit initial failure, even cause drill string to twist off destruction etc.
Major accident.Therefore, in high angle hole and Slim Hole and sidetrack horizontal well, the method that this tradition applies the pressure of the drill
There is the biggest defect, be not the most well positioned to meet construction needs.
Now there is presently no a set of real drilling well pressurizing tool that can solve this problem, such as Chinese patent 200720081370.8, public affairs
Having opened a kind of minute borehole hydropower presser, this patent structure uses hexagonal kelly transmission moment of torsion and the pressure of the drill；And for example Chinese patent
200820173683.0, disclose a kind of Novel hydraulic presser, this patent structure adopt splined pattern transmission moment of torsion and
The pressure of the drill；For another example Chinese patent 201310327533.6, disclose a kind of retraction type long stroke hydraulic power pressurizer, and this patent is also adopted
Moment of torsion and the pressure of the drill is transmitted with spline structure.Although the most several patents achieve hydraulic pressurization from principle, but hexagonal kelly
Transmitting moment of torsion with spline is all that face contacts with face with the mode of the pressure of the drill, for sliding friction, therefore causes instrument system when transmitting moment of torsion
Self frictional resistance of uniting is increased dramatically, and hinders the transmission of the pressure of the drill so that the pumping efficiency of such instrument is the lowest；Simultaneously because such work
Tool mostly uses throttle nozzle to obtain pressure drop, but when stopping is crept into or after the suspension of works of midway, easily piles up desilting at nozzle,
Producing sand plug phenomenon, various reasons causes such hydraulic thruster to be widely applied the most at the scene.
Summary of the invention
It is an object of the invention to: in order to solve to bore in the drilling process of high angle hole, Slim Hole and sidetrack horizontal well
The problem that head pressurization is difficult, makes drill bit really obtain sufficiently large, the pressure of the drill stable, uniform, and reduces the frictional resistance of drill string,
Playing good cushioning effect, prevent sand plug phenomenon, reduce the generation of lock of tool drilling, it is achieved efficiently creep into, special offer is a kind of low
Frictional resistance reducing hydrodynamic thrust device.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of low frictional resistance reducing hydrodynamic thrust device is a kind of energy
Amount conversion equipment, i.e. utilizes drilling fluid as driving source, drilling fluid kinetic energy is effectively converted to drill bit the pressure of the drill.This instrument is by upper
Joint, an O RunddichtringO, subsidiary cylinder, the first locking cap, the first pressure cap, first piston cushion cover, the 2nd O RunddichtringO,
3rd O RunddichtringO, first piston ring, the second piston cushion cover, piston, the 4th O RunddichtringO, the 5th O RunddichtringO,
Master cylinder body, jump ring, the 6th O RunddichtringO, nozzle, the 7th O RunddichtringO, nozzle carrier, the second locking cap, the second pressure cap,
3rd piston cushion cover, the 8th O RunddichtringO, the 9th O RunddichtringO, the second piston ring, the 4th piston cushion cover, semi-ring, the heart
Axle, baffle ring, steel ball catch, steel ball, steel ball seat, spline tube, rubber packing, mandrel joint and screw composition.Its structure is special
Levy and be: by top connection with subsidiary cylinder with threadeding, subsidiary cylinder with Master cylinder body with threadeding, Master cylinder body and spline tube screw thread
Connect；Piston is placed in subsidiary cylinder, piston is disposed with the second piston cushion cover, first piston ring and first piston pad
Set, by the first pressure cap with piston with threadeding, then by the first locking cap with piston with threadeding；Mandrel is placed in Master cylinder body
With in spline tube, being provided with semi-ring in the middle part of mandrel, mandrel head is disposed with the 4th piston cushion cover, the second piston ring and the 3rd
Piston cushion cover, by the second pressure cap with mandrel with threadeding, then by the second locking cap with mandrel with threadeding；Nozzle carrier is positioned at
Between piston and mandrel, nozzle carrier bonds together with piston, is provided with nozzle in nozzle carrier；Four steel ball seat are distributed in mandrel
With between spline tube, steel ball seat, built with steel ball, is inserted with steel ball catch in the slot at steel ball seat top；Arrange in spline tube end
There is baffle ring, be connected with four screws between baffle ring with spline tube.An O RunddichtringO it is provided with between top connection and subsidiary cylinder；
The 2nd O RunddichtringO it is provided with between first piston ring and subsidiary cylinder；The 3rd O type it is provided with close between first piston ring and piston
Seal；The 4th O RunddichtringO it is provided with between subsidiary cylinder and piston；The 5th O type that is provided with between subsidiary cylinder and Master cylinder body seals
Circle；It is provided with the 6th O RunddichtringO between nozzle carrier and the second locking cap；The 7th O type it is provided with close between nozzle and nozzle carrier
Seal；The 8th O RunddichtringO it is provided with between second piston ring and Master cylinder body；It is provided with the 9th between second piston ring and mandrel
O RunddichtringO；Rubber packing it is provided with between mandrel and spline tube.
Above-mentioned piston lower end is machined with four circular holes, and four circular holes are symmetrical；Process on above-mentioned subsidiary cylinder bottom barrel
There are 12 relief holes.
All being machined with the circular arc passage more than 1/2nd circles in four above-mentioned steel ball seat, the radius of this circular arc passage is more than above-mentioned
The radius of steel ball, the top of steel ball seat is all machined with a slot, is marked with lubricant grease inside steel ball seat；Above-mentioned steel ball catch
Shape identical with the end surface shape of steel ball seat.
Four barriness bond orbitals it are machined with in the middle part of above-mentioned mandrel；Four splines it are machined with inside above-mentioned spline tube.
The present invention compared with the prior art, have the advantages that (1) this tool construction thoroughly solve high angle hole,
The problem that in the drilling process of Slim Hole and sidetrack horizontal well, drill bit pressurization is difficult, the cunning that conventional tool face is contacted with face
Dynamic friction becomes a rolling friction for face contact, greatly reduces the frictional resistance of tool interior, is effectively increased the transmission efficiency of the pressure of the drill,
Ensure that drill bit really obtains sufficiently large, the pressure of the drill stable, uniform；(2) this tool construction is under different duties
There is reducing function, the area of passage of drilling fluid can be changed to solve sand plug phenomenon, reduce the generation of lock of tool drilling；(3) originally
Hydrodynamic thrust device can use as amortisseur, can play good cushioning effect, it is possible to decrease the frictional resistance between drill string and the borehole wall；(4)
Using this hydrodynamic thrust device is drill bit pressurization, can save drill collar and reduce the fatigue rupture of drill collar.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention low frictional resistance reducing hydrodynamic thrust device.
In figure: 1 top connection, 2 the oneth O RunddichtringOs, 3 subsidiary cylinders, 4 first locking caps, 5 first pressure caps, 6
First piston cushion cover, 7 the 2nd O RunddichtringOs, 8 the 3rd O RunddichtringOs, 9 first piston rings, 10 second pistons
Cushion cover, 11 pistons, 12 the 4th O RunddichtringOs, 13 the 5th O RunddichtringOs, 14 Master cylinder bodies, 15 jump rings, 16
6th O RunddichtringO, 17 nozzles, 18 the 7th O RunddichtringOs, 19 nozzle carriers, 20 second locking caps, 21
Second pressure cap, 22 the 3rd piston cushion covers, 23 the 8th O RunddichtringOs, 24 the 9th O RunddichtringOs, 25 second pistons
Ring, 26 the 4th piston cushion covers, 27 semi-rings, 28 mandrels, 29 baffle rings, 30 steel ball catch, 31 steel balls, 32
Steel ball seat, 33 spline tubes, 34 rubber packings, 35 mandrel joints, 36 screws.
Fig. 2 is this hydrodynamic thrust device structural representation under non-duty.
Fig. 3 is the partial enlarged drawing of this hydrodynamic thrust device Fig. 1 steel ball junction.
Fig. 4 is the A A sectional view of this hydrodynamic thrust device Fig. 1.
Fig. 5 is the B B sectional view of this hydrodynamic thrust device Fig. 1.
Detailed description of the invention
Being assembled by each parts according to Fig. 1, whole instrument is connected with drilling rod by the screw buckle of top connection 1, and tool lower portion is led to
Crossing mandrel joint 35 to be connected with drill bit, drilling well position is specified in arrival of then going into the well；As in figure 2 it is shown, now hydrodynamic thrust device is in
The most non-duty of original state, piston 11 is positioned at bottom subsidiary cylinder 3, and mandrel 28 is positioned at bottom Master cylinder body 14, piston 11
The reducing structure (nozzle 17 and circular hole) of bottom and mandrel 28 top also have a certain distance；When bit contact shaft bottom is met
During to resistance, continuing to transfer drill string, mandrel 28 is past retraction under drill bit drag effect, and contacts with nozzle carrier 19, makes piston
The reducing structure (nozzle 17 and circular hole) of 11 bottoms is inserted in the second locking cap 20 at mandrel 28 top, due to nozzle
The 6th O RunddichtringO 16 is had, it is ensured that drilling fluid will not leak, and reduced flow diameter between seat 19 and the second locking cap 20,
So that area of passage reduces, serve the effect of reducing pressurization；Mandrel 28 continue to press on nozzle carrier 19 together with piston 11 on
OK, until the step surface of mandrel joint 35 contacts (top dead-centre) with spline tube 33 lower surface, stop up, now standpipe pressure
The reading of table and weight indicator suspending weight changes, and driller can hold drill string, and stopping side entering；Open drilling pump, by hydrodynamic thrust
Device pressurization is sent into: the internal annular space of drilling fluid entering tool, cleaner for high-pressure drilling fluid forms chock pressure difference at nozzle 17, at piston 11
Upper surface and mandrel 28 upper end surface form two high pressure chests, produce certain static pressure, promote piston 11 together with mandrel 28
Move down, this thrust is passed to drill bit, form the pressure of the drill steady, uniform；Full stroke is reached when hydrodynamic thrust device is sent into,
Driller should transfer drill string in time, and the length that side enters should be close to the stroke of mandrel 28；Then, driller can hold again drill string, stops
Side enters, hydrodynamic thrust device continue pressurization and be sent into, go round and begin again, and circulates work, continuously forms machinery drilling depth.Due to
Using steel ball 31 to connect between mandrel 28 and spline tube 33, the frictional resistance that mandrel 28 moves up and down in spline tube 33 is greatly reduced,
It is effectively increased the pumping efficiency of hydrodynamic thrust device, makes drill bit really obtain sufficiently large the pressure of the drill.
When drilling pump quits work, promoting drilling rod, make piston 11 and mandrel 28 move down by own wt, piston 11 moves
When moving bottom subsidiary cylinder 3, mandrel 28 also to continue to move down a segment distance, can be only achieved bottom Master cylinder body 14, and this is just
Mandrel 28 is mutually disengaged with the variable-diameter structure (nozzle 17 and circular hole) of piston 11 bottom, and area of passage increases, drilling well
Liquid is flowed out by the circular hole of piston 11 bottom, efficiently solves sand plug phenomenon.
The foregoing is only one embodiment of the present of invention, in addition to the implementation, on the basis of the present embodiment, also may be used
Increase multi-level piston and the quantity of cylinder body on the top of piston 11 and subsidiary cylinder 3, form Multi-stage hydraulic cylinder pressurization, bigger to obtain
The pressure of the drill；Meanwhile, the rolling friction form such as steel ball 31 or ball is used between every mandrel 28 and spline tube 33, all at this
In the protection domain of invention.
Claims (5)
1. a low frictional resistance reducing hydrodynamic thrust device, be by top connection, an O RunddichtringO, subsidiary cylinder, the first locking cap,
First pressure cap, first piston cushion cover, the 2nd O RunddichtringO, the 3rd O RunddichtringO, first piston ring, the second piston cushion cover,
Piston, the 4th O RunddichtringO, the 5th O RunddichtringO, Master cylinder body, jump ring, the 6th O RunddichtringO, nozzle, the 7th O
RunddichtringO, nozzle carrier, the second locking cap, the second pressure cap, the 3rd piston cushion cover, the 8th O RunddichtringO, the 9th O type are close
Seal, the second piston ring, the 4th piston cushion cover, semi-ring, mandrel, baffle ring, steel ball catch, steel ball, steel ball seat, spline tube,
Rubber packing, mandrel joint and screw composition, is characterized in that: by top connection (1) with subsidiary cylinder (3) with threadeding, secondary
Cylinder body (3) with Master cylinder body (14) with threadeding, Master cylinder body (14) with spline tube (33) with threadeding；By piston (11)
In being placed in subsidiary cylinder (3), piston (11) is disposed with the second piston cushion cover (10), first piston ring (9) and the
One piston cushion cover (6), by the first pressure cap (5) with piston (11) with threadeding, then by the first locking cap (4) and piston
(11) with threaded；Mandrel (28) being placed in Master cylinder body (14) and spline tube (33), mandrel (28) middle part sets
Being equipped with semi-ring (27), mandrel (28) head is disposed with the 4th piston cushion cover (26), the second piston ring (25) and the 3rd
Piston cushion cover (22), by the second pressure cap (21) with mandrel (28) with threadeding, then by the second locking cap (20) and mandrel
(28) with threaded；Nozzle carrier (19) is positioned between piston (11) and mandrel (28), nozzle carrier (19) and piston
(11) bond together, in nozzle carrier (19), be provided with nozzle (17)；Four steel ball seat (32) are distributed in mandrel (28)
With between spline tube (33), steel ball seat (32), built with steel ball (31), is inserted with steel ball in the slot at steel ball seat (32) top
Catch (30)；Baffle ring (29) it is provided with, with four between baffle ring (29) and spline tube (33) in spline tube (33) end
Screw (36) connects.
Low frictional resistance reducing hydrodynamic thrust device the most according to claim 1, is characterized in that: piston (11) bottom processes
Having four circular holes, four circular holes are symmetrical；It is machined with 12 relief holes on above-mentioned subsidiary cylinder (3) bottom barrel.
Low frictional resistance reducing hydrodynamic thrust device the most according to claim 1, is characterized in that: in four steel ball seat (32) all
Being machined with the circular arc passage more than 1/2nd circles, the radius of this circular arc passage is more than the radius of steel ball (31), steel ball seat (32)
Top be all machined with a slot, steel ball seat (32) is internal is marked with lubricant grease；The shape of above-mentioned steel ball catch (30)
Identical with the end surface shape of steel ball seat (32).
Low frictional resistance reducing hydrodynamic thrust device the most according to claim 1, is characterized in that: mandrel (28) middle part is machined with
Four barriness bond orbitals；Spline tube (33) is internal is machined with four splines.
Low frictional resistance reducing hydrodynamic thrust device the most according to claim 1, is characterized in that: top connection (1) and subsidiary cylinder (3)
Between be provided with an O RunddichtringO (2)；The 2nd O type that is provided with between first piston ring (9) and subsidiary cylinder (3) seals
Circle (7)；The 3rd O RunddichtringO (8) it is provided with between first piston ring (9) and piston (11)；Subsidiary cylinder (3) is with alive
It is provided with the 4th O RunddichtringO (12) between plug (11)；It is provided with the 5th O between subsidiary cylinder (3) and Master cylinder body (14)
RunddichtringO (13)；It is provided with the 6th O RunddichtringO (16) between nozzle carrier (19) and the second locking cap (20)；Nozzle
And between nozzle carrier (19), be provided with the 7th O RunddichtringO (18) (17)；Second piston ring (25) and Master cylinder body (14)
Between be provided with the 8th O RunddichtringO (23)；The 9th O type that is provided with between second piston ring (25) and mandrel (28) seals
Circle (24)；Rubber packing (34) it is provided with between mandrel (28) and spline tube (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410471408.7A CN104295231B (en) | 2014-09-16 | 2014-09-16 | A kind of low frictional resistance reducing hydrodynamic thrust device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410471408.7A CN104295231B (en) | 2014-09-16 | 2014-09-16 | A kind of low frictional resistance reducing hydrodynamic thrust device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104295231A CN104295231A (en) | 2015-01-21 |
| CN104295231B true CN104295231B (en) | 2016-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410471408.7A Active CN104295231B (en) | 2014-09-16 | 2014-09-16 | A kind of low frictional resistance reducing hydrodynamic thrust device |
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| Country | Link |
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| CN (1) | CN104295231B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105781464B (en) * | 2016-04-26 | 2018-10-02 | 西南石油大学 | Single-cylinder dual-action hydraulic drilling jar |
| CN106014317B (en) * | 2016-06-02 | 2018-10-19 | 西南石油大学 | Hydroscillator with cumulative shock-absorbing function |
| CN109556517B (en) * | 2018-12-28 | 2020-08-21 | 中国科学院长春光学精密机械与物理研究所 | Real-time measurement system for terminal pose of six-foot positioning platform |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997001693A1 (en) * | 1995-06-27 | 1997-01-16 | Shell Internationale Research Maatschappij B.V. | Hydraulic thruster for use in a drill string |
| RU2214495C1 (en) * | 2002-04-19 | 2003-10-20 | ОАО НПО "Буровая техника" | Device for well drilling by downhole hydraulic motor |
| CN201141287Y (en) * | 2007-09-30 | 2008-10-29 | 西南石油大学 | Minute borehole hydropower presser |
| CN202451049U (en) * | 2012-02-07 | 2012-09-26 | 辽宁金钻工大机械有限公司 | Seal device of transmission shaft of PDM (positive displacement motor) drill |
| CN102704857A (en) * | 2012-06-21 | 2012-10-03 | 中国石油大学(华东) | Underground supercharging and accelerating system |
| CN204081990U (en) * | 2014-09-16 | 2015-01-07 | 西南石油大学 | A kind of low frictional resistance reducing hydrodynamic thrust device |
-
2014
- 2014-09-16 CN CN201410471408.7A patent/CN104295231B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997001693A1 (en) * | 1995-06-27 | 1997-01-16 | Shell Internationale Research Maatschappij B.V. | Hydraulic thruster for use in a drill string |
| RU2214495C1 (en) * | 2002-04-19 | 2003-10-20 | ОАО НПО "Буровая техника" | Device for well drilling by downhole hydraulic motor |
| CN201141287Y (en) * | 2007-09-30 | 2008-10-29 | 西南石油大学 | Minute borehole hydropower presser |
| CN202451049U (en) * | 2012-02-07 | 2012-09-26 | 辽宁金钻工大机械有限公司 | Seal device of transmission shaft of PDM (positive displacement motor) drill |
| CN102704857A (en) * | 2012-06-21 | 2012-10-03 | 中国石油大学(华东) | Underground supercharging and accelerating system |
| CN204081990U (en) * | 2014-09-16 | 2015-01-07 | 西南石油大学 | A kind of low frictional resistance reducing hydrodynamic thrust device |
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| Publication number | Publication date |
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| CN104295231A (en) | 2015-01-21 |
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