CN110374512A - A kind of concentric type twin-stage double speed PDC drill bit - Google Patents
A kind of concentric type twin-stage double speed PDC drill bit Download PDFInfo
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- CN110374512A CN110374512A CN201910521051.1A CN201910521051A CN110374512A CN 110374512 A CN110374512 A CN 110374512A CN 201910521051 A CN201910521051 A CN 201910521051A CN 110374512 A CN110374512 A CN 110374512A
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- drill bit
- bit
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- pilot
- stage double
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- 238000005553 drilling Methods 0.000 claims abstract description 60
- 239000011435 rock Substances 0.000 claims abstract description 42
- 238000011010 flushing procedure Methods 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 12
- 210000002445 nipple Anatomy 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 240000004343 Indigofera suffruticosa Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- 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
- E21B10/00—Drill bits
- E21B10/02—Core bits
- E21B10/06—Roller core bits
-
- 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
- E21B10/00—Drill bits
- E21B10/08—Roller bits
-
- 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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
-
- 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
-
- 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
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 provides a kind of concentric type twin-stage double speed PDC drill bits, PDC drill bit is concentric integral type, the wherein drill bit different with two-stage diameter, wherein be relatively large in diameter is re-drill bit, lesser diameter is pilot bit, it is drilled out using larger-diameter level-one drill bit and leads eye, discharge rock internal stress, then utilize the second level drill bit follow-up broken rock of small diameter；Re-drill bit has higher revolving speed than pilot bit, and when re-drill bit and the pilot bit turn to identical, re-drill bit revolving speed is higher than pilot bit revolving speed；When re-drill bit and pilot bit turn to opposite, the additional torque of drill string is reduced, while the matching of re-drill bit and pilot bit is optimal, to carry out fast drilling；Pilot bit is tricone bit, and the re-drill bit for following its mouthful closely is PDC drill bit, twin-stage drill bit is consequently formed, and two-stage drill bit axis of rotation is overlapped up and down, tricone bit is connected with PDC drill bit by the regular button-type of tapered thread.
Description
Technical field
The present invention relates to a kind of PDC drill bit technical field, especially a kind of concentric type twin-stage double speed PDC drill bit.
Background technique
Drilling well is an important link of exploration, exploitation petroleum gas and deep mineral resources.Low Permeability Oil/gas at present
Hiding is one kind of focus development, such oil-gas reservoir is of the remote past with reservoir geology, construction is complicated, bury depth and rock is hard
A series of feature, so there are drilling well difficult points.Wherein under the premise of ensuring drilling safety, improves rate of penetration, reduces drilling well
Cost is main problem.Low permeability formation drilling technology enters vertical drilling system, rotary steerable drilling system, efficient PDC at present
Drill bit, effectively power drilling tool and relevant ground drilling equipment are more advanced, are singly still to be difficult to meet requirement, because
This, can only return to and be applicable in conventional PDC drill bit and mud motor, and cost is although low, but technical level falls behind relatively, mentions
The ability of high rate of penetration is lower, it is difficult to meet the needs of Low permeable oil and gas reservoirs Efficient Development.
Therefore it needs to develop the twin-stage double speed drilling well PDC drill bit for being suitable for Low permeable oil and gas reservoirs exploitation, and is equipped with appropriate
Core drill to give full play to the advantage of PDC drill bit, while not changing existing drilling technology and equipment, improve cost performance and
Speed-increasing effect.
Summary of the invention
To overcome the shortcomings of existing technologies, the purpose of the present invention is to provide a kind of concentric type twin-stage double speed PDC drill bit, with
It overcomes the deficiencies of existing technologies.
The purpose of the present invention is to provide a kind of concentric type twin-stage double speed PDC drill bit, the PDC drill bit is concentric one
Formula, wherein the drill bit different with two-stage diameter, wherein being relatively large in diameter is re-drill bit, lesser diameter is pilot bit,
The re-drill bit and the pilot bit are together by a threaded connection, and are drilled out using larger-diameter level-one drill bit and are led eye,
Rock internal stress is discharged, the second level drill bit follow-up broken rock of small diameter is then utilized.
Preferably, the re-drill bit has higher revolving speed than pilot bit, and the re-drill bit and the neck eye bore
When head turns to identical, the re-drill bit revolving speed is higher than the pilot bit revolving speed；The re-drill bit and the pilot bit
When turning to opposite, the additional torque of drill string is reduced, while the matching of the re-drill bit and the pilot bit is optimal,
To carry out fast drilling.
Preferably, the pilot bit is tricone bit, and the re-drill bit for following its mouthful closely is PDC drill bit, is consequently formed
Twin-stage drill bit, and two-stage drill bit axis of rotation is overlapped up and down, the tricone bit and PDC drill bit pass through the regular button of tapered thread
Type connection.
Preferably, the drilling tool comprising the twin-stage double speed drill bit include reducing joint (1), check valve body (2), check (non-return) valve (3),
Outer tube (4), inner tube (5), outer tube box cupling (6), inner tube pipe nipple (7) and concentric type twin-stage double speed PDC drill bit (8) composition, wherein
The reducing joint is connected by screw thread with outer tube (4) and inner tube (5), and in the joint of inner tube (5), setting control drilling fluid is fallen
The check valve body (2) of stream, outer tube (4) lower part connect the outer tube box cupling (6), are located in drill bit outer step, described interior
Pipe (5) top is connect by screw thread with the reducing joint (1), and said inner tube (5) lower part passes through in inner tube pipe nipple (7) and drill bit
Step is connected, and prevents flushing liquor from cutting rates to be flushed to from inner and outer pipes and come into the intracorporal rock core of drill bit, and the outer tube box cupling (6) is logical
It crosses screw thread to be connected with the drill bit, be formed whole.
Preferably, three inlet openings, three apopores are respectively set at the reducing joint (1), and are distributed in 120 degree,
Inlet opening passes to the outer tube (4) and said inner tube (5) gap, and apopore drains into flushing liquor outside drilling tool, effective less rock powder
The blocking of landwaste keeps the concentricity of inner and outer pipes.
Preferably, the concentric type twin-stage double speed PDC drill bit is lateral spray type drill bit.
Preferably, the outer tube (4) uses geology tubing, is free of reamer, and screw thread is arranged in outer tube lower part, and under outer tube
The outer tube box cupling (6) that side accesses with a thickness of 5.5mm.
Preferably, the lap of splice that said inner tube adjusts pipe nipple (7) and drill bit (8) is up to 100mm, and adds hemizygous pipe.
Preferably, the check valve body (2) includes ball valve and ball valve seat, and the ball valve seat passes through screw thread and reducing joint
(1) it connects, the hole that diameter is 20mm is opened at the ball valve seat center, keeps part drilling fluid in drilling process logical from inner tube (5) entrance
It crosses this hole and flow to reducing street corner drainage hole, to smoothly flow out, form local reverse-circulation, when flushing liquor is fashionable from inlet flow, only
Need to overcome ball valve gravity and and the frictional force between valve body, ball valve can be washed open, from outlet flow out；When liquid stream reverse flow
It is fashionable, since the pressure of liquid and the gravity of ball valve are pressed in ball valve closely on ball valve seat, and then prevent drilling fluid water conservancy diversion.
Preferably, using special advanced subland drill, oblique hydrophthalmia out is set on advanced subland drill, so that drilling fluid
Go out from inner and outer pipes (4,5) through drill bit and is flowed out outside the oblique drilling tool of hydrophthalmia.
Beneficial effects of the present invention:
Drill bit of the invention is adapted to the local reverse-circulation double movable double-tube core drill of the difficult coring formation such as loose crushing, will
The landwaste rock powder that its drilling tool formed is carried using flushing liquor reacting cycle has both cast out mistake in the deposition card coring of bottom of inner tube
It goes to launch the program that gets stuck, while strengthening the reliability that rock core card takes, while in check valve and special basket structure
Under assistance, core recovery percentage is effectively increased.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.Target and feature of the invention will be apparent from view of following description taken together with the accompanying drawings,
In attached drawing:
Attached drawing 1 is the concentric type twin-stage double speed PDC drill bit overall structure figure according to the embodiment of the present invention；
Attached drawing 2 is the working principle diagram according to the two-stage drill bit rotating Vortex of the embodiment of the present invention；
Attached drawing 3 is the working principle diagram reversely rotated according to the two-stage drill bit of the embodiment of the present invention；
The drilling tool structure schematic diagram of PDC drill bit according to attached drawing 4 containing the embodiment of the present invention.
Specific embodiment
Concentric type twin-stage double speed PDC drill bit, PDC drill bit is concentric integral type, as shown in Figure 1, wherein having two-stage diameter
Different drill bits, wherein being relatively large in diameter is re-drill bit, lesser diameter is pilot bit, the re-drill bit and the neck
Eye drill bit is together by a threaded connection, and is drilled out using larger-diameter level-one drill bit and is led eye, and rock internal stress is discharged, then sharp
With the second level drill bit follow-up broken rock of small diameter.
Re-drill bit has higher revolving speed than pilot bit, is conducive to the efficiency of breaking rock for improving re-drill bit, drops simultaneously
The broken rock difficulty of low pilot bit improves pilot bit drilling speed.
It is illustrated in figure 2 schematic illustration when two-stage drill bit rotating Vortex, re-drill bit and pilot bit turn to identical
When, when re-drill bit revolving speed is higher than the pilot bit revolving speed, it is conducive to extend the service life of re-drill bit and pilot bit, and
And it is suitable for polymorphic type drill bit and combines.
It is illustrated in figure 3 schematic illustration when two-stage drill bit reversely rotates, re-drill bit and the pilot bit turn to
When opposite, facilitate the additional torque for reducing drill string, while when the matching of re-drill bit and pilot bit is optimal, more favorably
In fast drilling.
From drill bit broken rock principle, twin-stage double speed PDC drill bit and conventional PDC drill bit are all to utilize PDC drill bit plow broken rock,
The drill bit that twin-stage double-speed well drilling tool has two-stage diameter different, is drilled out using larger-diameter level-one drill bit and leads eye, and rock is discharged
Then stone internal stress utilizes the second level drill bit follow-up broken rock of small diameter.Because making bottom rock in level-one drill bit rock break-off process
Stress field changed, the crushing strength of rock reduces, so the efficiency of breaking rock of second level drill bit is improved, to mention
High whole drilling efficiency.
Shaft bottom stress spread region when twin-stage double speed PDC drill bit drilling well is greater than one-stage drill bits could drilling well, and stress concentration is high
In one-stage drill bits could drilling well, level-one drill bit, which drills out, leads eye and makes bottom rock internal stresses release, and rock internal stress is greatly reduced, therefore
Under identical drilling parameter, the efficiency of breaking rock of twin-stage double speed drilling well PDC drill bit is higher than conventional single stage drill bit.
In the present embodiment, pilot bit is tricone bit, and the re-drill bit for following its mouthful closely is PDC drill bit, is consequently formed
Twin-stage drill bit, and two-stage drill bit axis of rotation is overlapped up and down.Tricone bit and PDC drill bit are connected by the regular button-type of tapered thread
It connects.
Referring to fig. 4, the drill bit comprising the twin-stage double speed includes reducing joint 1, check valve body 2, check (non-return) valve 3, outer tube 4, interior
Pipe 5, outer tube box cupling 6, inner tube pipe nipple 7 and concentric type twin-stage double speed PDC drill bit 8, wherein reducing joint passes through screw thread and outer tube 4
It is connected with inner tube 5, the check valve body 2 that setting control drilling fluid is flow backwards in the joint of inner tube 5,4 lower part of outer tube connects external pipe connection
Hoop 6, is located in drill bit outer step, and 5 top of inner tube is connect by screw thread with reducing joint 1, and 5 lower part of inner tube passes through inner tube pipe nipple
7 are connected with step in drill bit, prevent flushing liquor to be flushed to from inner and outer pipes gap and come into the intracorporal rock core of drill bit, outer tube box cupling
6 are connected by screw thread with drill bit, are formed whole.
Three inlet openings, three apopores are respectively set at reducing joint 1, and in 120 degree of distributions, inlet opening passes to outer tube
4 and 5 gap of inner tube, apopore flushing liquor is drained into outside drilling tool, the blocking of effective less rock powder landwaste keeps the concentric of inner and outer pipes
Degree.
In the present embodiment, concentric type twin-stage double speed PDC drill bit is lateral spray type drill bit.It can certainly select other forms
Drill bit.
Outer tube 4 use geology tubing, be free of reamer, outer tube lower part be arranged screw thread, and below outer tube access with a thickness of
The outer tube box cupling 6 of 5.5mm reduces the risk that drilling tool is twisted off to increase torsional property.
Inner tube adjusts pipe nipple 7 and the lap of splice of drill bit 8 is up to 100mm, guarantees that inner tube 5 rotates simultaneously with drill bit 8, in order to
Coring is convenient, prevents column core in inner tube loose, hemizygous pipe can be cooperated to use, and rock core is avoided to take out the artificial damage after earth's surface
It is bad, be conducive to keep original state structure.
Check valve body 2 includes ball valve and ball valve seat, and ball valve seat is connect by screw thread with reducing joint 1, and ball valve seat center is opened
Diameter is the hole of 20mm, so that part drilling fluid is entered through this hole from inner tube 5 and flow to reducing street corner drainage hole, from
And smoothly flow out, form local reverse-circulation.When flushing liquor is fashionable from inlet flow, it is only necessary to overcome the gravity and and and valve of ball valve
Frictional force between body can wash ball valve open, flow out from outlet；When liquid stream reverse flow is fashionable, due to the pressure and ball valve of liquid
Gravity be pressed in ball valve closely on ball valve seat, and then prevent drilling fluid water conservancy diversion.Therefore, if it is interior close 5 block water billiards diameter it is small,
Light weight is easy to cause sphere and hydrophthalmia bad sealing, and during mentioning brill, rock core is easy to fall off, select appropriate quality and
The ball valve of size.Ball valve seat aperture is 20mm, and steel ball size 28mm, material is using 30CrMnSiA.Entire check valve is by hair
Indigo plant processing, to steel ball surface be aoxidized to form fine and close oxide film protection layer, the hard requirement of modulated hardness and connector
Unanimously, while to ball valve sharp angle processing is carried out, it is smooth is allowed to surface circular arc.
Using special advanced subland drill, be arranged on advanced subland drill it is oblique go out hydrophthalmia so that drilling fluid is from inside and outside
Pipe goes out outside the oblique drilling tool of hydrophthalmia through drill bit to flow out, and avoids drilling well also erosion rock core.
The working principle of the drilling tool is drilling tool in normal drilling, and drill bit and inner and outer pipes 4,5 are turned round with drilling rod, are rinsed
Liquid enters drilling rod by water pump, water swivel, until the inlet opening of drilling tool pipe fitting, then passes through the ring-type between inner and outer pipes 4,5
Gap reaches PDC drill bit, flows out to bottom hole through PDC drill bit hydrophthalmia, a part of flushing liquor enters inner tube through bottom hole, through pipe fitting
The turn one's coat gap of hole to drilling rod and hole wall returns to ground again, shunts so that flushing liquor be forced to be formed in bottom hole, causes bottom hole local
Reacting cycle, flushing liquor is walked upwards in inner tube when due to local reverse-circulation drilling, inner tube consistent with the direction that rock core enters inner tube
The circulation of secondary flushing liquor generates uplift pressure to rock core, while eliminating the extruding of drill bit inlet rock core, and core sampler is effectively ensured
Rate, meanwhile, the flushing liquor walked upwards generates certain thrust to rock core, so that rock core can smoothly enter into brill
Has inner tube.
In pipe fitting the above are direct circulation drilling, in pipe fitting, the following are reverse circulation drillings.
Drilling terminates when taking rock core, stops flushing liquor circulation, and the remaining rock powder of flushing liquor is under the effect of gravity in inner tube
It is deposited at 4 bottom of inner tube and drill bit rapidly, takes rock core using the method card that rock powder deposits, eliminate the journey that investment gets stuck
Sequence obtains preferably card and takes effect, is conducive to improve core recovery percentage.
Although the present invention is described by reference to specific illustrative embodiments, these embodiments are not will receive
Restriction and only limited by accessory claim.It should be understood by those skilled in the art that can be without departing from of the invention
Change and modification are able to carry out to the embodiment of the present invention in the case where protection scope and spirit.
Claims (10)
1. a kind of concentric type twin-stage double speed PDC drill bit, it is characterised in that: the PDC drill bit is concentric integral type, wherein having two
The different drill bit of grade diameter, wherein being relatively large in diameter is re-drill bit, it is pilot bit that diameter is lesser, the re-drill bit and
The pilot bit is together by a threaded connection, and is drilled out using larger-diameter level-one drill bit and is led eye, and rock internal stress is discharged,
Then the second level drill bit follow-up broken rock of small diameter is utilized.
2. a kind of concentric type twin-stage double speed PDC drill bit according to claim 1, it is characterised in that: the re-drill bit ratio
Pilot bit has higher revolving speed, when the re-drill bit and the pilot bit turn to identical, the re-drill bit revolving speed
Higher than the pilot bit revolving speed；When the re-drill bit and the pilot bit turn to opposite, the additional torsion of drill string is reduced
Square, while the matching of the re-drill bit and the pilot bit is optimal, to carry out fast drilling.
3. a kind of concentric type twin-stage double speed PDC drill bit according to claim 1, it is characterised in that: the pilot bit is
Tricone bit, the re-drill bit for following its mouthful closely is PDC drill bit, and twin-stage drill bit is consequently formed, and two-stage drill bit rotary shaft up and down
The heart is overlapped, and the tricone bit is connected with PDC drill bit by the regular button-type of tapered thread.
4. a kind of concentric type twin-stage double speed PDC drill bit according to claim 1 to 3, it is characterised in that: comprising described
The drilling tool of concentric type twin-stage double speed PDC drill bit includes reducing joint (1), check valve body (2), check (non-return) valve (3), outer tube (4), inner tube
(5), outer tube box cupling (6), inner tube pipe nipple (7) and concentric type twin-stage double speed PDC drill bit (8) composition, wherein the reducing joint
It is connected by screw thread with outer tube (4) and inner tube (5), the check valve body that setting control drilling fluid is flow backwards in the joint of inner tube (5)
(2), outer tube (4) lower part connects the outer tube box cupling (6), is located in drill bit outer step, said inner tube (5) top passes through
Screw thread is connect with the reducing joint (1), and said inner tube (5) lower part is connected by inner tube pipe nipple (7) with step in drill bit, is prevented
Flushing liquor, which cuts rates to be flushed to from inner and outer pipes, comes into the intracorporal rock core of drill bit, the outer tube box cupling (6) by screw thread with it is described
Drill bit is connected, and is formed whole.
5. concentric type twin-stage double speed PDC drill bit according to claim 4, it is characterised in that: reducing joint (1) punishment
Not She Zhi three inlet openings, three apopores, and in 120 degree be distributed, inlet opening passes to the outer tube (4) and said inner tube (5)
Gap, apopore drain into flushing liquor outside drilling tool, and the blocking of effective less rock powder landwaste keeps the concentricity of inner and outer pipes.
6. concentric type twin-stage double speed PDC drill bit according to claim 4, it is characterised in that: the concentric type twin-stage double speed
PDC drill bit is lateral spray type drill bit.
7. concentric type twin-stage double speed PDC drill bit according to claim 4, it is characterised in that: the outer tube (4) uses geology
Tubing is free of reamer, and screw thread is arranged in outer tube lower part, and the outer tube box cupling (6) with a thickness of 5.5mm is accessed below outer tube.
8. concentric type twin-stage double speed PDC drill bit according to claim 4, it is characterised in that: said inner tube adjusts pipe nipple (7)
It is up to 100mm with the lap of splice of drill bit (8), and adds hemizygous pipe.
9. concentric type twin-stage double speed PDC drill bit according to claim 4, it is characterised in that: the check valve body (2) includes
Ball valve and ball valve seat, the ball valve seat are connect by screw thread with reducing joint (1), and it is 20mm's that diameter is opened at the ball valve seat center
Hole makes in drilling process part drilling fluid enter through this hole from inner tube (5) and flow to reducing street corner drainage hole, to smoothly flow
Out, local reverse-circulation is formed, when flushing liquor is fashionable from inlet flow, it is only necessary to overcome gravity and and the rubbing between valve body of ball valve
Power is wiped, ball valve can be washed open, is flowed out from outlet；When liquid stream reverse flow is fashionable, since the pressure of liquid and the gravity of ball valve make
Ball valve is closely pressed on ball valve seat, and then prevents drilling fluid water conservancy diversion.
10. concentric type twin-stage double speed PDC drill bit according to claim 4, it is characterised in that: the outer step and described interior
Step is special advanced subland drill, be arranged on advanced subland drill it is oblique go out hydrophthalmia so that drilling fluid is from inner and outer pipes (4,5)
Go out outside the oblique drilling tool of hydrophthalmia through drill bit and flows out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910521051.1A CN110374512A (en) | 2019-06-17 | 2019-06-17 | A kind of concentric type twin-stage double speed PDC drill bit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910521051.1A CN110374512A (en) | 2019-06-17 | 2019-06-17 | A kind of concentric type twin-stage double speed PDC drill bit |
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| CN110374512A true CN110374512A (en) | 2019-10-25 |
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Cited By (4)
| 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 |
| CN114278230A (en) * | 2021-12-30 | 2022-04-05 | 库尔勒施得石油技术服务有限公司 | Reverse circulation drill bit |
| CN114718464A (en) * | 2022-03-22 | 2022-07-08 | 中国矿业大学 | Primary hole forming device and method for ground stress test |
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| CN114278230A (en) * | 2021-12-30 | 2022-04-05 | 库尔勒施得石油技术服务有限公司 | Reverse circulation drill bit |
| CN114718464A (en) * | 2022-03-22 | 2022-07-08 | 中国矿业大学 | Primary hole forming device and method for ground stress test |
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Application publication date: 20191025 |