CN110485929A - A kind of drilling underreaming device that can be stretched repeatedly - Google Patents
A kind of drilling underreaming device that can be stretched repeatedly Download PDFInfo
- Publication number
- CN110485929A CN110485929A CN201910833795.7A CN201910833795A CN110485929A CN 110485929 A CN110485929 A CN 110485929A CN 201910833795 A CN201910833795 A CN 201910833795A CN 110485929 A CN110485929 A CN 110485929A
- Authority
- CN
- China
- Prior art keywords
- latch
- pressure
- upper housing
- guide groove
- movable sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 40
- 239000012530 fluid Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011435 rock 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
- 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
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
-
- 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
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/325—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools the cutter being shifted by a spring mechanism
-
- 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
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses the drilling underreaming devices that one kind can stretch repeatedly, belong to enlarging while drilling technical field, comprising: reaming bit, central tube, movable sleeve, pressure pipe, main spring, reset spring, outer housing, build the pressure device；The outer housing includes: upper housing, middle shell, lower case；Upper housing internal circumferential is provided with guide groove and latch, the guide groove is divided into deep guide groove and shallow guide groove, it is separately positioned on circumferentially equally distributed latch both sides, the pressure pipe and the movable sleeve are equipped with mutually engageable latch, and the latch flank of tooth on movable sleeve is slightly above the latch on pressure pipe, so that can cannot be engaged by shallow guide groove with the upper housing latch, by the deep guide groove being set on the upper housing to realize stretching repeatedly for reaming bit；The reaming hole apparatus structure is simple, and hole expansion function, acceptable flexible folding and unfolding reaming bit, to improve reaming efficiency and cementing quality can be not only switched according to ground environment.
Description
Technical field
The present invention relates to enlarging while drilling technical field, especially a kind of drilling underreaming device that can be stretched repeatedly.
Background technique
Enlarging while drilling technology is novel petroleum well drilling technology developed in recent years, and cementing quality not only can be improved,
Drilling efficiency can also be greatly improved, and the drilling underreaming device that can be stretched repeatedly has the function of flexibly opening enlarging while drilling,
The promotion of operating efficiency is then more significant.
In some bad grounds, since the extrusion deformation of rock stratum is serious, conventional drilling mode is easy bit freezing, or under causing
Casing is very difficult, and cementing quality is poor, carrys out big inconvenience for subsequent exploitation work belt, or even causes serious economic damage
It loses.Therefore, enlarging while drilling technology also just arises.Currently, external enlarging while drilling technology is quite mature, and by
It walks to intelligent control direction evolution；And domestic enlarging while drilling technology development is later, though it is completed pair by unremitting effort
The development of various types of drilling underreaming devices and put into be applicable in, but still there are apparatus structure complexity, cannot flexibly control
The disadvantages of reaming opportunity, reaming low efficiency.
To overcome current drilling underreaming device, structure is complicated, cannot flexibly control reaming opportunity, the drawbacks such as reaming low efficiency,
The present invention provides a kind of drilling underreaming device that can be shunk repeatedly, and the apparatus structure is simple, can not only be opened according to ground environment
Close hole expansion function, acceptable flexible folding and unfolding reaming bit, to improve reaming efficiency and cementing quality.
Summary of the invention
The object of the present invention is to provide the drilling underreaming devices that one kind can stretch repeatedly, overcome current drilling underreaming device knot
The drawbacks such as structure complexity, malfunction, reaming low efficiency keep ream operation more flexible using reciprocal telescopic device, reaming effect
Rate significantly improves, while improving cementing quality.
To achieve the above object, the invention adopts the following technical scheme:
The present invention provides a kind of drilling underreaming device that can be stretched repeatedly, comprising: reaming bit, central tube, movable sleeve, pressure
Solenoid, main spring, reset spring, outer housing, O-ring seal, the device that builds the pressure, wing pressing plate, tool joint.
The outer housing includes: upper housing, middle shell, lower case；The upper housing internal circumferential be provided with guide groove and
Latch, the guide groove are divided into deep guide groove and shallow guide groove, are separately positioned on circumferentially equally distributed latch both sides；It is described
Upper housing is connect with the tool joint, the middle housing seal；There are two through-holes for installing institute for setting on the middle shell
State wing pressing plate and the reaming bit；Boss is equipped with inside the lower case, for installing the main spring, and with it is described in
Shell and the tool joint are tightly connected.
The pressure pipe and the movable sleeve are equipped with mutually engageable latch and are installed on inside the upper housing, and institute
The latch that the latch flank of tooth on movable sleeve is slightly above on the pressure pipe is stated, so that can be by being set on the upper housing
Deep guide groove cannot be engaged by shallow guide groove with the upper housing latch, described in the latch entrance on the movable sleeve
When deep guide groove on upper housing, reaming bit, which is in, to be shunk；When the latch on the movable sleeve is by shallow on the upper housing
When guide groove limits, the latch on the movable sleeve becomes at a fully engaged with engaging for the pressure pipe latch, the reamer
Head stretches out, and is in reaming working condition.
The device that builds the pressure includes: pressure ball, control sliding block and connecting key；The control sliding block by the connecting key with
The pressure pipe connection, the pressure ball are put by well head, fall between the control sliding block and form throttle effect, make the pressure
Power ball forms pressure difference up and down, and pressure pipe downlink under the action of pressure difference, the control sliding block is by connecting key along setting
It is moved radially in the wedge groove of the upper housing relative to the upper housing, until wedge groove bottom, the control sliding block are complete
It opens, the safe ball falls into the center bottom of the tube.
It is described build the pressure device be in build the pressure state when, the pressure ball up and down generate pressure difference the thrust of pressure pipe is greater than
The main spring is to the thrust of the central tube, so that pressure pipe can move down；After release, the main spring is to the center
The thrust of pipe is greater than top drilling fluid to the lower pressure of internal component so that under the promotion of main spring, central tube can on
It moves.
The movable sleeve is installed below the pressure pipe, and when installation, the upper tool joint and top rod sealing connect
It connects, the lower tool joint and lower part drilling rod are tightly connected, the depth on latch side wall and the upper housing on the movable sleeve
It is oriented to groove sidewall cooperation, therefore the latch on the movable sleeve and the latch on the pressure pipe are in semi-engagement state, described
Under the promotion of pressure pipe, the movable sleeve is along guide groove downlink, until the upper housing guiding groove sidewall and the movable sleeve deeply
On the cooperation of latch side wall terminate, uplink and certain angle is turned under the thrust for being actively set on the main spring, with institute
The engagement for stating pressure pipe latch becomes at a fully engaged.
The central tube top is flexibly connected with the movable sleeve, and is provided with type conical bench, rotary table and drilling fluid runner,
Under the promotion of the movable sleeve, the central tube downlink, the inclined-plane on the type conical bench inclined-plane and the reaming bit bottom
Cooperation, and the reaming bit is released along the wing pressing plate, until reaming bit is completely pushed out of, the type conical bench is flat
Face and the drill bit bottom plane cooperate；The main spring is connected respectively at the rotary table with the inside of the lower case, in institute
When stating central tube downlink, the main spring is pressurized, when the upper housing guiding groove sidewall and the movable sleeve latch side wall deeply
At the end of cooperation, the pressure ball falls into the center-pole bottom, the pressure differential collapses, under the thrust of the main spring, institute
Central tube uplink is stated, the movable sleeve uplink is pushed and the latch on the pressure pipe turns over certain angle, due to the work
The dynamic upper latch of set cannot be fully mated by the shallow guide groove on the upper housing and the latch on the upper housing, described
Reaming bit is ejected completely, and by Complete Bind, drilling fluid can spray auxiliary ream operation at this time.
The wing pressing plate is connected by screw to on the concave station of the middle shell, and the reaming bit is installed on the knife
In the through-hole of wing pressing plate, described reset spring one end connect one end with the groove being set on the wing pressing plate and is set to institute
The spring stop connection of reaming bit bottom is stated, in ream operation, the reset spring is pressurized.
When the reaming bit needs to be reset, pressure ball is put into again from well head, the pressure on the pressure ball top is greater than
The pressure of lower part, under the action of pressure difference, the pressure pipe is moved down, and pushes the movable sleeve downlink, until the movable sleeve
On latch and the upper housing on latch cooperate and disconnect, the control sliding block fully opens, described in the safe ball is fallen into
Center-pole bottom, the pressure differential collapses, in the main spring under the promotion of the central tube, the movable sleeve will be in the pressure
Certain angle and uplink are turned in solenoid under the limitation of latch, continued to rotate under the latch limitation on the upper housing and on
Row, until latch moves to topmost completely into the deep guide groove on the upper housing, the press rods, the control sliding block
It resets；During the central tube uplink, the reaming bit bottom bevel again with the taper platform on the central tube
The cooperation of rank inclined-plane, the reaming bit reset under the action of the reset spring, reaming operation.
Latch in the press rods, the latch on the movable sleeve, the latch on the upper housing and guide groove are
Be uniformly distributed along the circumference arrangement, guide groove of the latch on the latch on the pressure pipe and the movable sleeve on the upper housing,
Under the limitation of latch, under ream operation state and it is in semi-engagement state under dormant state, so that on the movable sleeve
When guide groove on latch and the upper housing cooperates disengaging, the movable sleeve meeting uplink, and certain angle is turned over, to realize
The cooperation of deep, the shallow guide groove on latch and the upper housing on the movable sleeve switches, and then realizes the anti-of reaming bit
It is multiple flexible.During the movable sleeve rotates a circle, the reaming bit can stretch four times.
Technical solution of the present invention is further illustrated with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the shape assumption diagram for the drilling underreaming device that one kind of the present invention can stretch repeatedly；
Fig. 2 is the sectional view of Section A-A in Fig. 1；
Fig. 3 is the sectional view of section B-B in Fig. 1；
Fig. 4 is the partial enlarged view in Fig. 2 at C；
Here is the explanation marked in Figure of description:
(1) tool joint (3) controls sliding block on pressure ball (2)
(4) connecting key (5) pressure pipe (6) upper housing
(7) O-ring seal (8) movable sleeve (9) central tube
(10) shell (11) wing pressing plate (12) reaming bit in
(13) tool joint under main spring (14) lower case (15)
(16) reset spring
Specific embodiment
The drilling underreaming device that can be stretched repeatedly below in conjunction with attached drawing to one kind of the present invention is explained in detail.
When installation, upper tool joint (2) and top rod are tightly connected, and lower tool joint (15) and the sealing of lower part drilling rod connect
Connect, the deep guiding groove sidewall cooperation on the latch side wall on movable sleeve (8) and upper housing (6), thus on movable sleeve (8) latch
It is in semi-engagement state with the latch on pressure pipe (5).When needing to carry out ream operation, control is fallen into from well head investment pressure ball (1)
Throttle effect is formed between sliding block (3) processed, so that pressure ball (1) is formed pressure difference up and down, under pressure pipe (5) is under the action of pressure difference
Row, control sliding block (3) is moved radially by connecting key (4) along the wedge groove being set on upper housing (6), until wedge groove
Bottom, control sliding block (3) fully open, and safe ball (1) falls into central tube (9) bottom.Under the promotion of pressure pipe (5), movable sleeve
(8) along guide groove downlink, until the cooperation knot of deep guiding groove sidewall and the latch side wall on movable sleeve (8) on upper housing (6)
Beam, since safe ball (1) is fallen, pressure differential collapses, movable sleeve (8) uplink and turns over certain angle under the thrust of main spring (13)
Degree, becomes at a fully engaged with engaging for latch on pressure pipe (5).In the process.Central tube (9) downlink, type conical bench inclined-plane
Cooperate with the inclined-plane of reaming bit (12) bottom, and reaming bit (12) is released along wing pressing plate (11), until reaming bit
(12) it is completely pushed out of.
In central tube (9) downlink, the main spring is pressurized, since safe ball (1) is fallen, pressure differential collapses, in main spring
(13) under thrust, central tube (9) uplink, pushes movable sleeve (8) uplink and the latch on pressure pipe (5) turns over certain angle
Degree, since the latch on movable sleeve (8) cannot be complete by the shallow guide groove on upper housing (6) and the latch on upper housing (6)
Full cooperation, is set to the drilling fluid runner inside type conical bench at this time and is aligned with reaming bit (12) inner flow passage, drilling fluid can
To pass through, ream operation starts.
When not needing to carry out ream operation, put into again from well head pressure ball (1), the pressure on pressure ball (1) top is greater than
The pressure of lower part, under the action of pressure difference, pressure pipe (5) is moved down, and pushes movable sleeve (8) downlink, until on movable sleeve (8)
Latch on latch and upper housing (6), which cooperates, to be disconnected, and is controlled sliding block (3) along the wedge groove being set on upper housing (6) and is made diameter
To movement, until wedge groove bottom, control sliding block (3) is fully opened, and safe ball (1) falls into the center bottom of the tube, pressure differential collapses,
In main spring (13) under the promotion of the central tube (9), movable sleeve (8) will turn under the limitation of latch on pressure pipe (5)
Certain angle and uplink continue to rotate simultaneously uplink under the latch limitation on upper housing (6), until latch is completely into upper housing
(6) deep guide groove, pressure pipe (5) on move to topmost, and control sliding block (3) resets；In the process of central tube (9) uplink
In, reaming bit (12) bottom bevel cooperates with the type conical bench inclined-plane on central tube (9) again, and reaming bit (12) is resetting
Spring resets under the action of (16), reaming operation.
Latch on pressure pipe (5), the latch on movable sleeve (8), the latch on upper housing (6) and guide groove are along circle
Zhou Junbu arrangement, during movable sleeve (8) rotates a circle, reaming bit (12) can stretch four times.
Claims (6)
1. the invention discloses the drilling underreaming devices that one kind can stretch repeatedly, comprising: reaming bit, central tube, movable sleeve, pressure
Solenoid, main spring, reset spring, outer housing, build the pressure device；The outer housing includes: upper housing, middle shell, lower case, described
Tool joint includes: upper tool joint and lower tool joint；The upper housing and the upper tool joint, the middle shell screw thread
Connection；The lower case is connect with the middle shell, the lower tool joint thread；The device that builds the pressure includes: pressure ball, control
Sliding block and connecting key processed；The control sliding block is connect by the connecting key with the pressure pipe, and the central tube is installed on institute
It states below movable sleeve, the pressure pipe is circumferentially positioned by the keyway progress being set on outer housing with central tube, and can edge
Keyway moves up and down；The movable sleeve is installed between the pressure pipe and the central tube, and the wing pressing plate passes through spiral shell
Nail is connected on the concave station of the middle shell, and the reaming bit is installed in the through-hole of the wing pressing plate, the reset bullet
Spring one end connect one end with the groove being set on the wing pressing plate and is set to the spring stop of the reaming bit bottom
Connection, the main spring are connected respectively at the rotary table with the inside of the lower case.
2. the drilling underreaming device described in claim 1 that can be stretched repeatedly, it is characterised in that: the upper housing internal circumferential is set
It is equipped with guide groove and latch, the guide groove is divided into deep guide groove and shallow guide groove, is separately positioned on circumferentially equally distributed
Latch both sides；The pressure pipe and the movable sleeve are equipped with mutually engageable latch and are installed on inside the upper housing, and
The latch flank of tooth on the movable sleeve is slightly above the latch on the pressure pipe, so that can be by being set on the upper housing
Deep guide groove, cannot be engaged by shallow guide groove with the upper housing latch；When the latch on the movable sleeve enters institute
When stating the deep guide groove on upper housing, reaming bit, which is in, to be shunk；When the latch on the movable sleeve is by the upper housing
When shallow guide groove limitation, the latch on the movable sleeve becomes at a fully engaged with engaging for the pressure pipe latch, the reaming
Drill bit stretches out, and is in reaming working condition.
3. the drilling underreaming device described in claim 1 that can be stretched repeatedly, it is characterised in that: the control sliding block passes through connection
Key can be moved radially along the wedge groove for being set to the upper housing relative to the upper housing, until wedge groove bottom, is being pressed
Power ball just in place when, the control sliding block is in close state at the top of the wedge groove, thus realize build the pressure, make the pressure
Pressure above ball is greater than the pressure of lower section, the pressure pipe downlink；It is described when the control slide block movement to wedge groove bottom
It is in the open state to control sliding block, so that the pressure ball can fall, completes release.
4. the drilling underreaming device described in claim 1 that can be stretched repeatedly, it is characterised in that: in build the pressure state when, it is described
The pressure difference that pressure ball generates up and down is greater than the main spring to the thrust of the central tube, so that pressure to the thrust of pressure pipe
Pipe can move down；After release, the main spring is greater than pushing of the top drilling fluid to internal component to the thrust of the central tube
Power, so that central tube can move up under the promotion of main spring.
5. the drilling underreaming device described in claim 1 that can be stretched repeatedly, it is characterised in that: the central tube is provided with taper
Step, rotary table and drilling fluid runner, the reaming bit can radially be stretched under the promotion of the type conical bench relative to middle shell
Out, and finally it is aligned with the drilling fluid runner being set to inside type conical bench with reaming bit inside stream, the reaming bit is complete
It is ejected entirely, and by Complete Bind, drilling fluid can spray auxiliary ream operation at this time.
6. the drilling underreaming device described in claim 1 that can be stretched repeatedly, it is characterised in that: latch on the pressure pipe with
Latch on the movable sleeve under ream operation state and stops shape under the limitation of guide groove, latch on the upper housing
It is in semi-engagement state under state, is detached from so that the latch on the movable sleeve and the guide groove on the upper housing cooperate
When, the movable sleeve meeting uplink, and certain angle is turned over, to realize on the latch and the upper housing on the movable sleeve
The cooperation switching of deep, shallow guide groove, and then realize stretching repeatedly for reaming bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910833795.7A CN110485929A (en) | 2019-09-04 | 2019-09-04 | A kind of drilling underreaming device that can be stretched repeatedly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910833795.7A CN110485929A (en) | 2019-09-04 | 2019-09-04 | A kind of drilling underreaming device that can be stretched repeatedly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110485929A true CN110485929A (en) | 2019-11-22 |
Family
ID=68556529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910833795.7A Pending CN110485929A (en) | 2019-09-04 | 2019-09-04 | A kind of drilling underreaming device that can be stretched repeatedly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110485929A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2432376A (en) * | 2005-11-17 | 2007-05-23 | Paul Bernard Lee | Ball-activated mechanism for controlling the operation of a downhole tool |
| CN101657601A (en) * | 2006-12-04 | 2010-02-24 | 贝克休斯公司 | Be used to the expansible reamer of application with boring |
| CN102654024A (en) * | 2012-03-13 | 2012-09-05 | 中国海洋石油总公司 | Hydraulic chambering device for drilling |
| CN202673146U (en) * | 2012-06-06 | 2013-01-16 | 宝鸡石油机械有限责任公司 | Expanding type ball-throwing structure for reamer while drilling |
| CN103046871A (en) * | 2012-12-30 | 2013-04-17 | 中北大学 | Hydra-mechanical reducing bit broaching while drilling |
| CN103615196A (en) * | 2013-12-12 | 2014-03-05 | 西南石油大学 | Plunger type significantly-variable-diameter reaming-while-drilling tool |
| CN108756753A (en) * | 2018-07-23 | 2018-11-06 | 长江大学 | A kind of drilling underreaming device that can be stretched repeatedly |
| CN108843244A (en) * | 2018-06-04 | 2018-11-20 | 中石化石油工程技术服务有限公司 | Underground primacord explosion expanding method |
-
2019
- 2019-09-04 CN CN201910833795.7A patent/CN110485929A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2432376A (en) * | 2005-11-17 | 2007-05-23 | Paul Bernard Lee | Ball-activated mechanism for controlling the operation of a downhole tool |
| US7673708B2 (en) * | 2005-11-17 | 2010-03-09 | Paul Bernard Lee | Ball-activated mechanism for controlling the operation of a downhole tool |
| CN101657601A (en) * | 2006-12-04 | 2010-02-24 | 贝克休斯公司 | Be used to the expansible reamer of application with boring |
| CN102654024A (en) * | 2012-03-13 | 2012-09-05 | 中国海洋石油总公司 | Hydraulic chambering device for drilling |
| CN202673146U (en) * | 2012-06-06 | 2013-01-16 | 宝鸡石油机械有限责任公司 | Expanding type ball-throwing structure for reamer while drilling |
| CN103046871A (en) * | 2012-12-30 | 2013-04-17 | 中北大学 | Hydra-mechanical reducing bit broaching while drilling |
| CN103615196A (en) * | 2013-12-12 | 2014-03-05 | 西南石油大学 | Plunger type significantly-variable-diameter reaming-while-drilling tool |
| CN108843244A (en) * | 2018-06-04 | 2018-11-20 | 中石化石油工程技术服务有限公司 | Underground primacord explosion expanding method |
| CN108756753A (en) * | 2018-07-23 | 2018-11-06 | 长江大学 | A kind of drilling underreaming device that can be stretched repeatedly |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191122 |