CN110107243A - Electric-liquid type down-hole casing hole making drill - Google Patents
Electric-liquid type down-hole casing hole making drill Download PDFInfo
- Publication number
- CN110107243A CN110107243A CN201910326445.1A CN201910326445A CN110107243A CN 110107243 A CN110107243 A CN 110107243A CN 201910326445 A CN201910326445 A CN 201910326445A CN 110107243 A CN110107243 A CN 110107243A
- Authority
- CN
- China
- Prior art keywords
- runner
- hydraulic
- directional control
- control valve
- solenoid directional
- 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
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
Abstract
The invention belongs to industrial gas oil completion technique fields, more particularly, to a kind of electric-liquid type down-hole casing hole making drill, it is characterized by comprising ground systems, the electrohydraulic dynamic unit being connected by cable with this ground system, the aperture unit being connected with this electrohydraulic dynamic unit, electrohydraulic dynamic unit includes support frame, fuel tank, motor, hydraulic pump, the overflow valve being connected with the hydraulic pump, it is connected with this overflow valve output end, and the solenoid directional control valve I and solenoid directional control valve II being arranged in parallel, aperture unit includes being equipped with runner A, runner B, the unit main body of tetra- runners of runner C and runner D, hydraulic motor, the piston bush being connect with motor output shaft by spline, the drill bit being threadedly coupled with this piston bush, pressure cap.The present invention passes through cable to downhole transmitted electric energy from ground, and underground hole making drill drives bit to cut casing, realize casing pipe hole opening from translator and hydraulic power system, provides condition to implement next step operation.
Description
Technical field
The invention belongs to industrial gas oil completion technique fields, more particularly, to a kind of electric-liquid type down-hole casing aperture
Device.
Background technique
In oil and gas exploration and development process, it is often necessary to drive well inner sleeve brill into row stratum and survey pressure, water squeezing
The construction operations such as mud and pressure break.Currently used casing pipe hole opening mode is gunpowder perforation, but the generally existing casing of perforating modes damages
It is bad, the problems such as eyelet is irregular.In addition, country is to gunpowder class product at present because being related to the policy implications such as safety management, environmental protection
Control is stringent, and examination & approval and allotment process are tediously long, and the casing pipe hole opening mode of conventional gunpowder perforation is restricted.
Summary of the invention
The object of the present invention is to provide one kind can be realized casing pipe hole opening, it is regular to make casing eyelet, and can guarantee that casing is complete
Whole property will not damage cement sheath and cause water breakthrough, without dangerous material such as explosives, solve the insufficient electricity of current gunpowder aperture mode
Liquid formula down-hole casing hole making drill.
The purpose of the present invention is what is realized by following technical proposals:
Electric-liquid type down-hole casing hole making drill of the invention, it is characterised in that including ground system, pass through cable and this ground
The electrohydraulic dynamic unit that system is connected, the aperture unit being connected with this electrohydraulic dynamic unit,
The electrohydraulic dynamic unit includes support frame, and the fuel tank on this support frame is arranged in, and motor passes through with this motor
Shaft coupling is connected and the hydraulic pump on support frame as described above is arranged in, be arranged on support frame as described above and is connected with the hydraulic pump
The overflow valve connect, the solenoid directional control valve I for being connected and being arranged in parallel with this overflow valve output end and solenoid directional control valve II, it is described
Hydraulic pump be connected by hydraulic tube I with the fuel tank,
The aperture unit includes the unit main body equipped with runner A, tetra- runner B, runner C and runner D runners, with this
The hydraulic motor that unit main body is connected by screw to passes through the piston bush of connection with the motor output shaft of this hydraulic motor, with this
The drill bit that piston bush is threadedly coupled, is threadedly coupled with the unit main body and is arranged in the pressure cap of the drill bit end point, described
The inlet port of hydraulic motor is connected by hydraulic tube II with the runner A, and the oil return opening of the hydraulic motor passes through hydraulic
Pipe III is connected with the runner B,
Two delivery outlets of solenoid directional control valve I are connected with the runner A and runner B respectively by hydraulic tube, electromagnetism
Two delivery outlets of reversal valve II are connected with the runner C and runner D respectively by hydraulic tube,
The piston is set in the step duct of the unit main body, the piston bush, unit main body and
Pressure cap is divided into hydraulic cavities I and hydraulic cavities II, the hydraulic cavities I to pass through the runner C and the electricity by three groups of dynamic sealings
Magnetic reversal valve II is connected, and the hydraulic cavities II is connected by the runner D with the solenoid directional control valve II.
The solenoid directional control valve I is two position and four-way reversing valves.
The solenoid directional control valve II is three position four-way directional control valve.
The drill bit is hard alloy or high-speed tool steel material.
Advantages of the present invention:
(1) electric-liquid type down-hole casing hole making drill of the invention passes through cable to downhole transmitted electric energy, underground aperture from ground
Device drives bit to cut casing, realizes casing pipe hole opening from translator and hydraulic power system, to implement next step operation
Provide condition；
(2) electric-liquid type down-hole casing hole making drill of the invention does not need the explosions such as gunpowder danger using power transmission and driving
Dangerous product, it is safe and environment-friendly, pollution-free；
(3) electric-liquid type down-hole casing hole making drill of the invention drills casing, the eyelet rule of formation using machine cut mode
Then, casing will not be damaged；
(4) electric-liquid type down-hole casing hole making drill of the invention, will not destroy cement sheath and cause water breakthrough, operational risk
It is small.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of electrohydraulic dynamic unit of the present invention.
Fig. 3 is the structure schematic diagram of aperture unit of the present invention.
Fig. 4 is the schematic diagram of electrohydraulic dynamic unit of the present invention.
Fig. 5 is the structural schematic diagram that motor output shaft of the present invention is connect with piston bush.
Fig. 6 is the structural schematic diagram of casing pipe hole opening process of the present invention.
Specific embodiment
A specific embodiment of the invention is further illustrated with reference to the accompanying drawing.
As shown in figures 1 to 6, electric-liquid type down-hole casing hole making drill of the invention, it is characterised in that including ground system 1, pass through
The electrohydraulic dynamic unit 3 that cable 2 is connected with this ground system 1, the aperture unit 4 being connected with this electrohydraulic dynamic unit 3,
The electrohydraulic dynamic unit 3 includes support frame 36, is arranged in the fuel tank 30 on this support frame 36, motor 32, with
This motor 32 is connected by shaft coupling 33 and the hydraulic pump 34 on support frame as described above 36 is arranged in, and is arranged in support frame as described above 36
Overflow valve 35 that is upper and being connected with the hydraulic pump 34, the electromagnetism for being connected and being arranged in parallel with this 35 output end of overflow valve
Reversal valve I 37 and solenoid directional control valve II 38, the hydraulic pump 34 are connected by hydraulic tube I 31 with the fuel tank 30,
The aperture unit includes the unit main body 40 equipped with runner A, tetra- runner B, runner C and runner D runners, with
This element main body 40 passes through the hydraulic motor 43 that screw 46 connects, and connect with 44 spline of motor output shaft of this hydraulic motor 43
Piston bush 45, the drill bit 48 being threadedly coupled with this piston bush 45 are threadedly coupled with the unit main body 40 and are arranged in the brill
The inlet port of the pressure cap 47 of first 48 end point, the hydraulic motor 43 is connected by hydraulic tube II 41 with the runner A,
The oil return opening of the hydraulic motor 43 is connected by hydraulic tube III42 with the runner B,
Two delivery outlets of solenoid directional control valve I 37 are connected with the runner A and runner B respectively by hydraulic tube, electricity
Two delivery outlets of magnetic reversal valve II 38 are connected with the runner C and runner D respectively by hydraulic tube,
The piston bush 45 is arranged in the step duct of the unit main body 40, the piston bush 45, unit
Main body 40 and pressure cap 47 are divided into hydraulic cavities I and hydraulic cavities II, the hydraulic cavities I to pass through the runner C by three groups of dynamic sealings
It is connected with the solenoid directional control valve II 38, the hydraulic cavities II passes through the runner D and the solenoid directional control valve II
38 are connected.
The solenoid directional control valve I 37 is two position and four-way reversing valves.
The solenoid directional control valve II 38 is three position four-way directional control valve.
The drill bit 48 is hard alloy or high-speed tool steel material.
The present invention from ground system 1 by cable 2 to downhole transmitted electric energy, underground hole making drill is from translator and hydraulic power
System drives 48 rotary cutting casing of drill bit, realizes casing pipe hole opening, provides condition to implement next step operation.Motor 32
It is being driven by electricity lower generation torque and revolving speed, is providing driving source for instrument, support frame 36 is a support frame structure, is pacified above
Hydraulic pump 34, overflow valve 35, solenoid directional control valve I37 and solenoid directional control valve II 38 etc. are filled, 33 both ends of shaft coupling are separately connected motor
32 output shaft and the input shaft of hydraulic pump 34, and allow the two presence not coaxial, the connection hydraulic pump 34 of hydraulic tube I 31 and oil
Case 30, hydraulic tube I 31 are hollow metal tube or other types pipeline, and middle flow hydraulic oil, overflow valve 35 is hydraulic system
Constant pressure protection element, it is ensured that system oil pressure can be stablized in a setting value, and solenoid directional control valve I 37 is a kind of " two four-way "
Reversal valve has two kinds of " II ", " 0 " type functions, and solenoid directional control valve II 38 is a kind of " 3-position 4-way " reversal valve, have " II ",
" 0 ", three kinds of functions of " X " type, are able to achieve three kinds of different oil pressure output states.35 output end of overflow valve is divided into two-way, an oil
Road enters solenoid directional control valve II 38, electromagnetism by hydraulic tube by hydraulic tube and the connection of solenoid directional control valve I 37, another oil circuit
Reversal valve I 37 and solenoid directional control valve II 38 are in parallel, and two delivery outlets of solenoid directional control valve I 37 are separately connected by hydraulic tube
Runner A and runner B on to aperture unit 4.
The unit main body 40 of aperture unit 4 is the carrier of aperture unit, is equipped with tetra- runners of A, B, C, D above, electro-hydraulic
The hydraulic oil of power unit 3 is connected to the inlet port of hydraulic motor 43, electrohydraulic dynamic unit 3 by runner A, hydraulic tube II 41
Hydraulic oil the oil return opening of hydraulic motor 43 is connected to by runner B, hydraulic tube III42, hydraulic motor 43 passes through one group of screw
46 are fixed in unit main body 40, and motor output shaft 44 and piston bush 45 form spline drived, can while transmitting torque,
It does not influence piston bush 45 to be axially moveable, piston bush 45 is placed in the step duct of unit main body 40, piston bush 45 and list
First main body 40 and pressure cap 47 are divided into hydraulic cavities I and hydraulic cavities II by three groups of dynamic sealings, and hydraulic cavities I passes through runner C and electromagnetism
Reversal valve II 38 is connected, and hydraulic cavities II is connected by runner D with solenoid directional control valve II 38.Pressure cap 47 is connected through a screw thread
Onto unit main body 40, piston bush 45 is limited in the hydraulic cavities of unit main body 40,48 material selection hard alloy of drill bit or
High-speed tool steel is threadedly attached on piston bush 45, chip and can drill casing.
The course of work of the invention is as follows: 32 output torque of motor and revolving speed are transmitted to hydraulic pump 34, liquid through shaft coupling 33
Press pump 34 forms oil pressure, makes its stabilization by 35 pressure regulation of overflow valve, then an oil circuit enters solenoid directional control valve I 37, when electromagnetism changes
When being located at " II " function to valve I 37, hydraulic oil enters the runner A on aperture unit 4, and driving hydraulic motor 43 runs, opens at this time
Hole unit is in aperture state, and when solenoid directional control valve I 37 is located at " 0 " function, hydraulic oil does not circulate, and remains static, and overflows
Another oil circuit that stream valve 35 exports enters solenoid directional control valve II 38, when solenoid directional control valve II 38 is located at " II " function, liquid
Pressure oil enters the runner C on aperture unit 4, is now in aperture state, when solenoid directional control valve II 38 is located at " 0 " function, this
When remain static, when solenoid directional control valve II 38 is located at " X " function, be now in reset state.
When 3 output hydraulic pressure oil of electrohydraulic dynamic unit enters hydraulic motor 43 through the runner A in unit main body 40 and drives it
Operation, is then back to electrohydraulic dynamic unit 3 by runner B, 44 output torque of motor output shaft and revolving speed are transmitted to piston bush
45, and then be transmitted on drill bit 48, torque is provided to drill casing, another oil pressure of electrohydraulic dynamic unit 3 is through electromagnetism at this time
Reversal valve II 38 enters runner C and hydraulic cavities I, and piston bush 45 is pushed to move right under rotation status, provides brill for drill bit 48
The hydraulic oil of pressure, hydraulic cavities II returns to electrohydraulic dynamic unit 3 through runner D, and the windowing bit pressure of drill bit 48 is Δ P × A, and Δ P is
The pressure difference of hydraulic cavities I and hydraulic cavities II, A are the hydraulic effective active areas on piston bush 45, and drill bit 48 is in bit pressure and torsion
Square acts on lower cutting casing, implements aperture operation；After drill bit 48 drills casing, the solenoid directional control valve II of electrohydraulic dynamic unit 3
38 are switched to " X " function, and hydraulic oil enters hydraulic cavities II by runner D and piston bush 45 and drill bit 48 is pushed to be moved to the left, hydraulic
The hydraulic oil of chamber I returns to electrohydraulic dynamic unit 3 by runner C, until after piston bush 45 resets completely, solenoid directional control valve II
38 are switched to middle position " 0 " function, lock piston set 45 and drill bit 48, while the solenoid directional control valve I 37 of electrohydraulic dynamic unit 3 is cut
Middle position " 0 " function is changed to, hydraulic motor 43 is out of service, and motor 32 is out of service, so far completes a casing pipe hole opening operation.
Electric-liquid type down-hole casing hole making drill of the invention passes through cable 2 to downhole transmitted electric energy, underground from ground system 1
Hole making drill drives 48 rotary cutting casing of drill bit, realizes casing pipe hole opening from translator 32 and hydraulic power system, under implementing
One-shot job provides condition；Electric-liquid type down-hole casing hole making drill of the invention does not need gunpowder using power transmission and driving
Equal Explosive hazardous materials, it is safe and environment-friendly, pollution-free；Casing is drilled using machine cut mode, the eyelet rule of formation will not damage
Bad casing will not destroy cement sheath and cause water breakthrough, and operational risk is small.
Claims (4)
1. a kind of electric-liquid type down-hole casing hole making drill, it is characterised in that including ground system, pass through cable and this ground system phase
The electrohydraulic dynamic unit of connection, the aperture unit being connected with this electrohydraulic dynamic unit,
The electrohydraulic dynamic unit includes support frame, and the fuel tank on this support frame is arranged in, and motor passes through shaft coupling with this motor
Device is connected and the hydraulic pump on support frame as described above is arranged in, and is arranged on support frame as described above and is connected with the hydraulic pump
Overflow valve, the solenoid directional control valve I and solenoid directional control valve II for being connected and being arranged in parallel with this overflow valve output end, the liquid
Press pump is connected by hydraulic tube I with the fuel tank,
The aperture unit includes the unit main body equipped with runner A, tetra- runner B, runner C and runner D runners, with this element
The hydraulic motor that main body is connected by screw to, the piston bush being connect with the motor output shaft spline of this hydraulic motor, with this piston
The drill bit of external threading connection, is threadedly coupled with the unit main body and is arranged in the pressure cap of the drill bit end point, described hydraulic
The inlet port of motor is connected by hydraulic tube II with the runner A, and the oil return opening of the hydraulic motor passes through hydraulic tube III
It is connected with the runner B,
Two delivery outlets of solenoid directional control valve I are connected with the runner A and runner B respectively by hydraulic tube, electromagnetic switch
Two delivery outlets of valve II are connected with the runner C and runner D respectively by hydraulic tube,
The piston is set in the step duct of the unit main body, the piston bush, unit main body and pressure cap
Hydraulic cavities I and hydraulic cavities II are divided by three groups of dynamic sealings, the hydraulic cavities I are changed by the runner C with the electromagnetism
It is connected to valve II, the hydraulic cavities II are connected by the runner D with the solenoid directional control valve II.
2. electric-liquid type down-hole casing hole making drill according to claim 1, it is characterised in that the solenoid directional control valve I is two
Position and four-way reversing valve.
3. electric-liquid type down-hole casing hole making drill according to claim 1, it is characterised in that the solenoid directional control valve II is
Three position four-way directional control valve.
4. electric-liquid type down-hole casing hole making drill according to claim 1, it is characterised in that the drill bit is hard alloy
Or high-speed tool steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910326445.1A CN110107243A (en) | 2019-04-23 | 2019-04-23 | Electric-liquid type down-hole casing hole making drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910326445.1A CN110107243A (en) | 2019-04-23 | 2019-04-23 | Electric-liquid type down-hole casing hole making drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110107243A true CN110107243A (en) | 2019-08-09 |
Family
ID=67486153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910326445.1A Pending CN110107243A (en) | 2019-04-23 | 2019-04-23 | Electric-liquid type down-hole casing hole making drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110107243A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114922581A (en) * | 2022-05-27 | 2022-08-19 | 重庆科技学院 | Underground casing continuous hole forming device and working method thereof |
| CN115405265A (en) * | 2022-07-06 | 2022-11-29 | 重庆科技学院 | Electrically-driven underground casing continuous hole drilling device and working method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2426520Y (en) * | 2000-05-19 | 2001-04-11 | 江汉石油管理局采油工艺研究院 | Borehole slotting device |
| US20020020562A1 (en) * | 2000-08-21 | 2002-02-21 | Baird Billy Carr | Boring apparatus |
| CN202000941U (en) * | 2011-04-20 | 2011-10-05 | 中国石油天然气股份有限公司 | Underground sleeving wall punching device for oil well |
| CN103195387A (en) * | 2013-04-16 | 2013-07-10 | 中国石油集团渤海钻探工程有限公司 | Downhole radial casing window opener |
| CN103334711A (en) * | 2013-06-17 | 2013-10-02 | 中国石油集团长城钻探工程有限公司 | Electronically-controlled underground casing windowing tool |
| CN204152468U (en) * | 2014-10-17 | 2015-02-11 | 北方斯伦贝谢油田技术（西安）有限公司 | A kind of metal tube boring device |
| CN104695886A (en) * | 2015-01-26 | 2015-06-10 | 中国石油集团渤海钻探工程有限公司 | Zero-radius down-hole casing drilling device and drilling method thereof |
| CN205805472U (en) * | 2016-03-26 | 2016-12-14 | 库尔班·卡斯木 | A kind of machinery down-hole drilling device |
-
2019
- 2019-04-23 CN CN201910326445.1A patent/CN110107243A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2426520Y (en) * | 2000-05-19 | 2001-04-11 | 江汉石油管理局采油工艺研究院 | Borehole slotting device |
| US20020020562A1 (en) * | 2000-08-21 | 2002-02-21 | Baird Billy Carr | Boring apparatus |
| CN202000941U (en) * | 2011-04-20 | 2011-10-05 | 中国石油天然气股份有限公司 | Underground sleeving wall punching device for oil well |
| CN103195387A (en) * | 2013-04-16 | 2013-07-10 | 中国石油集团渤海钻探工程有限公司 | Downhole radial casing window opener |
| CN103334711A (en) * | 2013-06-17 | 2013-10-02 | 中国石油集团长城钻探工程有限公司 | Electronically-controlled underground casing windowing tool |
| CN204152468U (en) * | 2014-10-17 | 2015-02-11 | 北方斯伦贝谢油田技术（西安）有限公司 | A kind of metal tube boring device |
| CN104695886A (en) * | 2015-01-26 | 2015-06-10 | 中国石油集团渤海钻探工程有限公司 | Zero-radius down-hole casing drilling device and drilling method thereof |
| CN205805472U (en) * | 2016-03-26 | 2016-12-14 | 库尔班·卡斯木 | A kind of machinery down-hole drilling device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114922581A (en) * | 2022-05-27 | 2022-08-19 | 重庆科技学院 | Underground casing continuous hole forming device and working method thereof |
| CN114922581B (en) * | 2022-05-27 | 2023-08-18 | 重庆科技学院 | Underground casing pipe continuous perforating device and working method thereof |
| CN115405265A (en) * | 2022-07-06 | 2022-11-29 | 重庆科技学院 | Electrically-driven underground casing continuous hole drilling device and working method thereof |
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| PB01 | Publication | ||
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| TA01 | Transfer of patent application right |
Effective date of registration: 20200929 Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: China National Petroleum Corporation Great Wall Drilling Engineering Co.,Ltd. Address before: 124010 Xinglongtai, Liaoning Province, oil street, No. 96, No. Applicant before: China National Petroleum Corporation Great Wall Drilling Engineering Co.,Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190809 |