CN106523023A - Pulse hydraulic fracturing device and method based on continuous rotary valve - Google Patents
Pulse hydraulic fracturing device and method based on continuous rotary valve Download PDFInfo
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- CN106523023A CN106523023A CN201611235577.6A CN201611235577A CN106523023A CN 106523023 A CN106523023 A CN 106523023A CN 201611235577 A CN201611235577 A CN 201611235577A CN 106523023 A CN106523023 A CN 106523023A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 167
- 239000003245 coal Substances 0.000 claims abstract description 46
- 239000011435 rock Substances 0.000 claims abstract description 36
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 210000001367 artery Anatomy 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 210000003462 vein Anatomy 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 238000013459 approach Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 4
- 230000010349 pulsation Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Details Of Valves (AREA)
Abstract
The invention provides a pulse hydraulic fracturing device and method based on a continuous rotary valve. The pulse hydraulic fracturing device based on the continuous rotary valve is composed of a water tank, a water injection pipeline, a water pump, a pressure relief pipeline, the continuous rotary ball valve, a hydraulic motor and the like. According to the pulse hydraulic fracturing method based on the continuous rotary valve, stable pulse water pressure is generated in the water injection pipeline through periodical opening and closing of the continuous rotary ball valve, and a novel technical approach is provided for dynamic hydraulic fracturing of coal rocks. After the continuous rotary ball valve is connected into the water injection pipeline, a valve element of the continuous rotary ball valve is driven by the hydraulic motor to rotate, the valve is opened and closed continuously and stably, the periodical water hammer effect is formed in a water path injected into a coal rock body, and the pulse water pressure is generated; and the continuous rotary ball valve is improved, when the improved continuous rotary ball valve is closed, high-pressure water in the coal rock body can decrease the pressure actively, the vibration amplitude of the pulse water pressure is increased, and the technical effect of hydraulic fracturing is improved.
Description
Technical field
The present invention relates to pulsed hydraulic fracturing device and method, particularly a kind of company suitable for pressure break is carried out to coal and rock
The device and method of continuous rotary valve pulsed hydraulic fracturing, category Coal Mining Technology field.
Background technology
In recent years, hydraulic fracturing technology has obtained extensive attention in colliery.It is main former in coal petrography body because making in the method
Raw crack expands, extends, or forms new hole, crack, promotes rock mass to produce displacement, realizes release in coal seam, anatonosis, from
And can be used for the technical fields such as gas drainage under suction, stress distribution control and coal and rock water filling reduction.
Hydraulic fracturing is generally divided into common hydraulic fracturing and pulsed hydraulic fracturing.Common hydraulic fracturing mainly utilizes high pressure
Fracturing fluid is pressed into target coal rock layer by power, the water injecting pump of big flow, is needed elevated pressures, and be there is crack closure water conservancy diversion energy
Power declines, crack development is unordered, the problems such as pressure break poor controllability.For this purpose, pulsed hydraulic fracturing becomes new probing direction.Pulsation
In hydraulic fracturing process, coal body bears the stress of mechanical periodicity, and periodically expansion closure occurs in fissure-plane under this condition
Motion, it is easier to fatigue rupture occurs, is conducive to the extension and extension of cracks in coal seam, can realize under relatively small pressure
Release on a large scale to coal rock layer is anti-reflection.
One of pulsed hydraulic fracturing key problem in technology is the generation that pulsation is forced, and has two kinds to realize device at present：One is design
The dynamic pressure pump of dynamic pressure water, such as 40/12 type pulsed coal-bed flooding pumps of 2BZ are produced directly；Another is high-pressure pulsating water-hammer device.
It is effective that two kinds of devices demonstrate pulsed hydraulic fracturing.
As pulsed hydraulic fracturing technology is still in initial stage of development, except related theoretical research will be strengthened, develop skill
The science of parameter is outer, explores new technological approaches, and the important content of the technology development.
The content of the invention
Technical problem：The invention aims to overcome weak point of the prior art, there is provided a kind of simple structure, behaviour
Make the good continuous rotary valve pulsed hydraulic fracturing device and method of convenient, controllability.
Technical scheme：The continuous rotary valve pulsed hydraulic fracturing device of the present invention, including water tank, Jing water injecting pipelines one and water
The water pump of case connection, the outlet of water pump are provided with the water injecting pipeline two for leading to coal and rock, and water injecting pipeline two is provided with continuous screw
Valve, continuous rotary valve Jing shaft couplings are connected with hydraulic motor, and the arrival end of hydraulic motor connects what is be connected with water injecting pipeline two
Hydraulic motor inlet pipeline, the port of export of hydraulic motor connect the hydraulic motor water return pipeline communicated with water tank；In the water tank
Waterfront economy water lines one feed water pump, water flows through continuous rotary valve and the injection coal and rock of water injecting pipeline two after water pump supercharging.
Continuous rotary valve includes the valve body being integrated is fastened by valve seat and valve gap, is provided with and is consolidated at valve seat and valve gap fastening
Screw bolt and nut together is scheduled on, the fixing axle for valve element being provided with described valve seat and being connected with valve element is symmetrically set in fixing axle
Valve seat is stretched out on the top for having rolling bearing, fixing axle, and bottom is provided with relief hole, and valve water inlet and outlet are provided with valve gap.
Diameter of the valve outlet of continuous rotary valve with diameter greater than valve water inlet.
Above-mentioned continuous rotary valve pulsed hydraulic fracturing device and method, comprises the steps：
A. water tank, water injecting pipeline one, water pump, the water injecting pipeline led in coal petrography body are set in the tunnel that coal and rock is located
Two, continuous rotary valve is installed on water injecting pipeline two, and hydraulic motor is installed on continuous rotary valve；
When b. working, the water in water tank feeds water pump, and water flows to continuous rotary valve, hydraulic motor profit after water pump supercharging
With the water under high pressure of water injecting pump generation as working media, drive the valve element of continuous rotary valve to make continuous rotation, make continuous rotary valve
Door is periodically opened and is closed, the injection coal and rock of periodicity water under high pressure Jing water injecting pipelines two of outflow, is formed in coal petrography body
Periodicity water hammer effect, so as to pulsating water pressure is produced in coal and rock, realizes dynamic pressure hydraulic fracturing；
C., when continuous rotary valve rotates to closed mode, spilled water hole goes to outlet or water inlet side, sluicing hole position
When valve water inlet end side, the aperture of spilled water hole is closed by valve body, when spilled water hole is located at outlet side, leads with water injecting pipeline two
Logical, two inner high voltage water energy of water injecting pipeline is flowed out by spilled water hole, returns supply tank, and in coal petrography body, hydraulic pressure declines, so as to increase rotation
When rotary valve is opened, the amplification of coal and rock hydraulic pressure, increases the amplitude of pressure.
Beneficial effect：The present invention according to the unexpected open and close of valve in conduit under fluid pressure can make in pipeline rate of flow of fluid and
Momentum changes, and causes the sharp increase of pressure or reduces sharply, and so as to induce the principle of water hammer, provides one kind and realizes pulsed hydraulic fracturing
Technical method, be to the abundant of pulsed hydraulic fracturing technology and develop.Jing test with it was verified that pulsed hydraulic fracturing can be
More preferable technique effect is obtained under the conditions of less pump pressure.It is pulsating water pressure by hydrostatic variable pressure, there is provided new pulsation waterpower
Fracturing technique scheme.The hydrostatic frac system of coal and rock is initially set up, is mainly included hydrostatic pumps and is led in coal and rock drilling
Pipe-line system.On this basis, increase a continuous rotary valve door in the pipe-line system of water pump output, continuous rotary valve door
Valve element continuously can rotate, and water injecting pipeline generating period is opened and closure.The unlatching of valve causes water hammer to imitate with closure nature
Should, dynamic pressure is produced, so as to increase the fracturing effect of coal and rock.To increase the dynamic pressure effect that continuous rotary valve door is produced, to valve element
It is improved.A relief hole is done in valve element, when valve is closed, perforate can be with one lateral line UNICOM of coal and rock, can
Make part water energy backflow recovery tank, cause the decline of hydraulic pressure in coal and rock drilling.When Spool rotating is to opening, water pump pair
The ftercompction of pipeline, makes hydraulic pressure increase in coal petrography body, so as to stable fluctuation pressure is produced in the continuous rotation of valve element.Coal and rock
Pulsed hydraulic fracturing be new tool that control of coalmine gas and ore deposit press control technology, which it is critical only that the hydrodynamic generation of arteries and veins.
The pulsed hydraulic fracturing equipment of high efficient and reliable is explored and developed, is the core content of the technology development.The fracturing system is tied
Structure is simple, and it is convenient to realize, workable, can provide pressure peak higher pulsation water using the method, solve water filling
The equipment such as pump are difficult to the problem for bearing more high dynamic pressure, can be preferably applied to hydraulic fracturing or coal seam water infusion engineering.
Description of the drawings
Fig. 1 is the continuous rotary valve pulsed hydraulic fracturing apparatus structure schematic diagram of the present invention；
Fig. 2 is the continuous rotary valve door schematic diagram of the present invention.
In figure：1- water tanks, 2- water injecting pipelines one, 3- water pumps, 4- water injecting pipelines two, 5- pressure relief pipes, 6- continuous rotary valves,
7 coal and rocks, 8- hydraulic motor water return pipelines, 9- hydraulic pressure horse inlet pipelines, 10- hydraulic motors, 11- shaft couplings, 12- fixing axles,
13- fillers, 14- valve elements, 15- valve bodies, 16- valve water inlets, 17- bolts, 18- nuts, 19- rolling bearings, 20- relief holes,
21- sealing rings, 22- valve outlets.
Specific embodiment
The present invention is further illustrated for embodiment in below in conjunction with the accompanying drawings：
Such as showing for Fig. 1, the continuous rotary valve pulsed hydraulic fracturing device of the present invention, mainly by water tank 1, water injecting pipeline, water
Pump 3, pressure relief pipe 5,6 hydraulic motor 8 of continuous rotary ball valve etc. are constituted.1 Jing water injecting pipelines of water tank 1 connect water pump 3, water pump 3
Outlet be provided with the water injecting pipeline 24 for leading to coal and rock, water injecting pipeline 24 is provided with continuous rotary valve 6,6 Jing of continuous rotary valve
Shaft coupling 11 is connected with hydraulic motor 10, and the hydraulic motor that the arrival end connection of hydraulic motor 10 is connected with water injecting pipeline two enters
Water lines 9, the port of export of hydraulic motor 10 connect the hydraulic motor water return pipeline 8 communicated with water tank 1；Water in the water tank 1
Jing water injecting pipelines 1 feed water pump 3, and water flows through continuous rotary valve 6 and the injection coal and rock of water injecting pipeline 24 after the supercharging of water pump 3
7。
As shown in Fig. 2 described continuous rotary valve 6 includes the valve body 15 being integrated is fastened by valve seat and valve gap, valve seat and
The bolt 17 and nut 18 being secured together is provided with valve gap fastening, be provided with described valve seat valve element 14 and with valve element 14
Connected fixing axle 12, is arranged with rolling bearing 19 in fixing axle 12, valve seat is stretched out on the top of fixing axle 12, and bottom is provided with lets out
Pressure hole 20, during 20 aperture turns water inlet of pressure relief vent, is closed by valve body 15, when turning to outlet, is then connected with water injecting pipeline 24
It is logical, valve water inlet 16 is provided with the valve gap, the valve outlet 22 communicated with valve water inlet 16 in the valve seat, is provided with.Described
Diameter of the valve outlet 22 of continuous rotary valve 6 with diameter greater than valve water inlet 16.
The continuous rotary valve pulsed hydraulic fracturing method of the present invention, comprises the following steps that：
A. water tank 1, water injecting pipeline 1, water pump 3, the note led in coal and rock 7 are set in the tunnel that coal and rock 7 is located
Water lines 24, install continuous rotary valve 6 on water injecting pipeline 24, and hydraulic motor 10 is installed on continuous rotary valve 6；
B. water tank 1 supplies water through 2 feed pump 3 of pipeline, and water flows to continuous rotary valve 6, hydraulic motor after the supercharging of water pump 3
10 adopt the water under high pressure that water injecting pump 3 is produced as working media, and driving the valve element 14 of continuous rotary valve 6 to make continuous rotation makes continuously
Changeover valve 6 is periodically opened and is closed, and produces periodicity water hammer effect, so as to produce arteries and veins in coal and rock 7 in pipeline 4
Flowing pressure, realizes dynamic pressure hydraulic fracturing；
C., when continuous rotary valve 6 rotates to closed mode, spilled water hole 20 goes to 16 side of outlet 22 or water inlet, lets out
When water hole 20 is located at valve 16 side of water inlet end, the aperture of spilled water hole 20 is closed by valve body 15, and spilled water hole 20 is located at outlet 22 1
During side, spilled water hole 20 is turned on water injecting pipeline 24, and two inner high voltage water energy of water injecting pipeline is flowed out by spilled water hole, returns supply tank,
In coal petrography body, hydraulic pressure declines, and so as to increase the amplification of coal and rock hydraulic pressure when rotary valve is opened, increases the amplitude of pressure.
Claims (4)
1. a kind of continuous rotary valve pulsed hydraulic fracturing device, it is characterised in that：It includes water tank（1）, Jing water injecting pipelines one（2）
The water pump being connected with water tank（3）, water pump（3）Outlet be provided with the water injecting pipeline two for leading to coal and rock（4）, water injecting pipeline two（4）
It is provided with continuous rotary valve（6）, continuous rotary valve（6）Jing shaft couplings（11）It is connected with hydraulic motor（10）, hydraulic motor（10）
Arrival end connection with water injecting pipeline two（4）The hydraulic motor inlet pipeline being connected（9）, hydraulic motor（10）The port of export connect
Connect and water tank（1）The hydraulic motor water return pipeline for communicating（8）；The water tank（1）Interior waterfront economy water lines one（2）Feed water pump
（3）, water is through water pump（3）After supercharging, continuous rotary valve is flowed through（6）With water injecting pipeline two（4）Injection coal and rock（7）.
2. a kind of continuous rotary valve pulsed hydraulic fracturing device according to claim 1, it is characterised in that：Described is continuous
Rotary valve（6）Including the valve body being integrated by valve seat and valve gap fastening（15）, it is provided with valve seat and valve gap fastening and is fixed in
Bolt together（17）And nut（18）, in described valve seat, it is provided with valve element（14）And with valve element（14）Connected fixing axle
（12）, fixing axle（12）On be arranged with rolling bearing（19）, fixing axle（12）Top stretch out valve seat, bottom is provided with relief hole
（20）Valve water inlet is provided with the valve gap（16）Outlet（22）.
3. a kind of continuous rotary valve arteries and veins pulsed hydraulic fracturing device according to claim 1 and 2, it is characterised in that：It is described
Continuous rotary valve（6）Valve outlet（22）With diameter greater than valve water inlet（16）Diameter, pressure relief vent（20）Aperture turns are entered
During the mouth of a river, by valve body（15）Closing, when turning to outlet, then with water injecting pipeline two（4）Connection.
4. the method for continuous rotary valve pulsed hydraulic fracturing device according to claim 3, it is characterised in that including following step
Suddenly：
A. in coal and rock（7）Water tank is set in the tunnel at place（1）, water injecting pipeline one（2）, water pump（3）, lead to coal and rock（7）
Interior water injecting pipeline two（4）, in water injecting pipeline two（4）Upper installation continuous rotary valve（6）, and in continuous rotary valve（6）Upper installation
Hydraulic motor（10）；
When b. working, water tank（1）Interior water feeds water pump（3）, water is through water pump（3）Continuous rotary valve is flowed to after supercharging（6）, liquid
Pressure motor（10）Using water pump（3）The water under high pressure of generation drives continuous rotary valve as working media（6）Valve element（14）Work connects
It is continuous to rotate, continuous rotary valve door is periodically opened and is closed, the periodicity water under high pressure Jing water injecting pipelines two of outflow（4）Injection
Coal and rock（7）, in coal and rock（7）Interior formation periodicity water hammer effect, so as in coal and rock（7）Middle generation pulsating water pressure, it is real
Existing dynamic pressure hydraulic fracturing；
C. work as continuous rotary valve（6）When rotating to closed mode, spilled water hole（20）Go to water inlet（16）Or outlet（22）One
Side, spilled water hole（20）Positioned at valve water inlet end（16）During side, spilled water hole（20）Aperture by valve body（15）Closing, spilled water hole（20）
Positioned at outlet（22）During side, with water injecting pipeline two（4）Conducting, water injecting pipeline two（4）Inner high voltage water energy passes through spilled water hole
（20）Flow out, return supply tank（1）, coal and rock（7）Interior hydraulic pressure declines, so as to increase rotary valve（6）Coal and rock during unlatching（7）
The amplification of hydraulic pressure, increases the amplitude of pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235577.6A CN106523023B (en) | 2016-12-28 | 2016-12-28 | Continuous rotary valve pulsed hydraulic fracturing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235577.6A CN106523023B (en) | 2016-12-28 | 2016-12-28 | Continuous rotary valve pulsed hydraulic fracturing device and method |
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| Publication Number | Publication Date |
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| CN106523023A true CN106523023A (en) | 2017-03-22 |
| CN106523023B CN106523023B (en) | 2018-07-27 |
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| CN201611235577.6A Expired - Fee Related CN106523023B (en) | 2016-12-28 | 2016-12-28 | Continuous rotary valve pulsed hydraulic fracturing device and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228109A (en) * | 2017-06-23 | 2017-10-03 | 江苏科技大学 | A kind of ball-valve type flutter generator |
| CN109915100A (en) * | 2019-04-11 | 2019-06-21 | 中国地质科学院地质力学研究所 | Water draw-off and two-tube water pressure supporing system |
| CN111229046A (en) * | 2020-01-20 | 2020-06-05 | 浙江机电职业技术学院 | Self-adaptive backwashing cleaning device and method for ultrafiltration membrane in water purifier |
| CN111622727A (en) * | 2020-05-18 | 2020-09-04 | 中国石油天然气股份有限公司 | Method for identifying effectiveness of temporary plugging diversion fracturing |
| CN112392423A (en) * | 2020-12-23 | 2021-02-23 | 大庆油田有限责任公司 | Pulse well washing device for water injection well |
| CN113123790A (en) * | 2021-04-21 | 2021-07-16 | 太原理工大学 | Method for controlling collapse of cantilever beam top plate by liquid explosion |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228109A (en) * | 2017-06-23 | 2017-10-03 | 江苏科技大学 | A kind of ball-valve type flutter generator |
| CN109915100A (en) * | 2019-04-11 | 2019-06-21 | 中国地质科学院地质力学研究所 | Water draw-off and two-tube water pressure supporing system |
| CN109915100B (en) * | 2019-04-11 | 2019-12-24 | 中国地质科学院地质力学研究所 | Water drainage device and double-pipe hydrofracturing ground stress measurement system |
| CN111229046A (en) * | 2020-01-20 | 2020-06-05 | 浙江机电职业技术学院 | Self-adaptive backwashing cleaning device and method for ultrafiltration membrane in water purifier |
| CN111622727A (en) * | 2020-05-18 | 2020-09-04 | 中国石油天然气股份有限公司 | Method for identifying effectiveness of temporary plugging diversion fracturing |
| CN111622727B (en) * | 2020-05-18 | 2022-08-05 | 中国石油天然气股份有限公司 | Method for identifying effectiveness of temporary plugging diversion fracturing |
| CN112392423A (en) * | 2020-12-23 | 2021-02-23 | 大庆油田有限责任公司 | Pulse well washing device for water injection well |
| CN113123790A (en) * | 2021-04-21 | 2021-07-16 | 太原理工大学 | Method for controlling collapse of cantilever beam top plate by liquid explosion |
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| Publication number | Publication date |
|---|---|
| CN106523023B (en) | 2018-07-27 |
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