CN106703773A - Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device - Google Patents
Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device Download PDFInfo
- Publication number
- CN106703773A CN106703773A CN201510479293.0A CN201510479293A CN106703773A CN 106703773 A CN106703773 A CN 106703773A CN 201510479293 A CN201510479293 A CN 201510479293A CN 106703773 A CN106703773 A CN 106703773A
- Authority
- CN
- China
- Prior art keywords
- proppant
- carbon dioxide
- liquid carbon
- coal
- liquid
- 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
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a liquid carbon dioxide bomb and a propping agent blasting anti-reflection method and a device. The device comprises a liquid storage tube provided with a priming device and liquid carbon dioxide. A releasing tube with propping agent inside is arranged in the front part of the liquid storage tube. A plurality of spray-holes are disposed on the tube wall of the releasing tube. The propping agent is wrapped in a thin strip-shape with plastic film and put into the releasing tube. High-pressure gases produced by vaporized liquid CO2 after liquid CO2 bomb detonates in coal seam form a large number of fractures in drill holes. The high-pressure gas destroys the plastic film wrapping the propping agent during an explosion process. The propping agent with the high-pressure gases enters into coal seam fractures and fractures formed by propping, prolongs existing time of the fractures. The fractures have big presplit radius in coal seam, which can effectively reduce drilling hole amounts in a current extraction and exploitation system in underground coal mines, improve extraction efficiency, reduce pre-extraction time of gas and extraction cost of gas in coal mine, improve a production efficiency of coal, and enhance security of coal production.
Description
Technical field
The present invention relates to increase gas permeability of coal seam technology, specifically a kind of liquid carbon dioxide suitable for low air permeability coal seam
Big gun is with proppant explosion anti-reflection method and device.
Background technology
According to《Preventing and treating coal and gas prominent regulation》With《Gas pumping Tentative Measures up to standard》, for high gas layer and prominent coal
Layer, firstly the need of carrying out gas pumping before exploitation.But the gas permeability that most of high methane of China is projecting coal bed is very low, unfavorable
In gas pumping, need to carry out that coal seam is anti-reflection before drainage from coal seam, to improve the gas permeability in coal seam.Current anti-reflection technology is main
Including hydraulic fracturing, hydraulic flushing in hole, deep hole blasting and anti-reflection technology etc. liquid carbon dioxide explosion.
The content of the invention
Can increase gas permeability of coal seam it is an object of the invention to provide one kind, improve the liquid carbon dioxide big gun of coal bed gas extraction efficiency
With proppant explosion anti-reflection method and device.
Realize the object of the invention technical scheme：
A kind of liquid carbon dioxide big gun is with proppant explosion permeability improvement device including internal equipped with priming device and liquid carbon dioxide
Liquid storage pipe, the rear portion of liquid storage pipe is provided with the connector being connected with priming device, and connector is provided with one end connection priming device, another
One end connects the electric lead of initiator, the front portion of the liquid storage pipe is provided with release pipe, and release pipe with plastic sheeting built with being wrapped up
Proppant, discharge pipe rear portion be connected with the front threads of liquid storage pipe, discharge pipe front portion be provided with loading proppant fill mouth with
Sealing fills the sealing-plug of mouth, and multiple spray-holes are provided with described release tube wall border.
Described proppant is quartz sand or yellow ground.
Using the liquid carbon dioxide big gun of said apparatus with proppant explosion anti-reflection method, comprise the following steps：
A. proppant is rolled into elongate strip form with plastic sheeting, load at mouth in release pipe from is filled, be filled with sealing-plug
Mouth sealing；
B. drilled along coal seam 30~40m of construction, connector is coupled with drilling rod, liquid carbon dioxide big gun is added into support using rig
In the coal bed drilling that agent explosion permeability improvement device is pushed；
C. initiator button is pressed, priming device energization vigorous combustion produces substantial amounts of heat energy, vaporizes liquid carbon dioxide and produce
Gases at high pressure, when high-pressure gas pressure exceedes the intensity of liquid storage pipe front portion rupture disk, the rupture disk rupture of liquid storage pipe front portion, high pressure gas
Body moment enters in release pipe, and the spray-hole from release tube wall is entered in drilling, and a large amount of cracks are formed in drilling, meanwhile,
Gases at high pressure wash the plastic sheeting of parcel proppant open, and proppant sprays with gases at high pressure from the spray-hole on release tube wall,
Into in cracks in coal seam, formed crack, the time that extension crack is present, the gas permeability in this enhancing coal seam, so as to put forward are supported
The extraction rate of coal-bed gas high.
The quantity for loading the proppant in release pipe is 2~4.
Beneficial effect：The present invention uses liquid carbon dioxide blasting technique, has larger presplitting radius in coal seam, can be effective
The drilling hole amount in the existing extraction system of underground coal mine is reduced, extraction efficiency is improved.Liquid is previously implanted by loading in drilling
The blasting cartridge of carbon dioxide, using liquid CO after detonation2The high pressure wave for producing is vaporized, can be anti-reflection with presplitting coal seam, improve coal seam
Permeability, increases gas pumping efficiency.Because coal body is to CO2Adsorptivity far above to the adsorptivity of gas so that after explosion
CO2Can be detained, and displacement goes out the gas of a large amount of coal body absorption, therefore the gas permeability in coal seam is improve, supported by proppant
The crack that explosion is formed can extend the time of crack presence, so as to substantially increase gas pumping effect, shorten the pre- of gas
Find time, and reduce the extraction cost of coal mine gas, and then improve coal production efficiency, enhance coal mine production safety.
Its simple structure, easy to operate, low cost, effect is good, in the art with wide applicability.
Brief description of the drawings
Fig. 1 is liquid carbon dioxide big gun with proppant explosion permeability improvement device structural representation.
Fig. 2 is liquid carbon dioxide big gun with coal seam schematic diagram after proppant explosion permeability improvement device explosion.
In figure：1st, initiator, 2, electric lead, 3, connector, 4, priming device, 5, liquid storage pipe, 6, liquid titanium dioxide
Carbon, 7, release pipe, 8, proppant, 9, fill mouth, 10, sealing-plug.
Specific embodiment
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings：
Liquid carbon dioxide big gun of the invention with proppant explosion permeability improvement device, mainly by initiator 1, connector 3, priming device
4th, liquid storage pipe 5 and release pipe 7 are constituted.The inside of liquid storage pipe 5 is equipped with priming device 4 and liquid carbon dioxide 6, liquid storage pipe 5
Rear portion is provided with the connector 3 being connected with priming device 4, and connector 3 is provided with one end connection priming device 4, other end and connects
The electric lead 2 of quick-fried device 1, the front portion of the liquid storage pipe 5 is provided with release pipe 7, and release pipe 7 is built with the branch wrapped up with plastic sheeting
Support agent 8, described proppant 8 is quartz sand or yellow ground.The rear portion for discharging pipe 7 is connected with the front threads of liquid storage pipe 5, releases
The front portion for putting pipe 7 is provided with the sealing-plug 10 that mouth 9 fills mouth 9 with sealing that fills for loading proppant 8, and described release pipe 7 is managed
Multiple spray-holes are provided with wall border.
Liquid carbon dioxide big gun of the invention is increased using liquid carbon dioxide big gun with proppant explosion anti-reflection method with proppant explosion
Thoroughly, liquid CO after detonation2Vaporize the gases at high pressure for producing and a large amount of cracks are formed in drilling, blasting process mesohigh gas is broken
Plastic sheeting, proppant enters cracks in coal seam with gases at high pressure, supports the crack for being formed, and the time that extension crack is present, carries
High methane extracting result；Comprise the following steps that：
A. proppant 8 is rolled into elongate strip form with plastic sheeting, load at mouth 9 in release pipe 7 from is filled, load release
The quantity of the proppant 8 in pipe 7 is 2~4, and suitable concrete condition determines consumption, and being filled with mouth 9 with sealing-plug 10 afterwards seals；
B. along coal seam construct 30~40m drill, after the completion of take out drilling in all devices；Connector 3 is coupled with drilling rod, profit
In coal bed drilling liquid carbon dioxide big gun pushed with proppant explosion permeability improvement device with rig, according to pre-splitting hole parameter, really
Protect and release pipe is arranged in coal seam section, drilling is carried out into sealing of hole using stemming；
C. priming device 4 is connected with the initiator 1 of outside by electric lead 2, presses the button of initiator 1, and priming device 4 leads to
After electricity, vigorous combustion produces substantial amounts of heat energy, and then liquid carbon dioxide 6 is vaporized generation gases at high pressure, when gases at high pressure pressure
Power exceedes the intensity of the anterior rupture disk of liquid storage pipe 5, and the anterior rupture disk rupture of liquid storage pipe 5, gases at high pressure moment enters release pipe 7
Interior, the spray-hole from the release tube wall of pipe 7 is entered in drilling, and a large amount of cracks are formed in drilling, meanwhile, gases at high pressure impact
The plastic sheeting of proppant 8 is wrapped up, plastic sheeting intensity is relatively low, and high-pressure gas pressure is larger, beats on film, film breaks,
Proppant 8 sprays with high-pressure gas flow from the spray-hole on the release tube wall of pipe 7, washes away into cracks in coal seam, supports institute
The crack of formation, the time that extension crack is present, strengthens the gas permeability in coal seam, so as to improve the extraction rate of coal-bed gas；
D. liquid carbon dioxide big gun is taken out with proppant explosion permeability improvement device, sealing of hole is carried out to drilling and gas pumping is carried out.
Claims (4)
1. a kind of liquid carbon dioxide big gun is equipped with priming device with proppant explosion permeability improvement device, including inside（4）And liquid carbon dioxide（6）Liquid storage pipe（5）, liquid storage pipe（5）Rear portion be provided with and priming device（4）Connected connector（3）, connector（3）It is provided with one end connection priming device（4）, the other end connection initiator（1）Electric lead（2）, it is characterised in that：The liquid storage pipe（5）Front portion be provided with release pipe（7）, release pipe（7）Built with the proppant wrapped up with plastic sheeting（8）, release pipe（7）Rear portion and liquid storage pipe（5）Front threads connection, release pipe（7）Front portion be provided with loading proppant（8）Fill mouth（9）Mouth is filled with sealing（9）Sealing-plug（10）, described release pipe（7）Multiple spray-holes are provided with tube wall border.
2. according to claim 1 a kind of liquid carbon dioxide big gun with proppant explosion permeability improvement device, it is characterised in that：Described proppant（8）It is quartz sand or yellow ground.
3. a kind of liquid carbon dioxide big gun of 1 described device of usage right requirement is with proppant explosion anti-reflection method, it is characterised in that comprise the following steps：
A. with plastic sheeting by proppant（8）Elongate strip form is rolled into, from filling mouth（9）Place loads release pipe（7）It is interior, use sealing-plug（10）It is filled with mouth（9）Sealing；
B. drilled along coal seam 30 ~ 40m of construction, by connector（3）Couple with drilling rod, using in the coal bed drilling that rig pushes liquid carbon dioxide big gun with proppant explosion permeability improvement device；
C. initiator is pressed（1）Button, priming device（4）Energization vigorous combustion produces substantial amounts of heat energy, makes liquid carbon dioxide（6）Vaporization produces gases at high pressure, when high-pressure gas pressure exceedes liquid storage pipe（5）The intensity of anterior rupture disk, liquid storage pipe（5）Anterior rupture disk rupture, gases at high pressure moment enters release and manages（7）It is interior, managed from release（7）Spray-hole on tube wall is entered in drilling, and a large amount of cracks are formed in drilling, meanwhile, gases at high pressure wash parcel proppant open（8）Plastic sheeting, proppant（8）As gases at high pressure are managed from release（7）Sprayed in spray-hole on tube wall, into cracks in coal seam, support formed crack, the time that extension crack is present, strengthen the gas permeability in coal seam, so as to improve the extraction rate of coal-bed gas.
4. liquid carbon dioxide big gun according to claim 3 is with proppant explosion anti-reflection method, it is characterised in that：Load release pipe（7）Interior proppant（8）Quantity be 2 ~ 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510479293.0A CN106703773A (en) | 2015-08-03 | 2015-08-03 | Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510479293.0A CN106703773A (en) | 2015-08-03 | 2015-08-03 | Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106703773A true CN106703773A (en) | 2017-05-24 |
Family
ID=58929893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510479293.0A Pending CN106703773A (en) | 2015-08-03 | 2015-08-03 | Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106703773A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269310A (en) * | 2017-06-15 | 2017-10-20 | 安徽理工大学 | A kind of across coal-rock interface small angle inclination hole heap sand directional blasting anti-reflection method |
| CN107461185A (en) * | 2017-10-09 | 2017-12-12 | 中国矿业大学(北京) | A kind of new fracturing drainage from coal seam coal seam device of air |
| CN107676092A (en) * | 2017-10-10 | 2018-02-09 | 山西煤炭运销集团长治有限公司 | A kind of liquid carbon dioxide phase transformation explosion rapid hole sealing device and method for sealing |
| CN108509694A (en) * | 2018-03-13 | 2018-09-07 | 西安石油大学 | A kind of proppant laying form prediction method based on BP neural network |
| CN110306967A (en) * | 2019-08-20 | 2019-10-08 | 河南理工大学 | A kind of coal seam hydraulic fracture couples anti-reflection method and device with hydraulic pressure demolition |
| CN110346532A (en) * | 2019-06-04 | 2019-10-18 | 中国地质大学（武汉） | A kind of simulation laboratory test system using carbon dioxide blast cracking hot dry rock |
| CN110541696A (en) * | 2019-07-15 | 2019-12-06 | 河南理工大学 | carbon dioxide blasting-hydraulic fracturing reconstruction yield increasing method for oil and gas well |
| CN110579792A (en) * | 2019-10-25 | 2019-12-17 | 河北裕隆机械有限责任公司 | Carbon dioxide phase change controllable seismic source and construction method thereof |
| CN111396028A (en) * | 2020-03-30 | 2020-07-10 | 西安科技大学 | Based on liquid CO2Equivalent quantitative evaluation method for reaching standards of fracturing permeability-increasing and phase-change drive gas extraction |
| CN113048845A (en) * | 2021-02-05 | 2021-06-29 | 中国化工程重型机械化有限公司 | Liquid CO2Phase-change hydraulic pressure blasting cartridge |
| CN113047900A (en) * | 2021-04-09 | 2021-06-29 | 中国矿业大学 | Pressure-relief and permeability-increasing device for coal burning body in drill hole and using method of pressure-relief and permeability-increasing device |
| CN113513946A (en) * | 2021-04-27 | 2021-10-19 | 河南理工大学 | CO (carbon monoxide)2Built-in circuit structure of fracturing device |
| CN114199080A (en) * | 2021-11-30 | 2022-03-18 | 国能包头能源有限责任公司 | Carbon dioxide blasting device for blasting massive rock mass |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510979A (en) * | 2013-10-30 | 2014-01-15 | 河南理工大学 | Dry ice explosion and air-permeability-enhancing device and method for drawing out gas by using same |
| CN103806934A (en) * | 2014-02-28 | 2014-05-21 | 山东科技大学 | High-stress low-porosity coal bed presplitting permeability-increase methane drainage system and method |
| CN203655295U (en) * | 2013-10-17 | 2014-06-18 | 湖南汉寿中煤科技有限公司 | Large-dose CO2 air cannon device |
| US20150013977A1 (en) * | 2010-09-21 | 2015-01-15 | Palmer Labs, Llc | Method of using carbon dioxide in recovery of formation deposits |
| CN104500019A (en) * | 2014-11-18 | 2015-04-08 | 辽宁工程技术大学 | Reinforced anti-reflection method for promoting gas extraction |
| CN104612644A (en) * | 2014-11-18 | 2015-05-13 | 山西潞安矿业(集团)有限责任公司 | Gas phase fracturing and fast gas extraction method for low permeability coal bed |
| CN204327056U (en) * | 2014-12-11 | 2015-05-13 | 河南省煤炭科学研究院有限公司 | Carbon dioxide ultrahigh speed phase transformation exploitation device |
| CN104632174A (en) * | 2014-12-29 | 2015-05-20 | 西安科技大学 | Coal seam liquid carbon dioxide fracturing device and method |
-
2015
- 2015-08-03 CN CN201510479293.0A patent/CN106703773A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150013977A1 (en) * | 2010-09-21 | 2015-01-15 | Palmer Labs, Llc | Method of using carbon dioxide in recovery of formation deposits |
| CN203655295U (en) * | 2013-10-17 | 2014-06-18 | 湖南汉寿中煤科技有限公司 | Large-dose CO2 air cannon device |
| CN103510979A (en) * | 2013-10-30 | 2014-01-15 | 河南理工大学 | Dry ice explosion and air-permeability-enhancing device and method for drawing out gas by using same |
| CN103806934A (en) * | 2014-02-28 | 2014-05-21 | 山东科技大学 | High-stress low-porosity coal bed presplitting permeability-increase methane drainage system and method |
| CN104500019A (en) * | 2014-11-18 | 2015-04-08 | 辽宁工程技术大学 | Reinforced anti-reflection method for promoting gas extraction |
| CN104612644A (en) * | 2014-11-18 | 2015-05-13 | 山西潞安矿业(集团)有限责任公司 | Gas phase fracturing and fast gas extraction method for low permeability coal bed |
| CN204327056U (en) * | 2014-12-11 | 2015-05-13 | 河南省煤炭科学研究院有限公司 | Carbon dioxide ultrahigh speed phase transformation exploitation device |
| CN104632174A (en) * | 2014-12-29 | 2015-05-20 | 西安科技大学 | Coal seam liquid carbon dioxide fracturing device and method |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269310A (en) * | 2017-06-15 | 2017-10-20 | 安徽理工大学 | A kind of across coal-rock interface small angle inclination hole heap sand directional blasting anti-reflection method |
| CN107461185A (en) * | 2017-10-09 | 2017-12-12 | 中国矿业大学(北京) | A kind of new fracturing drainage from coal seam coal seam device of air |
| CN107676092A (en) * | 2017-10-10 | 2018-02-09 | 山西煤炭运销集团长治有限公司 | A kind of liquid carbon dioxide phase transformation explosion rapid hole sealing device and method for sealing |
| CN108509694B (en) * | 2018-03-13 | 2022-02-18 | 西安石油大学 | Proppant paving form prediction method based on BP neural network |
| CN108509694A (en) * | 2018-03-13 | 2018-09-07 | 西安石油大学 | A kind of proppant laying form prediction method based on BP neural network |
| CN110346532A (en) * | 2019-06-04 | 2019-10-18 | 中国地质大学（武汉） | A kind of simulation laboratory test system using carbon dioxide blast cracking hot dry rock |
| CN110541696A (en) * | 2019-07-15 | 2019-12-06 | 河南理工大学 | carbon dioxide blasting-hydraulic fracturing reconstruction yield increasing method for oil and gas well |
| CN110306967A (en) * | 2019-08-20 | 2019-10-08 | 河南理工大学 | A kind of coal seam hydraulic fracture couples anti-reflection method and device with hydraulic pressure demolition |
| CN110579792A (en) * | 2019-10-25 | 2019-12-17 | 河北裕隆机械有限责任公司 | Carbon dioxide phase change controllable seismic source and construction method thereof |
| CN111396028A (en) * | 2020-03-30 | 2020-07-10 | 西安科技大学 | Based on liquid CO2Equivalent quantitative evaluation method for reaching standards of fracturing permeability-increasing and phase-change drive gas extraction |
| CN111396028B (en) * | 2020-03-30 | 2023-02-28 | 西安科技大学 | Gas extraction standard-reaching equivalent quantitative evaluation method based on liquid CO2 fracturing permeability improvement and phase change driving |
| CN113048845A (en) * | 2021-02-05 | 2021-06-29 | 中国化工程重型机械化有限公司 | Liquid CO2Phase-change hydraulic pressure blasting cartridge |
| CN113047900A (en) * | 2021-04-09 | 2021-06-29 | 中国矿业大学 | Pressure-relief and permeability-increasing device for coal burning body in drill hole and using method of pressure-relief and permeability-increasing device |
| CN113047900B (en) * | 2021-04-09 | 2022-02-15 | 中国矿业大学 | Pressure-relief and permeability-increasing device for coal burning body in drill hole and using method of pressure-relief and permeability-increasing device |
| CN113513946A (en) * | 2021-04-27 | 2021-10-19 | 河南理工大学 | CO (carbon monoxide)2Built-in circuit structure of fracturing device |
| CN114199080A (en) * | 2021-11-30 | 2022-03-18 | 国能包头能源有限责任公司 | Carbon dioxide blasting device for blasting massive rock mass |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106703773A (en) | Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device | |
| CN101644156B (en) | Method for weakening coal-rock mass by hydraulic blasting and fracturing | |
| WO2022252591A1 (en) | Cracking permeability increasing method combining hydraulic fracturing and methane in-situ combustion explosion | |
| RU2731428C1 (en) | Method of gas production by alternate use of multi-stage cracking of coal massif during combustion with formation of shock wave and heat-carrier injection | |
| CN105625946B (en) | Coal bed gas horizontal well supercritical CO2Jet stream makes chamber and multistage synchronizes explosion fracturing method | |
| CN108678747B (en) | A kind of method and apparatus of pulsed water fracturing control Top coal caving characteristic | |
| CN108397182A (en) | Electric pulse cooperates with the device and method in the anti-reflection coal seam of frozen-thawed | |
| CN108361061B (en) | Low permeability coal seam electric detonation and microwave-assisted liquid nitrogen freeze thawing anti-reflection device and method | |
| CN106930744A (en) | A kind of millisecond multistage directional blasting dry ice fracturing method and blasting cartridge | |
| CN103352684B (en) | Chemical Physics compound explosion fracturing equipment and manufacture method thereof | |
| CN101440704B (en) | Ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method and specific high-energy gas generator | |
| CN103114871A (en) | Extraction device and method utilizing microwave coal heating layer | |
| CN104500019A (en) | Reinforced anti-reflection method for promoting gas extraction | |
| CN204941505U (en) | Liquid carbon dioxide big gun is with proppant explosion permeability improvement device | |
| CN109931060A (en) | A kind of gas-liquid combination orientation fracturing device and method | |
| CN208168927U (en) | Hypotonic coal seam electric detonation shake and microwave-assisted frozen-thawed permeability improvement device | |
| CN103953339B (en) | A kind of lump coal exploitation coal-winning machine and seam mining method | |
| CN103510979A (en) | Dry ice explosion and air-permeability-enhancing device and method for drawing out gas by using same | |
| CN108194138B (en) | A kind of structure and method for realizing the high-ground stress release of deep ground based on phase transformation guiding presplitting | |
| CN106121644B (en) | The water-filling pressure-bearing unloading pressure by blasting of cellular structure and supporting reinforcement are crosslinked based on drilling in coal and rock plane | |
| CN101581232B (en) | Method for pre-pumping coal body gas by concussion fracture of high-pressure gas | |
| CN112943191A (en) | Method for increasing permeability and displacing coal seam gas by filling dry ice in drill hole | |
| CN107288606A (en) | A kind of method of artificial construction hot dry rock heat reservori | |
| CN208330329U (en) | A kind of oil/gas well combustion type ultra-positive pressure seam auxiliary device | |
| CN206801542U (en) | A kind of blasting cartridge for millisecond multistage directional blasting dry ice fracturing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| 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: 20170524 |