CN212249918U - System for utilize resonance shock wave to reform transform coal bed gas reservoir - Google Patents
System for utilize resonance shock wave to reform transform coal bed gas reservoir Download PDFInfo
- Publication number
- CN212249918U CN212249918U CN202020962080.XU CN202020962080U CN212249918U CN 212249918 U CN212249918 U CN 212249918U CN 202020962080 U CN202020962080 U CN 202020962080U CN 212249918 U CN212249918 U CN 212249918U
- Authority
- CN
- China
- Prior art keywords
- reservoir
- coal
- shock wave
- bed gas
- coal bed
- 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.)
- Active
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a system for utilize resonance shock wave to reform transform coal bed gas reservoir, including ground control system, energy controller and reservoir transformation room, wherein, be provided with the system core part in the inner chamber of reservoir transformation room, the system core part is connected with ground control system through energy controller for produce with the shock wave of the frequency unanimity of coal bed gas reservoir; the utility model discloses utilize simple and easy system relatively, can improve coal bed gas exploitation efficiency, have better popularization meaning in coal bed gas exploitation field.
Description
Technical Field
The utility model relates to a coal bed gas reservoir reforms transform technical field, in particular to utilize system of resonance shock wave transformation coal bed gas reservoir.
Background
The coal bed gas refers to the methane (CH) which is endowed to exist in the coal series4) The hydrocarbon gas which is used as a main component, mainly adsorbed on the surface of coal matrix particles, partially dissociated in coal pores or dissolved in coal bed water is an associated mineral resource of coal, and belongs to the category of unconventional natural gas; on the other hand, coal bed gas is also called coal mine gas, and if effective drainage and dredging are not performed before coal mining, unsafe factors can be brought to coal mining, and the safe production of coal mines is severely restricted. Therefore, from the coal bed gas mining perspective and the coal mine gas control perspective, the coal bed gas needs to be extracted on the ground in the early stage of coal mine development. Although the exploration and development work of coal bed gas resources is carried out on a large scale in China at present, the efficient utilization and development of local coal bed gas are limited due to low rock permeability aiming at a coal bed gas reservoir with low local gas content. Therefore, permeability-increasing transformation of coal rocks is often needed to improve the gas production rate and gas production efficiency of coal bed gas.
At present, relatively mature coalbed methane reservoir permeability-increasing means mainly comprise hydraulic fracturing and shock wave modification, and although the two means have obvious advantages, certain technical disadvantages exist. Although hydraulic fracturing can realize wider reservoir transformation, because the anisotropy of a coal reservoir is obvious, unidirectional fractures along the bedding of coal rock are often formed, and the transformation scale is limited; meanwhile, the transformation degree of hydraulic fracturing is often higher, which can cause serious damage to a coal bed gas reservoir and bring potential rock burst risk to coal mining. In the case of the shock wave modification means, although the coal rock reservoir is not seriously damaged, the modification capability is weak, and the modification range of the reservoir needs to be improved in combination with other ways. Therefore, a reservoir transformation means which can effectively improve the permeability of the coal bed gas reservoir and can not obviously damage the coal measure stratum is needed.
The natural frequency resonance means is one of reservoir transformation means which are gradually raised in China in recent years, but the natural frequency resonance means is mainly applied to the field of shale gas and is not widely popularized in the field of coal bed gas. If the natural frequency resonance means and the shock wave permeation enhancing means are combined, a new technology which can enhance the permeation of the coal bed gas reservoir and protect the coal bed can be formed.
Disclosure of Invention
An object of the utility model is to provide an utilize system of resonance shock wave transformation coal bed gas reservoir, the transformation method who has solved current coal gas reservoir has the defect that the risk is big, inefficiency.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a pair of utilize system of resonance shock wave transformation coal bed gas reservoir, reform transform the room including ground control system, energy controller and reservoir, wherein, be provided with the system core part in the inner chamber of reservoir transformation room, the system core part passes through the energy controller and is connected with ground control system for produce with the shock wave of the frequency unanimity of coal bed gas reservoir.
Preferably, the system core part comprises an explosion cavity, an explosion wire is arranged in the explosion cavity, and the explosion wire is connected with the energy controller.
Preferably, the system core further comprises a top support and a bottom support, the explosion chamber being disposed between the top support and the bottom support.
Preferably, shock wave reinforcement devices for amplifying resonant shock waves are symmetrically arranged on two sides of the explosion cavity.
Preferably, a stress induction device is further arranged in the inner cavity of the reservoir reconstruction chamber; and the stress induction equipment is connected with an oscilloscope arranged outside the reservoir transformation chamber through a data line.
Preferably, the reservoir transformation chamber is sleeved with a protective cushion layer.
Preferably, a coal rock cylindrical sample is placed in the reservoir modification chamber, and the system core part is placed in a cavity of the coal rock cylindrical sample; and a round hole is formed in the end face of the coal rock cylindrical sample along the axial direction of the coal rock cylindrical sample, and the cylindrical sample is assembled in the round hole.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a system for utilize resonance shock wave to reform transform coal bed gas reservoir utilizes energy controller control system core part to produce the shock wave unanimous with the frequency of coal bed gas reservoir, forms a system that joint resonance frequency means and shock wave means reform transform the coal petrography reservoir jointly, this system both can for the coal bed gas reservoir increase the infiltration, also can protect the coal seam simultaneously, can synthesize the gas production volume and the gas production rate that improve coal bed gas, reduce coal system gas, have positive meaning to alleviating global energy pressure and solving coal mine gas safety problem;
meanwhile, control factors and influence rules of the resonance shock wave modified coal bed gas can be further analyzed; the gas production rate and the gas production rate of the coal bed gas can be comprehensively improved, the coal-based gas is reduced, and the method has positive significance for relieving the global energy pressure and solving the safety problem of the coal mine gas. The utility model discloses utilize simple and easy system relatively, can improve coal bed gas exploitation efficiency, have better popularization meaning in coal bed gas exploitation field.
Drawings
Fig. 1 is a schematic flow chart of the present invention.
Fig. 2 is a schematic diagram of the system of the present invention.
Fig. 3 is a schematic sectional top view of the system a-a' of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In order to improve the transformation effect of coal bed gas reservoir, promote the exploitation amount and the exploitation rate of coal bed gas simultaneously, the utility model discloses mainly be gathering and preparing coal bed gas reservoirTesting the natural frequency of the cylindrical (coal rock) sample on the basis of the cylindrical sample and the columnar sample, observing the crack distribution and communication condition of the coal rock before modification by utilizing a CT scanning technology, and acquiring the porosity phi of the coal rock before modification by utilizing a nondestructive testing technology0And permeability k0. And secondly, assembling a system for transforming the coal bed gas reservoir by using the resonance shock wave, adjusting the resonance frequency of the system to be consistent with the natural frequency f of the coal rock reservoir, placing the coal rock cylindrical sample and the columnar sample into the system, and successively placing the system into the upper equipment for packaging. And thirdly, starting a ground control system, detonating the explosive filaments in the explosion cavity through the high-strength control lead to generate high-decibel shock waves with the same frequency as the coal rock, and pushing the high-strength same-frequency shock waves into the coal rock sample through the shock wave enhancement equipment. And finally, repeatedly carrying out reservoir transformation experiments under different experimental conditions, respectively recording and summarizing CT (computed tomography) images, porosity, permeability and other sample data before and after coal rock reservoir transformation, analyzing control factors and influence rules of the effect of transforming the coal bed gas reservoir by using the resonance shock waves, and recovering system equipment for next use.
As shown in fig. 2, the utility model provides a pair of utilize system of resonance shock wave transformation coal bed gas reservoir, including ground control system 1, high strength control wire 2 and protection bed course 4, wherein, protection bed course 4 is shell structure, shell structure's inside is reservoir transformation room 3.
The modification chamber 3 is internally provided with a function/energy storage device 5, an energy controller 6 and a system core part, wherein the ground control system 1 extends into the reservoir modification chamber 3 through a high-strength control wire 2 and is connected with the energy supply/energy storage device 5 for supplying power to the energy supply/energy storage device 5.
The energy supply/storage device 5 is connected with the core part of the system through an energy controller 6; the energy controller 6 is used for outputting an electric signal with set frequency and intensity to the core part of the system, so that the core part of the system generates shock waves consistent with the frequency of the coalbed methane reservoir.
The core part of the system comprises a top support 7 and a bottom support 8, wherein a glass-shaped explosion cavity 9 is arranged between the top support 7 and the bottom support 8.
An explosion wire 10 is arranged in the explosion cavity 9; the explosive wire 10 is connected with the energy controller 6.
Shock wave enhancement devices 11 (similar to audio enhancement devices such as a sound device) are symmetrically arranged on two sides of the explosion cavity 9 and used for amplifying resonance shock waves.
The outer fringe cover of system core part is equipped with coal petrography tube-shape sample 12, install column sample 13 on the coal petrography tube-shape sample 12 for reform transform and test analysis to the coal bed gas reservoir.
A stress induction device 14 is further arranged in the inner cavity of the reservoir reforming chamber 3 and used for collecting stress data in the reservoir reforming process; the stress-sensing device 14 is connected to an oscilloscope 16 outside the reservoir modification chamber 3 via a data line 15.
The high-strength control wire 2 can bear the gravity and swing in the process of hoisting the system and can bear vibration and abrasion in the process of reservoir transformation.
The dimensions of the outer edge of the reservoir reforming chamber 3 are 60cm (length) x 60cm (width) x 80cm (height), and the reservoir reforming chamber can bear the impact action of resonance waves without significant deformation in the reservoir reforming process.
The thickness of the protective cushion layer 4 is preferably 2cm, and the coal rock sample and the reservoir transformation equipment can be prevented from being obviously moved and damaged in the experimental process.
The size of the outer edges of the energy supply/storage device 5, the energy controller 6 and the core part is 10cm, and the longitudinal total height is suitable for being clamped and fixed at the inner edge of the reservoir reconstruction chamber 3.
The chamber 9 and wire 10 should be pre-tuned to repeat detonation during use of the system and to withstand the impact forces of the detonation.
The coal rock cylindrical sample 12 has an outer diameter of 40cm, an inner diameter of 10cm and a height of 40cm, and the top surface and the bottom surface of the sample are nearly parallel to the coal rock bedding.
The coal rock columnar sample 13 is drilled along the outer edge of the cylindrical sample 12, and the rest part of coal rock is not damaged as far as possible in the drilling process; the size of the coal rock columnar sample 13 is preferably 2.5cm in diameter and 5.0-7.5cm in height.
The utility model discloses an utilize resonance shock wave to reform transform coal bed gas reservoir system's operating procedure does:
step 1, collecting and preparing a coal bed gas reservoir (coal rock) cylindrical sample 12, testing the natural frequency of the coal rock cylindrical sample 12, and observing the crack distribution and communication condition of the coal rock before modification by utilizing a CT scanning technology.
Collecting a coalbed methane reservoir sample, wherein the sample size is at least a cube of 50cm multiplied by 50cm, and a certain section of the sample is nearly parallel to the coal petrography bedding. Preparing a cylindrical sample 12 with the diameter of 40cm and the height of 40cm by taking the bedding surface as a plane, and concentrically taking a hole with the diameter of 10cm and the height of 40cm in the cylindrical sample 12 to place shock wave generating equipment; the edges of the cylindrical sample 12 should be marked for CT scan positioning. Acquiring parameters such as natural frequency f of a coal bed gas reservoir by using a resonance frequency tester based on the prepared coal rock cylindrical sample 12; meanwhile, the cylindrical sample 12 is placed into a CT scanning device to observe the crack distribution and communication condition in the cylindrical sample 12 before reservoir transformation.
And preparing coal rock columnar samples 13 along the edges of the coal rock cylindrical samples 12, wherein the size of the columnar samples 13 is preferably 2.5cm in diameter and 5.0-7.5cm in length, the distance between the central axis and the edges of the cylindrical samples 12 is preferably 2-5cm, and a plurality of columnar samples 13 can be drilled along the edges of the cylindrical samples 12 as required. Sequentially utilizing a rock porosity analyzer, a rock permeability tester and the like to nondestructively test the porosity phi of the drilled coal rock columnar sample 130And permeability k0. And after the data recording is finished, putting the coal rock columnar sample 13 into the coal rock cylindrical sample 12 according to the original sequence for the transformation of the resonance shock wave.
And 3, assembling a system for reforming the coal bed gas reservoir by using the resonance shock wave, and debugging the resonance frequency of the reservoir reforming system to be consistent with the natural frequency f of the coal rock reservoir.
After the reservoir transformation system is assembled, the coal rock sample is not placedNext, the stress induction device 14 and the oscilloscope 16 are started, the ground control system 1 is started, the power supply strength and the power supply frequency are continuously debugged until the amplitude and the frequency of the resonance shock wave generated by the explosion cavity 9 are amplified and displayed on the oscilloscope 16 are consistent with the design values, and the power supply strength U and the power supply frequency f at the moment are recordedU. And (3) gradually closing the ground control system 1, the stress induction equipment 14 and the oscilloscope 16, and using the devices when the reservoir is transformed.
And 4, placing the coal rock cylindrical sample 12 and the columnar sample 13 into a system for reforming the coal bed gas reservoir by using resonance shock waves, and successively placing and packaging upper equipment.
Putting the coal rock cylindrical samples 12 with the cylindrical samples 13 on a bottom layer protective cushion layer 4 in a resonance shock wave modified coal bed gas reservoir system, then hoisting a system core part connected with a high-strength control lead 2, an energy controller 6 and an energy supply/storage device 5 by using a lift pump, and reliably connecting the upper part of the system core part with a ground control system 1; and finally, starting the stress sensing equipment 14 and the oscilloscope 16 to observe the stress state in the reservoir transformation chamber 3 at any time.
And 5, starting the ground control system 1, detonating the explosive wire 10 in the explosion cavity 9 through the high-strength control lead 2, generating high-decibel shock waves with the same frequency as the coal rock, and pushing the same-frequency shock waves into the coal rock sample through the shock wave enhancement equipment 11.
Starting the ground control system 1, and adjusting the parameters of the control system to the power supply intensity U and the power supply frequency f in the step 3UAnd simultaneously starting a coal bed gas reservoir transformation experiment. The resonance shock wave which is generated by the detonation wire 10 in the detonation cavity 9 and has the same frequency with the coal bed gas reservoir is pushed and amplified into the coal rock sample after the amplitude is increased by the shock wave enhancement device 11. In the experimental process, the stress state in the reservoir transformation chamber 3 can be observed at any time through the oscilloscope 16; if the number of the oscillograph 16 is obviously increased or decreased or the shock wave frequency f' displayed on the oscillograph 16 and the natural frequency f of the coal rock reservoir are gradually deviated, the ground control system 1 is immediately stopped, and the reasons for generating the abnormity are checked item by item. After the abnormal reasons are completely solved, the ground control system 1 and the resonance shock wave reservoir transformation experiment can be restarted.
And 6, after a period of time, terminating the reservoir transformation experiment by using the ground control system 1, recording relevant experiment parameters, taking out the coal rock cylindrical sample 12 and the cylindrical sample 13 for CT scanning, and testing the relevant parameters such as porosity and permeability of the reservoir after transformation.
After the action of the resonance shock wave reaches the preset time T, the ground control system 1 is utilized to terminate the reservoir transformation experiment, and relevant experiment parameters of the reservoir transformation are recorded, wherein the relevant experiment parameters comprise the action time T, the power supply strength U and the power supply frequency fU. After the system completely stops vibrating, taking out the coal rock cylindrical sample 12 to carry out CT scanning test, and observing the crack distribution and communication condition of the coal rock sample after the resonance shock wave reservoir is modified; in addition, taking out the columnar sample 13, and respectively and nondestructively testing the porosity phi of the columnar sample 13 after reservoir transformation by using a rock porosity analyzer and a permeability testerTAnd permeability kTAnd recording.
And 7, adjusting the time, strength, frequency and the like of the reservoir reforming experiment, repeating the steps 1 to 6, summarizing sample data before and after reforming, and analyzing control factors and influence rules of the effect of reforming the coal bed methane reservoir by the resonance shock wave.
Changing the experimental time T, the intensity U and the frequency f of the coal bed gas reservoir transformationUAnd (3) the parameters are equal, the operation parameters of the ground control system 1 are adjusted according to the parameters, the steps 1 to 6 are repeated, the crack development condition, the crack communication condition, the porosity phi, the permeability k and the like before and after the resonance shock wave modification of the coal bed gas reservoir under different experimental conditions are recorded in sequence, and the recording table can refer to the table 1.
TABLE 1 reforming coal-bed gas reservoir logging chart by resonance shock wave
According to the summary parameters and data in the table 1, the control factors and the influence rules of the resonance shock wave modification of the coal bed gas reservoir can be further analyzed.
And 8, immediately stopping the system after all the experiments for reforming the coal bed gas reservoir by using the resonance shock waves are finished, and recovering all parts of the coal bed gas reservoir reforming system for the next use.
After the experiment of the resonance shock wave modified coal bed gas reservoir is completed or the experiment time reaches a preset time, the ground control system 1 is used for stopping reservoir modification operation, the stress induction equipment 14 and the oscilloscope 16 are sequentially stopped, the energy supply/storage equipment 5, the energy controller 6 and the system core part are lifted by the high-strength control lead 2, the inner cavity of the reservoir modification chamber 3 is cleaned and placed at a ventilation position for airing, residual samples of the coal-rock cylindrical sample 12 and the columnar sample 13 are recovered, and the residual equipment such as the stress induction equipment 14, the data line 15 and the oscilloscope 16 are recovered for next use.
The utility model can provide a system which can jointly transform the coal rock reservoir by means of the resonance frequency and the shock wave, so as to improve the coal rock permeability and the coal bed gas reservoir transformation efficiency; the effect of reforming the coal bed gas reservoir by means of the resonance shock wave can be verified in an experimental mode, and the control factors and the influence rule of reforming the coal bed gas by the resonance shock wave can be further analyzed; the gas production rate and the gas production rate of the coal bed gas can be comprehensively improved, the coal-based gas is reduced, and the method has positive significance for relieving the global energy pressure and solving the safety problem of the coal mine gas. The utility model discloses utilize simple and easy system relatively, can improve coal bed gas exploitation efficiency, have better popularization meaning in coal bed gas exploitation field.
The above description, which is only the specific embodiment of the present invention, can not limit the scope of the utility model, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present invention.
Claims (7)
1. The system for reforming the coal bed gas reservoir by using the resonance shock wave is characterized by comprising a ground control system (1), an energy controller (6) and a reservoir reforming chamber (3), wherein a system core part is arranged in an inner cavity of the reservoir reforming chamber (3), and the system core part is connected with the ground control system (1) through the energy controller (6) and is used for generating the shock wave consistent with the frequency of the coal bed gas reservoir.
2. A system for modifying a coalbed methane reservoir by using a resonant shockwave as claimed in claim 1, wherein the core part of the system comprises an explosion chamber (9), an explosion wire (10) is arranged in the explosion chamber (9), and the explosion wire (10) is connected with the energy controller (6).
3. A system for modifying a coalbed methane reservoir with a resonant shockwave according to claim 2, characterized in that the core of the system further comprises a top support (7) and a bottom support (8), and the detonation chamber (9) is disposed between the top support (7) and the bottom support (8).
4. A system for modifying a coalbed methane reservoir by using a resonant shock wave as defined in claim 2, wherein the two sides of the explosion chamber (9) are symmetrically provided with shock wave enhancement devices (11) for amplifying the resonant shock wave.
5. A system for reforming a coalbed methane reservoir with resonance shock waves according to claim 1, characterized in that a stress induction device (14) is further arranged in the inner cavity of the reservoir reforming chamber (3); the stress induction equipment (14) is connected with an oscilloscope (16) arranged outside the reservoir transformation chamber (3) through a data line (15).
6. A system for reforming a coalbed methane reservoir by using resonance shock waves as defined in claim 1, wherein a protective cushion (4) is sleeved on the reservoir reforming chamber (3).
7. A system for reforming a coalbed methane reservoir with resonance shock waves as defined in claim 1, wherein a coal-rock cylindrical sample (12) is placed in the reservoir reforming chamber (3), and the system core part is placed in a cavity of the coal-rock cylindrical sample (12); and a round hole is formed in the end face of the coal rock cylindrical sample (12) along the axial direction of the sample, and a cylindrical sample (13) is assembled in the round hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020962080.XU CN212249918U (en) | 2020-05-29 | 2020-05-29 | System for utilize resonance shock wave to reform transform coal bed gas reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020962080.XU CN212249918U (en) | 2020-05-29 | 2020-05-29 | System for utilize resonance shock wave to reform transform coal bed gas reservoir |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212249918U true CN212249918U (en) | 2020-12-29 |
Family
ID=73978968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020962080.XU Active CN212249918U (en) | 2020-05-29 | 2020-05-29 | System for utilize resonance shock wave to reform transform coal bed gas reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212249918U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520094A (en) * | 2020-05-29 | 2020-08-11 | 中国华能集团有限公司 | System and method for transforming coal bed gas reservoir by using resonance shock waves |
-
2020
- 2020-05-29 CN CN202020962080.XU patent/CN212249918U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520094A (en) * | 2020-05-29 | 2020-08-11 | 中国华能集团有限公司 | System and method for transforming coal bed gas reservoir by using resonance shock waves |
| WO2021239149A1 (en) * | 2020-05-29 | 2021-12-02 | 中国华能集团清洁能源技术研究院有限公司 | System and method using resonance shockwaves to transform coalbed methane reservoir |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111520094A (en) | System and method for transforming coal bed gas reservoir by using resonance shock waves | |
| Song et al. | Fracturing with carbon dioxide: from microscopic mechanism to reservoir application | |
| CN104061014B (en) | A kind of coal seam anti-reflection experimental device based on high electric field pulse | |
| CN108868740B (en) | Cave pressure relief mining simulation test method for tectonic coal in-situ coal bed gas horizontal well | |
| Huang et al. | Hydraulic fracturing after water pressure control blasting for increased fracturing | |
| Xianjie et al. | Anisotropy of crack initiation strength and damage strength of coal reservoirs | |
| CN102373919B (en) | Experimental apparatus for evaluating coalbed methane cave well completion | |
| CN110306964B (en) | Hydraulic fracturing coal seam crack visualization and permeability increasing effect evaluation method | |
| CN201794583U (en) | Well completion evaluation experiment device for coal bed methane cave | |
| CN107941595A (en) | A kind of method that Simulations on Dynamic Damage in Brittle Rocks degree is measured under the conditions of confined pressure | |
| CN105203639B (en) | A method of detecting rock brittleness using acoustic-emission | |
| CN212249918U (en) | System for utilize resonance shock wave to reform transform coal bed gas reservoir | |
| Kong et al. | Multifractal characteristics and acoustic emission of coal with joints under uniaxial loading | |
| CN105823854A (en) | Gas-solid coupling test device and method for deep coal gas borehole drainage effect | |
| CN110857906A (en) | Rock hydraulic fracture dynamic monitoring system and determination method thereof | |
| CN107560972A (en) | Coal adsorption-desorption Experiment of Methane device and method under ul-trasonic irradiation | |
| CN113216921A (en) | Shock wave energy optimization method for electric pulse pretreatment before fracturing of tight reservoir | |
| CN112943210A (en) | Electric pulse and ultrasonic wave cooperated coalbed methane enhanced mining method | |
| CN110259442B (en) | Coal measure stratum hydraulic fracturing fracture horizon identification method | |
| CN112963125B (en) | Hydraulic punching hole-making and CO2 blasting fracturing displacement cooperative enhanced coal seam gas extraction method | |
| CN107965316A (en) | A kind of method for improving high methane hyposmosis single coal bed extracting result | |
| CN213275246U (en) | Vibration excitation test experiment system for desorption characteristics of gas-containing coal | |
| CN110095346A (en) | The experimental rig and test method of the rock failure mechanism of rock under high pore pressure and stress wave compound action | |
| Fang et al. | Stress distribution properties and deformation–fracture mechanisms in hydraulic fracturing of coal | |
| CN110231407A (en) | A method of judging carbonate rock effective seal rock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |