CN117686399B - A system and method for testing the porosity of in-situ coal using magnetic fluid - Google Patents
A system and method for testing the porosity of in-situ coal using magnetic fluid Download PDFInfo
- Publication number
- CN117686399B CN117686399B CN202311624632.0A CN202311624632A CN117686399B CN 117686399 B CN117686399 B CN 117686399B CN 202311624632 A CN202311624632 A CN 202311624632A CN 117686399 B CN117686399 B CN 117686399B
- Authority
- CN
- China
- Prior art keywords
- magnetic fluid
- borehole
- storage tank
- particle size
- medium
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
本发明公开了一种利用磁流体测试原位煤体孔隙率的系统及方法，系统包括供给子系统和测试子系统；利用煤矿废铁通过破碎、碾磨与离心过程制备中大粒径磁液，同时通过真空蒸发器制备小粒径磁液；通过磁流体输送钻孔压注小粒径磁液，同时启动磁流体靶向控制钻孔内电磁棒，牵引磁液充满目标测试区域内煤体孔隙后，启动磁流体输送钻孔内电磁棒回收磁液；重复上述步骤，向目标测试区域注满中大粒径磁液并回收，基于两次磁液压注体积计算原位煤体孔隙率。本发明利用磁流体作为煤体孔隙纳米探针，实现煤体原位应力条件下的孔隙率低损与精准测试。
The present invention discloses a system and method for testing the porosity of an in-situ coal body using a magnetic fluid. The system includes a supply subsystem and a test subsystem; using coal mine scrap iron to prepare medium and large particle size magnetic fluid through crushing, grinding and centrifugation processes, and preparing small particle size magnetic fluid through a vacuum evaporator; injecting small particle size magnetic fluid through a magnetic fluid delivery borehole, and starting the magnetic fluid targeted control electromagnetic rod in the borehole, and after the magnetic fluid is pulled to fill the coal body pores in the target test area, the electromagnetic rod in the magnetic fluid delivery borehole is started to recover the magnetic fluid; repeating the above steps, filling the target test area with medium and large particle size magnetic fluid and recovering it, and calculating the in-situ coal body porosity based on the two magnetic fluid injection volumes. The present invention uses magnetic fluid as a coal body pore nanoprobe to achieve low-loss and accurate testing of the porosity of the coal body under in-situ stress conditions.
Description
Technical Field
The invention relates to the technical field of mine gas extraction and utilization, in particular to a system and a method for testing in-situ coal porosity by using magnetic fluid.
Background
Coal seam gas is an efficient clean energy source and is also an important dangerous source in the coal mine production process. The efficient extraction of the coal bed gas can help the national 'double carbon' target to be realized, and the occurrence of mine gas disaster accidents can be effectively prevented. The coal contains dual porous media of cracks and pores, the complex pore structure of the coal is used as a gas occurrence space and a migration channel, and the accurate test of the porosity and the crack rate of the coal body is of great significance in grasping the occurrence form and the migration state of the coal bed gas.
The common coal porosity testing methods comprise mercury compression, gas adsorption, nuclear magnetic resonance and the like, have the characteristics of repeatability, sample size, testing range, testing precision and the like, and basically the testing methods are used for sampling on site, so that the sampling process causes secondary disturbance destruction of a coal sample, the primary pore-crack structure of the coal is destroyed, the test result deviates from a true value, the sampling process releases the complex stress state of the coal sample, and even if the laboratory condition considers the stress effect, the actual pore-crack structure of the coal under the in-situ stress constraint condition cannot be truly described.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a system and a method for testing the porosity of an in-situ coal body by using magnetic fluid, wherein a sampling unit and a heating unit are arranged in a shell, and electric energy is provided by a battery pack to drive motors in the heating unit and the sampling unit, so that asphalt to be sampled is extracted and heated, the fluidity of the asphalt is ensured, and the manual operation and transportation are facilitated.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention provides a system for testing the porosity of an in-situ coal body by utilizing magnetic fluid, which comprises a supply subsystem and a test subsystem, wherein the supply subsystem comprises a crusher for inputting coal mine waste iron into a vacuum evaporator and a grinding mill, a surfactant storage tank for inputting surfactant into the vacuum evaporator and the grinding mill, and a base carrier liquid storage tank for inputting base carrier liquid into the vacuum evaporator and the grinding mill;
the testing subsystem comprises a plurality of magnetic fluid targeting control drilling holes which are arranged in an annular array and are arranged in a target coal layer, a magnetic fluid conveying drilling hole is formed in the center of the annular array, and a medium-large-grain-size magnetic fluid storage tank and a small-grain-size magnetic fluid storage tank are communicated with the magnetic fluid conveying drilling hole and are used for transfusion.
Preferably, the distance between the magnetic fluid targeting control drilling holes and the magnetic fluid conveying drilling holes is smaller than or equal to 5m, and the number of the magnetic fluid targeting control drilling holes is not smaller than 8.
The electromagnetic hole sealing device comprises a hollow push rod and a high-power electromagnetic rod which are sequentially and fixedly connected, wherein the high-power electromagnetic rod is close to the bottom of a hole, a protective rubber sleeve is sleeved on the outer wall of the high-power electromagnetic rod, the hollow push rod is fixedly clamped in the hole through two hole sealing plugs sleeved on the outer wall of the hollow push rod, a gas drainage pipe and a magnetic fluid conveying pipe are reserved on the hole sealing plugs, and a grouting hole opening is reserved on a hole sealing section of the hollow push rod between the two hole sealing plugs.
Preferably, the insulated wire connected with the high-power electromagnetic rod passes through the hollow push rod and is electrically connected with the controller.
The invention also provides a using method of the system for testing the porosity of the in-situ coal body by using the magnetic fluid, which comprises the following steps:
S1, putting coal mine waste iron into a crusher, putting tailings into a vacuum evaporator and a grinding mill, and simultaneously adding a surfactant and a base carrier liquid into the vacuum evaporator and the grinding mill through a surfactant storage tank and a base carrier liquid storage tank respectively;
s2, starting a vacuum evaporator and a grinding machine, wherein the vacuum evaporator produces small-particle-size magnetic fluid and stores the small-particle-size magnetic fluid in a small-particle-size magnetic fluid storage tank, the middle-large-particle-size magnetic fluid crude liquid produced by the grinding machine is conveyed into a centrifugal machine to be centrifuged to obtain middle-large-particle-size magnetic fluid and stored in the middle-large-particle-size magnetic fluid storage tank, and the centrifuged large-particle-size magnetic fluid is conveyed into the grinding machine to be re-ground;
s3, constructing magnetic fluid targeting control drilling holes and magnetic fluid conveying drilling holes into the target coal seam, sealing holes in the stratum sections of the drilling holes, and communicating gas drainage pipes in the drilling holes with a gas drainage pipeline to pre-drain gas in the coal seam;
s4, when the change of the gas flow rate of the drilling hole is stable, closing a gas drainage pipe in the magnetic fluid conveying drilling hole, opening the magnetic fluid conveying pipe in the magnetic fluid conveying drilling hole, and injecting the magnetic fluid with small particle size into the annular array inner area, namely the target test area through the magnetic fluid storage tank with small particle size;
s5, when the magnetic fluid flows out of the gas drainage pipe and the magnetic fluid conveying pipe in the magnetic fluid targeting control drilling hole, closing the gas drainage pipe in the magnetic fluid targeting control drilling hole, and starting the high-power electromagnetic rod in the magnetic fluid conveying drilling hole to recover the magnetic fluid with small particle size to the magnetic fluid storage tank with small particle size;
S6, repeating the steps S4-S5, injecting the medium-large particle size magnetic liquid into the target test area through the medium-large particle size magnetic liquid storage tank, recovering the medium-large particle size magnetic liquid, recording the accumulated injection volume V 2, and calculating the porosity of the in-situ coal body based on the twice magnetic liquid injection volumes.
Preferably, in the step S1, water is selected as the base carrier liquid, and oleic acid is selected as the surfactant.
Preferably, the medium-large particle size magnetic liquid and the small particle size magnetic liquid contain iron particle body with the integral number of more than or equal to 30 percent, the volume fraction of the surfactant is more than or equal to 20 percent, and the rest components are base carrier liquid.
Preferably, the particle size of the iron particles in the small-particle-size magnetic liquid is less than or equal to 100nm, and the particle size of the iron particles in the medium-large-particle-size magnetic liquid is greater than or equal to 100nm.
Preferably, in step S6, the calculation formula of the in-situ coal body pore is as follows,
Wherein phi is the total porosity of the coal body, phi f is the fracture rate of the coal body, phi m is the porosity of the coal body matrix, r is the diameter of a target test area circle, and H is the average coal seam thickness.
The method has the advantages that the method utilizes the characteristics of small viscosity of magnetic fluid, strong controllability under an electric field and controllable particle size as a nanoscale probe in a pore test process to realize in-situ coal body diffusion pore-seepage fracture full-scale porosity test, utilizes electromagnet targeting traction magnetic fluid to fully fill the coal body pore fracture, avoids the problem that a traditional high-pressure fluid pressure injection damages a pore fracture structure, realizes low-loss and accurate test of the diffusion pore-seepage fracture full-scale porosity under complex in-situ stress conditions of the coal body, solves the problem that the conventional test method induces secondary damage of the original pore-fracture structure of the coal body in the in-situ sampling and testing process, is difficult to reproduce loaded stress of complex in-situ conditions of the coal body under laboratory test conditions, leads to detachment of constraint stress of the coal body pore fracture, and cannot represent the actual condition in-situ, so that the method realizes the porosity test under the in-situ stress conditions of the coal body porosity, and ensures the reliability, practicability and authenticity of the reference provided for engineering practice by the porosity test result.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of connection relation of a system for testing in-situ coal porosity by using magnetic fluid according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an electromagnetic hole sealing device according to an embodiment of the present invention.
In the figure, 1-coal mine waste iron, 2-surfactant storage tank, 3-base carrier liquid storage tank, 4-vacuum evaporator, 5-crusher, 6-mill, 7-centrifuge, 8-medium and large particle size magnetic liquid storage tank, 9-small particle size magnetic liquid storage tank, 10-target coal seam, 11-magnetic fluid targeting control drilling, 12-target test area, 13-magnetic fluid conveying drilling, 14-rock stratum, 15-gas drainage pipe, 16-magnetic fluid conveying pipe, 17-insulated wire, 18-grouting orifice, 19-hole sealing plug, 20-hollow push rod, 21-protective rubber sleeve and 22-high power electromagnetic rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 2, a system for testing the porosity of an in-situ coal body by using magnetic fluid comprises a multi-stage particle size magnetic fluid supply subsystem and an in-situ coal body porosity testing subsystem, which are hereinafter referred to as the supply subsystem and the testing subsystem;
The feeding subsystem comprises a crusher 5 for inputting coal mine waste iron 1 to a vacuum evaporator 4 and a grinding machine 6, a surfactant storage tank 2 for inputting surfactant to the vacuum evaporator 4 and the grinding machine 6, and a base carrier liquid storage tank 3 for inputting base carrier liquid to the vacuum evaporator 4 and the grinding machine 6, wherein an outlet of the vacuum evaporator 4 is communicated with a small-particle-size magnetic liquid storage tank 9, the grinding machine 6 is also communicated with a centrifugal machine 7, and an outlet of the centrifugal machine 7 is communicated with a medium-large-particle-size magnetic liquid storage tank 8;
The testing subsystem comprises a plurality of magnetic fluid targeting control drilling holes 11 which are arranged in an annular array and are arranged in a target coal seam 10, a magnetic fluid conveying drilling hole 13 is formed in the center of the annular array, and a medium-large-particle-size magnetic fluid storage tank 8 and a small-particle-size magnetic fluid storage tank 9 are communicated with the magnetic fluid conveying drilling hole 13 and are used for transfusion.
The distance between the magnetic fluid targeting control drilling holes 11 and the magnetic fluid conveying drilling holes 13 is smaller than or equal to 5m, and the number of the magnetic fluid targeting control drilling holes 11 is not smaller than 8.
The magnetic fluid targeting control drilling hole 11 and the magnetic fluid conveying drilling hole 13 are internally provided with electromagnetic hole sealing devices, each electromagnetic hole sealing device comprises a hollow push rod 20 and a high-power electromagnetic rod 22 which are sequentially and fixedly connected, the high-power electromagnetic rod 22 is close to the hole bottom, the outer wall of the high-power electromagnetic rod is sleeved with a protective rubber sleeve 21, the hollow push rod 20 is fixedly clamped in a hole through two hole sealing plugs 19 sleeved on the outer wall, a gas drainage pipe 15 and a magnetic fluid conveying pipe 16 are reserved on the hole sealing plugs 19, and a grouting hole 18 is reserved on a hole sealing section of the hollow push rod 20 between the two hole sealing plugs 19.
The insulated wire 17 connected with the high-power electromagnetic rod 22 passes through the hollow push rod 20 and is electrically connected with the controller.
The embodiment of the invention also provides a using method of the system for testing the porosity of the in-situ coal body by using the magnetic fluid, which comprises the following steps:
S1, putting coal mine waste iron 1 into a crusher 5, putting tailings into a vacuum evaporator 4 and a grinding mill 6, and simultaneously adding a surfactant and a base carrier liquid into the vacuum evaporator 4 and the grinding mill 6 through a surfactant storage tank 2 and a base carrier liquid storage tank 3 respectively;
S2, starting the vacuum evaporator 4 and the grinding machine 6, wherein the vacuum evaporator 4 produces small-particle-size magnetic fluid and stores the small-particle-size magnetic fluid in a small-particle-size magnetic fluid storage tank 9, the medium-large-particle-size magnetic fluid crude fluid produced by the grinding machine 6 is conveyed into a centrifugal machine 7 to be centrifuged to obtain medium-large-particle-size magnetic fluid and stored in a medium-large-particle-size magnetic fluid storage tank 8, and the centrifuged large-particle-size magnetic fluid is conveyed into the grinding machine 6 to be re-ground;
s3, constructing a magnetic fluid targeting control drilling hole 11 and a magnetic fluid conveying drilling hole 13 into the target coal seam 10, sealing holes of all drilling holes in a rock stratum 14 section, and communicating a gas drainage pipe 15 in each drilling hole with a gas drainage pipeline to pre-drain gas in the coal seam;
S4, when the change of the gas flow rate of the drilling hole is stable, closing a gas drainage pipe 15 in the magnetic fluid conveying drilling hole 13, opening a magnetic fluid conveying pipe 16 in the magnetic fluid conveying drilling hole 13, and injecting small-particle-size magnetic fluid into the annular array inner area, namely the target test area 12 through a small-particle-size magnetic fluid storage tank 9;
S5, when the magnetic fluid flows out of the gas drainage pipe 15 and the magnetic fluid conveying pipe 16 in the magnetic fluid targeting control drilling hole 11, closing the gas drainage pipe 15 in the magnetic fluid targeting control drilling hole 11, and starting the high-power electromagnetic rod 22 in the magnetic fluid conveying drilling hole 13 to recover the magnetic fluid with small particle size to the magnetic fluid storage tank 9 with small particle size;
s6, repeating the steps S4-S5, injecting the medium-large particle size magnetic liquid into the target test area 12 through the medium-large particle size magnetic liquid storage tank 8, recovering, recording the accumulated injection volume V 2, and calculating the porosity of the in-situ coal body based on the two magnetic liquid injection volumes.
In the step S1, water is selected as the base carrier liquid, and oleic acid is selected as the surfactant.
The magnetic liquid with medium and large particle sizes and the magnetic liquid with small particle sizes contain iron particle body with the integral number of more than or equal to 30 percent, the volume fraction of the surfactant with the volume fraction of more than or equal to 20 percent, and the rest components are base carrier liquid.
The particle size of the iron particles in the small-particle-size magnetic liquid is smaller than or equal to 100nm, and the particle size of the iron particles in the medium-large-particle-size magnetic liquid is larger than or equal to 100nm.
In the step S6, the calculation formula of the in-situ coal body pore is as follows,
Wherein phi is the total porosity of the coal body, phi f is the fracture rate of the coal body, phi m is the porosity of the coal body matrix, r is the diameter of a target test area circle, and H is the average coal seam thickness.
The invention uses the characteristics of small viscosity of the magnetic fluid, strong controllability under an electric field and controllable particle size of particles as the nano probe in the pore test process, realizes the low-loss and accurate test of the pore and fracture rate of the coal under the in-situ stress condition, and ensures the reliability, the practicability and the authenticity of the reference provided by the porosity test result for engineering practice.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311624632.0A CN117686399B (en) | 2023-11-30 | 2023-11-30 | A system and method for testing the porosity of in-situ coal using magnetic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311624632.0A CN117686399B (en) | 2023-11-30 | 2023-11-30 | A system and method for testing the porosity of in-situ coal using magnetic fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117686399A CN117686399A (en) | 2024-03-12 |
| CN117686399B true CN117686399B (en) | 2025-04-11 |
Family
ID=90134443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311624632.0A Active CN117686399B (en) | 2023-11-30 | 2023-11-30 | A system and method for testing the porosity of in-situ coal using magnetic fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117686399B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095398A (en) * | 2019-05-05 | 2019-08-06 | 三峡大学 | Utilize the device and method of magnetic fluid measurement porosity |
| CN115980172A (en) * | 2022-10-20 | 2023-04-18 | 中煤科工西安研究院(集团)有限公司 | Coal seam roof fractured rock mass grouting track tracing system and slurry selecting method |
| CN116413184A (en) * | 2021-12-31 | 2023-07-11 | 中国石油天然气股份有限公司 | Method for rapidly evaluating total porosity, hydrocarbon-containing porosity and permeability of shale |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7075297B2 (en) * | 2002-08-09 | 2006-07-11 | Schlumberger Technology Corporation | Combining NMR, density, and dielectric measurements for determining downhole reservoir fluid volumes |
| US7126340B1 (en) * | 2005-09-30 | 2006-10-24 | Saudi Arabian Oil Company | Method to characterize microfractured hydrocarbon reservoirs by artificially induced anisotropy of magnetic susceptibility |
| US8230918B2 (en) * | 2007-05-24 | 2012-07-31 | Saudi Arabian Oil Company | Method of characterizing hydrocarbon reservoir fractures in situ with artificially enhanced magnetic anisotropy |
-
2023
- 2023-11-30 CN CN202311624632.0A patent/CN117686399B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095398A (en) * | 2019-05-05 | 2019-08-06 | 三峡大学 | Utilize the device and method of magnetic fluid measurement porosity |
| CN116413184A (en) * | 2021-12-31 | 2023-07-11 | 中国石油天然气股份有限公司 | Method for rapidly evaluating total porosity, hydrocarbon-containing porosity and permeability of shale |
| CN115980172A (en) * | 2022-10-20 | 2023-04-18 | 中煤科工西安研究院(集团)有限公司 | Coal seam roof fractured rock mass grouting track tracing system and slurry selecting method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117686399A (en) | 2024-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113294134B (en) | Hydraulic fracturing and methane in-situ blasting synergistic fracturing permeability-increasing method | |
| Fan et al. | Enhancing coalbed methane recovery with liquid CO2 fracturing in underground coal mine: From experiment to field application | |
| CN106948816B (en) | Automatic energy storage high pressure fluid injection CO2Phase conversion pulse coal and rock fracturing method | |
| CN105625946B (en) | Coal bed gas horizontal well supercritical CO2Jet stream makes chamber and multistage synchronizes explosion fracturing method | |
| CN107462472B (en) | An experimental simulation device and simulation method for thermal-pressure pulse combined fracturing of coal | |
| CN110359913B (en) | Safe and efficient mining method for improving permeability of low-permeability sandstone type uranium deposit | |
| CN111119982A (en) | In-situ pyrolysis gas fluidized mining method for high gas coal seam | |
| CN112145144B (en) | A composite fracturing reconstruction system and method based on multi-stage liquid CO2 phase transition | |
| CN113621399B (en) | Supercritical water-oxygen reaction device for L-shaped powder or block organic rock and use method thereof | |
| CN106894799B (en) | A device and method for using supercritical carbon dioxide to displace coal seam gas | |
| CN108252700A (en) | A kind of shale oil-gas reservoir heat of oxidation swashs explosion remodeling method | |
| CN106437667B (en) | Vortex heating oil shale underground in-situ mining method | |
| CN103790552B (en) | A kind of method of the lock that dewaters for high temperature solution in oil-gas mining process | |
| CN107436262A (en) | Low temperature liquid nitrogen fracturing experiments system under confined pressure | |
| CN117686399B (en) | A system and method for testing the porosity of in-situ coal using magnetic fluid | |
| CN111894550B (en) | A simulation test system and method for upward drilling low temperature fluid fracturing | |
| CN114183115B (en) | A system and method for efficient recovery of natural gas hydrate | |
| CN118258648B (en) | A new exploration sampling device for supercritical thermal fluid and its application | |
| Xiao et al. | Orthogonal experimental investigation on permeability evolution of unconsolidated sandstones during geothermal fluid reinjection: A case study in the Minghuazhen Formation, Tianjin, China | |
| CN107191218B (en) | Suspended slag water seal blasting permeability increasing and gas extraction method | |
| CN105717255A (en) | Composite solvent soaking huff-puff circulation experiment device and simulated mining method | |
| KR101309358B1 (en) | Apparatus for measuring decomposition speed of gas hydrate | |
| LI et al. | Challenges and countermeasures in salt cavern underground storage in China—from “Jintan mode” to “XX mode” | |
| CN117211749A (en) | Concentric single-hole drilling system for in-situ pyrolysis oil extraction of oil-rich coal and in-situ pyrolysis oil extraction method | |
| CN115142830A (en) | Yield and efficiency increasing method for fracturing and reforming heavy oil reservoir |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |