CN-122016496-A - CO2Multi-parameter cooperative sensing device and method in coal seam injection process

CN122016496ACN 122016496 ACN122016496 ACN 122016496ACN-122016496-A

Abstract

The invention discloses a multi-parameter collaborative sensing device and a multi-parameter collaborative sensing method in a CO 2 coal seam injection process, which relate to the technical field of carbon sequestration testing and comprise a box body, a hydraulic loading module, a temperature control module, a high-pressure gas control module, a chemical fluid control module, a distributed optical fiber acquisition module, an acoustic emission acquisition module and an upper computer, wherein the hydraulic loading module is arranged on the outer wall of the box body, the confining pressure loading structure can apply pressure to a rock-soil body in the box body, the heat exchange structure is arranged in the confining pressure loading structure, the high-pressure gas control module is implanted into the rock-soil body through a high-pressure gas pipeline, the chemical fluid control module is arranged in the box body through an injection medium output pipeline, the distributed optical fiber acquisition module is distributed in the box body, the multiple sensing optical fibers are distributed in the box body, the multiple-frequency electrical method acquisition module is distributed in the box body, the acoustic emission acquisition module is connected with the confining pressure loading structure, and the upper computer is used for collaborative processing and analyzing the acquired multiple parameters. The invention integrates a multi-source sensing technology and can realize multi-parameter collaborative intelligent sensing and multi-source data fusion processing under the THMC coupling condition.

Inventors

LIU CHANG
LU HAIFENG
XU SHIANG
LI BAIQIANG
LEI JIAN

Assignees

安徽理工大学

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (9)

CO 2 is injected into coal seam process multiparameter collaborative perception device, characterized by comprising: The box body (1), the box body (1) is rectangular, and the inner cavity of the box body is a pressure-bearing cavity capable of being filled with a rock-soil body; the hydraulic loading module is arranged on the outer wall of the box body (1), and the confining pressure loading structure of the hydraulic loading module can apply pressures in the front-back, left-right and up-down directions to a rock-soil body positioned in the box body (1); The heat exchange structure of the temperature control module is arranged inside the confining pressure loading structure, so that heat exchange and temperature control are realized when the confining pressure loading structure abuts against the outer wall of the rock-soil body; The high-pressure gas control module is characterized in that a high-pressure gas pipeline of the high-pressure gas control module extends into the box body (1) and can be implanted into the rock-soil body for CO 2 injection; The injection medium output pipeline of the chemical fluid control module is arranged inside the box body (1) and is used for adding injection medium into the rock-soil body; The distributed optical fiber acquisition module is used for acquiring internal strain and/or temperature information of the rock-soil body, and a plurality of sensing optical fibers of the distributed optical fiber acquisition module are distributed in the internal space of the box body (1); The multi-frequency electric method acquisition module is distributed in the inner space of the box body (1) and is used for applying excitation currents or voltages with different frequencies to the rock-soil body; The acoustic emission probe of the acoustic emission acquisition module is connected to the confining pressure loading structure and is used for receiving acoustic emission signals generated by the rock-soil body in the deformation and destruction process; The upper computer (29), the upper computer (29) is connected in communication with the hydraulic loading module, the temperature control module, the high-pressure gas control module, the chemical fluid control module, the distributed optical fiber acquisition module, the multi-frequency electric method acquisition module and the data output end of the acoustic emission acquisition module are used for cooperatively processing and analyzing a plurality of acquired parameters.
2. The multi-parameter collaborative sensing device for injecting CO 2 into a coal seam according to claim 1, wherein the hydraulic loading module comprises a hydraulic power unit (2), a confining pressure loading unit (3), a stress acquisition unit I (4), a displacement feedback unit (5) and a loading control unit; The confining pressure loading units (3) are multiple groups, each confining pressure loading unit (3) comprises a hydraulic cylinder (31) and an end pressure head (32), the end pressure heads (32) of the confining pressure loading units (3) are uniformly distributed on the top wall, the bottom wall and the side walls of the box body (1) so as to enclose a confining pressure loading structure capable of applying pressure to a rock-soil body in the front-back, left-right and up-down directions, the hydraulic power units (2) are connected with the hydraulic cylinders (31) of the confining pressure loading units (3) to convey hydraulic oil, the hydraulic cylinders (31) of the confining pressure loading units (3) are arranged on the outer wall of the box body (1) and are in one-to-one transmission connection with the end pressure heads (32) to provide pressurizing driving force, the stress acquisition units (4) and the displacement feedback units (5) are arranged on the end surfaces of the end pressure heads (32) far away from the loading pistons (311) at intervals, the loading control units are connected with the hydraulic power units (2), the loading units (3), the loading units (4) are connected with the loading units (29) in a one-to control mode of the loading control unit.
3. The multi-parameter collaborative sensing device for injecting CO 2 into a coal seam according to claim 2, wherein the temperature control module comprises a heating and cooling unit (6), a heat preservation unit (7), a first temperature acquisition unit (8) and a temperature control unit, the heating and cooling unit (6) comprises a circulating liquid supply pipeline (61) and a circulating liquid supply mechanism which are arranged inside the end pressure head (32), the circulating liquid supply mechanism is communicated with the circulating liquid supply pipeline (61) through a pipeline to circularly convey circulating liquid (611), the heat preservation unit (7) is arranged inside the end pressure head (32) and is located on one side, close to the loading piston (311), of the circulating liquid supply pipeline (61), the first temperature acquisition unit (8) comprises a plurality of temperature sensing units (81), the temperature sensing units (81) are arranged on the inner wall of the box (1) and the input end and the output end of the circulating liquid supply pipeline (61), the temperature control unit is in communication connection with the circulating liquid supply mechanism and the temperature sensing units (81) to control the temperature sensing units (29) in a communication mode, and the temperature control unit is connected with the temperature control unit.
4. The multi-parameter collaborative sensing device for injecting CO 2 into a coal seam according to claim 1, wherein the high-pressure gas control module comprises a CO 2 supply unit (9), a pressurization and pressure stabilization unit (10), a flow regulation unit (11), a stress acquisition unit II (12), a temperature acquisition unit II (13) and a high-pressure gas control unit; The CO 2 supply unit (9) is connected with the input end of the pressurizing and stabilizing unit (10), the output end of the pressurizing and stabilizing unit (10) is a CO 2 injection end, the second stress acquisition unit (12) and the second temperature acquisition unit (13) are arranged at the output end of the pressurizing and stabilizing unit (10) and are used for acquiring real-time stress and temperature signals in the injection process, the flow regulating unit (11) is arranged on the pressurizing and stabilizing unit (10) and is used for regulating injection flow, the high-pressure gas control unit is in communication connection with the CO 2 supply unit (9), the pressurizing and stabilizing unit (10), the flow regulating unit (11), the second stress acquisition unit (12) and the second temperature acquisition unit (13) to receive stress and temperature signals and perform injection control, and the upper computer (29) is in communication connection with the high-pressure gas control unit.
5. The multi-parameter collaborative sensing device for injecting CO 2 into a coal seam according to claim 1, wherein the chemical fluid control module comprises a solution configuration unit (14), a component metering and mixing unit (15), a storage unit (16), an addition adjustment unit (17), a discharge and purification unit (18) and a chemical fluid control unit, wherein the solution configuration unit (14) is used for configuring a base solution with set ion concentration, pH and mineralization, the component metering and mixing unit (15) is connected with the solution configuration unit (14) and can quantitatively add and mix acid/alkali, salt solution, buffer solution and additives according to preset proportion, the component metering and mixing unit (15) is communicated with the storage unit (16) through a liquid supply pipeline to supply injection medium, the storage unit (16) is used for stabilizing constant volume storage and components of the injection medium, an on-line monitoring unit (161) used for acquiring chemical parameter feedback signals of the injection medium is arranged in the storage unit (16), one end of the addition adjustment unit (17) is connected with the storage unit (16), the other end of the component metering and mixing unit (15) is arranged in a tank (1) and can be connected with the injection medium to the discharge unit (18) for conducting a real-time reaction and the injection medium is arranged in the discharge and purification unit (1) is connected with the discharge unit, the on-line monitoring unit (161) and the adding and adjusting unit (17) are connected with the chemical fluid control unit in a communication way by the upper computer (29).
6. The multi-parameter collaborative sensing apparatus for injecting CO 2 into a coal seam according to claim 1, wherein the distributed fiber collection module includes a sensing fiber (19), a fiber fixation unit (20), a fiber extraction sealing unit (21), and a demodulation unit (22); The device comprises a plurality of sensing optical fibers (19), a plurality of optical fiber fixing units (20), a plurality of optical fiber leading-out sealing units (21), a plurality of upper computers (29), a plurality of demodulating units (22) and a plurality of temperature distribution strain data, wherein the plurality of sensing optical fibers (19) are arranged inside the box body (1) along the height direction of the box body (1), the plurality of sensing optical fibers (19) are arranged at intervals along the width direction and the length direction of the box body (1), the plurality of optical fiber fixing units (20) are arranged at intervals along the length direction of the sensing optical fibers (19) and can be used for coupling the sensing optical fibers (19) in a rock-soil body, the plurality of optical fiber leading-out sealing units (21) are arranged in a plurality of groups and penetrate through the top wall of the box body (1) in a sealing mode, the lower ends of the plurality of the optical fiber leading-out sealing units (21) are connected with the upper ends of the sensing optical fibers (19) in a one-to-one correspondence mode, the upper computers (29) are in communication connection with the signal output ends of the demodulating units (22), and the signal input ends of the demodulating units (22) are connected with the upper ends of the plurality of the optical fiber leading-out sealing units (21) for demodulating signals.
7. The multi-parameter collaborative sensing device for the coal seam injection process of CO 2 according to claim 1 is characterized in that the multi-frequency electrical method acquisition module comprises a plurality of electrodes (23) and an electrical method instrument (25), the electrodes (23) are distributed in a rock-soil body in a layered and uniform mode, the electrodes (23) are electrically connected with the electrical method instrument (25) through a cable assembly (24), and the upper computer (29) is in communication connection with the electrical method instrument (25).
8. The multi-parameter collaborative sensing device for injecting CO 2 into a coal seam according to claim 1, wherein the acoustic emission collection module comprises a plurality of acoustic emission probes (26), signal transmission lines (27) and acoustic emission collection instruments (28), the acoustic emission probes (26) are closely attached to and uniformly distributed on the side wall of a confining pressure loading structure far away from a rock-soil body, the acoustic emission collection instruments (28) are electrically connected with the acoustic emission probes (26) through the signal transmission lines (27) to collect and store parameters, and the upper computer (29) is in communication connection with the acoustic emission collection instruments (28).
A CO 2 injection coal seam process multiparameter cooperative sensing method, characterized in that the CO 2 injection coal seam process multiparameter cooperative sensing device according to any one of claims 1 to 8 is used, comprising the following steps: S1, presetting sensing optical fibers and electrodes in a box body 1, and arranging an acoustic emission probe outside a confining pressure loading structure Zhou Bibu; s2, stacking similar stratum models in the pressure-bearing cavity according to the actual stratum lithology distribution, and constructing a rock-soil body; S3, starting a hydraulic loading module to enable loading pressure to meet test requirements, starting a temperature control module to heat or cool the box body to a target temperature, starting a chemical fluid control module to inject medium into the rock-soil body, and providing water, heat, force and chemical environment for the rock-soil body; S4, starting a distributed optical fiber acquisition module, a multi-frequency electrical method acquisition module and an acoustic emission acquisition module to acquire multi-field data of acoustic emission signals, temperature data and stress data in real time; S5, starting a high-pressure gas control module, pressurizing and supplying CO 2 gas into the rock-soil body, and collecting multi-field data in real time; And S6, closing the hydraulic loading module after the CO 2 gas supply is completed, removing the confining pressure, photographing and recording the rock-soil body, and carrying out data processing and analysis.

Description

Multi-parameter collaborative sensing device and method for CO 2 coal seam injection process Technical Field The invention relates to the technical field of carbon sequestration testing, in particular to a multi-parameter collaborative sensing device and method for a CO 2 coal seam injection process. Background The injection of CO 2 into deep non-mined coal seams not only can realize the long-term geological sequestration of CO 2, but also can synchronously improve the recovery ratio (ECBM) of coal bed methane, and has become one of the most potential CCUS modes. In the CO 2 injection process, the coal and rock mass is in a high-temperature, high-pressure and high-mineralization fluid environment, a strong coupling effect occurs among a temperature field (T), a seepage field (H), a stress field (M) and a chemical field (C), so that the coal and rock are subjected to complex physicochemical processes such as adsorption expansion, mineral corrosion, crack expansion, permeability evolution and the like, and the accurate evaluation of the compressibility of a coal reservoir, the sealability of a cover layer and the migration and diffusion rule of CO 2 is directly influenced. The existing rock mechanical test device can only realize single physical field or double field (TH, HM, TM and the like) coupling, is difficult to accurately control and maintain a real THMC four-field coupling environment at the same time, and on the monitoring means, the traditional strain gauge, resistivity method, conventional acoustic emission and other sensors have the problems of low spatial resolution, point measurement, incapability of distributed continuous monitoring, difficulty in synchronous acquisition of different physical quantities and the like, and can not perform space-time collaborative sensing and multi-source data fusion on strain-temperature-electrical-acoustic emission multi-field response induced by CO 2 injection, so that the defects of coal fine damage evolution, solute transport mechanism and knowledge of fracture precursor information are serious, and further development of deep coal seam carbon storage potential evaluation, sealing safety evaluation and early leakage early warning technology are restricted. Therefore, it is needed to develop a device and a method for realizing multi-parameter collaborative intelligent sensing, real-time synchronous acquisition and multi-source data fusion processing under the real THMC coupling condition by integrating the multi-source sensing technology at the same time, so as to fill the blank of the prior art and provide key support for the research of the geological storage mechanism of CO 2 and engineering application. Disclosure of Invention In view of this, the present invention provides a multi-parameter collaborative sensing device and method for CO 2 injection into coal seam, which aims to solve at least one of the above technical problems. In order to achieve the above purpose, the present invention adopts the following technical scheme: In one aspect, the invention provides a multi-parameter cooperative sensing device for a CO 2 coal seam injection process, comprising: the box body is rectangular, and the inner cavity of the box body is a pressure-bearing cavity capable of being filled with a rock-soil body; The hydraulic loading module is arranged on the outer wall of the box body, and the confining pressure loading structure of the hydraulic loading module can apply pressure in the front-back, left-right and up-down directions to a rock-soil body positioned in the box body; The heat exchange structure of the temperature control module is arranged inside the confining pressure loading structure, so that heat exchange and temperature control are realized when the confining pressure loading structure abuts against the outer wall of the rock-soil body; The high-pressure gas pipeline of the high-pressure gas control module stretches into the box body and can be implanted into the rock-soil body for CO 2 injection; the injection medium output pipeline of the chemical fluid control module is arranged in the box body and is used for adding injection medium into the rock-soil body; The distributed optical fiber acquisition module is used for acquiring internal strain and/or temperature information of the rock-soil body, and a plurality of sensing optical fibers of the distributed optical fiber acquisition module are distributed in the box body inner space; The multi-frequency electric method acquisition module is distributed in the inner space of the box body and is used for applying excitation currents or voltages with different frequencies to the rock-soil body; The acoustic emission probe of the acoustic emission acquisition module is connected to the confining pressure loading structure and is used for receiving acoustic emission signals generated by the rock-soil body in the deformation and destruction process; The upper computer is in communication connection with t