CN113740513A - In-situ CT (computed tomography) online scanning displacement experiment system and application method - Google Patents
In-situ CT (computed tomography) online scanning displacement experiment system and application method Download PDFInfo
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Abstract
The invention discloses an in-situ CT (computed tomography) online scanning displacement experiment system and an application method. The in-situ CT online scanning displacement experiment system comprises a scanning system and an external system. The method realizes coal rock in-situ CT online displacement scanning through a scanning system, realizes the displacement experiment of the core under the condition of constant temperature and constant pressure through an external system, and finally realizes the gas-liquid phase single-phase displacement experiment and the gas-liquid phase mixed-phase displacement experiment in-situ CT online scanning of the core under the condition of three axes under the high-efficiency cooperation of two system devices to obtain a real-time image of the core micro-perforation fracture structure and the fluid-solid medium evolution in the full stress-strain process under the condition of three axes loading.
Description
Technical Field
The invention relates to an in-situ CT (computed tomography) online scanning displacement experiment system and a method for applying the same.
Background
The method has great significance for the fields of coal bed gas exploitation and oil gas exploration by effectively representing the real pore structure characteristics of the rock core in the in-situ environment. At present, there are many methods for characterizing the pore structure of the core, such as SEM, NMR, CT, etc., wherein the development of CT (computed tomography) is of great interest. The existing CT scanning technology can reach the nanometer level in precision under the condition of a micro rock core, but the technical bottleneck still exists for realizing gas, liquid and solid online displacement scanning under the condition of a full rock core in-situ reservoir. Based on the above situation, an in-situ CT online scanning displacement experiment system is urgently needed, which can perform the same-step gas, liquid and solid-phase miscible displacement experiment under a triaxial condition, invert the in-situ reservoir condition of the rock core, and can obtain the microstructure characteristics of the hollow fracture inside the rock core and the micro migration rule and distribution characteristics of the multiphase fluid with high precision and short time consumption.
Disclosure of Invention
The method comprises the steps of realizing in-situ CT (computed tomography) online displacement scanning of the core through a scanning mechanism, realizing in-situ CT online displacement scanning of the core through a scanning system, realizing displacement experiments of the core under the conditions of constant temperature and constant pressure through an external system, and finally realizing in-situ CT online scanning of the core under the condition of three axes, gas-liquid phase single-phase displacement experiments and gas-liquid phase mixed-phase displacement experiments under the efficient cooperation of two system devices to obtain a real-time image of the micro-perforation fracture structure of the core and the evolution of a fluid solid medium in the full stress-strain process under the condition of three-axis loading. In order to achieve the purpose, the invention adopts the following technical scheme:
an in-situ CT online scanning displacement experiment system comprises:
the scanning system comprises a rock core holder, an axial pressure liquid inlet, a confining pressure liquid outlet, a confining pressure liquid inlet, a displacement air inlet, a base, a displacement liquid inlet, a displacement liquid outlet, a displacement air outlet, a rock core rubber sleeve, a confining pressure chamber, a rock core, an annular ray receiver, an automatic telescopic rotating three-phase ray source, a rotating track, a clamping groove, a sample table, a central controller and a connecting line; the external system comprises a displacement device, a displacement liquid storage tank, a displacement gas cylinder, a constant-temperature and constant-pressure circulating device and a pipeline, wherein the central controller is arranged in the left front of the core holder, the displacement device is arranged in the left side of the core holder, the displacement liquid storage tank is arranged on the displacement device, the displacement gas cylinder is arranged in the left side of the displacement device, the constant-temperature and constant-pressure circulating device is arranged on the right side of the core holder, the core holder is arranged on the upper part of the sample table and is fixedly connected with the sample table through the base, the rotary track is arranged on the periphery of the sample table, is internally provided with the clamping groove and is connected with the central controller through the connecting wire, the automatic telescopic rotary three-phase ray source is connected with the clamping groove of the rotary track, the annular ray receiver is arranged on the periphery of the rotary track and is connected with the central controller through the connecting wire, the axial pressure inlet is arranged at the left upper part of the core holder, the confining pressure liquid outlet is arranged at the left upper part of the core holder and is positioned below the axial pressure inlet, the confining pressure liquid inlet is arranged at the left lower part of the core holder and is positioned above the displacement air inlet, the displacement air inlet is arranged at the left lower part of the core holder, the displacement liquid inlet is arranged at the right lower part of the core holder, the displacement liquid outlet is arranged at the top of the core holder, the displacement air outlet is arranged at the right upper part of the core holder, the core rubber sleeve and the confining pressure chamber are arranged in the core holder, the core is arranged in the core rubber sleeve, the displacement device is connected with the displacement liquid storage tank through a pipeline, and the displacement liquid storage tank is respectively connected with the displacement liquid inlet and the axial pressure liquid inlet through pipelines, the displacement gas cylinder is connected with the displacement gas inlet through the pipeline, and the constant-temperature and constant-pressure circulating device is respectively connected with the confining pressure liquid inlet and the confining pressure liquid outlet through the pipeline.
Preferably, the core holder is provided with the axial pressure liquid inlet, the confining pressure liquid outlet, the confining pressure liquid inlet, the displacement air inlet, the displacement liquid outlet and the displacement air outlet, is fixedly connected with the sample stage through the base, and is made of a high-strength transparent material.
Preferably, the automatic telescopic rotating three-phase ray source is connected with the rotating track in a clamping groove mode through the clamping groove, and the rotating track is connected with the central controller through the connecting line.
Preferably, the annular ray receiver is arranged at the periphery of the rotating track and is connected with the central controller through the connecting line.
The invention also provides an application method of the in-situ CT online scanning displacement experiment system, which comprises the following working steps:
a. determining the temperature and the confining pressure required by the experiment according to the rock core and formation conditions, and determining displacement parameters;
b. fixing the core holder on a sample table, connecting an experimental device, applying axial pressure to the core through the displacement device and the pipeline according to a determined experimental scheme, applying confining pressure to the core through the constant-temperature constant-pressure circulating device and the pipeline, and maintaining the required temperature;
c. performing a gas-phase single-phase displacement experiment, a liquid-phase single-phase displacement experiment or a gas-liquid mixed-phase displacement experiment on the rock core through the pipeline according to a determined experiment scheme;
d. setting scanning parameters, stopping fluid injection, performing rotary scanning along the rotary track through the automatic telescopic rotary three-phase ray source at a preset scanning node in an experimental scheme, and synchronously receiving gas, liquid and solid three-phase ray signals by the annular ray receiver and transmitting the signals to the central controller for imaging;
e. after the scanning is finished, continuing the fluid injection experiment, and repeating the steps d-e when a scanning node is preset in the next experiment scheme;
f. and recovering outlet fluid through the displacement liquid outlet until the experiment is finished.
The invention has the following advantages:
the in-situ CT online scanning displacement experiment system provided by the invention is provided with a scanning system and an external system, wherein the temperature and the confining pressure are set according to the formation condition of the core, and the core holder is used for placing the core under the in-situ reservoir condition through the combined action of the axial pressure liquid inlet, the confining pressure liquid outlet and the pipeline, and can be used for carrying out a gas-phase single-phase displacement experiment, a liquid-phase single-phase displacement experiment and a gas-liquid mixed-phase displacement experiment. The automatic telescopic rotating three-phase ray source can respectively identify solid-phase substances, liquid-phase substances and gas-phase substances, can accurately distinguish different phase-state substances in the rock core, improves scanning precision, can adjust the height of the rock core according to the height and the size of the rock core, and can rotate and scan along the rotating track, so that the problem of pipeline winding caused by self-rotation in the scanning process of the rock core holder can be effectively avoided. And the annular ray receiver synchronously receives gas, liquid and solid three-phase ray signals transmitted by the automatic telescopic rotating three-phase ray source and transmits the signals to the central controller for imaging, so that the internal condition of the rock core in a displacement state can be seen at any time.
Drawings
FIG. 1 is an overall state diagram in an embodiment of the present invention.
In the figure: 1-1 core holder; 1-2 ring ray receivers; 1-3, automatically telescoping and rotating a three-phase ray source; 1-4 sample stage; 1-5 central controller; 0-1 connecting line; 1-1-1 axial pressure liquid inlet; 1-1-2 confining pressure liquid outlet; 1-1-3 confining pressure liquid inlet; 1-1-4 displacement of the air inlet; 1-1-5 bases; 1-1-6 displacing the liquid inlet; 1-1-7 displacement of the liquid outlet; 1-1-8 displacement of the air outlet; 1-1-9 core rubber sleeve; 1-1-10 confining chambers; 1-1-11 core; 1-3-1 rotation orbit; 1-3-2 card slots; 2-a displacement device; 2-1 displacing the liquid storage tank; 2-2 displacing the gas cylinder; 0-2 lines; 3-constant temperature and pressure circulating device.
Detailed Description
Referring to fig. 1, an in-situ CT online scanning displacement experiment system includes a scanning system and an external system. The in-situ CT online displacement scanning of the rock core is realized through a scanning system, the displacement experiment of the rock core under the conditions of constant temperature and constant pressure is realized through an external system, and finally, the gas-liquid phase single-phase displacement experiment and the gas-liquid phase mixed-phase displacement experiment in-situ CT online scanning of the rock core under the condition of three axes are realized under the high-efficiency cooperation of two large system devices, so that a real-time image of the micro-observation hole fracture structure and the solid-fluid medium evolution of the rock core in the full stress and strain process under the condition of three-axis loading is obtained.
In the scanning system, the central controller 1-5 is arranged in front of the left side of the core holder 1-1, the core holder 1-1 is arranged on the sample table 1-4 and is fixedly connected with the sample table 1-4 through the base 1-1-5, the rotating track 1-3-1 is arranged on the periphery of the sample table 1-4 and is internally provided with the clamping groove 1-3-2 and is connected with the central controller 1-5 through the connecting line 0-1, the automatic telescopic rotating three-phase ray source 1-3 is connected with the rotating track 1-3-1 in a clamping groove manner, the annular ray receiver 1-2 is arranged on the periphery of the rotating track 1-3-1 and is connected with the central controller 1-5 through the connecting line 0-1, the axial pressure liquid inlet 1-1-1 is arranged at the left upper part of the core holder 1-1, the confining pressure liquid outlet 1-1-2 is arranged at the left upper part of the core holder 1-1 and is positioned below the axial pressure liquid inlet 1-1-1, the confining pressure liquid inlet 1-1-3 is arranged at the left lower part of the core holder 1-1 and is positioned above the displacement air inlet 1-1-4, the displacement air inlet 1-1-4 is arranged at the left lower part of the core holder 1-1, the displacement liquid inlet 1-1-6 is arranged at the right lower part of the core holder 1-1, the displacement liquid outlet 1-1-7 is arranged at the top of the core holder 1-1, and the displacement air outlet 1-1-8 is arranged at the right upper part of the core holder 1-1, the core rubber sleeve 1-1-9 and the confining pressure chamber 1-1-10 are arranged inside the core holder 1-1, and the core 1-1-11 is arranged inside the core rubber sleeve 1-1-9;
in an external system, the displacement device 2 is arranged on the left side of the core holder 1-1, the displacement liquid storage tank 2-1 is arranged on the displacement device 2, the displacement gas cylinder 2-2 is arranged on the left side of the displacement device 2, the constant-temperature and constant-pressure circulating device 3 is arranged on the right side of the core holder 1-1, the displacement device 2 is connected with the displacement liquid storage tank 2-1 through the pipeline 0-2, the displacement liquid storage tank 2-1 and the displacement gas cylinder 2-2 are arranged on the left side of the core holder 1-1, the displacement liquid storage tank 2-1 is respectively connected with the displacement liquid inlet 1-1-6 and the axial pressure liquid inlet 1-1-1 through the pipeline 0-2, the displacement gas cylinder 2-2 is connected with the displacement gas inlet 1-1-4 through the pipeline 0-2, the constant-temperature and constant-pressure circulating device 3 is arranged on the right side of the core holder 1-1, and the constant-temperature and constant-pressure circulating device 3 is respectively connected with the confining pressure liquid inlet 1-1-3 and the confining pressure liquid outlet 1-1-2 through the pipelines 0-2.
The method comprises the following specific steps:
a. determining the temperature and the confining pressure required by the experiment according to the formation conditions of the rock cores 1-1-11, and determining displacement parameters;
b. fixing the core holder 1-1 on the sample table 1-4, connecting an experimental device, applying axial pressure to the cores 1-1-11 through the displacement device 2 and the pipelines 0-2 according to a determined experimental scheme, applying confining pressure to the cores 1-1-11 through the constant-temperature constant-pressure circulating device 3 and the pipelines 0-2, and maintaining the required temperature;
c. according to a determined experimental scheme, performing a gas-phase single-phase displacement experiment, a liquid-phase single-phase displacement experiment or a gas-phase and liquid-phase mixed-phase displacement experiment on the rock cores 1-1-11 through the pipelines 0-2;
d. setting scanning parameters, stopping fluid injection, performing rotary scanning along the rotary track 1-3-1 through the automatic telescopic rotary three-phase ray source 1-3 at a preset scanning node in an experimental scheme, and synchronously receiving gas, liquid and solid three-phase ray signals by the annular ray receiver 1-2 and transmitting the signals to the central controller 1-5 for imaging;
e. after the scanning is finished, continuously injecting the fluid, and repeating the steps d-e when a scanning node is preset in the next experimental scheme;
f. the outlet fluid is recovered through the displacement fluid outlet 1-1-6 until the end of the experiment.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. The utility model provides an online scanning displacement experimental system of normal position CT which characterized in that: the in-situ CT online scanning displacement experiment system comprises:
the scanning system comprises a rock core holder, an axial pressure liquid inlet, a confining pressure liquid outlet, a confining pressure liquid inlet, a displacement air inlet, a base, a displacement liquid inlet, a displacement liquid outlet, a displacement air outlet, a rock core rubber sleeve, a confining pressure chamber, a rock core, an annular ray receiver, an automatic telescopic rotating three-phase ray source, a rotating track, a clamping groove, a sample table, a central controller and a connecting line; the external system comprises a displacement device, a displacement liquid storage tank, a displacement gas cylinder, a constant-temperature and constant-pressure circulating device and a pipeline, wherein the central controller is arranged in the left front of the core holder, the displacement device is arranged in the left side of the core holder, the displacement liquid storage tank is arranged on the displacement device, the displacement gas cylinder is arranged in the left side of the displacement device, the constant-temperature and constant-pressure circulating device is arranged on the right side of the core holder, the core holder is arranged on the upper part of the sample table and is fixedly connected with the sample table through the base, the rotary track is arranged on the periphery of the sample table, is internally provided with the clamping groove and is connected with the central controller through the connecting wire, the automatic telescopic rotary three-phase ray source is connected with the clamping groove of the rotary track, the annular ray receiver is arranged on the periphery of the rotary track and is connected with the central controller through the connecting wire, the axial pressure inlet is arranged at the left upper part of the core holder, the confining pressure liquid outlet is arranged at the left upper part of the core holder and is positioned below the axial pressure inlet, the confining pressure liquid inlet is arranged at the left lower part of the core holder and is positioned above the displacement air inlet, the displacement air inlet is arranged at the left lower part of the core holder, the displacement liquid inlet is arranged at the right lower part of the core holder, the displacement liquid outlet is arranged at the top of the core holder, the displacement air outlet is arranged at the right upper part of the core holder, the core rubber sleeve and the confining pressure chamber are arranged in the core holder, the core is arranged in the core rubber sleeve, the displacement device is connected with the displacement liquid storage tank through a pipeline, and the displacement liquid storage tank is respectively connected with the displacement liquid inlet and the axial pressure liquid inlet through pipelines, the displacement gas cylinder is connected with the displacement gas inlet through the pipeline, and the constant-temperature and constant-pressure circulating device is respectively connected with the confining pressure liquid inlet and the confining pressure liquid outlet through the pipeline.
2. The in-situ CT online scanning displacement experiment system as recited in claim 1, wherein: the core holder is provided with the axial pressure liquid inlet, the confining pressure liquid outlet, the confining pressure liquid inlet, the displacement air inlet, the displacement liquid outlet and the displacement air outlet, is fixedly connected with the sample stage through the base, and is made of high-strength transparent materials.
3. The in-situ CT online scanning displacement experiment system as recited in claim 1, wherein: the automatic telescopic rotating three-phase ray source is connected with the rotating track in a clamping groove mode through the clamping groove, and the rotating track is connected with the central controller through the connecting wire.
4. The in-situ CT online scanning displacement experiment system as recited in claim 1, wherein: the annular ray receiver is arranged on the periphery of the rotating track and is connected with the central controller through the connecting line.
5. An in-situ CT online scanning displacement experiment system application method, which is characterized in that the in-situ CT online scanning displacement experiment system of any one of claims 1 to 4 is adopted, and comprises the following steps:
a. determining the temperature and the confining pressure required by the experiment according to the rock core and formation conditions, and determining displacement parameters;
b. fixing the core holder on a sample table, connecting an experimental device, applying axial pressure to the core through the displacement device and the pipeline according to a determined experimental scheme, applying confining pressure to the core through the constant-temperature constant-pressure circulating device and the pipeline, and maintaining the required temperature;
c. performing a gas-phase single-phase displacement experiment, a liquid-phase single-phase displacement experiment or a gas-liquid mixed-phase displacement experiment on the rock core through the pipeline according to a determined experiment scheme;
d. setting scanning parameters, stopping fluid injection, performing rotary scanning along the rotary track through the automatic telescopic rotary three-phase ray source at a preset scanning node in an experimental scheme, and synchronously receiving gas, liquid and solid three-phase ray signals by the annular ray receiver and transmitting the signals to the central controller for imaging;
e. after the scanning is finished, continuing the fluid injection experiment, and repeating the steps d-e when a scanning node is preset in the next experiment scheme;
f. and recovering outlet fluid through the displacement liquid outlet until the experiment is finished.
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