CN113740513B - In-situ CT online scanning displacement experiment system and application method - Google Patents
In-situ CT online scanning displacement experiment system and application method Download PDFInfo
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- CN113740513B CN113740513B CN202111052222.4A CN202111052222A CN113740513B CN 113740513 B CN113740513 B CN 113740513B CN 202111052222 A CN202111052222 A CN 202111052222A CN 113740513 B CN113740513 B CN 113740513B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
Abstract
The invention discloses an in-situ CT 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. According to the invention, the in-situ CT (computed tomography) on-line displacement scanning of the coal rock is realized through the scanning system, the displacement experiment of the rock core under the condition of constant temperature and constant pressure is realized through the external system, and finally, the in-situ CT on-line scanning of the rock core under the triaxial condition, the gas-liquid phase single-phase displacement experiment and the gas-liquid phase mixed-phase displacement experiment are realized under the efficient cooperation of two large system devices, so that the real-time image of the microscopic hole fracture structure of the rock core and the evolution of the fluid-solid medium in the full-stress strain process under the triaxial loading condition is obtained.
Description
Technical Field
The invention relates to an in-situ CT online scanning displacement experiment system and a method for applying the same.
Background
The method has the advantages that under the in-situ environment, the real pore fracture structural characteristics of the rock core are effectively represented, and the method has great significance in the field of coal bed gas exploitation and oil gas exploration. Currently, there are many methods for characterizing the pore structure of the core, such as SEM, NMR, CT, etc., in which the development of CT (computed tomography) is a great concern. The existing CT scanning technology can reach the nanometer level in accuracy under the condition of the micro-core, but the technology bottleneck still exists for realizing gas, liquid and solid online displacement scanning under the condition of the full-core in-situ reservoir. Based on the above situation, an in-situ CT online scanning displacement experiment system is urgently needed, gas, liquid and solid phase mixed phase displacement experiments are synchronously carried out under the triaxial condition, the in-situ reservoir condition of the rock core is inverted, and the microstructure characteristics of the empty fissures in the rock core, the microscopic migration rules and distribution characteristics of multiphase fluid can be obtained with high precision and short time consumption.
Disclosure of Invention
According to the method, the in-situ CT on-line displacement scanning of the rock core is realized through the scanning mechanism, the in-situ CT on-line displacement scanning of the rock core is realized through the scanning system, the displacement experiment of the rock core under the constant temperature and constant pressure condition is realized through the external system, and finally, under the efficient cooperation of two large system devices, the in-situ CT on-line scanning of the rock core under the triaxial condition, the gas-liquid phase single-phase displacement experiment and the gas-liquid phase mixed-phase displacement experiment are realized, so that real-time images of the microscopic hole fracture structure of the rock core and the evolution of the fluid-solid medium in the full-stress strain process are obtained under the triaxial loading condition. In order to achieve the above purpose, the invention adopts the following technical scheme:
an in situ CT on-line scanning displacement experiment system comprising:
the scanning system comprises a 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 core rubber sleeve, a confining pressure chamber, a 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 at the left front of the core holder, the displacement device is arranged at the left side of the core holder, the displacement liquid storage tank is arranged on the displacement device, the displacement gas cylinder is arranged at the left side of the displacement device, the constant temperature and constant pressure circulating device is arranged at the right side of the core holder, the core holder is arranged at the upper part of the sample table and fixedly connected with the sample table through a base, the rotary track is arranged at the periphery of the sample table and internally provided with a clamping groove and connected with the central controller through a 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 at the periphery of the rotary track and connected with the central controller through the connecting wire, the axial pressure liquid inlet is arranged at the left upper part of the core holder, the axial pressure liquid outlet is arranged at the left upper part of the core holder and is arranged at the lower part of the core holder, the axial liquid inlet is fixedly connected with the sample table, the rotary three-phase ray source is arranged at the periphery of the rotary track, the rotary three-phase ray source is arranged at the core inlet and the core inlet, the core holder is arranged at the core inlet and the core inlet is arranged at the right side of the core holder, the displacement liquid storage tank is connected with the displacement liquid inlet and the axial pressure liquid inlet respectively through the pipeline, the displacement gas cylinder is connected with the displacement gas inlet through the pipeline, and the constant temperature and constant pressure circulating device is connected with the confining pressure liquid inlet and the confining pressure liquid outlet respectively 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, and is fixedly connected with the sample table through the base, and is made of high-strength transparent materials.
Preferably, the automatic telescopic rotating three-phase ray source is connected with the rotating track through the clamping groove, and the rotating track is connected with the central controller through the connecting wire.
Preferably, the annular ray receiver is arranged at the periphery of the rotating track and is connected with the central controller through the connecting wire.
The invention also provides an application method of the in-situ CT online scanning displacement experiment system, and the application of the system comprises the following working steps:
a. determining the temperature and confining pressure required by the experiment according to the rock core stratum condition, 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 set experimental scheme, applying confining pressure to the core through the constant temperature and constant pressure circulating device and the pipeline, and maintaining the required temperature;
c. according to the determined experimental scheme, performing a gas phase single-phase displacement experiment, a liquid phase single-phase displacement experiment or a gas-liquid phase mixed phase displacement experiment on the rock core through the pipeline;
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 gas, liquid and solid three-phase ray signals to the central controller for imaging;
e. d, 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 experimental scheme;
f. and recycling 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 confining pressure are set according to the stratum condition of the rock core, and the rock core holder can enable the rock core to be placed in the state of an in-situ reservoir condition through the combined action of the axial pressure liquid inlet, the confining pressure liquid outlet and the pipeline, and can perform a gas-phase single-phase displacement experiment, a liquid-phase single-phase displacement experiment and a gas-liquid phase mixed phase displacement experiment. The automatic telescopic rotating three-phase ray source can respectively identify solid phase, liquid phase and gas phase substances, can more accurately distinguish different phase substances in the core, improves scanning accuracy, can adjust the height of the automatic telescopic rotating three-phase ray source according to the height and the size of the core, and can rotate and scan along the rotating track, and the problem of pipeline winding caused by spin in the scanning process of the core holder can be effectively avoided. The annular ray receiver synchronously receives the transmitted gas, liquid and solid three-phase ray signals of the automatic telescopic rotating three-phase ray source and transmits the signals to the central controller for imaging, and the internal condition of the rock core in the 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 a ring-shaped radiation receiver; 1-3, automatically telescoping and rotating a three-phase ray source; 1-4 sample stages; 1-5 central controllers; a 0-1 connecting line; 1-1-1 shaft pressing liquid inlet; 1-1-2 confining pressure liquid outlets; 1-1-3 surrounding pressure liquid inlet; 1-1-4 displacement air inlets; 1-1-5 bases; 1-1-6 displacement liquid inlets; 1-1-7 displacement liquid outlets; 1-1-8 displacement air outlets; 1-1-9 core rubber sleeves; 1-1-10 confining pressure chambers; 1-1-11 cores; 1-3-1 rotation orbit; 1-3-2 clamping grooves; 2-displacement means; 2-1 displacement liquid storage tank; 2-2 displacing the gas cylinder; 0-2 pipeline; 3-constant temperature and constant pressure circulating device.
Detailed Description
Referring to fig. 1, an in-situ CT on-line scanning displacement experiment system includes a scanning system and an external system. The method comprises the steps of realizing in-situ CT (computed tomography) on-line displacement scanning of a rock core through a scanning system, realizing displacement experiments of the rock core under the condition of constant temperature and constant pressure through an external system, and finally realizing in-situ CT on-line scanning of the rock core under the condition of triaxial by means of high-efficiency cooperation of two large system devices, so as to obtain real-time images of microscopic hole fracture structures of the rock core and evolution of a fluid-solid medium in the full-stress strain process under the condition of triaxial loading.
In a scanning system, the central controller 1-5 is arranged at the left front part 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 at 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 wire 0-1, the automatic telescopic rotating three-phase ray source 1-3 is connected with the clamping groove of the rotating track 1-3-1, the annular ray receiver 1-2 is arranged at the periphery of the rotating track 1-3-1 and is connected with the central controller 1-5 through the connecting wire 0-1-1, the axial pressure liquid inlet 1-1 is arranged at the left upper part of the core holder 1-1, the confining liquid outlet 1-2 is arranged at the left upper part of the core holder 1-1 and is arranged at the lower part of the core holder 1-1 and is arranged at the right part of the core holder 1-1-1, the confining liquid inlet 1-1 is arranged at the left upper part of the core holder 1-1-1 and is displaced at the lower part of the core holder 1-1-1-1 and is displaced at the left upper part of the core holder 1-1-4, the annular ray receiver 1-2 is displaced at the left upper part of the core holder 1-1-1 and is displaced at the left part and is displaced at the left upper part of the core holder 1-1-4 and is displaced at the left side 1-4, 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 in the core holder 1-1, and the core 1-1-11 is arranged in the core rubber sleeve 1-1-9;
in an external system, a displacement device 2 is arranged on the left side of a core holder 1-1, a displacement liquid storage tank 2-1 is arranged on the displacement device 2, a displacement gas cylinder 2-2 is arranged on the left side of the displacement device 2, a 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 a 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 a displacement liquid inlet 1-1-6 and an axial pressure liquid inlet 1-1-1 through a 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 circulating device 3 is respectively connected with the core holder 1-1-1-1 through the pipeline 0-2 and the axial pressure liquid inlet 1-1-1-1.
The specific steps are as follows:
a. determining the temperature and confining pressure required by an experiment according to the stratum 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 core 1-1-11 through the displacement device 2 and the pipeline 0-2 according to a set experimental scheme, applying confining pressure to the core 1-1-11 through the constant temperature and constant pressure circulating device 3 and the pipeline 0-2, and maintaining a required temperature;
c. according to the determined experimental scheme, performing a gas phase single-phase displacement experiment or 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 gas, liquid and solid three-phase ray signals to the central controller 1-5 for imaging;
e. d, after the scanning is finished, continuously injecting fluid, and repeating the steps d-e until a scanning node is preset in the next experimental scheme;
f. and recovering outlet fluid through the displacement liquid outlets 1-1-6 until the experiment is finished.
The foregoing examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the design of the present invention.
Claims (5)
1. An in-situ CT online scanning displacement experiment system is characterized in that: the in-situ CT online scanning displacement experiment system comprises:
the scanning system comprises a 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 core rubber sleeve, a confining pressure chamber, a 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 at the left front of the core holder, the displacement device is arranged at the left side of the core holder, the displacement liquid storage tank is arranged on the displacement device, the displacement gas cylinder is arranged at the left side of the displacement device, the constant temperature and constant pressure circulating device is arranged at the right side of the core holder, the core holder is arranged at the upper part of the sample table and fixedly connected with the sample table through a base, the rotary track is arranged at the periphery of the sample table and internally provided with a clamping groove and connected with the central controller through a 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 at the periphery of the rotary track and connected with the central controller through the connecting wire, the axial pressure liquid inlet is arranged at the left upper part of the core holder, the axial pressure liquid outlet is arranged at the left upper part of the core holder and is arranged at the lower part of the core holder, the axial liquid inlet is fixedly connected with the sample table, the rotary three-phase ray source is arranged at the periphery of the rotary track, the rotary three-phase ray source is arranged at the core inlet and the core inlet, the core holder is arranged at the core inlet and the core inlet is arranged at the right side of the core holder, the displacement liquid storage tank is connected with the displacement liquid inlet and the axial pressure liquid inlet respectively through the pipeline, the displacement gas cylinder is connected with the displacement gas inlet through the pipeline, and the constant temperature and constant pressure circulating device is connected with the confining pressure liquid inlet and the confining pressure liquid outlet respectively through the pipeline.
2. The in situ CT on-line scan displacement experiment system of 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, and is fixedly connected with the sample table through the base and is made of high-strength transparent materials.
3. The in situ CT on-line scan displacement experiment system of claim 1, wherein: the automatic telescopic rotating three-phase ray source is connected with the rotating track through the clamping groove, and the rotating track is connected with the central controller through the connecting wire.
4. The in situ CT on-line scan displacement experiment system of claim 1, wherein: the annular ray receiver is arranged at the periphery of the rotating track and is connected with the central controller through the connecting wire.
5. An in-situ CT on-line scanning displacement experiment system application method, which is characterized in that the in-situ CT on-line scanning displacement experiment system according to any one of claims 1 to 4 is adopted, comprising the following steps:
a. determining the temperature and confining pressure required by the experiment according to the rock core stratum condition, 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 set experimental scheme, applying confining pressure to the core through the constant temperature and constant pressure circulating device and the pipeline, and maintaining the required temperature;
c. according to the determined experimental scheme, performing a gas phase single-phase displacement experiment, a liquid phase single-phase displacement experiment or a gas-liquid phase mixed phase displacement experiment on the rock core through the pipeline;
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 gas, liquid and solid three-phase ray signals to the central controller for imaging;
e. d, 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 experimental scheme;
f. and recycling outlet fluid through the displacement liquid outlet until the experiment is finished.
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