CN103927913A - Deep stratum environment carbon dioxide geological sequestration simulation experiment system - Google Patents
Deep stratum environment carbon dioxide geological sequestration simulation experiment system Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 42
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 41
- 238000004088 simulation Methods 0.000 title claims abstract description 25
- 230000009919 sequestration Effects 0.000 title abstract 4
- 239000007788 liquid Substances 0.000 claims abstract description 136
- 238000002347 injection Methods 0.000 claims abstract description 74
- 239000007924 injection Substances 0.000 claims abstract description 74
- 239000011435 rock Substances 0.000 claims abstract description 46
- 238000012546 transfer Methods 0.000 claims abstract description 39
- 239000000523 sample Substances 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 15
- 238000010168 coupling process Methods 0.000 claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 claims abstract description 15
- 238000002474 experimental method Methods 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims description 64
- 238000003860 storage Methods 0.000 claims description 37
- 230000005540 biological transmission Effects 0.000 claims description 26
- 238000000926 separation method Methods 0.000 claims description 21
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 238000011160 research Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 9
- 238000005755 formation reaction Methods 0.000 description 7
- 238000013508 migration Methods 0.000 description 6
- 230000005012 migration Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention provides a deep stratum environment carbon dioxide geological sequestration simulation experiment system. The deep stratum environment carbon dioxide geological sequestration simulation experiment system comprises a constant temperature box, a sound wave receiver, a temperature, pressure and flow stress coupling core device, a gas-liquid injection device, a gas-liquid discharge device and a confining pressure gas-liquid injection device, wherein the temperature, pressure and flow stress coupling core device is arranged in the constant temperature box. The temperature, pressure and flow stress coupling core device comprises a cylindrical core holding unit, a seal rubber sleeve, an upper stress transfer connector, a lower stress transfer connector, an upper pressure machine force transfer column, a lower pressure machine force transfer column, an upper sound wave transmitting and receiving probe and a lower sound wave transmitting and receiving probe, wherein the two ends of the core holding unit are provided with openings, the seal rubber sleeve is used for wrapping an experimental core in a sealed mode, the upper stress transfer connector, the lower stress transfer connector, the upper pressure machine force transfer column, the lower pressure machine force transfer column, the upper sound wave transmitting and receiving probe and the lower sound wave transmitting and receiving probe are matched with the openings at the two ends of the core holding unit, and the cylindrical body of the core holding unit is provided with a confining pressure gas-liquid injection port. By means of the deep stratum environment carbon dioxide geological sequestration simulation experiment system, a flow experiment of a stratum core sample in an in-situ environment of a deep stratum, a movement mode of carbon dioxide in deep underground rock holes is stimulated really, and accurate experimental data parameters can be obtained in real time.
Description
Technical Field
The invention belongs to the field of research devices of geological carbon dioxide storage technologies, and particularly relates to a geological carbon dioxide storage simulation experiment system for a deep stratum environment.
Background
The environment and energy are two major topics concerned by the sustainable development of the human society and two major factors influencing the development of national economy in China. In recent years, the climate change problem has been listed as a global prime environmental problem, and is increasingly the focus of international social attention. From 7/2009 to 19/12, 192 countries in the world have held a conference on the united nations in copenhagen, and have dealt with countermeasures and measures against climate change. The government of China pays high attention to the climate change problem, and the unit domestic production total carbon dioxide emission rate of China is reduced by 40-45% in 2020 compared with 2005, so that the carbon dioxide emission reduction pressure of China is huge.
At present, a plurality of new methods and new technologies for dealing with global changes are internationally provided, and carbon dioxide geological storage (CGS) is taken as a direct and effective emission reduction means, is an important countermeasure for dealing with climate changes acknowledged by the international society at present, and can meet the increasing energy demand of the world and cannot threaten the global climate. CO 22Geological storage (CO)2GeologicalSequestration), i.e. the generation of CO from stationary point sources (mostly power plants or similar industrial point sources)2By collection, long term storage in relatively closed geological formations, thereby preventing or significantly reducing CO2And artificially discharged to the atmosphere. CO 22The geological storage technology draws high attention of governments and scientists of various countries, developed countries in Europe and America have gone ahead, a large number of feasibility researches, indoor experimental researches and computer simulation researches are carried out, relevant practical engineering demonstration is carried out on the basis, remarkable effects are achieved, and some key technologies are gradually matured.
Early researches and engineering practices show that the geological storage process of carbon dioxide relates to a series of important economic, social, scientific and technical problems and environmental and safety problems. Achieving scientific, efficient, economical, and environmentally friendly geological storage of carbon dioxide requires the joint efforts and cooperation of multidisciplinary sciences and technicians.
The research of China in the field of carbon dioxide geological storage is just started, and the China geological survey bureau implements the first project of carbon dioxide geological storage in China in 2010: evaluation and demonstration engineering of national carbon dioxide geological storage potential. Means to study the spatial migration of carbon dioxide in geological reservoirs include numerical simulation, downhole monitoring, surface earthquakes, indoor experiments, and the like. The indoor simulation experiment is an important method and technical means for researching migration evolution of carbon dioxide in a reservoir and acquiring related parameters. Since geological storage of carbon dioxide is currently in the beginning stage in China, development of relevant experimental devices for scientific research and engineering experiments is urgently needed.
Disclosure of Invention
The invention aims to provide a deep stratum environment carbon dioxide geological storage simulation experiment system, and aims to solve the problem that the existing carbon dioxide geological storage technology research device cannot objectively represent the temperature pressure flow stress coupling under the in-situ environment condition of an experiment core.
The invention is realized in such a way that a deep stratum environment carbon dioxide geological storage simulation experiment system comprises a thermostat, a sound wave receiver, a temperature pressure flow stress coupling rock core device, a gas-liquid injection device, a gas-liquid discharge device and a confining pressure gas-liquid injection device, wherein the temperature pressure flow stress coupling rock core device, the gas-liquid injection device, the gas-liquid discharge device and the confining pressure gas-liquid injection device are arranged in the thermostat; the temperature pressure flow stress coupling rock core device comprises a cylindrical rock core holder with openings at two ends, a sealing rubber sleeve for sealing and wrapping an experimental rock core, upper and lower stress transmission connectors matched with the openings at two ends of the rock core holder, upper and lower force transmission columns of a pressure machine, an upper sound wave transmitting probe, a lower sound wave receiving probe, upper and lower sealing plugs with through holes matched with the upper and lower stress transmission connectors, and a confining pressure gas-liquid injection interface arranged on a cylinder body of the rock core holder; wherein,
the upper sealing plug and the lower sealing plug are respectively in butt joint with two ends of an opening of the core holder and are closed, and a sealing rubber sleeve is arranged in the core holder; one end of the upper stress transfer connector penetrates through the through hole of the upper sealing plug and then props against the rock core in the sealing rubber sleeve, the other end of the upper stress transfer connector props against the force transmission column of the upper press machine, and an upper sound wave emission probe is arranged between the upper stress transfer connector and the force transmission column of the upper press machine; one end of the lower stress transfer connector penetrates through the through hole of the lower sealing plug and then props against a rock core in the sealing rubber sleeve, the other end of the lower stress transfer connector props against a force transmission column of the lower press, and a lower sound wave receiving probe is arranged between the lower stress transfer connector and the force transmission column of the lower press;
the sound wave receiver is respectively connected with the upper sound wave transmitting probe and the lower sound wave receiving probe through data lines;
a gas-liquid discharge interface communicated with the interior of the core holder is arranged in the upper stress transfer connector, and a gas-liquid injection interface communicated with the interior of the core holder is arranged in the lower stress transfer connector; the gas-liquid injection device is connected with the gas-liquid injection interface through a pipeline, and the gas-liquid discharge device is connected with the gas-liquid discharge interface through a pipeline;
an annular sealing cavity is formed among the rock core holder, the sealing rubber sleeve, the upper sealing plug and the lower sealing plug, the annular sealing cavity is communicated with the confining pressure gas-liquid injection interface, and the confining pressure gas-liquid injection interface is connected with the confining pressure gas-liquid injection device through a pipeline.
Preferably, the gas-liquid injection device comprises an injection pressure sensor, a booster pump, a gas storage tank, a pressure regulating valve, a gas inlet valve, a gas outlet valve, a high-pressure gas container A for containing pressurized gas, a container B for containing liquid to be injected in the experimental process, and an injection pump; the air inlet valve, the booster pump, the air storage tank, the pressure regulating valve, the air outlet valve and the gas-liquid injection interface are sequentially connected through pipelines;
the injection pump is respectively connected with the input ends of the container A and the container B through pipelines, and the output ends of the container A and the container B are arranged on a connecting pipeline between the air outlet valve and the gas-liquid injection interface;
the injection pressure sensor is arranged on a connecting pipeline between the air outlet valve and the gas-liquid injection interface, and the injection pressure sensor is positioned between the air outlet valve and the container A.
Preferably, the injection pressure sensors include first, second and third pressure sensors with span gauges of 10MPa, 70MPa, 40MPa, respectively, an F1 valve and an F2 valve; wherein,
the first pressure sensor is connected with the input of F1 valve, the third pressure sensor is connected with the input of F2 valve, the output of F1 valve, the output of second pressure sensor and F2 valve assemble in first branch pipe one end, the first branch pipe other end is connected on the connecting tube between gas outlet valve and the gas-liquid interface of injecing.
Preferably, the deep stratum environment carbon dioxide geological storage simulation experiment system further comprises an upper pressing ring, a lower pressing ring, an upper large cap and a lower large cap; the axes of the upper compression ring and the upper large cap are provided with through holes matched with the upper stress transfer connector, and the axes of the lower compression ring and the lower large cap are provided with through holes matched with the lower stress transfer connector; wherein,
the upper large cap is screwed at one end of the core holder through internal threads, and an upper compression ring in the upper large cap is tightly propped against one end of the upper sealing plug away from the core holder;
the lower big cap is screwed at the other end of the core holder through internal threads, and a lower pressing ring in the lower big cap is tightly propped against one end of the lower sealing plug, which is far away from the core holder.
Preferably, the gas-liquid discharge device comprises F3-F5 valves, a discharge pressure sensor, a back pressure valve, a buffer tank, a back pressure pump, a liquid container, a gas-liquid separator and a flowmeter; the gas-liquid separator is provided with a first gas-liquid separation connecting port, a second gas-liquid separation connecting port and a third gas-liquid separation connecting port; wherein,
an F3 valve is arranged on a connecting pipeline between the first back pressure connecting port and the gas-liquid outlet, and the discharge pressure sensor is connected to a pipeline between the first pipeline connecting port and the F3 valve through a pipeline;
the second back pressure connecting port is connected with the first gas-liquid separation connecting port through a pipeline, the liquid output end of the second gas-liquid separation connecting port is arranged above the liquid container, the third gas-liquid separation connecting port is connected with the gas-liquid discharge port through a pipeline, and an F5 valve, a flowmeter and an F4 valve are sequentially arranged on the pipeline between the third gas-liquid separation connecting port and the gas-liquid discharge port;
the back pressure pump is connected with the third back pressure connecting port through a pipeline, one end of a second branch pipe is connected to a pipeline between the back pressure pump and the third back pressure connecting port, the buffer tank is connected with the back pressure sensor through a pipeline, and the other end of the second branch pipe is connected to a pipeline between the buffer tank and the back pressure sensor.
Preferably, the discharge pressure sensor comprises fourth and fifth pressure sensors with ranges of 40MPa and 10MPa, respectively, and an F6 valve; the fourth pressure sensor is connected with the input end of the F6 valve, the output end of the F6 valve and the fifth pressure sensor are converged on a third branch pipe, and the other end of the third branch pipe is connected to a connecting pipeline of the first back pressure connecting port and the gas-liquid discharge port.
Preferably, the flowmeter comprises a first flowmeter, a second flowmeter and a third flowmeter with the measuring ranges of 10SCCM, 100SCCM and 1000SCCM respectively, and a V1-V3 automatic control valve for automatically switching the flowmeter with the corresponding measuring range to work according to the flow of the pipeline; the third flowmeter is connected with the input end of the V1 automatic control valve, the second flowmeter is connected with the input end of the V2 automatic control valve, the first flowmeter is connected with the input end of the V3 automatic control valve, the output ends of the V1-V3 are converged at one end of a fourth branch pipe, and the other end of the fourth branch pipe is connected to a connecting pipeline between the F5 valve and the F4 valve.
Preferably, the confining pressure gas-liquid injection device comprises a confining pressure pump and a confining pressure sensor, wherein the confining pressure pump is connected with the core holder through a pipeline, and the confining pressure sensor is connected to the pipeline between the confining pressure pump and the core holder.
The invention overcomes the defects of the prior art, provides a geological storage simulation experiment system for carbon dioxide in a deep stratum environment, objectively reconstructs a flow experiment of a stratum rock core sample in an in-situ environment of the deep stratum by combining temperature control, fluid pressure control, stratum stress control, flow measurement and sound wave acquisition based on the current situation of seepage research in the related field, provides a feasible technical guarantee for objectively simulating the migration of the carbon dioxide in the pores of underground rock mass, and provides equipment conditions for acquiring more scientific and objective experiment data and related rock pore fluid flow parameters.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a deep formation environment carbon dioxide geological storage simulation experiment system of the present invention;
FIG. 2 is a schematic diagram of a cross-sectional structure A-A of the temperature pressure flow stress coupled core apparatus of FIG. 1;
FIG. 3 is a schematic view showing the construction of the gas-liquid injection apparatus of FIG. 1;
FIG. 4 is a schematic view showing the structure of the gas-liquid discharge apparatus of FIG. 1;
fig. 5 is a schematic structural view of the confining pressure gas-liquid injection device in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 5, fig. 1 is a schematic structural diagram of an embodiment of a deep formation environment carbon dioxide geological storage simulation experiment system of the present invention; FIG. 2 is a schematic diagram of a cross-sectional structure A-A of the temperature pressure flow stress coupled core apparatus of FIG. 1; FIG. 3 is a schematic view showing the construction of the gas-liquid injection apparatus of FIG. 1; FIG. 4 is a schematic view showing the structure of the gas-liquid discharge apparatus of FIG. 1; fig. 5 is a schematic structural view of the confining pressure gas-liquid injection device in fig. 1.
A geological storage simulation experiment system for carbon dioxide in a deep stratum environment comprises a constant temperature box 1, a sound wave receiver 2, a temperature pressure flow stress coupling rock core device 3, a gas-liquid injection device 4, a gas-liquid discharge device 5 and a confining pressure gas-liquid injection device 6, wherein the temperature pressure flow stress coupling rock core device is arranged in the constant temperature box 1; the temperature pressure flow stress coupling rock core device 3 comprises a cylindrical rock core holder 31 with openings at two ends, a sealing rubber sleeve 321 for sealing and wrapping an experimental rock core, upper and lower stress transmission connectors 331 and 332 matched with the openings at two ends of the rock core holder 31, upper and lower pressure machine force transmission columns 341 and 342, an upper sound wave transmitting probe 351, a lower sound wave receiving probe 352, an upper sealing plug 323 and a lower sealing plug 323, wherein the center of the upper and lower stress transmission connectors 331 and 332 is provided with through holes, and a confining pressure gas-liquid injection interface 36 is arranged on the cylinder body of the rock core holder 31; wherein,
the upper sealing plug 322 and the lower sealing plug 323 are respectively in butt joint with two ends of an opening of the core holder 31 and are closed, and a sealing rubber sleeve 321 is arranged in the core holder 31; one end of the upper stress transfer connector 331 penetrates through the through hole of the upper sealing plug 322 and then abuts against the rock core 7 in the sealing rubber sleeve 321, the other end of the upper stress transfer connector 331 abuts against the upper press force transmission column 341, and an upper sound wave emission probe 351 is arranged between the upper stress transfer connector 331 and the upper press force transmission column 341; one end of the lower stress transfer connector 332 penetrates through the through hole of the lower sealing plug 323 and then props against the rock core 7 in the sealing rubber sleeve 321, the other end of the lower stress transfer connector 332 props against the lower press force transmission column 342, and a lower sound wave receiving probe 352 is arranged between the lower stress transfer connector 332 and the lower press force transmission column 342;
the acoustic receiver 2 is respectively connected with the upper acoustic wave transmitting probe 351 and the lower acoustic wave receiving probe 352 through data lines;
a gas-liquid discharge interface 324 communicated with the interior of the core holder 31 is arranged in the upper stress transfer connector 331, and a gas-liquid injection interface 325 communicated with the interior of the core holder 31 is arranged in the lower stress transfer connector 332; the gas-liquid injection device 4 is connected to the gas-liquid injection port 325 via a pipe, and the gas-liquid discharge device 5 is connected to the gas-liquid discharge port 324 via a pipe;
an annular sealing cavity is formed among the core holder 31, the sealing rubber sleeve 321, the upper sealing plug 322 and the lower sealing plug 323, the annular sealing cavity is communicated with the confining pressure gas-liquid injection interface 36, and the confining pressure gas-liquid injection interface 36 is connected with the confining pressure gas-liquid injection device 6 through a pipeline.
In the embodiment of the invention, in order to ensure the convenience in disassembly and assembly and good sealing performance of the temperature pressure flow stress coupling core device 3, the deep formation environment carbon dioxide geological storage simulation experiment system further comprises an upper pressing ring 326, a lower pressing ring 327, an upper large cap 328, a lower large cap 329; the axial centers of the upper compression ring 326 and the upper large cap 328 are provided with through holes matched with the upper stress transmission connector 331, and the axial centers of the lower compression ring 327 and the lower large cap 329 are provided with through holes matched with the lower stress transmission connector 332; the upper large cap 328 is screwed at one end of the core holder 31 through internal threads, and an upper compression ring 326 in the upper large cap 328 abuts against one end of the upper sealing plug 322 in the direction away from the core holder 31; the lower big cap 329 is screwed on the other end of the core holder 32 through internal threads, and a lower pressing ring 327 in the lower big cap 329 is tightly pressed on one end of the lower sealing plug 323 in the direction away from the core holder 31.
In the embodiment of the present invention, more specifically, the gas-liquid injection device 4 includes an injection pressure sensor 41, a booster pump 42, a gas storage tank 43, a pressure regulating valve 44, a gas inlet valve 45, a gas outlet valve 46, a container a47 for containing pressurized high-pressure gas, a container B48 for containing liquid to be injected during an experiment, and an injection pump 49; the air inlet valve 45, the booster pump 42, the air storage tank 43, the pressure regulating valve 44, the air outlet valve 46 and the gas-liquid injection interface are sequentially connected through pipelines;
the injection pump is respectively connected with the input ends of a container A47 and a container B48 through pipelines, and the output ends of the container A47 and the container B48 are arranged on the connecting pipeline between the gas outlet valve 46 and the gas-liquid injection interface;
the filling pressure sensor 41 is provided on the connecting pipe between the air outlet valve 46 and the gas-liquid filling port, and the filling pressure sensor 41 is located between the air outlet valve 46 and the container a 47.
More specifically, the injection pressure sensor 41 includes first, second and third pressure sensors 411, 412, 413, F1 valve, and F2 valve, with span gauges of 10MPa, 40MPa, 70MPa, respectively; wherein,
the first pressure sensor 411 is connected with the input end of an F1 valve, the third pressure sensor 413 is connected with the input end of an F2 valve, the output end of the F1 valve, the output end of the second pressure sensor 412 and the output end of the F2 valve are converged at one end of a first branch pipe 414, and the other end of the first branch pipe 414 is connected to a connecting pipeline between the air outlet valve 46 and the gas-liquid injection interface.
More specifically, the gas-liquid discharge device 5 includes F3 to F5 valves, a discharge pressure sensor 51, a back pressure sensor 52, a back pressure valve 53, a buffer tank 54, a back pressure pump 55, a liquid container 56, a gas-liquid separator 57, and a flow meter 58; the back pressure valve 53 is provided with a first back pressure connection port, a second back pressure connection port and a third back pressure connection port, the first pipeline connection port and the second pipeline connection port of the back pressure valve 53 are respectively connected with the gas-liquid discharge port through pipelines, and the gas-liquid separator 57 is provided with a first gas-liquid separation connection port, a second gas-liquid separation connection port and a third gas-liquid separation connection port; wherein,
an F3 valve is arranged on a connecting pipeline of the first back pressure connecting port and the gas-liquid outlet, and the discharge pressure sensor 51 is connected to a pipeline between the first pipeline connecting port and the F3 valve through a pipeline;
the second back pressure connecting port is connected with the first gas-liquid separation connecting port through a pipeline, the liquid output end of the second gas-liquid separation connecting port is arranged above the liquid container 56, the third gas-liquid separation connecting port is connected with the gas-liquid discharge port through a pipeline, and an F5 valve, a flowmeter 58 and an F4 valve are sequentially arranged on the pipeline between the third gas-liquid separation connecting port and the gas-liquid discharge port;
the back pressure pump 55 is connected with the third back pressure connection port through a pipeline, one end of a second branch pipe 59 is connected to the pipeline between the back pressure pump 55 and the third back pressure connection port, the buffer tank 54 is connected with the back pressure sensor 52 through a pipeline, and the other end of the second branch pipe 59 is connected to the pipeline between the buffer tank 54 and the back pressure sensor 52.
More specifically, the discharge pressure sensor 51 includes fourth and fifth pressure sensors 511 and 512 having ranges of 40MPa and 10MPa, respectively, and an F6 valve; the fourth pressure sensor 511 is connected with the input end of an F6 valve, the output end of the F6 valve and the fifth pressure sensor 512 are converged on a third branch pipe 513, and the other end of the third branch pipe 513 is connected to a connecting pipeline of the first back pressure connecting port and the gas-liquid discharge port.
More specifically, the flow meter 58 comprises a first flow meter 581, a second flow meter 582 and a third flow meter 583 with the measuring ranges of 10SCCM, 100SCCM and 1000SCCM respectively, and a V1-V3 automatic control valve for automatically switching the flow meters with the corresponding measuring ranges to work according to the flow size of a pipeline; the third flowmeter 583 is connected with an input end of a V1 automatic control valve, the second flowmeter 582 is connected with an input end of a V2 automatic control valve, the first flowmeter 581 is connected with an input end of a V3 automatic control valve, output ends of the V1-V3 are converged at one end of a fourth branch pipe 584, and the other end of the fourth branch pipe 584 is connected to a connecting pipeline between an F5 valve and an F4 valve.
More specifically, the confining pressure gas-liquid injection device 6 comprises a confining pressure pump 61 and a confining pressure sensor 62, wherein the confining pressure pump 61 is connected with the core holder 31 through a pipeline, and the confining pressure sensor 62 is connected to the pipeline between the confining pressure pump 61 and the core holder 31
In the practical application process of the embodiment of the invention, the specific use method comprises the following steps:
(1) putting the prepared core into the sealing rubber sleeve 321, and putting the sealing rubber sleeve 321 filled with the core into the core holder 31;
(2) the protruding ends of the upper and lower sealing plugs 322, 323 are respectively plugged into two ends of the sealing rubber sleeve 321;
(3) the upper and lower pressing rings 326 and 327 are respectively sleeved and pressed at the ends of the upper and lower sealing plugs 322 and 323 far away from the rubber sleeve;
(4) the upper and lower caps 328, 329 with internal threads are mounted on the core holder 31 with mating external threads on both ends. The tightening pressure of the upper and lower caps 328, 329 is transmitted to the upper and lower sealing plugs 322, 323 through the upper and lower tightening rings 326, 327, so that the upper and lower sealing plugs 322, 323 are in sealing contact with the core holder 31. At this time, an annular cavity is formed between the three components of the seal plugs 322, 323, the seal gum 321, and the core holder 31. The cavity is connected with a confining pressure gas-liquid injection device 6 through a confining pressure gas-liquid injection interface 36 arranged on the side wall of the core holder 31. In the experiment, the pressure in the cavity is controlled by controlling the pressure of the confining pressure gas-liquid injection device 6, and the pressure of the cavity is transmitted to the rock core through the sealing rubber sleeve 321, so that the horizontal stress loading of the rock core is realized;
(5) the upper and lower stress transmission connectors 331 and 332 penetrate through the middle openings of the upper and lower large caps 328 and 329 and the middle openings of the upper and lower sealing plugs 322 and 323 and are propped against the upper and lower ends of the rock core in the sealing rubber sleeve 321; the upper and lower stress transfer connectors 331 and 332 transfer the set pressure of the experimental press (universal tester) to the experimental core through the upper and lower force transfer columns 341 and 342, so as to realize axial stress loading of the core;
(6) starting the thermostat 1, controlling the temperature of the rock core chamber, starting the gas-liquid injection device 4, the gas-liquid discharge device 5 and the confining pressure gas-liquid injection device 6, and starting the related experiments.
Based on the current situation of seepage research in the related field, the invention objectively reconstructs the flow experiment of a stratum rock core sample in the in-situ environment of a deep stratum by combining temperature control, fluid pressure control, stratum stress control, flow measurement and sound wave acquisition, and provides an implementation mode for truly simulating the migration of carbon dioxide in the pores of underground rock masses, and in the embodiment of the invention, the specific functions are as follows:
(1) and the precise control and metering in the rock pore fluid displacement process under the specified high-temperature and high-pressure conditions are realized.
(2) The acoustic parameters of the sample during the fluid displacement process can be accurately measured.
(3) The mechanical parameter tests such as deformation of the rock core can be carried out.
(4) The test of the porosity and permeability change of the rock core under different temperature and pressure conditions can be realized.
(5) The gas-liquid discharging device consists of a pressure sensor, a balance and a metering pump, and is used for measuring the liquid permeability and the water saturation of the rock core.
(6) The equipment can continuously work for a long time (30 days) under the set temperature and pressure conditions and has stable performance.
(7) The sample loading and unloading adopts a top loading and unloading mode, is vertical, and oil, gas and water are injected from the lower end.
(8) The computer automatically collects the axial pressure, confining pressure, osmotic pressure, displacement pressure, temperature, flow, saturation and acoustic parameters related to the test system in real time, stores the parameters in a data file, and displays an experiment progress curve in real time, so that experimenters can master the experiment progress and effect in time.
(9) The axial pressure, confining pressure, osmotic pressure, displacement pressure, temperature and acoustic acquisition control instruments and meters related to the test system are integrated on a control console, and all process controls are automatically controlled and processed by a computer. The pressure control system can realize three-axis pressure independent control, and the pressure control units are integrated in one panel.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects:
(1) the invention combines temperature control, fluid pressure control, formation stress control, flow measurement and sound wave acquisition, objectively reconstructs the environmental conditions of temperature, stress and fluid pressure coupling of the deep formation where the formation core sample is located, and provides an implementation mode for more objectively simulating the migration of carbon dioxide in the pores of the underground rock mass.
(2) The acoustic wave transmitting and receiving probes are arranged in the upper stress transmission joint and the lower stress transmission joint, so that the acoustic parameters of the rock core in the experiment process can be monitored in real time in different stages, and important information and data can be provided for fluid displacement experiments and migration of carbon dioxide fluid in the rock core through interpretation of acoustic wave signals.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A geological storage simulation experiment system for carbon dioxide in a deep stratum environment is characterized by comprising a thermostat, a sound wave receiver, a temperature pressure flow stress coupling rock core device, a gas-liquid injection device, a gas-liquid discharge device and a confining pressure gas-liquid injection device, wherein the temperature pressure flow stress coupling rock core device, the gas-liquid injection device, the gas-liquid discharge device and the confining pressure gas-liquid injection device are arranged in the thermostat; the temperature pressure flow stress coupling rock core device comprises a cylindrical rock core holder with openings at two ends, a sealing rubber sleeve for sealing and wrapping an experimental rock core, upper and lower stress transmission connectors matched with the openings at two ends of the rock core holder, upper and lower force transmission columns of a pressure machine, an upper sound wave transmitting probe, a lower sound wave receiving probe, upper and lower sealing plugs with through holes matched with the upper and lower stress transmission connectors, and a confining pressure gas-liquid injection interface arranged on a cylinder body of the rock core holder; wherein,
the upper sealing plug and the lower sealing plug are respectively in butt joint with two ends of an opening of the core holder and are closed, and a sealing rubber sleeve is arranged in the core holder; one end of the upper stress transfer connector penetrates through the through hole of the upper sealing plug and then props against the rock core in the sealing rubber sleeve, the other end of the upper stress transfer connector props against the force transmission column of the upper press machine, and an upper sound wave emission probe is arranged between the upper stress transfer connector and the force transmission column of the upper press machine; one end of the lower stress transfer connector penetrates through the through hole of the lower sealing plug and then props against a rock core in the sealing rubber sleeve, the other end of the lower stress transfer connector props against a force transmission column of the lower press, and a lower sound wave receiving probe is arranged between the lower stress transfer connector and the force transmission column of the lower press;
the sound wave receiver is respectively connected with the upper sound wave transmitting probe and the lower sound wave receiving probe through data lines;
a gas-liquid discharge interface communicated with the interior of the core holder is arranged in the upper stress transfer connector, and a gas-liquid injection interface communicated with the interior of the core holder is arranged in the lower stress transfer connector; the gas-liquid injection device is connected with the gas-liquid injection interface through a pipeline, and the gas-liquid discharge device is connected with the gas-liquid discharge interface through a pipeline;
an annular sealing cavity is formed among the rock core holder, the sealing rubber sleeve, the upper sealing plug and the lower sealing plug, the annular sealing cavity is communicated with the confining pressure gas-liquid injection interface, and the confining pressure gas-liquid injection interface is connected with the confining pressure gas-liquid injection device through a pipeline.
2. The deep formation environment carbon dioxide geological storage simulation experiment system of claim 1, characterized in that the deep formation environment carbon dioxide geological storage simulation experiment system further comprises an upper compression ring, a lower compression ring, an upper cap and a lower cap; the axes of the upper compression ring and the upper large cap are provided with through holes matched with the upper stress transfer connector, and the axes of the lower compression ring and the lower large cap are provided with through holes matched with the lower stress transfer connector; wherein,
the upper large cap is screwed at one end of the core holder through internal threads, and an upper compression ring in the upper large cap is tightly propped against one end of the upper sealing plug away from the core holder;
the lower big cap is screwed at the other end of the core holder through internal threads, and a lower pressing ring in the lower big cap is tightly propped against one end of the lower sealing plug, which is far away from the core holder.
3. The deep formation environment carbon dioxide geological storage simulation experiment system of claim 2, wherein the gas-liquid injection device comprises an injection pressure sensor, a booster pump, a gas storage tank, a pressure regulating valve, a gas inlet valve, a gas outlet valve, a pressurized high-pressure gas container A for containing pressurized high-pressure gas, a container B for containing liquid to be injected in the experiment process, and an injection pump; the air inlet valve, the booster pump, the air storage tank, the pressure regulating valve, the air outlet valve and the gas-liquid injection interface are sequentially connected through pipelines;
the injection pump is respectively connected with the input ends of the container A and the container B through pipelines, and the output ends of the container A and the container B are arranged on a connecting pipeline between the air outlet valve and the gas-liquid injection interface;
the injection pressure sensor is arranged on a connecting pipeline between the air outlet valve and the gas-liquid injection interface, and the injection pressure sensor is positioned between the air outlet valve and the container A.
4. The deep formation environment carbon dioxide geological storage simulation experiment system of claim 3, wherein the injection pressure sensors comprise first, second and third pressure sensors with range specifications of 10MPa, 70MPa, 40MPa, respectively, an F1 valve and an F2 valve; wherein,
the first pressure sensor is connected with the input of F1 valve, the third pressure sensor is connected with the input of F2 valve, the output of F1 valve, the output of second pressure sensor and F2 valve assemble in first branch pipe one end, the first branch pipe other end is connected on the connecting tube between gas outlet valve and the gas-liquid interface of injecing.
5. The deep formation environment carbon dioxide geological storage simulation experiment system of claim 4, wherein the gas-liquid discharge device comprises an F3-F5 valve, a discharge pressure sensor, a back pressure valve, a buffer tank, a back pressure pump, a liquid container, a gas-liquid separator and a flowmeter; the gas-liquid separator is provided with a first gas-liquid separation connecting port, a second gas-liquid separation connecting port and a third gas-liquid separation connecting port; wherein,
an F3 valve is arranged on a connecting pipeline between the first back pressure connecting port and the gas-liquid outlet, and the discharge pressure sensor is connected to a pipeline between the first pipeline connecting port and the F3 valve through a pipeline;
the second back pressure connecting port is connected with the first gas-liquid separation connecting port through a pipeline, the liquid output end of the second gas-liquid separation connecting port is arranged above the liquid container, the third gas-liquid separation connecting port is connected with the gas-liquid discharge port through a pipeline, and an F5 valve, a flowmeter and an F4 valve are sequentially arranged on the pipeline between the third gas-liquid separation connecting port and the gas-liquid discharge port;
the back pressure pump is connected with the third back pressure connecting port through a pipeline, one end of a second branch pipe is connected to a pipeline between the back pressure pump and the third back pressure connecting port, the buffer tank is connected with the back pressure sensor through a pipeline, and the other end of the second branch pipe is connected to a pipeline between the buffer tank and the back pressure sensor.
6. The deep formation environment carbon dioxide geological storage simulation experiment system of claim 5, wherein the discharge pressure sensor comprises a fourth pressure sensor, a fifth pressure sensor and an F6 valve with ranges of 40MPa and 10MPa respectively; the fourth pressure sensor is connected with the input end of the F6 valve, the output end of the F6 valve and the fifth pressure sensor are converged on a third branch pipe, and the other end of the third branch pipe is connected to a connecting pipeline of the first back pressure connecting port and the gas-liquid discharge port.
7. The deep formation environment carbon dioxide geological storage simulation experiment system of claim 6, wherein the flow meters comprise a first flow meter, a second flow meter and a third flow meter with the measuring ranges of 10SCCM, 100SCCM and 1000SCCM respectively, and a V1-V3 automatic control valve for automatically switching the flow meters with the corresponding measuring ranges to work according to the flow size of the pipeline; the third flowmeter is connected with the input end of the V1 automatic control valve, the second flowmeter is connected with the input end of the V2 automatic control valve, the first flowmeter is connected with the input end of the V3 automatic control valve, the output ends of the V1-V3 are converged at one end of a fourth branch pipe, and the other end of the fourth branch pipe is connected to a connecting pipeline between the F5 valve and the F4 valve.
8. The deep formation environment carbon dioxide geological storage simulation experiment system of claim 7, wherein the confining pressure gas-liquid injection device comprises a confining pressure pump and a confining pressure sensor, wherein the confining pressure pump is connected with the core holder through a pipeline, and the confining pressure sensor is connected to a pipeline between the confining pressure pump and the core holder.
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