CN114859010A - Monitoring gas reservoir rock CO injection 2 In-process CO 2 Dynamic device and method - Google Patents
Monitoring gas reservoir rock CO injection 2 In-process CO 2 Dynamic device and method Download PDFInfo
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- CN114859010A CN114859010A CN202210293457.0A CN202210293457A CN114859010A CN 114859010 A CN114859010 A CN 114859010A CN 202210293457 A CN202210293457 A CN 202210293457A CN 114859010 A CN114859010 A CN 114859010A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 151
- 239000010453 quartz Substances 0.000 claims abstract description 109
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 54
- 239000006004 Quartz sand Substances 0.000 claims abstract description 42
- 238000005070 sampling Methods 0.000 claims abstract description 30
- 239000000523 sample Substances 0.000 claims abstract description 27
- 239000003822 epoxy resin Substances 0.000 claims abstract description 23
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 23
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- 239000012267 brine Substances 0.000 claims abstract description 14
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 13
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 13
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Abstract
The invention discloses a method for monitoring CO injection of gas reservoir rock 2 In-process CO 2 A dynamic device and a dynamic method are involved, which relate to the technical field of oil and gas field development engineering. The device comprises a quartz sandstone plate model, a fluid injection system, a confining pressure applying system, a back pressure system, a sampling system, a vacuum pump and a data acquisition and processing system; the quartz sand rock plate model comprises a quartz sand rock plate, an epoxy resin layer, a hydraulic oil cavity and a pressure-resistant shell from inside to outside, wherein a PH probe, an injection pipeline and an extraction pipeline are pre-buried in the quartz sand rock plate. The invention adopts a PH probe to monitor in real time that CO is dissolved in the pores of the porous medium at different positions in the model 2 The pH of the brine was measured and the CO was calculated there 2 Relative concentration of (a), real-time plotting CO in the large-scale porous medium by a data analysis system 2 The distribution dynamic diagram can better simulate and monitor CO injection 2 In-process CO 2 Dynamic law of distribution, injecting CO into gas reservoir rock 2 Enhanced recovery and CO 2 Research on the mechanism of sequestration provides an effective means.
Description
Technical Field
The invention relates to the technical field of oil and gas field development engineering, in particular to a method for monitoring CO injection of gas reservoir rock 2 In-process CO 2 A dynamic device and method.
Background
The continuous reduction of pressure in the development process of a gas reservoir causes reservoir stress sensitivity and bottom water invasion, so that the permeability of the reservoir is reduced, the water saturation of the reservoir is increased, and the productivity of a gas well and the ultimate recovery ratio of the reservoir are seriously affected. CO injection into gas reservoirs during exhaustion development 2 Can effectively maintain or even improve reservoir pressure, supplement gas reservoir energy, delay invasion of bottom water, improve gas well productivity and gas reservoir ultimate recovery ratio (CO) 2 -EGR). Due to CO 2 And CH 4 Density difference of (2), injected CO 2 Finally, the CO is accumulated at the bottom of the gas reservoir to form CO 2 Air cushion layer, CO 2 And CH 4 Can be stably distributed in the gas reservoir. Gas reservoirs as excellent geological traps, gas reservoirs injected with CO 2 Improves the natural gas recovery ratio and simultaneously realizes CO 2 Is safely and efficiently buried.
CO 2 And CH 4 Seepage rule of mixed gas in reservoir and CO 2 The fluctuation of (A) is to determine the CO content of the gas reservoir 2 -key factors of EGR effectiveness. However, CO is compared to gas-liquid seepage in the reservoir 2 Is difficult to monitor, especially in studying CO 2 Lack of accurate real-time monitoring of CO in physical simulation of EGR mechanisms 2 The dynamic means cannot realize the CO in the porous medium 2 The seepage and distribution rules are directly researched. In the prior part of experiments, the gas in the porous medium is sampled and the components of the gas are analyzed to monitor CO in the mixed gas 2 Concentration of (2), determination of CO 2 The distribution of (2) is not convincing because the gas seepage and distribution state are damaged in the sampling process and real-time monitoring cannot be realized.
Disclosure of Invention
In view of this, the invention discloses monitoring gas reservoir rock CO injection 2 In-process CO 2 A dynamic fluctuation device and method adopts a PH probe to monitor CO dissolved in pores of porous media at different positions in a model in real time 2 The pH of the brine was measured and the CO was calculated there 2 Relative concentration of (a), real-time plotting CO in the large-scale porous medium by a data analysis system 2 Distribution dynamic diagram of CO injection for researching reservoir stratum of gas reservoir 2 In-process CO 2 Seepage and sweptThe dynamic simulation experiment method provides an effective and reliable simulation experiment means.
The invention aims to provide a method for monitoring CO injection of gas reservoir rock 2 In-process CO 2 The dynamic device comprises a quartz sandstone plate model, a fluid injection system, a confining pressure applying system, a back pressure system, a sampling system, a vacuum pump and a data acquisition and processing system.
The quartz sand rock plate model is composed of a quartz sand rock plate, an epoxy resin layer, a hydraulic oil cavity and a pressure-resistant shell from inside to outside, and a PH probe, an injection pipeline and an extraction pipeline are pre-buried in the quartz sand rock plate.
The fluid injection system comprises a high-pressure container and an injection pump, wherein the high-pressure container is connected to the injection pipeline of the quartz sandstone plate model and is used for storing saline water and CO for simulating formation water 2 And CH 4 And maintaining a certain fluid pressure; the injection pump is connected with the high-pressure container and used for providing displacement pressure to inject fluid in the high-pressure container into the quartz sandstone board through the injection pipeline.
And the confining pressure applying system comprises a confining pressure pump and hydraulic oil, the hydraulic oil is connected with the confining pressure pump and a hydraulic oil cavity in the quartz sandstone board model, and the hydraulic oil cavity in the quartz sandstone board model is filled with the hydraulic oil under the action of the confining pressure pump to maintain the confining pressure of the quartz sandstone board.
The back pressure system comprises a back pressure pump and a back pressure valve, the back pressure valve is connected to the production pipeline of the quartz sandstone board model, the back pressure pump is connected with the back pressure valve, the back pressure pump and the back pressure valve are combined to keep the pressure of the production end, and the flow pressure at the bottom of the well is simulated.
The sampling system comprises a gas-liquid separator, a sampling bag and a gas flowmeter; the gas-liquid separator is connected to the back pressure valve and is used for separating gas and liquid; the sampling bag is connected with the gas-liquid separator and is used for sampling the gas separated by the gas-liquid separator to perform component detection; the gas flowmeter is arranged on a connecting pipeline of the gas-liquid separator and the sampling bag and used for metering the volume of gas separated by the gas-liquid separator.
The vacuum pump is connected to the extraction pipeline of the quartz sand rock plate model and used for vacuumizing the quartz sand rock plate to saturate brine.
And valves and pressure gauges are arranged on connecting pipelines of the high-pressure container, the hydraulic oil, the vacuum pump, the back-pressure valve and the quartz sandstone board model.
The data acquisition and processing system comprises a PH probe, a pressure gauge, a gas flowmeter and a computer, wherein the PH probe is connected with the computer through a data transmission line.
Preferably, the length, width and height of the quartz sandstone plate are 25 × 10cm, and the size of the quartz sandstone plate after being coated with the epoxy resin is 29 × 14 cm.
Preferably, 25 PH probes and matched sealing screws thereof are uniformly distributed on the bottom surface and the top surface of the quartz sandstone board respectively, and the injection pipeline and the extraction pipeline are buried at two sides of the quartz sandstone board respectively.
Preferably, the pressure-resistant shell is designed and manufactured according to the size of the quartz sandstone plate and the positions of the injection pipeline and the extraction pipeline, a PH probe line interface is reserved on the pressure-resistant shell, and a hydraulic oil injection port communicated with the hydraulic oil cavity is arranged on the upper left side and the lower right side of the pressure-resistant shell respectively.
The invention also discloses a method for monitoring CO injection of gas reservoir rock by using the device 2 In-process CO 2 The dynamic method comprises the following steps:
the method comprises the following steps: the prefabricated quartz sandstone board model, the connecting device and all the valves are in a closed state.
Step two: and starting a vacuum pump and a corresponding valve to vacuumize the saturated salt water for the quartz sandstone plate, and closing the vacuum pump and the corresponding valve after the preset time is reached.
Step three: and starting a back pressure pump, setting to a preset pressure, opening an injection pump, a valve at the inlet end of the quartz sand rock plate model and valves at two ends of a saline container, injecting saline into the quartz sand rock plate, synchronously starting a confining pressure pump and a valve corresponding to hydraulic oil to inject the hydraulic oil into a hydraulic oil cavity of the quartz sand rock plate model, and maintaining the confining pressure of the quartz sand rock plate, wherein the pressure of the confining pressure pump is higher than the pressure of the saline.
Step four: closing valves at two ends of the brine container and opening CH 4 Two-end valve of container, and CH is pumped by injection pump 4 Injection ofIn the quartz sandstone plate, until the outlet end does not produce brine any more, the quartz sandstone plate is saturated CH under certain confining pressure until the saturation degree of the bound water is reached 4 In the state (2), the pore pressure of the quartz sandstone plate reaches a certain value.
Step five: close CH 4 Valve at both ends of the container and open CO 2 Valves at both ends of the vessel for feeding CO by means of an injection pump 2 And injecting the gas into the quartz sandstone plate, continuously sampling and numbering the produced gas by using a sampling bag, and recording the sampling time.
Step six: in the experimental process, interpolation calculation is carried out according to PH values obtained by PH probes at different positions and different times in the quartz sandstone board model to obtain the distribution of PH in the quartz sandstone board model, and the distribution of PH is converted into CO 2 Distribution of concentration, plotting CO 2 And (4) a concentration distribution dynamic graph.
Step seven: and closing the injection pump, the back pressure pump, the confining pressure pump and all valves to finish the experiment.
Preferably, in the first step, the method for manufacturing the quartz sandstone plate model comprises the following steps:
s1, mixing quartz sand and a bonding agent according to experimental design size, pouring the mixture into a grinding tool for forming, pre-embedding an injection pipeline, an extraction pipeline and a PH probe with a sealing screw into a quartz sandstone plate, compacting and drying the quartz sandstone plate, and then carrying out fine processing to enable the quartz sandstone plate to reach the design size.
S2, placing the quartz sandstone board in an epoxy resin pool, enabling the quartz sandstone board to wrap an epoxy resin sealing layer with the thickness not less than 2cm, compacting, drying and polishing the quartz sandstone board into a regular shape.
And S3, placing the quartz sandstone board wrapped with the epoxy resin in a water pool, and injecting air into the quartz sandstone board to test the airtightness of the quartz sandstone board.
And S4, placing the tested quartz sandstone board into a prefabricated pressure-resistant shell, and sealing.
And S5, injecting hydraulic oil into the pressure-resistant shell through a hydraulic oil injection port on the pressure-resistant shell, and forming a hydraulic oil cavity between the quartz sandstone plate wrapped with the epoxy resin and the pressure-resistant shell so as to apply confining pressure on the quartz sandstone plate.
Preferably, in the second step, the vacuum pump is closed after the quartz sandstone plate model is vacuumized for 12 hours.
Compared with the prior art, the method for monitoring CO injection of gas reservoir rock disclosed by the invention 2 In-process CO 2 The advantages of the dynamic device and method are:
(1) the invention adopts a PH probe to monitor the porous medium pores at different positions in the model in real time and dissolves CO 2 The pH of the brine was measured and the CO was calculated there 2 Relative concentration of (a), real-time plotting CO in the large-scale porous medium by a data analysis system 2 The distribution dynamic diagram can better simulate and monitor CO injection 2 In-process CO 2 Dynamic law of distribution, injecting CO into gas reservoir rock 2 Enhanced recovery and CO 2 Research on the mechanism of sequestration provides an effective means.
(2) The invention adopts the design of filling hydraulic oil into the pressure-resistant shell and specially manufacturing the sealing screw, and overcomes the key problems that the physical model of the gas reservoir has large size and strong pressure resistance and sealing property which can not be considered at the same time.
Drawings
For a clearer explanation of the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a diagram illustrating CO injection monitoring of gas reservoir rock 2 In-process CO 2 The structure of a dynamic device.
FIG. 2 is a view showing an internal structure of a quartz sandstone plate model.
Fig. 3 is a top view of a quartz sandstone plate model.
In the figure: 1-quartz sandstone slab model; 2-an injection pump; 3-a high pressure vessel; 4-a valve; 5-a pressure gauge; 6-hydraulic oil; 7-enclosing and pressing pump; 8-a back pressure valve; 9-a back pressure pump; 10-a gas-liquid separator; 11-a gas flow meter; 12-a sampling bag; 13-a vacuum pump; 14-a data transmission line; 15-a computer; 16-hydraulic oil injection port; 17-a pressure-resistant casing; 18-an injection line; 19-an epoxy resin layer; 20-a hydraulic oil chamber; 21-sealing screw; 22-PH probe; 23-quartz sandstone plates; 24-a production line; 25-support columns.
Detailed Description
The following provides a brief description of embodiments of the present invention with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any inventive work belong to the protection scope of the present invention.
Fig. 1-3 illustrate a preferred embodiment of the present invention, which is parsed in detail.
A method for monitoring CO injection of gas reservoir rock as shown in figure 1 2 In-process CO 2 The device comprises a quartz sandstone plate model 1, a fluid injection system, a confining pressure applying system, a back pressure system, a sampling system, a vacuum pump 13 and a data acquisition and processing system.
As shown in fig. 2 and 3, the quartz sand rock plate model 1 includes, from inside to outside, a quartz sand rock plate 23, an epoxy resin layer 19, a hydraulic oil chamber 20, and a pressure-resistant casing 17. Wherein the quartz sandstone plate 23 is prepared by mixing resin and 100-mesh quartz sand, the ratio of the resin to the quartz sand is 30:100, and the finally formed quartz sandstone plate 23 has the permeability of 10mD and the porosity of 12%. A PH probe 22, an injection pipeline 18 and a production pipeline 24 are pre-buried in the quartz sandstone board 23. PH probes 22 are buried on the top surface and the bottom surface of a quartz sandstone plate 23 through special sealing screws 21, 25 PH probes are uniformly distributed on each surface, and an injection pipeline 18 and a production pipeline 24 are buried on two sides of the quartz sandstone plate 23 respectively. The epoxy resin layer 19 is wrapped outside the quartz sandstone plate 23, and the thickness is 2 cm. The pressure casing 17 is designed and manufactured according to the positions of the injection pipeline 18 and the extraction pipeline 24 of the quartz sandstone board 23, and comprises a body and a cover, wherein a PH probe 22 line interface is reserved on the pressure casing 17, and hydraulic oil injection ports 16 are further arranged on the upper left side and the lower right side. After the quartz sandstone plate 23 wrapped with epoxy resin is placed in the pressure-resistant shell 17, the interface is sealed by a special sealing screw 21, a high-pressure sealing rubber strip and a sealing ring, so that the sealing property is ensured. The cavity between the epoxy resin layer 19 and the pressure-resistant shell 17 is a hydraulic oil cavity 20, and hydraulic oil 6 is injected into the hydraulic oil cavity 20 through a hydraulic oil injection port 16 on the pressure-resistant shell 17, namely confining pressure is applied to a quartz sandstone plate 23. The pressure casing 17 is also provided with support columns 25 at the bottom to prevent the bottom surface of the quartz sand plate 23 from sticking to the bottom of the casing, so that the hydraulic oil 6 can fully surround the quartz sand plate 23.
The fluid injection system comprises a high-pressure container 3 and an injection pump 2, wherein the high-pressure container 3 is connected to an injection pipeline 18 of the quartz sandstone plate model 1 and is used for storing saline water and CO for simulating formation water 2 And CH 4 And a certain fluid pressure is maintained. The injection pump 2 is connected to the high-pressure vessel 3 for providing a displacement pressure to inject the fluid in the high-pressure vessel 3 into the quartz sandstone plate 23 through the injection line 18.
The confining pressure applying system comprises a confining pressure pump 7 and hydraulic oil 6, the hydraulic oil 6 is connected with the confining pressure pump 7 and a hydraulic oil cavity 20 in the quartz sandstone board model 1, the hydraulic oil 6 is injected into the hydraulic oil cavity 20 in the quartz sandstone board model 1 under the action of the confining pressure pump 7, and the confining pressure of the quartz sandstone board 23 is maintained.
The back pressure system comprises a back pressure pump 9 and a back pressure valve 8, the back pressure valve 8 is connected to a production pipeline 24 of the quartz sandstone board model 1, the back pressure pump 9 is connected with the back pressure valve 8, and the back pressure pump and the back pressure valve 8 are combined to keep the pressure of a production end and simulate the bottom hole flowing pressure.
The sampling system comprises a gas-liquid separator 10, a sampling bag 12 and a gas flow meter 11. The gas-liquid separator 10 is connected to the back pressure valve 8 and is used for separating gas and liquid; the sampling bag 12 is connected with the gas-liquid separator 10 and is used for sampling the gas separated by the gas-liquid separator 10 and detecting the components of the gas; the gas flow meter 11 is disposed on a connection line between the gas-liquid separator 10 and the sampling bag 12, and measures the volume of the gas separated by the gas-liquid separator 10.
The vacuum pump 13 is connected to the extraction pipeline 24 of the quartz sandstone board model 1 and is used for vacuumizing the quartz sandstone board 23 to saturate brine.
And valves 4 and pressure gauges 5 are arranged on connecting pipelines of the high-pressure container 3, the hydraulic oil 6, the vacuum pump 13, the back-pressure valve 8 and the quartz sandstone board model 1.
The data acquisition and processing system comprises a PH probe 22, a pressure gauge 5, a gas flow meter 11 and a computer 15, wherein the PH probe 22 is connected with the computer 15 through a data transmission line 14.
The invention also discloses a method for monitoring CO injection of gas reservoir rock by using the device 2 In-process CO 2 The dynamic method comprises the following steps:
the method comprises the following steps: the quartz sandstone plate model 1 is prefabricated and connected with the device, so that all the valves 4 are in a closed state. The manufacturing method of the quartz sandstone plate model 1 comprises the following steps:
s1, mixing resin and 100-mesh quartz sand according to the ratio of 30:100 according to the experimental design size, pouring the mixture into a grinding tool for forming, pre-embedding an injection pipeline 18, a production pipeline 24 and a PH probe 22 with a sealing screw 21 in a quartz sand rock plate 23, pressing the quartz sand rock plate 23 at 80 ℃ and 20MPa for 12 hours, and performing fine processing after air-drying and forming for 24 hours to enable the length, width and height of the quartz sand rock plate to be 25 x 10 cm.
S2, placing the quartz sand rock plate 23 in an epoxy resin pool, enabling the quartz sand rock plate 23 to wrap an epoxy resin sealing layer with the thickness of 4cm, compacting, drying and polishing the quartz sand rock plate 23 into a regular shape, wherein the size of the quartz sand rock plate 23 wrapped with epoxy resin is 29 x 14 cm.
And S3, placing the quartz sand rock plate 23 wrapped with the epoxy resin into a water pool, and injecting air into the quartz sand rock plate 23 to test the airtightness of the quartz sand rock plate.
And S4, placing the tested quartz sandstone plate 23 into a prefabricated pressure-resistant shell 17, and sealing the interface by using a special sealing screw 21, a high-pressure sealing rubber strip and a sealing ring.
S5, injecting hydraulic oil 6 into the pressure shell 17 through a hydraulic oil injection port 16 on the pressure shell 17, and forming a hydraulic oil cavity 20 between the quartz sand rock plate 23 wrapped with epoxy resin and the pressure shell 17 so as to apply confining pressure on the quartz sand rock plate 23.
Step two: and starting the vacuum pump 13 and the corresponding valve 4 to vacuumize the saturated salt water for the quartz sandstone plate 23, and closing the vacuum pump 13 and the valve 4 after vacuumizing for 12 hours.
Step three: and (3) starting a back pressure pump 9, setting to a preset pressure, opening an injection pump 2, an inlet end valve 4 of the quartz sandstone plate model 1 and valves 4 at two ends of a saline container, injecting saline into the quartz sandstone plate 23, and synchronously starting a confining pressure pump 7 and a hydraulic oil 6 corresponding valve 4 to inject the hydraulic oil 6 into a hydraulic oil cavity 20 of the quartz sandstone plate model 1, so as to maintain the confining pressure of the quartz sandstone plate 23. The injection pressure of the brine is 1.2MPa, and the pressure of the confining pressure pump 7 is slightly higher than the pressure of the brine.
Step four: closing valves 4 at two ends of the brine container and opening CH 4 Valves 4 at both ends of the vessel, and CH is pumped by the injection pump 2 4 Injecting the mixture into the quartz sandstone plate 23 until the salt water is no longer produced through the observation of the gas-liquid separator 10, and realizing that the quartz sandstone plate 23 is saturated CH under the saturation of the bound water under certain confining pressure 4 In the state (2), the pore pressure of the quartz sandstone plate 23 reaches a certain value.
Step five: close CH 4 Valve 4 at both ends of the vessel and open CO 2 Valves 4 at both ends of the vessel for feeding CO through the injection pump 2 2 And injecting the gas into the quartz sandstone plate 23, continuously sampling and numbering the produced gas by using the sampling bag 12 in the process, and recording the sampling time.
Step six: in the experiment process, interpolation calculation is carried out according to the PH values obtained by the PH probes 22 at different positions and different times in the quartz sandstone board model 1 to obtain the PH distribution in the quartz sandstone board model 1, and the PH distribution is converted into CO 2 Distribution of concentration, plotting CO 2 And (4) a concentration distribution dynamic graph. Simultaneously marking pressure data, gas production accumulated volume and gas component data of injection and production ends of the quartz sandstone plate model 1 in different distribution states, and comprehensively analyzing CO 2 The concentration profile provides the basis for the data.
Step seven: the injection pump 2, the back-pressure pump 9, the confining pressure pump 7 and all the valves 4 are closed, and the experiment is ended.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. Monitoring CO injection of gas reservoir rock 2 In-process CO 2 The device for fluctuating dynamics is characterized by comprising a quartz sandstone plate model (1), a fluid injection system, a confining pressure applying system, a back pressure system, a sampling system, a vacuum pump (13) and a data acquisition and processing system;
the quartz sandstone board model (1) is composed of a quartz sandstone board (23), an epoxy resin layer (19), a hydraulic oil chamber (20) and a pressure-resistant shell (17) from inside to outside, and a PH probe (22), an injection pipeline (18) and a production pipeline (24) are pre-buried in the quartz sandstone board (23);
the fluid injection system comprises a high-pressure container (3) and an injection pump (2), wherein the high-pressure container (3) is connected to an injection pipeline (18) of the quartz sandstone plate model (1) and is used for storing saline water and CO simulating formation water 2 And CH 4 And maintaining a certain fluid pressure; the injection pump (2) is connected with the high-pressure container (3) and is used for providing displacement pressure to inject fluid in the high-pressure container (3) into the quartz sandstone plate (23) through the injection pipeline (18);
the confining pressure applying system comprises a confining pressure pump (7) and hydraulic oil (6), the hydraulic oil (6) is connected with the confining pressure pump (7) and a hydraulic oil cavity (20) in the quartz sandstone board model (1), and the hydraulic oil (6) is injected into the hydraulic oil cavity (20) in the quartz sandstone board model (1) under the action of the confining pressure pump (7) to maintain the confining pressure of the quartz sandstone board (23);
the back pressure system comprises a back pressure pump (9) and a back pressure valve (8), the back pressure valve (8) is connected to a production pipeline (24) of the quartz sandstone board model (1), the back pressure pump (9) is connected with the back pressure valve (8), and the back pressure pump and the back pressure valve (8) are combined to maintain the pressure of a production end and simulate the flow pressure at the bottom of the well;
the sampling system comprises a gas-liquid separator (10), a sampling bag (12) and a gas flowmeter (11); the gas-liquid separator (10) is connected to the back pressure valve (8) and is used for separating gas and liquid; the sampling bag (12) is connected with the gas-liquid separator (10) and is used for sampling the gas separated by the gas-liquid separator (10) and detecting the components of the gas; the gas flowmeter (11) is arranged on a connecting pipeline of the gas-liquid separator (10) and the sampling bag (12) and is used for metering the volume of gas separated by the gas-liquid separator (10);
the vacuum pump (13) is connected to the extraction pipeline (24) of the quartz sandstone plate model (1) and is used for vacuumizing the quartz sandstone plate (23) to saturate brine;
valves (4) and pressure gauges (5) are arranged on connecting pipelines of the high-pressure container (3), the hydraulic oil (6), the vacuum pump (13), the back pressure valve (8) and the quartz sandstone plate model (1);
the data acquisition and processing system comprises a PH probe (22), a pressure gauge (5), a gas flowmeter (11) and a computer (15), wherein the PH probe (22) is connected with the computer (15) through a data transmission line (14).
2. Monitoring gas reservoir rock CO injection as claimed in claim 1 2 In-process CO 2 The device is characterized in that the quartz sand rock plate (23) has a length, a width and a height of 25 x 10cm and a size of 29 x 14cm after being coated with epoxy resin.
3. Monitoring gas reservoir rock CO injection as claimed in claim 1 2 In-process CO 2 The device for fluctuating dynamics is characterized in that 25 PH probes (22) and matched sealing screws (21) thereof are respectively and uniformly distributed on the bottom surface and the top surface of the quartz sandstone plate (23), and an injection pipeline (18) and an extraction pipeline (24) are respectively buried at two sides of the quartz sandstone plate (23).
4. Monitoring gas reservoir rock CO injection as claimed in claim 1 2 In-process CO 2 The wave and dynamic device is characterized in that the pressure-resistant shell (17) is designed and manufactured according to the size of a quartz sandstone plate (23) and the positions of an injection pipeline (18) and a production pipeline (24), a PH probe (22) line interface is reserved on the pressure-resistant shell, and a hydraulic oil injection port (16) is respectively arranged at the upper left part and the lower right part of the pressure-resistant shell (17) and communicated with a hydraulic oil chamber (20).
5. A kind ofMonitoring gas reservoir rock CO injection using the device of any one of claims 1-4 2 In-process CO 2 The dynamic method is characterized by comprising the following steps:
the method comprises the following steps: prefabricating a quartz sandstone board model (1), connecting devices and closing all valves (4);
step two: starting a vacuum pump (13) and a corresponding valve (4) to vacuumize the quartz sandstone plate (23) to saturate brine, and closing the vacuum pump (13) and the corresponding valve (4) after reaching the preset time;
step three: starting a back pressure pump (9), setting to a preset pressure, opening an injection pump (2), an inlet end valve (4) of a quartz sand rock plate model (1) and valves (4) at two ends of a saline container, injecting saline into a quartz sand rock plate (23), synchronously starting a confining pressure pump (7) and a hydraulic oil (6) corresponding valve (4) to inject the hydraulic oil (6) into a hydraulic oil cavity (20) of the quartz sand rock plate model (1), maintaining the confining pressure of the quartz sand rock plate (23), enabling the pressure of the confining pressure pump (7) to be higher than the pressure of saline injection, and stopping injecting the saline when the volume of the saline injection reaches 5 times of the pore volume of the quartz sand rock plate;
step four: closing valves (4) at two ends of the brine container and opening CH 4 Valves (4) at both ends of the container, and CH is pumped by an injection pump (2) 4 Injecting the mixture into the quartz sandstone plate (23) until the brine is not produced at the outlet end, and realizing that the quartz sandstone plate (23) is saturated CH under the saturation of the bound water under certain surrounding pressure 4 When the state of (1) is in a certain state, the pore pressure of the quartz sandstone plate (23) reaches a certain value;
step five: close CH 4 Valves (4) at both ends of the container are opened and CO is turned on 2 Valves (4) at both ends of the vessel for feeding CO by means of an injection pump (2) 2 Injecting the gas into a quartz sandstone plate (23), continuously sampling and numbering the produced gas by using a sampling bag (12), and recording the sampling time;
step six: in the experiment process, interpolation calculation is carried out according to PH values obtained by PH probes (22) at different positions and different times in the quartz sandstone board model (1) to obtain the distribution of PH in the quartz sandstone board model (1), and the distribution of PH is converted into CO 2 Distribution of concentration, plotting CO 2 And (4) a concentration distribution dynamic graph.
Step seven: and (4) closing the injection pump (2), the back pressure pump (9), the confining pressure pump (7) and all the valves (4) and finishing the experiment.
6. The method according to claim 5, characterized in that in step one, the method for making the quartz sandstone slab model (1) comprises the following steps:
s1, mixing quartz sand and a bonding agent according to an experimental design size, pouring the mixture into a grinding tool for forming, pre-burying an injection pipeline (18), a production pipeline (24) and a PH probe (22) with a sealing screw (21) in a quartz sandstone plate (23), compacting and drying the quartz sandstone plate (23), and then carrying out fine processing to enable the quartz sandstone plate to reach the design size;
s2, placing the quartz sandstone board (23) in an epoxy resin pool, wrapping the quartz sandstone board (23) with an epoxy resin sealing layer with the thickness of not less than 2cm, compacting, drying and polishing the quartz sandstone board into a regular shape;
s3, placing the quartz sandstone board (23) wrapped with the epoxy resin in a water pool, and injecting air into the quartz sandstone board (23) to test the airtightness of the quartz sandstone board;
s4, placing the tested quartz sandstone board (23) into a prefabricated pressure-resistant shell (17), and sealing;
s5, injecting hydraulic oil (6) into the pressure-resistant shell (17) through a hydraulic oil injection port (16) on the pressure-resistant shell (17), and forming a hydraulic oil cavity (20) between the quartz sand rock plate (23) wrapped with epoxy resin and the pressure-resistant shell (17) so as to apply confining pressure on the quartz sand rock plate (23).
7. The method according to claim 5, characterized in that in step two, the vacuum pump (13) is turned off after 12 hours of evacuation of the quartz sand mould (1).
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