CN114859010B - Monitoring gas reservoir rock CO injection 2 In-process CO 2 Device and method for spreading dynamic - Google Patents
Monitoring gas reservoir rock CO injection 2 In-process CO 2 Device and method for spreading dynamic Download PDFInfo
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- CN114859010B CN114859010B CN202210293457.0A CN202210293457A CN114859010B CN 114859010 B CN114859010 B CN 114859010B CN 202210293457 A CN202210293457 A CN 202210293457A CN 114859010 B CN114859010 B CN 114859010B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 239000011435 rock Substances 0.000 title claims abstract description 18
- 230000007480 spreading Effects 0.000 title claims description 3
- 238000003892 spreading Methods 0.000 title claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 150
- 239000010453 quartz Substances 0.000 claims abstract description 118
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 54
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 29
- 239000000523 sample Substances 0.000 claims abstract description 27
- 239000003822 epoxy resin Substances 0.000 claims abstract description 24
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 24
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
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- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 10
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- 239000006004 Quartz sand Substances 0.000 claims description 32
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- 238000007789 sealing Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
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Abstract
The invention discloses a method for monitoring CO injection of rock of a gas reservoir 2 In-process CO 2 A dynamic device and a dynamic method 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 sandstone plate model is composed of a quartz sandstone 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 a production pipeline are pre-buried in the quartz sandstone plate. The invention adopts the PH probe to monitor the CO dissolved in the pore space of the porous medium at different positions in the model in real time 2 The pH of the brine was calculated to CO at this point 2 Is used for drawing CO in a large-scale porous medium in real time through a data analysis system 2 Can better simulate and monitor CO injection 2 In-process CO 2 Dynamic distribution law for rock CO injection of gas reservoir 2 Enhanced recovery and CO 2 Research on the buried mechanism 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 rock CO injection of a gas reservoir 2 In-process CO 2 Apparatus and methods for performing dynamic tasks.
Background
The continuous pressure drop in the development process of the gas reservoir will cause reservoir stress sensitivity and side bottom water invasion, so that the reservoir permeability is reduced and the reservoir water saturation is increased, and the productivity and the final reservoir recovery ratio of the gas well are seriously affected. Developed towards failureIn-process gas reservoir CO injection 2 Can effectively maintain or even improve the reservoir pressure, supplement the energy of the gas reservoir, delay the invasion of side bottom water, improve the productivity of a gas well and the final recovery ratio (CO) of the gas reservoir 2 EGR). Due to CO 2 And CH (CH) 4 Density difference of injected CO 2 Eventually collecting at the bottom of the gas reservoir to form CO 2 Gas cushion layer, CO 2 And CH (CH) 4 Can be stably distributed in a gas reservoir. Gas reservoirs as good geological traps, gas reservoirs injected with CO 2 CO is realized while the natural gas recovery ratio is improved 2 Is safely and efficiently buried.
CO 2 And CH (CH) 4 Seepage law and CO of mixed gas in reservoir 2 Is to determine gas reservoir CO 2 -a key factor of EGR effect. However, compared to gas-liquid seepage in reservoirs, CO 2 Is difficult to monitor, especially in the study of CO 2 Lack of accurate real-time monitoring of CO in physical simulation of EGR mechanism 2 Means for sweep dynamics cannot be realized for CO in porous media 2 Seepage and distribution rules are directly researched. In the prior part of experiments, the gas in the porous medium is sampled and analyzed to monitor the CO in the mixed gas 2 Concentration of (2) to determine CO 2 The distribution of the gas seepage and the distribution state are destroyed in the sampling process, and the real-time monitoring cannot be realized, so that the result cannot be convinced.
Disclosure of Invention
In view of this, the present invention discloses monitoring gas reservoir rock CO injection 2 In-process CO 2 Device and method for carrying out dynamic wave propagation, and method for monitoring CO dissolved in pores of porous medium at different positions in model in real time by adopting PH probe 2 The pH of the brine was calculated to CO at this point 2 Is used for drawing CO in a large-scale porous medium in real time through a data analysis system 2 To study gas reservoir CO injection 2 In-process CO 2 The seepage and sweep dynamics of (2) provide effective and reliable simulation experiment means.
According to the object of the invention, a method for monitoring the rock CO injection of a reservoir of a gas reservoir is proposed 2 In-process CO 2 Devices for imparting dynamic properties, including quartz sand plate mouldsThe system comprises 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 sandstone plate model is composed of a quartz sandstone 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 a production pipeline are pre-buried in the quartz sandstone plate.
The fluid injection system comprises a high-pressure container and an injection pump, wherein the high-pressure container is connected to an injection pipeline of the quartz sandstone plate model and is used for storing brine and CO of simulated formation water 2 And CH (CH) 4 And maintaining a certain fluid pressure; the injection pump is connected with the high-pressure container and is used for providing displacement pressure to inject fluid in the high-pressure container into the quartz sand plate through the injection pipeline.
The confining pressure applying system comprises a confining pressure pump and hydraulic oil, wherein the hydraulic oil is connected with the confining pressure pump and a hydraulic oil cavity in the quartz sandstone plate model, and the hydraulic oil cavity in the quartz sandstone plate model is injected with the hydraulic oil under the action of the confining pressure pump to maintain the confining pressure of the quartz sandstone plate.
The back pressure system comprises a back pressure pump and a back pressure valve, wherein the back pressure valve is connected to a quartz sandstone plate model production pipeline, the back pressure pump is connected with the back pressure valve, and the back pressure pump is combined with the back pressure valve to keep the pressure of the production end and simulate the bottom hole flow pressure.
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 detecting components of gas samples separated by the gas-liquid separator; the gas flowmeter is arranged on a connecting pipeline of the gas-liquid separator and the sampling bag and is used for measuring the volume of gas separated by the gas-liquid separator.
The vacuum pump is connected to the extraction pipeline of the quartz sandstone plate model and is used for vacuumizing the quartz sandstone plate to obtain saturated brine.
And valves and pressure gauges are arranged on connecting pipelines of the high-pressure container, the hydraulic oil, the vacuum pump and the back pressure valve and the quartz sandstone plate 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 25×25×10cm, and the size of the quartz sandstone plate after being coated with the epoxy resin is 29×29×14cm.
Preferably, 25 PH probes and matched sealing screws are uniformly distributed on the bottom surface and the top surface of the quartz sandstone plate respectively, and the injection pipeline and the extraction pipeline are buried at two sides of the quartz sandstone plate 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, PH probe line interfaces are reserved on the pressure-resistant shell, and hydraulic oil injection ports are respectively arranged at the upper left part and the lower right part of the pressure-resistant shell and are communicated with the hydraulic oil cavity.
The invention further discloses a method for monitoring the CO injection of the rock of the gas reservoir by using the device 2 In-process CO 2 A method of sweep dynamics comprising the steps of:
step one: and prefabricating the quartz sand plate model, connecting the devices, and closing all valves.
Step two: and (3) opening the vacuum pump and the corresponding valve to vacuumize the quartz sandstone plate with saturated brine, and closing the vacuum pump and the corresponding valve after reaching the preset time.
Step three: and starting a back pressure pump, setting to preset pressure, opening valves at the inlet end of the injection pump and the quartz sand plate model and valves at two ends of the brine container, injecting brine into the quartz sand plate, and synchronously starting a surrounding pressure pump and a valve corresponding to the hydraulic oil to inject the hydraulic oil into a hydraulic oil cavity of the quartz sand plate model, so as to maintain the surrounding pressure of the quartz sand plate, wherein the pressure of the surrounding pressure pump is higher than the pressure of the brine injection.
Step four: closing valves at two ends of brine container and opening CH 4 Valves at two ends of the container for pumping CH 4 Injecting into quartz sandstone plate until no more brine is produced at outlet end, and making quartz sandstone plate reach saturation CH under irreducible water saturation under certain surrounding pressure 4 The pore pressure of the quartz sandstone plate reaches a certain value.
Step five: closing CH 4 Valve at two ends of container and open CO 2 Valves at two ends of the container for injecting CO through the injection pump 2 And (3) injecting the gas into a quartz sandstone plate, continuously 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 plate model to obtain the distribution of PH in the quartz sandstone plate model, and the distribution is converted into CO 2 Concentration profile, plotting CO 2 Concentration profile dynamic diagram.
Step seven: closing the injection pump, the back pressure pump, the confining pressure pump and all valves, and ending 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 an adhesive according to experimental design size, pouring the mixture into a grinding tool for molding, embedding an injection pipeline, a production pipeline and a PH probe with a sealing screw in 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 plate in an epoxy resin pool, enabling the quartz sandstone plate to wrap an epoxy resin sealing layer with the thickness not less than 2cm, compacting, drying and polishing the quartz sandstone plate into a regular shape.
S3, placing the quartz sandstone plate coated with the epoxy resin in a water tank, and injecting air into the quartz sandstone plate to test the tightness of the quartz sandstone plate.
S4, placing the tested quartz sandstone plate into a prefabricated pressure-resistant shell, and sealing.
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 epoxy resin and the pressure-resistant shell so as to apply confining pressure to the quartz sandstone plate.
Preferably, in the second step, the vacuum pump is turned off after vacuumizing the quartz sandstone plate model for 12 hours.
Compared with the prior art, the method for monitoring the CO injection of the reservoir rock of the gas reservoir 2 In-process CO 2 The device and the method for the sweep dynamics have the advantages that:
(1) The invention adopts the PH probe to monitor the CO dissolved in the pore space of the porous medium at different positions in the model in real time 2 The pH of the brine was calculated to CO at this point 2 Is used for drawing CO in a large-scale porous medium in real time through a data analysis system 2 Can better simulate and monitor CO injection 2 In-process CO 2 Dynamic distribution law for rock CO injection of gas reservoir 2 Enhanced recovery and CO 2 Research on the mechanism of embedding provides an effective means.
(2) The invention adopts the design of filling hydraulic oil into the pressure-resistant shell and specially-made sealing screws, and solves the key problem that the physical model of the gas reservoir is not compatible with large size, pressure resistance and sealing performance.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being evident that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of monitoring gas reservoir rock CO injection 2 In-process CO 2 And a dynamic device structure diagram is adopted.
FIG. 2 is a diagram of the internal structure of a quartz sandstone plate model.
Fig. 3 is a top view of a quartz sandstone plate model.
In the figure: 1-a quartz sandstone plate model; 2-an injection pump; 3-a high pressure vessel; 4-valve; 5-a pressure gauge; 6-hydraulic oil; 7-a surrounding pressure pump; 8-back pressure valve; 9-a return pressure pump; 10-a gas-liquid separator; 11-a gas flow meter; 12-sampling bag; 13-a vacuum pump; 14-a data transmission line; 15-a computer; 16-hydraulic oil injection port; 17-a pressure housing; 18-an injection line; a 19-epoxy layer; 20-a hydraulic oil chamber; 21-a sealing screw; a 22-PH probe; 23-quartz sandstone plate; 24-production line; 25-support columns.
Detailed Description
The following is a brief description of embodiments of the present invention with reference to the accompanying drawings. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that all other embodiments obtained by a person having ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
Figures 1-3 illustrate a preferred embodiment of the present invention, which is described in detail.
Monitoring reservoir rock CO injection for a gas reservoir as shown in figure 1 2 In-process CO 2 The device for realizing the dynamic wave comprises a quartz sand 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 plate mold 1 is respectively a quartz sand plate 23, an epoxy resin layer 19, a hydraulic oil chamber 20 and a pressure-resistant housing 17 from inside to outside. The quartz sandstone plate 23 is prepared by mixing resin and 100-mesh quartz sand, the ratio of the resin to the 100-mesh quartz sand is 30:100, and the permeability of the finally formed quartz sandstone plate 23 is 10mD, and the porosity is 12%. The PH probe 22, the injection pipeline 18 and the extraction pipeline 24 are pre-buried in the quartz sandstone plate 23. The PH probes 22 are buried in the top surface and the bottom surface of the quartz sandstone plate 23 through special sealing screws 21, 25 PH probes are uniformly distributed on each surface, and the injection pipeline 18 and the extraction pipeline 24 are buried in two sides of the quartz sandstone plate 23 respectively. The epoxy resin layer 19 was wrapped outside the quartz sandstone plate 23 and had a thickness of 2cm. The pressure-resistant shell 17 is designed and manufactured according to the positions of the injection pipeline 18 and the extraction pipeline 24 of the quartz sandstone plate 23 and comprises a body and a cover, a PH probe 22 line interface is reserved on the pressure-resistant shell 17, and hydraulic oil injection ports 16 are further arranged on the upper left and the lower right. After the quartz sandstone plate 23 wrapped with epoxy resin is placed in the pressure-resistant shell 17, the interface is sealed by adopting a special sealing screw 21, a high-pressure sealing adhesive tape and a sealing ring, so that the tightness 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 bottom of the pressure housing 17 is also provided with a support column 25 to avoid the bottom surface of the quartz sand plate 23 sticking to the bottom of the housing 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 sand plate model 1 and is used for storing brine and CO of simulated formation water 2 And CH (CH) 4 And maintains a certain fluid pressure. 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 through the injection line 18 into the quartz sand plate 23.
The confining pressure applying system comprises a confining pressure pump 7 and hydraulic oil 6, wherein the hydraulic oil 6 is connected with the confining pressure pump 7 and a hydraulic oil cavity 20 in the quartz sandstone plate model 1, and the hydraulic oil 6 is injected into the hydraulic oil cavity 20 in the quartz sandstone plate model 1 under the action of the confining pressure pump 7 to maintain the confining pressure of the quartz sandstone plate 23.
The back pressure system comprises a back pressure pump 9 and a back pressure valve 8, wherein the back pressure valve 8 is connected to a production line 24 of the quartz sand plate model 1, the back pressure pump 9 is connected with the back pressure valve 8, and the back pressure valve 8 is combined to keep the pressure of the production end so as to simulate the bottom hole flow 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 detecting components of gas samples separated by the gas-liquid separator 10; the gas flowmeter 11 is disposed on a connection line between the gas-liquid separator 10 and the sampling bag 12, and is used for measuring the volume of gas separated by the gas-liquid separator 10.
The vacuum pump 13 is connected to the extraction line 24 of the quartz sand plate mold 1 for evacuating the quartz sand plate 23 with saturated brine.
The connecting lines of the high-pressure container 3, the hydraulic oil 6, the vacuum pump 13 and the back pressure valve 8 and the quartz sandstone plate model 1 are respectively provided with a valve 4 and a pressure gauge 5.
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 further discloses a useThe device monitors the rock CO injection of a gas reservoir 2 In-process CO 2 A method of sweep dynamics comprising the steps of:
step one: the quartz sand plate mould 1 is prefabricated and the device is connected such that all valves 4 are in a closed state. The manufacturing method of the quartz sandstone plate model 1 comprises the following steps:
s1, mixing resin with the proportion of 30:100 and quartz sand with the mesh of 100 according to the experimental design size, pouring the mixture into a grinding tool for molding, embedding an injection pipeline 18, a production pipeline 24 and a PH probe 22 with a sealing screw 21 into a quartz sandstone plate 23, pressing the quartz sandstone plate 23 for 12 hours at the temperature of 80 ℃ and the pressure of 20MPa, and carrying out fine processing after air drying molding for 24 hours, so that the length, the width and the height of the quartz sandstone plate are 25 x 10cm.
S2, placing the quartz sandstone plate 23 in an epoxy resin pool, enabling the quartz sandstone plate 23 to wrap an epoxy resin sealing layer with the thickness of 4cm, compacting, drying and polishing the epoxy resin sealing layer into a regular shape, wherein the size of the quartz sandstone plate 23 wrapped with the epoxy resin is 29 x 14cm.
S3, placing the quartz sandstone plate 23 wrapped with the epoxy resin in a water tank, and injecting air into the quartz sandstone plate 23 to test the tightness of the quartz sandstone plate.
S4, placing the tested quartz sandstone plate 23 into a prefabricated pressure-resistant shell 17, and sealing the interface by adopting a special sealing screw 21, a high-pressure sealing adhesive tape and a sealing ring.
S5, injecting hydraulic oil 6 into the pressure housing 17 through a hydraulic oil injection port 16 on the pressure housing 17, and forming a hydraulic oil cavity 20 between a quartz sandstone plate 23 wrapped with epoxy resin and the pressure housing 17 so as to apply confining pressure to the quartz sandstone plate 23.
Step two: and (3) opening the vacuum pump 13 and the corresponding valve 4 to vacuumize the quartz sandstone plate 23 with saturated brine, and closing the vacuum pump 13 and the valve 4 after vacuuming for 12 hours.
Step three: the back pressure pump 9 is started, the pressure is set to a preset pressure, the injection pump 2, the valves 4 at the inlet end of the quartz sand plate model 1 and the valves 4 at the two ends of the brine container are opened, brine is injected into the quartz sand plate 23, the surrounding pressure pump 7 and the corresponding valve 4 of the hydraulic oil 6 are synchronously started, the hydraulic oil 6 is injected into the hydraulic oil cavity 20 of the quartz sand plate model 1, and the surrounding pressure of the quartz sand plate 23 is maintained. The brine injection pressure is 1.2MPa, and the pressure of the surrounding pressure pump 7 is slightly higher than the brine injection pressure.
Step four: closing the valves 4 at both ends of the brine container and opening CH 4 Valves 4 at both ends of the container for introducing CH via the injection pump 2 4 Injecting into the quartz sandstone plate 23 until no more brine is produced by the gas-liquid separator 10, and realizing saturation CH of the quartz sandstone plate 23 under certain surrounding pressure under the condition of irreducible water saturation 4 The pore pressure of the quartz sand plate 23 reaches a certain value.
Step five: closing CH 4 Valve 4 at both ends of container and open CO 2 Valves 4 at both ends of the container for introducing CO through the injection pump 2 2 Is injected into the quartz sand plate 23, during which the produced gas is continuously sampled and numbered using the sampling bag 12, and the sampling time is recorded.
Step six: in the experimental process, the PH values obtained by the PH probes 22 at different positions and different times in the quartz sandstone plate model 1 are interpolated to obtain the distribution of PH in the quartz sandstone plate model 1, and are converted into CO 2 Concentration profile, plotting CO 2 Concentration profile dynamic diagram. Simultaneously marking pressure data, gas production accumulation volume and gas composition data of the injection and production ends of the quartz sandstone plate model 1 under different distribution states to comprehensively analyze CO 2 The concentration profile provides a data basis.
Step seven: the injection pump 2, the back pressure pump 9, the confining pressure pump 7 and all valves 4 were closed, and the experiment was 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 (4)
1. Monitoring gas reservoir rock CO injection 2 In-process CO 2 The dynamic wave device 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 plate model (1) is composed of a quartz sandstone plate (23), an epoxy resin layer (19), a hydraulic oil cavity (20) and a pressure-resistant shell (17) from inside to outside, wherein PH probes (22) with matched sealing screws (21), injection pipelines (18) and extraction pipelines (24) are embedded in the quartz sandstone plate (23), and the injection pipelines (18) and the extraction pipelines (24) are embedded in two sides of the quartz sandstone plate (23) respectively; 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 hydraulic oil injection ports (16) which are respectively arranged at the left upper part and the right lower part of the pressure-resistant shell (17) are communicated with a hydraulic oil cavity (20);
the manufacturing method of the quartz sandstone plate model (1) comprises the following steps:
s1, mixing quartz sand and an adhesive according to experimental design size, pouring the mixture into a grinding tool for molding, embedding an injection pipeline (18), a production pipeline (24) and a PH probe (22) with a sealing screw (21) into 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 plate (23) in an epoxy resin pool, enabling the quartz sandstone plate (23) to wrap an epoxy resin sealing layer with the thickness not less than 2cm, compacting, drying and polishing the epoxy resin sealing layer into a regular shape;
s3, placing the quartz sandstone plate (23) wrapped with the epoxy resin in a water tank, and injecting air into the quartz sandstone plate (23) to test the tightness of the quartz sandstone plate;
s4, placing the tested quartz sandstone plate (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 sandstone plate (23) wrapped with epoxy resin and the pressure-resistant shell (17) so as to apply confining pressure to the quartz sandstone 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 sand plate model (1) and is used for storing brine and CO of simulated formation water 2 And CH (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 sand plate (23) through the injection pipeline (18);
the confining pressure applying system comprises a confining pressure pump (7) and hydraulic oil (6), wherein the hydraulic oil (6) is connected with the confining pressure pump (7) and a hydraulic oil cavity (20) in the quartz sandstone plate model (1), and the hydraulic oil (6) is injected into the hydraulic oil cavity (20) in the quartz sandstone plate model (1) under the action of the confining pressure pump (7) to maintain the confining pressure of the quartz sandstone plate (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 plate model (1), the back pressure pump (9) is connected with the back pressure valve (8), and the back pressure valve (8) is combined to keep the pressure of the production end and simulate the bottom hole flow pressure;
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 detecting components of gas samples separated by the gas-liquid separator (10); 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 measuring the volume of gas separated by the gas-liquid separator (10);
the vacuum pump (13) is connected to a production line (24) of the quartz sandstone plate model (1) and is used for vacuumizing the quartz sandstone plate (23) to obtain saturated brine;
the high-pressure container (3), the hydraulic oil (6), the vacuum pump (13) and connecting lines of the back pressure valve (8) and the quartz sandstone plate model (1) are respectively provided with a valve (4) and a pressure gauge (5);
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);
monitoring gas reservoir rock CO injection using the device 2 In-process CO 2 A method of sweep dynamics comprising the steps of:
step one: prefabricating a quartz sandstone plate model (1), connecting the device, and closing all valves (4);
step two: starting a vacuum pump (13) and a corresponding valve (4) to vacuumize the quartz sandstone plate (23) with saturated brine, and closing the vacuum pump (13) and the corresponding valve (4) after reaching a 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 sandstone plate model (1) and valves (4) at two ends of a brine container, injecting brine into a quartz sandstone plate (23), synchronously starting a surrounding pressure pump (7) and a valve (4) corresponding to hydraulic oil (6) to inject the hydraulic oil (6) into a hydraulic oil cavity (20) of the quartz sandstone plate model (1), maintaining the surrounding pressure of the quartz sandstone plate (23), wherein the pressure of the surrounding pressure pump (7) is higher than the brine injection pressure, and stopping injecting the brine when the volume of the brine injection reaches 5 times of the pore volume of the quartz sandstone plate;
step four: closing valves (4) at two ends of the brine container and opening CH 4 Valves (4) at two ends of the container for injecting CH through an injection pump (2) 4 Injecting into the quartz sandstone plate (23) until the outlet end no longer produces salt water, so as to realize that the quartz sandstone plate (23) reaches saturation CH under the saturation of the irreducible water under a certain surrounding pressure 4 The pore pressure of the quartz sandstone plate (23) reaches a certain value;
step five: closing CH 4 Valves (4) at two ends of the container and opening CO 2 Valves (4) at two ends of the container for injecting CO through the injection pump (2) 2 Injecting the gas into a quartz sandstone plate (23), continuously numbering the produced gas by using a sampling bag (12), and recording the sampling time;
step six: in the experimental process, the PH value obtained by PH probes (22) at different positions and different times in the quartz sandstone plate model (1) is interpolated to obtain the distribution of PH in the quartz sandstone plate model (1), and the distribution is converted into CO 2 Concentration profile, plotting CO 2 A concentration profile dynamic map;
step seven: closing the injection pump (2), the back pressure pump (9), the confining pressure pump (7) and all valves (4), and ending the experiment.
2. Monitoring gas reservoir rock CO injection according to claim 1 2 In-process CO 2 The dynamic wave device is characterized in that the length, width and height of the quartz sandstone plate (23) are 25 x 10cm, and the size of the quartz sandstone plate after being coated with epoxy resin is 29 x 14cm.
3. Monitoring gas reservoir rock CO injection according to claim 1 2 In-process CO 2 The dynamic wave device is characterized in that 25 PH probes (22) are uniformly distributed on the bottom surface and the top surface of the quartz sandstone plate (23).
4. Monitoring gas reservoir rock CO injection according to claim 1 2 In-process CO 2 The device for spreading dynamic is characterized in that a vacuum pump (13) is used for vacuumizing the quartz sand plate model (1) for 12 hours and then is closed.
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