Fluid sealing simulation equipment

Abstract

The invention discloses fluid sealing simulation equipment, which comprises a sealing simulation device, a fluid injection device, a temperature regulation and control device and a pressure regulation and control device, and is characterized in that the sealing simulation device comprises a fluid sealing seat with a simulation cavity, and the fluid injection device comprises a fluid injection mechanism and a fluid injection pipe; the fluid injection mechanism is communicated with the simulation cavity through a fluid injection pipe, and the fluid injection mechanism is used for injecting simulation fluid and displacement fluid into the simulation cavity; the temperature regulation and control device comprises a first heating sleeve arranged on the fluid sealing seat in a sleeving mode, the pressure regulation and control device comprises a pressurization mechanism, the pressurization mechanism comprises an air supply piece, a pressurization pump and a pressurization air pipe, one end of the pressurization air pipe is communicated with the air supply piece, the other end of the pressurization air pipe is communicated with the fluid injection pipe, and the pressurization pump is arranged on the pressurization air pipe. The fluid sealing simulation equipment truly reflects the sealing condition of the displacement fluid under the conditions of high temperature and high pressure, and the accuracy of sealing simulation experiment results is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid storage, and particularly relates to a fluid storage simulation device. Background Art

[0002] CCUS (Carbon Capture, Utilization, and Storage) technology refers to carbon capture, utilization, and storage technology. CCUS technology is considered one of the important strategies to address climate change. In CCUS technology, the storage of carbon dioxide is the most important link. During the carbon dioxide storage process, after carbon dioxide is injected into the formation, it will form a multiphase system with the original fluid in the formation. The migration and evolution of the carbon dioxide multiphase system and the geological storage process under high temperature and high pressure conditions are extremely complex, and the dynamic distribution characteristics of carbon dioxide geological storage at the micro-nano scale are even more difficult to clarify.

[0003] Currently, conventional carbon dioxide storage simulation experimental methods (core experiments, nuclear magnetic experiments, etc.) cannot directly observe the migration and evolution of the carbon dioxide multiphase system and the dynamic storage distribution, and the storage simulation experiments can only be carried out under normal temperature and pressure conditions, unable to accurately reflect the storage status of the carbon dioxide multiphase system under the real formation temperature and pressure conditions, thereby reducing the accuracy of the storage simulation experimental results. Summary of the Invention

[0004] In view of the above defects or deficiencies, the present invention provides a fluid storage simulation device, aiming to solve the technical problem that the existing technology cannot accurately reflect the storage status of the carbon dioxide multiphase system under the real formation temperature and pressure conditions.

[0005] To achieve the above object, the present invention provides a fluid storage simulation device, which includes:

[0006] A storage simulation device, including a fluid storage seat having a simulation cavity;

[0007] A fluid injection device, including a fluid injection mechanism and a fluid injection pipe. The fluid injection mechanism is connected to the simulation cavity through the fluid injection pipe, and the fluid injection mechanism is used to inject simulation fluid and displacement fluid into the simulation cavity;

[0008] A temperature control device, including a first heating jacket sleeved on the fluid storage seat;

[0009] A pressure control device, including a pressurizing mechanism. The pressurizing mechanism includes a gas supply member, a booster pump, and a pressurizing gas pipe. One end of the pressurizing gas pipe is connected to the gas supply member, the other end of the pressurizing gas pipe is connected to the fluid injection pipe, and the booster pump is arranged on the pressurizing gas pipe.

[0010] In an embodiment of the present invention, the pressure regulation device further includes a pressure maintaining mechanism and an injection pressure sensor. The pressure maintaining mechanism includes a pressure maintaining pump, a pressure holding valve, and a pressure maintaining communication pipe. One end of the pressure maintaining communication pipe is connected to the pressure maintaining pump, and the other end of the pressure maintaining communication pipe is connected to the simulation chamber. The pressure holding valve is provided on the pressure maintaining communication pipe. The injection pressure sensor is provided on the fluid injection pipe and is used to detect the fluid injection pressure value. The fluid storage simulation device further includes a controller, which is respectively communicatively connected to the pressure maintaining pump, the pressure holding valve, and the injection pressure sensor, and the controller is configured to: set the pressure maintaining value of the pressure holding valve according to the fluid injection pressure value, and control the operation or stop of the pressure maintaining pump.

[0011] In an embodiment of the present invention, the fluid storage seat includes a seat body and a storage layer simulation plate. The seat body is provided with an installation groove, an injection channel, and a discharge channel. The storage layer simulation plate is arranged in the installation groove and is provided with a simulation chamber. The simulation chamber has an injection port and a discharge port. The fluid injection pipe is connected to the injection port through the injection channel, and the pressure maintaining communication pipe is connected to the discharge port through the discharge channel.

[0012] In an embodiment of the present invention, the injection channel includes a first injection section and a second injection section. The seat body is further provided with a first cleaning and discharging channel. One end of the first injection section is connected to the fluid injection pipe, and the other end of the first injection section branches and is connected to the second injection section and the first cleaning and discharging channel and is provided with a first cleaning and discharging valve. The first cleaning and discharging valve is used to select one of the second injection section and the first cleaning and discharging channel to be connected to the first injection section, and the second injection section is used to be connected to the injection port;

[0013] The discharge channel includes a first discharge section and a second discharge section. The seat body is further provided with a second cleaning and discharging channel. One end of the first discharge section is used to be connected to the discharge port, and the other end of the first discharge section branches and is connected to the second discharge section and the second cleaning and discharging channel and is provided with a second cleaning and discharging valve. The second cleaning and discharging valve is used to select one of the second discharge section and the second cleaning and discharging channel to be connected to the first discharge section, and the second discharge section is connected to the pressure maintaining communication pipe.

[0014] In an embodiment of the present invention, the storage simulation device further includes a storage protection mechanism. The storage protection mechanism includes a differential pressure compensation pump, a compensation switch valve, and a differential pressure compensation pipe. The seat body is further provided with a differential pressure compensation chamber communicating with the installation groove. One end of the differential pressure compensation pipe is connected to the differential pressure compensation pump, and the other end of the differential pressure compensation pipe is connected to the differential pressure compensation chamber. The compensation switch valve is provided on the differential pressure compensation pipe, and the differential pressure compensation pump and the compensation switch valve are respectively communicatively connected to the controller. The controller is further configured to: control the operation or stop of the differential pressure compensation pump according to the fluid injection pressure value, and adjust the opening degree of the compensation switch valve.

[0015] In an embodiment of the present invention, the pressure regulation device further includes a vacuum extraction pipe and a vacuum pump. The pressure maintaining communication pipe includes a first communication section and a second communication section. One end of the first communication section is communicated with the simulation chamber, and the other end of the first communication section branches and is communicated with the vacuum extraction pipe and the second communication section. The end of the vacuum extraction pipe far from the first communication section is communicated with the vacuum pump, the end of the second communication section far from the first communication section is communicated with the pressure maintaining pump, and the pressure maintaining valve is arranged on the second communication section.

[0016] In an embodiment of the present invention, the sealed simulation device further includes an image acquisition device. The image acquisition device is arranged on the fluid sealing seat and is used to acquire the simulated fluid image and the fluid sealing image in the simulation chamber. The image acquisition device is communicatively connected with the controller, and the controller is further configured to:

[0017] Respectively obtain the simulated fluid image and the fluid sealing image;

[0018] Perform pore-throat segmentation processing on the simulated fluid image and obtain a first result. The first result includes the pore structure and the throat structure in the simulated fluid image;

[0019] Perform oil-liquid-gas three-phase segmentation processing on the fluid sealing image and obtain a second result. The second result includes the oil-phase image, the liquid-phase image, and the gas-phase image in the fluid sealing image;

[0020] Perform bitwise operation processing on the first result and the second result to determine the distribution of the oil phase, the liquid phase, and the gas phase in the pore structure and the throat structure.

[0021] In an embodiment of the present invention, the fluid injection mechanism includes a liquid supply pump, a liquid supply communication pipe, and a fluid storage cylinder. The fluid storage cylinder includes a cylinder body and a piston. The piston is movably arranged in the cylinder body and divides the inner cavity of the cylinder body into a liquid drive cavity and a fluid storage cavity. The liquid supply pump is communicated with the liquid drive cavity through the liquid supply communication pipe to drive the piston to move. The fluid storage cavity is used to contain the simulated fluid or the displacement fluid, and the fluid storage cavity is communicated with the simulation chamber through the fluid injection pipe.

[0022] In an embodiment of the present invention, the number of fluid storage cylinders is set to at least two. At least one fluid storage cylinder is used to contain the simulated fluid, and at least one fluid storage cylinder is used to contain the displacement fluid. The liquid supply communication pipe includes a liquid supply main pipe and a plurality of liquid supply branch pipes. One end of the liquid supply main pipe is communicated with the liquid supply pump, the other end of the liquid supply main pipe branches and is communicated with the plurality of liquid supply branch pipes. The number of liquid supply branch pipes is the same as the number of fluid storage cylinders and is correspondingly communicated with the liquid drive cavities of the plurality of fluid storage cylinders one by one. And a liquid supply switch valve is respectively arranged on each liquid supply branch pipe. The end of the fluid injection pipe far from the simulation chamber branches and is communicated with the fluid storage cavities of the plurality of fluid storage cylinders.

[0023] In an embodiment of the present invention, the temperature control device further includes a second heating jacket, which is arranged on the fluid storage cylinder; the temperature control device further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is arranged on the fluid sealing seat and is used to detect the sealing temperature value, and the second temperature sensor is arranged on the fluid storage cylinder and is used to detect the heating temperature value.

[0024] Through the above technical solutions, the fluid sealing simulation device provided by the embodiment of the present invention has the following beneficial effects:

[0025] In the technical solution of the present invention, the fluid injection mechanism can inject the simulated fluid and the displacement fluid into the simulation cavity of the fluid sealing seat through the fluid injection pipe. A first heating jacket is sleeved on the fluid sealing seat. The gas supply member is connected to the fluid injection pipe through a pressurizing air pipe, and a pressurizing pump is arranged on the pressurizing air pipe; when performing the fluid sealing simulation experiment, first, the fluid injection mechanism injects the simulated fluid into the fluid injection pipe, so that the simulated fluid is injected into the simulation cavity along the fluid injection pipe to simulate the real formation condition. Then, the fluid injection mechanism injects the displacement fluid into the fluid injection pipe. The gas supply member supplies gas into the pressurizing air pipe. By adjusting the pressurizing pump, the gas pressure in the pressurizing air pipe is regulated. The pressurizing air pipe is connected to the fluid injection pipe so that the gas pressure acts on the displacement fluid in the fluid injection pipe, and the pressurizing pump can be flexibly adjusted according to the actual formation pressure condition to accurately regulate the magnitude of the gas pressure, realizing the simulation of the sealing condition of the displacement fluid under the real formation pressure condition. Moreover, a first heating jacket is arranged on the fluid sealing seat, and the first heating jacket is used to heat the fluid sealing seat, and the heating temperature of the first heating jacket can be flexibly adjusted according to the actual formation temperature condition, realizing the simulation of the sealing condition of the displacement fluid under the real formation temperature condition. By observing and recording the process of the displacement fluid displacing the simulated fluid in the simulation cavity, the sealing condition of the displacement fluid under high temperature and high pressure conditions is truly reflected, greatly improving the accuracy of the sealing simulation experiment results.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific embodiments section. BRIEF DESCRIPTION OF THE DRAWINGS [[ID=,13]]

[0027] The drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. They are used together with the following specific embodiments to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a fluid sealing simulation device according to an embodiment of the present invention;

[0029] Figure 2Schematic structural diagram of a sealing simulation device according to an embodiment of the present invention;

[0030] Figure 3 Schematic structural diagram of a fluid injection device according to an embodiment of the present invention;

[0031] Figure 4 Schematic structural diagram of a pressurization mechanism in a pressure regulation device according to an embodiment of the present invention;

[0032] Figure 5 Schematic structural diagram of a pressure maintaining mechanism in a pressure regulation device according to an embodiment of the present invention;

[0033] Figure 6 Schematic structural diagram of a fluid sealing seat according to an embodiment of the present invention;

[0034] Figure 7 Schematic structural diagram of a seat body in a fluid sealing seat according to an embodiment of the present invention;

[0035] Figure 8 Schematic structural diagram of a sealing layer simulation plate in a fluid sealing seat according to an embodiment of the present invention;

[0036] Figure 9 Schematic block diagram of a fluid sealing simulation device according to an embodiment of the present invention;

[0037] Figure 10 Schematic flow diagram of a controller for processing an image according to an embodiment of the present invention;

[0038] Figure 11 Schematic diagram of a first result generated by a controller for performing pore-throat segmentation processing on a simulated fluid image according to an embodiment of the present invention;

[0039] Figure 12 Distribution diagram generated by a controller for performing bitwise operation processing on a first result and a second result according to an embodiment of the present invention.

[0040] Explanation of reference numerals

[0041] 10 Sealing simulation device 222 Injection branch pipe

[0042] 11 Simulation cavity 2221 Injection sub-valve

[0043] 111 Injection port 223 Second drain branch pipe

[0044] 112 Drain port 2231 Injection drain main valve

[0045] 12 Fluid sealing seat 224 Third drain branch pipe

[0046] 121 Seat body 2241 Injection drain sub-valve

[0047] 1211 Installation groove 30 Temperature control device

[0048] 1212 Differential pressure compensation chamber 31 First heating sleeve

[0049] 1213 Compensation drain pipe 32 Second heating sleeve

[0050] 1214 Compensation drain valve 33 First temperature sensor

[0051] 122 Sealing layer simulation board 34 Second temperature sensor

[0052] 123 Injection channel 40 Pressure control device

[0053] 1231 First injection section 41 Boosting mechanism

[0054] 1232 Second injection section 411 Air supply component

[0055] 124 Discharge channel 412 Boosting pump

[0056] 1241 First discharge section 413 Boosting air pipe

[0057] 1242 Second discharge section 414 Gas storage tank

[0058] 125 First cleaning and discharging channel 415 Pressure regulating valve

[0059] 126 First cleaning and discharging valve 416 Boosting pressure gauge

[0060] 127 Second cleaning and discharging channel 417 Safety valve

[0061] 128 Second cleaning and discharging valve 418 Boosting drain pipe

[0062] 13 Sealing and protection mechanism 4181 Boosting drain valve

[0063] 131 Differential pressure compensation pump 4182 Drain pressure gauge

[0064] 132 Compensation switch valve 42 Pressure maintaining mechanism

[0065] 133 Differential pressure compensation pipe 421 Pressure maintaining pump

[0066] 134 Compensation pressure sensor 422 Pressure holding valve0]

[0067] 20 Fluid injection device 423 Pressure maintaining connecting pipe

[0068] 21 Fluid injection mechanism 4231 First connecting section

[0069] 211 Liquid supply pump 4232 Second communication section

[0070] 212 Liquid supply connecting pipe 424 Discharge pressure sensor

[0071] 2121 Main liquid supply pipe 425 Pressure maintaining pressure sensor

[0072] 2122 Liquid supply branch pipe 426 Pressure maintaining switch valve

[0073] 2123 Liquid supply switch valve 427 Buffer tank

[0074] 2124 First drain branch pipe 428 Fluid collection pipe

[0075] 2125 Liquid supply drain valve 429 Pressure maintaining drain pipe

[0076] 213 Fluid storage cylinder 4291 Pressure maintaining drain valve

[0077] 2131 Cylinder body 43 Injection pressure sensor

[0078] 2132 Piston 44 Vacuum extraction pipe

[0079] 2133 Liquid drive chamber 441 Vacuum extraction valve

[0080] 2134 Fluid storage chamber 45 Vacuum pump

[0081] 22 Fluid injection pipe 50 Controller

[0082] 221 Injection main pipe 60 Image acquisition device

[0083] 2211 Injection main valve Detailed implementation manners

[0084] The following describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and understanding the present invention, and are not used to limit the present invention.

[0085] The fluid sealing simulation device of the present invention will be described below with reference to the accompanying drawings.

[0086] As Figures 1 to 6As shown in the figure, the present invention provides a fluid sequestration simulation device. The fluid sequestration simulation device includes a sequestration simulation device 10, a fluid injection device 20, a temperature control device 30, and a pressure control device 40. The sequestration simulation device 10 includes a fluid sequestration seat 12 having a simulation cavity 11. The fluid injection device 20 includes a fluid injection mechanism 21 and a fluid injection pipe 22. The fluid injection mechanism 21 is communicated with the simulation cavity 11 through the fluid injection pipe 22, and the fluid injection mechanism 21 is used to inject a simulation fluid and a displacement fluid into the simulation cavity 11. The temperature control device 30 includes a first heating sleeve 31 sleeved on the fluid sequestration seat 12. The pressure control device 40 includes a pressurization mechanism 41. The pressurization mechanism 41 includes a gas supply member 411, a booster pump 412, and a pressurized gas pipe 413. One end of the pressurized gas pipe 413 is communicated with the gas supply member 411, and the other end of the pressurized gas pipe 413 is communicated with the fluid injection pipe 22. The booster pump 412 is arranged on the pressurized gas pipe 413.

[0087] It should be noted that the fluid sequestration simulation device of the present invention is used to simulate the sequestration status of fluids. The fluid can be a liquid, a gas, a supercritical fluid, etc. The fluid sequestration simulation device of the present invention places no restrictions on the type of fluid. The embodiments of the present invention are only described by taking the simulation of carbon dioxide fluid sequestration into a formation to displace formation crude oil as an example. Specifically, there is formation crude oil stored in the formation. Carbon dioxide fluid such as carbon dioxide gas and carbon dioxide liquid is injected into the formation, so that the carbon dioxide fluid displaces the formation crude oil to achieve the sequestration of the carbon dioxide fluid. Among them, during the process of the carbon dioxide fluid displacing the formation crude oil, a carbon dioxide multiphase system coexisting in multiple phases (gas phase, liquid phase, etc.) is formed under the action of formation temperature and formation pressure. The fluid sequestration simulation device is used to simulate the migration, evolution, and sequestration status of the carbon dioxide multiphase system under the conditions of real formation temperature and pressure.

[0088] Specifically, the fluid injection mechanism 21 can inject simulated fluid and displacement fluid into the simulation cavity 11 of the fluid storage seat 12 through the fluid injection pipe 22. Among them, the simulated fluid is set as formation crude oil, and the displacement fluid is set as carbon dioxide fluid. A first heating sleeve 31 is sleeved on the fluid storage seat 12. The gas supply member 411 is connected to the fluid injection pipe 22 through the pressurizing gas pipe 413, and a booster pump 412 is provided on the pressurizing gas pipe 413. When conducting the fluid storage simulation experiment, first, the fluid injection mechanism 21 injects the simulated fluid into the fluid injection pipe 22, so that the simulated fluid is injected into the simulation cavity 11 along the fluid injection pipe 22 to simulate the real formation oil storage condition. Then, the fluid injection mechanism 21 injects the displacement fluid into the fluid injection pipe 22. The gas supply member 411 supplies gas into the pressurizing gas pipe 413. By adjusting the booster pump 412, the gas pressure in the pressurizing gas pipe 413 is regulated. The pressurizing gas pipe 413 is connected to the fluid injection pipe 22 so that the gas pressure acts on the displacement fluid in the fluid injection pipe 22, and the booster pump 412 can be flexibly adjusted according to the actual formation pressure to accurately regulate the magnitude of the gas pressure, realizing the simulation of the storage condition of the displacement fluid under the real formation pressure condition. Moreover, a first heating sleeve 31 is provided on the fluid storage seat 12. The first heating sleeve 31 is used to heat the fluid storage seat 12 and can flexibly adjust the heating temperature of the first heating sleeve 31 according to the actual formation temperature, realizing the simulation of the storage condition of the displacement fluid under the real formation temperature condition. By observing and recording the process of the displacement fluid displacing the simulated fluid in the simulation cavity 11, the storage condition of the displacement fluid under high temperature and high pressure conditions is truly reflected, greatly improving the accuracy of the storage simulation experiment results.

[0089] Furthermore, the gas pressure in the pressurizing gas pipe 413 is set to 0.01 MPa to 70 MPa. The gas supply member 411 can adopt an air compressor in the prior art so that the gas supply member 411 can supply gas into the pressurizing gas pipe 413. The booster pump 412 is provided on the pressurizing gas pipe 413 and can regulate the gas pressure in the pressurizing gas pipe 413 according to the real formation pressure, so that the gas pressure acts on the displacement fluid during the process of injecting the displacement fluid into the simulation cavity 11 through the pressurizing gas pipe 413 and the fluid injection pipe 22 to truly simulate the storage condition of the displacement fluid under high pressure conditions. Moreover, the heating temperature of the first heating sleeve 31 is set to 20 °C to 180 °C. The first heating sleeve 31 can heat the fluid storage seat 12 according to the real formation temperature to truly simulate the storage condition of the displacement fluid under high temperature conditions, improving the accuracy and authenticity of the carbon dioxide fluid simulation storage experiment.

[0090] In an embodiment of the present invention, the pressure regulation device 40 further includes a pressure maintaining mechanism 42 and an injection pressure sensor 43. The pressure maintaining mechanism 42 includes a pressure maintaining pump 421, a pressure holding valve 422, and a pressure maintaining communication pipe 423. One end of the pressure maintaining communication pipe 423 is connected to the pressure maintaining pump 421, and the other end of the pressure maintaining communication pipe 423 is connected to the simulation chamber 11. The pressure holding valve 422 is disposed on the pressure maintaining communication pipe 423. The injection pressure sensor 43 is disposed on the fluid injection pipe 22 and is used to detect the fluid injection pressure value. The fluid storage simulation device further includes a controller 50. The controller 50 is respectively communicatively connected to the pressure maintaining pump 421, the pressure holding valve 422, and the injection pressure sensor 43, and the controller 50 is configured to: set the pressure maintaining value of the pressure holding valve 422 according to the fluid injection pressure value, and control the operation or stop of the pressure maintaining pump 421.

[0091] As Figure 1 , Figure 5 and Figure 9 shown, an injection pressure sensor 43 is disposed at one end of the fluid injection pipe 22 close to the fluid storage seat 12. The injection pressure sensor 43 is used to detect the fluid injection pressure value of the fluid injected from the fluid injection pipe 22 into the simulation chamber 11. The pressure maintaining pump 421 is connected to the simulation chamber 11 through the pressure maintaining communication pipe 423, and a pressure holding valve 422 is disposed on the pressure maintaining communication pipe 423. The pressure maintaining pump 421 is used to pump liquid or gas into the pressure maintaining communication pipe 423. The pressure holding valve 422 is used to adjust the liquid pressure or gas pressure in the pressure maintaining communication pipe 423 to be equal to the fluid injection pressure value, so that the simulated fluid and the displacement fluid in the simulation chamber 11 can flow out of the simulation chamber 11 into the pressure maintaining communication pipe 423 only by overcoming the fluid injection pressure value, ensuring the constant pressure in the simulation chamber 11, further improving the simulation authenticity and experimental accuracy; and, the injection pressure sensor 43 is used to send the detected fluid injection pressure value to the controller 50. The controller 50 obtains the fluid injection pressure value and controls the operation of the pressure maintaining pump 421 according to the fluid injection pressure value, and sets the pressure maintaining value of the pressure holding valve 422 to be equal to the fluid injection pressure value, so that the pressure exerted by the pressure maintaining mechanism 42 on the simulation chamber 11 is equal to the fluid injection pressure value, and the pressure maintaining adjustment is accurate and reliable, effectively preventing the pressure imbalance in the simulation chamber 11.

[0092] In an embodiment of the present invention, the fluid storage seat 12 includes a seat body 121 and a storage layer simulation plate 122. An installation groove 1211, an injection channel 123, and a discharge channel 124 are formed on the seat body 121. The storage layer simulation plate 122 is disposed in the installation groove 1211 and is provided with a simulation chamber 11. The simulation chamber 11 has an injection port 111 and a discharge port 112. The fluid injection pipe 22 is connected to the injection port 111 through the injection channel 123, and the pressure maintaining communication pipe 423 is connected to the discharge port 112 through the discharge channel 124.

[0093] AsFigures 6 to 8 As shown, an installation groove 1211 for installing the sealed layer simulation plate 122 is formed on the seat body 121. A simulation cavity 11 is formed in the sealed layer simulation plate 122. The sealed layer simulation plate 122 is made of glass. In the simulation cavity 11, lines simulating the pores of the formation core can be etched by using the glass etching process in the prior art. The injection port 111, the injection channel 123, and the fluid injection pipe 22 of the simulation cavity 11 are sequentially connected, so that the simulated fluid can be injected from the fluid injection mechanism 21 into the simulation cavity 11 etched with the core pore lines to simulate the real formation oil storage condition, further improving the simulation authenticity and experimental accuracy. Moreover, the discharge port 112, the discharge channel 124, and the pressure maintaining communication pipe 423 of the simulation cavity 11 are sequentially connected, so that the displacement fluid pressure can displace the simulated fluid in the simulation cavity 11 into the pressure maintaining communication pipe 423 only when it is greater than the fluid injection pressure value, realizing the fluid sealing simulation experiment under high pressure conditions and further improving the accuracy of the experimental results.

[0094] In another embodiment of the present invention, the sealed layer simulation plate 122 can also be made of a formation core. Real core pores are distributed in the sealed layer simulation plate 122 made of the formation core, so that the simulated fluid injected into the simulation cavity 11 can simulate the real formation oil storage condition, further improving the simulation authenticity.

[0095] In the embodiment of the present invention, the sealing simulation device further includes an image acquisition device 60. The image acquisition device 60 includes a camera and a backlight module. The camera is arranged above the seat body 121 and is used to acquire the image of the simulation cavity 11. The backlight module is arranged below the seat body 121 and is used to provide light when the camera takes the image of the simulation cavity 11 to improve the image acquisition clarity. The camera is communicatively connected to the controller 50 and can transmit the acquired image information to the controller 50. The controller 50 receives the image information for processing, transmission, and display, realizing the observation of the migration evolution and dynamic sealing distribution of the carbon dioxide multiphase system in the core pores under high temperature and high pressure conditions, improving the simulation of the sealing simulation experiment, and further improving the accuracy of the experimental results. <s

[0096] In the embodiment of the present invention, the injection channel 123 includes a first injection section 1231 and a second injection section 1232. A first cleaning and discharging channel 125 is further formed on the seat body 121. One end of the first injection section 1231 is connected to the fluid injection pipe 22. The other end of the first injection section 1231 branches and is connected to the second injection section 1232 and the first cleaning and discharging channel 125 and is provided with a first cleaning and discharging valve 126. The first cleaning and discharging valve 126 is used to select one of the second injection section 1232 and the first cleaning and discharging channel 125 to be connected to the first injection section 1231, and the second injection section 1232 is used to be connected to the injection port 111.

[0097] AsFigures 6 to 8 As shown, when conducting the fluid sequestration simulation experiment, first, the fluid injection mechanism 21 injects simulated fluid into the simulation chamber 11 successively through the fluid injection pipe 22, the first injection section 1231, and the second injection section 1232 to simulate the oil storage condition in formation pores. Then, the first drain valve 126 selects to connect the first drain channel 125 and the first injection section 1231. The fluid injection mechanism 21 injects displacement fluid into the fluid injection pipe 22, and the displacement fluid displaces the simulated fluid remaining in the fluid injection pipe 22 and the first injection section 1231, so that the remaining simulated fluid can flow out of the seat body 121 along the first drain channel 125, eliminating the influence of the dead volume of the simulated fluid on the sequestration simulation experiment and further improving the accuracy of the experimental results.

[0098] Furthermore, the discharge channel 124 includes a first discharge section 1241 and a second discharge section 1242. A second drain channel 127 is also provided on the seat body 121. One end of the first discharge section 1241 is used to communicate with the discharge port 112. The other end of the first discharge section 1241 branches to communicate with the second discharge section 1242 and the second drain channel 127 and is provided with a second drain valve 128. The second drain valve 128 is used to select one of the second discharge section 1242 and the second drain channel 127 to communicate with the first discharge section 1241, and the second discharge section 1242 is communicated with the pressure maintaining connecting pipe 423.

[0099] As Figures 6 to 8 shown, before and after the fluid sequestration simulation experiment, the injection channel 123, the discharge channel 124, and the simulation chamber 11 need to be cleaned. The fluid injection mechanism 21 injects cleaning liquid into the first injection section 1231. The first drain valve 126 selects to connect the first drain channel 125 and the first injection section 1231, so that the cleaning liquid displaces the fluid remaining in the first injection section 1231. The fluid remaining in the first injection section 1231 is discharged from the first drain channel 125. When there is no doped residual fluid in the cleaning liquid discharged in the first drain channel 125, it is determined that the first injection section 1231 is cleaned. The first drain valve 126 selects to connect the second injection section 1232 and the first injection section 1231, and the second drain valve 128 selects to connect the second drain channel 127 and the first discharge section 1241, so that the cleaning liquid displaces the fluid remaining in the second injection section 1232, the simulation chamber 11, and the first discharge section 1241. The fluid remaining in the second injection section 1232, the simulation chamber 11, and the first discharge section 1241 is discharged from the second drain channel 127. When there is no doped residual fluid in the cleaning liquid discharged in the second drain channel 127, it is determined that the second injection section 1232, the simulation chamber 11, and the first discharge section 1241 are cleaned, avoiding the influence of the dead volume formed by the residual fluid in the fluid sequestration seat 12 on the experimental results.

[0100] In an embodiment of the present invention, the encapsulation simulation device 10 further includes an encapsulation protection mechanism 13. The encapsulation protection mechanism 13 includes a differential pressure compensation pump 131, a compensation switch valve 132, and a differential pressure compensation pipe 133. A differential pressure compensation cavity 1212 communicating with the installation groove 1211 is further formed on the seat body 121. One end of the differential pressure compensation pipe 133 is communicated with the differential pressure compensation pump 131, the other end of the differential pressure compensation pipe 133 is communicated with the differential pressure compensation cavity 1212, the compensation switch valve 132 is arranged on the differential pressure compensation pipe 133, and the differential pressure compensation pump 131 and the compensation switch valve 132 are respectively communicatively connected with the controller 50. The controller 50 is further configured to: control the operation or stop of the differential pressure compensation pump 131 according to the fluid injection pressure value, and adjust the opening degree of the compensation switch valve 132.

[0101] As Figure 1 , Figure 2 and Figure 9 shown, the differential pressure compensation pump 131 is communicated with the differential pressure compensation cavity 1212 on the seat body 121 through the differential pressure compensation pipe 133, and a compensation switch valve 132 is arranged on the differential pressure compensation pipe 133. The differential pressure compensation pump 131 is used to pump water into the differential pressure compensation cavity 1212 through the differential pressure compensation pipe 133. The compensation switch valve 132 is used to adjust the water flow rate in the differential pressure compensation pipe 133 so that the water pressure in the differential pressure compensation cavity 1212 is equal to the fluid injection pressure value. The water pressure in the differential pressure compensation cavity 1212 acts on the encapsulation layer simulation plate 122, ensuring that the pressures inside and outside the encapsulation layer simulation plate 122 are consistent, effectively preventing the rupture of the encapsulation layer simulation plate 122 caused by the pressure in the simulation cavity 11 being greater than the pressure outside the encapsulation layer simulation plate 122, and improving the structural stability.

[0102] Furthermore, as Figure 1 and Figure 2 shown, a compensation pressure sensor 134 is arranged on the differential pressure compensation pipe 133. The compensation pressure sensor 134 is communicatively connected with the controller 50 and is used to detect the water pressure in the differential pressure compensation pipe 133, so that the controller 50 can control the operation status of the differential pressure compensation pump 131 and adjust the opening degree of the compensation switch valve 132 according to the fluid injection pressure value and the detection result of the compensation pressure sensor 134, so that the internal and external differential pressure of the encapsulation layer simulation plate 122 is always maintained between 0.5 MPa and 1.0 MPa, avoiding the rupture caused by the excessive internal and external differential pressure of the encapsulation layer simulation plate 122, and the differential pressure compensation is stable and reliable.

[0103] In an embodiment of the present invention, as Figure 1 and Figure 2As shown, the sealing and protection mechanism 13 further includes a compensation drain pipe 1213 and a compensation drain valve 1214. The compensation drain pipe 1213 is provided on the seat body 121 and communicates with the differential pressure compensation chamber 1212, so as to drain the water in the differential pressure compensation chamber 1212 after the sealing simulation experiment. The compensation drain valve 1214 is provided on the compensation drain pipe 1213 and is used to connect or disconnect the compensation drain pipe 1213, facilitating the quick drainage of the differential pressure compensation chamber 1212.

[0104] In the embodiment of the present invention, the seat body 121 includes a base and a gland. An installation groove 1211 and a differential pressure compensation chamber 1212 communicating with the installation groove 1211 are formed on the base. The injection channel 123 and the discharge channel 124 are both formed on the base. The gland is provided on the base to seal the installation groove 1211. The gland is detachably connected to the base to facilitate the installation of the sealing layer simulation plate 122 in the installation groove 1211 and the replacement of the sealing layer simulation plates 122 with different pore types, improving the versatility of the equipment. Moreover, an observation port is formed on the gland corresponding to the position of the installation groove 1211, and an observation window made of sapphire material is installed at the observation port to facilitate the observation of the carbon dioxide fluid storage condition in the core pores and the acquisition of image information by the camera, improving the clarity of image acquisition.

[0105] In the embodiment of the present invention, the pressure regulation device 40 further includes a vacuum extraction pipe 44 and a vacuum pump 45. The pressure maintaining communication pipe 423 includes a first communication section 4231 and a second communication section 4232. One end of the first communication section 4231 communicates with the simulation chamber 11, and the other end of the first communication section 4231 branches to communicate with the vacuum extraction pipe 44 and the second communication section 4232. The end of the vacuum extraction pipe 44 away from the first communication section 4231 communicates with the vacuum pump 45. The end of the second communication section 4232 away from the first communication section 4231 communicates with the pressure maintaining pump 421. The pressure maintaining valve 422 is provided on the second communication section 4232.

[0106] As Figure 1 and Figure 5 shown, before the fluid storage simulation experiment, the vacuum pump 45 evacuates the simulation chamber 11 to a vacuum state through the vacuum extraction pipe 44 and the first communication section 4231 to prevent the formation of bubbles in the simulation chamber 11 during the injection of the simulation fluid, which may interfere with the observation of fluid storage, further improving the accuracy of the storage simulation experiment. Moreover, a vacuum extraction valve 441 is provided on the vacuum extraction pipe 44. When the simulation chamber 11 is evacuated to a vacuum state, the vacuum extraction valve 441 is closed to disconnect the connection between the vacuum extraction pipe 44 and the first communication section 4231, so that the pressure maintaining value set by the pressure maintaining valve 422 on the second communication section 4232 can act on the discharge port 112 of the simulation chamber 11 through the first communication section 4231, thereby balancing the pressures at the injection port 111 and the discharge port 112 and effectively preventing the pressure imbalance in the simulation chamber 11.

[0107] In an embodiment of the present invention, the encapsulation simulation device further includes an image acquisition device 60. The image acquisition device 60 is disposed on the fluid encapsulation seat 12 and is used to acquire the simulated fluid image and the fluid encapsulation image in the simulation cavity 11. The image acquisition device 60 is communicatively connected to the controller 50. As Figure 10 shown, the controller 50 is further configured to:

[0108] Step S10, respectively obtain the simulated fluid image and the fluid encapsulation image;

[0109] Specifically, the controller 50 controls the image acquisition device 60 to acquire the simulated fluid image in the simulation cavity 11 after the simulated fluid is injected into the simulation cavity 11, and controls the image acquisition device 60 to acquire the fluid encapsulation image in the simulation cavity 11 at a preset time during the process of the displacement fluid displacing the simulated fluid. The controller 50 respectively obtains the simulated fluid image and the fluid encapsulation image. Among them, the simulated fluid image is used to reflect the pore condition of the core before fluid encapsulation, and the fluid encapsulation image is used to reflect the encapsulation condition of the fluid encapsulated into the simulation cavity 11 in real time.

[0110] Step S21, perform pore-throat segmentation processing on the simulated fluid image and obtain a first result. The first result includes the pore structure and the throat structure in the simulated fluid image;

[0111] Specifically, as Figure 11 shown, the pore structure and the throat structure of the core pore pattern are segmented from the simulated fluid image by the rotating ray method. By continuously judging whether the ray length touches the pore-throat skeleton boundary while rotating, the segmentation of the pore structure and the throat structure is realized, and then the basic attributes such as the number, position, and equivalent radius of the pore structure and the throat structure are determined.

[0112] Step S22, perform oil-liquid-gas three-phase segmentation processing on the fluid encapsulation image and obtain a second result. The second result includes the oil-phase image, the liquid-phase image, and the gas-phase image in the fluid encapsulation image;

[0113] Specifically, the oil phase, the liquid phase, and the gas phase in the fluid encapsulation image are respectively segmented from the matrix to determine the oil-phase image, the liquid-phase image, and the gas-phase image;

[0114] Step S30, perform bitwise operation processing on the first result and the second result to determine the distribution of the oil phase, the liquid phase, and the gas phase in the pore structure and the throat structure;

[0115] Specifically, the simulated fluid image after pore-throat segmentation processing is respectively subjected to bitwise operation processing with the oil-phase image, the liquid-phase image, and the gas-phase image to generate as Figure 12The diagram shows the distribution of the oil phase, liquid phase, and gas phase in the pore structure and throat structure. The fluid sequestration simulation device uses the microfluidic image preprocessing method to make the simulated fluid image and the fluid sequestration image at the preset time clearer, realizing the quantitative characterization of the distribution of fluid sequestration in the microscopic pore-throat structure and greatly improving the accuracy of the sequestration simulation experiment results.

[0116] In an embodiment of the present invention, the fluid injection mechanism 21 includes a liquid supply pump 211, a liquid supply connecting pipe 212, and a fluid storage cylinder 213. The fluid storage cylinder 213 includes a cylinder body 2131 and a piston 2132. The piston 2132 is movably arranged in the cylinder body 2131 and divides the inner cavity of the cylinder body 2131 into a liquid driving cavity 2133 and a fluid storage cavity 2134. The liquid supply pump 211 is connected to the liquid driving cavity 2133 through the liquid supply connecting pipe 212 to drive the piston 2132 to move. The fluid storage cavity 2134 is used to contain the simulated fluid or the displacement fluid, and the fluid storage cavity 2134 is connected to the simulation cavity 11 through a fluid injection pipe 22.

[0117] As Figure 1 and Figure 3 shown, the liquid supply pump 211 can pump liquid into the liquid driving cavity 2133 through the liquid supply connecting pipe 212 to push the piston 2132 to move, so that the piston 2132 pushes the liquid in the fluid storage cavity 2134 into the fluid injection pipe 22 to inject the simulated fluid and the displacement fluid into the simulation cavity 11. The piston 2132 plays a role in blocking the fluid storage cavity 2134, effectively preventing impurities from entering the fluid storage cavity 2134 and causing pollution, improving the experimental accuracy. And the liquid supply pump 211 can use a high-pressure plunger pump in the prior art, so that the fluid injection accuracy can reach ±0.0001 mL / min, and the injection pressure control accuracy can reach ±0.001 MPa. The injection is accurate and reliable, further improving the experimental accuracy.

[0118] Furthermore, the number of fluid storage cylinders 213 is set to at least two. At least one fluid storage cylinder 213 is used to contain the simulated fluid, and at least one fluid storage cylinder 213 is used to contain the displacement fluid. The liquid supply connecting pipe 212 includes a liquid supply main pipe 2121 and a plurality of liquid supply branch pipes 2122. One end of the liquid supply main pipe 2121 is connected to the liquid supply pump 211, and the other end of the liquid supply main pipe 2121 branches and is connected to the plurality of liquid supply branch pipes 2122. The number of the liquid supply branch pipes 2122 is the same as the number of the fluid storage cylinders 213 and is connected to the liquid driving cavities 2133 of the plurality of fluid storage cylinders 213 in one-to-one correspondence. And a liquid supply switch valve 2123 is respectively arranged on each liquid supply branch pipe 2122. The end of the fluid injection pipe 22 far from the simulation cavity 11 branches and is connected to the fluid storage cavities 2134 of the plurality of fluid storage cylinders 213.

[0119] In an embodiment of the present invention, as Figure 1 andFigure 3 As shown, the number of fluid storage cylinders 213 is set to three. In one of the fluid storage cylinders 213, the fluid storage chamber 2134 contains formation crude oil, i.e., the simulated fluid, and in the other two fluid storage cylinders 213, the fluid storage chambers 2134 contain carbon dioxide liquid and carbon dioxide gas respectively, i.e., the displacement fluids in two phases. By opening the liquid supply switch valves 2123 on the corresponding liquid supply branch pipes 2122, the formation crude oil, carbon dioxide liquid and carbon dioxide gas can be respectively injected into the simulation chamber 11 for fluid sequestration simulation experiments, effectively preventing external impurities from contaminating the simulated fluid and the displacement fluids, and enabling the injection of three fluids through one liquid supply pump 211, saving costs and improving the experimental efficiency.

[0120] In other embodiments of the present invention, the number of fluid storage cylinders 213 can also be set to two, four or other numbers. The number of liquid supply branch pipes 2122 is the same as the number of fluid storage cylinders 213 and is in one-to-one correspondence and communication with the liquid drive chambers 2133 of multiple fluid storage cylinders 213. The types of fluids stored in multiple fluid storage chambers 2134 can be flexibly set according to actual situations, improving the experimental flexibility.

[0121] Furthermore, as Figure 1 and Figure 3 shown, the liquid supply connecting pipe 212 further includes a first drain branch pipe 2124. The first drain branch pipe 2124 is communicated with the liquid supply main pipe 2121, and a liquid supply drain valve 2125 is provided on the first drain branch pipe 2124. When it is necessary to relieve pressure and drain the liquid supply connecting pipe 212, the liquid supply drain valve 2125 is opened so that the liquid in the liquid supply connecting pipe 212 is discharged from the first drain branch pipe 2124, and the pressure relief is convenient and fast.

[0122] In the embodiment of the present invention, the fluid injection pipe 22 includes an injection main pipe 221 and multiple injection branch pipes 222. One end of the injection main pipe 221 is communicated with the simulation chamber 11, and the other end of the injection main pipe 221 branches and is communicated with multiple injection branch pipes 222. The number of injection branch pipes 222 is the same as the number of fluid storage cylinders 213 and is in one-to-one correspondence and communication with the fluid storage chambers 2134 of multiple fluid storage cylinders 213.

[0123] As Figure 1 and Figure 3 shown, the simulated fluid and the displacement fluids in at least two fluid storage cylinders 213 can respectively flow into the injection main pipe 221 along the corresponding injection branch pipes 222 and be injected into the simulation chamber 11 along the injection main pipe 221, realizing the rapid injection of the simulated fluid and the displacement fluids and improving the experimental efficiency.

[0124] Further, an injection main valve 2211 is provided on the injection main pipe 221, and an injection branch valve 2221 is respectively provided on each injection branch pipe 222. The fluid injection pipe 22 further includes a second drain branch pipe 223 and a third drain branch pipe 224. The second drain branch pipe 223 is communicated with the injection main pipe 221, and an injection drain main valve 2231 is provided on the second drain branch pipe 223. Each injection branch pipe 222 is respectively communicated with a third drain branch pipe 224, and an injection drain branch valve 2241 is provided on the third drain branch pipe 224.

[0125] As Figure 1 and Figure 3 shown, the injection main valve 2211 is used to control the connection or disconnection state of the injection main pipe 221, and the injection branch valve 2221 is used to respectively control the connection or disconnection state of the corresponding injection branch pipe 222, so as to accurately control the injection flow rate and flow velocity of the simulated fluid and the displacement fluid, improve the experimental accuracy. Moreover, when it is necessary to relieve the pressure and drain the injection main pipe 221, the injection drain main valve 2231 is opened so that the fluid in the injection main pipe 221 is discharged from the second drain branch pipe 223, and when it is necessary to relieve the pressure and drain the injection branch pipe 222, the injection drain branch valve 2241 is opened so that the fluid in the corresponding injection branch pipe 222 is discharged from the third drain branch pipe 224, and the pressure relief is convenient and fast.

[0126] In the embodiment of the present invention, the temperature control device 30 further includes a second heating jacket 32, and the second heating jacket 32 is provided on the fluid storage cylinder 213; the temperature control device 30 further includes a first temperature sensor 33 and a second temperature sensor 34. The first temperature sensor 33 is provided on the fluid storage seat 12 and is used to detect the storage temperature value, and the second temperature sensor 34 is provided on the fluid storage cylinder 213 and is used to detect the heating temperature value.

[0127] As Figure 1 and Figure 3 shown, a second heating jacket 32 is provided on each fluid storage cylinder 213. The second heating jacket 32 is used to heat the simulated fluid or the displacement fluid in the fluid storage cylinder 213, realizing the storage condition of the displacement fluid under the simulated real formation temperature conditions. Moreover, the first sensor is used to detect the storage temperature value of the fluid storage seat 12 to determine the temperature in the simulation cavity 11 during the fluid storage process, and the second sensor is used to detect the heating temperature value of the second heating jacket 32 to determine the heating stability of the simulated fluid and the displacement fluid. The controller 50 is respectively communicatively connected with the first heating jacket 31, the first temperature sensor 33, the second heating jacket 32 and the second temperature sensor 34 to accurately control the temperature in the simulation cavity 11 during the fluid storage process, the heating temperature of the simulated fluid and the heating temperature of the displacement fluid, truly reflecting the storage condition of the displacement fluid under high temperature and high pressure conditions, and greatly improving the accuracy of the storage simulation experiment results.

[0128] In the embodiments of the present invention, as Figure 1 and Figure 4 shown, the pressurizing mechanism 41 further includes an air storage tank 414, a pressure regulating valve 415, a pressurizing pressure gauge 416, and a safety valve 417. The air storage tank 414 is arranged on the pressurizing air pipe 413 and is used to store pressurized gas to meet the air supply demand when it is necessary to quickly increase the fluid injection pressure or the fluid injection pressure is set relatively high, improving the pressurizing stability and reliability. The pressure regulating valve 415 is arranged on the pressurizing air pipe 413 and is used to regulate the gas pressure in the pressurizing air pipe 413, improving the convenience of air pressure regulation. The pressurizing pressure gauge 416 is arranged on the pressurizing air pipe 413 and is used to detect the gas pressure in the pressurizing air pipe 413, facilitating the adjustment of the pressure regulating valve 415 according to the detection result of the pressurizing pressure gauge 416, further improving the convenience of pressure regulation. The safety valve 417 is arranged on the pressurizing air pipe 413 and plays a role in overpressure protection, improving the structural stability.

[0129] Furthermore, as Figure 1 and Figure 4 shown, the pressurizing mechanism 41 further includes a pressurizing exhaust pipe 418 communicated with the pressurizing air pipe 413. A pressurizing exhaust valve 4181 is arranged on the pressurizing exhaust pipe 418. When it is necessary to relieve the pressure and exhaust the pressurizing air pipe 413, the pressurizing exhaust valve 4181 is opened so that the gas in the pressurizing air pipe 413 is discharged from the pressurizing exhaust pipe 418. The pressure relief is convenient and fast. And a exhaust pressure gauge 4182 for detecting the air pressure is also arranged on the pressurizing exhaust pipe 418 to facilitate observing the air pressure change during the gas exhaust process, improving the structural stability.

[0130] In the embodiments of the present invention, as Figure 1 and Figure 5 shown, the pressure maintaining mechanism 42 further includes a discharge pressure sensor 424 and a pressure maintaining pressure sensor 425. The discharge pressure sensor 424 is arranged at a position on the second communication section 4232 close to the first communication section 4231 to detect the fluid discharge pressure value. The discharge pressure sensor 424 is communicatively connected with the controller 50, thereby facilitating the confirmation of whether the fluid discharge pressure value is equal to the fluid injection pressure value, improving the pressure maintaining stability and reliability. The pressure maintaining pressure sensor 425 is arranged on the pressure maintaining valve 422 and is used to detect the actual pressure value in the pressure maintaining valve 422. The pressure maintaining pressure sensor 425 is communicatively connected with the controller 50, thereby facilitating the confirmation of whether the actual pressure value in the pressure maintaining valve 422 is equal to the set pressure maintaining value, further improving the pressure maintaining stability and reliability.

[0131] In the embodiments of the present invention, as Figure 1 and Figure 5As shown, the pressure-holding mechanism 42 further includes a pressure-holding switch valve 426 and a buffer tank 427. The pressure-holding switch valve 426 and the buffer tank 427 are both disposed on the second communication section 4232 and located between the pressure-holding valve 422 and the pressure-holding pump 421. The pressure-holding switch valve 426 is used to control the connection or disconnection between the pressure-holding pump 421 and the pressure-holding valve 422. The buffer tank 427 plays a role in storing energy and buffering. The setting of the pressure-holding switch valve 426 and the buffer tank 427 improves the accuracy of the pressure-holding valve 422, thereby improving the pressure-holding stability and reliability.

[0132] Furthermore, as Figure 1 and Figure 5 shown, the pressure-holding mechanism 42 further includes a fluid collection pipe 428 communicated with the pressure-holding valve 422. The simulated fluid and the displacement fluid discharged from the discharge port 112 can flow into the fluid collection pipe 428 along the first communication section 4231 and the second communication section 4232 and be discharged from the fluid collection pipe 428, so as to facilitate the collection of the simulated fluid and the displacement fluid and improve the environmental protection of the experiment. Moreover, the pressure-holding mechanism 42 further includes a pressure-holding evacuation pipe 429 communicated with the second communication section 4232. A pressure-holding evacuation valve 4291 is provided on the pressure-holding evacuation pipe 429. When it is necessary to relieve the pressure and evacuate the pressure-holding communication pipe 423, the pressure-holding evacuation valve 4291 is opened so that the gas in the pressure-holding communication pipe 423 is discharged from the pressure-holding evacuation pipe 429, and the pressure relief is convenient and fast.

[0133] In the embodiment of the present invention, as Figure 1As shown, when conducting the fluid sequestration simulation experiment, first, the sequestration simulation device 10 and the fluid injection device 20 are respectively cleaned with petroleum ether and deionized water, and then dried with nitrogen gas to reduce the interference of impurities on the sequestration simulation experiment. Then, the cleaned and dried sequestration layer simulation plate 122 is installed in the installation groove 1211 of the seat body 121 to ensure that the injection port 111 is connected to the injection channel 123 and the discharge port 112 is connected to the discharge channel. The position of the image acquisition device 60 is adjusted so that the image acquisition device 60 can capture and collect the image information of the simulation chamber 11 from above the seat body 121. After the position of the image acquisition device 60 is adjusted, the vacuum pump 45 is turned on, and the vacuum extraction pipe 44 evacuates the simulation chamber 11 and the differential pressure compensation chamber 1212 to a vacuum state. Then, the differential pressure compensation pump 131 is turned on to inject deionized water into the differential pressure compensation chamber 1212 through the differential pressure compensation pipe 133, preventing bubbles from interfering with the observation of the fluid sequestration process in the simulation chamber 11 and the differential pressure compensation chamber 1212. After the injection of deionized water into the differential pressure compensation chamber 1212 is completed, the first heating jacket 31 is controlled to heat the seat body 121 to the preset simulation temperature, and the second heating jacket 32 is controlled to heat the corresponding fluid storage cylinder 213 to the preset heating temperature. When the heating of the first heating jacket 31 and the second heating jacket 32 is completed, the pressure holding value of the pressure holding valve 422 is set to the preset pressure holding value, and the liquid supply pump 211 is turned on to enable the fluid storage cylinder 213 storing the simulated fluid to inject the simulated fluid into the simulation chamber 11 through the fluid injection pipe 22. When the injection pressure sensor 43 detects that the fluid injection pressure value is equal to the preset pressure holding value, it is determined that the simulated fluid injection is saturated. The image acquisition device 60 collects the image of the simulated fluid in the simulation chamber 11, completing the simulation of the actual formation oil storage condition. Further, the liquid supply pump 211 is turned on to inject the displacement fluid into the fluid injection pipe 22, and the residual simulated fluid is discharged through the first drainage channel 125 and the second drainage channel 127. When it is determined that the residual simulated fluid is emptied, the first injection section 1231, the second injection section 1232, and the injection port 111 are connected, and the discharge port 112, the first discharge section 1241, and the second discharge section 1242 are connected, so that the displacement fluid is injected into the simulation chamber 11 to displace the simulated fluid. The image acquisition device 60 collects the fluid sequestration images in the simulation chamber 11 at preset time intervals, realizing the real-time observation and recording of the flow, migration process, and dynamic sequestration characteristics of carbon dioxide multiphase fluid in the microscopic core pores, greatly improving the accuracy of the fluid sequestration simulation experiment results. It can be understood that after the fluid sequestration simulation experiment is completed, first, the pipeline is emptied and depressurized, and the equipment is cleaned with petroleum, deionized water, and nitrogen gas according to the actual experimental situation.

[0134] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0135] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0136] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0137] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A fluid storage simulation device, characterized in that, The fluid storage simulation device includes: A storage simulation device (10), including a fluid storage seat (12) having a simulation chamber (11); A fluid injection device (20), including a fluid injection mechanism (21) and a fluid injection pipe (22), the fluid injection mechanism (21) is communicated with the simulation chamber (11) through the fluid injection pipe (22), and the fluid injection mechanism (21) is used for injecting simulated fluid and displacement fluid into the simulation chamber (11); A temperature control device (30), including a first heating sleeve (31) sleeved on the fluid storage seat (12); A pressure control device (40), including a pressurizing mechanism (41), the pressurizing mechanism (41) includes a gas supply member (411), a booster pump (412) and a pressurizing air pipe (413), one end of the pressurizing air pipe (413) is communicated with the gas supply member (411), the other end of the pressurizing air pipe (413) is communicated with the fluid injection pipe (22), and the booster pump (412) is arranged on the pressurizing air pipe (413).

2. The fluid sequestration simulation device according to claim 1, wherein, The pressure control device (40) further includes a pressure maintaining mechanism (42) and an injection pressure sensor (43), the pressure maintaining mechanism (42) includes a pressure maintaining pump (421), a pressure maintaining valve (422) and a pressure maintaining communication pipe (423), one end of the pressure maintaining communication pipe (423) is communicated with the pressure maintaining pump (421), the other end of the pressure maintaining communication pipe (423) is communicated with the simulation chamber (11), the pressure maintaining valve (422) is arranged on the pressure maintaining communication pipe (423), the injection pressure sensor (43) is arranged on the fluid injection pipe (22) and is used for detecting the fluid injection pressure value, the fluid storage simulation device further includes a controller (50), the controller (50) is respectively in communication connection with the pressure maintaining pump (421), the pressure maintaining valve (422) and the injection pressure sensor (43), and the controller (50) is configured to: set the pressure maintaining value of the pressure maintaining valve (422) according to the fluid injection pressure value, and control the operation or stop of the pressure maintaining pump (421).

3. The fluid sequestration simulation device according to claim 2, wherein The fluid storage seat (12) includes a seat body (121) and a storage layer simulation plate (122), an installation groove (1211), an injection channel (123) and a discharge channel (124) are formed on the seat body (121), the storage layer simulation plate (122) is arranged in the installation groove (1211) and is provided with the simulation chamber (11), the simulation chamber (11) has an injection port (111) and a discharge port (112), the fluid injection pipe (22) is communicated with the injection port (111) through the injection channel (123), and the pressure maintaining communication pipe (423) is communicated with the discharge port (112) through the discharge channel (124).

4. The fluid sequestration simulation device according to claim 3, wherein The injection channel (123) includes a first injection section (1231) and a second injection section (1232). A first cleaning and discharging channel (125) is further formed on the seat body (121). One end of the first injection section (1231) is communicated with the fluid injection pipe (22). The other end of the first injection section (1231) branches to be communicated with the second injection section (1232) and the first cleaning and discharging channel (125), and is provided with a first cleaning and discharging valve (126). The first cleaning and discharging valve (126) is configured to select one of the second injection section (1232) and the first cleaning and discharging channel (125) to be communicated with the first injection section (1231), and the second injection section (1232) is used for being communicated with the injection port (111). The discharge channel (124) includes a first discharge section (1241) and a second discharge section (1242). A second cleaning and discharging channel (127) is further formed on the seat body (121). One end of the first discharge section (1241) is used for being communicated with the discharge port (112). The other end of the first discharge section (1241) branches to be communicated with the second discharge section (1242) and the second cleaning and discharging channel (127), and is provided with a second cleaning and discharging valve (128). The second cleaning and discharging valve (128) is configured to select one of the second discharge section (1242) and the second cleaning and discharging channel (127) to be communicated with the first discharge section (1241), and the second discharge section (1242) is communicated with the pressure maintaining communication pipe (423).

5. The fluid sequestration simulation device according to claim 3, wherein The encapsulation simulation device (10) further includes an encapsulation protection mechanism (13). The encapsulation protection mechanism (13) includes a differential pressure compensation pump (131), a compensation switch valve (132) and a differential pressure compensation pipe (133). A differential pressure compensation cavity (1212) communicated with the installation groove (1211) is further formed on the seat body (121). One end of the differential pressure compensation pipe (133) is communicated with the differential pressure compensation pump (131), and the other end of the differential pressure compensation pipe (133) is communicated with the differential pressure compensation cavity (1212). The compensation switch valve (132) is arranged on the differential pressure compensation pipe (133), and the differential pressure compensation pump (131) and the compensation switch valve (132) are respectively in communication connection with the controller (50). The controller (50) is further configured to: control the operation or stop of the differential pressure compensation pump (131) according to the fluid injection pressure value, and adjust the opening degree of the compensation switch valve (132).

6. The fluid sequestration simulation device according to claim 2, wherein The pressure regulation device (40) further includes a vacuum extraction pipe (44) and a vacuum pump (45). The pressure maintaining communication pipe (423) includes a first communication section (4231) and a second communication section (4232). One end of the first communication section (4231) is communicated with the simulation chamber (11). The other end of the first communication section (4231) branches and is communicated with the vacuum extraction pipe (44) and the second communication section (4232). One end of the vacuum extraction pipe (44) away from the first communication section (4231) is communicated with the vacuum pump (45). One end of the second communication section (4232) away from the first communication section (4231) is communicated with the pressure maintaining pump (421). The pressure maintaining valve (422) is arranged on the second communication section (4232).

7. The fluid seal simulation device according to claim 2, characterized in that The sealed simulation device further includes an image acquisition device (60). The image acquisition device (60) is arranged on the fluid sealed seat (12) and is used for acquiring the simulation fluid image and the fluid sealed image in the simulation chamber (11). The image acquisition device (60) is communicatively connected with the controller (50). The controller (50) is further configured to: respectively acquire the simulation fluid image and the fluid sealed image; perform pore-throat segmentation processing on the simulation fluid image and obtain a first result. The first result includes the pore structure and the throat structure in the simulation fluid image; perform oil-liquid-gas three-phase segmentation processing on the fluid sealed image and obtain a second result. The second result includes the oil-phase image, the liquid-phase image and the gas-phase image in the fluid sealed image; perform bitwise operation processing on the first result and the second result to determine the distribution of the oil phase, the liquid phase and the gas phase in the pore structure and the throat structure.

8. The fluid sequestration simulation device according to any one of claims 1 to 7, characterized in that, The fluid injection mechanism (21) includes a liquid supply pump (211), a liquid supply communication pipe (212) and a fluid storage cylinder (213). The fluid storage cylinder (213) includes a cylinder body (2131) and a piston (2132). The piston (2132) is movably arranged in the cylinder body (2131) and divides the inner cavity of the cylinder body (2131) into a liquid driving cavity (2133) and a fluid storage cavity (2134). The liquid supply pump (211) is communicated with the liquid driving cavity (2133) through the liquid supply communication pipe (212) to drive the piston (2132) to move. The fluid storage cavity (2134) is used for containing simulation fluid or displacement fluid. And the fluid storage cavity (2134) is communicated with the simulation chamber (11) through the fluid injection pipe (22).

9. The fluid sequestration simulation device according to claim 8, wherein The number of the fluid storage cylinders (213) is set to be at least two. At least one of the fluid storage cylinders (213) is used to contain the simulated fluid, and at least one of the fluid storage cylinders (213) is used to contain the displacement fluid. The liquid supply connecting pipe (212) includes a liquid supply main pipe (2121) and a plurality of liquid supply branch pipes (2122). One end of the liquid supply main pipe (2121) is communicated with the liquid supply pump (211), and the other end of the liquid supply main pipe (2121) branches and is communicated with the plurality of liquid supply branch pipes (2122). The number of the liquid supply branch pipes (2122) is the same as the number of the fluid storage cylinders (213) and is correspondingly communicated with the liquid drive chambers (2133) of the plurality of fluid storage cylinders (213) one by one. And a liquid supply switch valve (2123) is respectively arranged on each of the liquid supply branch pipes (2122). One end of the fluid injection pipe (22) far away from the simulation chamber (11) branches and is communicated with the fluid storage chambers (2134) of the plurality of fluid storage cylinders (213).

10. The fluid sequestration simulation device according to claim 8, wherein, The temperature control device (30) further includes a second heating sleeve (32), and the second heating sleeve (32) is arranged on the fluid storage cylinder (213); the temperature control device (30) further includes a first temperature sensor (33) and a second temperature sensor (34). The first temperature sensor (33) is arranged on the fluid storage seat (12) and is used to detect the storage temperature value, and the second temperature sensor (34) is arranged on the fluid storage cylinder (213) and is used to detect the heating temperature value.

Images