A high-temperature and high-pressure multiphase corrosion simulation system and method for a geothermal well cement stone

Abstract

The application provides a geothermal well cement stone high-temperature high-pressure multi-phase corrosion simulation system and method, which comprises a safety isolation chamber, the safety isolation chamber comprises a safety isolation chamber shell, and the space in the safety isolation chamber shell is a sealed space; a double-door interlocking transfer cabin for transferring materials is arranged on the side wall of the safety isolation chamber shell; the application further comprises a high-temperature high-pressure reaction device, which is installed in the sealed space; the high-temperature high-pressure reaction device comprises an open-top kettle body, and a kettle cover is installed on the top of the kettle body; an erosion bin is installed in the kettle body; the erosion bin comprises an open-top bin body, and a bin cover is installed on the top of the bin body; a heating and cooling jacket is arranged between the inner wall of the kettle body and the bin body, and the heating and cooling jacket is fixedly installed on the inner wall. By arranging the safety isolation chamber, multiple safety barriers are constructed, and remote operation is combined, so that the safety of the system is significantly improved. By arranging the erosion bin, the cement stone samples of multiple proportions can be corroded at the same time, and the experimental efficiency is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of geothermal well technology and relates to the simulation and testing of cement stone performance, specifically to a high-temperature and high-pressure multiphase corrosion simulation system and method for geothermal well cement stone. Background Technology

[0002] During the operation of geothermal wells, the long-term stability and durability of the cement stone are key factors in ensuring the safety and integrity of the well. The downhole environment is typically extremely harsh, characterized by high temperature and pressure, and the presence of acidic gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S), as well as corrosive multiphase fluids composed of highly salinized formation water. These factors cause continuous corrosion and damage to the cement stone, affecting its performance and sealing integrity.

[0003] Therefore, accurately simulating real downhole conditions in a laboratory environment to conduct dynamic corrosion and performance evaluation of cement stone samples is crucial for predicting the long-term behavior of cement stone, optimizing cement formulation, and ensuring the safety of geothermal wells throughout their entire life cycle.

[0004] Existing cement stone corrosion equipment typically has the following shortcomings.

[0005] First, there is a lack of safety: the experiment involves high temperatures, high pressures, and highly toxic and flammable hydrogen sulfide gas. A leak would pose a serious threat to personnel and the environment. Existing equipment typically lacks systematic safety isolation and emergency response measures.

[0006] Second, low level of automation: Many operations, such as loading, sealing, parameter setting, process monitoring, and unloading, require manual intervention, which not only increases the risk of personnel being exposed to hazardous environments but also affects the repeatability and efficiency of experiments. 3. Inaccurate simulation environment: It is difficult to fully simulate the dynamic corrosion environment of multiphase fluids coexisting downhole. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a high-temperature and high-pressure multiphase corrosion simulation system and method for geothermal well cement stone, thereby solving the technical problem that the safety and experimental efficiency of existing high-temperature and high-pressure multiphase corrosion simulation systems for cement stone need to be further improved.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0009] A high-temperature, high-pressure, multiphase corrosion simulation system for geothermal well cement stone includes a safety isolation chamber, which includes a safety isolation chamber shell and a sealed space inside the safety isolation chamber shell; the side wall of the safety isolation chamber shell is provided with a double-door interlocked transfer compartment for transferring materials.

[0010] It also includes a high-temperature and high-pressure reaction device, which is installed in the sealed space; the high-temperature and high-pressure reaction device includes a vessel body with an open top, and a vessel lid is installed on the top of the vessel body.

[0011] The vessel body has an internal corrosion chamber; the corrosion chamber includes a top-open chamber body with a chamber cover installed on the top of the chamber body; a heating and cooling jacket is provided between the inner wall of the vessel body and the chamber body, and the heating and cooling jacket is fixedly installed on the inner wall.

[0012] This invention also protects a method for simulating high-temperature and high-pressure multiphase corrosion of cement stone in geothermal wells, which uses the high-temperature and high-pressure multiphase corrosion simulation system for cement stone in geothermal wells as described above.

[0013] Compared with the prior art, the present invention has the following technical effects.

[0014] (I) By setting up a safe isolation room, constructing multiple safety barriers and combining remote operation, the present invention significantly improves the security of the system.

[0015] (II) By setting up a corrosion chamber, the present invention can simultaneously corrode cement stone samples with multiple proportions, which effectively improves the experimental efficiency.

[0016] (III) By setting up a high-temperature and high-pressure reverse device, the present invention can simulate the corrosion environment under the combined action of a single corrosive medium or multiple corrosive media, thereby more accurately observing the corrosion law of cement stone.

[0017] (IV) By setting up a remote central control station, the present invention can centrally control multiple subsystems simultaneously, which is simple and quick to operate, not only improving experimental efficiency, but also realizing a high level of automation.

[0018] (V) This invention sets up an internal waste treatment subsystem to safely and harmlessly treat the high-pressure, toxic, and corrosive waste remaining in the reactor after the experiment, thereby meeting environmental protection requirements.

[0019] (VI) The system of this invention is based on reliable engineering principles and features simple operation and a high degree of automation, enabling it to accurately simulate the dynamic corrosion environment downhole. Furthermore, by isolating experimental personnel from the experimental environment, the system not only ensures the safety of both personnel and the environment but also effectively reduces interference from the external environment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a high-temperature, high-pressure multiphase corrosion simulation system for geothermal well cement stone.

[0021] Figure 2 This is a schematic diagram of the external structure of the vessel.

[0022] Figure 3 This is a schematic diagram of the corrosion chamber and the heating and cooling jacket.

[0023] Figure 4 This is a schematic diagram of the sample holder structure.

[0024] Figure 5 This is a schematic diagram showing the assembly relationship between the sensing and detection subsystem and the compartment cover.

[0025] The meanings of the labels in the diagram are as follows: 1-Safety isolation room, 2-High temperature and high pressure countermeasures device, 3-Remote central control station.

[0026] 101-Safety isolation chamber shell, 102-Sealed space, 103-Double-door interlocked transfer chamber, 104-Negative pressure ventilator and purifier, 105-High-definition camera, 106-Sample robotic arm, 107-Airtight through-wall feed interface, 108-Cover body moving robotic arm.

[0027] 10401 - Exhaust fan, 10402 - Alkali scrubbing tower, 10403 - Electric check valve, 10404 - Micro differential pressure sensor.

[0028] 201-Bottle body, 202-Bottle lid, 203-Automatic quick-opening and locking mechanism for the kettle lid, 204-Corrosion chamber, 205-Heating and cooling jacket, 206-Sample holder, 207-Temperature control subsystem, 208-Multiphase fluid injection and pressure control subsystem, 209-Internal waste treatment subsystem, 210-Sensing and detection subsystem.

[0029] 20401-Blouse body, 20402-Blouse cover, 20403-Blouse cover automatic quick-opening and locking mechanism, 20404-Connecting part, 20405-Pipeline.

[0030] 20501 - Heating coil, 20502 - Cooling coil.

[0031] 20701 - Heating oil inlet flange pipe, 20702 - Heating oil outlet flange pipe, 20703 - Cooling water inlet flange pipe, 20704 - Cooling water outlet flange pipe, 20705 - Thermal oil storage tank, 20706 - Cold water storage tank.

[0032] 20801 - Carbon dioxide storage bottle, 20802 - Hydrogen sulfide storage bottle, 20803 - Corrosive liquid storage tank, 20804 - Hydraulic booster pump.

[0033] 20901 - Waste liquid and waste gas treatment tank; 20902 - Safety valve.

[0034] 301 - Control module, 302 - Human-computer interaction module.

[0035] The specific content of the present invention will be further explained and described in detail below with reference to the embodiments. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, all modules, devices and components in this invention are based on modules, devices and components known in the prior art.

[0037] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0038] Example 1: This embodiment provides a high-temperature, high-pressure, multiphase corrosion simulation system for geothermal well cement stone, such as... Figure 1 As shown, it includes a safety isolation chamber 1, which includes a safety isolation chamber shell 101. The space inside the safety isolation chamber shell 101 is a sealed space 102. The side wall of the safety isolation chamber shell 101 is provided with a double-door interlocked transfer compartment 103 for transferring materials.

[0039] like Figure 2 As shown, it also includes a high-temperature and high-pressure reaction device 2, which is installed in a sealed space 102; the high-temperature and high-pressure reaction device 2 includes a vessel body 201 with an open top, and a vessel cover 202 is installed on the top of the vessel body 201.

[0040] like Figure 3 As shown, a corrosion chamber 204 is installed inside the vessel body 201; the corrosion chamber 204 includes a chamber body 20401 with an open top, and a chamber cover 20402 is installed on the top of the chamber body 20401; a heating and cooling jacket 205 is provided between the inner wall of the vessel body 201 and the chamber body 20401, and the heating and cooling jacket 205 is fixedly installed on the inner wall of the vessel body 201.

[0041] In this embodiment, the safety isolation chamber 1 is a box with good airtightness, which is welded from thick steel plates. The inner surface of the safety isolation chamber 1 is sprayed with an anti-corrosion coating to resist corrosive gases that may be generated due to accidental leakage.

[0042] In this embodiment, the double-door interlocked transfer compartment 103 adopts a commonly known double-door interlocked transfer compartment in the art. The inner and outer doors of the double-door interlocked transfer compartment 103 are electrically interlocked by the control module 301. This interlocking logic ensures that when one door is opened, the other door must be closed and locked. The transfer compartment 12 also has an inert gas nitrogen purging procedure between two door openings.

[0043] As a preferred embodiment of this invention, such as Figure 3 As shown, the silo cover 20402 is connected to the vessel cover 202 via a connecting part 20404 fixedly installed on the top of the silo cover 20402; as Figure 1 As shown, the lid 202 is moved by a lid-moving robotic arm 108 installed inside the safety isolation chamber housing 101.

[0044] In this embodiment, the cover-moving robotic arm 108 adopts a commonly used robotic arm known in the art. The cover-moving robotic arm 108 can lift and move the connected bin cover 20402 and vessel cover 202 together, making room for operation. More preferably, the connecting part 20404 can be selected as a rigid connecting member as needed to achieve a rigid connection between the bin cover 20402 and vessel cover 202, so as to meet the requirement that the cover-moving robotic arm 108 can simultaneously close the bin cover 20402 and vessel cover 202 onto the bin body 20401 and vessel body 201.

[0045] As a preferred embodiment of this invention, such as Figure 2 and Figure 3 As shown, the vessel body 201 and the vessel lid 202 are connected by an automatic quick-opening and locking mechanism 203 for the vessel lid; the silo body 20401 and the silo lid 20402 are connected by an automatic quick-opening and locking mechanism 20403 for the silo lid.

[0046] In this embodiment, the high-temperature and high-pressure reverse device 2 adopts a quick-opening high-temperature and high-pressure reverse device known in the art. The corrosion chamber 204 adopts a quick-opening corrosion chamber commonly known in the art. The automatic quick-opening locking mechanism 203 of the vessel lid and the automatic quick-opening locking mechanism 20403 of the chamber lid both adopt hydraulically driven automatic quick-opening locking mechanisms commonly known in the art. The automatic quick-opening locking mechanism drives the C-shaped clamp or multi-plate locking ring through a high-thrust hydraulic cylinder to apply a uniform and sufficient locking force to the flanges of the vessel lid 202 and the vessel body 201, ensuring reliable sealing.

[0047] As a preferred embodiment of this invention, such as Figure 1 As shown, it also includes a negative pressure ventilator and purifier 104, which keeps the pressure inside the sealed space 102 consistently lower than the external ambient pressure. The negative pressure ventilator and purifier 104 includes an exhaust fan 10401 installed outside the safety isolation chamber shell 101. The air inlet pipe of the exhaust fan 10401 is sealed through the side wall of the safety isolation chamber shell 101 and connected to the sealed space 102. The air outlet pipe of the exhaust fan 10401 is connected to the alkaline scrubbing tower 10402 outside the exhaust fan 10401. An electric check valve 10403 is installed on the air inlet pipe of the exhaust fan 10401. The negative pressure ventilator and purifier 104 also includes a micro differential pressure sensor 10404 installed on the inner side wall of the safety isolation chamber shell 101.

[0048] In this embodiment, the exhaust fan 10401 draws air from the sealed space 102, which can efficiently discharge harmful gases whose density may be lower than that of air; and the extracted gas must be treated by the alkaline scrubbing tower 10402 before being discharged to ensure that the pollutants are removed in accordance with the standards.

[0049] In this embodiment, the alkaline scrubbing tower 10402 adopts a commonly used alkaline scrubbing tower known in the art. The interior of the alkaline scrubbing tower 10402 can be filled with porous packing to increase the contact area between the gas and the liquid; at the same time, it circulates and sprays alkaline solutions such as sodium hydroxide, which can effectively neutralize and absorb acidic gases such as hydrogen sulfide and carbon dioxide, ultimately achieving gas emissions that meet standards.

[0050] In this embodiment, the micro differential pressure sensor 10404 is used to monitor the pressure difference between itself and the external atmosphere in real time. This pressure difference is typically kept stable within a preset negative pressure range. The signal from the micro differential pressure sensor 10404 is transmitted to the control module 301, which uses PID closed-loop control to regulate the speed of the exhaust fan 10401 or the opening of the pipeline valves to maintain a stable negative pressure within the sealed space 102.

[0051] In this embodiment, the electric check valve 10403 is installed on the exhaust manifold of the ventilation system. Its core function is to prevent external air from flowing back into the sealed space 102 and disrupting the stability of the internal environment when the system unexpectedly stops.

[0052] As a preferred embodiment of this invention, such as Figure 1 As shown, the safety isolation chamber 1 is equipped with multiple high-definition cameras 105; the safety isolation chamber 1 is equipped with a sample robotic arm 106.

[0053] In this embodiment, the high-definition camera 105 is a commonly known high-definition camera in the art; the sample robotic arm 106 is a commonly known sample robotic arm in the art. The high-definition camera 105 is used to monitor the state inside the sealed space 102 in real time. The sample robotic arm 106 is used to grasp and transfer the test sample and waste. The sample robotic arm 106 has a large range of motion and flexible operation capability, and its end is equipped with a replaceable gripper, which can adapt to the grasping needs of samples or tools of different shapes and sizes.

[0054] As a preferred embodiment of this invention, such as Figure 4 As shown, a sample holder 206 for placing the test sample is provided inside the corrosion chamber 204, and the sample holder 206 is detachably connected to the inner wall of the corrosion chamber 204. In this embodiment, the sample holder 206 is used to place the test sample.

[0055] As a further solution in this embodiment, such as Figure 1As shown, a temperature control subsystem 207 and a multiphase fluid injection and pressure control subsystem 208 are installed on the vessel body 201; an internal waste treatment subsystem 209 is connected to the drain port of the vessel body 201.

[0056] As a preferred embodiment of this invention, such as Figure 1 As shown, the temperature control subsystem 207 includes a heating oil inlet flange pipe 20701, a heating oil outlet flange pipe 20702, a cooling water inlet flange pipe 20703, and a cooling water outlet flange pipe 20704, all installed on the outer wall of the vessel body 201. The inner ends of the heating oil inlet flange pipe 20701 and the heating oil outlet flange pipe 20702 are sealed and pass through the side wall of the vessel body 201, respectively connecting to both ends of the heating coil 20501 in the heating and cooling jacket 205. The heating oil inlet flange pipe... The outer ends of the heating oil outlet flange pipe 20701 and the heating oil outlet flange pipe 20702 are respectively connected to the heat storage oil tank 20705 through pipes; the inner ends of the cooling water inlet flange pipe 20703 and the cooling water outlet flange pipe 20704 are sealed and pass through the side wall of the vessel body 201 and are respectively connected to the two ends of the cooling coil 20502 in the heating and cooling jacket 205; the outer ends of the cooling water inlet flange pipe 20703 and the cooling water outlet flange pipe 20704 are respectively connected to the cold water storage tank 20706 through pipes.

[0057] In this embodiment, circulation pumps are installed in the thermal oil storage tank 20705 and the cold water storage tank 20706 respectively, and the circulation pumps realize the circulation of oil and water. A heater is provided on the thermal oil storage tank 20705 for heating the oil.

[0058] In this embodiment, high-temperature heat transfer oil is used as the heating medium, and water is used as the cooling medium.

[0059] In this embodiment, the sample robotic arm 107 is mounted on top of the cold water storage tank 20706.

[0060] As a preferred embodiment of this invention, such as Figure 1 As shown, the multiphase fluid injection and pressure control subsystem 208 includes a carbon dioxide storage bottle 20801, a hydrogen sulfide storage bottle 20802, a corrosive liquid storage tank 20803, and a hydraulic booster pump 20804. The carbon dioxide storage bottle 20801 and the hydrogen sulfide storage bottle 20802 are respectively connected to the corrosion chamber 204 through a first pipe that is sealed through the side wall of the vessel body 201. An automatic back pressure regulating valve and a gas flow meter are sequentially installed on the first pipe. The corrosive liquid storage tank 20803 is connected to the corrosion chamber 204 through a second pipe that is sealed through the side wall of the vessel body 201. A check valve and a liquid flow meter are sequentially installed on the second pipe. The hydraulic booster pump 20804 is connected to the corrosion chamber 204 through a third pipe that is sealed through the side wall of the vessel body 201. A gas leakage booster safety valve is installed on the third pipe.

[0061] In this embodiment, the corrosive liquid storage tank 2303 can achieve precise liquid injection with constant flow or constant pressure through a high-pressure horizontal flow pump or a metering pump, thus meeting the experimental requirements for controlling the liquid phase medium.

[0062] In this embodiment, the function of the hydraulic booster pump 20804 is to pressurize the fluid inside the reactor so that the pressure reaches or slightly exceeds the experimental target pressure, thus laying the foundation for subsequent pressure stabilization control.

[0063] As a preferred embodiment of this invention, such as Figure 1 As shown, the internal waste treatment subsystem 209 includes a waste liquid and waste gas treatment tank 20901. The waste liquid and waste gas treatment tank 20901 is sealed through the side wall of the vessel body 201 and communicates with the interior of the corrosion chamber 204 via a pipe equipped with a safety valve 20902. In this embodiment, the waste liquid and waste gas treatment tank 20901 is a commonly used waste liquid and waste gas treatment tank known in the art, used for the harmless treatment of waste discharged from the corrosion chamber 204.

[0064] As a preferred embodiment of this invention, such as Figures 1 to 3 As shown, a sensing and detection subsystem 210 is installed on the vessel lid 202; the sensing and detection subsystem 210 includes a temperature sensor, a pressure sensor, and a liquid level sensor that are sealed through the vessel lid 202 and the bin lid 20402 and extend into the bin 20401.

[0065] In this embodiment, a high-precision temperature sensor, such as a sheathed thermocouple, is used to acquire reaction temperature data in real time and accurately. Its output temperature signal serves as the core feedback basis for PID temperature control. The pressure sensor is the core feedback element for pressure closed-loop control; its accuracy level and range must strictly match the experimental pressure control requirements to ensure accurate and reliable pressure feedback data. The liquid level sensor is used to monitor the liquid level in the corrosion chamber 204 in real time. This data is particularly important for phase ratio control in gas-liquid two-phase experiments and is crucial for ensuring the accuracy of experimental conditions.

[0066] As a preferred embodiment of this invention, such as Figure 1 As shown, an airtight through-wall feed interface 107 is provided on the outer wall of the safety isolation chamber shell 101; the micro differential pressure sensor 10404, electric check valve 10403, high-definition camera 105, sample robotic arm 106 and cover moving robotic arm 108 are all electrically connected to the remote central control station 3 through the airtight through-wall feed interface 107.

[0067] In this embodiment, the airtight through-wall feeder interface 107 is used for electrical connection with the remote central control station 3. The airtight through-wall feeder interface 107 can ensure the sealing of internal and external connections. All power cables, control signal lines, sensor signal lines, and hydraulic oil pipes must be connected through the wall via the corresponding type of feeder interface 15 to avoid sealing failure.

[0068] As a preferred embodiment of this invention, such as Figure 1 As shown, the automatic quick-opening and locking mechanism 203 of the vessel lid and the sensing and detection subsystem 210 are electrically connected to the remote central control station 3 via the airtight through-wall feed interface 107; the automatic quick-opening and locking mechanism 20403 of the silo lid is connected to the airtight through-wall feed interface 107 via a wire that passes through the side wall of the vessel body 201, and is then electrically connected to the remote central control station 3 via the airtight through-wall feed interface 107. In addition, the remote central control station 3 is also electrically connected to all controllable components and sensors of the high-temperature and high-pressure reaction device 2 inside the sealed space 102 via the airtight through-wall feed interface 107, and the specific connection methods all adopt commonly known connection methods in the art.

[0069] In this embodiment, as Figure 1 As shown, the remote central control station 3 is located outside the safety isolation room 1. The remote central control station 3 includes a control module 301 for executing control logic and a human-machine interface module 302 for user operation and information display. The control module 301 adopts a commonly known control module in the art; the human-machine interface module adopts a commonly known human-machine interface module in the art. For example, the control module 301 is a programmable logic controller (PLC) used to execute preset control logic to regulate the operating parameters of the high-temperature and high-pressure reaction device 2; the human-machine interface module 302 is a human-machine interface (HMI) used for users to input test parameters, issue operation commands, and display system operating data and alarm information in real time.

[0070] In this embodiment, the remote central control station 3 is the nerve center of the entire system, responsible for overall equipment control, data processing and safety interlocking, and is the core hub for stable system operation.

[0071] In this embodiment, the control module 301 preferably uses an industrial-grade PLC from brands such as Siemens or Rockwell, which has pre-programmed control logic and safety interlock programs to achieve precise control of the system. The safety interlock program has the highest priority; for example, if the vessel lid is not locked, the program will directly prohibit the initiation of heating and pressurization operations, thus avoiding safety risks from the source.

[0072] In this embodiment, the human-machine interface module 302 is configured as an industrial touchscreen computer. Its HMI interface displays the real-time operating status of all equipment in the system in graphical form, such as process flow diagrams, facilitating intuitive monitoring by operators. Users can conveniently create and save experimental "recipes"—a complete set of experimental process parameters and steps—through the HMI interface, and can also directly call stored recipes, improving experimental efficiency. The HMI also performs data management functions, displaying data curves in real time, tracing historical data curves, and automatically storing data and alarm records, providing a basis for experimental reproduction and troubleshooting.

[0073] Example 2: This embodiment provides a method for simulating high-temperature and high-pressure multiphase corrosion of cement stone in geothermal wells. This method uses the high-temperature and high-pressure multiphase corrosion simulation system for cement stone in geothermal wells given in Embodiment 1.

[0074] The method includes the following steps.

[0075] Step 1: Remote material loading procedure.

[0076] Outside the safety isolation chamber 1, the test sample is placed into the double-door interlocked transfer chamber 103; after the pressure inside the double-door interlocked transfer chamber 103 is balanced with the sealed space 102, the test sample is taken out from the double-door interlocked transfer chamber 103 by the sample robotic arm 106 in the sealed space 102 and placed on the sample holder 206 in the open corrosion chamber 204.

[0077] Step 2, Remote Setup and Startup Procedures.

[0078] On the human-machine interface module 302 of the remote central control station 3, the target temperature, target pressure, amount of corrosive medium injected and test duration parameters are set, and the test program is generated; after confirming that the parameters are correct, the system start command is issued through the control module 301.

[0079] Step 3, Automated Testing Steps.

[0080] According to the start command, under the control of the remote central control station 3, the system uses the cover-moving robotic arm 108 to close the bin cover 20402 onto the bin body 20401, and simultaneously close the vessel cover 202 onto the vessel body 201. Then, the bin cover 20402 is driven down by the automatic quick-opening locking mechanism 20403 to complete the seal between the bin body 20401 and the bin cover 20402; the vessel cover 202 is driven down by the automatic quick-opening locking mechanism 203 to complete the seal between the vessel body 201 and the vessel cover 202. The temperature control subsystem 207 realizes the heating and cooling functions, and the multiphase fluid injection and pressure control subsystem 208 injects corrosive media into the corrosion chamber 204 to jointly establish a high-temperature and high-pressure corrosion environment in the corrosion chamber 204; this environment is maintained for a preset time to conduct dynamic corrosion tests on cement stone.

[0081] Step four, remote monitoring steps.

[0082] During the test, the status of the equipment in the sealed space 102 is monitored in real time by a high-definition camera 105, and the parameters of temperature, pressure and liquid level are collected by the sensing and detection subsystem 210 and displayed in real time on the human-machine interaction module 302.

[0083] Step 5: Automatic post-processing and unloading.

[0084] After the test, the system automatically executes the following: the temperature control subsystem 207 cools down, the multiphase fluid injection and pressure control subsystem 208 depressurizes; the internal waste treatment subsystem 209 performs harmless treatment of the waste in the reactor; the automatic quick-opening locking mechanism 20403 of the bin cover and the automatic quick-opening locking mechanism 203 of the reactor cover are simultaneously unlocked and opened, and the bin cover 20402 and the reactor cover 202 connected together are lifted and moved away from the bin body 20401 and the reactor body 201 by the cover moving robotic arm 108, so as to give the sample robotic arm 106 enough operating space. The sample robotic arm 106 transfers the sample from the sample holder 206 in the corrosion chamber 204 to the double-door interlocked transfer chamber 103; after the double-door interlocked transfer chamber 103 completes pressure balance and purification, the sample is taken out from outside the safety isolation chamber 1.

Claims

1. A high-temperature and high-pressure multiphase corrosion simulation system for geothermal well cement stone, comprising a safety isolation chamber (1), wherein the safety isolation chamber (1) comprises a safety isolation chamber shell (101), and the space inside the safety isolation chamber shell (101) is a sealed space (102); the side wall of the safety isolation chamber shell (101) is provided with a double-door interlocked transfer chamber (103) for transferring materials. It also includes a high temperature and high pressure reverse device (2), which is installed in the sealed space (102); the high temperature and high pressure reverse device (2) includes a top-open vessel body (201), and a vessel cover (202) is installed on the top of the vessel body (201). The vessel body (201) has an internal corrosion chamber (204); the corrosion chamber (204) includes a top-open chamber body (20401) and a chamber cover (20402) installed on the top of the chamber body (20401); a heating and cooling jacket (205) is provided between the inner wall of the vessel body (201) and the chamber body (20401), and the heating and cooling jacket (205) is fixedly installed on the inner wall of the vessel body (201).

2. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 1, characterized in that, The bin cover (20402) is connected to the vessel cover (202) via a connecting part (20404) fixedly installed on the top of the bin cover (20402); the vessel cover (202) is moved by a cover moving robotic arm (108) installed in the housing (101) of the safety isolation chamber.

3. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 1, characterized in that, The vessel body (201) and the vessel lid (202) are connected by an automatic quick-opening and locking mechanism (203) for the vessel lid; the silo body (20401) and the silo lid (20402) are connected by an automatic quick-opening and locking mechanism (20403) for the silo lid.

4. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 1, characterized in that, It also includes a negative pressure ventilation and purification device (104); the negative pressure ventilation and purification device (104) includes an exhaust fan (10401) installed outside the safety isolation chamber shell (101), the air inlet pipe of the exhaust fan (10401) is sealed through the side wall of the safety isolation chamber shell (101) and connected to the sealed space (102), and the air outlet pipe of the exhaust fan (10401) is connected to the alkaline scrubbing tower (10402) outside; an electric check valve (10403) is installed on the air inlet pipe of the exhaust fan (10401); the negative pressure ventilation and purification device (104) also includes a micro differential pressure sensor (10404) installed on the inner side wall of the safety isolation chamber shell (101).

5. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 1, characterized in that, The safety isolation chamber (1) is equipped with multiple high-definition cameras (105); the safety isolation chamber (1) is equipped with a sample robotic arm (106).

6. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 1, characterized in that, The corrosion chamber (204) is provided with a sample holder (206) for placing the test sample, and the sample holder (206) is detachably connected to the inner wall of the corrosion chamber (204). The vessel body (201) is equipped with a temperature control subsystem (207) and a multiphase fluid injection and pressure control subsystem (208); the vessel body (201) is connected to an internal waste treatment subsystem (209) at its drain port.

7. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 6, characterized in that, The temperature control subsystem (207) includes a heating oil inlet flange pipe (20701), a heating oil outlet flange pipe (20702), a cooling water inlet flange pipe (20703), and a cooling water outlet flange pipe (20704) installed on the outer wall of the vessel body (201); the inner ends of the heating oil inlet flange pipe (20701) and the heating oil outlet flange pipe (20702) are sealed through the side wall of the vessel body (201) and connected to the two ends of the heating coil (20501) in the heating and cooling jacket (205) respectively; the heating oil inlet flange pipe The outer ends of (20701) and heating oil outlet flange (20702) are respectively connected to the heat storage oil tank (20705) through pipes; the inner ends of cooling water inlet flange (20703) and cooling water outlet flange (20704) are sealed through the side wall of the vessel body (201) and respectively connected to the two ends of the cooling coil (20502) in the heating and cooling jacket (205); the outer ends of cooling water inlet flange (20703) and cooling water outlet flange (20704) are respectively connected to the cold water storage tank (20706) through pipes; The multiphase fluid injection and pressure control subsystem (208) includes a carbon dioxide storage bottle (20801), a hydrogen sulfide storage bottle (20802), a corrosive liquid storage tank (20803), and a hydraulic booster pump (20804). The carbon dioxide storage bottle (20801) and the hydrogen sulfide storage bottle (20802) are respectively connected to the corrosion chamber (204) through a first pipe that is sealed through the side wall of the vessel body (201). An automatic back pressure regulating valve and a gas flow meter are sequentially installed on the first pipe. The corrosive liquid storage tank (20803) is connected to the corrosion chamber (204) through a second pipe that is sealed through the side wall of the vessel body (201). A check valve and a liquid flow meter are sequentially installed on the second pipe. The hydraulic booster pump (20804) is connected to the corrosion chamber (204) through a third pipe that is sealed through the side wall of the vessel body (201). A gas leakage booster safety valve is installed on the third pipe. The internal waste treatment subsystem (209) includes a waste liquid and waste gas treatment tank (20901), which is sealed through the side wall of the vessel body (201) and connected to the interior of the corrosion chamber (204) via a pipe with a safety valve (20902).

8. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 7, characterized in that, The vessel lid (202) is equipped with a sensing and detection subsystem (210); the sensing and detection subsystem (210) includes a temperature sensor, a pressure sensor and a liquid level sensor that are sealed through the vessel lid (202) and the bin lid (20402) and extend into the bin (20401).

9. The geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in claim 8, characterized in that, An airtight through-wall feed port (107) is provided on the outer wall of the safety isolation chamber shell (101); the micro differential pressure sensor (10404), electric check valve (10403), high-definition camera (105), sample robotic arm (106) and cover moving robotic arm (108) are all electrically connected to the remote central control station (3) through the airtight through-wall feed port (107); the automatic quick-opening locking mechanism (203) of the vessel lid and the sensing and detection subsystem (210) are electrically connected to the remote central control station (3) through the airtight through-wall feed port (107); the automatic quick-opening locking mechanism (20403) of the silo lid is connected to the airtight through-wall feed port (107) through a wire seal passing through the side wall of the vessel body (201), and then electrically connected to the remote central control station (3) through the airtight through-wall feed port (107).

10. A method for simulating high-temperature and high-pressure multiphase corrosion of cement stone in geothermal wells, characterized in that, The method employs the geothermal well cement stone high-temperature and high-pressure multiphase corrosion simulation system as described in any one of claims 1 to 9.

Images