System and method for simulating shale oil in-situ heating well working condition test and waste gas treatment

Abstract

The invention discloses a shale oil in-situ heating well working condition simulation test and waste gas treatment system and method. The system comprises a gas source supply subsystem, a high-temperature and high-pressure test subsystem and a waste gas treatment subsystem. The high-temperature and high-pressure test subsystem comprises a high-temperature and high-pressure reaction kettle, a main control box, an electric control device and a barometer; the barometer is communicated with the high-temperature and high-pressure reaction kettle and is used for monitoring the pressure in the high-temperature and high-pressure reaction kettle; the main control box is electrically connected with the barometer and an electric control device on the high-temperature and high-pressure reaction kettle, and is used for receiving the air pressure in the high-temperature and high-pressure reaction kettle monitored by the barometer and controlling the electric control device to adjust the temperature and pressure in the high-temperature and high-pressure reaction kettle so as to simulate the corrosion environment of the working condition of the shale oil in-situ heating well; the gas source supply subsystem is communicated with the high-temperature and high-pressure reaction kettle of the high-temperature and high-pressure test subsystem and is used for supplying gas to the high-temperature and high-pressure reaction kettle; the waste gas treatment subsystem is communicated with the high-temperature and high-pressure reaction kettle and is used for treating waste gas discharged from the high-temperature and high-pressure reaction kettle.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature and high-pressure corrosion testing, and in particular to a system and method for simulating shale oil in-situ heating well operating condition testing and waste gas treatment. Background Art

[0002] In recent years, global energy consumption has been increasing. Oil shale, as an unconventional energy source, is regarded as an important replacement resource. The traditional open-pit mining of oil shale has serious environmental pollution and large-scale land resource occupation problems. The development and application of underground in-situ conversion heating technology has important practical significance.

[0003] In view of the low maturity of some shale oil resources in the shale layer, the underground in-situ conversion of shale oil is a highly promising development technology. This technology requires heating the formation to 500-650℃, the formation pressure can reach 20-30MPa, and contains a large amount of H2O, CO2, H2S and H2 associated gas, so as to convert the medium and low maturity oil and gas resources into directly usable resources. Since the working conditions of the heating wells for the in-situ conversion technology of shale oil are characterized by high temperature, high pressure and complex associated gas, during the in-situ conversion of shale oil, the harsh corrosive environment (such as high temperature, high pressure, corrosive gases such as H2O, CO2, H2S and H2) in the environment will cause serious corrosion problems of the heating cable. Under actual working conditions, the mechanical properties of the sheath material itself, its mechanical properties and corrosion resistance in the working environment and its mechanical properties after a certain period of service are important criteria for the use of sheath materials. In actual work, it is quite difficult to simulate the in-situ environmental parameters, and the toxic, flammable and explosive gases contained in the test exhaust gas pose environmental pollution and safety hazards. There is still a lack of corresponding solutions, which brings great difficulties to the selection of materials for components. Summary of the invention

[0004] In order to solve the problem of difficulty in conducting experiments in an ultra-high temperature and high pressure shale oil in-situ conversion operating environment, and to absorb and treat harmful exhaust gases, ensure on-site safety, and reduce environmental pollution, a simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system and method are provided in an embodiment of the present invention.

[0005] In a first aspect, an embodiment of the present invention provides a simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system, which may include: a gas source supply subsystem, a high temperature and high pressure test subsystem, and an exhaust gas treatment subsystem;

[0006] The high temperature and high pressure test subsystem may include: a high temperature and high pressure reactor, a main control box, an electronic control device and a pressure gauge; the pressure gauge is connected to the high temperature and high pressure reactor and is used to monitor the pressure inside the reactor of the high temperature and high pressure reactor; the main control box is electrically connected to the pressure gauge and the electronic control device on the high temperature and high pressure reactor, respectively, and is used to receive the pressure inside the reactor of the high temperature and high pressure reactor monitored by the pressure gauge, and control the electronic control device to adjust the temperature and pressure inside the high temperature and high pressure reactor to simulate the corrosive environment of the working conditions of the shale oil in-situ heating well;

[0007] The gas source supply subsystem is connected to the high-temperature and high-pressure reactor of the high-temperature and high-pressure test subsystem, and is used to supply gas to the high-temperature and high-pressure reactor; the exhaust gas treatment subsystem is connected to the high-temperature and high-pressure reactor, and is used to treat the exhaust gas discharged from the high-temperature and high-pressure reactor.

[0008] In one embodiment, the high temperature and high pressure test subsystem may further include: a corundum boat and a honeycomb ceramic tray located in the high temperature and high pressure reactor; the corundum boat is placed above the honeycomb ceramic tray, and the corundum boat is used to load the corrosion test sample to be tested.

[0009] In another embodiment, the high temperature and high pressure reactor may include: a reactor body, a reactor end cover, a reactor bolt and a reactor shell; the reactor body and the reactor end cover are connected by the reactor bolts; the reactor shell is wrapped around the outside of the reactor body; the honeycomb ceramic tray and the corundum burning boat are located in the reactor body;

[0010] The electronic control device may include: a heating resistor group, an in-kettle thermocouple and a kettle wall thermocouple; the heating resistor group is located between the reactor body and the reactor shell, and is used to heat the reactor body based on the control instructions of the main control box; the in-kettle thermocouple is located inside the reactor body, and is used to monitor the temperature inside the reactor body and feed back to the main control box; the kettle wall thermocouple is used to monitor the temperature of the reactor wall and feed back to the main control box.

[0011] In another embodiment, the high temperature and high pressure test subsystem may further include: a hydraulic pump with a lifting arm, wherein the lifting arm of the hydraulic pump is connected to the reactor end cover, and the lifting arm is driven by the hydraulic pump to drive the reactor end cover to move.

[0012] In another embodiment, the gas source supply subsystem may include: an ultrapure nitrogen tank and a mixed gas source tank, wherein the ultrapure nitrogen tank and the mixed gas source tank are respectively connected to the high temperature and high pressure reactor;

[0013] A three-way valve and a first gas valve are sequentially arranged on the first pipeline between the ultrapure nitrogen tank, the mixed gas source tank and the high-temperature and high-pressure reactor; a first pressure reducing valve is arranged on the first pipeline between the ultrapure nitrogen tank and the three-way valve; and a second pressure reducing valve is arranged on the first pipeline between the mixed gas source tank and the three-way valve.

[0014] In another embodiment, the waste gas treatment subsystem may include: a first alkali liquid tank, a second alkali liquid tank and a circulating cooler;

[0015] The first alkali liquid tank is connected to the reactor end cover of the high-temperature and high-pressure reactor through a second pipeline; a flow meter and a second gas valve are provided on the second pipeline; the first alkali liquid tank and the second alkali liquid tank are connected through a third pipeline; the second alkali liquid tank is connected to an external fourth pipeline, and a hydrogen concentration monitoring meter and a third gas valve are provided on the fourth pipeline; the second alkali liquid tank is connected to an acid-base detection meter; the circulating cooler is connected to the outer layer of the first alkali liquid tank.

[0016] In another embodiment, the circulating cooler is provided with a start button, a stop button, a temperature display, a flow display and a flow adjustment knob; the start button and the stop button are used to start and stop the circulating cooler, the temperature display and the flow display are used to monitor the circulation parameters of the coolant in the circulating cooler, and the flow adjustment knob is used to regulate the flow rate of the coolant.

[0017] In another embodiment, the main control box is provided with a kettle temperature display, a kettle wall temperature display, a kettle pressure display, a heating voltage meter, a touch screen, a heating start button and a heating stop button;

[0018] The touch operation screen is used to set the test temperature, heating voltage and test time of the high-temperature and high-pressure reactor; the temperature display inside the reactor is used to monitor the temperature inside the reactor of the high-temperature and high-pressure reactor in real time, the temperature display inside the reactor wall is used to monitor the temperature of the reactor wall of the high-temperature and high-pressure reactor in real time, the heating voltage meter is used to monitor the voltage of the heating resistor group on the high-temperature and high-pressure reactor in real time, and the pressure display inside the reactor is used to monitor and display the pressure inside the reactor of the high-temperature and high-pressure reactor in real time through the barometer; the heating start button and the heating stop button are used to control the start and stop of the main control box.

[0019] In a second aspect, an embodiment of the present invention provides a method for simulating a shale oil in-situ heating well operating condition test and exhaust gas treatment. The simulation test and exhaust gas treatment are performed according to the simulating shale oil in-situ heating well operating condition test and exhaust gas treatment system described in the first aspect, and may include:

[0020] The corrosion test sample to be tested is placed into a high-temperature and high-pressure reactor of the high-temperature and high-pressure test subsystem, and a certain amount of deionized water is injected into the high-temperature and high-pressure reactor, and then the high-temperature and high-pressure reactor is sealed;

[0021] Open the gas source supply subsystem to inject high-purity nitrogen into the high-temperature and high-pressure reactor to displace the air in the high-temperature and high-pressure reactor and the pipeline; then inject a mixed gas of carbon dioxide, hydrogen sulfide and hydrogen into the high-temperature and high-pressure reactor, monitor the air pressure in the reactor of the high-temperature and high-pressure reactor in real time through the main control box and the pressure gauge of the high-temperature and high-pressure test subsystem, and close the gas source supply subsystem after the air pressure in the reactor reaches the set value;

[0022] The test temperature, heating voltage and test time in the high temperature and high pressure reactor are set based on the main control box, and the heating resistor group in the high temperature and high pressure test subsystem electric control device is turned on until the temperature is stable and then the test is started;

[0023] The temperature inside the reactor, the temperature of the reactor wall, the gas pressure inside the reactor and the heating voltage of the high-temperature and high-pressure reactor are monitored and recorded in real time by the main control box and the electronic control device;

[0024] After the set test time is reached, the main control box controls the heating resistor group to stop running and turns on the exhaust gas treatment subsystem to treat the exhaust gas;

[0025] After the main control box monitors that there is no pressure in the high-temperature and high-pressure reactor, all valves of the system and the circulating cooler of the exhaust gas treatment subsystem are closed, and the corrosion test sample to be tested is taken out to end the test.

[0026] In another embodiment, the simulated shale oil in-situ heating well operating condition test and the waste gas treatment method may specifically include:

[0027] The reactor end cover of the high-temperature and high-pressure reactor is opened by using the hydraulic pump of the high-temperature and high-pressure test subsystem, and the corrosion test sample to be tested is loaded into the corundum boat of the high-temperature and high-pressure test subsystem, and the corundum boat is placed on the honeycomb ceramic tray of the high-temperature and high-pressure test subsystem, and then the corundum boat and the honeycomb ceramic tray are loaded into the reactor body of the high-temperature and high-pressure reactor; after a certain amount of deionized water is injected into the reactor body, the reactor end cover is lowered by using the hydraulic pump, and the reactor end cover of the high-temperature and high-pressure reactor is fixed to the reactor body by using the reactor bolts of the high-temperature and high-pressure reactor, so that the high-temperature and high-pressure reactor is closed;

[0028] Open the ultrapure nitrogen tank, the first gas valve and the first pressure reducing valve of the gas source supply subsystem, and open the second gas valve and the third gas valve of the exhaust gas treatment subsystem, adjust the three-way valve of the gas source supply subsystem according to the flow meter of the exhaust gas treatment subsystem, and continuously inject ultrapure nitrogen into the high-temperature and high-pressure reactor to exhaust the air in the high-temperature and high-pressure reactor and the pipeline; after continuously injecting ultrapure nitrogen for 2 hours, close the ultrapure nitrogen tank and the first pressure reducing valve, and after monitoring that there is no pressure in the high-temperature and high-pressure reactor according to the pressure gauge of the main control box and the high-temperature and high-pressure test subsystem, close the second gas valve and the third gas valve;

[0029] Open the mixed gas source tank and the second pressure reducing valve of the gas source supply subsystem, inject a mixed gas of carbon dioxide, hydrogen sulfide and hydrogen into the high-temperature and high-pressure reactor, monitor the gas pressure in the reactor of the high-temperature and high-pressure reactor in real time through the main control box and the pressure gauge, and close the mixed gas source tank, the second pressure reducing valve, the three-way valve and the first gas valve after the gas pressure in the reactor reaches the set value;

[0030] The test temperature, heating voltage and test time in the high temperature and high pressure reactor are set based on the touch screen of the main control box, and the heating resistor group is turned on until the temperature is stable before starting the test;

[0031] The temperature inside the high-temperature and high-pressure reactor is monitored in real time by the in-reactor thermocouple in the electric control device, and is recorded in real time by the main control box; the temperature of the reactor wall of the high-temperature and high-pressure reactor is monitored in real time by the in-reactor thermocouple in the electric control device, and is recorded in real time by the main control box; the air pressure inside the reactor of the high-temperature and high-pressure reactor is monitored in real time by the barometer, and is recorded in real time by the main control box; the heating voltage of the high-temperature and high-pressure reactor is monitored in real time by the heating voltage meter on the main control box, and is recorded in real time by the main control box;

[0032] After the set test time is reached, the main control box controls the heating resistor group to stop running, turns on the circulating cooler of the exhaust gas treatment subsystem, and adjusts the circulation parameters of the coolant in the circulating cooler to be normal;

[0033] After the temperature in the high-temperature and high-pressure reactor drops to 70°C, the second gas valve is opened, and the rate of discharge into the first alkali liquid tank in the waste gas treatment subsystem is adjusted according to the flow meter; after the gas is discharged into the second alkali liquid tank in the waste gas treatment subsystem, it is judged whether the acidic gas in the mixed gas is completely removed according to the acid-base detection table in the waste gas treatment subsystem; and then it is judged whether the hydrogen concentration in the mixed gas is appropriate according to the hydrogen concentration monitoring table in the waste gas treatment subsystem. After the hydrogen concentration is appropriate, the third gas valve is opened to discharge the harmless waste gas into the atmosphere;

[0034] After the main control box monitors that there is no pressure in the high-temperature and high-pressure reactor, all valves of the system and the circulating cooler of the exhaust gas treatment subsystem are closed; the bolts of the reactor are unscrewed, the port of the reactor is raised using the hydraulic pump, and the corrosion test sample is taken out to end the test.

[0035] The beneficial effects of the above technical solution provided in the embodiments of the present invention include at least:

[0036] In the embodiment of the present invention, a system and method for simulating the working condition test of shale oil in-situ heating well and waste gas treatment are provided. The system can visually monitor and control the key parameters of the test under the working condition of high temperature and high pressure shale oil in-situ heating well, and is equipped with a safety alarm function, so that the corrosion test of simulating the working condition of shale oil in-situ heating well can be carried out safely and accurately, and has the characteristics of reasonable setting, good safety, high practicality, etc. Further, the system solves the problem of difficulty in carrying out tests in the working condition environment of ultra-high temperature and high pressure shale oil in-situ conversion, and absorbs and treats harmful waste gas to ensure on-site safety and reduce environmental pollution.

[0037] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0038] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 A structural diagram of a simulated shale oil in-situ heating well operating condition test and an exhaust gas treatment system provided in an embodiment of the present invention;

[0041] Figure 2 A structural diagram of a high-temperature and high-pressure reactor provided in an embodiment of the present invention;

[0042] Among them, 1-gas supply subsystem; 2-high temperature and high pressure test subsystem; 3-waste gas treatment subsystem;

[0043] 11-ultrapure nitrogen tank; 12-mixed gas source tank; 13-first pipeline; 14-three-way valve; 15-first gas valve; 16-first pressure reducing valve; 17-second pressure reducing valve;

[0044] 21-high temperature and high pressure reactor; 22-main control box; 23-electronic control device; 24-barometer; 25-corundum burning boat; 26-honeycomb ceramic tray; 27-hydraulic pump;

[0045] 211-reactor body; 212-reactor end cover; 213-reactor bolt; 214-reactor shell;

[0046] 221-kettle internal temperature display; 222-kettle wall temperature display; 223-kettle internal pressure display; 224-heating voltage meter; 225-touch operation screen; 226-heating start button; 227-heating stop button;

[0047] 231-heating resistor group; 232-thermocouple in the kettle; 233-thermocouple on the kettle wall; 271-crane arm;

[0048] 301-first alkali liquid tank; 302-second alkali liquid tank; 303-circulating cooler; 304-second pipeline; 305-flow meter; 306-second gas valve; 307-third pipeline; 308-fourth pipeline; 309-hydrogen concentration detection meter; 310-third gas valve; 311-acid-base detection meter; 3011-box outer layer; 3031-start button; 3032-stop button; 3033-temperature display; 3034-flow display; 3035-flow adjustment knob. DETAILED DESCRIPTION

[0049] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0050] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "far", "near", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In order to solve the problem of difficulty in conducting experiments in an ultra-high temperature and high pressure shale oil in-situ conversion operating environment, and to absorb and treat harmful exhaust gases, ensure on-site safety, and reduce environmental pollution, a simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system and method are provided in an embodiment of the present invention.

[0053] The embodiment of the present invention provides a simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system, referring to Figure 1 As shown, the system may include: a gas source supply subsystem 1, a high temperature and high pressure test subsystem 2 and a waste gas treatment subsystem 3; the high temperature and high pressure test subsystem 2 may include: a high temperature and high pressure reactor 21, a main control box 22, an electronic control device 23 and a barometer 24; the barometer 24 is connected to the high temperature and high pressure reactor 21, and is used to monitor the pressure inside the reactor of the high temperature and high pressure reactor 21; the main control box 22 is electrically connected to the barometer 24 and the electronic control device 23 on the high temperature and high pressure reactor 21, respectively, and is used to receive the pressure inside the reactor of the high temperature and high pressure reactor 21 monitored by the barometer 24, and control the electronic control device 23 to adjust the temperature and pressure inside the high temperature and high pressure reactor 21 to simulate the corrosive environment of the shale oil in-situ heating well working conditions; the gas source supply subsystem 1 is connected to the high temperature and high pressure reactor 21 of the high temperature and high pressure test subsystem 2, and is used to supply gas to the high temperature and high pressure reactor 21; the waste gas treatment subsystem 3 is connected to the high temperature and high pressure reactor 21, and is used to treat the waste gas discharged from the high temperature and high pressure reactor 21.

[0054] The high-temperature and high-pressure reactor in this embodiment is connected to the gas source supply subsystem through an air intake pipeline, and is connected to the exhaust gas treatment subsystem through an exhaust pipeline. In specific implementation, pipeline holes can be reserved on the reactor end cover of the high-temperature and high-pressure reactor to lay the air intake pipeline and the exhaust pipeline.

[0055] The above-mentioned simulated shale oil in-situ heating well working condition test and waste gas treatment system provided in the embodiment of the present invention can visually monitor and control the key parameters of the test under the high temperature and high pressure simulated shale oil in-situ heating well working condition, and is equipped with a safety alarm function, so that the corrosion test under the simulated shale oil in-situ heating well working condition can be carried out safely and accurately, and has the characteristics of reasonable setting, good safety, high practicality, etc. Further, the system solves the problem of difficulty in carrying out tests in the ultra-high temperature and high pressure shale oil in-situ conversion working condition environment, and absorbs and treats harmful waste gas to ensure on-site safety and reduce environmental pollution.

[0056] In an optional embodiment, in order to achieve uniform distribution of the tested corrosion test samples, that is, to accurately simulate the environment under the shale oil in-situ heating well working conditions. Figure 1 and Figure 2 As shown, the high temperature and high pressure test subsystem 2 may further include: a corundum burning boat 25 and a honeycomb ceramic tray 26 located in the high temperature and high pressure reactor 21; the corundum burning boat 25 is placed above the honeycomb ceramic tray 26, and the corundum burning boat 25 is used to load the corrosion test sample to be tested. In this embodiment, the corrosion test sample to be tested is loaded into the corundum burning boat, so that the corrosion test sample to be tested is no longer in contact with the inner wall of the high temperature and high pressure reactor. In order to prevent the corundum burning boat from being stably placed in the high temperature and high pressure reactor, a honeycomb ceramic tray is added to provide a flat placement surface for the corundum burning boat, thereby avoiding the problem that the corundum burning boat cannot be stably placed due to the uneven bottom of the high temperature and high pressure reactor.

[0057] In an alternative embodiment, referring to Figure 1 and Figure 2 As shown, the high temperature and high pressure reactor 21 may include: a reactor body 211, a reactor end cover 212, a reactor bolt 213 and a reactor shell 214; the reactor body 211 and the reactor end cover 212 are connected by the reactor bolt 213; the reactor shell 214 is wrapped around the outside of the reactor body 211; the honeycomb ceramic tray 26 and the corundum boat 25 are located in the reactor body 211; the electric control device 23 may include: a heating resistor group 231, a thermocouple 232 in the reactor and a thermocouple 233 on the reactor wall; the heating resistor group 231 is located between the reactor body 211 and the reactor shell 214, and is used to heat the reactor body 211 based on the control instruction of the main control box 22; the thermocouple 232 in the reactor is located inside the reactor body 211, and is used to monitor the temperature inside the reactor body 211 and feed it back to the main control box 22; the thermocouple 233 on the reactor wall is used to monitor the temperature of the reactor wall and feed it back to the main control box 22.

[0058] The reactor body and the reactor end cover in this embodiment are connected by reactor bolts to ensure the air tightness of the reactor body under high pressure. The reactor end cover can be provided with a pipe sleeve for inserting the thermocouple in the reactor. The high-temperature and high-pressure reactor in this embodiment can achieve precise adjustment of the pressure and temperature in the reactor cavity. The upper limit of the pressure is 30MPa, the accuracy is 0.01MPa, and the upper limit of the temperature in the reactor and the reactor wall is 700℃, with an accuracy of 0.1℃. The above-mentioned electronic control device in the embodiment of the present invention can visually monitor and control the key parameters of the test, so as to safely and accurately carry out corrosion tests simulating the working conditions of shale oil in-situ heating wells.

[0059] In an alternative embodiment, referring to Figure 1 and Figure 2 As shown, the high temperature and high pressure test subsystem 2 may further include: a hydraulic pump 27 with a lifting arm 271, the lifting arm 271 of the hydraulic pump 27 is connected to the reactor end cover 212, and the lifting arm 271 is driven by the hydraulic pump 27 to drive the reactor end cover 212 to move. The above-mentioned hydraulic pump in the embodiment of the present invention can be used as a lifting device to move the reactor end cover of the high temperature and high pressure reactor, avoiding improper human operation and saving a lot of manpower, and the operation of the hydraulic pump is safer and more convenient.

[0060] In an alternative embodiment, referring to Figure 1 and Figure 2 As shown, the gas source supply subsystem 1 may include: an ultrapure nitrogen tank 11 and a mixed gas source tank 12, the ultrapure nitrogen tank 11 and the mixed gas source tank 12 are respectively connected to the high temperature and high pressure reactor 21; a three-way valve 14 and a first gas valve 15 (intake valve) are sequentially arranged on the first pipeline 13 (intake pipeline) between the ultrapure nitrogen tank 11, the mixed gas source tank 12 and the high temperature and high pressure reactor 21; a first pressure reducing valve 16 is arranged on the first pipeline 13 between the ultrapure nitrogen tank 11 and the three-way valve 14; a second pressure reducing valve 17 is arranged on the first pipeline 13 between the mixed gas source tank 12 and the three-way valve 14. The ultrapure nitrogen tank in the embodiment of the present invention is used to displace the residual air in the system to avoid residual oxygen and fail to simulate the actual working conditions of the shale oil in-situ heating well, and the mixed gas is injected through the mixed gas source tank to simulate the downhole working conditions of the shale oil in-situ heating well together with the deionized water pre-injected into the high temperature and high pressure reactor at high temperature and high pressure.

[0061] In an alternative embodiment, referring to Figure 1 and Figure 2As shown, the waste gas treatment subsystem 3 may include: a first alkali liquid tank 301, a second alkali liquid tank 302 and a circulating cooler 303; the first alkali liquid tank 301 and the reactor end cover 212 of the high-temperature and high-pressure reactor 21 are connected through a second pipeline 304 (exhaust pipeline); a flow meter 305 and a second gas valve 306 (exhaust valve) are provided on the second pipeline 304; the first alkali liquid tank 301 and the second alkali liquid tank 302 are connected through a third pipeline 307 (exhaust pipeline); the second alkali liquid tank 302 is connected to an external fourth pipeline 308 (exhaust pipeline), and the fourth pipeline 308 is provided with a hydrogen concentration monitoring meter and a third gas valve 310 (exhaust valve); the second alkali liquid tank 302 is connected to an acid-base detection meter 311; the circulating cooler 303 is connected to the outer layer 3011 of the first alkali liquid tank 301.

[0062] The above-mentioned waste gas treatment subsystem in the embodiment of the present invention can completely remove harmful acidic gases (H2S, CO2, etc.) through the secondary alkali liquid tank, and ensure that the hydrogen concentration of the waste gas is in a safe range through the hydrogen concentration monitoring meter, so as to effectively treat the waste gas and be environmentally friendly.

[0063] In an alternative embodiment, referring to Figure 1 and Figure 2 As shown, the circulating cooler 303 may be provided with a start button 3031, a stop button 3032, a temperature display 3033, a flow display 3034 and a flow adjustment knob 3035; the start button 3031 and the stop button 3032 are used to start and stop the circulating cooler 303, the temperature display 3033 and the flow display 3034 are used to monitor the circulation parameters of the coolant in the circulating cooler 303, and the flow adjustment knob 3035 is used to control the flow rate of the coolant. The above-mentioned circulating cooler in this embodiment provides the system with coolant, which can simulate the necessary experimental support for the exhaust gas cooling process.

[0064] In an alternative embodiment, referring to Figure 1 and Figure 2As shown, the main control box 22 may be provided with a kettle temperature display 221, a kettle wall temperature display 222, a kettle pressure display 223, a heating voltage meter 224, a touch screen 225, a heating start button 226 and a heating stop button 227; the touch screen 225 is used to set the test temperature, heating voltage and test time of the high-temperature and high-pressure reactor 21; the kettle temperature display 221 is used to monitor the kettle temperature of the high-temperature and high-pressure reactor 21 in real time, the kettle wall temperature display 222 is used to monitor the kettle wall temperature of the high-temperature and high-pressure reactor 21 in real time, the heating voltage meter 224 is used to monitor the voltage of the heating resistor group 231 on the high-temperature and high-pressure reactor 21 in real time, and the kettle pressure display 223 is used to monitor and display the kettle pressure of the high-temperature and high-pressure reactor 21 in real time through the barometer 24; the heating start button 226 and the heating stop button 227 are used to control the start and stop of the main control box 22. The main control box in this embodiment serves as the main equipment for monitoring and controlling test parameters in the simulated shale oil in-situ heating well operating condition test. The main control box can be used to check and adjust test parameters in a timely manner, providing a control basis for the simulated shale oil in-situ heating well operating condition test.

[0065] The above-mentioned simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system provided in the embodiments of the present invention can meet the needs of conducting corrosion tests on samples under simulated shale oil in-situ heating well operating conditions. At the same time, important test parameters such as temperature and pressure can be recorded and controlled during the test, and it can ensure that the test exhaust gas is clean and harmless and can be discharged into the atmosphere safely and environmentally friendly.

[0066] Based on the same inventive concept, an embodiment of the present invention further provides a method for simulating a shale oil in-situ heating well operating condition test and exhaust gas treatment. The method performs a simulation test and exhaust gas treatment according to the above-mentioned simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system, and specifically may include the following steps:

[0067] Step (1), loading the corrosion test sample into the high temperature and high pressure reactor 21 of the high temperature and high pressure test subsystem 2, injecting a certain amount of deionized water into the high temperature and high pressure reactor 21, and then sealing the high temperature and high pressure reactor 21.

[0068] During the specific implementation of this step, the hydraulic pump 27 of the high-temperature and high-pressure test subsystem 2 is used to open the reactor end cover 212 of the high-temperature and high-pressure reactor 21, and the corrosion test sample to be tested is loaded into the corundum boat 25 of the high-temperature and high-pressure test subsystem 2. After the corundum boat 25 is placed on the honeycomb ceramic tray 26 of the high-temperature and high-pressure test subsystem 2, the corundum boat 25 and the honeycomb ceramic tray 26 are loaded into the reactor body of the high-temperature and high-pressure reactor 21; after a certain amount of deionized water is injected into the reactor body, the hydraulic pump 27 is used to lower the reactor end cover 212, and the reactor bolts 213 of the high-temperature and high-pressure reactor 21 are used to fix the reactor end cover 212 on the reactor body, so that the high-temperature and high-pressure reactor 21 is closed.

[0069] Before adding the quantitative deionized water in the embodiment of the present invention to the high-temperature and high-pressure reactor, high-purity nitrogen can be continuously introduced for 24 hours to remove oxygen in the deionized water; the specific content of the above deionized water can be calculated and derived based on the water vapor content in the formation, and the deionized water forms water vapor under the heating condition of the high-temperature and high-pressure reactor to simulate the water vapor in the corrosive environment under the actual working condition of the shale oil in-situ heating well. In this embodiment, the bolts of the reactor are tightened step by step in the diagonal cross direction, and then tightened clockwise for one turn, and after confirming that all bolts are at the same pre-tightening force, the high-temperature and high-pressure reactor is completely sealed.

[0070] Step (2), open the gas source supply subsystem to inject high-purity nitrogen into the high-temperature and high-pressure reactor 21 to displace the air in the high-temperature and high-pressure reactor 21 and the pipeline; then inject a mixture of carbon dioxide, hydrogen sulfide and hydrogen into the high-temperature and high-pressure reactor 21, and monitor the air pressure in the reactor of the high-temperature and high-pressure reactor 21 in real time through the main control box 22 and the pressure gauge 24 of the high-temperature and high-pressure test subsystem 2. After the air pressure in the reactor reaches the set value, close the gas source supply subsystem.

[0071] In the specific implementation of this step, first, the ultrapure nitrogen tank 11, the first gas valve 15 and the first pressure reducing valve 16 of the gas source supply subsystem are opened, and the second gas valve 306 and the third gas valve 310 of the exhaust gas treatment subsystem 3 are opened, and the three-way valve 14 of the gas source supply subsystem is adjusted according to the flow meter 305 of the exhaust gas treatment subsystem 3, and ultrapure nitrogen is continuously injected into the high-temperature and high-pressure reactor 21 to exhaust the air in the high-temperature and high-pressure reactor 21 and the pipeline; after continuously injecting ultrapure nitrogen for 2 hours, the ultrapure nitrogen tank 11 and the first pressure reducing valve 16 are closed, and the flow meter 305 of the exhaust gas treatment subsystem 3 is adjusted according to the flow meter 305 of the exhaust gas treatment subsystem 3. 2 and the barometer 24 of the high-temperature and high-pressure test subsystem 2 monitor that there is no pressure in the high-temperature and high-pressure reactor 21, then close the second gas valve 306 and the third gas valve 310; then, open the mixed gas source tank 12 and the second pressure reducing valve 17 of the gas source supply subsystem, inject a mixed gas of carbon dioxide, hydrogen sulfide and hydrogen into the high-temperature and high-pressure reactor 21, monitor the air pressure in the reactor of the high-temperature and high-pressure reactor 21 in real time through the main control box 22 and the barometer 24, and close the mixed gas source tank 12, the second pressure reducing valve 17, the three-way valve 14 and the first gas valve 15 after the air pressure in the reactor reaches the set value.

[0072] In this step, the mixed gas source tank is closed after the air pressure in the kettle reaches the set value, wherein the set value is the content of the CO2-H2S-H2 mixed gas in the formation under the simulated shale oil in-situ heating well working condition, and the content of the CO2-H2S-H2 mixed gas injected into the high-temperature and high-pressure reactor is calculated by the air pressure value. In the embodiment of the present invention, the inventor calculated that when the pressure in the kettle reaches 1.3MPa (calculated according to the ideal gas state equation), the temperature and pressure conditions in the kettle of the high-temperature and high-pressure reactor can be guaranteed to be 600°C and 12.82Mpa during subsequent temperature and pressure increase, which meets the actual working conditions downhole.

[0073] Step (3), based on the main control box 22, set the test temperature, heating voltage and test time in the high temperature and high pressure reactor 21, turn on the heating resistor group 231 in the high temperature and high pressure test subsystem 2 electronic control device 23 until the temperature stabilizes and then start the test.

[0074] In the specific implementation of this step, the test temperature, heating voltage and test time in the high temperature and high pressure reactor 21 are set based on the touch screen 225 of the main control box 22, and the heating resistor group 231 is turned on until the temperature stabilizes and then the test is started. In this step, the high temperature and high pressure reactor is heated to 600°C. Since the content of the above-mentioned CO2-H2S-H2 mixed gas and the content of deionized water are pre-calculated, the pressure in the reactor of the high temperature and high pressure reactor can be 12.82Mpa, which meets the corrosive environment of the actual working conditions underground.

[0075] Step (4), the temperature inside the high-temperature and high-pressure reactor 21, the reactor wall temperature, the gas pressure inside the reactor and the heating voltage are monitored and recorded in real time through the main control box 22 and the electronic control device 23.

[0076] During the specific implementation of this step, the temperature inside the kettle of the high-temperature and high-pressure reactor 21 is monitored in real time by the kettle thermocouple 232 in the electric control device 23, and is recorded in real time by the main control box 22; the kettle wall temperature of the high-temperature and high-pressure reactor 21 is monitored in real time by the kettle wall thermocouple 233 in the electric control device 23, and is recorded in real time by the main control box 22; the air pressure inside the kettle of the high-temperature and high-pressure reactor 21 is monitored in real time by the barometer 24, and is recorded in real time by the main control box 22; the heating voltage of the high-temperature and high-pressure reactor 21 is monitored in real time by the heating voltage meter 224 on the main control box 22, and is recorded in real time by the main control box 22.

[0077] Step (5), after the set test time is reached, the main control box 22 controls the heating resistor group 231 to stop running and opens the exhaust gas treatment subsystem 3 to treat the exhaust gas.

[0078] When this step is implemented, first, after the set test time is reached, the main control box 22 controls the heating resistor group 231 to stop running, turns on the circulating cooler 303 of the waste gas treatment subsystem 3, and adjusts the circulation parameters of the coolant in the circulating cooler 303 to be normal; then, after the temperature in the high-temperature and high-pressure reactor 21 drops to 70°C, the second gas valve 306 is opened, and the rate of discharge into the first alkali liquid tank 301 in the waste gas treatment subsystem 3 is adjusted according to the flow meter 305; after the gas is discharged into the second alkali liquid tank 302 in the waste gas treatment subsystem 3, it is determined whether the acidic gas in the mixed gas is completely removed according to the acid-base detection table 311 in the waste gas treatment subsystem 3; then, it is determined whether the hydrogen concentration in the mixed gas is appropriate according to the hydrogen concentration monitoring table in the waste gas treatment subsystem 3, and after the hydrogen concentration is appropriate, the third gas valve 310 is opened to discharge the harmless waste gas into the atmosphere. It should be noted that if the hydrogen concentration is too high, it is flammable and explosive, and the hydrogen flow rate is reduced by adjusting the discharge flow to reduce the hydrogen concentration.

[0079] Step (6), after the main control box 22 monitors that there is no pressure in the high-temperature and high-pressure reactor 21, all valves of the system and the circulating cooler 303 of the exhaust gas treatment subsystem 3 are closed, and the corrosion test sample to be tested is taken out and the test is completed.

[0080] During the specific implementation of this step, after the main control box 22 monitors that there is no pressure in the high-temperature and high-pressure reactor 21, all valves of the system and the circulating cooler 303 of the exhaust gas treatment subsystem 3 are closed; the reactor bolts 213 are unscrewed, and the reactor port is raised using the hydraulic pump 27, and the corrosion test sample to be tested is taken out to end the test.

[0081] The detailed introduction and beneficial effects of the above-mentioned simulated shale oil in-situ heating well operating condition test and exhaust gas treatment method provided in the embodiments of the present invention can be referred to the relevant introduction of the above-mentioned simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system, and the embodiments of the present invention will not be repeated here.

[0082] Obviously, various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various changes and modifications may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims. Thus, if these changes and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A simulated shale oil in-situ heating well operating condition test and exhaust gas treatment system, characterized in that: include: Gas supply subsystem, high temperature and high pressure test subsystem and waste gas treatment subsystem; The high temperature and high pressure test subsystem includes: a high temperature and high pressure reactor, a main control box, an electronic control device and a pressure gauge; The barometer is connected to the high-temperature and high-pressure reactor and is used to monitor the pressure inside the high-temperature and high-pressure reactor; the main control box is electrically connected to the barometer and the electronic control device on the high-temperature and high-pressure reactor, respectively, and is used to receive the air pressure inside the high-temperature and high-pressure reactor monitored by the barometer, and control the electronic control device to adjust the temperature and pressure inside the high-temperature and high-pressure reactor to simulate the corrosive environment of the shale oil in-situ heating well working conditions; The gas source supply subsystem is connected to the high-temperature and high-pressure reactor of the high-temperature and high-pressure test subsystem, and is used to supply gas to the high-temperature and high-pressure reactor; the exhaust gas treatment subsystem is connected to the high-temperature and high-pressure reactor, and is used to treat the exhaust gas discharged from the high-temperature and high-pressure reactor.

2. The system according to claim 1, characterized in that The high temperature and high pressure test subsystem also includes: a corundum firing boat and a honeycomb ceramic tray located in the high temperature and high pressure reactor; the corundum firing boat is placed above the honeycomb ceramic tray, and the corundum firing boat is used to load the corrosion test sample to be tested.

3. The system according to claim 2, characterized in that The high-temperature and high-pressure reactor comprises: a reactor body, a reactor end cover, reactor bolts and a reactor shell; the reactor body and the reactor end cover are connected by the reactor bolts; the reactor shell is wrapped around the outside of the reactor body; the honeycomb ceramic tray and the corundum burning boat are located in the reactor body; The electronic control device includes: a heating resistor group, an in-kettle thermocouple and a kettle wall thermocouple; the heating resistor group is located between the reactor body and the reactor shell, and is used to heat the reactor body based on the control instructions of the main control box; the in-kettle thermocouple is located inside the reactor body, and is used to monitor the temperature inside the reactor body and feed back to the main control box; the kettle wall thermocouple is used to monitor the temperature of the reactor wall and feed back to the main control box.

4. The system according to claim 3, characterized in that The high temperature and high pressure test subsystem further includes: a hydraulic pump with a lifting arm, wherein the lifting arm of the hydraulic pump is connected to the reactor end cover, and the lifting arm is driven by the hydraulic pump to drive the reactor end cover to move.

5. The system according to any one of claims 1 to 4, characterized in that: The gas source supply subsystem comprises: an ultrapure nitrogen tank and a mixed gas source tank, wherein the ultrapure nitrogen tank and the mixed gas source tank are respectively connected to the high temperature and high pressure reactor; A three-way valve and a first gas valve are sequentially arranged on the first pipeline between the ultrapure nitrogen tank, the mixed gas source tank and the high-temperature and high-pressure reactor; a first pressure reducing valve is arranged on the first pipeline between the ultrapure nitrogen tank and the three-way valve; and a second pressure reducing valve is arranged on the first pipeline between the mixed gas source tank and the three-way valve.

6. The system according to any one of claims 1 to 4, characterized in that: The waste gas treatment subsystem includes: a first alkali liquid tank, a second alkali liquid tank and a circulating cooler; The first alkali liquid tank is connected to the reactor end cover of the high-temperature and high-pressure reactor through a second pipeline; a flow meter and a second gas valve are provided on the second pipeline; the first alkali liquid tank and the second alkali liquid tank are connected through a third pipeline; the second alkali liquid tank is connected to an external fourth pipeline, and a hydrogen concentration monitoring meter and a third gas valve are provided on the fourth pipeline; the second alkali liquid tank is connected to an acid-base detection meter; the circulating cooler is connected to the outer layer of the first alkali liquid tank.

7. The system according to claim 6, characterized in that The circulating cooler is provided with a start button, a stop button, a temperature display, a flow display and a flow adjustment knob; the start button and the stop button are used to start and stop the circulating cooler, the temperature display and the flow display are used to monitor the circulation parameters of the coolant in the circulating cooler, and the flow adjustment knob is used to regulate the flow rate of the coolant.

8. The system according to any one of claims 1 to 4, characterized in that: The main control box is provided with a kettle temperature display, a kettle wall temperature display, a kettle pressure display, a heating voltage meter, a touch screen, a heating start button and a heating stop button; The touch operation screen is used to set the test temperature, heating voltage and test time of the high-temperature and high-pressure reactor; the temperature display inside the reactor is used to monitor the temperature inside the reactor of the high-temperature and high-pressure reactor in real time, the temperature display inside the reactor wall is used to monitor the temperature of the reactor wall of the high-temperature and high-pressure reactor in real time, the heating voltage meter is used to monitor the voltage of the heating resistor group on the high-temperature and high-pressure reactor in real time, and the pressure display inside the reactor is used to monitor and display the pressure inside the reactor of the high-temperature and high-pressure reactor in real time through the barometer; the heating start button and the heating stop button are used to control the start and stop of the main control box.

9. A simulated shale oil in-situ heating well operating condition test and waste gas treatment method, characterized in that: The simulated shale oil in-situ heating well operating condition test and waste gas treatment system according to any one of claims 1 to 8 performs a simulation test and waste gas treatment, comprising: The corrosion test sample to be tested is placed in a high-temperature and high-pressure reactor of the high-temperature and high-pressure test subsystem, and a certain amount of deionized water is injected into the high-temperature and high-pressure reactor, and then the high-temperature and high-pressure reactor is sealed; Open the gas source supply subsystem to inject high-purity nitrogen into the high-temperature and high-pressure reactor to displace the air in the high-temperature and high-pressure reactor and the pipeline; then inject a mixed gas of carbon dioxide, hydrogen sulfide and hydrogen into the high-temperature and high-pressure reactor, monitor the air pressure in the reactor of the high-temperature and high-pressure reactor in real time through the main control box and the pressure gauge of the high-temperature and high-pressure test subsystem, and close the gas source supply subsystem after the air pressure in the reactor reaches the set value; The test temperature, heating voltage and test time in the high temperature and high pressure reactor are set based on the main control box, and the heating resistor group in the high temperature and high pressure test subsystem electric control device is turned on until the temperature is stable and then the test is started; The temperature inside the reactor, the temperature of the reactor wall, the gas pressure inside the reactor and the heating voltage of the high-temperature and high-pressure reactor are monitored and recorded in real time by the main control box and the electronic control device; After the set test time is reached, the main control box controls the heating resistor group to stop running and turns on the exhaust gas treatment subsystem to treat the exhaust gas; After the main control box monitors that there is no pressure in the high-temperature and high-pressure reactor, all valves of the system and the circulating cooler of the exhaust gas treatment subsystem are closed, and the corrosion test sample to be tested is taken out to end the test.

10. The method according to claim 9, characterized in that Specifically include: The reactor end cover of the high-temperature and high-pressure reactor is opened by using the hydraulic pump of the high-temperature and high-pressure test subsystem, and the corrosion test sample to be tested is loaded into the corundum boat of the high-temperature and high-pressure test subsystem, and the corundum boat is placed on the honeycomb ceramic tray of the high-temperature and high-pressure test subsystem, and then the corundum boat and the honeycomb ceramic tray are loaded into the reactor body of the high-temperature and high-pressure reactor; after a certain amount of deionized water is injected into the reactor body, the reactor end cover is lowered by using the hydraulic pump, and the reactor end cover of the high-temperature and high-pressure reactor is fixed to the reactor body by using the reactor bolts of the high-temperature and high-pressure reactor, so that the high-temperature and high-pressure reactor is closed; Open the ultrapure nitrogen tank, the first gas valve and the first pressure reducing valve of the gas source supply subsystem, and open the second gas valve and the third gas valve of the exhaust gas treatment subsystem, adjust the three-way valve of the gas source supply subsystem according to the flow meter of the exhaust gas treatment subsystem, and continuously inject ultrapure nitrogen into the high-temperature and high-pressure reactor to exhaust the air in the high-temperature and high-pressure reactor and the pipeline; after continuously injecting ultrapure nitrogen for 2 hours, close the ultrapure nitrogen tank and the first pressure reducing valve, and after monitoring that there is no pressure in the high-temperature and high-pressure reactor according to the pressure gauge of the main control box and the high-temperature and high-pressure test subsystem, close the second gas valve and the third gas valve; Open the mixed gas source tank and the second pressure reducing valve of the gas source supply subsystem, inject a mixed gas of carbon dioxide, hydrogen sulfide and hydrogen into the high-temperature and high-pressure reactor, monitor the gas pressure in the reactor of the high-temperature and high-pressure reactor in real time through the main control box and the pressure gauge, and close the mixed gas source tank, the second pressure reducing valve, the three-way valve and the first gas valve after the gas pressure in the reactor reaches the set value; The test temperature, heating voltage and test time in the high temperature and high pressure reactor are set based on the touch screen of the main control box, and the heating resistor group is turned on until the temperature is stable before starting the test; The temperature inside the high-temperature and high-pressure reactor is monitored in real time by the in-reactor thermocouple in the electric control device, and is recorded in real time by the main control box; the temperature of the reactor wall of the high-temperature and high-pressure reactor is monitored in real time by the in-reactor thermocouple in the electric control device, and is recorded in real time by the main control box; the air pressure inside the reactor of the high-temperature and high-pressure reactor is monitored in real time by the barometer, and is recorded in real time by the main control box; the heating voltage of the high-temperature and high-pressure reactor is monitored in real time by the heating voltage meter on the main control box, and is recorded in real time by the main control box; After the set test time is reached, the main control box controls the heating resistor group to stop running, turns on the circulating cooler of the exhaust gas treatment subsystem, and adjusts the circulation parameters of the coolant in the circulating cooler to be normal; After the temperature in the high-temperature and high-pressure reactor drops to 70°C, the second gas valve is opened, and the rate of discharge into the first alkali liquid tank in the waste gas treatment subsystem is adjusted according to the flow meter; after the gas is discharged into the second alkali liquid tank in the waste gas treatment subsystem, it is judged whether the acidic gas in the mixed gas is completely removed according to the acid-base detection table in the waste gas treatment subsystem; and then it is judged whether the hydrogen concentration in the mixed gas is appropriate according to the hydrogen concentration monitoring table in the waste gas treatment subsystem. After the hydrogen concentration is appropriate, the third gas valve is opened to discharge the harmless waste gas into the atmosphere; After the main control box monitors that there is no pressure in the high-temperature and high-pressure reactor, all valves of the system and the circulating cooler of the exhaust gas treatment subsystem are closed; the bolts of the reactor are unscrewed, the port of the reactor is raised using the hydraulic pump, and the corrosion test sample is taken out to end the test.

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