CN112730503B - Operation method of a simulation device for exploiting oil shale with high-temperature fluid - Google Patents

Abstract

The invention relates to an operation method of a simulation device for exploiting oil shale by high-temperature fluid, belonging to the technical field of special exploitation of underground unconventional oil and gas resources; based on the simulation device comprising a reaction device, a high-temperature fluid generating system, a main-path large-scale rapid condenser, a branch condensing and product collecting system and a temperature monitoring system, the inside of the reaction kettle is filled with broken oil shale blocks or complete oil shale cores, slurry is injected into the kettle body to form a large-scale composite structure, the rigid pressure transmission assembly is used for applying stress, tests of exploiting the oil shale by using the high-temperature fluid under the action of factors such as different heat injection temperatures, different pyrolysis times, different pyrolysis paths and the like are carried out, the primary cooling system and the secondary cooling system are used for collecting oil gas products, quantitative characterization of the multivariates such as pyrolysis temperatures, pyrolysis times, reaction paths and the like on the oil yield and quality of the oil shale can be obtained, and guidance is provided for the arrangement of on-site heat injection wells and exploitation well intervals.

Description

An operating method of a simulation device for exploiting oil shale with high-temperature fluid

technical field

The invention belongs to the technical field of special exploitation of underground unconventional oil and gas resources, and in particular relates to an operation method of a simulation device for exploiting oil shale by high-temperature fluid.

Background technique

The oil shale reserves are abundant in the world, which can be converted into 454.6 billion tons of shale oil, which is much higher than the world's proven crude oil reserves. Its efficient exploitation is of great significance to alleviate the current situation of oil shortage. Most of the oil shale resources are stored underground. At present, many countries in the world advocate the exploitation of oil shale through in-situ heating technology. According to different heat sources, the in-situ heating methods of oil shale can be divided into conduction heating, convective heating and combustion. Three categories with radiant heating. In view of the extremely poor thermal conductivity of oil shale, many experts and scholars at home and abroad are actively conducting research on oil shale mining technology by convective heating. The organic matter (kerogen) is heated, and the oil and gas produced by the cracking of the kerogen are extracted through the production well. In this process, factors such as heat injection temperature, pyrolysis time, and pyrolysis distance all affect the quality of oil and gas products. Obtaining these reasonable parameters is of great significance to the field application of in-situ heating technology. Therefore, it is necessary to obtain the quantitative influence law of each influencing factor on oil and gas quality under the condition of high temperature fluid production. The existing simulation devices are small in size and can only be used to study the influence of heat injection temperature on the quality of oil and gas products in oil shale. The results obtained cannot provide a reference for the spacing arrangement of heat injection wells and production wells, and cannot provide a theoretical basis for field practice.

Contents of the invention

The invention overcomes the deficiencies of the prior art, and proposes an operation method of a simulation device for exploiting oil shale with high-temperature fluid; it solves the current problem that the existing device cannot accurately and comprehensively simulate the quality of oil and gas products under the control of various variables.

In order to achieve the above object, the present invention is achieved through the following technical solutions.

An operation method of a simulation device for exploiting oil shale with high-temperature fluid, based on the following simulation device, the simulation device consists of a high-temperature and high-pressure long-distance reaction device, a high-temperature fluid generation system, a large-scale fast condenser in the main road, branch condensation and Composition of product collection system and temperature monitoring system;

The high-temperature and high-pressure long-distance reaction device includes a reactor and a rigid pressure transmission component. The upper part of the reactor is provided with a grouting hole and several temperature measuring holes on both sides of the grouting hole. The grouting hole is provided with a grouting valve. , the temperature measuring hole is connected with a thermocouple, the side of the reaction kettle is provided with several condensation holes, and a second valve is arranged on the pipeline connecting the condensation hole with the branch condensation and the product collection system;

The rigid pressure transmission assembly includes a pressure transmission head, a buckle of the pressure transmission head, an axial displacement gauge, a liquid inlet of the pressure transmission chamber, an assembly flange of the pressure transmission chamber, a connecting flange, a water circulation cooling device, a pressure transmission chamber, and a rigid transmission chamber. The pressure component is connected to the reactor through the connecting flange;

The high-temperature fluid generation system pipe is connected to the reaction kettle through the first overheating pipe, the first overheating pipe is provided with a first valve, and the main road large-scale fast condenser is connected to the rigid pressure transmission component through the second overheating pipe ;

The branch condensation and product collection system mainly includes a primary cooling device, a secondary cooling device, and an oil and gas collection device. The primary cooling device and the secondary cooling device include the same number of closed tanks arranged in series in one-to-one correspondence, A heat exchange spiral tube is arranged in the tank body, and the tank bodies are connected to each other through pipelines, and an oil gas collection device is connected to the lower part of the tank body of the secondary cooling device;

The specific operation steps of the simulation method based on the above-mentioned simulation device are:

S1: The inside of the reactor is filled with broken oil shale blocks or complete oil shale cores, and high-strength blind plates are installed at both ends of the reactor to limit the migration of rock mass;

S2: Inject mud into the reactor through the grouting hole. The mud is a mixture of oil shale powder and muddy cement. The ratio of the two is between 1:1 and 3:1, and the grouting rate is 1.5L/ Between min~5L/min, stop grouting after filling and close the grouting valve;

S3: After the slurry is fully dried, remove the blind plates on both sides of the reaction kettle, connect the rigid pressure transmission component with the reaction kettle through the connecting flange, close the first valve, adjust the position of the pressure transmission head through the buckle of the pressure transmission head, The water circulation cooling device is fed with circulating water, and the specified hydraulic oil is introduced from the liquid inlet of the pressure transmission chamber to the specified pressure, and the corresponding axial load is applied through the rigid pressure transmission component, and the axial displacement meter can record the depth of the pressure transmission head entering the reactor;

S4: When the temperature of the hot fluid is low, open the first valve slightly to make the fluid preheat the reactor; when the temperature of the high-temperature fluid is high, fully open the first valve to make the high-temperature fluid start to pyrolyze the oil by convection heating shale;

S5: Based on the temperature of the thermocouple, when the temperature is 300°C, the pyrolysis time is controlled to be fixed, and the second valve is opened in turn to carry out oil and gas collection for a specific time; after that, the second valve is closed to continue to extend the pyrolysis time, Repeat the above work to carry out oil and gas collection work under different pyrolysis time;

S6: The upper part of the large fast condenser on the main road is the gas production port, and the lower part is the oil production port; while the shale oil in the oil and gas collection device will float on the water surface, and finally it can be separated by physical methods. carry out gas collection;

S7: After completing the oil and gas collection work at the previous heat injection temperature, close the second valve, raise the temperature of the high-temperature fluid to the next temperature point, and perform oil and gas collection work under different pyrolysis times;

S8: The temperature is raised at intervals of 50°C, and the oil and gas collection work is completed according to the above steps, until the temperature reaches 550°C, and the oil and gas collection work is completed;

S9: Conduct density test and simulated distillation analysis on the collected shale oil, and quantitatively analyze the API value of shale oil and the yield of different distillate oil under different heat injection temperature, pyrolysis time and pyrolysis path, and the page can be obtained Quantitative relationship between rock oil quality and injection temperature, pyrolysis time and pyrolysis distance.

Further, the high-temperature fluid generation system includes a high-pressure pump and a heating device. A check valve is arranged on the pipeline between the high-pressure pump and the heating device. The heating device includes a kettle body, and a boiler steel coil is wound around the outside of the kettle body. , the boiler steel coil is connected to the reaction kettle through the first overheating pipe.

Further, in the step S4, the fluid is injected into the kettle body of the heating device through a high-pressure pump to heat the kettle body, and the boiler steel coil is heated again when the temperature of the fluid exceeds its boiling point.

Further, the second valve is set on the pipe connecting the heat exchange coil inside the tank of the primary cooling device and the condensation hole of the reaction kettle; the heat exchange coil inside the primary cooling device communicates with the lower part through the pipeline. The heat exchange spiral tube inside the corresponding secondary cooling device is connected, and the first temperature induction electromagnetic control valve is arranged on the pipeline; the heat exchange coil tube inside the secondary cooling device directly collects the corresponding oil and gas through the pipeline. The devices are connected; the outlet of the heat exchange spiral tube of the primary cooling device is provided with a pipeline directly leading to the oil and gas collection device, and the pipeline is provided with a second temperature-sensing electromagnetic control valve.

Further, when performing branch condensation and product collection work at different heat injection temperatures, when the outlet temperature of the high-efficiency heat exchange spiral tube of the primary cooling device reaches the boiling point of the heat injection fluid, the second temperature-sensing electromagnetic control valve is closed, and the second temperature-sensing electromagnetic control valve is closed. A temperature-sensing electromagnetic control valve is opened. At this time, both the primary cooling device and the secondary cooling device are cooling the fluid. The temperature-sensing electromagnetic control valve is opened, and the first temperature-sensing electromagnetic control valve is closed. At this time, only the first-stage cooling device performs fluid cooling.

Furthermore, the test temperature can reach 600°C, which can simulate the geological environment with a buried depth of less than 500m.

Furthermore, by fitting the relationship between the quality of shale oil obtained under different heat injection temperatures and different pyrolysis times and the reaction path, it can provide guidance for the distance between heat injection wells and production wells.

The beneficial effect that the present invention produces relative to prior art is:

(1) By using the simulation device provided by the present invention, the pyrolysis test of oil shale at a length of 6m can be carried out, and the scale is larger, and the simulation process of oil shale recovery by high-temperature fluid is closer to the field.

(2) By using the simulation device provided by the present invention, the quantitative characterization of the output and quality of oil shale oil by multiple variables such as pyrolysis temperature, pyrolysis time, and reaction path can be obtained.

(3) By using the simulation device provided by the present invention and the simulation method using the device, it is possible to provide guidance for the layout of the spacing between heat injection wells and production wells on site.

(4) The simulation device provided by the present invention has simple arrangement of samples and is easy to operate.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is the structural representation of reactor and branch condensation and product collection system among Fig. 1;

Fig. 3 is the axial sectional view of Fig. 2;

Fig. 4 is a schematic structural view of the rigid pressure transmission assembly in Fig. 1;

Among them, 1 is the reaction kettle, 2 is the composite oil shale sample structure, 3 is the flange, 4 is the grouting hole, 5 is the thermocouple, 6 is the condensation hole, 7 is the pressure transmission head, and 8 is the pressure transmission head Buckle, 9 is the axial displacement gauge, 10 is the liquid inlet of the pressure transmission chamber, 11 is the connecting flange, 12 is the assembly flange of the pressure transmission chamber, 13 is the water circulation cooling device, 14 is the sawtooth blade, 15 is the high pressure pump, 16 is a one-way valve, 17 is a heating device, 18 is a kettle body, 19 is a boiler steel coil, 20 is a safety valve, 21 is the first superheating pipe, 22 is a pressure gauge, 23 is the first valve, 24 is the second Overheating pipe, 25 is the main road large fast condenser, 26 is the primary cooling device, 27 is the secondary cooling device, 28 is the oil and gas collection device, 29 is the tank body, 30 is the second valve, 31 is the heat exchange coil, 32 is coolant, 33 is the first temperature-sensing electromagnetic control valve, 34 is the second temperature-sensing electromagnetic control valve, 35 is conduit, 36 is desiccant, 37 is cooling equipment, 38 is booster pump, 39 is paperless Recorder, 40 is a PC, 41 is a grouting valve.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail in combination with the embodiments and accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. The technical solution of the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

The present invention provides an operation method of a simulation device for exploiting oil shale by high-temperature fluid, and the simulation method is based on the following simulation device. As shown in Figures 1-4, the simulation device consists of a high-temperature and high-pressure long-distance reaction device, a high-temperature fluid generation system, a large-scale fast condenser 25 in the main road, a branch condensation and product collection system, and a temperature monitoring system.

The high temperature and high pressure long-distance reaction device includes a reaction kettle 1 and a rigid pressure transmission component.

The reaction kettle 1 is a cylindrical structure arranged horizontally, its length is designed to be 6.0m, and its inner diameter is designed to be 101mm. The interior of the reaction kettle 1 is equipped with a composite oil shale sample structure 2, and the two ends of the reaction kettle 1 are welded with high temperature resistant High pressure flange 3. Boreholes are drilled equidistantly at different positions on the upper part of the reactor 1 with a distance of 0.8 m, and there are 8 groups of boreholes in total. Wherein, the bore hole in the middle part is the grouting hole 4, is used for the injection of mud, and the grouting hole 4 is provided with the grouting valve 41, and all the other boreholes are the temperature measuring holes that link to each other with the high-precision K-type thermocouple 5, use To monitor the temperature of different positions inside the reactor 1; the side of the reactor 1 is provided with 7 groups of condensation holes 6, and the condensation holes 6 correspond to the temperature measuring holes on the upper part one by one, that is, the corresponding condensation holes 6 and the measuring holes The temperature hole is located on the same cross section of the reactor 1, and the reactor 1 is connected to the branch condensation and product collection system through the condensation hole 6.

The periphery of the reaction kettle 1 is kept insulated by a high-temperature-resistant heat-insulating material to reduce heat loss. Composite oil shale sample structure 2 is composed of oil shale block and the mud injected in the grouting hole. The oil shale block can be a complete core or a broken block. The mud injected into the grouting hole 4 is a mixture of oil shale powder and muddy cement, the ratio of which is between 1:1 and 3:1, and the grouting rate is 1.5L/min~5L/min.

The rigid pressure transmission assembly mainly includes a pressure transmission head 7, a pressure transmission head buckle 8, an axial displacement gauge 9, a liquid inlet 10 of the pressure transmission chamber, an assembly flange 12 of the pressure transmission chamber, and a connection between the pressure transmission system and the reactor. Flange 11, water circulation cooling device 13 and pressure transmission chamber.

The entire rigid pressure transmission component is connected to the reactor 1 through the connecting flange 11, and the rigid pressure transmission component can be disassembled as a whole by unscrewing the connecting flange 11; Then install the buckle 8 of the pressure transmission head, inject pressure fluid into the pressure transmission chamber through the liquid inlet 10 of the pressure transmission chamber, and the pressure provided by the pressure fluid is transmitted from the buckle 8 of the pressure transmission head to the pressure transmission head 7, so that the pressure transmission head The pressure head 7 provides pressure forward, and the pressure is controlled by the pressure fluid; the axial displacement meter 9 can record the axial displacement. When the initial stress is provided before the simulation experiment starts, since the length of the reactor 1 is 6.0m, the inside of the reactor 1 The displacement of the sample in the compaction stage is relatively large, and the hydraulic chamber needs to be retracted to the initial state in advance. If the stroke of the hydraulic chamber is not enough when the axial pressure is applied by a single liquid injection, the pressure should be maintained after reaching the maximum stroke each time, and the axial deformation is stable. Finally, quickly retract the hydraulic chamber to the initial state, change the snap position of the buckle 8 on the pressure transmission head 7, make the pressure transmission head 7 move forward against the sample, and inject the pressure fluid through the liquid inlet of the pressure transmission chamber again, Axial compression is applied to the sample.

A plurality of sawtooth blades 14 are arranged between the inside of the water circulation cooling device 13 and the connecting flange 11, so as to improve the heat exchange efficiency.

The high-temperature fluid generation system includes a high-capacity fluid high-pressure pump 15 , a corrosion-resistant one-way valve 16 and a heating device 17 . The corrosion-resistant one-way valve 16 is arranged on the pipeline between the high-pressure pump 15 and the heating device 17, so that the fluid output by the high-pressure pump 15 can be sent to the heating device 17 in one direction, and the fluid of the heating device 17 can be blocked from flowing to the high-pressure pump. 15 reflow. The fluid can be water or other fluids that are not prone to explosion at high temperatures, or a mixture of the two.

The structure of the heating device 17 mainly includes a high-temperature and high-pressure resistant kettle body 18, a multi-turn corrosion-resistant boiler steel coil pipe 19 closely surrounding the outside of the kettle body 18, and a safety valve 20, and the safety valve 20 is arranged on the kettle body 18. The top of the top; the kettle body 18 is used as a primary heater, which mainly plays the role of changing the fluid phase from liquid to gaseous; the boiler steel coil 19 is used as a secondary heater, mainly plays the role of continuous heating of the hot fluid; The above-mentioned safety valve 20 is used to control the pressure inside the kettle body 18 not to exceed a specified value, and plays a protective role in personal safety and equipment operation.

The boiler steel coil pipe 19 is connected to the high temperature and high pressure resistant flange 3 through the first overheating pipe 21 , and the first high temperature and high pressure resistant first valve 23 and pressure gauge 22 are welded on the first overheating pipe 21 .

The main road large fast condenser 25 is connected to the rigid pressure transmission component through the second overheating pipe 24, and is mainly used for cooling high-temperature fluid and oil and gas products.

The branch condensation and product collection system mainly includes a primary cooling device 26 , a secondary cooling device 27 and an oil and gas collection device 28 . The primary cooling device 26 mainly includes seven sets of airtight stainless steel tanks 29 arranged in series, each of which is equipped with efficient heat exchange spiral tubes 31 , and the tanks 29 are connected to each other through pipelines. The secondary cooling device 27 also includes seven sets of airtight stainless steel tanks 29 arranged in series, each of which is provided with a high-efficiency heat exchange spiral tube 31 , and the tanks 29 are also connected to each other through pipelines. The oil and gas collecting device 28 is equipped with water inside, and the upper part is connected with a conduit 35. The inlet end of the conduit 35 is arranged inside the oil and gas collecting device 28 and is separated from the water surface by a certain distance. The conduit 35 is equipped with a desiccant 36 inside.

The seven groups of tanks 29 of the primary cooling device 26 are respectively arranged at the lower end of the condensation holes 6 of the reaction kettle 1 and correspond to each other. connected, a second valve 30 is set on the pipeline.

The seven groups of tank bodies 29 of the secondary cooling device 27 are respectively arranged on the lower part of the seven groups of tank bodies 29 of the primary cooling device 26 and correspond one by one; The lower parts of the seven groups of tank bodies 29 of the cooling device 27 are in one-to-one correspondence.

The heat exchange spiral tube 31 inside the primary cooling device 26 is connected with the heat exchange spiral tube 31 inside the secondary cooling device 27 corresponding to the lower part by welding a stainless steel straight tube, and the connected stainless steel straight tube is provided with a first A temperature-sensing electromagnetic control valve 33, when the temperature exceeds the boiling point of the injection fluid, the first temperature-sensing electromagnetic control valve 33 will be opened.

The heat exchange spiral tube 31 inside the secondary cooling device 27 is directly connected with the oil gas collection device 28 corresponding to the lower part by welding a stainless steel straight pipe, and the stainless steel straight pipe extends below the water surface inside the oil gas collection device 28 .

The outlet position of the heat exchange spiral tube 31 of the primary cooling device 26 is welded with a stainless steel straight pipe directly leading to the oil and gas collection device 28, and the stainless steel straight pipe extends below the water surface inside the oil and gas collection device 28. A second temperature-sensing electromagnetic control valve 34 is provided, and when the temperature exceeds the boiling point of the heating fluid, the second temperature-sensing electromagnetic control valve 34 will be closed.

The airtight stainless steel tank body 29 of the primary cooling device 26 and the secondary cooling device 27 is equipped with a cooling liquid 32, and the cooling liquid 32 is a mixed liquid of 45% ethylene glycol and 55% water. Each tank body 29 is connected in series, and the rapid cooling and cooling device 37 is externally connected, which can create a low temperature environment of -20°C. A corrosion-resistant booster pump 38 is installed between the cooling device 37 and the airtight stainless steel tank body 29.

The temperature monitoring system includes a high-precision K-type thermocouple 5, a paperless recorder 39 and a PC40, the thermocouple 5 is used to monitor the temperature of different positions inside the reactor, and the paperless recorder 39 collects the temperature data It is recorded in the internal storage system of the instrument with time as the base axis, and PC40 is used to view the collected temperature data in real time.

The simulation device for oil shale exploitation by high-temperature fluid under the control of the above-mentioned multivariate factors can stress-constrain and convectively heat oil shale. The heat injection temperature can reach up to 600°C, and can simulate the geological environment with a buried depth of less than 500m. The high temperature and high pressure long-distance reactor 1 has a length of 6m, which can realize the oil and gas collection function under different reaction paths. According to the quantitative relationship between the quality of oil and gas and the reaction path, it can provide a basis for the actual layout of the spacing between heat injection wells and production wells on site.

Example 1

When the buried depth of oil shale is 150m, the heat injection temperature is 400°C. The method of using the simulation device for oil shale exploitation by high-temperature fluid under the control of the above-mentioned multivariate factors, the specific operation steps are as follows:

1. The inside of the high-temperature and high-pressure long-distance reactor 1 is filled with broken oil shale blocks or complete oil shale cores, and high-strength blind plates are installed at both ends of the reactor 1 to limit the migration of rock mass;

2. Inject slurry into the reactor 1 through the grouting hole 4. The ratio of oil shale powder and muddy cement is set to 1:1, and the grouting rate is 5L/min. After filling, stop grouting and close the grouting valve 41;

3. After the slurry is fully dried, remove the blind plates on both sides of the high-temperature and high-pressure long-distance reactor 1, connect the rigid pressure transmission component with the high-temperature and high-pressure long-distance reactor 1 through the connecting flange 11, and close the first valve 23. Adjust the position of the pressure transmission head 7 through the buckle 8 of the pressure transmission head, pass the circulating water to the water circulation cooling device 13, pass the specified hydraulic oil through the liquid inlet 10 of the pressure transmission chamber to the specified pressure, and apply the corresponding shaft pressure through the rigid pressure transmission assembly. The axial displacement gauge 9 can record the depth of the pressure transmission head 7 entering the high temperature and high pressure long-distance reactor 1;

4. The fluid is injected into the kettle body 18 of the heating device 17 through the large-capacity fluid high-pressure pump 15, and the kettle body 18 is heated. When the temperature of the fluid exceeds its boiling point, the boiler steel coil 19 is heated again. When the hot fluid When the temperature is low, open the first valve 23 slightly to preheat the fluid to the reactor 1; when the temperature of the high-temperature fluid is high, fully open the first valve 23, so that the high-temperature fluid begins to pyrolyze the oil shale by convection heating ;

5. Based on the temperature of the thermocouple 5, when the temperature is 300°C, control the pyrolysis time for a certain period, and open the second valve 30 in turn to carry out the oil and gas collection work for a specific time; then close the second valve 30 to continue to prolong the pyrolysis time. pyrolysis time, repeat the above work, and carry out oil and gas collection work under different pyrolysis time;

6. The upper part of the large fast condenser 25 in the main road is the gas production port, and the lower part is the oil production port; while the shale oil in the oil and gas collection device 28 will float on the water surface, and finally it can be separated by physical methods, and the outlet of the conduit 35 can be used for gas collection;

7. After completing the oil and gas collection work at the previous heat injection temperature, close the second valve 30, raise the temperature of the high-temperature fluid to the next temperature point, and carry out the oil and gas collection work under different pyrolysis times in the same way;

8. Raise the temperature at intervals of 50°C, complete the oil and gas collection work according to the above steps, until the temperature reaches 550°C, the oil and gas collection work is completed;

9. Conduct density test and simulated distillation analysis on the collected shale oil, and conduct quantitative analysis on the API value of shale oil and the yield of different distillate oil under different heat injection temperature, pyrolysis time and pyrolysis path, and the page can be obtained Quantitative relationship between rock oil quality and heat injection temperature, pyrolysis time and pyrolysis distance;

10. By fitting the relationship between the quality of shale oil obtained under different heat injection temperatures and different pyrolysis times and the reaction path, it can provide guidance for the distance between heat injection wells and production wells.

To further illustrate, when performing branch condensation and product collection work at different heat injection temperatures, when the outlet temperature of the high-efficiency heat exchange spiral tube 31 of the primary cooling device 26 reaches the boiling point of the heat injection fluid, the second temperature-sensing electromagnetic control valve 34 closed, the first temperature-sensing electromagnetic control valve 33 is opened, and at this time, the primary cooling device 26 and the secondary cooling device 27 both perform fluid cooling. When the outlet temperature of the high-efficiency heat exchange spiral tube 31 of the primary cooling device 26 does not reach the boiling point of the heating fluid, the second temperature-sensitive electromagnetic control valve 34 is opened, and the first temperature-sensitive electromagnetic control valve 33 is closed. At this time, only the primary cooling The device performs the cooling work of the fluid.

Example 2

When the buried depth of oil shale is 500m, the heat injection temperature is 600°C. A method for using a simulation device for high-temperature fluid exploitation of oil shale under the control of multivariable factors, the specific operation steps are:

1. The inside of the high-temperature and high-pressure long-distance reactor 1 is filled with broken oil shale blocks or complete oil shale cores, and high-strength blind plates are installed at both ends of the reactor 1 to limit the migration of rock mass;

2. Inject grout into reactor 1 through grouting hole 4, set the ratio of oil shale powder to muddy cement at 3:1, and grouting rate at 1.5L/min, stop grouting after filling, and close grouting valve 41;

3. After the slurry is fully dried, remove the blind plates on both sides of the high-temperature and high-pressure long-distance reactor 1, connect the rigid pressure transmission component with the high-temperature and high-pressure long-distance reactor 1 through the flange 3, and close the first valve 23. Adjust the position of the pressure transmission head 7 through the buckle 8 of the pressure transmission head, pass the circulating water to the water circulation cooling device 13, pass the specified hydraulic oil through the liquid inlet 10 of the pressure transmission chamber to the specified pressure, and apply the corresponding shaft pressure through the rigid pressure transmission assembly. The axial displacement gauge 9 can record the depth of the pressure transmission head 7 entering the high temperature and high pressure long-distance reactor 1;

4. The fluid is injected into the kettle body 18 of the heating device 17 through the large-capacity fluid high-pressure pump 15, and the kettle body 18 is heated. When the temperature of the fluid exceeds its boiling point, the boiler steel coil 19 is heated again. When the hot fluid When the temperature is low, open the first valve 23 slightly to preheat the fluid to the reactor 1; when the temperature of the high-temperature fluid is high, fully open the first valve 23, so that the high-temperature fluid begins to pyrolyze the oil shale by convection heating ;

5. Based on the temperature of the thermocouple 5, when the temperature is 300°C, control the pyrolysis time for a certain period, and open the second valve 30 in turn to carry out the oil and gas collection work for a specific time; then close the second valve 30 to continue to prolong the pyrolysis time. pyrolysis time, repeat the above work, and carry out oil and gas collection work under different pyrolysis time;

6. The upper part of the large fast condenser 25 in the main road is the gas production port, and the lower part is the oil production port; while the shale oil in the oil and gas collection device 28 will float on the water surface, and finally it can be separated by physical methods, and the outlet of the conduit 35 can be used for gas collection;

7. After completing the oil and gas collection work at the previous heat injection temperature, close the first valve 23, raise the temperature of the high-temperature fluid to the next temperature point, and carry out the oil and gas collection work under different pyrolysis times;

8. Raise the temperature at intervals of 50°C, complete the oil and gas collection work according to the above steps, until the temperature reaches 550°C, the oil and gas collection work is completed;

9. Conduct density test and simulated distillation analysis on the collected shale oil, and conduct quantitative analysis on the API value of shale oil and the yield of different distillate oil under different heat injection temperature, pyrolysis time and pyrolysis path, and the page can be obtained Quantitative relationship between rock oil quality and heat injection temperature, pyrolysis time and pyrolysis distance;

10. By fitting the relationship between the quality of shale oil obtained under different heat injection temperatures and different pyrolysis times and the reaction path, it can provide guidance for the distance between heat injection wells and production wells.

To further illustrate, when performing branch condensation and product collection work at different heat injection temperatures, when the outlet temperature of the high-efficiency heat exchange spiral tube 31 of the primary cooling device 26 reaches the boiling point of the heat injection fluid, the second temperature-sensing electromagnetic control valve 34 closed, the first temperature-sensing electromagnetic control valve 33 is opened, and at this time, the primary cooling device 26 and the secondary cooling device 27 both perform fluid cooling. When the outlet temperature of the high-efficiency heat exchange spiral tube 31 of the primary cooling device 26 does not reach the boiling point of the heating fluid, the second temperature-sensitive electromagnetic control valve 34 is opened, and the first temperature-sensitive electromagnetic control valve 33 is closed. At this time, only the primary cooling The device performs the cooling work of the fluid.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (7)

1. An operation method of a simulation device for exploiting oil shale by high-temperature fluid is characterized by comprising the following steps: the simulation device comprises a high-temperature-resistant high-pressure-resistant long-distance reaction device, a high-temperature fluid generation system, a main-path large-scale rapid condenser (25), a branch condensation and product collection system and a temperature monitoring system;

the high-temperature-resistant high-pressure-resistant long-distance reaction device comprises a reaction kettle (1) and a rigid pressure transmission assembly, wherein a grouting hole (4) and a plurality of temperature measuring holes on two sides of the grouting hole are formed in the upper portion of the reaction kettle (1), a grouting valve (41) is arranged on the grouting hole (4), a thermocouple (5) is connected to the temperature measuring hole, a plurality of condensing holes (6) are formed in the side portion of the reaction kettle (1), and a second valve (30) is arranged on a pipeline, connected with a branch condensing and product collecting system, of the condensing holes (6);

the rigid pressure transmission assembly comprises a pressure transmission head (7), a pressure transmission head buckle (8), an axial displacement meter (9), a pressure transmission cavity liquid inlet (10), a pressure transmission cavity assembly flange (12), a connecting flange (11), a water circulation cooling device (13) and a pressure transmission cavity, and is connected with the reaction kettle (1) through the connecting flange (11);

the high-temperature fluid generating system is connected with the reaction kettle (1) through a first superheat pipe (21), a first valve (23) is arranged on the first superheat pipe (21), and the main-path large-sized rapid condenser (25) is connected with the rigid pressure transmission assembly through a second superheat pipe (24);

the branch condensation and product collection system mainly comprises a primary cooling device (26), a secondary cooling device (27) and an oil gas collection device (28), wherein the primary cooling device (26) and the secondary cooling device (27) comprise the same number of sealed groove bodies (29) which are in one-to-one correspondence and are arranged in series, heat exchange spiral pipes (31) are arranged in the groove bodies (29), the groove bodies (29) are connected with each other through pipelines, and the lower part of the groove body of the secondary cooling device (27) is connected with the oil gas collection device (28);

the operation steps of the simulation device are as follows:

s1: the inside of the reaction kettle (1) is filled with broken oil shale blocks or complete oil shale cores, and high-strength blind plates are arranged at two ends of the reaction kettle (1), so that rock mass migration is limited;

s2: injecting slurry into the reaction kettle (1) through a grouting hole (4), wherein the slurry is a mixture of oil shale powder and a shale cementing agent, the ratio of the oil shale powder to the shale cementing agent is 1:1-3:1, the grouting speed is 1.5L/min-5L/min, grouting is stopped after the grouting is completed, and a grouting valve (41) is closed;

s3: after the slurry is sufficiently dried, removing blind plates at two sides of the reaction kettle (1), connecting a rigid pressure transmission assembly with the reaction kettle (1) through a connecting flange (11), closing a first valve (23), adjusting the position of a pressure transmission head (7) through a pressure transmission head buckle (8), introducing circulating water into a water circulation cooling device (13), introducing specified hydraulic oil to the specified pressure through a pressure transmission cavity liquid inlet (10), applying corresponding axial load through the rigid pressure transmission assembly, and recording the depth of the pressure transmission head (7) entering the reaction kettle (1) by an axial displacement meter (9);

s4: heating the fluid by a high-temperature fluid generating system, and slightly opening a first valve (23) when the temperature of the hot fluid is low, so that the fluid preheats the reaction kettle (1); when the temperature of the high-temperature fluid is higher, the first valve (23) is completely opened, so that the high-temperature fluid starts to pyrolyze the oil shale in a convection heating mode;

s5: controlling pyrolysis time to be certain when the temperature of the thermocouple (5) is 300 ℃ as the reference, and sequentially opening the second valve (30) so as to perform oil gas collection work in specific time; then closing the second valve (30), continuing to prolong the pyrolysis time, repeating the work, and carrying out oil gas collection work under different pyrolysis time;

s6: the upper part of the main way large-scale rapid condenser (25) is provided with a gas extraction port, and the lower part is provided with a gas extraction port; shale oil in the oil-gas collecting device (28) floats on the water surface and can be separated through a physical method, a conduit (35) is arranged in the oil-gas collecting device (28), and the outlet of the conduit (35) can collect gas;

s7: after the oil gas collection work of the previous heat injection temperature is completed, the second valve (30) is closed, the temperature of the high-temperature fluid is increased to the next temperature point, and the oil gas collection work under different pyrolysis time is also carried out;

s8: heating at 50 ℃ every interval, and completing oil gas collection according to the steps until the temperature reaches 550 ℃;

s9: and carrying out density test and simulated distillation analysis on the collected shale oil, and carrying out quantitative analysis on the API values of the shale oil under different heat injection temperatures, pyrolysis time and pyrolysis routes and the yields of different distillate oils, so that the quantitative relation between the quality of the shale oil and the heat injection temperatures, the pyrolysis time and the pyrolysis routes can be obtained.

2. A method of operating a simulation apparatus for the production of oil shale from high temperature fluids as claimed in claim 1, wherein: the high-temperature fluid generation system comprises a high-pressure pump (15) and a heating device (17), wherein a one-way valve (16) is arranged on a pipeline between the high-pressure pump (15) and the heating device (17), the heating device comprises a kettle body (18), a boiler steel coil pipe (19) is wound on the outer side of the kettle body (18), and the boiler steel coil pipe (19) is connected with the reaction kettle (1) through a first overheating pipe (21).

3. A method of operating a simulation apparatus for the production of oil shale in high temperature fluid as claimed in claim 2, wherein: in the step S4, fluid is injected into a kettle body (18) of a heating device (17) through a high-pressure pump (15), the kettle body (18) is heated, and when the temperature of the fluid exceeds the boiling point of the fluid, a boiler steel coil (19) is heated.

4. A method of operating a simulation apparatus for the production of oil shale from high temperature fluids as claimed in claim 1, wherein: the second valve (30) is arranged on a pipeline in which a heat exchange spiral pipe (31) in a tank body (29) of the primary cooling device (26) is connected with a condensation hole (6) of the reaction kettle (1); the heat exchange spiral pipe (31) in the first-stage cooling device (26) is connected with the heat exchange spiral pipe (31) in the second-stage cooling device (27) corresponding to the lower part through a pipeline, and a first temperature induction electromagnetic control valve (33) is arranged on the pipeline; the heat exchange spiral pipe (31) in the secondary cooling device (27) is directly connected with the oil gas collecting device (28) corresponding to the lower part through a pipeline; the outlet position of a heat exchange spiral pipe (31) of the primary cooling device (26) is provided with a pipeline which directly leads to the oil gas collecting device (28), and a second temperature induction electromagnetic control valve (34) is arranged on the pipeline.

5. The method of operating a simulation apparatus for producing oil shale in hot fluid according to claim 4, wherein: when the branch condensation and product collection work are carried out under different heat injection temperatures, when the outlet temperature of the high-efficiency heat exchange spiral pipe (31) of the primary cooling device (26) reaches the boiling point of heat injection fluid, the second temperature induction electromagnetic control valve (34) is closed, the first temperature induction electromagnetic control valve (33) is opened, at the moment, the primary cooling device (26) and the secondary cooling device (27) both carry out the cooling work of the fluid, when the outlet temperature of the high-efficiency heat exchange spiral pipe (31) of the primary cooling device (26) does not reach the boiling point of the heat injection fluid, the second temperature induction electromagnetic control valve (34) is opened, the first temperature induction electromagnetic control valve (33) is closed, and at the moment, only the primary cooling device carries out the cooling work of the fluid.

6. A method of operating a simulation apparatus for the production of oil shale from high temperature fluids as claimed in claim 1, wherein: the test temperature can reach 600 ℃, and the geological environment with the buried depth of 500m below the shallow depth can be simulated.

7. A method of operating a simulation apparatus for the production of oil shale from high temperature fluids as claimed in claim 1, wherein: by fitting the relationship between the shale oil quality and the reaction path obtained under different heat injection temperatures and different pyrolysis times, guidance can be provided for the distance between the heat injection well and the production well.

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