Water-rock reaction simulation device and use method thereof

Abstract

The invention provides a water-rock reaction simulation device capable of realizing more sufficient water pressure reaction and more accurate simulation of underground water-rock reaction and a use method thereof, and relates to the technical field of water-rock reaction processes. The water-rock reaction simulation device comprises a reaction kettle, a constant-temperature box, a carbon dioxide gas cylinder, a nitrogen gas cylinder, a liquid adding tank, a piston intermediate container, a constant-speed constant-pressure pump and a vacuum pump, an exhaust pipe, a liquid taking pipe, an air inlet pipe and an exhaust pipe are arranged on the reaction kettle; a reaction kettle fixing mechanism is arranged in the constant-temperature box, the reaction kettle fixing mechanism is rotatably connected with the constant-temperature box through a horizontal shaft, and the constant-temperature box is also internally provided with a reaction kettle fixing mechanism connected with the constant-temperature box; the reaction kettle is arranged in the constant-temperature box through a reaction kettle fixing mechanism; and one ends of the carbon dioxide gas cylinder, the nitrogen gas cylinder and the piston intermediate container are respectively connected in parallel on the gas inlet pipe through a second on-off valve, a third on-off valve and a fourth on-off valve. According to the method, more data can be provided for actual production for reference.

Description

Technical Field

[0001] The invention relates to the technical field of water-rock reaction processes, and in particular to a water-rock reaction simulation device and a use method thereof. Background Art

[0002] With the development of economy, energy consumption is increasing, and at the same time, carbon dioxide emissions are also gradually increasing. Now the preferred method for dealing with carbon dioxide is carbon dioxide storage technology, which can not only properly handle carbon dioxide, but also be combined with enhanced oil recovery to create huge economic benefits. After carbon dioxide is injected underground, it will react with rocks and formation water. At the same time, the high temperature and high pressure environment of the formation causes the state of carbon dioxide to change. For carbon dioxide storage technology, the reaction and mechanism of supercritical carbon dioxide and water-rock are studied, and the interaction between carbon dioxide and formation water and formation rocks is analyzed, resulting in changes in the properties of formation water and formation rocks, the dissolution and generation of minerals, and the impact on the porosity and permeability characteristics of reservoir rocks. This has positive significance for evaluating the carbon dioxide storage effect of reservoir rocks.

[0003] At present, most of the experimental studies on water-rock reaction are carried out at room temperature, and there is a problem of insufficient water-rock reaction, which is very different from the actual formation environment. The corresponding conclusions cannot be well applied in the actual production process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a water-rock reaction simulation device and a use method thereof which can more fully react to water pressure and more accurately simulate underground water-rock reaction.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a water-rock reaction simulation device, including a reactor, a thermostat, a carbon dioxide gas cylinder, a nitrogen gas cylinder, a liquid adding tank, a piston intermediate container, a constant speed and pressure pump and a vacuum pump; the reactor is provided with an exhaust pipe, a liquid taking pipe, an air inlet pipe and an air extraction pipe, and the exhaust pipe, the liquid taking pipe, the air inlet pipe and the air extraction pipe are all provided with a first on-off valve;

[0006] The thermostatic box is provided with a reactor fixing mechanism, the reactor fixing mechanism is rotatably connected to the thermostatic box via a horizontal axis, and the thermostatic box is also provided with a flip control mechanism connected to the reactor fixing mechanism to control the reactor fixing mechanism to rotate around the horizontal axis;

[0007] The reactor is installed in a constant temperature box through a reactor fixing mechanism. The carbon dioxide cylinder, the nitrogen cylinder and one end of the piston intermediate container are connected in parallel to the air inlet pipe through the second on-off valve, the third on-off valve and the fourth on-off valve respectively. The constant speed and pressure pump is connected to the other end of the piston intermediate container, the vacuum pump is connected to the exhaust pipe, and the liquid collection pipe is connected to the liquid adding tank.

[0008] Furthermore, it also includes a tail gas absorption system.

[0009] Furthermore, the tail gas absorption system comprises a condenser and an acid gas adsorption device, and the air inlet of the acid gas adsorption device is connected to the exhaust pipe through the condenser.

[0010] Furthermore, the flip control mechanism includes a drive motor and a worm gear reducer, and the drive motor is connected to the horizontal shaft through the worm gear reducer.

[0011] Furthermore, the reactor is provided with a pressure sensor for measuring the air pressure in the reactor.

[0012] Furthermore, the reactor is also provided with a temperature sensor for measuring the temperature inside the reactor.

[0013] Furthermore, the reactor is also provided with an ion concentration sensor for measuring the anion concentration or cation concentration in the reactor.

[0014] Furthermore, the reactor fixing mechanism is a clamp locking mechanism.

[0015] Furthermore, the exhaust pipe, liquid collection pipe, air intake pipe and air extraction pipe are all provided with quick-release connectors for pipe connection.

[0016] The present invention also provides a method for using the water-rock reaction simulation device, comprising the following steps:

[0017] Place the core into the reactor, open the first on-off valve on the exhaust pipe, and use a vacuum pump to evacuate the reactor;

[0018] After the vacuum treatment is completed, first close the first on-off valve on the air extraction pipe and then open the first on-off valve on the liquid extraction pipe, add a certain amount of formation water to the reactor through the liquid adding tank, and finally close the first on-off valve on the liquid extraction pipe;

[0019] Start the thermostat, set the thermostat to the experimental temperature, and use the thermostat to heat the reactor;

[0020] After the temperature of the reactor reaches the experimental temperature, first open the second on-off valve and the fourth on-off valve to allow the carbon dioxide in the carbon dioxide cylinder to enter one end of the piston intermediate container until the amount of carbon dioxide filled into the piston intermediate container reaches the required value, then close the second on-off valve, open the first on-off valve on the air inlet pipe, and then start the constant speed and pressure pump to inject all the carbon dioxide in one end of the piston intermediate container into the reactor;

[0021] After the carbon dioxide injection is completed, first close the first on-off valve on the air inlet pipe, and then open the third on-off valve to allow the nitrogen in the nitrogen bottle to enter one end of the piston intermediate container until the amount of nitrogen filled into the piston intermediate container reaches the required value, then close the third on-off valve, open the first on-off valve on the air inlet pipe, and then start the constant speed and constant pressure pump to inject all the nitrogen in one end of the piston intermediate container into the reactor, so that the pressure in the reactor reaches the required pressure;

[0022] Close the first on-off valve on the air inlet pipe, start the flip control mechanism, and use the flip control mechanism to control the reactor fixing mechanism to rotate back and forth around the horizontal axis to allow the carbon dioxide and formation water core in the reactor to fully react;

[0023] Stop the control mechanism, open the first on-off valve on the exhaust pipe, discharge the residual gas in the reactor, and then open the reactor to take out the experimental core and experimental formation water.

[0024] The beneficial effects of the present invention are as follows: the water-rock reaction simulation device and the use method thereof of the present invention, the reactor is provided with an exhaust pipe, the exhaust pipe is provided with a vacuum pump, the reactor is fixed on a reactor fixing mechanism that can rotate around a horizontal axis, the vacuum pump can be used to vacuum the rock sample inside the reactor, and during the reaction process, the reactor fixing mechanism can be swung by a flip control mechanism, thereby shaking the reactor, so that the water-gas-rock in the reactor can fully react;

[0025] The present invention sets the reactor in a constant temperature box, and the reaction temperature can be controlled by the constant temperature box so that the reaction temperature of the device is equal to the actual underground environmental temperature, so that the physical property changes of the rock before and after the water-rock reaction under real conditions can be accurately tested, providing more data for reference for actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the water-rock reaction simulation device of the present invention;

[0027] Figure 2 yes Figure 1 Section view along AA;

[0028] As shown in the figure: reactor 1, constant temperature box 2, carbon dioxide cylinder 3, nitrogen cylinder 4, liquid adding tank 5, constant flow and pressure pump 6, piston intermediate container 7, vacuum pump 8, condenser 9, acid gas adsorption device 10, liquid collection pipe 11, air inlet pipe 12, exhaust pipe 13, exhaust pipe 14, first on-off valve 15, pressure sensor 16, temperature sensor 17, quick release connector 18, reactor fixing mechanism 21, horizontal axis 22, flip control mechanism 23, second on-off valve 31, third on-off valve 41, fourth on-off valve 71. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] like Figure 1 , Figure 2 As shown, the water-rock reaction simulation device of the present invention comprises a reactor 1, a thermostat 2, a carbon dioxide gas cylinder 3, a nitrogen gas cylinder 4, a liquid adding tank 5, a piston intermediate container 7, a constant flow and pressure pump 6 and a vacuum pump 8; the reactor 1 is provided with an exhaust pipe 13, a liquid taking pipe 11, an air inlet pipe 12 and an air extraction pipe 14, and the exhaust pipe 13, the liquid taking pipe 11, the air inlet pipe 12 and the air extraction pipe 14 are all provided with a first on-off valve 15; the thermostat 2 is provided with a reactor fixing mechanism 21, and the reactor fixing mechanism 21 is rotatably connected to the thermostat 2 through a horizontal axis 22, and the thermostat 2 is also provided with a flip control mechanism 23 connected to the reactor fixing mechanism 21 to control the reactor fixing mechanism 21 to rotate around the horizontal axis 22; the reactor 1 is installed in the thermostat 2 through the reactor fixing mechanism 21, and one end of the carbon dioxide cylinder 3, the nitrogen cylinder 4 and the piston intermediate container 7 are connected in parallel to the air inlet pipe 12 through the second on-off valve 31, the third on-off valve 41 and the fourth on-off valve 71 respectively, the constant flow constant pressure pump 6 is connected to the other end of the piston intermediate container 7, the vacuum pump 8 is connected to the exhaust pipe 14, and the liquid taking pipe 11 is connected to the liquid adding tank 5.

[0031] In the present invention, the exhaust pipe 14 on the reactor, the exhaust pipe 13, the liquid collection pipe 11, and the air intake pipe 12 can share the same pipe in some embodiments, for example, the exhaust pipe 13 and the air intake pipe 12 share the same pipe.

[0032] The specific method of using the water-rock reaction simulation device of the present invention is as follows:

[0033] Step 1: Place the core into the reactor 1, open the first on-off valve 15 on the exhaust pipe 14, and use the vacuum pump 8 to evacuate the reactor 1;

[0034] Step 2: After the vacuum treatment is completed, first close the first on-off valve 15 on the air extraction pipe 14 and then open the first on-off valve 15 on the liquid extraction pipe 11. Under the action of atmospheric pressure, add a certain amount of formation water into the reactor 1 through the liquid adding tank 5. The amount of formation water added is usually half of the volume of the inner cavity of the reactor and floods the core. Finally, close the first on-off valve 15 on the liquid extraction pipe 11. When adding liquid, avoid air from entering the reactor 1. The amount of formation water added can be set on the liquid adding tank 5. The scale is used to measure the reduction depth of the formation water in the liquid adding tank 5, and then calculated according to the inner cavity volume of the liquid adding tank 5.

[0035] Step 3, start the thermostat 2, set the thermostat 2 to the experimental temperature, and use the thermostat 2 to heat the reactor 1;

[0036] Step 4: After the temperature of the reactor 1 rises to the experimental temperature, first open the second on-off valve 31 and the fourth on-off valve 71 to allow the carbon dioxide in the carbon dioxide cylinder 3 to enter one end of the piston intermediate container 7, until the amount of carbon dioxide filled into the piston intermediate container 7 reaches the required value, then close the second on-off valve 31, open the first on-off valve 15 on the air inlet pipe 12, and then start the constant speed and constant pressure pump 6 to inject all the carbon dioxide in one end of the piston intermediate container 7 into the reactor 1;

[0037] Step 5: After the carbon dioxide injection is completed, first close the first on-off valve 15 on the air inlet pipe 12, and then open the third on-off valve 41, so that the nitrogen in the nitrogen bottle 4 enters one end of the piston intermediate container 7, until the amount of nitrogen filled into the piston intermediate container 7 reaches the required value, then close the third on-off valve 41, open the first on-off valve 15 on the air inlet pipe 12, and then start the constant speed and constant pressure pump 6 to inject all the nitrogen in one end of the piston intermediate container 7 into the reactor 1, so that the pressure in the reactor 1 reaches the required experimental pressure;

[0038] Step 6: close the first on-off valve 15 on the air inlet pipe 12, start the flip control mechanism 23, and use the flip control mechanism 23 to control the reactor fixing mechanism 21 to rotate back and forth around the horizontal axis 22, so that the carbon dioxide and formation water core in the reactor 1 can fully react;

[0039] Step 7: After the carbon dioxide and formation water core in the reactor 1 have fully reacted, stop the control mechanism 23, open the first on-off valve 15 on the exhaust pipe 13, discharge the residual gas in the reactor 1, and then open the reactor 1 to take out the experimental core and experimental formation water.

[0040] Finally, the experimental rock samples and experimental formation water can be inspected and analyzed.

[0041] During step 6, in order to facilitate the reaction kettle 1 to rotate back and forth with the reaction kettle fixing mechanism 21, the pipes connected to the exhaust pipe 13, the liquid collection pipe 11, the air intake pipe 12 and the exhaust pipe 14 on the reaction kettle can be removed or hoses can be used for the pipes.

[0042] The water-rock reaction simulation device of the present invention has a reactor with an exhaust pipe, on which a vacuum pump 8 is provided, and the reactor is fixed on a reactor fixing mechanism 21 which can rotate around a horizontal axis 22, and the vacuum pump 8 can be used to evacuate the rock sample inside the reactor 1, and during the reaction process, the reactor fixing mechanism 21 can be swung by a flip control mechanism 23, so that the water-gas-rock in the reactor can fully react; the present invention sets the reactor in a constant temperature box 2, and the reaction temperature can be controlled by the constant temperature box 2, so that the reaction temperature of the device is equal to the actual temperature, so that the physical property changes of the rock before and after the water-rock reaction under real conditions can be accurately tested, and more data can be provided for reference in actual production.

[0043] The present invention is also provided with a tail gas absorption system. Specifically, the tail gas absorption system comprises a condenser 9 and an acid gas adsorption device 10, and the air inlet of the acid gas adsorption device 10 is connected to the exhaust pipe 13 through the condenser 9. In this way, when the tail gas is discharged, the tail gas will first be condensed to about zero degrees through the condenser 9, so as to remove heavy hydrocarbon substances in the tail gas, and then the acid gas in the tail gas will be adsorbed and removed by the acid gas adsorption device 10 to avoid environmental pollution. In some embodiments, the tail gas absorption system adopts an activated carbon adsorption device.

[0044] like Figure 2 As shown, the flip control mechanism 23 in the present invention includes a driving motor 232 and a worm gear reducer 231, and the driving motor 232 is connected to the horizontal shaft 22 through the worm gear reducer 231. When flipping, the motor 232 is started, and the motor 232 can drive the horizontal shaft 22 and the reactor fixing mechanism 21 to rotate through the worm gear reducer 231, so as to achieve the front and back shaking of the reactor, so that the water-gas-rock in the reactor can fully react. The motor 232 is connected to the horizontal shaft 22 through the worm gear reducer 231, and the worm gear reducer 231 can be used to achieve self-locking of the position of the horizontal shaft 22, that is, to lock the position of the reactor. In some embodiments, the flip control mechanism 23 uses a cylinder or a hydraulic cylinder.

[0045] In order to facilitate understanding of the temperature and air pressure in the reactor, the reactor 1 is provided with a temperature sensor 17 for measuring the temperature in the reactor 1 and a pressure sensor 16 for measuring the air pressure in the reactor 1 .

[0046] In order to understand the concentration of anions or cations in the reactor 1 and the reaction process, the reactor 1 is also provided with an ion concentration sensor for measuring the concentration of anions or cations in the reactor 1 .

[0047] The reaction kettle fixing mechanism 21 may specifically be various existing clamping mechanisms or clamping mechanisms. Figure 2 In the embodiment, the reactor fixing mechanism 21 is a clamp locking mechanism.

[0048] In order to conveniently detect whether the reactor 1 is leaking, the connecting pipes of the reactor can be removed and a balloon can be placed on the reactor 1. In this way, if the reactor leaks, the balloon will expand.

[0049] For the convenience of connection, the exhaust pipe 13, the liquid collection pipe 11, the air intake pipe 12 and the air extraction pipe 14 are all provided with quick-release connectors 18. In this way, when connecting, the exhaust pipe 13, the liquid collection pipe 11, the air intake pipe 12 and the air extraction pipe 14 are all connected to the various connecting pipes of the device through the quick-release connectors 18, which makes the connection more convenient, and it is also convenient to remove the reactor from the connecting pipe of the device, which is convenient to increase the number of reactors, so as to facilitate the simultaneous conduct of various types of rock water-rock reaction experiments.

Claims

1. A water-rock reaction simulation device, characterized in that: The invention comprises a reaction kettle (1), a thermostat (2), a carbon dioxide gas cylinder (3), a nitrogen gas cylinder (4), a liquid adding tank (5), a piston intermediate container (7), a constant speed and constant pressure pump (6) and a vacuum pump (8); the reaction kettle (1) is provided with an exhaust pipe (13), a liquid collection pipe (11), an air inlet pipe (12) and an air extraction pipe (14); the exhaust pipe (13), the liquid collection pipe (11), the air inlet pipe (12) and the air extraction pipe (14) are all provided with a first on-off valve (15); The thermostatic box (2) is provided with a reaction kettle fixing mechanism (21), the reaction kettle fixing mechanism (21) is rotatably connected to the thermostatic box (2) via a horizontal axis (22), and the thermostatic box (2) is also provided with a flip control mechanism (23) connected to the reaction kettle fixing mechanism (21) to control the rotation of the reaction kettle fixing mechanism (21) around the horizontal axis (22); The reactor (1) is installed in a thermostatic box (2) via a reactor fixing mechanism (21); one end of the carbon dioxide cylinder (3), the nitrogen cylinder (4) and the piston intermediate container (7) are connected in parallel to the air inlet pipe (12) via a second on-off valve (31), a third on-off valve (41) and a fourth on-off valve (71), respectively; the constant speed and pressure pump (6) is connected to the other end of the piston intermediate container (7); the vacuum pump (8) is connected to the exhaust pipe (14); and the liquid collection pipe (11) is connected to the liquid adding tank (5).

2. The water-rock reaction simulation device according to claim 1, characterized in that: Also includes an exhaust gas absorption system.

3. The water-rock reaction simulation device according to claim 2, characterized in that: The tail gas absorption system comprises a condenser (9) and an acid gas adsorption device (10), and the air inlet of the acid gas adsorption device (10) is connected to an exhaust pipe (13) via the condenser (9).

4. The water-rock reaction simulation device according to claim 1, characterized in that: The flip control mechanism (23) comprises a drive motor (232) and a worm gear reducer (231), and the drive motor (232) is transmission-connected to the horizontal shaft (22) via the worm gear reducer (231).

5. The water-rock reaction simulation device according to claim 1, characterized in that: The reactor (1) is provided with a pressure sensor (16) for measuring the air pressure in the reactor (1).

6. The water-rock reaction simulation device according to claim 1 or 5, characterized in that: The reactor (1) is also provided with a temperature sensor (17) for measuring the temperature inside the reactor (1).

7. The water-rock reaction simulation device according to claim 6, characterized in that: The reactor (1) is also provided with an ion concentration sensor for measuring the anion concentration or cation concentration in the reactor (1).

8. The water-rock reaction simulation device according to claim 1, characterized in that: The reaction kettle fixing mechanism (21) is a clamp locking mechanism.

9. The water-rock reaction simulation device according to claim 1, characterized in that: The exhaust pipe (13), the liquid collection pipe (11), the air intake pipe (12) and the air extraction pipe (14) are all provided with quick-release connectors (18) for pipe connection.

10. The method for using the water-rock reaction simulation device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The core is placed in a reaction kettle (1), the first on-off valve (15) on the exhaust pipe (14) is opened, and the reaction kettle (1) is evacuated by a vacuum pump (8); After the vacuum treatment is completed, the first on-off valve (15) on the air extraction pipe (14) is closed first, and then the first on-off valve (15) on the liquid extraction pipe (11) is opened, and a certain amount of formation water is added to the reaction kettle (1) through the liquid adding tank (5), and finally the first on-off valve (15) on the liquid extraction pipe (11) is closed; Starting the thermostat (2), setting the thermostat (2) to the experimental temperature, and using the thermostat (2) to heat the reactor (1); After the temperature of the reactor (1) reaches the experimental temperature, the second on-off valve (31) and the fourth on-off valve (71) are first opened to allow the carbon dioxide in the carbon dioxide cylinder (3) to enter one end of the piston intermediate container (7), until the amount of carbon dioxide filled into the piston intermediate container (7) reaches the required value, then the second on-off valve (31) is closed, the first on-off valve (15) on the air inlet pipe (12) is opened, and then the constant speed and constant pressure pump (6) is started to inject all the carbon dioxide in one end of the piston intermediate container (7) into the reactor (1); After the carbon dioxide injection is completed, the first on-off valve (15) on the air inlet pipe (12) is closed first, and then the third on-off valve (41) is opened to allow the nitrogen in the nitrogen bottle (4) to enter one end of the piston intermediate container (7), until the amount of nitrogen filled into the piston intermediate container (7) reaches the required value, and then the third on-off valve (41) is closed, the first on-off valve (15) on the air inlet pipe (12) is opened, and then the constant speed constant pressure pump (6) is started to inject all the nitrogen in one end of the piston intermediate container (7) into the reactor (1), so that the pressure in the reactor (1) reaches the required pressure; The first on-off valve (15) on the air inlet pipe (12) is closed, and the flip control mechanism (23) is started. The flip control mechanism (23) is used to control the reaction kettle fixing mechanism (21) to rotate back and forth around the horizontal axis (22), so that the carbon dioxide and formation water core in the reaction kettle (1) are fully reacted; The control mechanism (23) is stopped, the first on-off valve (15) on the exhaust pipe (13) is opened to discharge the residual gas in the reactor (1), and then the reactor (1) is opened to take out the experimental core and experimental formation water.

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