Rock sample corrosion reaction test device

Abstract

The utility model aims to provide a rock sample corrosion reaction test device, the test device comprises a corrosion reaction system, the corrosion reaction system comprises an oil bath thermotank and a high-pressure constant-current infusion pump, a first preheating device and a second preheating device are placed in the oil bath thermotank, and the high-pressure constant-current infusion pump is arranged in the oil bath thermotank. An acid-base measuring assembly is mounted on the first preheating device, and a sample testing device is mounted on the second preheating device; wherein the high-pressure constant-current liquid conveying pump is used for sucking a gas-liquid mixture which is preheated in the first preheating device and is subjected to pH value detection and conveying the gas-liquid mixture into the second preheating device and the sample testing device. The utility model relates to the technical field of corrosion tests, adopts the design of double test bins, and can synchronously apply test environment conditions with equal pH value, equal temperature, equal pressure and different equal flow velocities to rock samples in the two test bins. After the first sample testing bin and the second sample testing bin are connected into a whole through the connecting flange, mutual temperature transition is easier.

Description

Technical Field

[0001] The utility model relates to the technical field of dissolution testing, in particular to a rock sample dissolution reaction testing device. Background Art

[0002] In the dissolution experiment of carbonate rocks under simulated formation conditions, the dissolution reaction test is to simulate the hydrochemical kinetic parameters and microstructural dissolution characteristics of carbonate rocks under different environmental conditions such as flow rate, temperature, acidity, alkali, and pressure.

[0003] During the test, CO2 gas and aqueous solution are mixed and their pH values ​​are monitored before being transported to the reaction chamber. After a certain period of time, the effect on the specimen is checked. Among them, the main test methods are the effect on the specimen at different flow rates, the effect on the specimen at different temperatures, or the effect on the specimen under the application of solutions with different pH values.

[0004] The impact of different conditions on the test piece can be compared through the values ​​recorded in each test. In multiple tests, if you want to adjust another environmental condition while keeping one environmental condition unchanged during each test, it is impossible to ensure that one environmental condition remains unchanged. For example, when you want to test a gas-liquid mixture with the same pH value at different flow rates at the same temperature, due to objective factors such as the equipment itself and the test environment, it cannot be guaranteed that the pH value from the beginning to the end of the two tests is exactly the same. At the same time, it cannot be guaranteed that the temperature value change process and the temperature maintenance process from the beginning to the end of the two tests are exactly the same. Therefore, there will be slight errors in the test results. Although the error value is within the tolerable error, it will still affect the test results. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a rock sample dissolution reaction test device, which solves the problem that errors are easily caused by performing two tests on two groups of test pieces when the prior rock sample dissolution reaction test device performs tests with the same pH value, the same temperature, the same pressure and different flow rates.

[0006] To achieve the above object, the utility model is implemented by the following technical scheme: a rock sample dissolution reaction test device, the test device includes a dissolution reaction system, the dissolution reaction system includes:

[0007] An oil bath thermostat, wherein a first preheating device and a second preheating device are placed in the oil bath thermostat, an acid-base measuring component is installed on the first preheating device, and a sample testing device is installed on the second preheating device;

[0008] A high-pressure constant-current infusion pump is arranged outside the oil bath thermostat, and the first preheating device and the second preheating device are respectively connected to the liquid inlet port and the liquid outlet port of the high-pressure constant-current infusion pump;

[0009] The high-pressure constant-current infusion pump sucks the gas-liquid mixture after preheating and pH value detection in the first preheating device and transports it to the second preheating device and the sample testing device.

[0010] Preferably, the acid-base measuring assembly comprises a measuring tank connected to the first preheating device, and a pH meter is installed in the measuring tank.

[0011] Preferably, the sample testing device includes a testing chamber connected to the second preheating device, and the testing chamber includes a first sample testing chamber and a second sample testing chamber; wherein the gas-liquid mixture output by the high-pressure constant-current infusion pump at a constant flow rate can be transported to the first sample testing chamber and the second sample testing chamber, respectively.

[0012] Preferably, the bottom of the first sample testing chamber is connected to the second sample testing chamber via a connecting flange;

[0013] The top of the first sample test chamber is connected with a liquid inlet pipe, the wall of the connecting flange is provided with a liquid inlet cavity connected with the second sample test chamber, and the second preheating device is respectively connected with the liquid inlet pipe and connected with the liquid inlet cavity through a water inlet branch pipe;

[0014] The bottom of the second sample test chamber is connected with a liquid outlet pipe, the wall of the connecting flange is provided with a liquid outlet cavity connected with the first sample test chamber, the wall interface of the liquid outlet cavity is connected with a liquid outlet branch pipe, and the liquid outlet branch pipe is connected with the liquid outlet pipe.

[0015] Preferably, flow control valves are installed on both the liquid inlet pipe and the water inlet branch pipe.

[0016] Preferably, the upper and lower end surfaces of the connecting flange are both provided with sealing sections, and the first sample test chamber and the second sample test chamber are both against the sealing sections.

[0017] Preferably, the test device further comprises a carbonated water preparation system and a solution receiving system;

[0018] The carbonated water preparation system comprises a gas-liquid micro-mixer and a liquid supply pipeline and a gas supply pipeline connected to the gas-liquid micro-mixer;

[0019] The solution receiving system comprises a condensing device and a gas-liquid separator connected to the condensing device.

[0020] Preferably, the gas supply pipeline is connected to a CO2 high-pressure cylinder, and the liquid supply pipeline is connected to a clean water tank. Beneficial Effects

[0021] Compared with the prior art, the rock sample dissolution reaction test device provided by the utility model has the following improvements and advantages:

[0022] First, two preheating devices, the first preheating device and the second preheating device, are provided, so that the gas-liquid mixture can be uniformly heat-exchanged for a long time to reach the same constant temperature as that set in the oil bath thermostat. In addition, the measuring tank and the sample testing device are separately arranged on the first preheating device and the second preheating device, so that the constant flow gas-liquid mixture output by the high-pressure constant flow infusion pump can be directly delivered to the sample testing device to ensure stable delivery.

[0023] Secondly, the dual test chamber design can simultaneously apply the same pH value, temperature, pressure and different flow rate test environment conditions to the rock samples in the two test chambers. In this process, after the first sample test chamber and the second sample test chamber are connected into one through the connecting flange, the temperature between them is easier to transfer, which can ensure the temperature between the two to the greatest extent and ensure the test effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the measuring tank of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the sample testing device of the utility model;

[0027] Figure 4 This is a schematic diagram of the connecting flange structure of the utility model;

[0028] Figure 5 For this utility model Figure 3 Top view.

[0029] Explanation of symbols in the figure

[0030] 1. Liquid supply pipeline, 2. Gas supply pipeline, 3. Gas-liquid micro-mixer, 4. High-pressure constant-current infusion pump, 5. Condensation device, 6. Gas-liquid separator, 7. Measuring tank, 8. First preheating device, 9. Oil bath thermostat, 10. Second preheating device, 11. Sample testing device, 111. Water inlet branch pipe, 112. Liquid inlet cavity, 113. Flow control valve, 114. Liquid inlet pipe, 115. First sample testing chamber, 116. Connecting flange, 117. Liquid outlet cavity, 118. Liquid outlet branch pipe, 119. Liquid outlet pipe, 120. Second sample testing chamber, 12. pH meter, 13. Sealing section. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. As long as the effect of the utility model can be exerted, various changes can be made to the implementation scheme.

[0032] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in the art. The following mainly introduces the working principle and process.

[0033] Reference Figure 1-5 This embodiment of the present invention will be described.

[0034] A rock sample dissolution reaction test device, the test device comprises a dissolution reaction system, the dissolution reaction system comprises:

[0035] An oil bath thermostat 9, in which a first preheating device 8 and a second preheating device 10 are placed, both of which are disc-shaped stainless steel tubes, an acid-base measuring component is installed on the first preheating device 8, and a sample testing device 11 is installed on the second preheating device 10;

[0036] The high-pressure constant-current infusion pump 4 is arranged outside the oil bath thermostat 9, and the first preheating device 8 and the second preheating device 10 are respectively connected to the liquid inlet port and the liquid outlet port of the high-pressure constant-current infusion pump 4;

[0037] The high-pressure constant-current infusion pump 4 draws the gas-liquid mixture after preheating and pH value detection in the first preheating device 8 and delivers it to the second preheating device 10 at a constant flow rate for further preheating and then enters the sample testing device 11 .

[0038] The acid-base measurement assembly includes a measuring tank 7 connected to the first preheating device 8, and a pH meter 12 is installed in the measuring tank 7. After the gas-liquid mixture enters the first preheating device 7, its acid-base value is detected by the pH meter 12. The gas content in the gas-liquid mixture can be appropriately increased or decreased to achieve the required pH value of the experiment.

[0039] like Figure 3 As shown, in this embodiment, the sample testing device 11 is refined. In this embodiment, the sample testing device 11 is made entirely of stainless steel;

[0040] The sample testing device 11 includes a testing chamber connected to the second preheating device 10, and the testing chamber includes a first sample testing chamber 115 and a second sample testing chamber 120; wherein the gas-liquid mixture output by the high-pressure constant-current infusion pump 4 at a constant flow rate can be transported to the first sample testing chamber 115 and the second sample testing chamber 120 respectively.

[0041] The dual test chamber design allows for simultaneous testing of rock samples in two test chambers under different environmental conditions to observe water chemical kinetic parameters and dissolution characteristics of microstructures.

[0042] For example, the corrosion characteristics under the environmental conditions of the same pressure, the same temperature, the same pH value, and different flow rates can be implemented. To achieve the above purpose, different liquid inflow volumes of the first sample test chamber 115 and the second sample test chamber 120 can be adjusted under the conditions of applying the same pressure, the same temperature, and the same pH value.

[0043] In one embodiment, the first sample test chamber 115 and the second sample test chamber 120 are independent test chambers, and the second preheating device 10 is connected to the two test chambers through two branch pipes. To improve the use stability of the two test chambers, the two test chambers can be fixed together, for example, the bottom of the first sample test chamber 115 is connected to the second sample test chamber 120 through a connecting flange 116;

[0044] In another embodiment, the bottom of the first sample test chamber 115 is connected to the second sample test chamber 120 via a connecting flange 116, and at the same time, a liquid inlet pipe 114 is connected to the top of the first sample test chamber 115, and a liquid inlet cavity 112 connected to the second sample test chamber 120 is opened on the wall of the connecting flange 116, and the second preheating device 10 is respectively connected to the liquid inlet pipe 114 and to the liquid inlet cavity 112 via a water inlet branch pipe 111; a liquid outlet pipe 119 is connected to the bottom of the second sample test chamber 120, and a liquid outlet cavity 117 connected to the first sample test chamber 115 is opened on the wall of the connecting flange 116, and a liquid outlet branch pipe 118 is connected to the wall interface of the liquid outlet cavity 117, and the liquid outlet branch pipe 118 is connected to the liquid outlet pipe 119. In this embodiment, two cavities are opened in the connecting flange 116, namely, the liquid inlet cavity 112 and the liquid outlet cavity 117. The gas-liquid mixture preheated by the second preheating device 10 is connected to the liquid inlet pipe 114 and the water inlet branch pipe 111 through the first three-way connection. The liquid inlet pipe 114 is connected to the first sample test chamber 115, and the water inlet branch pipe 111 is connected to the liquid inlet cavity 112. At the same time, the flow control valve 113 is installed on the liquid inlet pipe 114 and the water inlet branch pipe 111 to adjust the liquid inlet amount. It should be noted that the total amount of liquid inlet pipe 114 and water inlet branch pipe 111 must be equal to the total output of the high-pressure constant current infusion pump 4. The liquid outflow of the first sample test chamber 115 flows into the liquid outlet branch pipe 118 through the liquid outlet cavity 117, and the liquid in the second sample test chamber 120 flows out through the liquid outlet pipe 119. At the same time, the liquid outlet branch pipe 118 and the liquid outlet pipe 119 are finally merged through a second three-way pipe, and then connected to the condensing device 5 through a stainless steel pipe.

[0045] By adopting the design of the connecting flange 116, the bottom flange of the first sample test chamber 115 and the top flange of the second sample test chamber 120 are first replaced with a single connecting flange, thereby reducing the space occupied by the sample test device 11 in the oil bath thermostatic box 9, making it easier to place the sample test device 11; at the same time, after the first sample test chamber 115 and the second sample test chamber 120 are connected into one body through the connecting flange, the temperature between them is easier to transfer, which can ensure that the temperature between the two is the same to the greatest extent.

[0046] The upper and lower end surfaces of the connecting flange 116 are both provided with sealing sections 13, and the first sample test chamber 115 and the second sample test chamber 120 are both against the sealing sections 13. A sealing ring can be installed at the outer edge of the sealing section 13 to increase the sealing effect of the first sample test chamber 115 and the second sample test chamber 120 on the connecting flange 116.

[0047] The test apparatus also includes a carbonated water preparation system and a solution receiving system;

[0048] The carbonated water preparation system includes a gas-liquid micro-mixer 3 and a liquid supply pipeline 1 and a gas supply pipeline 2 connected to the gas-liquid micro-mixer 3; the gas supply pipeline 2 is connected to a CO2 high-pressure cylinder, and the liquid supply pipeline 1 is connected to a clean water tank.

[0049] The solution receiving system includes a condensing device 5 and a gas-liquid separator 6 connected to the condensing device 5 .

[0050] In this embodiment, a gas-liquid micro-mixer 3 is provided, and a microchannel is used for gas-liquid dispersion and reaction intensification, where the liquid is mixed with CO2 gas, and the micro-mixing technology is used to ensure that CO2 and the aqueous solution are quickly and fully mixed to form a carbonated aqueous solution with stable solubility. The liquid temperature is lowered by a condensing device, and the temperature of the solution after passing through the sample is brought to below 80°C, which can prevent excessive temperature from damaging subsequent test devices.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rock sample dissolution reaction test device, the test device comprising a dissolution reaction system, characterized in that: The dissolution reaction system comprises: An oil bath thermostatic box (9), wherein a first preheating device (8) and a second preheating device (10) are placed in the oil bath thermostatic box (9), an acid-base measuring component is installed on the first preheating device (8), and a sample testing device (11) is installed on the second preheating device (10); A high-pressure constant-current infusion pump (4) is arranged outside the oil bath thermostatic box (9), and the first preheating device (8) and the second preheating device (10) are respectively connected to the liquid inlet port and the liquid outlet port of the high-pressure constant-current infusion pump (4); The high-pressure constant-current infusion pump (4) sucks the gas-liquid mixture preheated and tested for pH in the first preheating device (8) and delivers it to the second preheating device (10) and the sample testing device (11).

2. A rock sample dissolution reaction test device according to claim 1, characterized in that: The acid-base measurement assembly comprises a measuring tank (7) connected to a first preheating device (8), wherein a pH meter (12) is installed in the measuring tank (7).

3. A rock sample dissolution reaction test device according to claim 1, characterized in that: The sample testing device (11) comprises a testing chamber connected to the second preheating device (10), wherein the testing chamber comprises a first sample testing chamber (115) and a second sample testing chamber (120); wherein the gas-liquid mixture outputted at a constant flow rate by the high-pressure constant flow infusion pump (4) can be transported to the first sample testing chamber (115) and the second sample testing chamber (120), respectively.

4. A rock sample dissolution reaction test device according to claim 3, characterized in that: The bottom of the first sample testing chamber (115) is connected to the second sample testing chamber (120) via a connecting flange (116); The top of the first sample test chamber (115) is connected to a liquid inlet pipe (114), the wall of the connecting flange (116) is provided with a liquid inlet cavity (112) connected to the second sample test chamber (120), and the second preheating device (10) is respectively connected to the liquid inlet pipe (114) and to the liquid inlet cavity (112) via a water inlet branch pipe (111); The bottom of the second sample test chamber (120) is connected to a liquid outlet pipe (119), the wall of the connection flange (116) is provided with a liquid outlet cavity (117) connected to the first sample test chamber (115), the wall interface of the liquid outlet cavity (117) is connected to a liquid outlet branch pipe (118), and the liquid outlet branch pipe (118) is connected to the liquid outlet pipe (119).

5. A rock sample dissolution reaction test device according to claim 4, characterized in that: A flow control valve (113) is installed on both the liquid inlet pipe (114) and the water inlet branch pipe (111).

6. A rock sample dissolution reaction test device according to claim 4, characterized in that: The upper and lower end surfaces of the connecting flange (116) are both provided with sealing sections (13), and the first sample test chamber (115) and the second sample test chamber (120) are both in contact with the sealing sections (13).

7. A rock sample dissolution reaction test device according to claim 1, characterized in that: The test device also includes a carbonated water preparation system and a solution receiving system; The carbonated water preparation system comprises a gas-liquid micro-mixer (3) and a liquid supply pipeline (1) and a gas supply pipeline (2) connected to the gas-liquid micro-mixer (3); The solution receiving system comprises a condensing device (5) and a gas-liquid separator (6) connected to the condensing device (5).

8. A rock sample dissolution reaction test device according to claim 7, characterized in that: The gas supply pipeline (2) is connected to a CO2 high-pressure cylinder, and the liquid supply pipeline (1) is connected to a clean water tank.

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