Visual testing device for supercritical carbon dioxide rapid displacement of tight oil core
By designing a visual test device for rapid displacement of supercritical carbon dioxide in dense oil cores, the problems of high equipment costs and low extraction efficiency in the existing technology are solved, real-time monitoring and precise control are achieved, production costs are reduced and extraction efficiency is improved.
Patent Information
- Application Number
- CN202422430912.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-10-09
AI Technical Summary
The existing supercritical carbon dioxide extraction technology has the problems of high equipment costs, low efficiency, and the inability to monitor the extraction status of dense oil cores in real time, resulting in high production costs and poor extraction results.
A visual testing device for rapid displacement of supercritical carbon dioxide in dense oil cores is designed, including intermediate containers, reaction devices, separation devices and mass measurement devices. By monitoring the core mass in real time and adjusting the pressure and temperature parameters, visualization and precise control of the extraction process can be achieved.
It reduces production costs, improves the solubility and utilization of carbon dioxide, ensures the precise termination of the extraction process, avoids waste of resources, and achieves efficient extraction results.
Smart Images
Figure CN223244302U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of supercritical carbon dioxide extraction, in particular to a visual testing device for fast supercritical carbon dioxide displacement of tight oil cores. Background Art
[0002] Supercritical carbon dioxide extraction (SCCO) is an ideal extraction method due to its high extraction capacity, high extraction rate, strong selectivity, absence of harmful residues, and high product quality. However, high equipment manufacturing and operating costs, as well as low efficiency, have limited its industrial application in the extraction of active ingredients from natural products.
[0003] Under existing technical conditions, supercritical carbon dioxide extraction kettles operate intermittently, resulting in a very complex production process and difficult operation for operators, requiring highly qualified operators. Furthermore, due to the small volume and low processing capacity of the extraction kettle, production costs are high. Furthermore, in the latter half of the intermittent extraction process, the amount of material extracted decreases significantly, the solubility of carbon dioxide is extremely low, and the extraction process remains extremely unsaturated for a long time. This results in a very low carbon dioxide utilization rate, leading to extremely low and unreasonable equipment utilization, which in turn increases production costs. Furthermore, existing supercritical carbon dioxide extraction techniques cannot display the extraction status of tight oil in the core in real time, often resulting in an excessively long extraction process or insufficient extraction time, making it impossible for operators to intuitively terminate the extraction process. Furthermore, existing techniques have also been found to judge the extraction accuracy by making the reactor transparent and visually observing the extraction process. This method is clearly neither objective nor accurate, as tight cores are not transparent. Operators can only judge based on the morphology and color of the supercritical carbon dioxide and macroscopic changes on the core surface, and cannot accurately understand the real-time dynamics of the rapid supercritical carbon dioxide displacement in tight oil cores. Summary of the Invention
[0004] In response to the above defects or improvement needs of the existing technology, the utility model provides a visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores, which realizes the visual display of supercritical carbon dioxide rapid displacement of tight oil cores.
[0005] The technical solution of the utility model is:
[0006] A visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores comprises an intermediate container, a reaction device and a separation device connected in sequence; the inlet end of the intermediate container is connected to a pressurized gas input device; the reaction device has a saturated oil core built in, and the reaction device is also connected to a pressure regulating device and a temperature control device; a mass measuring device is also provided at the bottom of the saturated oil core; and an external computer is also included, and the mass measuring device is electrically connected to the external computer.
[0007] The mass measuring device is a BCL-300GM-A micro-range weighing sensor, which is electrically connected to an external computer.
[0008] The system further comprises a circulation pipeline, wherein the inlet end of the circulation pipeline is connected to the outlet end of the separation device, and the outlet end of the circulation pipeline is connected to the pressurized gas input device.
[0009] The reaction device is a reactor; the reactor is provided with an inlet pipe and an outlet pipe; the pressure regulating device includes an inlet pressure regulating device and an outlet pressure regulating device; the inlet pressure regulating device includes a first confining pressure pump and a first back-pressure valve arranged on the inlet pipe, and the outlet pressure regulating device includes a second confining pressure pump and a second back-pressure valve arranged on the outlet pipe; wherein, the first confining pressure pump and the second confining pressure pump are located outside the constant temperature device, and the first back-pressure valve and the second back-pressure valve are located inside the constant temperature device; the second back-pressure valve is also connected to the inlet end of the separation device.
[0010] The pressurized gas input device includes a carbon dioxide cylinder, a carbon dioxide storage tank and a carbon dioxide booster pump connected in sequence, and the carbon dioxide booster pump is connected to an intermediate container; it also includes a condensing device; the carbon dioxide storage tank is located in the condensing device; the outlet end of the circulation pipeline is connected to the carbon dioxide storage tank.
[0011] The carbon dioxide storage tank is provided with a carbon dioxide inlet pipe and a carbon dioxide outlet pipe; a first pressure regulating valve is provided on the carbon dioxide inlet pipe, and a second pressure regulating valve is provided on the carbon dioxide outlet pipe; the first pressure regulating valve and the second pressure regulating valve are both located outside the condensing device; a third pressure regulating valve is provided on the pipe between the carbon dioxide booster pump and the intermediate container.
[0012] The intermediate container is also connected to a submersible pump.
[0013] The circulation pipeline is provided with a circulation pump, a fourth pressure regulating valve and a one-way valve.
[0014] The constant temperature device is a constant temperature box, the condensing device is a condensing box, the separating device is a separator, the inlet end of the separator is connected to the second back pressure valve, and the outlet end of the separator is connected to the circulation pipeline.
[0015] The technical effects of the utility model are:
[0016] The utility model has a simple structure and low operation difficulty, and at the same time, the solubility and utilization rate of carbon dioxide are high, thereby reducing production costs. In addition, the mass of the saturated oil core is weighed in real time by a mass weighing device and transmitted to an external computer, so that the staff can accurately understand the real-time dynamics of the saturated oil core during rapid displacement by supercritical carbon dioxide, and can adjust the pressure and temperature parameters in the extraction and flooding process in real time according to the extraction effect to achieve better extraction and flooding effects. By being able to accurately terminate the extraction process, waste of resources is avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Schematic diagram of the structure of the visual test device for supercritical carbon dioxide rapid displacement of tight oil cores.
[0018] Figure numerals: 1. Carbon dioxide cylinder; 2. Condensation tank; 3. Carbon dioxide storage tank; 4. Carbon dioxide booster pump; 5. Intermediate container; 6. Submersible drive pump; 7. First confining pressure pump; 8. First back pressure valve; 9. Constant temperature box; 10. Reactor; 11. Second back pressure valve; 13. Second confining pressure pump; 14. Separation device; 15. First pressure regulating valve; 16. Circulation pump; 17. Circulation pipeline; 18. Second pressure regulating valve; 19. Third pressure regulating valve; 20. Fourth pressure regulating valve; 21. Mass measurement device; 24. External computer. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
[0020] Example 1
[0021] A visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores includes an intermediate container 5, a reaction device and a separation device 14 connected in sequence; the inlet end of the intermediate container 5 is connected to a pressurized gas input device; the reaction device has a saturated oil core built in, and the reaction device is also connected to a pressure regulating device and a temperature control device; a mass measuring device 21 is also provided at the bottom of the saturated oil core; and an external computer 24 is also included, and the mass measuring device 21 is electrically connected to the external computer 24.
[0022] The specific implementation process of this embodiment is as follows:
[0023] An oil-saturated core is placed in a reaction device, and the mass M1 of the oil-saturated core is measured by a mass measuring device 21. Supercritical carbon dioxide gas provided by a pressurized gas input device is introduced into the reaction device through an intermediate container 5. The pressure in the reaction device is adjusted to a constant target experimental pressure by a pressure regulating device, and the temperature in the reaction device is adjusted to a constant target experimental temperature by a temperature control device to conduct an extraction oil recovery experiment.
[0024] During the extraction oil recovery experiment, the mass of the oil-saturated core was measured in real time by the mass measuring device 21 and transmitted to the external computer 24, so that the staff could accurately understand the real-time dynamics of the oil-saturated core during the rapid displacement of supercritical carbon dioxide;
[0025] After the extraction experiment, the post-extraction core mass M2 was measured using mass measurement device 21. The crude oil extraction yields under different experimental conditions were then calculated based on the oil-saturated core mass M1 and the post-extraction core mass M2. The pressure within the reaction unit was reduced to zero, and the supercritical carbon dioxide gas was converted into carbon dioxide gas. The small amount of light crude oil components extracted in the gaseous phase during the extraction experiment and the carbon dioxide gas were separated in separation device 14. The liquefied light crude oil components remained in separation device 14, and the carbon dioxide gas was discharged through separation device 14.
[0026] Example 2
[0027] On the basis of Example 1, the present invention further comprises: the mass measuring device 21 is a BCL-300GM-A micro-range weighing sensor, which is electrically connected to an external computer 24 .
[0028] Example 3
[0029] The present invention further comprises a circulation pipeline 17, the inlet of which is connected to the outlet of the separation device 14, and the outlet of which is connected to the pressurized gas input device. The circulation pipeline 17 is provided with a circulation pump 16, a fourth pressure regulating valve 20, and a one-way valve. The carbon dioxide gas separated by the separation device 14 is pressurized again by the circulation pump 16, converted into supercritical carbon dioxide gas, and then reinjected into the pressurized gas input device for reuse.
[0030] Example 4
[0031] On the basis of Example 3, it also includes: the reaction device is a reactor 10; the reactor 10 is provided with an inlet pipe and an outlet pipe; the pressure regulating device includes an inlet pressure regulating device and an outlet pressure regulating device; the inlet pressure regulating device includes a first confining pressure pump 7 and a first back pressure valve 8 arranged on the inlet pipe, and the outlet pressure regulating device includes a second confining pressure pump 13 and a second back pressure valve 11 arranged on the outlet pipe; wherein, the first confining pressure pump 7 and the second confining pressure pump 13 are located outside the constant temperature device, and the first back pressure valve 8 and the second back pressure valve 11 are located inside the constant temperature device; the second back pressure valve 11 is also connected to the inlet end of the separation device 14.
[0032] Example 5
[0033] Based on Example 4, the invention further comprises: the pressurized gas input device comprises a CO2 cylinder 1, a CO2 storage tank 3, and a CO2 booster pump 4 connected in sequence, with the CO2 booster pump 4 connected to an intermediate container 5; a condensing device is also included; the CO2 storage tank 3 is located within the condensing device; the outlet end of the circulation pipeline 17 is connected to the CO2 storage tank 3; the CO2 storage tank 3 is provided with a CO2 inlet pipeline and a CO2 outlet pipeline; the CO2 inlet pipeline is provided with a first pressure regulating valve 15, and the CO2 outlet pipeline is provided with a second pressure regulating valve 18; both the first pressure regulating valve 15 and the second pressure regulating valve 18 are located outside the condensing device; a third pressure regulating valve 19 is provided on the pipeline between the CO2 booster pump 4 and the intermediate container 5; and the intermediate container 5 is also connected to a submersible pump 6.
[0034] Example 6
[0035] On the basis of Example 5, it also includes: the constant temperature device is a constant temperature box 9, the condensing device is a condensing box 2, the separating device 14 is a separator, the inlet end of the separator is connected to the second back pressure valve 11, and the outlet end of the separator is connected to the circulation pipe 17.
[0036] The specific implementation process of this embodiment is as follows:
[0037] First, the oil-saturated core is placed in a cone-bottom core cup and placed in a reactor 10. The initial mass M1 of the oil-saturated core is measured by a mass measuring device 21 and transmitted to an external computer 24.
[0038] Then, the carbon dioxide gas provided by the carbon dioxide cylinder 1 is pressurized by the carbon dioxide storage tank 3 and the carbon dioxide booster pump 4 to form supercritical carbon dioxide gas, which then enters the intermediate container 5. The submersible pump 6 then provides power to the intermediate container 5 to pass the supercritical carbon dioxide gas into the reactor 10; the temperature of the thermostat 9 is adjusted to a constant target experimental temperature; the pressure in the reactor 10 is set to a constant target experimental pressure through the inlet pressure regulating device and the outlet pressure regulating device, so that the immersion pressure in the reactor 10 is stabilized at the constant target experimental pressure; then, by closing the first back-pressure valve 8 and the second back-pressure valve 11, an extraction oil recovery experiment is performed on the oil-saturated core in the reactor 10 until the extraction oil recovery experiment is completed;
[0039] During the extraction oil recovery experiment, the real-time mass of the oil-saturated core is measured by the mass measuring device 21 and transmitted to the external computer 24, so that the staff can accurately understand the real-time dynamics of the oil-saturated core during the rapid displacement of supercritical carbon dioxide;
[0040] After the extraction oil recovery experiment is completed, the mass M2 of the extracted core is measured by the mass measuring device 21; and then the crude oil extraction rate under different experimental conditions is calculated based on the initial mass M1 of the oil-saturated core and the mass M2 of the extracted core;
[0041] The second back-pressure valve 11 is opened to reduce the internal pressure of the reactor 10, thereby destroying the supercritical state of the supercritical carbon dioxide gas and forming carbon dioxide gas. A small amount of light components of crude oil and carbon dioxide gas extracted in the gaseous form during the oil extraction experiment enter the separator for separation, and the liquefied light components of crude oil are retained in the separator. The carbon dioxide gas is pressurized through the circulation pipeline 17 to form supercritical carbon dioxide gas and is re-injected into the carbon dioxide storage tank 3 for reuse.
[0042] Specific experimental cases
[0043] First, the oil-saturated core is placed in a cone-bottom core cup and placed in a reactor 10. The initial mass M1 of the oil-saturated core is measured by a mass measuring device 21 and transmitted to an external computer 24.
[0044] Then, the carbon dioxide gas provided by the carbon dioxide cylinder 1 is pressurized to 20 MPa by the carbon dioxide storage tank 3 and the carbon dioxide booster pump 4 in sequence to form supercritical carbon dioxide gas, which then enters the intermediate container 5. The submersible pump 6 then provides power to the intermediate container 5 to pass the supercritical carbon dioxide gas into the reactor 10; the temperature of the thermostat 9 is adjusted to a constant target experimental temperature of 45° C.; the pressure in the reactor 10 is set to a constant target experimental pressure of 20 MPa through the inlet pressure regulating device and the outlet pressure regulating device, so that the immersion pressure in the reactor 10 is stabilized at the constant target experimental pressure of 20 MPa; then, by closing the first back-pressure valve 8 and the second back-pressure valve 11, an extraction oil recovery experiment is performed on the oil-saturated core in the reactor 10 until the extraction oil recovery experiment is completed;
[0045] During the extraction oil recovery experiment, the real-time mass of the oil-saturated core is measured by the mass measuring device 21 and transmitted to the external computer 24, so that the staff can accurately understand the real-time dynamics of the oil-saturated core during the rapid displacement of supercritical carbon dioxide;
[0046] After the extraction oil recovery experiment is completed, the mass M2 of the extracted core is measured by the mass measuring device 21; and then the crude oil extraction rate under different experimental conditions is calculated based on the initial mass M1 of the oil-saturated core and the mass M2 of the extracted core;
[0047] The second back-pressure valve 11 is opened to reduce the internal pressure of the reactor 10, thereby destroying the supercritical state of the supercritical carbon dioxide gas and forming carbon dioxide gas. A small amount of light components of crude oil and carbon dioxide gas extracted in the gaseous form during the extraction oil production experiment enter the separator for separation, and the liquefied light components of crude oil are retained in the separator. The carbon dioxide gas is pressurized to 20 MPa through the circulation pipeline 17 to form supercritical carbon dioxide gas and is re-injected into the carbon dioxide storage tank 3 for reuse.
[0048] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.
Claims
1. A visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores, comprising an intermediate container (5), a reaction device, and a separation device (14) connected in sequence; the inlet end of the intermediate container (5) is connected to a pressurized gas input device; and is characterized in that: The reaction device has an oil-saturated core built in, and is also connected to a pressure regulating device and a temperature control device; a mass measuring device (21) is also provided at the bottom of the oil-saturated core; and an external computer (24) is also included, and the mass measuring device (21) is electrically connected to the external computer (24).
2. The visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores according to claim 1 is characterized by: The mass measuring device (21) is a BCL-300GM-A micro-range weighing sensor, which is electrically connected to an external computer (24).
3. The visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores according to claim 1 is characterized by: The invention also comprises a circulation pipeline (17), wherein the inlet end of the circulation pipeline (17) is connected to the outlet end of the separation device (14), and the outlet end of the circulation pipeline (17) is connected to the pressurized gas input device.
4. The visual testing device for supercritical carbon dioxide rapid flooding of tight oil cores according to claim 3 is characterized by: The reaction device is a reactor (10); the reactor (10) is provided with an inlet pipe and an outlet pipe; the pressure regulating device includes an inlet pressure regulating device and an outlet pressure regulating device; the inlet pressure regulating device includes a first confining pressure pump (7) and a first back pressure valve (8) arranged on the inlet pipe, and the outlet pressure regulating device includes a second confining pressure pump (13) and a second back pressure valve (11) arranged on the outlet pipe; wherein, the first confining pressure pump (7) and the second confining pressure pump (13) are located outside the constant temperature device, and the first back pressure valve (8) and the second back pressure valve (11) are located inside the constant temperature device; the second back pressure valve (11) is also connected to the inlet end of the separation device (14).
5. The visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores according to claim 4, characterized in that: The pressurized gas input device comprises a carbon dioxide gas cylinder (1), a carbon dioxide storage tank (3) and a carbon dioxide booster pump (4) connected in sequence, wherein the carbon dioxide booster pump (4) is connected to an intermediate container (5); and further comprises a condensing device; the carbon dioxide storage tank (3) is located in the condensing device; and the outlet end of the circulation pipe (17) is connected to the carbon dioxide storage tank (3).
6. The visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores according to claim 5, characterized in that: The carbon dioxide storage tank (3) is provided with a carbon dioxide inlet pipeline and a carbon dioxide outlet pipeline; a first pressure regulating valve (15) is provided on the carbon dioxide inlet pipeline, and a second pressure regulating valve (18) is provided on the carbon dioxide outlet pipeline; the first pressure regulating valve (15) and the second pressure regulating valve (18) are both located outside the condensing device; and a third pressure regulating valve (19) is provided on the pipeline between the carbon dioxide booster pump (4) and the intermediate container (5).
7. The visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores according to claim 6, characterized in that: The intermediate container (5) is also connected to a submersible pump (6).
8. The visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores according to claim 7, characterized in that: The circulation pipeline (17) is provided with a circulation pump (16), a fourth pressure regulating valve (20) and a one-way valve.
9. The visual testing device for supercritical carbon dioxide rapid displacement of tight oil cores according to claim 8, characterized in that: The constant temperature device is a constant temperature box (9), the condensing device is a condensing box (2), and the separating device (14) is a separator. The inlet end of the separator is connected to the second back pressure valve (11), and the outlet end of the separator is connected to the circulation pipeline (17).