Rock core displacement device

Abstract

The utility model discloses a rock core displacement device which comprises a micro pump and a container set installed on the left side of the micro pump, a microscope is arranged on the right side of the container set, a microscopic model is arranged on the lower side of the microscope, and a data processor is arranged on the right side of the microscopic model. A suction port is fixedly connected to the outer wall of the right end of the microscopic model close to the upper side so as to be connected with an external vacuum pump, a fixing head is fixedly connected to the outer wall of the right end of the microscopic model close to the lower side, and a connector is screwed to the circular outer wall of the fixing head. When the gas in the micropore model circulates, the thin film which is originally in a contraction state between the fixing ring a and the fixing ring b becomes swelled, which means that the gas circulates, and the condition that the gas circulates in the micropore model can be judged by observing the state of the thin film, so that the condition that the gas enters the micropore model can be found in time.

Description

Technical Field

[0001] The utility model belongs to the technical field related to core displacement experiments, and in particular relates to a core displacement device. Background Art

[0002] Micro-etching displacement experiments were carried out to clarify the occurrence state and startup mode of residual oil, and to reveal the spatial distribution of residual oil formed by different displacement media in microscopic pores and its influencing factors. At the same time, one-dimensional physical simulation displacement experiments were carried out to determine the influence of different permeabilities, water contents, etc. on the displacement effect, laying the foundation for establishing a composite displacement enhancement map. Two-dimensional flat plate displacement experiments were carried out to quantify the sweep effects of different displacement stages and the influence of transition streamlines on enhancing the recovery factor. However, when the microscopic model was vacuum-extracted, a gap existed between the connector and the fixed head due to cleaning and repeated fixation of the connector for conveying and discharging the medium, resulting in gas circulation inside the microscopic model, which affected the microscopic model in a vacuum state and made the void fluid in the microscopic model unable to flow stably. Utility Model Content

[0003] The utility model aims to provide a core displacement device to solve the problem in the above background technology that due to cleaning and repeated fixing of the connector for conveying and discharging the medium, there is a gap between the connector and the fixing head, which leads to gas circulation inside the microscopic model.

[0004] To achieve the above object, the utility model provides the following technical solutions: a core displacement device, comprising a micro pump and a container group installed on the left side of the micro pump;

[0005] A microscope is provided on the right side of the container group;

[0006] A microscopic model is provided on the lower side of the microscope;

[0007] A data processor is provided on the right side of the microscopic model, a suction port is fixedly connected to the upper side of the outer wall of the right end of the microscopic model to connect with an external vacuum pump, a fixed head is fixedly connected to the lower side of the outer wall of the right end of the microscopic model, and a connector is screwed on the circular outer wall of the fixed head;

[0008] A leak-proof pad is arranged between the connecting head and the fixed head, a fixing ring a is fixedly connected to the leftmost side of the circular outer wall of the fixed head, a fixing ring b is screwed on the circular outer wall of the connecting head near the left side, and a film is fixedly connected between the fixing rings a and b.

[0009] Preferably, a support plate is fixedly connected between the fixing ring a and the fixing ring b and located at the lower side of the film to maintain the surface tension of the film, and a plurality of vertical through-holes are equidistantly opened inside the upper outer wall of the support plate to allow gas to circulate and control the state of the film.

[0010] Preferably, threads are provided on the circular inner wall at the lower end of the fixing ring b and the circular outer wall of the connector, and the two threads are screwed together to limit the position between the fixing ring b and the connector.

[0011] Preferably, the film is attached to the surface of the support plate when there is no air between the fixing ring a and the fixing ring b, and the film is away from the surface of the support plate when there is air between the fixing ring a and the fixing ring b.

[0012] Preferably, a delivery pipeline a is fixedly connected between the micro pump and the container group, and a three-way valve a is provided on the delivery pipeline a to control the flow direction of different liquids delivered by the delivery pipeline a.

[0013] Preferably, a delivery pipeline b is provided between the outer walls of the upper ends of the container group, and the other end of the delivery pipeline b is fixedly connected to a three-way valve b to control the circulation of one of the different liquids in the delivery pipeline b.

[0014] Preferably, a delivery pipeline c is fixedly connected between the three-way valve b and the microscopic model to limit the flow direction of the liquid, and a connecting line is fixedly connected between the microscope and the data processor to transmit the image data taken by the microscope to the data processor for image processing.

[0015] Preferably, a delivery pipeline d is fixedly connected to the outer wall of the right end of the connector to discharge the fluid outward, and the other end of the delivery pipeline d is fixedly connected to a recovery fluid meter to collect the discharged fluid.

[0016] Compared with the prior art, the utility model provides a core displacement device, which has the following beneficial effects:

[0017] By installing leak-proof pads, fixing rings a, fixing rings b and thin films, the airtightness between the connector and the fixing head is filled and increased, and the occurrence of gas and liquid entering the microporous model is reduced. When gas flows inside the microporous model during monitoring of fluid flow, the film between the fixing rings a and b, which was originally in a contracted state, will become inflated, indicating that gas is flowing. By observing the state of the film, it can be determined that there is gas circulation inside the microporous model, which can help to promptly discover the situation of gas entering the microporous model, so as to take timely measures to solve the problem and ensure the accuracy and reliability of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1The utility model is a schematic diagram of the structure of a core displacement device.

[0019] Figure 2 It is a schematic diagram of the local structure of the microscopic model area of ​​the utility model.

[0020] Figure 3 It is a schematic diagram of the partial structure of the front cross section of the connector area of ​​the utility model.

[0021] In the figure: 1, micro pump; 2, three-way valve a; 3, delivery pipeline a; 4, container group; 5, delivery pipeline b; 6, three-way valve b; 7, delivery pipeline c; 8, microscope; 9, connecting line; 10, data processor; 11, collection liquid meter; 12, delivery pipeline d; 13, micro model; 14, suction port; 15, film; 16, connector; 17, port; 18, leak-proof pad; 19, fixed head; 20, fixing ring a; 21, support plate; 22, fixing ring b; 23, thread. DETAILED DESCRIPTION

[0022] 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. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model provides Figure 1-3 A core displacement device shown includes a micro pump 1 and a container group 4 installed on the left side of the micro pump 1;

[0024] A microscope 8 is provided on the right side of the container group 4;

[0025] A microscopic model 13 is provided on the lower side of the microscope 8;

[0026] A data processor 10 is provided on the right side of the micro model 13. A suction port 14 is fixedly connected to the outer wall of the right end of the micro model 13 near the upper side to connect with an external vacuum pump. A fixed head 19 is fixedly connected to the outer wall of the right end of the micro model 13 near the lower side. A connector 16 is screwed on the circular outer wall of the fixed head 19. First, the suction port 14 is connected to the external vacuum pump and the micro model 13 is sucked into a vacuum state for two hours. Then, the saturated formation water inside the container group 4 is used with the configured simulated displacement formation water to establish the bound water saturation and stand for twenty-four hours. The crude oil in the micro model 13 is displaced with injected water until the residual oil is formed. The chemical agent is used to displace the residual oil. During the displacement process, the microscope 8 is used to take pictures, the startup process and distribution of the residual oil are collected in real time, the flow process and various phenomena in the experiment are recorded, and the photographed data are transmitted to the data processor 10 for research and analysis.

[0027] A leak-proof pad 18 is arranged between the connecting head 16 and the fixed head 19, a fixing ring a20 is fixedly connected to the leftmost side of the circular outer wall of the fixed head 19, a fixing ring b22 is screwed on the circular outer wall of the connecting head 16 near the left side, and a film 15 is fixedly connected between the fixing ring a20 and the fixing ring b22. During the vacuum pumping process of the microscopic model 13, the leak-proof pad 18 can fill the gap between the connecting head 16 and the fixed head 19, and during the subsequent experiments, if gas circulation occurs in the microscopic model 13, gas leakage will occur and the film 15 between the fixing ring a20 and the fixing ring b22 will bulge, so as to alert the experimenters to carry out maintenance.

[0028] like Figure 2 and Figure 3 As shown, a support plate 21 is fixedly connected between the fixing ring a20 and the fixing ring b22 and located at the lower side of the film 15 to maintain the surface tension of the film 15, and a plurality of vertical through-holes 17 are equidistantly provided inside the upper outer wall of the support plate 21 to allow gas to circulate and control the state of the film 15, and threads 23 are provided on the circular inner wall of the lower end of the fixing ring b22 and the circular outer wall of the connecting head 16, and the two threads 23 are screwed together to limit the position between the fixing ring b22 and the connecting head 16.

[0029] When the gas enters between the fixing ring a20 and the fixing ring b22 through the leak-proof pad 18, the film 15 will be inflated through the opening 17 opened on the support plate 21 to alert the experimenter of the gas leakage. When installing between the connecting head 16 and the fixing head 19, the connecting head 16 is inserted into the interior of the fixing ring b22 and rotated clockwise. Under the action of the thread 23, the connecting head 16 and the fixing ring b22 are screwed together for connection and fixation.

[0030] like Figure 3As shown, the film 15 is attached to the surface of the support plate 21 when there is no air between the fixing ring a20 and the fixing ring b22, and the film 15 is away from the surface of the support plate 21 when there is air between the fixing ring a20 and the fixing ring b22.

[0031] Whether the interior of the microscopic model 13 is in a vacuum environment is determined by the state in which the film 15 is attached to or not attached to the support plate 21 .

[0032] like Figure 1 As shown, a delivery pipeline a3 is fixedly connected between the micro pump 1 and the container group 4, and a three-way valve a2 is provided on the delivery pipeline a3 to control the flow direction of different liquids delivered by the delivery pipeline a3. A delivery pipeline b5 is provided between the upper end outer walls of the container group 4, and the other end of the delivery pipeline b5 is fixedly connected to a three-way valve b6 to control the circulation of one of the different liquids in the delivery pipeline b5.

[0033] The fluid output by the micro pump 1 can be transmitted outwardly through the delivery pipeline a3, and under the control of the three-way valve a2, different fluids are input into the corresponding container group 4. When the different fluids inside the container group 4 are transported outwardly, they are discharged outwardly through the delivery pipeline b5, and under the restriction of the three-way valve b6, the corresponding liquid is selected to be discharged outwardly.

[0034] like Figure 1 As shown, a delivery pipeline c7 is fixedly connected between the three-way valve b6 and the microscopic model 13 to limit the flow direction of the liquid, a connection line 9 is fixedly connected between the microscope 8 and the data processor 10 to transmit the image data captured by the microscope 8 to the inside of the data processor 10 for image processing, and a delivery pipeline d12 is fixedly connected to the outer wall of the right end of the connector 16 to discharge the fluid outward, and the other end of the delivery pipeline d12 is fixedly connected to a recovery fluid meter 11 to collect the discharged fluid.

[0035] The fluid passing through the three-way valve b6 will be transported to the micro model 13 through the transport pipeline c7 and circulate from left to right through the gap. The images taken by the microscope 8 and the data transmitted through the connecting line 9 are transmitted to the data processor 10 for result analysis. After passing through the micro model 13, the fluid will be discharged to the recovery fluid meter 11 through the transport pipeline d12 for collection.

[0036] The implementation principle of this embodiment is as follows: first, the suction port 14 is connected to an external vacuum pump and the micro model 13 is sucked into a vacuum state for two hours. Then, the saturated formation water inside the container group 4 is replaced by the configured simulated displacement formation water to establish the bound water saturation and stand for twenty-four hours. The crude oil in the micro model 13 is replaced by injected water until the residual oil is formed. The chemical agent is used to replace the residual oil. During the displacement process, the microscope 8 is used to take pictures, and the start-up process and distribution of the residual oil are collected in real time. The flow process and various phenomena in the experiment are recorded, and the photographed data are transmitted to the data processor 10 for research and analysis. During the vacuum pumping process of the micro model 13, the gap between the connector 16 and the fixed head 19 can be filled by the leak-proof pad 18. In the subsequent experimental process, if gas flows in the micro model 13, it will cause gas leakage and cause the film 15 between the fixed ring a20 and the fixed ring b22 to bulge, so as to alert the experimenter to perform maintenance.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A core displacement device, comprising a micro pump (1) and a container group (4) installed on the left side of the micro pump (1); A microscope (8) is arranged on the right side of the container group (4); A microscopic model (13) is provided on the lower side of the microscope (8); A data processor (10) is arranged on the right side of the microscopic model (13); a suction port (14) is fixedly connected to the upper side of the right end outer wall of the microscopic model (13) to connect to an external vacuum pump; a fixed head (19) is fixedly connected to the lower side of the right end outer wall of the microscopic model (13); a connecting head (16) is screwed on the circular outer wall of the fixed head (19); Features: A leak-proof pad (18) is provided between the connecting head (16) and the fixing head (19); a fixing ring a (20) is fixedly connected to the leftmost side of the circular outer wall of the fixing head (19); a fixing ring b (22) is screwed on the circular outer wall of the connecting head (16) near the left side; and a film (15) is fixedly connected between the fixing ring a (20) and the fixing ring b (22).

2. A core displacement device according to claim 1, characterized in that: A support plate (21) is fixedly connected between the fixing ring a (20) and the fixing ring b (22) and located at the lower side of the film (15) to maintain the surface tension of the film (15); a plurality of vertically penetrating openings (17) are equidistantly provided inside the upper outer wall of the support plate (21) to allow gas to circulate and control the state of the film (15).

3. A core displacement device according to claim 1, characterized in that: The circular inner wall at the lower end of the fixing ring b (22) and the circular outer wall of the connecting head (16) are both provided with threads (23), and the two threads (23) are screwed together to limit the position between the fixing ring b (22) and the connecting head (16).

4. A core displacement device according to claim 1, characterized in that: The film (15) is attached to the surface of the support plate (21) when there is no air between the fixing ring a (20) and the fixing ring b (22), and the film (15) is away from the surface of the support plate (21) when there is air between the fixing ring a (20) and the fixing ring b (22).

5. A core displacement device according to claim 1, characterized in that: A delivery pipeline a (3) is fixedly connected between the micro pump (1) and the container group (4), and a three-way valve a (2) is provided on the delivery pipeline a (3) to control the flow direction of different liquids delivered by the delivery pipeline a (3).

6. A core displacement device according to claim 1, characterized in that: A delivery pipeline b (5) is arranged between the upper outer walls of the container group (4), and the other end of the delivery pipeline b (5) is fixedly connected to a three-way valve b (6) to control the flow of one of the different liquids in the delivery pipeline b (5).

7. A core displacement device according to claim 6, characterized in that: A delivery pipeline c (7) is fixedly connected between the three-way valve b (6) and the microscopic model (13) to limit the flow direction of the liquid, and a connection line (9) is fixedly connected between the microscope (8) and the data processor (10) to transmit the image data captured by the microscope (8) to the data processor (10) for image processing.

8. A core displacement device according to claim 1, characterized in that: The outer wall of the right end of the connector (16) is fixedly connected to a delivery pipeline d (12) to discharge the fluid outwards, and the other end of the delivery pipeline d (12) is fixedly connected to a recovery fluid meter (11) to collect the discharged fluid.

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