Experimental device for simulating rock dynamic imbibition under high temperature and high pressure
By designing a high-temperature and high-pressure dynamic permeation test device for rocks, the problem of discrepancies between experimental results and actual reservoirs under normal pressure conditions was solved, achieving more accurate permeation simulation and improving the recovery rate prediction of low-permeability reservoirs.
Patent Information
- Application Number
- CN202520057291.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-01-10
AI Technical Summary
Existing permeation dynamics measurement devices are used to conduct experiments under normal pressure conditions, which cannot accurately reflect the permeation dynamics under high pressure. This results in significant discrepancies between experimental results and actual reservoir conditions, thus affecting the recovery rate of low-permeability reservoirs.
An experimental device for simulating dynamic rock permeation under high temperature and high pressure conditions was designed, including an injection unit, a temperature control device, and an experimental unit. A high-precision displacement pump, a constant temperature water bath or an electric heating device are used to simulate the rock core permeation environment through a high-pressure glass tube and a metal cavity, providing experimental conditions under high pressure flow.
This improves the accuracy of experimental simulations, enabling a more realistic reflection of the core seepage process and enhancing the accuracy of recovery rate predictions for low-permeability reservoirs.
Smart Images
Figure CN223808312U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to experimental device field, especially a kind of experimental device of simulating rock dynamic imbibition under high temperature and high pressure. BACKGROUND
[0002] Imbibition is the process that porous medium spontaneously absorbs certain wetting phase fluid while displacing non-wetting phase fluid. In recent years, due to increasing energy demand and decreasing recoverable reserves of conventional oil and gas resources, one of the main exploitation objects in the future is low-permeability reservoirs. There is a fracture system in low-permeability reservoirs. Due to imbibition, water can displace and drive oil in matrix rock to the fracture system. It can be said that imbibition determines the productivity of such reservoirs. Therefore, it is of great significance to simulate formation imbibition under formation conditions in the laboratory to improve the recovery efficiency of low-permeability reservoirs.
[0003] Currently, the test conditions of imbibition dynamic determination devices are usually normal pressure. Since the imbibition oil displacement environment dominated by capillary pressure is a high-pressure environment, the results obtained by these imbibition dynamic determination devices cannot truly reflect the imbibition dynamics of actual reservoirs. SUMMARY
[0004] The utility model aims at providing a kind of experimental device of simulating rock dynamic imbibition under high temperature and high pressure, can simulate core imbibition environment, provide high-pressure, flow state experimental environment, improve simulation accuracy.
[0005] To achieve the above-mentioned purpose, the utility model is implemented by adopting the following technical solutions:
[0006] The utility model discloses a kind of experimental device of simulating rock dynamic imbibition under high temperature and high pressure, including injection unit, temperature control device, experimental unit;Injection unit includes injection unit, temperature control device, experimental unit;Injection unit includes high-precision displacement pump, high-precision displacement pump is connected with anti-high pressure intermediate container by valve C, anti-high pressure intermediate container is equipped with pressure gauge;Experimental unit includes core imbibition cavity, core imbibition cavity includes metal cavity, core cover, metal cavity is adapted to core cover, core cover top is connected with anti-high pressure glass tube bottom end, anti-high pressure glass tube top is equipped with valve A, valve A is connected with vacuum pump by pressure discharge port, core imbibition cavity is connected with anti-high pressure intermediate container by valve B, rotor is equipped in the inner chamber bottom of metal cavity, high-pressure glass tube is equipped with scale ruler, high-pressure glass tube is equipped with magnifying glass outside, magnifying glass is adapted to scale ruler;Temperature control device acts on the outer wall of metal cavity to change the temperature inside metal cavity.
[0007] Preferably, the temperature control device is a constant-temperature water bath device.
[0008] Preferably, the temperature control device is an electric heating device.
[0009] Preferably, valve C has a pressure injection port at its inlet, and valve C is detachably connected to a high-precision displacement pump through the pressure injection port.
[0010] Preferably, the top of the high-pressure glass tube is fixed to the top of the robotic arm, and the bottom of the robotic arm is fixed to the magnifying glass.
[0011] Preferably, the robotic arm has ≥2 degrees of freedom.
[0012] Preferably, the high-precision displacement pump has constant pressure and constant speed functions.
[0013] Preferably, a metal mesh is provided at the bottom of the metal cavity, and the metal mesh is located above the rotor.
[0014] The beneficial effects of this utility model are:
[0015] This invention can simulate the seepage environment of rock cores, providing an experimental environment under high pressure and flow conditions, thereby improving the accuracy of the simulation. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the present invention.
[0017] In the diagram: 1-Valve A, 2-Valve B, 3-High-pressure resistant glass tube, 4-Metal cavity, 5-Pressure discharge port, 6-Pressure injection port, 7-Temperature control device, 8-Pressure gauge, 9-High-pressure resistant intermediate container, 10-Valve C, 11-High-precision displacement pump, 12-Rotor, 13-Robotic arm, 14-Magnifying glass, 15-Metal mesh, 16-Vacuum pump. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings.
[0019] like Figure 1 As shown, this utility model includes an injection unit, a temperature control device 7, and an experimental unit. The injection unit includes an injection unit, a temperature control device 7, and an experimental unit. The injection unit includes a high-precision displacement pump 11, which is connected to a high-pressure intermediate container 9 via valve C10. The high-pressure intermediate container 9 is equipped with a pressure gauge 8. The experimental unit includes a core absorption chamber, which includes a metal cavity 4 and a core cover. The metal cavity 4 is fitted with the core cover. The top of the core cover is connected to the bottom of a high-pressure glass tube 3. The top of the high-pressure glass tube 3 is equipped with a valve A1, which is connected to a vacuum pump 16 via a pressure relief port 5. The core absorption chamber is connected to the high-pressure intermediate container 9 via valve B2. A rotor 12 is located at the bottom of the inner cavity of the metal cavity 4. The high-pressure glass tube is equipped with a scale, and a magnifying glass 14 is located outside the high-pressure glass tube. The magnifying glass 14 is fitted with the scale. The temperature control device 7 acts on the outer wall of the metal cavity 4 to change the internal temperature of the metal cavity 4.
[0020] To ensure the temperature of the experimental device, the temperature control device 7 is a constant temperature water bath device or an electric heating device.
[0021] To facilitate the installation of the equipment, the valve C10 inlet is provided with an injection port 6, and the valve C10 is detachably connected with the high-precision displacement pump 11 through the injection port 6. The top end of the high-pressure glass tube is fixedly connected with the top end of the mechanical arm 13, the bottom end of the mechanical arm 13 is fixedly connected with the magnifying glass 14, and the mechanical arm 13 has ≥2 degrees of freedom.
[0022] To improve the experimental accuracy, the high-precision displacement pump 11 has a constant pressure and constant speed function.
[0023] To prevent the experimental sample from falling, the bottom of the metal cavity 4 is provided with a metal screen 15, and the metal screen 15 is located above the rotor 12.
[0024] In actual use, the specific steps are as follows:
[0025] I. Connection device;
[0026] II. Inspection device, close valve A1, open valve B2 and valve C10, start high-precision displacement pump 11, inject inert gas into the device from valve C10, read pressure gauge 8 to ensure that the device has appropriate pressure, and detect whether the device is completely sealed; after ensuring that the device is well sealed, close valve C10, close high-precision displacement pump 11, stop injecting gas, open valve A1, and exhaust the gas in the device to determine whether the device is normally ventilated;
[0027] III. Sample placement, place the selected sample required for the experiment in the metal cavity 4, and cover the core cover;
[0028] IV. Vacuum treatment, open valve A1 and valve B2, close valve C10, start vacuum pump 16 to perform vacuum treatment on the device, and then close the vacuum pump 16;
[0029] V. Injection of imbibition liquid, open valve A1, valve B2 and valve C10, start high-precision displacement pump 11, inject imbibition liquid from the injection port 6 of valve C10 into the anti-high-pressure glass tube 3 at the zero scale liquid amount, close valve A1, continue to inject pressure into the device, until the pressure gauge 8 shows that the required pressure of the experiment is reached, close valve B2, close valve C10, close high-precision displacement pump 11, stop pressure injection, and remove the vacuum pump 16;
[0030] VI. Water bath heating, disconnect the connection between valve C10 and high-precision displacement pump 11, and place part of the metal cavity 4 in the water bath heating of the temperature control device 7, so that the temperature environment of the device reaches the required temperature of the experiment;
[0031] VII. Dynamic imbibition, open the rotor 12 to make the liquid in the cavity flow;
[0032] Eight, take out the core, when the anti-high pressure glass tube 3 shows no change for a long time, then it represents that the core is saturated, after recording the number shown by the test tube at this time, open the valve A1 to discharge pressure, and then take out the core in the metal cavity 4.
[0033] Of course, the present application can also have other various embodiments, without departing from the spirit and essence of the present application, those skilled in the art can make various corresponding changes and modifications according to the present application, but these corresponding changes and modifications should belong to the protection scope of the claims attached to the present application.
Claims
1. An experimental device for simulating dynamic imbibition of rock under high temperature and high pressure, characterized in that: The injection unit, the temperature control device (7), and the experimental unit are included. The injection unit includes a high-precision displacement pump (11) connected to an anti-high-pressure intermediate container (9) through a valve C (10), and the anti-high-pressure intermediate container (9) is provided with a pressure gauge (8). The experimental unit includes a core infiltration cavity, which includes a metal cavity (4) and a core cover, the metal cavity (4) is adapted to the core cover, the top of the core cover is connected to the bottom end of an anti-high-pressure glass tube (3), the top end of the anti-high-pressure glass tube (3) is provided with a valve A (1), the valve A (1) is connected to a vacuum pump (16) through a pressure relief port (5), the core infiltration cavity is connected to the anti-high-pressure intermediate container (9) through a valve B (2), the inner cavity of the metal cavity (4) is provided with a rotor (12), the high-pressure glass tube is provided with a scale, and the outside of the high-pressure glass tube is provided with a magnifying glass (14) adapted to the scale. The temperature control device (7) acts on the outer wall of the metal cavity (4) to change the internal temperature of the metal cavity (4).
2. The experimental setup of claim 1, wherein: The temperature control device (7) is a constant temperature water bath device.
3. The experimental setup of claim 1, wherein: The temperature control device (7) is an electric heating device.
4. The experimental setup of claim 1, wherein: The valve C (10) is provided with a pressure injection port (6) at the inlet, and the valve C (10) is detachably connected to the high-precision displacement pump (11) through the pressure injection port (6).
5. The experimental setup of claim 1, wherein: The top end of the high-pressure glass tube is fixedly connected to the top end of a mechanical arm (13), and the bottom end of the mechanical arm (13) is fixedly connected to the magnifying glass (14).
6. The experimental apparatus of claim 5, wherein: The mechanical arm (13) has a freedom degree of ≥2.
7. The experimental setup of claim 1, wherein: The high-precision displacement pump (11) has a constant pressure and constant speed function.
8. The experimental setup of claim 1, wherein: The bottom of the metal cavity (4) is provided with a metal screen (15) located above the rotor (12).