Oil reservoir horizontal well carbon dioxide huff and puff oil production simulation experiment device

Abstract

The utility model relates to the technical field of carbon dioxide huff-puff oil extraction experiments, in particular to an oil reservoir horizontal well carbon dioxide huff-puff oil extraction simulation experiment device. The oil reservoir horizontal well carbon dioxide huff and puff oil extraction simulation experiment device comprises a metal frame plate, a groove is formed in the metal frame plate, and a plurality of evenly-distributed mounting holes are formed in the portion, at the bottom of the groove, of the metal frame plate; variable-diameter pieces are mounted in the mounting holes, an artificial rock core slice is inserted into a groove formed in the metal frame plate, and a metal filter screen covers the artificial rock core slice. According to the carbon dioxide huff and puff oil extraction simulation experiment device for the oil reservoir horizontal well, the variable-diameter pieces with the seepage holes with different hole diameters are flexibly combined and installed in the different installation holes, so that an area with remarkable permeability difference can be constructed on the plane of the seepage partition plate; and the simulation fidelity and applicability of the experimental device to the complex heterogeneous characteristics of the real oil reservoir are remarkably improved, so that the experimental result has higher geological representativeness and guiding significance.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide huff and puff oil production experiments, in particular to a carbon dioxide huff and puff oil production simulation experiment device for horizontal wells in oil reservoirs. Background Art

[0002] With the continuous advancement of exploration and development technologies and the deepening of exploration and development work, the reserves of low-permeability tight oil reservoirs are increasing. Tight oil has become a very important unconventional resource. Carbon dioxide stands out in the screening of media for energy supplementation in tight oil reservoirs due to its good injectability, good miscibility with crude oil, and easy miscibility with crude oil. Horizontal well carbon dioxide huff-and-puff technology has now become an important key technology for the effective development of tight oil reservoirs.

[0003] Currently, conventional CO2 huff-and-puff experiments are typically conducted using natural or artificial cores. The huff-and-puff region is too small, and horizontal well huff-and-puff simulations are impossible. To address these issues, patent publication CN215108867U simulates horizontal wells within a sand-filled box, fully enhancing the authenticity of the simulated oilfield development environment. Through the design of permeable baffles, bottom-water reservoir simulation and parameter optimization research are conducted, improving the versatility and applicability of this experimental simulation device. However, this patent has the following technical drawbacks:

[0004] 1. The patent's permeable baffles feature uniformly distributed holes, which cannot effectively simulate the heterogeneous characteristics commonly found in real reservoirs (such as permeability zoning, high-permeability zones, and fracture systems). This homogenized design severely compromises the experimental device's applicability to complex geological conditions and the representativeness of the simulation results.

[0005] 2. The patented permeable membrane is easy to clog and difficult to maintain. The permeable partition is only covered with a layer of permeable membrane. Sand particles are easy to clog the membrane pores during long-term experiments.

[0006] In order to solve the above problems, it is necessary to improve the permeation partition structure based on the publication number CN215108867U to solve the above technical problems. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides a carbon dioxide huff-and-puff oil production simulation experimental device for horizontal wells in oil reservoirs.

[0008] The utility model provides a carbon dioxide huff-and-puff oil production simulation experimental device for a horizontal well in an oil reservoir, comprising a metal frame plate, a groove being formed on the metal frame plate, and a plurality of evenly distributed mounting holes being formed on the metal frame plate at the bottom of the groove;

[0009] A reducing member is installed in each of the mounting holes, and the reducing member includes an insertion column, a coaxially arranged abutment disk is fixedly embedded on the top of the insertion column, and a seepage hole is opened on the abutment disk to pass through the insertion column, and the seepage holes for installing the reducing members in the mounting holes have different diameters;

[0010] An artificial core sheet is inserted into the groove of the metal frame plate, and a metal filter screen is covered on the artificial core sheet.

[0011] Preferably, the pore diameters of the seepage holes are 0 mm and 0.5-2 mm.

[0012] Preferably, a threaded portion is provided on the outer cylindrical surface of the insertion column close to the bottom, and a nut with a threaded connection is sleeved on the threaded portion.

[0013] Preferably, the mounting hole includes a fitting groove, which is opened on the metal frame plate at the bottom of the groove, and a coaxial through hole is opened at the bottom of the fitting groove, the aperture of the through hole is smaller than the inner diameter of the fitting groove, and the through hole and the insertion column are adapted to each other.

[0014] Preferably, the metal frame plates on both sides of the groove are provided with side slide grooves, and the metal frame plates above the side slide grooves constitute edge portions, the edge portions are provided with threaded through holes, and threaded compression screws are inserted into the threaded through holes.

[0015] Preferably, a mesh frame is fixedly mounted on the metal filter.

[0016] Preferably, a pad is fixedly mounted on the bottom of the metal frame plate.

[0017] Compared with related technologies, the carbon dioxide huff-and-puff oil production simulation experimental device for horizontal wells in oil reservoirs provided by the present invention has the following beneficial effects:

[0018] 1. By flexibly combining and installing reducers with different diameters of permeable holes (including no holes) in different installation holes, the utility model can construct areas with significantly different permeabilities on the permeable baffle plane, and even simulate the spatial distribution of fractures or high-permeability strips. This significantly improves the fidelity and applicability of the experimental device to the complex heterogeneous characteristics of real oil reservoirs, making the experimental results more geologically representative and instructive.

[0019] 2. The utility model changes the permeable partition into a three-layer composite structure. The bottom layer is a metal frame plate, which not only supports the overall structure, but also can simulate the heterogeneous characteristics of real oil reservoirs by installing reducers. The middle layer adopts artificial core slices to simulate the heterogeneity of real reservoirs, and the upper layer adopts corrosion-resistant metal filter screen to prevent sand particles from entering and clogging the seepage holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A structural schematic diagram of a preferred embodiment of a carbon dioxide huff-and-puff oil production simulation experimental device for horizontal wells in an oil reservoir provided by the utility model;

[0021] Figure 2 for Figure 1 A schematic structural diagram of the metal frame plate shown;

[0022] Figure 3 This is a structural diagram of the reducer provided by the utility model being installed on a metal frame plate;

[0023] Figure 4 for Figure 3 The structural diagram of the reducer shown;

[0024] Figure 5 for Figure 4 Schematic diagram of the specifications of seepage holes of different diameters of the reducer shown;

[0025] Figure 6 for Figure 2 The back structure diagram of the reducer installed on the metal frame plate;

[0026] Figure 7 for Figure 1 Schematic diagram of the structure of the artificial core slice and metal filter.

[0027] Numbers in the figure: 1, metal frame plate; 1a, groove; 1b, mounting hole; 1b1, fitting groove; 1b2, through hole; 1c, side slide groove; 11, edge portion; 12, pad; 2, press-fit screw; 3, reducer; 31, insertion column; 311, threaded portion; 32, abutment disk; 33, nut; 3a, seepage hole; 4, artificial core slice; 5, metal filter; 51, mesh frame. DETAILED DESCRIPTION

[0028] 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 only used to explain the present invention and are not intended to limit the present invention.

[0029] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0030] See also Figures 1 to 7 The embodiment of the present invention provides a carbon dioxide huff and puff oil production simulation experimental device for a horizontal well in an oil reservoir. The carbon dioxide huff and puff oil production simulation experimental device for a horizontal well in an oil reservoir includes a metal frame plate 1, a reducer 3 and a metal filter 5.

[0031] In the embodiments of the present invention, please refer to Figures 1 to 7A groove 1a is formed on the metal frame plate 1, and a plurality of evenly distributed mounting holes 1b are formed on the metal frame plate 1 at the bottom of the groove 1a. The mounting holes 1b include a fitting groove 1b1. The fitting groove 1b1 is formed on the metal frame plate 1 at the bottom of the groove 1a, and a coaxial through hole 1b2 is formed at the bottom of the fitting groove 1b1. The diameter of the through hole 1b2 is smaller than the inner diameter of the fitting groove 1b1.

[0032] A reducer 3 is installed in each mounting hole 1b, and the reducer 3 includes an insertion column 31, the insertion column 31 and the through hole 1b2 are adapted to each other, and a coaxially arranged abutment disk 32 is fixedly embedded on the top of the insertion column 31, and a seepage hole 3a that passes through the insertion column 31 is opened on the abutment disk 32, and a threaded portion 311 is provided on the outer cylindrical surface of the insertion column 31 near the bottom, and a nut 33 is threadedly connected on the threaded portion 311. The seepage holes 3a for installing the reducer 3 in the mounting hole 1b have different apertures;

[0033] The seepage holes 3a have diameters of 0 mm and 0.5-2 mm. The seepage holes 3a with a diameter of 0 mm are holes left on the abutting disc 32 and the insertion column 31 , and the seepage holes 3a of the remaining diameter-changing member 3 are 0.5-2 mm.

[0034] It should be noted that when installing the reducer 3 on the mounting hole 1b, the insertion column 31 is sequentially passed through the fitting groove 1b1 and the through hole 1b2 until the fitting disk 32 abuts against the fitting groove 1b1, and then the nut 33 is sleeved on the threaded portion 311 and tightened, thereby completing the installation of the reducer 3 on the mounting hole 1b. By flexibly combining and installing reducers 3 with seepage holes 3a of different pore sizes (including no holes) in different mounting holes 1b, it is possible to construct areas with significant permeability differences (high permeability areas, low permeability areas, non-permeability obstruction areas, etc.) on the permeability partition plane, and even simulate the spatial distribution of fractures or high permeability strips, thereby significantly improving the simulation fidelity and applicability of the experimental device to the complex heterogeneous characteristics of real oil reservoirs, making the experimental results more geologically representative and instructive.

[0035] In this embodiment, since the reducers 3 with different seepage holes 3a diameters can be installed in various installation holes 1b at will, multiple people can perform the installation at the same time, thereby improving work efficiency.

[0036] Furthermore, a pad 12 is fixedly installed on the bottom of the metal frame plate 1, which, on the one hand, supports the metal frame plate 1, and on the other hand, prevents the threaded portion 311 of the insertion column 31 from directly contacting the bottom of the sand filling box.

[0037] In the embodiments of the present invention, please refer to Figures 1 to 7The metal frame plates 1 on both sides of the groove 1a are provided with side sliding grooves 1c, and the metal frame plates 1 above the side sliding grooves 1c constitute an edge portion 11, a threaded through hole is provided on the edge portion 11, and a threaded pressing screw 2 is inserted into the threaded through hole, and an artificial core sheet 4 is inserted in the groove 1a provided on the metal frame plate 1, and a metal filter screen 5 is covered on the artificial core sheet 4, and a mesh frame 51 is fixedly installed on the metal filter screen 5.

[0038] It should be noted that: after the reducers 3 are installed in each mounting hole 1b, the artificial core slice 4 is inserted into the groove 1a provided in the metal frame plate 1, and the two sides of the artificial core slice 4 are kept sliding along the side slide grooves 1c, and then the mesh frame 51 is inserted into the groove 1a and the mesh frame 51 is kept sliding inward along the side slide grooves 1c, and then the pressing screw 2 is tightened to firmly press the mesh frame 51, so that the mesh frame 51 fits the artificial core slice 4 tightly into the groove 1a.

[0039] Among them, if the metal filter 5 needs to be cleaned or replaced, or the artificial core slice 4 with different heterogeneity needs to be replaced, it can be removed by simply loosening the pressing screw 2. The maintenance operation is simple and quick, and the reducer 3 can also be replaced separately by loosening the nut 33.

[0040] In this application, the permeable partition is changed into a three-layer composite structure, the bottom layer of which is a metal frame plate 1, which not only supports the overall structure, but also can simulate the heterogeneous characteristics of a real oil reservoir by installing a reducer 3. The middle layer uses a replaceable artificial core sheet 4 to simulate the heterogeneity of the real reservoir, and the upper layer uses a corrosion-resistant metal filter 5 to prevent sand particles from entering and causing blockage of the seepage hole 3a.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A carbon dioxide huff-and-puff oil production simulation experimental device for a horizontal well in an oil reservoir, comprising a metal frame plate (1), wherein a groove (1a) is formed on the metal frame plate (1), and a plurality of evenly distributed mounting holes (1b) are formed on the metal frame plate (1) at the bottom of the groove (1a), characterized in that: A diameter reducing member (3) is installed in each of the mounting holes (1b), and the diameter reducing member (3) includes an insertion column (31), a coaxially arranged abutment disk (32) is fixedly engaged on the top of the insertion column (31), and a seepage hole (3a) penetrating the insertion column (31) is provided on the abutment disk (32), and the seepage holes (3a) for installing the diameter reducing member (3) in the mounting hole (1b) have different apertures; An artificial rock core sheet (4) is inserted into the groove (1a) formed in the metal frame plate (1), and a metal filter (5) is covered on the artificial rock core sheet (4).

2. The oil reservoir horizontal well carbon dioxide huff and puff oil production simulation experimental device according to claim 1, characterized in that: The pore diameters of the seepage holes (3a) are 0 mm and 0.5-2 mm.

3. The oil reservoir horizontal well carbon dioxide huff and puff oil production simulation experimental device according to claim 1, characterized in that: A threaded portion (311) is provided on the outer cylindrical surface of the insertion column (31) close to the bottom, and a nut (33) for threaded connection is sleeved on the threaded portion (311).

4. The oil reservoir horizontal well carbon dioxide huff and puff oil production simulation experimental device according to claim 1, characterized in that: The mounting hole (1b) comprises a fitting groove (1b1), the fitting groove (1b1) being provided on the metal frame plate (1) at the bottom of the groove (1a), and a coaxially arranged through hole (1b2) being provided at the bottom of the fitting groove (1b1), the aperture of the through hole (1b2) being smaller than the inner diameter of the fitting groove (1b1), and the through hole (1b2) and the insertion column (31) being adapted to each other.

5. The oil reservoir horizontal well carbon dioxide huff-and-puff oil production simulation experimental device according to claim 1, characterized in that: The metal frame plates (1) on both sides of the groove (1a) are provided with side sliding grooves (1c), and the metal frame plates (1) above the side sliding grooves (1c) form an edge portion (11), and the edge portion (11) is provided with a threaded through hole, and a threaded pressing screw (2) is inserted into the threaded through hole.

6. The oil reservoir horizontal well carbon dioxide huff and puff oil production simulation experimental device according to claim 1, characterized in that: A mesh frame (51) is fixedly mounted on the metal filter screen (5).

7. The oil reservoir horizontal well carbon dioxide huff and puff oil production simulation experimental device according to claim 1, characterized in that: A backing plate (12) is fixedly mounted on the bottom of the metal frame plate (1).

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