Horizontal well carbon dioxide injection oil displacement simulation device

Abstract

The utility model discloses a horizontal well carbon dioxide injection oil displacement simulation device which comprises a core barrel, a sealing rubber pipe is arranged in the core barrel, the central axis of the core barrel coincides with the central axis of the sealing rubber pipe, and the sealing rubber pipe is filled with a core. Sealing covers are connected to the two ends of the core barrel, and the core is attached to the sealing covers; one end of the core barrel is connected with a water injection pipe and a gas injection pipe which penetrate through the sealing cover and are communicated with the core barrel, and the other end of the core barrel is connected with an extraction pipe which penetrates through the sealing cover and is communicated with the core barrel; a pressurizing pipe is connected to the side wall of the core barrel, the pressurizing pipe is communicated with the core barrel, a heating plate is installed on the side wall of the core barrel, and the problem that in the prior art, an indoor oil displacement simulation device cannot simulate water displacement or CO2 oil displacement after horizontal well fracturing is completed is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of simulated gas injection production equipment and relates to a horizontal well carbon dioxide injection oil recovery simulation device. Background Art

[0002] A horizontal well is a special well with a maximum inclination angle of 90° or close to 90° and a horizontal well section of a certain length maintained in the target layer. Sometimes, for some special needs, the inclination angle can exceed 90°. Generally speaking, horizontal wells are suitable for thin oil and gas layers or fractured oil and gas reservoirs, with the purpose of increasing the exposed area of ​​the oil and gas layers.

[0003] Horizontal well staged fracturing technology is one of the main measures to increase horizontal well production. It can safely form multiple optimized hydraulic fractures in a relatively long horizontal well section in a short time, and quickly drain the fluid after fracturing to achieve low-damage horizontal well staged fracturing.

[0004] After the horizontal well fracturing is completed, water drive and CO2 drive are usually required to further increase the production. However, in the current research, there is no simulation device that can well simulate the horizontal well fracturing and CO2 injection for oil recovery. The existing simulation devices generally directly displace the core. Utility Model Content

[0005] The utility model aims to provide a horizontal well carbon dioxide injection oil recovery experimental device, which solves the problem that the indoor oil recovery simulation device in the prior art cannot simulate water recovery or CO2 oil recovery after the horizontal well fracturing is completed.

[0006] The technical scheme adopted by the utility model is a horizontal well carbon dioxide injection oil recovery simulation device, comprising a core barrel, a sealing hose is arranged in the core barrel, the central axis of the core barrel coincides with the central axis of the sealing hose, and the sealing hose is filled with a core; both ends of the core barrel are connected with sealing covers, and the core fits the sealing covers; one end of the core barrel is connected with a water injection pipe and an air injection pipe, and the water injection pipe and the air injection pipe both penetrate the sealing cover and are connected with the core barrel, and the other end of the core barrel is connected with a production pipe, and the production pipe penetrates the sealing cover and is connected with the core barrel; a booster pipe is connected to the side wall of the core barrel, and the booster pipe is connected with the core barrel, and a heating plate is installed on the side wall of the core barrel.

[0007] The utility model is also characterized in that:

[0008] The core is cylindrical and has cracks in it. The cracks are parallel to the central axis of the simulated core.

[0009] Placement holes are provided in the core near the fractures.

[0010] A first extension tube, a second extension tube and a third extension tube are provided in the core barrel. One end of the first extension tube is connected to the water injection tube, and the other end of the first extension tube cooperates with the placement hole. One end of the second extension tube is connected to the gas injection tube, and the other end of the second extension tube cooperates with the placement hole. One end of the third extension tube is connected to the production tube, and the other end of the third extension tube cooperates with the placement hole.

[0011] The angle formed by the first extension pipe and the water injection pipe is 90° to 120°, the angle formed by the second extension pipe and the gas injection pipe is 90° to 120°, and the angle formed by the third extension pipe and the production pipe is 90° to 120°.

[0012] The beneficial effects of the utility model are as follows: the horizontal well carbon dioxide injection oil recovery simulation device of the utility model optimizes and improves the setting of the core and the clamping device of the core, so that it can realize the oil recovery simulation of water injection and gas injection after horizontal well fracturing; wherein, by making cracks in the core, the extension pipe cooperates with the placement hole, and the placement hole is connected with the cracks of the core, so as to facilitate oil recovery; the pressure and temperature of the horizontal well are simulated for the core, and water and CO2 are injected to realize simulated water injection, gas injection and oil production; each extension pipe in the core barrel is respectively connected to the connected water injection pipe, gas injection pipe and production pipe at a certain angle, so as to facilitate molding in the core without affecting its permeability, and at the same time, the positions of the water injection pipe, gas injection pipe and production pipe are obtained along the cracks according to the distribution of the cracks, and by simulating the formation pressure and formation temperature; it can truly reflect the water injection and CO2 injection oil recovery effect after horizontal well fracturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a horizontal well carbon dioxide injection oil recovery simulation device of the utility model.

[0014] In the figure, 1. core barrel, 2. sealing cover, 3. sealing hose, 4. core, 5. water injection pipe, 6. gas injection pipe, 7. production pipe, 8. booster pipe, 9. heating plate, 10. crack, 11. first extension pipe, 12. second extension pipe, 13. third extension pipe, 14. placement hole. DETAILED DESCRIPTION

[0015] The utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0016] The utility model of the horizontal well carbon dioxide injection oil recovery simulation device is as follows Figure 1As shown, it includes a core barrel 1, a sealing hose 3 is arranged in the core barrel 1, the central axis of the core barrel 1 coincides with the central axis of the sealing hose 3, and the sealing hose 3 is filled with a core 4; both ends of the core barrel 1 are connected with sealing covers 2, and the core 4 fits with the sealing covers 2; one end of the core barrel 1 is connected with a water injection pipe 5 and an air injection pipe 6, and the water injection pipe 5 and the air injection pipe 6 both pass through the sealing cover 2 and are connected with the core barrel 1, and the other end of the core barrel 1 is connected with a production pipe 7, and the production pipe 7 passes through the sealing cover 2 and is connected with the core barrel 1; the side wall of the core barrel 1 is connected with a booster pipe 8, and the booster pipe 8 is connected with the core barrel 1, and a heating plate 9 is installed on the side wall of the core barrel 1.

[0017] The core 4 is cylindrical, and a crack 10 is arranged inside the core 4 . The crack 10 is arranged parallel to the central axis of the simulated core 4 .

[0018] A placement hole 14 is provided in the core 4 near the crack 10 .

[0019] A first extension tube 11, a second extension tube 12 and a third extension tube 13 are provided in the core barrel 1. One end of the first extension tube 11 is connected to the water injection tube 5, and the other end of the first extension tube 11 cooperates with the placement hole 14. One end of the second extension tube 12 is connected to the gas injection tube 6, and the other end of the second extension tube 12 cooperates with the placement hole 14; one end of the third extension tube 13 is connected to the production tube 7, and the other end of the third extension tube 13 cooperates with the placement hole 14.

[0020] The angle formed by the first extension pipe 11 and the water injection pipe 5 is 90°-120°, the angle formed by the second extension pipe 12 and the gas injection pipe 6 is 90°-120°, and the angle formed by the third extension pipe 13 and the production pipe 7 is 90°-120°.

[0021] The fracture 10 is formed by pressing a sharp tool against the center of one side of the core 4 and connecting an external high-frequency vibration device to perform high-frequency vibration. The fracture 10 is parallel to or coincides with the central axis of the core 4, simulating the existence of fractures in the horizontal well to the greatest extent.

[0022] The connection between the fracture 10 and the placement hole 14 can be used to drive oil along the length of the fracture 10 after water or gas injection, and at the same time, the efficiency of oil driving is improved under external pressure.

[0023] Working principle: the core 4 is saturated with simulated formation oil and saturated with simulated formation water in turn, so that the core 4 is saturated with simulated formation oil, and then holes 14 for placing the first extension tube 11, the second extension tube 12 and the third extension tube 13 are opened at both ends of the core 4 near the crack 10; the crack 10 is generated in the core 4 by using a vibration device, the core 4 is placed in the sealing hose 3, and then the sealing hose 3 containing the core 4 is placed in the core barrel 1, and the two ends of the core barrel 1 are sealed by the sealing cover 2, and water is injected into the core barrel 1 through the booster pipe 8 to increase the confining pressure to simulate the real formation pressure of 12MPa~16MPa, and then the first extension tube 11, the second extension tube 12 and the third extension tube 13 are installed, and the seal between the first extension 11, the second extension tube 12 and the third extension tube 13 and the sealing cover 2 is maintained, and the heating plate 9 is turned on to heat to the simulated formation temperature of 75℃~85℃, and then the simulated water injection and CO2 injection oil recovery experiment is started;

[0024] Water is injected through the water injection pipe 5 to displace the saturated formation oil in the core 4 into the production pipe 7. After a period of time, CO2 is injected through the gas injection pipe 6 to displace the oil. The above operation is repeated to achieve alternating injection of water and gas, which can truly reflect the effect of water injection and CO2 injection for displacing oil after horizontal well fracturing.

[0025] Example 1

[0026] The utility model discloses a horizontal well carbon dioxide injection oil recovery simulation device, comprising a core barrel 1, a sealing rubber tube 3 is arranged in the core barrel 1, the central axis of the core barrel 1 coincides with the central axis of the sealing rubber tube 3, and the sealing rubber tube 3 is filled with a core 4; both ends of the core barrel 1 are connected with sealing covers 2, and the core 4 is fitted with the sealing covers 2; one end of the core barrel 1 is connected with a water injection pipe 5 and an air injection pipe 6, and the water injection pipe 5 and the air injection pipe 6 both penetrate the sealing cover 2 and are connected with the core barrel 1, and the other end of the core barrel 1 is connected with a production pipe 7, and the production pipe 7 penetrates the sealing cover 2 and is connected with the core barrel 1; a boosting pipe 8 is connected to the side wall of the core barrel 1, and the boosting pipe 8 is connected with the core barrel 1, and a heating plate 9 is installed on the side wall of the core barrel 1.

[0027] The heating plate 9 is arc-shaped and symmetrically arranged about the booster pipe 8. Water is injected through the water injection pipe 5 to drive oil, and the saturated formation oil in the core 4 is driven into the production pipe 7. After a period of time, CO2 is injected through the gas injection pipe 6 to drive oil. The above operation is repeated to achieve alternating injection of water and gas, which can truly reflect the effect of water injection and CO2 injection after horizontal well fracturing.

[0028] Example 2

[0029] The utility model discloses a horizontal well carbon dioxide injection oil recovery simulation device, comprising a core barrel 1, a sealing rubber tube 3 is arranged in the core barrel 1, the central axis of the core barrel 1 coincides with the central axis of the sealing rubber tube 3, and the sealing rubber tube 3 is filled with a core 4; both ends of the core barrel 1 are connected with sealing covers 2, and the core 4 is fitted with the sealing covers 2; one end of the core barrel 1 is connected with a water injection pipe 5 and an air injection pipe 6, and the water injection pipe 5 and the air injection pipe 6 both penetrate the sealing cover 2 and are connected with the core barrel 1, and the other end of the core barrel 1 is connected with a production pipe 7, and the production pipe 7 penetrates the sealing cover 2 and is connected with the core barrel 1; a boosting pipe 8 is connected to the side wall of the core barrel 1, and the boosting pipe 8 is connected with the core barrel 1, and a heating plate 9 is installed on the side wall of the core barrel 1.

[0030] A first extension tube 11, a second extension tube 12 and a third extension tube 13 are provided in the core barrel 1. One end of the first extension tube 11 is connected to the water injection tube 5, and the other end of the first extension tube 11 cooperates with the placement hole 14. One end of the second extension tube 12 is connected to the gas injection tube 6, and the other end of the second extension tube 12 cooperates with the placement hole 14; one end of the third extension tube 13 is connected to the production tube 7, and the other end of the third extension tube 13 cooperates with the placement hole 14.

[0031] The angle formed by the first extension pipe 11 and the water injection pipe 5 is 90°-120°, the angle formed by the second extension pipe 12 and the gas injection pipe 6 is 90°-120°, and the angle formed by the third extension pipe 13 and the production pipe 7 is 90°-120°.

[0032] The boosting pipe 8 is externally connected to a boosting pump, and a pressure monitoring meter is provided at the output end of the boosting pump, which can deliver pressure as needed; the heating plate 9 is externally connected to a heating device, and a temperature monitoring device is provided at the output end of the heating device, which can adjust the output temperature in real time to meet the simulation needs.

[0033] Example 3

[0034] The utility model discloses a horizontal well carbon dioxide injection oil recovery simulation device, comprising a core barrel 1, a sealing rubber tube 3 is arranged in the core barrel 1, the central axis of the core barrel 1 coincides with the central axis of the sealing rubber tube 3, and the sealing rubber tube 3 is filled with a core 4; both ends of the core barrel 1 are connected with sealing covers 2, and the core 4 is fitted with the sealing covers 2; one end of the core barrel 1 is connected with a water injection pipe 5 and an air injection pipe 6, and the water injection pipe 5 and the air injection pipe 6 both penetrate the sealing cover 2 and are connected with the core barrel 1, and the other end of the core barrel 1 is connected with a production pipe 7, and the production pipe 7 penetrates the sealing cover 2 and is connected with the core barrel 1; a boosting pipe 8 is connected to the side wall of the core barrel 1, and the boosting pipe 8 is connected with the core barrel 1, and a heating plate 9 is installed on the side wall of the core barrel 1.

[0035] The core 4 is cylindrical, and a crack 10 is arranged in the core 4 . The crack 10 is arranged parallel to the central axis of the simulated core 4 . A placement hole 14 is arranged in the core 4 near the crack 10 .

[0036] A first extension tube 11, a second extension tube 12 and a third extension tube 13 are provided in the core barrel 1. One end of the first extension tube 11 is connected to the water injection tube 5, and the other end of the first extension tube 11 cooperates with the placement hole 14. One end of the second extension tube 12 is connected to the gas injection tube 6, and the other end of the second extension tube 12 cooperates with the placement hole 14; one end of the third extension tube 13 is connected to the production tube 7, and the other end of the third extension tube 13 cooperates with the placement hole 14.

Claims

1. A simulation device for injecting carbon dioxide into a horizontal well for oil recovery, characterized in that: The invention comprises a core barrel (1), wherein a sealing rubber tube (3) is arranged inside the core barrel (1), the central axis of the core barrel (1) coincides with the central axis of the sealing rubber tube (3), and the sealing rubber tube (3) is filled with a core (4); both ends of the core barrel (1) are connected with sealing covers (2), and the core (4) is fitted with the sealing covers (2); one end of the core barrel (1) is connected with a water injection pipe (5) and an air injection pipe (6), and the water injection pipe (5) and the air injection pipe (6) both penetrate the sealing cover (2) and are connected with the core barrel (1); the other end of the core barrel (1) is connected with a production pipe (7), and the production pipe (7) penetrates the sealing cover (2) and is connected with the core barrel (1); the side wall of the core barrel (1) is connected with a boosting pipe (8), and the boosting pipe (8) is connected with the core barrel (1); a heating plate (9) is installed on the side wall of the core barrel (1).

2. The horizontal well carbon dioxide injection oil recovery simulation device according to claim 1, characterized in that: The rock core (4) is in the form of a column, a crack (10) is provided in the rock core (4), and the crack (10) is arranged parallel to the central axis of the simulated rock core (4).

3. The horizontal well carbon dioxide injection oil recovery simulation device according to claim 2, characterized in that: A placement hole (14) is provided in the core (4) near the crack (10).

4. The horizontal well carbon dioxide injection oil recovery simulation device according to claim 3, characterized in that: The core barrel (1) is provided with a first extension tube (11), a second extension tube (12) and a third extension tube (13); one end of the first extension tube (11) is connected to the water injection tube (5), and the other end of the first extension tube (11) cooperates with the placement hole (14); one end of the second extension tube (12) is connected to the gas injection tube (6), and the other end of the second extension tube (12) cooperates with the placement hole (14); one end of the third extension tube (13) is connected to the production tube (7), and the other end of the third extension tube (13) cooperates with the placement hole (14).

5. The horizontal well carbon dioxide injection oil recovery simulation device according to claim 4, characterized in that: The angle formed by the first extension pipe (11) and the water injection pipe (5) is 90° to 120°, the angle formed by the second extension pipe (12) and the gas injection pipe (6) is 90° to 120°, and the angle formed by the third extension pipe (13) and the production pipe (7) is 90° to 120°.

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