Water-gas dispersion system flooding microscopic etching displacement device and experimental method thereof

Abstract

The invention discloses a water-gas dispersion system flooding microscopic etching displacement device and an experimental method thereof, the water-gas dispersion system flooding microscopic etching displacement device comprises a rock core holder, a false rock core is arranged in the rock core holder, and microbubble generating sheets are arranged at two ends of the false rock core; the input end of the core holder is respectively connected with the pressure sensor I, the gas source assembly and the water source assembly, and the output end of the core holder is connected with the microcosmic etching displacement observation device. The water-gas dispersion system oil displacement mechanism experiment analysis can be carried out, the water-gas dispersion system oil displacement mechanism research can be deeply understood, and the water-gas dispersion system mine displacement test can be guided; the water-gas dispersion system flooding understanding is improved, the change condition of the water-gas dispersion system flooding microbubbles in pores is determined, and the water-gas dispersion system flooding sweep volume expansion effect and the self-adaptive capacity of the microbubbles are accurately reflected.

Description

Technical Field

[0001] This invention relates to the field of water vapor dispersion system technology, and in particular to a device for driving micro-etching and displacement of water vapor dispersion system and its experimental method. Background Technology

[0002] The oil extraction process is divided into three stages: primary oil recovery, secondary oil recovery, and tertiary oil recovery. Primary and secondary oil recovery are both physical methods, which can typically recover 30%-40% of the crude oil. Common methods for tertiary oil recovery include gas drive, chemical flooding, microbial flooding, and heat recovery. Gas drive is an important means of improving oil recovery, but existing laboratory equipment does not meet the gas injection requirements of micro-etching displacement observation devices. Therefore, how to quickly and accurately simulate the mechanism through indoor experimental technology has become a research focus. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a micro-etching and displacement device and its experimental method for water-air dispersion system. Based on the principle of simple modification and achieving water-air dispersion, it can quickly and accurately analyze the oil displacement mechanism of water-air dispersion system through indoor experiments, determine the role of microbubbles in the pores of the dispersion system, and provide technical support for the large-scale promotion of water-air dispersion system displacement technology.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a water-air dispersion system micro-etching and displacement device, including a core holder, a fake core is provided inside the core holder, and microbubble generating plates are provided at both ends of the fake core; the input end of the core holder is connected to a pressure sensor, a gas source component, and a water source component respectively, and the output end of the core holder is connected to a micro-etching and displacement observation device.

[0005] Furthermore, the gas source components include a storage tank, a booster pump, and a medium gas source interface connected in sequence.

[0006] Furthermore, a needle valve and a medium pressure gauge are installed between the booster pump and the medium air source interface.

[0007] Furthermore, the booster pump is connected to the drive air source.

[0008] Furthermore, a tank pressure gauge, a needle valve II, a pressure regulating valve, an outlet pressure gauge, and a needle valve III are installed between the storage tank and the core holder.

[0009] Furthermore, the water source components include a piston container and a horizontal flow pump connected in sequence.

[0010] Furthermore, needle valve four and needle valve five are provided between the piston container and the core holder.

[0011] Furthermore, needle valve six and needle valve seven are provided between the piston container and the horizontal flow pump.

[0012] Furthermore, the micro-etching displacement observation device includes a micro-clamp, the input end of which is connected to the output end of the core clamp and the second pressure sensor, the second pressure sensor is connected to the input end of the annular pressure tracking pump, and the output end of the annular pressure tracking pump is connected to the annular pressure interface on the micro-clamp.

[0013] Furthermore, the micro-gripper, pressure sensor II, and core holder are connected via a six-way valve.

[0014] An experimental method for driving micro-etching and displacement using a water vapor dispersion system includes the following steps:

[0015] Step 1: Connect the water vapor dispersion system to the micro-etching and displacement device;

[0016] Step Two: System Detection;

[0017] Step 3: Experimental Procedure;

[0018] Step 4: Observation of experimental results.

[0019] Further, in step one, microbubble generators are installed at both ends of the fake core and filled into the core holder, and the gas source component, water source component, and micro-etching displacement observation device are connected.

[0020] Further, in step two, the airtightness between the gas source component, water source component, core holder, micro-etching displacement observation device, and pipeline is tested by releasing the gas in the storage tank.

[0021] Further, in step three, an etched glass slide with appropriate permeability is installed in the micro-etching displacement observation device. The injection pressure and injection volume are controlled by applying ring pressure through pressure sensor two and the ring pressure tracking pump. The four-way valve at the injection end is adjusted to a suitable water and air injection rate. A stable water and air dispersion system is formed through the modified water and air dispersion device. After the core holder outlet end is stable and the pressure value is normal, the core is injected into the micro-etching displacement observation device. The pressure change is continuously monitored to ensure that it does not exceed the pressure bearing range of the micro-etching displacement observation device.

[0022] Furthermore, in step four, the role of microbubbles in the pores of the dispersion system is observed and determined using a micro-etching displacement observation device.

[0023] The beneficial effects of this invention are: it enables experimental analysis of the oil displacement mechanism of water-gas dispersion systems, deepens the understanding of the oil displacement mechanism of water-gas dispersion systems, and guides field tests of water-gas dispersion systems; it improves the understanding of water-gas dispersion systems, determines the changes of microbubbles in the pores of water-gas dispersion systems, accurately reflects the effect of expanding the sweep volume of water-gas dispersion systems, and the self-adaptive ability of microbubbles. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] The components include: 1. Medium gas source interface; 2. Needle valve one; 3. Medium pressure gauge; 4. Storage tank pressure gauge; 5. Needle valve two; 6. Pressure regulating valve; 7. Outlet pressure gauge; 8. Needle valve three; 9. Pressure sensor one; 10. Core holder; 11. Six-way valve; 12. Micro-holding device; 13. Ring pressure tracking pump; 14. Pressure sensor two; 15. Needle valve four; 16. Needle valve five; 17. Piston container; 18. Needle valve six; 19. Needle valve seven; 20. Flow pump; 21. Storage tank; 22. Booster pump; 23. Drive gas source; 24. Microbubble generator; 25. Fake core. Detailed Implementation

[0027] The following will be combined with the appendix Figure 1 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially.

[0029] In the description of this invention, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only for distinction and should not be construed as indicating or implying relative importance.

[0030] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] A water-air dispersion system for micro-etching and displacement device includes a core holder 10, a fake core 25 is provided inside the core holder 10, and microbubble generating plates 24 are provided at both ends of the fake core 25; the input end of the core holder 10 is connected to a pressure sensor 9, an air source component, and a water source component, respectively, and the output end of the core holder 10 is connected to a micro-etching and displacement observation device.

[0032] The gas source assembly includes a storage tank 21, a booster pump 22, and a medium gas source interface 1 connected in sequence. A needle valve 2 and a medium pressure gauge 3 are installed between the booster pump 22 and the medium gas source interface 1. The booster pump 22 is connected to a drive gas source 23. A storage tank pressure gauge 4, a needle valve 5, a pressure regulating valve 6, an outlet pressure gauge 7, and a needle valve 8 are installed between the storage tank 21 and the core holder 10.

[0033] The water source assembly includes a piston container 17 and a horizontal flow pump 20 connected in sequence. A needle valve 4 15 and a needle valve 5 16 are provided between the piston container 17 and the core holder 10. A needle valve 6 18 and a needle valve 7 19 are provided between the piston container 17 and the horizontal flow pump 20.

[0034] The micro-etching displacement observation device includes a micro-gripper 12. The input end of the micro-gripper 12 is connected to the output end of the core holder 10 and the pressure sensor 14. The pressure sensor 14 is connected to the input end of the annular pressure tracking pump 13, and the output end of the annular pressure tracking pump 13 is connected to the annular pressure interface on the micro-gripper 12. The micro-gripper 12, the pressure sensor 14, and the core holder 10 are connected by a six-way valve 11.

[0035] The output end of the booster pump 22 is connected in parallel to the output end of the storage tank 21 through a pipeline; a pressure regulating valve 6 is installed on the output end of the storage tank 21, and the output end of the pressure regulating valve 6 is connected to the front end of the core holder 10; nitrogen or CO2 gas is installed in the storage tank 21, and nitrogen or CO2 gas is introduced into the core holder 10 through the pressure regulating valve 6.

[0036] The core holder 10 includes a reaction core holder body, a fake core 25, and microbubble generator 24; the core holder 10 is filled with a fake core 25 and microbubble generator 24 is installed at both ends to form a water-air dispersion system generating device.

[0037] The piston container 17 has a piston-type structure, which is divided into a driving chamber and a liquid storage chamber. The liquid storage chamber of the piston container 17 is connected to the core holder 10 through a four-way valve. The driving chamber of the piston container 17 is connected to the horizontal flow pump 20 through a back pressure pipe.

[0038] A ring pressure tracking pump 13 is connected to the micro gripper 12, and a pressure sensor 14 is installed at the front end of the micro gripper 12.

[0039] The output end of the core holder 10 is connected to the input end of the micro holder 12, and a liquid discharge pipe is provided on the output end of the micro holder 12.

[0040] To clarify the oil displacement mechanism of the water-gas dispersion system, indoor micro-etching experiments were conducted without altering the original experimental equipment. The gas and water source components were connected, and a micro-etching displacement observation device was used. Microbubble generators 24 were added to both ends of the dummy core 25 and filled into the core holder 10, effectively modifying the core holder 10 into a foam generator. Through pressure monitoring at the inlet end of the micro-slide and annular pressure tracking, simultaneous gas and water injection was achieved, realizing water-gas dispersion. Experimental results show that the experimental device can achieve simultaneous gas and water injection and generate stable nanoscale microbubbles. The water-gas dispersion system has the effect of expanding the swept volume and improving the recovery rate. Simultaneously, the microbubbles have self-adaptive capabilities; the bubbles, with their tiny diameters, enter the large pores of the rock, remain there, and coalesce, effectively blocking the large pores, achieving fluid flow diversion, and displacing residual oil at the blind end.

[0041] An experimental method for driving micro-etching and displacement using a water vapor dispersion system includes the following steps:

[0042] Step 1: Connection of the water-air dispersion system for micro-etching and displacement device: Install microbubble generator plates 24 at both ends of the fake core 25 and fill them into the core holder 10, then connect the gas source component, water source component, and micro-etching and displacement observation device.

[0043] Step 2: System testing: By releasing the gas in the storage tank 21, the airtightness between the gas source component, water source component, core holder 10, micro-etching displacement observation device and pipeline is tested.

[0044] Step 3: Experimental Procedure: Install an etched glass slide with appropriate permeability into the micro-etching displacement observation device. Apply ring pressure through pressure sensor 14 and ring pressure tracking pump 13 to control the injection pressure and injection volume. Adjust the four-way valve at the injection end to a suitable water and air injection rate. Form a stable water and air dispersion system through a modified water and air dispersion device. After the outlet end of the core holder 10 is stable and the pressure value is normal, inject into the micro-etching displacement observation device. Continuously monitor pressure changes to ensure that they do not exceed the pressure bearing range of the micro-etching displacement observation device.

[0045] Step 4: Observation of experimental results: The role of tiny bubbles in the pores of the dispersion system is determined by observing the micro-etching displacement observation device.

[0046] Experimental results show that after microbubbles accumulate in macropores for a long time, they will rupture and then merge into larger bubbles, blocking the macropores; microbubbles stretch and deform, and after prolonged contact in macropores, they will aggregate and form larger bubbles, which will expand the swept volume; adjacent bubbles will have brief contact without aggregation and merging; microbubbles will stay and accumulate in macropores, and after the pressure increases, they will flow uniformly and rapidly, which will play a role in diverting the liquid flow and promoting uniform propulsion.

[0047] The above experiments demonstrate that the water-air dispersion system has the effect of expanding the swept volume, while the microbubbles have self-adaptive capabilities. The bubbles, with their tiny diameters, enter the large pores of the rock and remain there, coalescing and blocking the large pores, thus achieving liquid flow diversion.

[0048] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims. Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no technical conflict, the features in the embodiments disclosed in the present invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for micro-etching and displacement using a water-air dispersion system, characterized in that, The device includes a core holder (10), which contains a fake core (25). The fake core (25) has microbubble generators (24) at both ends. The input end of the core holder (10) is connected to a pressure sensor (9), a gas source assembly, and a water source assembly, respectively. The output end of the core holder (10) is connected to a micro-etching and displacement observation device.

2. The water-air dispersion system micro-etching and displacement device according to claim 1, characterized in that, The gas source assembly includes a storage tank (21), a booster pump (22), and a medium gas source interface (1) connected in sequence.

3. The water-air dispersion system micro-etching and displacement device according to claim 2, characterized in that, A needle valve (2) and a medium pressure gauge (3) are provided between the booster pump (22) and the medium gas source interface (1).

4. The water-air dispersion system micro-etching and displacement device according to claim 2, characterized in that, The booster pump (22) is connected to the drive air source (23).

5. The water-air dispersion system micro-etching and displacement device according to claim 2, characterized in that, The storage tank (21) and the core holder (10) are equipped with a storage tank pressure gauge (4), a needle valve (5), a pressure regulating valve (6), an outlet pressure gauge (7), and a needle valve (8).

6. The water-air dispersion system micro-etching and displacement device according to claim 1, characterized in that, The water source assembly includes a piston container (17) and a horizontal flow pump (20) connected in sequence.

7. The water-air dispersion system micro-etching and displacement device according to claim 6, characterized in that, The piston container (17) and the core holder (10) are provided with needle valve four (15) and needle valve five (16).

8. The water-air dispersion system micro-etching and displacement device according to claim 6, characterized in that, A needle valve six (18) and a needle valve seven (19) are provided between the piston container (17) and the horizontal flow pump (20).

9. The water-air dispersion system micro-etching and displacement device according to claim 1, characterized in that, The micro-etching displacement observation device includes a micro-clamp (12). The input end of the micro-clamp (12) is connected to the output end of the core clamp (10) and the pressure sensor (14). The pressure sensor (14) is connected to the input end of the annular pressure tracking pump (13). The output end of the annular pressure tracking pump (13) is connected to the annular pressure interface on the micro-clamp (12).

10. The water-air dispersion system micro-etching and displacement device according to claim 9, characterized in that, The micro gripper (12), pressure sensor 2 (14), and core gripper (10) are connected by a six-way valve (11).

11. An experimental method for driving micro-etching and displacement using a water-air dispersion system, characterized in that, The water vapor dispersion system micro-etching and displacement device according to any one of claims 1-10 comprises the following steps: Step 1: Connect the water vapor dispersion system to the micro-etching and displacement device; Step Two: System Detection; Step 3: Experimental Procedure; Step 4: Observation of experimental results.

12. The experimental method for driving micro-etching and displacement using a water-air dispersion system according to claim 11, characterized in that, In step one, microbubble generator plates (24) are installed at both ends of the fake core (25) and filled into the core holder (10), and the gas source component, water source component, and micro-etching displacement observation device are connected.

13. The experimental method for driving micro-etching and displacement using a water-air dispersion system according to claim 11, characterized in that, In step two, the gas in the storage tank (21) is released to test the air tightness between the gas source component, water source component, core holder (10), micro-etching displacement observation device and pipeline.

14. The experimental method for driving micro-etching and displacement using a water-air dispersion system according to claim 11, characterized in that, In step three, an etched glass slide with appropriate permeability is installed in the micro-etching displacement observation device. The injection pressure and injection volume are controlled by applying ring pressure through pressure sensor two (14) and ring pressure tracking pump (13). The four-way valve at the injection end is adjusted to a suitable water and air injection speed. A stable water and air dispersion system is formed through the modified water and air dispersion device. After the outlet end of the core holder (10) is stable and the pressure value is normal, the core is injected into the micro-etching displacement observation device. The pressure change is continuously monitored to ensure that it does not exceed the pressure bearing range of the micro-etching displacement observation device.

15. The experimental method for driving micro-etching and displacement using a water-air dispersion system according to claim 11, characterized in that, Step four involves observing and determining the role of tiny bubbles in the pores of the dispersion system using a micro-etching displacement observation device.

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