Visualization device and system for quantitative characterization of gas production capacity of rock bedding and application of visualization device and system

Abstract

The invention discloses a visual device and system for quantitative characterization of gas production capacity of rock bedding and application of the visual device and system. The visual device can comprise a visual container assembly, a gas supply assembly and a pressure adjusting mechanism, the visual container assembly can comprise a visual container provided with a liquid injection opening, a plurality of baffles arranged in the visual container and a plurality of gas production valves installed on the visual container and located between the adjacent baffles. The gas supply assembly can comprise a centralizing sealing sleeve and a plug, the centralizing sealing sleeve is connected to the side face of the visual container, one end of the plug penetrates through the centralizing sealing sleeve and extends into the visual container, and the other end of the plug is connected with a pressure adjusting mechanism. The pressure adjusting mechanism acts on the plug so as to apply axial pressure to the tested columnar rock core in the visual container; a gas channel is formed in the plug and is used for injecting gas into the tested columnar rock core so as to analyze the influence of the flowing capacity, the gas production rule and the yield of bedding and bedding seams.

Description

Technical Field

[0001] The present invention relates to the technical field of shale oil and gas exploration and development, and particularly relates to a visualization device, system and application for quantitatively characterizing the gas production capacity of rock bedding. Background Art

[0002] Nearly horizontal bedding fractures are commonly developed in shale oil and gas reservoirs. Bedding fractures are important reservoir spaces and seepage channels in shale reservoirs, which affect the enrichment of oil and gas in shale, the productivity of single wells and the development effect. Bedding is a layered structure generated by the vertical change of sedimentary rocks due to changes in sedimentary environment or sedimentary processes during sedimentation, which is mainly manifested by the changes in the mineral composition, structure and color of rocks, and bedding is a mechanically weak plane formed when rocks are deposited. During sedimentation and diagenesis, due to various geological processes, bedding fractures are easily formed along the bedding planes in rocks. The bedding in shale is sheet-like bedding, abbreviated as bedding plane. The bedding fractures in shale are usually also called bedding plane fractures, which are natural fractures formed along the bedding plane during the sedimentation and diagenesis of mud shale. Bedding is a sedimentary structure developed in a weak hydrodynamic environment in argillaceous rocks, formed by the directional arrangement of fine-grained minerals. The horizontal bedding with a thickness less than 1 cm is usually called bedding or sheet-like bedding; the micro-horizontal bedding structure with a thickness less than 1 mm is called texture or lamina. Bedding is the habit of rocks to easily split into thin plates or flakes along the parallel bedding planes. The bedding plane is also a mechanically weak plane in shale, which is the plane where rocks are most likely to break. Therefore, the bedding fractures in shale are mainly distributed along these extremely thin horizontal bedding planes.

[0003] At present, the distribution prediction of nearly horizontal bedding fractures has attracted more and more attention in exploration. The flow capacity of cores with developed bedding is often several times to dozens of times that of cores with underdeveloped bedding. At the same time, bedding and bedding fractures are more sensitive to the change of overlying pressure. Summary of the Invention

[0004] In order to more conveniently observe and analyze the flow capacity and gas production law of rock bedding, as well as the influence on production, and increase the selection space, the present invention provides a visualization device, system and application for quantitatively characterizing the gas production capacity of rock bedding.

[0005] In a first aspect, an embodiment of the present invention provides a visualization device for quantitatively characterizing the gas production capacity of rock bedding, which may include: a visualization container assembly, a gas supply assembly and a pressure regulating mechanism;

[0006] Wherein, the visualization container assembly may include: a visualization container provided with a liquid injection port, a plurality of baffles arranged inside the visualization container, and a plurality of gas extraction valves installed on the visualization container and located between adjacent baffles;

[0007] The gas supply assembly may include: a centering seal sleeve and a plug. The centering seal sleeve is connected to the side of the visualization container. One end of the plug penetrates through the centering seal sleeve and extends into the visualization container, and the other end of the plug is connected to the pressure regulating mechanism to apply an axial pressure to the tested columnar core located in the visualization container through the pressure regulating mechanism.

[0008] A gas passage is provided on the plug for injecting gas into the tested columnar core.

[0009] Optionally, the pressure regulating mechanism may include: a regulating mechanism fixing component, a regulating rod, a regulating handle, and a pressure sensor.

[0010] The regulating mechanism fixing component is sleeved outside the visualization container. One end of the pressure sensor is connected to the plug, and the other end is connected to the regulating rod.

[0011] The regulating rod penetrates through the support member of the regulating mechanism fixing component and is connected to the regulating handle.

[0012] The regulating handle drives the regulating rod to move under an external force, so that the regulating rod acts on the pressure sensor and the plug to apply an axial pressure to the tested columnar core.

[0013] Optionally, there are two regulating handles, and the two regulating handles are hinged to the regulating rod.

[0014] Optionally, the regulating mechanism fixing component may include: a first end face fixing member, a second end face fixing member, a support member, and several connecting tie rods.

[0015] The first end face fixing member and the second end face fixing member are respectively located on opposite sides of the visualization container, and the first end face fixing member and the second end face fixing member are connected by a plurality of the connecting tie rods, so that the first end face fixing member and the second end face fixing member are fixed to the visualization container axially; a through hole for accommodating the centering seal sleeve and the plug is provided on the second end face fixing member.

[0016] The support member is fixed to the second end face fixing member by a plurality of the connecting tie rods, and the regulating rod penetrates through the support member and is respectively connected to the pressure sensor and the regulating handle.

[0017] Optionally, an openable and closable air vent is provided at the central part of the first end face fixing member, and the air vent is communicated with the visualization container.

[0018] Optionally, the visualization container is columnar, and the baffle is arranged perpendicular to the central axis of the visualization container.

[0019] Optionally, the visualization container component may further include: two sealing gaskets; one sealing gasket is located between the plug and the tested columnar core, and the other sealing gasket is located between the inner side wall of the visualization container and the tested columnar core.

[0020] Optionally, a core centering rod is provided in the visualization container so that the central axis of the tested columnar core placed in the visualization container is located on the central axis of the visualization container.

[0021] In a second aspect, an embodiment of the present invention provides a test system for quantitatively characterizing the gas production capacity, which may include: a flow meter, a gas supply device, and a visualization device for quantitatively characterizing the gas production capacity of rock bedding as described in the first aspect; wherein, the flow meter is connected to the gas collection valve, and the gas supply device is communicated with the gas passage of the plug.

[0022] Optionally, the system may further include: a video recording device, and the lens of the video recording device faces the visualization container to analyze the gas outlet conditions of different bedding surfaces of the tested columnar core.

[0023] In a third aspect, an embodiment of the present invention provides a test method for quantitatively characterizing the gas production capacity of shale bedding, which is implemented based on the test system for quantitatively characterizing the gas production capacity described in the second aspect, and may include:

[0024] Select a full-diameter shale core as the tested columnar core, and drill a through hole for gas injection on the central axis of the tested columnar core;

[0025] Place the tested columnar core in the visualization container so that the through hole communicates with the gas passage opened on the plug;

[0026] Inject distilled water into the visualization container through the liquid injection port on the visualization container until the tested columnar core is completely immersed in the distilled water, and the lower edge of the baffle provided inside the visualization container is below the liquid level;

[0027] Inject adsorbable methane gas into the tested columnar core through the gas supply device and the gas passage;

[0028] After the gas outlet at different positions on the surface of the tested columnar core is stable, use a flow meter to segmentally measure the gas volume of the bedding surfaces corresponding to different gas collection valves;

[0029] Adjust the axial pressure of the tested columnar core through the pressure regulating mechanism, and use a flow meter to segmentally repeat the measurement of the gas volume of the bedding surfaces corresponding to different gas collection valves to analyze the contribution rate of different bedding surfaces to gas production under different axial pressure conditions.

[0030] Optionally, the selection of the full-diameter shale core as the tested columnar core includes: separately selecting full-diameter shale cores with developed bedding, relatively developed bedding, and undeveloped bedding as the tested columnar cores to analyze the gas production capacity of shales with different degrees of bedding development.

[0031] Fourthly, an embodiment of the present invention provides an application of the visualization device for quantitatively characterizing the gas production capacity of rock bedding in a test system for quantitatively characterizing the gas production capacity.

[0032] The beneficial effects of the above technical solutions provided in the embodiments of the present invention at least include:

[0033] An embodiment of the present invention provides a visualization device, system and application for quantitatively characterizing the gas production capacity of rock bedding. The visualization device adjusts the axial pressure through a pressure regulating mechanism to simulate different overburden pressures underground, and then analyzes the influence of different overburden pressures on the flow capacity, gas production law and output of bedding and bedding joints, so as to reflect the sensitivity of different overburden pressure changes to bedding or bedding joints.

[0034] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written specification and the drawings.

[0035] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0036] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0037] Figure 1 is a structural diagram of the visualization device provided in the embodiment of the present invention;

[0038] Figure 2 is a sectional view of the visualization container provided in the embodiment of the present invention;

[0039] Figure 3 is a schematic diagram of the contribution rate of the bedding flow at different positions to the total gas production provided in the embodiment of the present invention;

[0040] Among them, 1 - visualization device; 2 - tested columnar core;

[0041] 11 - visualization container assembly; 12 - gas supply assembly; 13 - pressure regulating mechanism;

[0042] 111 - Visualization container; 112 - Baffle; 113 - Gas extraction valve; 114 - Sealing gasket; 115 - Core centering rod; 121 - Centering and sealing sleeve; 122 - Plug; 1111 - Liquid injection port; 1221 - Gas passage;

[0043] 131 - Adjusting mechanism fixing component; 132 - Adjusting rod; 133 - Adjusting handle; 134 - Pressure sensor;

[0044] 1311 - First end face fixing part; 1312 - Second end face fixing part; 1313 - Support part; 1314 - Connecting pull rod; 13111 - Air vent hole; 13121 - Through hole. Detailed implementation mode

[0045] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] The inventors found that currently, due to the lack of effective technical methods, the causes and main controlling factors of bedding fractures are not yet clearly understood, and it is impossible to effectively simulate the flow capacity of bedding under different overburden pressures. Therefore, the embodiments of the present invention aim to establish a visualization experimental device for bedding cores, and by changing the injection pressure and overburden pressure, analyze the flow capacity of bedding, the gas production law, and its influence on production. In view of the above problems, the present invention is proposed to provide a visualization device, system, and its application for quantitatively characterizing the gas production capacity of rock bedding, which can overcome or at least partially solve the above problems.

[0049] In an embodiment of the present invention, a visualization device for quantitatively characterizing the gas production capacity of rock bedding is provided. As shown in Figure 1 the visualization device 1 may include: a visualization container assembly 11, a gas supply assembly 12, and a pressure regulating mechanism 13; wherein, the visualization container assembly may include: a visualization container 111 provided with a liquid injection port 1111, a plurality of baffles 112 disposed inside the visualization container 111, and a plurality of gas collection valves 113 installed on the visualization container 111 and located between adjacent baffles 112; the gas supply assembly 12 may include: a centralizing and sealing sleeve 121 and a plug 122, the centralizing and sealing sleeve 121 is connected to the side of the visualization container 111, one end of the plug 122 penetrates through the centralizing and sealing sleeve 121 and extends into the visualization container 111, and the other end of the plug 122 is connected to the pressure regulating mechanism 13 to apply an axial pressure to the tested columnar core 2 located in the visualization container 111 through the pressure regulating mechanism 13 acting on the plug 122; a gas channel 1221 is provided on the plug 122 for injecting gas into the tested columnar core 2.

[0050] It should be noted that before the tested columnar core is placed into the visualization container in this embodiment, a drilling operation is required, that is, a through hole for gas injection is drilled on the central axis of the tested columnar core to facilitate communication with the gas channel of the plug, so that the externally injected methane gas enters the tested columnar core through this through hole. It should also be noted that the position of the above-mentioned baffle in the visualization container in this embodiment can preferably be adjusted to separate different beddings or bedding fractures of the tested columnar core, so that the gas flowing out of different beddings or bedding fractures can be collected through the gas collection valves between adjacent baffles.

[0051] Furthermore, it should be noted that the above-mentioned visualization container in this embodiment can be an integral body with both ends completely closed, or can be closed by a first end face fixing member and a second end face fixing member of the pressure regulating mechanism with both ends open. This embodiment does not make specific limitations on this. The gas channel on the above-mentioned plug is located at the central part of the plug, and this channel opens on the side of the plug to inject gas.

[0052] The working process of the above visualization device in the embodiment of the present invention is as follows: Place the tested cylindrical core into the visualization container, inject distilled water through the liquid injection port to completely immerse the tested cylindrical core, and the lower end of the baffle is below the liquid level of the distilled water; then pressurize through the pressure regulating mechanism to simulate different overburden pressures, and inject methane gas through the gas channel on the plug to observe the gas production of different bedding or bedding joints.

[0053] As an experimental device for measuring the gas production of bedding in core samples, the above visualization device in the embodiment of the present invention can adjust the axial pressure through the pressure regulating mechanism to simulate the overburden pressures at different underground positions, and then analyze the effects of different overburden pressures on the flow capacity, gas production law and output of bedding and bedding joints, so as to reflect the sensitivity of different overburden pressure changes to bedding or bedding joints.

[0054] In an alternative embodiment, referring to Figure 1 As shown, the pressure regulating mechanism 13 may include: a regulating mechanism fixing component 131, a regulating rod 132, a regulating handle 133 and a pressure sensor 134; the regulating mechanism fixing component 131 is sleeved outside the visualization container 111, one end of the pressure sensor 134 is connected to the plug 122, and the other end is connected to the regulating rod 132; the regulating rod 132 passes through the support member 1313 of the regulating mechanism fixing component 131 and is connected to the regulating handle 133; the regulating handle 133 drives the regulating rod 132 to move under the action of an external force, so that the regulating rod 132 acts on the pressure sensor 134 and the plug 122 to apply an axial pressure to the tested cylindrical core 2.

[0055] For the above pressure regulating mechanism in the embodiment of the present invention, the regulating mechanism fixing component is fixed to the visualization container component to facilitate the pressure regulating mechanism to apply an axial pressure; the above pressure sensor is used to measure the pressure values of different axial pressures to simulate different overburden pressures of the formation; the above regulating rod and regulating handle cooperate to apply pressure to the plug and then act on the tested cylindrical core, so as to simulate the effects of different overburden pressures on the flow capacity, gas production law and output of bedding.

[0056] In another alternative embodiment, referring to Figure 1 As shown, there are two regulating handles 133, and the two regulating handles 133 are hinged to the regulating rod 132. In this embodiment, by manually squeezing the two regulating handles, the regulating rod can be driven to increase different axial pressure values. For example, increase the pressure to 5 MPa, 10 MPa, 20 MPa, 30 MPa, etc. in sequence, and analyze the effects of different axial pressures (overburden pressures) on the gas production of shale bedding or bedding joints.

[0057] In another alternative embodiment, referring to Figure 1As shown, the adjustment mechanism fixing assembly 131 may include: a first end surface fixing member 1311, a second end surface fixing member 1312, a support member 1313 and a plurality of connecting rods 1314; the first end surface fixing member 1311 and the second end surface fixing member 1312 are respectively located on opposite sides of the visualization container 111, and the first end surface fixing member 1311 and the second end surface fixing member 1312 are connected by a plurality of connecting rods 1314, so that the first end surface fixing member 1311 and the second end surface fixing member 1312 are axially fixed to the visualization container 111; the second end surface fixing member 1312 is provided with a through hole 13121 for accommodating the straightening sealing sleeve 121 and the plug 122; the support member 1313 is fixed to the second end surface fixing member 1312 by a plurality of connecting rods 1314, and the adjustment rod 132 passes through the support member 1313 and is respectively connected to the pressure sensor 134 and the adjustment handle 133.

[0058] The above-mentioned adjustment mechanism fixing component provided in the embodiment of the present invention is fixed to the visualization container component on the one hand, serving as the force support point of the adjustment handle and the adjustment rod in the pressure adjustment mechanism, and on the other hand, it plays a protective role for the visualization container. The two ends of the visualization container are fixed and sealed by the first end surface fixing member and the second end surface fixing member, and then multiple ( Figure 1 The first end surface fixing member and the second end surface fixing member are connected by a connecting rod to realize axial pressure support of the visualization container. An adjustment rod and an adjustment handle are arranged on one side of the second end surface fixing member to apply axial pressure to the tested columnar core through their cooperation.

[0059] In another alternative embodiment, referring to Figure 1 As shown, the central part of the first end surface fixing member 1311 is provided with an openable and closable air leakage hole 13111, and the air leakage hole 13111 is connected to the visualization container 111. The air leakage hole in this embodiment can be used to discharge the gas injected into the tested columnar core, and the gas injection pressure can also be adjusted to achieve the purpose of safety testing.

[0060] In another alternative embodiment, referring to Figure 1 As shown, the visualization container 111 is columnar, and the baffle 112 is arranged perpendicular to the central axis of the visualization container 111. The visualization container in this embodiment is made of transparent pressure-resistant material and is columnar (e.g., a transparent pressure-resistant barrel), and the specific material may be tempered glass, hard plastic, etc. In this embodiment, the diameter of the visualization container is not less than 20 cm, so as to be suitable for tested columnar cores of multiple sizes.

[0061] In another alternative embodiment, referring to Figure 1As shown, the visualization container component 11 may further include: two sealing gaskets 114; one sealing gasket 114 is located between the plug 122 and the tested columnar core 2, and the other sealing gasket 114 is located between the inner side wall of the visualization container 111 and the tested columnar core 2. The above-mentioned sealing gaskets in this embodiment can protect and seal the contact surface of the tested columnar core.

[0062] In another alternative embodiment, referring to Figure 1 and Figure 2 As shown, a core centering rod 115 is provided in the above-mentioned visualization container 111 so that the central axis of the tested columnar core 2 placed in the visualization container 111 is located on the central axis of the visualization container 111. Preferably, the position of the core centering rod in this embodiment can be adjusted to adapt to tested columnar cores of different diameters, so that the tested columnar core is located on the central axis of the visualization container; at the same time, the above-mentioned core centering rod can prevent the tested columnar core from abutting against the inner wall of the visualization container, thus avoiding the gas flowing out from bedding or bedding joints being difficult to observe.

[0063] Based on the same inventive concept, an embodiment of the present invention also provides a test system for quantitatively characterizing the gas production capacity, which may include: a flowmeter, a gas supply device, and the above-mentioned visualization device for quantitatively characterizing the gas production capacity of rock bedding; wherein, the flowmeter is connected to the gas collection valve, and the gas supply device is communicated with the gas channel of the plug.

[0064] The above-mentioned gas supply device in this embodiment is used to inject methane gas into the visualization device, and the above-mentioned flowmeter is used to measure the gas volume flowing out from different bedding or bedding joints to analyze the gas production capacity of the bedding or bedding joints.

[0065] In another alternative embodiment, the above-mentioned system may further include: a video recording device, and the lens of the video recording device faces the visualization container to analyze the gas outlet conditions of different bedding surfaces of the tested columnar core. The above-mentioned video recording device is used to observe the gas outlet conditions at different positions on the surface of the tested columnar core, and then segment and collect and statistically analyze the gas volume of different bedding or bedding surfaces after the gas outlet is stable.

[0066] Based on the same inventive concept, an embodiment of the present invention also provides a test method for quantitatively characterizing the gas production capacity of shale bedding, which is implemented based on the above-mentioned test system for quantitatively characterizing the gas production capacity, and may include the following steps:

[0067] Step 1: Select a full-diameter shale core as the tested columnar core, and drill a through hole for gas injection on the central axis of the tested columnar core.

[0068] In this step, when selecting the full-diameter shale core as the tested columnar core, specifically, the full-diameter shale cores with developed bedding, relatively developed bedding, and undeveloped bedding can be selected as the tested columnar cores respectively to analyze the gas production capacity of shales with different degrees of bedding development. In this embodiment, the above-mentioned full-diameter shale cores with relatively developed bedding and undeveloped bedding are used as a comparison to analyze the gas production capacity of shale cores with developed bedding at different degrees of bedding development.

[0069] In specific implementation, a full-diameter shale core with a diameter of 10 cm and a length of 9.5 cm is selected as the tested columnar core, and a through-hole with a diameter of 0.2 - 0.5 cm is drilled on the central axis of the tested columnar core for gas injection.

[0070] Step 2: Place the tested columnar core into the visualization container so that the through-hole communicates with the gas channel opened on the plug.

[0071] Step 3: Inject distilled water into the visualization container through the liquid injection port on the visualization container until the tested columnar core is completely immersed in the distilled water, and the lower edge of the baffle arranged inside the visualization container is located below the liquid level.

[0072] Before injecting distilled water in this step, different axial pressures can be applied to the tested columnar core through the pressure regulating mechanism. For example, the axial pressure is initially increased to 5 MPa, and then distilled water is added to immerse the tested columnar core and the liquid level immerses the lower edge of the baffle.

[0073] Step 4: Inject adsorbable methane gas into the tested columnar core through the gas supply device and the gas channel. In this step, methane gas is injected at a constant injection pressure of 0.3 MPa. The video recording device is used to observe the bubbling and gas outlet conditions on the bedding surface of the tested columnar core, and the video recording device is used to record the gas outlet conditions while opening all the gas collection valves.

[0074] Step 5: After the gas outlet at different positions on the surface of the tested columnar core becomes stable, use a flowmeter to segmentally measure the gas volume of the bedding surface corresponding to different gas collection valves.

[0075] Step 6: Adjust the axial pressure of the tested columnar core through the pressure regulating mechanism, and use a flowmeter to segmentally repeat the measurement of the gas volume of the bedding surface corresponding to different gas collection valves to analyze the contribution rate of different beddings to gas production under different axial pressure conditions.

[0076] In this step, the axial pressure can be increased to 10 MPa, 20 MPa, 30 MPa, etc. in sequence, and the gas outlet conditions of each point (bedding or bedding joint) are repeatedly observed to analyze the influence of different axial pressures (overburden pressure) on gas production from shale bedding or bedding joints.

[0077] In a specific example, refer to Figure 3As shown, it is a schematic diagram of the contribution of the flow rates of bedding planes (5 bedding planes) at different positions of a specific shale sample to the total gas production volume. Furthermore, under different injection pressures and overburden pressures, the flow capacity of the bedding planes, the gas production law, and their impacts on production can be analyzed.

[0078] Based on the same inventive concept, an embodiment of the present invention also provides an application of a visualization device for quantitatively characterizing the gas production capacity of the above-mentioned rock bedding planes in a test system for quantitatively characterizing the gas production capacity.

[0079] For the specific descriptions and beneficial effects of the above-mentioned test system for quantitatively characterizing the gas production capacity, the test method for quantitatively characterizing the gas production capacity of shale bedding planes, and the application provided in the embodiments of the present invention, reference can be made to the relevant content of the visualization device for quantitatively characterizing the gas production capacity of rock bedding planes above. The embodiments of the present invention will not be elaborated herein.

[0080] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A visualization device for quantitatively characterizing the gas production capacity of rock bedding, characterized in that, Comprising: A visualization container component, a gas supply component, and a pressure regulating mechanism; Wherein, the visualization container component includes: a visualization container provided with a liquid injection port, a plurality of baffles arranged inside the visualization container, and a plurality of gas sampling valves installed on the visualization container and located between adjacent baffles; The gas supply component includes: a centering and sealing sleeve and a plug. The centering and sealing sleeve is connected to the side of the visualization container. One end of the plug penetrates through the centering and sealing sleeve and extends into the visualization container, and the other end of the plug is connected to the pressure regulating mechanism to apply axial pressure to the tested columnar core located in the visualization container through the action of the pressure regulating mechanism on the plug; A gas passage is provided on the plug for injecting gas into the tested columnar core.

2. The device according to claim 1, characterized in that, The pressure regulating mechanism includes: a regulating mechanism fixing component, a regulating rod, a regulating handle, and a pressure sensor; The regulating mechanism fixing component is sleeved outside the visualization container. One end of the pressure sensor is connected to the plug, and the other end is connected to the regulating rod; The regulating rod penetrates through the support member of the regulating mechanism fixing component and is connected to the regulating handle; The regulating handle drives the regulating rod to move under the action of an external force, so that the regulating rod acts on the pressure sensor and the plug to apply axial pressure to the tested columnar core.

3. The device according to claim 2, characterized in that, There are two regulating handles, and the two regulating handles are hinged to the regulating rod.

4. The device according to claim 2, characterized in that, The regulating mechanism fixing component includes: a first end face fixing member, a second end face fixing member, a support member, and a plurality of connecting tie rods; The first end face fixing member and the second end face fixing member are respectively located on opposite sides of the visualization container, and the first end face fixing member and the second end face fixing member are connected by a plurality of the connecting tie rods, so that the first end face fixing member and the second end face fixing member are fixed to the visualization container axially; a through hole for accommodating the centering and sealing sleeve and the plug is provided on the second end face fixing member; The support member is fixed to the second end face fixing member by a plurality of the connecting tie rods, and the regulating rod penetrates through the support member and is respectively connected to the pressure sensor and the regulating handle.

5. The device according to claim 4, characterized in that, An openable air vent is provided at the central part of the first end face fixing member, and the air vent is communicated with the visualization container.

6. The device according to any one of claims 1 to 5, characterized in that, The visualization container is columnar, and the baffles are arranged perpendicular to the central axis of the visualization container.

7. The device according to any one of claims 1 to 5, characterized in that, The visualization container component further includes: two sealing rubber pads; one sealing rubber pad is located between the plug and the tested columnar core, and the other sealing rubber pad is located between the inner side wall of the visualization container and the tested columnar core.

8. The device according to any one of claims 1 to 5, characterized in that, A core centering rod is provided in the visualization container so that the central axis of the tested columnar core placed in the visualization container is located on the central axis of the visualization container.

9. A test system for quantitatively characterizing the gas production capacity, characterized in that, Comprising: A flow meter, a gas supply device, and a visualization device for quantitatively characterizing the gas production capacity of rock bedding as described in any one of claims 1 to 8; wherein, the flow meter is connected to the gas sampling valve, and the gas supply device is communicated with the gas passage of the plug.

10. The system according to claim 9, characterized in that, Further included are: a video recording device, the lens of the video recording device facing the visualization container to analyze the gas emission conditions of different bedding planes of the tested columnar core.

11. A test method for quantitatively characterizing the gas production capacity of shale bedding, characterized in that, This method is implemented based on the gas production capacity quantitative characterization test system as described in claim 9 or 10, and includes: selecting a full-diameter shale core as the tested columnar core, and drilling a through hole for gas injection on the central axis of the tested columnar core; placing the tested columnar core into the visualization container so that the through hole communicates with the gas passage opened on the plug; injecting distilled water into the visualization container through the liquid injection port on the visualization container until the tested columnar core is completely immersed in the distilled water, and the lower edge of the baffle arranged inside the visualization container is below the liquid level; injecting adsorbable methane gas into the tested columnar core through the gas supply device and the gas passage; after the gas emission at different positions on the surface of the tested columnar core is stable, using a flowmeter to segmentally measure the gas volume of the bedding planes corresponding to different gas extraction valves; adjusting the axial pressure of the tested columnar core through the pressure regulating mechanism, and using a flowmeter to segmentally repeat the measurement of the gas volume of the bedding planes corresponding to different gas extraction valves to analyze the contribution rate of different bedding planes to gas production under different axial pressure conditions.

12. The method according to claim 11, characterized in that, The selection of the full-diameter shale core as the tested columnar core includes: respectively selecting full-diameter shale cores with well-developed bedding, relatively well-developed bedding, and poorly-developed bedding as the tested columnar cores to analyze the gas production capacity of shales with different bedding development degrees.

13. Application of a visualization device for quantitatively characterizing the gas production capacity of rock bedding as described in any one of claims 1 to 8 in a test system for quantitatively characterizing the gas production capacity.

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