Deep reservoir rock mass multidirectional seepage auxiliary sample loading sealing device

Abstract

The application provides a deep reservoir rock mass multidirectional seepage auxiliary sample loading sealing device, which comprises a supporting base, a limiting frame and a glue injection frame. The top surface of the supporting base is provided with a rectangular groove for placing a rectangular pressing block. The top of the supporting base is provided with four supporting columns for supporting the glue injection frame. The limiting frame comprises a top limiting horizontal rod and four L-shaped limiting rods. The horizontal parts of the four L-shaped limiting rods can be clamped into the four clamping grooves of the supporting base respectively. The vertical parts of the four L-shaped limiting rods are provided with horizontal supporting platforms for supporting the rectangular pressing block. The two ends of the top limiting horizontal rod are connected with the top of two L-shaped limiting rods, and are used for pressing the rectangular pressing block on the top from top to bottom. The glue injection frame is a cubic frame structure for placing a cubic sample. The glue injection frame is provided with glue holes. Six hollow surfaces of the glue injection frame can be used for six rectangular pressing blocks to be respectively attached and sealed with the periphery of the rectangular pressing block. The application can realize three-axis multidirectional efficient flexible sealing of the reservoir rock mass, and provides reliable sealing guarantee for multidirectional permeability test.

Description

Technical Field

[0001] This invention relates to the fields of rock mechanics and engineering technology, and in particular to a multi-directional seepage auxiliary sample loading and sealing device for deep reservoir rock masses. Background Technology

[0002] Studying the permeability of deep reservoirs is one of the core challenges in the energy sector, including oil, shale gas, and coalbed methane. Permeability characterizes the ability of rocks to allow fluids to pass through them and is a key factor in assessing the gas-bearing, oil-bearing, and flow development properties of reservoirs. Understanding reservoir permeability not only determines the difficulty of resource extraction but also directly affects extraction efficiency and costs.

[0003] In the study of deep reservoir permeability, traditional experimental methods often fail to realistically simulate underground three-dimensional high stress and multi-directional flow conditions, resulting in a significant discrepancy between experimental results and actual conditions.

[0004] Therefore, developing relevant equipment and technologies for testing the three-dimensional permeability of deep reservoirs has become particularly important. The newly developed multi-directional permeability testing technology under three-dimensional stress can overcome the limitations of traditional testing methods. By simulating real underground conditions, it can more accurately assess the permeability of deep reservoirs, providing more accurate data support for resource exploration and development. A key aspect of this multi-directional permeability testing under three-dimensional stress is ensuring effective sealing of the reservoir rock mass to achieve uniform flow of high-pressure fluid. In particular, multi-directional permeability testing requires ensuring the injection of high-pressure fluid from different directions, making sealing more challenging and demanding.

[0005] Most existing devices for testing the permeability of deep reservoir rocks use flexible sealing membranes to wrap the core samples. This method can only inject fluid in the axial direction to conduct permeability tests in that direction. However, multi-directional permeability testing under three-dimensional stress in reservoirs requires the injection of high-pressure fluid from different stress directions. This necessitates ensuring a sealed environment around the sample while allowing for multi-directional fluid flow. Therefore, there is an urgent need to develop a three-dimensional sealing technology for deep reservoir rock masses that is compatible with three-dimensional multi-directional permeability testing equipment, providing technical support for seepage testing under three-dimensional stress in deep reservoirs. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, the present invention provides a multi-directional seepage auxiliary sample loading and sealing device for deep reservoir rock mass.

[0007] This invention is achieved through the following technical solution:

[0008] The multi-directional seepage auxiliary sample loading and sealing device for deep reservoir rock mass provided in this application includes a support base, a limiting frame, and an injection frame. The top surface of the support base has a rectangular groove for placing a rectangular pressure block at the bottom. The bottom of the rectangular groove is provided with four sets of threaded through holes. A slot is provided in each of the four directions of the bottom of the support base, and the four sets of threaded through holes are connected to one of the slots. The top of the support base has four support columns, which are located on the outer sides of the four sides of the rectangular groove. The support columns are used to support the injection frame.

[0009] The limiting frame includes a top limiting crossbar and four L-shaped limiting rods. The vertical sections of the four L-shaped limiting rods have transverse support platforms on their inner sides, which support four lateral rectangular pressure blocks. The horizontal sections of the four L-shaped limiting rods can be individually inserted into four slots in the support base. The horizontal sections of the L-shaped limiting rods have matching screw holes corresponding to the threaded through holes. The two ends of the top limiting crossbar can be connected to the tops of two opposite L-shaped limiting rods using screws. The top limiting crossbar is used to press down on the top rectangular pressure block from above.

[0010] The glue injection frame is a cubic frame structure that can accommodate cubic samples. The glue injection frame has 12 edges and glue holes at the bottom and top. The six hollowed-out surfaces of the glue injection frame allow six rectangular pressure blocks to fit into each other and form a seal around the rectangular pressure blocks.

[0011] Optionally, the support base is a rectangular structure, with four support columns located on the four sides of the top of the support base.

[0012] Optionally, the entire glue injection frame is designed to be detachable.

[0013] Optionally, the glue injection frame includes a bottom square frame, a top square frame, and four columns in the middle, with two square frames and four columns connected by screws; each of the two square frames has a glue hole on one side.

[0014] Optionally, the inner sides of the 12 edges of the glue injection frame are circular arc-shaped grooves.

[0015] Optionally, the tops of two adjacent support columns are L-shaped structures with a lower inner section and a higher outer section, which can be used to support the glue injection frame and serve as a limit, while the tops of the other two support columns are flat structures.

[0016] Optionally, a threaded push rod is installed in a horizontal hole on the vertical part of the L-shaped limiting rod, and the threaded push rod is located above the transverse support platform.

[0017] Optionally, the two opposing L-shaped limiting rods are symmetrical, with the height of the front and rear L-shaped limiting rods being higher than that of the left and right L-shaped limiting rods; the two ends of the top limiting crossbar can be connected and fixed to the front and rear L-shaped limiting rods respectively with screws.

[0018] Compared with the prior art, this application has at least the following beneficial effects:

[0019] This application enables triaxial multidirectional efficient flexible sealing of reservoir rock mass, providing reliable sealing protection for multidirectional permeability testing and facilitating multidirectional high-pressure fluid flow testing of rock mass under three-dimensional geostress. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional diagram of the multi-directional seepage auxiliary sample loading and sealing device for deep reservoir rock mass in the embodiment;

[0022] Figure 2 This is a cross-sectional view of the multi-directional seepage auxiliary sample loading and sealing device for deep reservoir rock mass in the embodiment;

[0023] Figure 3 This is a three-dimensional view of the supporting and fixed base in the embodiment;

[0024] Figure 4 This is a 3D view of the limiting frame in the embodiment;

[0025] Figure 5 This is a three-dimensional view of the dispensing frame in the embodiment;

[0026] Figure 6 This is a three-dimensional diagram of the multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass in use, as shown in the embodiment.

[0027] Figure 7 This is a cross-sectional view of the multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass in use, as shown in the embodiment.

[0028] Figure 8 This is a schematic diagram of the self-supporting component in the embodiment;

[0029] Figure 9 This is a three-dimensional view of the flexible sealing frame in the embodiment;

[0030] Figure 10 This is a three-dimensional diagram of the six rectangular blocks assembled with the sample in the example. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0033] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] like Figure 1 , Figure 2 As shown in the figure, the deep reservoir rock mass multi-directional seepage auxiliary sample loading and sealing device disclosed in this embodiment includes a support base 61, a limiting frame 62 and an injection frame 63.

[0036] like Figure 3As shown, the support base 61 has a rectangular structure. The top surface of the support base 61 has a rectangular groove 611. The side length of the rectangular groove 611 is the same as the side length of the rectangular pressure block 4, which can be used to place the rectangular pressure block 4. The bottom of the rectangular groove 611 is provided with four sets of threaded through holes 614. The middle of the four sides of the bottom of the support base 61 is provided with a slot 612. The four sets of threaded through holes 614 are connected to one of the slots 612 respectively.

[0037] Four slots 612 are used to engage the four L-shaped limiting rods 621 of the limiting frame 62. The L-shaped limiting rods 621 can be fixed together with the support base 61 by installing screws at the threaded through holes 614.

[0038] The support base 61 has a raised support column 613 on each of the four sides of the top. The four support columns 613 are located on the outside of the four sides of the rectangular groove 611, and the support columns 613 are used to support the glue injection frame 63.

[0039] Optionally, the four support columns 613 are manufactured as a single unit with the support base 61.

[0040] In one possible design, the tops of two adjacent support columns 613 are L-shaped structures with a lower inner section and a higher outer section, which can be used to support the glue injection frame 63 and serve as a limit, while the tops of the other two support columns 613 are flat structures.

[0041] like Figure 4 As shown, the limiting frame 62 includes four L-shaped limiting rods 621 and a top limiting crossbar 622. The vertical portions of the four L-shaped limiting rods 621 have transverse support platforms 623 on their inner sides. The horizontal portions of the four L-shaped limiting rods 621 can be individually inserted into four slots 612 of the support base 61. The horizontal portions of the L-shaped limiting rods 621 have matching screw holes corresponding to the threaded through holes 614 of the support base 61. The tops of two opposing L-shaped limiting rods 621 have connecting holes for connection with the top limiting crossbar 622. The two ends of the top limiting crossbar 622 can be connected to these two L-shaped limiting rods 621 respectively using screws.

[0042] Optionally, the lateral support platform 623 and the corresponding L-shaped limiting rod 621 are manufactured as a single unit.

[0043] In one possible design, a threaded push rod 624 is mounted on a horizontal hole in the vertical part of the L-shaped limiting rod 621, and the threaded push rod 624 is located above the transverse support platform 623. When the rectangular pressure block 4 is placed on the transverse support platform 623, the threaded push rod 624 is directly opposite the center of the rectangular pressure block 4. The transverse position of the threaded push rod 624 can be adjusted by rotating it to fix the position of the rectangular pressure block 4.

[0044] Optionally, the two L-shaped limiting rods 621 are symmetrical, with the height of the front and rear L-shaped limiting rods 621 being higher than that of the left and right L-shaped limiting rods 621; the two ends of the top limiting crossbar 622 are respectively connected and fixed to the front and rear L-shaped limiting rods 621 with screws.

[0045] like Figure 5 As shown, the glue injection frame 63 is a cubic frame structure with 12 edges. The bottom and top of the glue injection frame 63 are provided with glue holes 634. The six hollow surfaces of the glue injection frame 63 allow six rectangular pressure blocks 4 to fit into it and form a seal with the periphery of the rectangular pressure blocks 4. When glue is injected from the glue holes 634, it can ensure that the high viscosity plastic silicone does not overflow from the seams and can make the corners of the cubic sample 3 bond and seal with the ends of the rectangular pressure blocks 4.

[0046] Optionally, the inner sides of the 12 edges of the injection frame 63 are arc-shaped groove structures 633, which can ensure uniform solidification of high-strength silicone injection.

[0047] To facilitate sample installation and removal, the glue injection frame 63 is designed to be detachable.

[0048] In one possible design, the glue injection frame 63 includes a bottom square frame 631, a top square frame 631, and four columns 632 in the middle, with the two square frames 631 and the four columns 632 connected by screws.

[0049] Each of the two square frames 631 has a glue hole 634 on one side. During sealing, silicone is injected from the glue hole 634 of the bottom square frame 631 by an air pressure pump under a certain pressure, filling the entire space between the cubic sample 3 and the edge of the glue injection frame 63, and overflowing from the glue hole 634 of the upper square frame 631; after the silicone in the glue injection frame 63 is completely solidified, a flexible sealing frame 5 with a certain bonding strength is formed.

[0050] like Figures 1-7 As shown, the method of using the multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock masses includes the following steps:

[0051] S1, Prepare cubic sample 3.

[0052] S2, insert the horizontal parts of the four L-shaped limiting rods 621 into the four slots 612 of the support base 61 and connect and fix them to the support base 61 with screws.

[0053] S3, place one of the rectangular pressure blocks 4 in the rectangular groove 611 of the support base 61.

[0054] S4, place the glue injection frame 63 on the four support columns 613 of the support base 61; it is worth noting that at this time, the horizontal support platform 623 is at the same height as the bottom of the glue injection frame 63.

[0055] S5, place the cubic sample 3 inside the glue injection frame 63 and place it on the rectangular pressure block 4 on the lower side, and adjust its position to be in the middle position.

[0056] S6, place the four rectangular pressure blocks 4 on the transverse support platform 623 of the four L-shaped limiting rods 621 respectively, so that the four rectangular pressure blocks 4 are directly facing the four faces of the cubic sample 3; rotate the threaded push rod 624, and the front end of the threaded push rod 624 pushes against the rectangular pressure block 4, so that the front end of the rectangular pressure block 4 is in close contact with the surface of the cubic sample 3.

[0057] S7, place the last rectangular pressure block 4 on the top surface of the cubic sample 3 through the hollow surface at the top of the glue injection frame 63.

[0058] S8, connect the two ends of the top limiting crossbar 622 to the top of two L-shaped limiting bars 621, and the top limiting crossbar 622 makes the upper rectangular pressure block 4 fit tightly against the top surface of the cubic sample 3.

[0059] S9. Connect the glue hole 634 at the bottom of the glue injection frame 63 to the outlet of the glue injection pump. Use the glue injection pump to slowly inject high-strength pressure-resistant silicone between the glue injection frame 63 and the cubic sample 3. Stop the glue injection after the glue hole 634 at the top of the glue injection frame 63 has been steadily overflowing. Remove the glue injection pump.

[0060] S10, using multiple self-supporting components 43 to connect 6 rectangular pressure blocks 4 together, and installing fluid pipes 42.

[0061] S11, wait until the silicone in the injection frame 63 has completely solidified and formed a certain bonding strength, thus forming the flexible sealing frame 5. Then, remove the top limiting crossbar 622 and the threaded top bar 624 in sequence. Next, disassemble the injection frame 63 and remove the cubic sample 3, the flexible sealing frame 5, the six rectangular pressure blocks 4, and the multiple self-supporting components 43 as a whole. Figure 10 As shown, for experimental purposes.

[0062] like Figure 7 , Figure 9 As shown, the final flexible sealing frame 5 is a cubic frame structure with 12 frame edges. The inner side of the frame edge naturally forms an angle structure that matches the corners of the cubic sample 3 and can be bonded to the sample to increase the sealing performance.

[0063] It is worth noting that the rectangular pressure block 4 has seepage channels, which is a conventional technology in this field and will not be described in detail here.

[0064] In one possible design, six rectangular blocks 4 are connected together using multiple self-supporting members 43. For example... Figure 8As shown, the self-supporting component 43 includes two guide rods and a guide sleeve 433. The two guide rods are a first guide rod 431 and a second guide rod 432. The first guide rod 431 and the second guide rod 432 are perpendicular to each other. The guide sleeve 433 has two guide holes that are adapted to the two guide rods respectively, and the two guide holes are perpendicular to each other. One end of the first guide rod 431 is connected to a rectangular pressure block 4, and the other end of the first guide rod 431 passes through one of the guide holes of the guide sleeve 433. One end of the second guide rod 432 is connected to another rectangular pressure block 4, and the other end of the second guide rod 432 passes through the other guide hole of the guide sleeve 433. The other ends of the two guide rods have annular grooves, and rubber retaining rings 435 are installed in the annular grooves. The rubber retaining rings 435 are located on the outside of the guide sleeve 433 to prevent the other ends of the two guide rods from coming out of the guide sleeve 433.

[0065] In each self-supporting member 43, one guide rod connected to the rectangular pressure block 4 is perpendicular to the axis of the rectangular pressure block 4, and the other guide rod is parallel to the axis of the rectangular pressure block 4. Through the combined action of multiple self-supporting members 43, the six rectangular pressure blocks 4 are assembled together, allowing them to move along their axis under external force and thus transmit pressure to the central sample, while preventing them from moving in directions other than their axis.

[0066] In one possible design, one pair of rectangular blocks 4 are connected to four other rectangular blocks 4 by one or two self-supporting members 43 on each of their four sides. Alternatively, each rectangular block 4 may be equipped with one or two self-supporting members 43 on each of its four sides, and the six rectangular blocks 4 can support each other through the self-supporting members 43.

[0067] Using this application, a cubic sample 3 can be bonded and fitted inside a flexible sealing frame 5. The six faces of the cubic sample 3 are in close contact with six rectangular pressure blocks 4, and the corners of the cubic sample 3 are bonded and sealed to the twelve edges of the flexible sealing frame 5. The four sides of the rectangular pressure blocks 4 are sealed to the edges of the flexible sealing frame 5, effectively preventing seepage media from flowing out from the edges of the cubic sample 3. Simultaneously, the six assembled rectangular pressure blocks 4 are arranged in six directions, one pair each along the X, Y, and Z axes, facilitating docking with a triaxial six-axis loading system.

[0068] This application enables triaxial multidirectional high-efficiency flexible sealing of reservoir rock mass, providing reliable sealing guarantee for multidirectional permeability testing, facilitating multidirectional high-pressure fluid flow testing of rock mass under three-dimensional geostress, and providing technical support for improving resource development efficiency, reducing costs, and achieving sustainable energy development.

[0069] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sealing device for multi-directional seepage assistance in deep reservoir rock mass, characterized in that, include: The support base (61) has a rectangular groove (611) on its top surface, which is used to place the rectangular pressure block (4) at the bottom. The bottom of the rectangular groove (611) is provided with four sets of threaded through holes (614). The support base (61) has a slot (612) in each of the four directions at the bottom. The four sets of threaded through holes (614) are connected to one of the slots (612). The top of the support base (61) has four support columns (613), which are located on the outside of the four sides of the rectangular groove (611). The support columns (613) are used to support the glue injection frame (63). The limiting frame (62) includes a top limiting crossbar (622) and four L-shaped limiting rods (621). The vertical part of the four L-shaped limiting rods (621) has a horizontal support platform (623) on its inner side. The horizontal support platform (623) is used to support four rectangular pressure blocks (4) on the side. The horizontal part of the four L-shaped limiting rods (621) can be inserted into the four slots (612) of the support base (61). The horizontal part of the L-shaped limiting rods (621) has a matching screw hole corresponding to the position of the threaded through hole (614). The two ends of the top limiting crossbar (622) are connected to the top of two opposite L-shaped limiting rods (621) with screws respectively. The top limiting crossbar (622) is used to press down on the rectangular pressure block (4) on the top from top to bottom. The glue injection frame (63) is a cubic frame structure for placing the cubic sample (3). The glue injection frame (63) has 12 edges. The bottom and top of the glue injection frame (63) are provided with glue holes (634). The six hollow surfaces of the glue injection frame (63) allow six rectangular pressure blocks (4) to fit into each other and form a seal with the periphery of the rectangular pressure blocks (4).

2. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 1, characterized in that, The support base (61) is a rectangular structure, with four support columns (613) located on the four sides of the top of the support base (61); and four slots (612) located at the middle of the four sides of the support base.

3. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 1, characterized in that, The glue injection frame (63) is designed to be detachable.

4. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 3, characterized in that, The glue injection frame (63) includes a bottom square frame (631), a top square frame (631), and four columns (632) in the middle. The two square frames (631) and the four columns (632) are connected by screws. Each of the two square frames (631) has a glue hole (634) on one side.

5. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to any one of claims 1-4, characterized in that, The inner sides of the 12 edges of the glue injection frame (63) are arc-shaped groove structures (633).

6. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 1, characterized in that, The tops of the two adjacent support columns (613) are L-shaped structures with a lower inner side and a higher outer side, which are used to support the glue injection frame (63) and serve as a limit. The tops of the other two support columns (613) are flat structures.

7. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 1, characterized in that, The vertical part of the L-shaped limiting rod (621) has a horizontal hole for mounting a threaded push rod (624), which is located above the transverse support platform (623).

8. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 1, characterized in that, The two L-shaped limiting rods (621) are symmetrical in structure. The height of the front and rear L-shaped limiting rods (621) is higher than that of the left and right L-shaped limiting rods (621). The two ends of the top limiting crossbar (622) are connected and fixed to the front and rear L-shaped limiting rods (621) respectively with screws.

9. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 1, characterized in that, The transverse support platform (623) and the corresponding L-shaped limit rod (621) are manufactured as a single unit.

10. The multi-directional seepage auxiliary sampling and sealing device for deep reservoir rock mass according to claim 1, characterized in that, The four support columns (613) are manufactured as a single unit with the support base (61).

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