Multi-directional seepage sealing method under three-dimensional stress of reservoir rock mass

Abstract

The application provides a multi-directional seepage sealing method for a reservoir rock mass under three-dimensional stress, and comprises the following steps: S1, a cubic sample is placed in a glue injection frame, and the front ends of six rectangular pressing blocks are respectively attached to the six hollow surfaces of the glue injection frame to tightly contact the six surfaces of the cubic sample; S2, sealing glue is slowly injected into the space between the edges of the glue injection frame and the edges of the cubic sample by using a glue injection pump; the six rectangular pressing blocks are connected together; and waiting until the sealing glue in the glue injection frame completely solidifies and forms a flexible sealing frame with certain bonding strength; S3, the glue injection frame is disassembled to obtain an overall structure composed of the six rectangular pressing blocks, the cubic sample and the flexible sealing frame. In the application, the space between the edges of the glue injection frame and the edges of the cubic sample is filled with sealing glue, the solidified sealing glue can seal the edge parts of the cubic sample, the sealing of the periphery of the rectangular pressing blocks can be realized, and the periphery of the sample can be ensured to be in a sealed environment and multi-directional fluid flow can be realized during seepage testing.

Description

Technical Field

[0001] This invention relates to the fields of rock mechanics and engineering technology, and in particular to a method for sealing multi-directional seepage under three-dimensional stress in 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 cost.

[0003] In deep reservoir permeability studies, 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. It cannot realistically simulate the high-stress, multi-directional flow conditions in three-dimensional underground environments, leading to significant discrepancies between experimental results and actual conditions.

[0004] The newly developed reservoir three-dimensional stress-based multi-directional permeability testing technology can more accurately assess the permeability of deep reservoirs by simulating real underground conditions, providing more accurate data support for resource exploration and development. However, the reservoir three-dimensional stress-based multi-directional permeability testing requires the injection of high-pressure fluid from different stress directions, which necessitates ensuring that the sample is surrounded by a sealed environment while allowing for multi-directional fluid flow. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for multi-directional seepage sealing under three-dimensional stress in reservoir rock masses.

[0006] This invention is achieved through the following technical solution:

[0007] The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass provided in this application includes the following steps:

[0008] S1, the cube sample is placed inside the cube-structured glue injection frame. The front ends of the 6 rectangular pressure blocks respectively enter the interior of the 6 hollowed-out surfaces of the glue injection frame and make close contact with the 6 surfaces of the cube sample. The glue injection frame and the periphery of the rectangular pressure blocks form a seal, so that the cube sample does not contact the glue injection frame and is located in the center of the glue injection frame. The glue injection frame as a whole is a detachable design.

[0009] S2, Use a dispensing pump to slowly fill the entire space between the edges of the dispensing frame and the edges of the cubic sample with sealant;

[0010] Connect the 6 rectangular blocks together;

[0011] Wait until the sealant in the injection frame is completely cured and forms a flexible sealing frame with a certain bonding strength. At this time, the cube sample is bonded and fitted inside the flexible sealing frame. The six faces of the cube sample are in close contact with the six rectangular pressure blocks. The corners of the cube sample are bonded and sealed with the twelve edges of the flexible sealing frame. The four sides of the rectangular pressure blocks are sealed with the edges of the flexible sealing frame.

[0012] S3, disassemble the glue injection frame to separate the glue injection frame from the 6 rectangular pressure blocks, cubic specimens and flexible sealing frame, and obtain the overall structure composed of the 6 rectangular pressure blocks, cubic specimens and flexible sealing frame.

[0013] It is worth noting that the material of the injected sealant can be reasonably selected according to needs, as long as it can solidify from a gel state to a solid state and withstand a certain amount of deformation. Examples include high-strength pressure-resistant silicone and silicone grease adhesive. Optionally, the inner sides of the 12 edges of the injection frame can be designed with arc-shaped grooves.

[0014] Optionally, before applying the adhesive, apply a layer of anti-stick oil film to the arc-shaped groove structure inside the 12 edges of the adhesive application frame.

[0015] Optionally, the glue injection frame includes a bottom square frame, a top square frame, and four columns in the middle. The two square frames and the four columns are connected by screws, and each of the two square frames has a glue hole on one side. In step S2, the sealant is injected from the glue hole of the bottom square frame by a glue injection pump under certain pressure, filling the entire space between the cubic sample and the edge of the glue injection frame, and overflowing from the glue hole of the top square frame.

[0016] Optionally, a sample loading auxiliary device is adopted, which includes four L-shaped limiting rods, a support base, and a top limiting crossbar. The support base has a slot at the middle of each of the four sides at the bottom, and four support columns at the top, which are located on the outer sides of the four sides of the rectangular groove. The vertical part of the L-shaped limiting rod has a horizontal support platform on its inner side, and a threaded top rod is installed in a horizontal hole on the vertical part of the L-shaped limiting rod. The threaded top rod is located above the horizontal support platform.

[0017] S1 includes the following steps:

[0018] Insert the horizontal parts of the four L-shaped limiting rods into the four slots at the bottom of the support base and fix them to the support base with screws;

[0019] Place the rectangular pressure block at the bottom into the rectangular groove on the top surface of the support base;

[0020] The square frame at the bottom of the glue injection frame is connected and fixed to the bottom of the four columns with screws; then it is placed on the four support columns of the support base, so that the front end of the rectangular pressure block at the bottom fits into the hollow surface of the bottom square frame and forms a seal with the perimeter of the square frame.

[0021] Place the cubic sample inside the dispensing frame and on the rectangular pressure block at the bottom, and adjust its position to be in the middle.

[0022] The square frame at the top of the glue injection frame is connected and fixed to the top of the four columns with screws;

[0023] Place the four rectangular pressure blocks on the horizontal support platform of the four L-shaped limiting rods, so that the four rectangular pressure blocks are directly facing the four faces of the cubic sample; rotate the threaded top rod, and the front end of the threaded top rod presses against the rectangular pressure block, so that the front end of the rectangular pressure block fits between the four columns and into the four sides of the cubic sample.

[0024] Place the top rectangular pressure block on the top surface of the cube sample through the cutout surface of the top square frame; then connect the two ends of the top limiting crossbar to the top of the two opposite L-shaped limiting bars, so that the top limiting crossbar makes the top rectangular pressure block fit tightly against the top surface of the cube sample.

[0025] In S3, remove the top limiting crossbar and threaded top bar in sequence; then remove the screws of the glue injection frame, slowly remove the L-shaped limiting bar, and take out the cubic sample, flexible sealing frame and 6 rectangular pressure blocks as a whole.

[0026] Optionally, the bottom of the rectangular groove is provided with four sets of threaded through holes, each of which communicates with one of the slots; the horizontal part of the L-shaped limiting rod has a matching screw hole corresponding to the position of the threaded through hole.

[0027] Optionally, the tops of two adjacent support columns are L-shaped structures with a lower inner side and a higher outer side, while the tops of the other two support columns are flat structures; when placing the glue injection frame, the two sides of the glue injection frame are respectively attached to the vertical parts of the L-shaped structures of the two support columns.

[0028] 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.

[0029] Optionally, in S2, high-strength pressure-resistant silicone is slowly injected into the glue holes of the glue box at a pressure of 0.2 MPa using a glue pump.

[0030] Optionally, in S2, six rectangular pressure blocks are connected together using multiple self-supporting components. Each self-supporting component includes two guide rods and a guide sleeve. The two guide rods are perpendicular to each other, and the guide sleeve has two guide holes that are respectively adapted to the two guide rods and are perpendicular to each other. One end of one guide rod is connected to a rectangular pressure block, and its other end passes through one of the guide holes in the guide sleeve. One end of the other guide rod is connected to another rectangular pressure block, and its other end passes through the other guide hole in the guide sleeve. The other ends of both guide rods have annular grooves, in which rubber retaining rings are installed. The rubber retaining rings are located outside the guide sleeve to prevent the other ends of the two guide rods from detaching from the guide sleeve.

[0031] In each self-supporting component, one of the guide rods connected to the rectangular pressure block is perpendicular to the axis of the rectangular pressure block, and the other guide rod is parallel to the axis of the rectangular pressure block.

[0032] Compared with the prior art, this application has at least the following beneficial effects:

[0033] This application fills the entire space between the edges of the rubber frame and the edges of the cubic sample with sealant. The solidified sealant can seal the corners of the cubic sample and the perimeter of the rectangular block. During seepage testing, it can ensure that the sample is in a sealed environment and allow for multi-directional fluid flow. This provides a more comprehensive understanding of the permeability distribution and evolution of the reservoir, and helps to provide a more reliable basis for the formulation of mining plans. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a cross-sectional view of the reservoir rock mass under three-dimensional stress and multi-directional seepage sealing in the embodiment.

[0036] Figure 2 This is a three-dimensional view of the dispensing frame in the embodiment;

[0037] Figure 3 This is a three-dimensional view of the flexible sealing frame in the embodiment;

[0038] Figure 4 This is a 3D view of the sample sealing process using the sample loading auxiliary device in the embodiment.

[0039] Figure 5 This is a cross-sectional view of the sample being sealed during the sample loading process using a sample loading auxiliary device, as shown in the embodiment.

[0040] Figure 6 This is a three-dimensional diagram of the sample loading auxiliary device in the embodiment;

[0041] Figure 7 This is a cross-sectional view of the sample loading auxiliary device in the embodiment;

[0042] Figure 8 This is a three-dimensional view of the supporting and fixed base in the embodiment;

[0043] Figure 9 This is a three-dimensional view of the four L-shaped limiting rods and the top limiting crossbar in the embodiment;

[0044] Figure 10 This is a schematic diagram of the self-supporting component in the embodiment;

[0045] Figure 11 This is a three-dimensional diagram of the six rectangular pressure blocks and the sample being sealed and assembled together in the example. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] like Figure 1 , Figure 2 As shown in this embodiment, the multi-directional seepage sealing method for reservoir rock under three-dimensional stress includes the following steps:

[0051] S1, the cube sample 3 is placed inside the cube-structured glue injection frame 63. The front ends of the six rectangular pressure blocks 4 respectively enter the interior of the glue injection frame 63 from the six hollowed-out surfaces and make close contact with the six surfaces of the cube sample 3. The glue injection frame 63 and the rectangular pressure blocks 4 form a seal around their perimeter. The cube sample 3 does not contact the glue injection frame 63 and is located in the center of the glue injection frame 63. The glue injection frame 63 as a whole is designed to be detachable.

[0052] S2, connect the glue hole 634 at the bottom of the glue injection frame 63 to the outlet of the glue injection pump, and slowly inject the sealant into the entire space between the edge of the glue injection frame 63 and the edge of the cubic sample 3 using the glue injection pump. 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.

[0053] Connect the six rectangular blocks together;

[0054] Wait until the sealant inside the injection frame 63 has completely solidified and formed a flexible sealing frame 5 with a certain bonding strength, such as... Figure 3 As shown;

[0055] S3, disassemble the glue injection frame 63 to separate the glue injection frame 63 from the 6 rectangular pressure blocks 4 and the cubic sample 3. At this time, the cubic sample 3 is glued and fitted inside the flexible sealing frame 5. The 6 faces of the cubic sample 3 are in close contact with the 6 rectangular pressure blocks 4 respectively. The corners of the cubic sample 3 are glued and sealed with the 12 frame edges of the flexible sealing frame 5. The four sides of the rectangular pressure blocks 4 are sealed with the frame edges of the flexible sealing frame 5, which can effectively prevent the seepage medium from flowing out from the edges of the cubic sample 3 and the rectangular pressure blocks 4.

[0056] It is worth noting that the rectangular pressure block 4 has seepage channels and is equipped with fluid pipes 42, which is a conventional technology in this field and will not be described in detail here.

[0057] It is worth noting that the material of the injected sealant can be reasonably selected according to the needs, as long as it can solidify from a gel to a solid glue and can withstand a certain amount of deformation. For example, high-strength pressure-resistant silicone, silicone grease adhesive, etc.

[0058] In one possible design, cubic specimen 3 is a 100mm*100mm*100mm chamfered cubic reservoir rock specimen.

[0059] Optionally, the inner sides of the 12 edges of the glue injection frame 63 are arc-shaped groove structures 633, which can ensure that the sealant is injected and solidified evenly.

[0060] In one possible design, the glue injection frame 63 includes a bottom square frame 631, a top square frame 631, and four central pillars 632. The two square frames 631 and the four pillars 632 are connected by screws. Each of the two square frames 631 has a glue hole 634 on one side. In step S2, sealant is injected under pressure from the glue hole 634 in the bottom square frame 631 by a glue injection pump, filling the entire space between the cubic sample 3 and the edges of the glue injection frame 63, and overflowing from the glue hole 634 in the top square frame 631.

[0061] In one possible design, the method employs a sample loading auxiliary device, which includes four L-shaped limiting rods 621, a support base 61, and a top limiting crossbar 622. For example... Figure 8 As shown, the support base 61 has a rectangular structure. The top surface of the support base 61 has a rectangular groove 611 of a certain depth. 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.

[0062] 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.

[0063] 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.

[0064] like Figure 9As shown, the vertical sections of the four L-shaped limiting rods 621 have transverse support platforms 623 on their inner sides. The horizontal sections of the four L-shaped limiting rods 621 can be inserted into the four slots 612 of the support base 61. The horizontal sections 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 connecting 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 with screws.

[0065] 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.

[0066] In one possible design, the tops of the two support columns 613 on the left and rear sides are L-shaped structures with a lower inner side and a higher outer side, which can be 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.

[0067] 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.

[0068] like Figures 4-7 As shown, step S1 includes the following steps:

[0069] S1.1, the horizontal parts of the four L-shaped limiting rods 621 are inserted one by one into the four slots 612 at the bottom of the support base 61 and connected and fixed to the support base 61 with screws.

[0070] S1.2, place the rectangular pressure block 4 at the bottom into the rectangular groove 611 of the support base 61.

[0071] S1.3, apply a layer of anti-stick oil film to the arc-shaped groove structure 633 inside the 12 edges of the glue injection frame 63;

[0072] Then, the bottom square frame 631 is connected and fixed to the bottom of the four columns 632 with four screws; then it is placed on the four support columns 613 of the support base 61, and the left and back sides of the glue injection frame 63 are respectively attached to the vertical part of the L-shaped structure of the support column 613 on the left and back of the support base, so as to define the position of the glue injection frame 63; at this time, the front end of the bottom rectangular pressure block 4 fits into the hollow surface of the bottom square frame 631 and forms a seal with the periphery of the square frame 631;

[0073] S1.4 Place the cubic sample 3 inside the glue injection frame 63 and on the rectangular pressure block 4 at the bottom, and adjust its position to be in the middle position;

[0074] S1.5, connect and fix the top square frame 631 to the top of the four columns 632 with four screws;

[0075] S1.6, 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 top rod 624, and the front end of the threaded top rod 624 presses against the rectangular pressure block 4, so that the front end of the rectangular pressure block 4 fits between the four columns 632 and into the four sides of the cubic sample 3 tightly;

[0076] It is worth noting that the four rectangular pressure blocks 4 are installed in pairs. For example, the rectangular pressure blocks 4 on the left and right sides can be installed and fixed first, and then the rectangular pressure blocks 4 on the front and back sides can be installed in sequence.

[0077] S1.7, the top rectangular pressure block 4 is placed on the top surface of the cubic sample 3 through the hollow surface of the top square frame 631; then, the two ends of the top limiting crossbar 622 are connected to the top of the two opposite L-shaped limiting bars 621, and the top limiting crossbar 622 makes the top rectangular pressure block 4 fit tightly against the top surface of the cubic sample 3.

[0078] In one possible design, in S2, high-strength pressure-resistant silicone is slowly injected into the glue hole 634 of the glue injection frame 63 at a pressure of 0.2 MPa using a glue injection pump.

[0079] In one possible design, in S2, six rectangular blocks 4 are connected together using multiple self-supporting members 43. For example... Figure 10 As shown, six rectangular blocks 4 are connected together using multiple self-supporting components 43. Figure 8 As 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 first guide rod 431 and the second guide rod 432 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 first guide rod 431 and the second guide rod 432 have annular grooves, in which rubber retaining rings 435 are installed. The rubber retaining rings 435 are located on the outside of the guide sleeve 433 to prevent the other ends of the first guide rod 431 and the second guide rod 432 from coming out of the guide sleeve 433.

[0080] 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.

[0081] In one possible design, one pair of rectangular blocks 4 are connected to the other four rectangular blocks 4 by one or two self-supporting members 43 on each of their four sides; or, each rectangular block 4 is 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 multiple self-supporting members 43.

[0082] In S3, the top limiting crossbar 622 and threaded top bar 624 are removed sequentially; then, the eight screws of the glue injection frame 63 are removed, and the L-shaped limiting bar 621 is slowly removed. The cubic sample 3, flexible sealing frame 5, six rectangular pressure blocks 4, and multiple self-supporting components 43 are then removed as a whole for testing. The six rectangular pressure blocks 4 assembled together are arranged in pairs along the six directions, specifically the X, Y, and Z axes. Figure 11 As shown.

[0083] This application fills the entire space between the edges of the rubber frame and the edges of the cubic sample with sealant. The solidified sealant can seal the corners of the cubic sample and the perimeter of the rectangular block. During seepage testing, it can ensure that the sample is in a sealed environment and allow for multi-directional fluid flow. This provides a more comprehensive understanding of the permeability distribution and evolution of the reservoir, and helps to provide a more reliable basis for the formulation of mining plans.

[0084] 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 method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass, characterized in that, Includes the following steps: S1, the cube sample (3) is placed inside the cube-structured glue injection frame (63). The front ends of the six rectangular pressure blocks (4) are respectively inserted into the interior of the six hollowed-out surfaces of the glue injection frame (63) and in close contact with the six surfaces of the cube sample (3). The glue injection frame (63) and the rectangular pressure blocks (4) form a seal around the perimeter, so that the cube sample (3) does not contact the glue injection frame (63) and is located in the center of the glue injection frame (63). The glue injection frame (63) is designed to be detachable. S2, use a dispensing pump to slowly fill the entire space between the edges of the dispensing frame (63) and the edges of the cubic sample (3) with sealant; Connect the six rectangular blocks (4) together; Wait until the sealant in the injection frame (63) is completely solidified and forms a flexible sealing frame (5) with a certain bonding strength. At this time, the cube sample (3) is bonded and fitted inside the flexible sealing frame (5). The six faces of the cube sample (3) are in close contact with the six rectangular pressure blocks (4). The corners of the cube sample (3) are bonded and sealed with the twelve edges of the flexible sealing frame (5). The four sides of the rectangular pressure blocks (4) are sealed with the edges of the flexible sealing frame (5). S3, disassemble the glue injection frame (63) to separate the glue injection frame (63) from the 6 rectangular pressure blocks (4), the cubic sample (3) and the flexible sealing frame (5) to obtain the overall structure composed of the 6 rectangular pressure blocks (4), the cubic sample (3) and the flexible sealing frame (5).

2. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to claim 1, characterized in that, The inner sides of the 12 edges of the glue injection frame (63) are arc-shaped groove structures (633).

3. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to claim 2, characterized in that, Before applying the adhesive, apply a layer of anti-sticking oil film to the arc-shaped groove structure (633) inside the 12 edges of the adhesive application frame (63).

4. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to claim 1, 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. One side of the square frame (631) is provided with a glue hole (634). In step S2, the sealant is injected by a glue pump through the glue hole (634) of the bottom square frame (631) 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).

5. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to any one of claims 1-4, characterized in that, A sample loading auxiliary device is adopted, which includes four L-shaped limiting rods (621), a support base (61) and a top limiting crossbar (622). A slot (612) is provided at the middle of the four sides of the bottom of the support base (61), and there are four support columns (613) at the top of the support base (61). The four support columns (613) are respectively on the outside of the four sides of the rectangular groove (611). The vertical part of the L-shaped limiting rod (621) has a horizontal support platform (623) on its inner side. A horizontal hole is opened on the vertical part of the L-shaped limiting rod (621) and a threaded top rod (624) is installed. The threaded top rod (624) is located above the horizontal support platform (623). Step S1 includes the following steps: The horizontal parts of the four L-shaped limiting rods (621) are inserted one by one into the four slots (612) at the bottom of the support base (61) and connected and fixed to the support base (61) with screws; Place the rectangular pressure block (4) at the bottom into the rectangular groove (611) on the top surface of the support base (61); The square frame (631) at the bottom of the glue injection frame (63) is connected and fixed to the bottom of the four columns (632) with screws; then it is placed on the four support columns (613) of the support base (61), so that the front end of the rectangular pressure block (4) at the bottom fits into the hollow surface of the bottom square frame (631) and forms a seal with the periphery of the square frame (631); Place the cubic sample (3) inside the glue injection frame (63) and on the rectangular pressure block (4) at the bottom, and adjust its position to be in the middle position; The square frame (631) at the top of the glue injection frame (63) is connected and fixed to the top of the four columns (632) with screws; Place the four rectangular pressure blocks (4) on the transverse support platform (623) of the four L-shaped limiting rods (621), so that the four rectangular pressure blocks (4) are respectively facing the four faces of the cubic sample (3); rotate the threaded top rod (624), and the front end of the threaded top rod (624) presses against the rectangular pressure block (4), so that the front end of the rectangular pressure block (4) fits between the four columns (632) and fits tightly against the four sides of the cubic sample (3); The top rectangular pressure block (4) is placed on the top surface of the cube sample (3) through the hollow surface of the top square frame (631); then, the two ends of the top limiting crossbar (622) are connected to the top of the two opposite L-shaped limiting bars (621), and the top limiting crossbar (622) makes the top rectangular pressure block (4) fit tightly against the top surface of the cube sample (3). In step S3, the top limiting crossbar (622) and threaded top bar (624) are removed in sequence; then the screws of the glue injection frame (63) are removed, the L-shaped limiting bar (621) is slowly removed, and the cubic sample (3), flexible sealing frame (5) and 6 rectangular pressure blocks (4) are taken out as a whole.

6. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to claim 5, characterized in that, The bottom of the rectangular groove (611) is provided with four sets of threaded through holes (614), and the four sets of threaded through holes (614) are respectively connected to one of the slots (612); the horizontal part of the L-shaped limiting rod (621) has a matching screw hole corresponding to the position of the threaded through hole (614).

7. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to claim 5, characterized in that, The tops of the two adjacent support columns (613) are L-shaped structures with the inner side lower than the outer side, while the tops of the other two support columns (613) are flat structures. When placing the glue injection frame (63), the two sides of the glue injection frame (63) are respectively attached to the vertical parts of the L-shaped structures of the two support columns (613).

8. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to claim 5, 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) can be connected and fixed to the front and rear L-shaped limiting rods (621) respectively with screws.

9. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to claim 1, characterized in that, In step S2, high-strength pressure-resistant silicone is slowly injected into the glue hole (634) of the glue injection frame (63) at a pressure of 0.2MPa using a glue injection pump.

10. The method for sealing multi-directional seepage under three-dimensional stress in reservoir rock mass according to any one of claims 1-4 and 6-9, characterized in that, In step S2, six rectangular blocks (4) are connected together using multiple self-supporting components (43). The self-supporting component (43) includes two guide rods and a guide sleeve (433). The two guide rods are perpendicular to each other, and the guide sleeve (433) has two guide holes that are adapted to the two guide rods respectively. The two guide holes are perpendicular to each other. One end of one guide rod is connected to the rectangular block (4), and its other end passes through one of the guide holes of the guide sleeve (433). One end of the other guide rod is connected to another rectangular block (4), and its other end 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 outside the guide sleeve (433) to prevent the other ends of the two guide rods from coming out of the guide sleeve (433). In each self-supporting member (43), one of the guide rods 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).

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