A multi-pressure system simulator and operation method

Abstract

The present invention discloses a multi-pressure system simulator, which includes a main cavity and a cover plate. The cover plate is movably connected to the top of the main cavity. The main cavity is provided with a first pressure system, a second pressure system, a third pressure system and a fourth pressure system. The first pressure system, the second pressure system, the third pressure system and the fourth pressure system respectively include a first forming die, a second forming die, a third forming die and a fourth forming die. Laying channels corresponding to the first forming die, the second forming die, the third forming die and the fourth forming die are arranged inside the main cavity. The pressure system of the present invention can maximize the restoration of the accumulation characteristics of the multi-pressure system, can not only ensure the sealing between the pressure systems, but also realize the stress transfer between the coal reservoir and the surrounding rock interlayer, and has practical guiding significance for improving the real restoration of the development of the multi-pressure system and efficiently developing unconventional natural gas.

Description

Technical Field

[0001] The present invention relates to the technical field of unconventional natural gas development, and particularly relates to a multi-pressure system simulator and an operation method thereof. Background Art

[0002] In areas with complex coalbed methane geological conditions, the most significant feature is the frequent vertical alternation of different lithologies, and there are often two or more gas-bearing systems with independent reservoir pressure systems vertically developed (abbreviation: multi-pressure system). For the accumulation characteristics of the multi-pressure system, the development mode of "one well producing multiple layers" is commonly used. Engineering practice shows that in the process of multi-pressure system development, there are often problems such as obvious differences in compatibility between different systems, prominent contradictions between systems, unsatisfactory gas production, and increased difficulty in implementing development technologies.

[0003] At present, most of the multi-pressure system simulators at home and abroad can only simulate one pressure system or two pressure systems. At the same time, the forming process of multi-pressure simulation is relatively rough, and the forming method is not optimized, resulting in a relatively small sealing pressure between different pressure systems. Summary of the Invention

[0004] 1. Technical Problems to be Solved

[0005] The purpose of the present invention is to solve the problem that most of the existing multi-pressure system simulators can only simulate one pressure system or two pressure systems, and at the same time, the forming process of multi-pressure simulation is relatively rough and the forming method is not optimized, and to propose a multi-pressure system simulator and an operation method thereof.

[0006] 2. Technical Solutions

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A multi-pressure system simulator includes a main cavity and a cover plate. The cover plate is movably connected to the top of the main cavity. The main cavity is provided with a first pressure system, a second pressure system, a third pressure system, and a fourth pressure system. The first pressure system, the second pressure system, the third pressure system, and the fourth pressure system respectively include a first forming die, a second forming die, a third forming die, and a fourth forming die. A laying channel corresponding to the first forming die, the second forming die, the third forming die, and the fourth forming die is provided inside the main cavity;

[0009] A first cavity, a second cavity, a third cavity, and a fourth cavity are sequentially arranged inside the first forming die, the second forming die, the third forming die, and the fourth forming die. Lining plates are provided at the inner bottoms of the first cavity, the second cavity, the third cavity, and the fourth cavity;

[0010] At the top of the adjacent sides of the first forming die, the second forming die, the third forming die and the fourth forming die, there are connecting blocks fixedly connected, and between two adjacent connecting blocks, there are fixedly connected by pressure relief bolts.

[0011] Preferably, a plurality of fixing grooves are provided at the bottom of the main cavity.

[0012] Preferably, one end of the main cavity close to the first forming die is fixedly connected with a support rod, and between the first forming die and the support rod, there are fixedly connected by a plurality of fastening bolts.

[0013] Preferably, at the top of the first forming die and the fourth forming die, there are support blocks fixedly connected, and the edges of the support blocks are in contact with the inner wall of the main cavity.

[0014] Preferably, the material of the backing plate is a metal foam board.

[0015] In the present invention, an operation method of a multi-pressure system simulator is also proposed, including the following steps:

[0016] Step 1: Lay the first pressure system, fill the prepared pulverized coal similar material into the first cavity, then fill the surrounding rock interlayer similar material into the corresponding laying channel, then forcefully strike the pulverized coal similar material and the surrounding rock interlayer similar material, then unscrew the pressure relief bolt corresponding to the first cavity, and finally take out the first forming die corresponding to the first cavity;

[0017] Step 2: Lay the second pressure system, fill the prepared pulverized coal similar material into the second cavity, then fill the surrounding rock interlayer similar material into the corresponding laying channel, then forcefully strike the pulverized coal similar material and the surrounding rock interlayer similar material, then unscrew the pressure relief bolt corresponding to the second cavity, and finally take out the second forming die corresponding to the second cavity;

[0018] Step 3: Lay the third pressure system, fill the prepared pulverized coal similar material into the third cavity, then fill the surrounding rock interlayer similar material into the corresponding laying channel, then forcefully strike the pulverized coal similar material and the surrounding rock interlayer similar material, then unscrew the pressure relief bolt corresponding to the third cavity, and finally take out the third forming die corresponding to the third cavity;

[0019] Step 4: Lay the fourth pressure system, fill the prepared pulverized coal similar material into the fourth cavity, then fill the surrounding rock interlayer similar material into the corresponding laying channel, then forcefully strike the pulverized coal similar material and the surrounding rock interlayer similar material, then immediately unscrew the pressure relief bolt corresponding to the fourth cavity, and finally take out the fourth forming die corresponding to the fourth cavity; After the above steps, the laying preparation work of the multi-pressure system can be completed, and finally, it can be pressed and formed by a press.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] (1) In the present invention, each forming die is designed with a pressure relief bolt, so that the previously formed pressure system can remove the forming die under the condition of relieving pressure on the distal pressure relief bolt, and at the same time, it ensures that the pulverized coal and the surrounding rock interlayer similar material are fixed at the preset spatial position, which also optimizes the sealing effect between different pressure systems, and the maximum sealing pressure between systems can reach 1.8 MPa.

[0023] (2) In the present invention, the pressure system can maximize the restoration of the multi-pressure system reservoir formation characteristics, can not only ensure the sealing between pressure systems, but also realize the stress transfer between the coal reservoir and the surrounding rock interlayer, which has practical guiding significance for improving the true restoration of multi-pressure system development and efficiently developing unconventional natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the formal structural schematic diagram of a multi-pressure system simulator proposed by the present invention;

[0025] Figure 2 is the top view structural schematic diagram of the main cavity of a multi-pressure system simulator proposed by the present invention;

[0026] Figure 3 is the front view structural schematic diagram of the forming die in a multi-pressure system simulator proposed by the present invention.

[0027] In the figure: 1 main cavity, 2 cover plate, 3 first forming die, 4 second forming die, 5 third forming die, 6 fourth forming die, 7 first cavity, 8 second cavity, 9 third cavity, 10 fourth cavity, 11 backing plate, 12 connecting block, 13 pressure relief bolt, 14 fixing hole, 15 support rod, 16 fastening bolt, 17 support block, 18 laying channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] Embodiment 1:

[0030] Referring to Figures 1-3 , a multi-pressure system simulator includes a main cavity 1 and a cover plate 2. A plurality of fixing grooves are provided at the bottom of the main cavity 1, the cover plate 2 is movably connected to the top of the main cavity 1, and a first pressure system, a second pressure system, a third pressure system and a fourth pressure system are provided in the main cavity 1;

[0031] In the present invention, the first pressure system, the second pressure system, the third pressure system, and the fourth pressure system respectively include a first forming die 3, a second forming die 4, a third forming die 5, and a fourth forming die 6. One end of the main cavity 1 close to the first forming die 3 is fixedly connected with a support rod 15 for supporting and fixing the first forming die 3. The first forming die 3 and the support rod 15 are fixedly connected by a plurality of fastening bolts 16.

[0032] In the present invention, support blocks 17 are fixedly connected to the tops of both the first forming die 3 and the fourth forming die 6. The edges of the support blocks 17 are in contact with the inner wall of the main cavity 1 for supporting the forming dies. Laying channels 18 corresponding to the first forming die 3, the second forming die 4, the third forming die 5, and the fourth forming die 6 are provided inside the main cavity 1 for laying surrounding rock interlayer similar materials.

[0033] In the present invention, a first cavity 7, a second cavity 8, a third cavity 9, and a fourth cavity 10 are sequentially arranged inside the first forming die 3, the second forming die 4, the third forming die 5, and the fourth forming die 6 for filling coal powder similar materials. Metal foam plates are provided at the inner bottoms of the first cavity 7, the second cavity 8, the third cavity 9, and the fourth cavity 10, which play a role in supporting and buffering.

[0034] In the present invention, connection blocks 12 are fixedly connected to the tops of adjacent sides of the first forming die 3, the second forming die 4, the third forming die 5, and the fourth forming die 6. Adjacent connection blocks 12 are fixedly connected by pressure relief bolts 13. Under the condition of relieving pressure on the distal pressure relief bolts 13, the forming dies can be taken out.

[0035] In the present invention, an operation method of a multi-pressure system simulator includes the following steps:

[0036] Step 1: Lay the first pressure system. Fill the first cavity 7 with the coal powder similar material prepared in advance, then fill the corresponding laying channel 18 with the surrounding rock interlayer similar material, then strike the coal powder similar material and the surrounding rock interlayer similar material forcefully, then unscrew the pressure relief bolt 13 corresponding to the fourth cavity 10, then unscrew the pressure relief bolt 13 corresponding to the first cavity 7, and finally take out the first forming die 3 corresponding to the first cavity 7.

[0037] Step 2: Lay the second pressure system. Fill the second cavity 8 with the coal powder similar material prepared in advance, then fill the corresponding laying channel 18 with the surrounding rock interlayer similar material, then strike the coal powder similar material and the surrounding rock interlayer similar material forcefully, then unscrew the pressure relief bolt 13 corresponding to the fourth cavity 10, then unscrew the pressure relief bolt 13 corresponding to the second cavity 8, and finally take out the second forming die 4 corresponding to the second cavity 8.

[0038] Step 3: Lay the third pressure system. Fill the prepared pulverized coal similar material into the third cavity 9, then fill the surrounding rock interlayer similar material into the corresponding laying channel 18, and then tap the pulverized coal similar material and the surrounding rock interlayer similar material forcefully. Immediately, unscrew the pressure relief bolt 13 corresponding to the fourth cavity 10, then unscrew the pressure relief bolt 13 corresponding to the third cavity 9, and finally take out the third forming die 5 corresponding to the third cavity 9;

[0039] Step 4: Lay the fourth pressure system. Fill the prepared pulverized coal similar material into the fourth cavity, then fill the surrounding rock interlayer similar material into the corresponding laying channel 18, and then tap the pulverized coal similar material and the surrounding rock interlayer similar material forcefully. Immediately, unscrew the pressure relief bolt 13 corresponding to the fourth cavity 10, and finally take out the fourth forming die 6 corresponding to the fourth cavity 10; After the above steps, the laying preparation work of the multi-pressure system can be completed, and finally, a press is used for pressing and forming.

[0040] In the present invention, each forming die is designed with a pressure relief bolt, so that for the previously formed pressure system, under the condition of pressure relief by unscrewing the pressure relief bolt at the far end, the forming die can be taken out, and at the same time, it is ensured that the pulverized coal and the surrounding rock interlayer similar material are fixed at the preset spatial positions, which also optimizes the sealing effect between different pressure systems, and the maximum sealing pressure between the systems can reach 1.8 MPa.

[0041] In the present invention, the pressure system can maximize the restoration of the accumulation characteristics of the multi-pressure system, can not only ensure the sealing between the pressure systems, but also realize the stress transfer between the coal reservoir and the surrounding rock interlayer, which has practical guiding significance for improving the true restoration of the development of the multi-pressure system and efficiently developing unconventional natural gas.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A multi-pressure system simulator, comprising a main cavity (1) and a cover plate (2), characterized in that, The cover plate (2) is movably connected to the top of the main cavity (1). A first pressure system, a second pressure system, a third pressure system, and a fourth pressure system are provided in the main cavity (1). The first pressure system, the second pressure system, the third pressure system, and the fourth pressure system respectively include a first forming die (3), a second forming die (4), a third forming die (5), and a fourth forming die (6). A laying channel (18) corresponding to the first forming die (3), the second forming die (4), the third forming die (5), and the fourth forming die (6) is provided inside the main cavity (1). A first cavity (7), a second cavity (8), a third cavity (9), and a fourth cavity (10) are sequentially provided in the first forming die (3), the second forming die (4), the third forming die (5), and the fourth forming die (6). A backing plate (11) is provided at the inner bottom of each of the first cavity (7), the second cavity (8), the third cavity (9), and the fourth cavity (10). Connecting blocks (12) are fixedly connected to the tops of the adjacent sides of the first forming die (3), the second forming die (4), the third forming die (5), and the fourth forming die (6). The adjacent two connecting blocks (12) are fixedly connected by a pressure relief bolt (13).

2. The multi-pressure system simulator according to claim 1, wherein A plurality of fixing holes (14) corresponding to the cover plate (2) are provided at the top of the main cavity (1).

3. The multi-pressure system simulator according to claim 1, wherein A plurality of fixing grooves are provided at the bottom of the main cavity (1).

4. A multi-pressure system simulator according to claim 1, characterized in that, A support rod (15) is fixedly connected to one end of the main cavity (1) close to the first forming die (3). The first forming die (3) and the support rod (15) are fixedly connected by a plurality of fastening bolts (16).

5. A multi-pressure system simulator according to claim 1, characterized in that, Support blocks (17) are fixedly connected to the tops of the first forming die (3) and the fourth forming die (6). The edges of the support blocks (17) are in contact with the inner wall of the main cavity (1).

6. The multi-pressure system simulator according to claim 1, characterized in that, The backing plate (11) is made of a metal foam board.

7. The operating method of a multi-pressure system simulator according to claim 1, characterized in that It includes the following steps: Step 1: Lay the first pressure system. Fill the prepared coal powder similar material into the first cavity (7), then fill the surrounding rock interlayer similar material into the corresponding laying channel (18), then forcefully tap the coal powder similar material and the surrounding rock interlayer similar material. Immediately, unscrew the pressure relief bolt (13) corresponding to the fourth cavity (10), then unscrew the pressure relief bolt (13) corresponding to the first cavity (7), and finally take out the first forming die (3) corresponding to the first cavity (7). Step 2: Lay the second pressure system. Fill the prepared coal powder similar material into the second cavity (8), then fill the surrounding rock interlayer similar material into the corresponding laying channel (18), then forcefully tap the coal powder similar material and the surrounding rock interlayer similar material. Immediately, unscrew the pressure relief bolt (13) corresponding to the fourth cavity (10), then unscrew the pressure relief bolt (13) corresponding to the second cavity (8), and finally take out the second forming die (4) corresponding to the second cavity (8). Step 3: Lay the third pressure system. Fill the third cavity (9) with the pre-prepared pulverized coal similar material, then fill the corresponding laying channel (18) with the surrounding rock interlayer similar material, and then tap the pulverized coal similar material and the surrounding rock interlayer similar material forcefully. Immediately afterwards, unscrew the pressure relief bolt (13) corresponding to the fourth cavity (10), and then unscrew the pressure relief bolt (13) corresponding to the third cavity (9). Finally, take out the third forming die (5) corresponding to the third cavity (9). Step 4: Lay the fourth pressure system. Fill the fourth with the pre-prepared pulverized coal similar material, then fill the corresponding laying channel (18) with the surrounding rock interlayer similar material, and then tap the pulverized coal similar material and the surrounding rock interlayer similar material forcefully. Immediately afterwards, unscrew the pressure relief bolt (13) corresponding to the fourth cavity (10), and finally take out the fourth forming die (6) corresponding to the fourth cavity (10). After the above steps, the laying preparation work of the multi-pressure system can be completed, and finally, it can be pressed into shape with a press.

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