Multifunctional physical simulation test method suitable for reconstruction of thin-medium thick soft and hard interbed reservoir in complex structure area

Abstract

The invention relates to a multifunctional physical simulation test method suitable for reconstruction of a thin-medium thick soft and hard interbed reservoir in a complex structure area. The multifunctional physical simulation test method comprises the following steps: manufacturing a soft, hard and thin interbed sample, manufacturing a simulation shaft, scanning and reconstructing a test piece, testing pressure, performing layered synchronous / asynchronous loading, and performing a fracturing test. According to the method, the problems that the crack initiation extension position is unknown, and the competitive extension rule between cracks is unknown in the thin-medium thick soft and hard interbed reservoir fracturing process under the longitudinal multi-stage crustal stress condition are solved, the fracturing construction scheme is optimized, and fracturing engineering construction is guided.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic fracturing, and in particular to a multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interlayer reservoirs in complex structural areas. Background Art

[0002] Unconventional natural gas such as coalbed methane and shale gas is an important resource among my country's oil and gas resources. More than 80% of its reservoir types are interlayer reservoirs. Taking the southwest region as an example, its coal reservoirs have the characteristics of many layers, large changes in vertical coal reservoir thickness, large differences in vertical ground stress, and low permeability. In addition, the rock reservoirs in the southwest region are mostly interlayered rock bodies of mudstone-coal rock-sandstone / limestone, dolomite / limestone-shale-mudstone, etc., which are difficult to transform and have poor transformation effects, resulting in low effective utilization rates of coalbed methane and shale gas resources. It is speculated that the reason why the production of unconventional natural gas in the southwest region is still sluggish is the lack of understanding of the optimization design of geological layer selection, fracturing parameter design, and the expansion and extension mechanism of fracturing cracks in interlayered rock bodies for the geological conditions of complex tectonic areas, which makes it impossible to form efficient and large-scale mining.

[0003] Large-scale multi-layer fracturing physical simulation test is one of the effective means to obtain the laws of hydraulic fracturing crack initiation, expansion and extension, and to deeply understand the interlayer interference mechanism of multi-layer fracturing. At present, domestic research on the laws of hydraulic fracturing crack initiation and expansion mainly focuses on the fracturing of a single rock mass or the fracturing of multi-lithology interlayer rock mass under the same stress conditions. There are still some differences between its indoor fracturing simulation technology and field fracturing. This is mainly manifested in that when conducting hydraulic fracturing tests on multiple rock layers, the force exerted on each rock layer is the same, and it is impossible to truly reflect the laws of hydraulic fracture initiation and expansion under different pressure conditions for the geological status of "superimposed gas-bearing systems and multiple rock layers". At present, existing research has achieved certain results in the fracturing of thin-medium-thick interlayer reservoirs, but there is little research on the hydraulic fracture initiation mechanism, extension law and interference mechanism of hydraulic fractures between composite rock layers in the combined fracturing of multiple and thin-medium-thick coal seams. Summary of the invention

[0004] The embodiment of the present invention provides a multifunctional physical simulation test method suitable for the transformation of thin-medium-thick soft and hard interlayer reservoirs in complex structural areas, which overcomes the problems of unclear crack initiation and expansion positions and unclear competition extension rules between fractures during fracturing of thin-medium-thick soft and hard interlayer reservoirs under longitudinal multi-level ground stress conditions, so as to optimize the fracturing construction plan and guide the construction of fracturing projects.

[0005] The present invention aims to provide a multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interbed reservoirs in complex structural areas, comprising the following steps:

[0006] S1. Preparation of soft and hard thin interlayer samples: Select rock blocks and bond them to form rock samples that are the same as the on-site materials, and cut them into rock samples that are consistent with the size of the confining pressure loading test box;

[0007] S2. Making a simulated wellbore: drilling one of the faces of the rock sample to form a simulated wellbore, selecting a casing made of the same material as the on-site fracturing pipe to form a simulated fracturing pipe, forming perforations on the simulated fracturing pipe, and then placing the simulated fracturing pipe in the simulated wellbore to form a test piece by bonding and sealing;

[0008] S3, specimen scanning and reconstruction: reconstructing the specimen formed in step S2 after CT scanning;

[0009] S4. Pressure test: install the specimen into the confining pressure loading test box, start the simulation device, maintain the water pressure at 0.2MPa, if no liquid flows out of the loading test box within 1 minute, it is considered that the sealing is intact; if liquid flows out within 1 minute, it is considered that the sealing is not good, and the specimen needs to be taken out to observe the integrity of the specimen and the sealing between the fracturing tube and the rock mass until the sealing is good;

[0010] The simulation device includes a host, a loading system, a pumping system, an acoustic emission crack monitoring system and a stress loading and data acquisition system control platform; the host includes a host frame and a displacement support frame; the loading system is arranged in the host, including a normal loading component and a confining pressure loading test box, the normal loading component performs normal displacement to realize normal loading of the specimen, and the confining pressure loading test box includes a specimen installation cavity for placing the specimen, a loading hydraulic cylinder for providing pressure to the specimen, and a confining pressure static loading device connected to the loading hydraulic cylinder and loading the specimen;

[0011] S5, layered synchronous / asynchronous loading: the loading hydraulic cylinder corresponds to a plurality of pressure heads, so that each rock layer of the specimen corresponds to a pressure head, and stress is applied to each layer of the specimen through the pressure head;

[0012] S6. Fracturing test: Turn on the pumping system to apply fluid pressure to the simulated wellbore until fluid flows out of the loading test box, stop the fracturing test, and perform CT scanning on the test piece after fracturing.

[0013] Furthermore, the simulated fracturing pipe is made of epoxy resin material, and before fracturing, the simulated fracturing pipe is placed in a simulated wellbore and bonded to the wall of the simulated wellbore.

[0014] Furthermore, the rock block is a single rock layer block or a multi-rock layer block.

[0015] Furthermore, when the rock block is a multi-rock layer block, it is in the form of a combination of mudstone, coal rock, sandstone, coal seam, and shale, or a combination of coal rock, mudstone, and coal seam, or a combination of coal rock, shale, sandstone, and coal seam.

[0016] Furthermore, the size of the rock block is less than or equal to the volume of the specimen installation cavity, and the specimen installation cavity is a cube of 300 mm×300 mm×600 mm.

[0017] Preferably, the size of the rock block is 300mm×300mm×600mm, 300mm×300mm×500mm, 300mm×300mm×400mm, 300mm×300mm×300mm, 150mm×150mm×150mm or 200mm×200mm×600mm.

[0018] Furthermore, the perforation is arranged in a spiral pattern, and the perforation phase angle is 0°, 30° or 60°.

[0019] Different perforation phase angles may be used for perforating rock blocks of different combinations. When fracturing different rock layers of the same rock block, the perforation phase angles corresponding to the different rock layers may also be selected to be the same or different.

[0020] Furthermore, the acoustic emission crack monitoring system needs to be checked before the fracturing test. After the test piece is installed, the surrounding of the test piece is knocked with a tool to confirm that the acoustic emission signal can be collected.

[0021] Furthermore, the normal loading component is arranged at the top of the main frame, and the normal loading component includes a normal loading cylinder, a normal displacement sensor arranged at the bottom of the normal loading cylinder, and a normal loading plate arranged at the bottom of the normal loading cylinder and connected to the normal displacement sensor.

[0022] Furthermore, the pumping system includes a fracturing fluid tank connected to the test piece and a pumping system for providing pressure to the fracturing fluid tank, and a fluorescent agent is added to the fracturing fluid in the fracturing fluid tank.

[0023] Furthermore, the layered synchronous loading is to apply the same load to each layer of the specimen; and the layered asynchronous loading is to apply different loads to each layer of the specimen.

[0024] Furthermore, a displacement support frame is provided at the bottom of the loading experiment box, and the loading experiment box is driven to move forward and backward by the movement of the displacement support frame, thereby realizing the loading and unloading of the test piece.

[0025] Furthermore, a hoisting device for hoisting the test piece is also provided on the top of the main machine, and a normal loading component for applying a normal force to the test piece is provided on the top of the main machine frame.

[0026] Compared with the prior art, the beneficial technical effects of the present invention are:

[0027] The present invention relies on a multifunctional physical simulation system for thin-medium-thick soft-hard interlayer reservoir transformation, realizes applying the same force or different forces to different layers, and thus proposes a new hydraulic fracturing test method for reservoir transformation of soft-hard thin interlayers in complex tectonic areas. This method is not only convenient for single rock layer hydraulic fracturing tests and synchronous / asynchronous hydraulic fracturing tests of multiple thin rock layers, but also can perform real-time dynamic monitoring of the initiation, extension and expansion of cracks during the hydraulic fracturing process, and more realistically restore the combined fracturing and single-layer fracturing conditions of thin-medium-thick soft-hard interlayers, especially the combined fracturing conditions of multiple thin coal seams, providing experimental and theoretical basis for optimizing reservoir transformation schemes of multiple thin coal seams with thin, medium-thick soft-hard interlayers.

[0028] The multifunctional physical simulation system of the present invention can be used for simulating hydraulic fracturing tests of various types of rock formations, and can also achieve accurate simulated fracturing for relatively complex interlayered rock masses, which has positive significance for large-scale and efficient exploitation of natural gas in different rock masses.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Attached Figure 1 The present invention is a flow chart of a multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interbed reservoirs in complex structural areas.

[0032] Attached Figure 2 The present invention is a schematic diagram of the workflow of a multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interbed reservoirs in complex structural areas.

[0033] Attached Figure 3 The present invention is a schematic structural diagram of a simulation device in a multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interlayer reservoirs in complex structural areas.

[0034] Attached Figure 4 The present invention is a schematic diagram of the layered structure of rock specimens in a multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interlayer reservoirs in complex structural areas.

[0035] Attached Figure 5The present invention is a schematic diagram of different perforation positions in a multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interlayer reservoirs in complex structural areas.

[0036] In the attached drawings, 1 is a host machine; 2 is a loading system; 3 is a pumping system; 3a is a gas cylinder; 3b is a gas control valve; 3c is a gas pipeline; 3d is a water pressure control valve; 3e is a liquid pipeline; 3f is a liquid tank; 3g is a booster pump; 4 is an acoustic emission crack monitoring system; 4a is an acoustic emission acquisition system; 4b is an acoustic emission instrument; 4c is an acoustic emission amplifier; 4d is an acoustic emission probe; 4e is an acoustic emission connecting wire; 5 is a stress loading and data acquisition system control platform; 6 is a fracturing wellbore; 7 is a host machine frame; 8 is a test piece; 9 is a loading experiment box; 10 is a supporting base; 11 is a translation bracket; 12 is a confining pressure flap supporting plate; 13 is a normal loading component; 14 is the first layer of rock mass; 15 is the second layer of rock mass; 16 is the third layer of rock mass; 17 is the fourth layer of rock mass; 19 is the fifth layer of rock mass; 20 is the sixth layer of rock mass; 18 is a loading pressure head; 21 is a perforation; 22 is a perforation position when the first layer, the third layer and the fifth layer of rock mass are subjected to fracturing; 23 is a perforation position when the second layer and the fifth layer of rock mass are subjected to fracturing; 24 is a perforation position when the second layer and the fifth layer of rock mass are subjected to fracturing. DETAILED DESCRIPTION

[0037] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0038] A multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interbedded reservoirs in complex structural areas, comprising the following steps:

[0039] S1. Make soft and hard thin interlayer samples:

[0040] Rock blocks are selected and bonded to form a rock sample that is the same as the on-site material, and are cut to form a rock sample that is consistent with the size of the confining pressure loading test box 9. The rock blocks can be coal blocks directly taken out from the mine, or other unconventional gas reservoirs and their top and bottom plate materials. The rock sample formed by bonding and cutting is consistent with the size of the confining pressure loading test box 9, and the thickness of each rock block layer is the same as the layer height of the confining pressure loading test box 9.

[0041] The specimen installation cavity of the confining pressure loading test box 9 is a cube of 300mm×300mm×600mm. The confining pressure loading test box 9 has six layers (hereinafter respectively represented by the first rock layer 14, the second rock layer 15, the third rock layer 16, the fourth rock layer 17, the fifth rock layer 19, and the sixth rock layer 20), with thicknesses of 100mm, 150mm, 50mm, 50mm, 100mm, and 150mm, respectively. The internal space of the specimen installation cavity can be changed by adding or removing steel plates to adapt to hydraulic fracturing simulation tests of rock formations of various sizes, such as 300mm×300mm×600mm, 300mm×300mm×500mm, 300mm×300mm×400mm, 300mm×300mm×300mm, 150mm×150mm×150mm, or 200mm×200mm×600mm specimens can be simulated.

[0042] In order to match the rock sample with the confining pressure loading test box 9, the combination forms of the rock sample when bonding include but are not limited to those in Table 1. The combination of each rock layer can be a combination of mudstone, coal rock, sandstone, coal seam, and shale, or a combination of coal rock, mudstone, and coal seam, or a combination of coal rock, shale, sandstone, and coal seam. The combination form of the rock layer of the present invention is not limited to the above-mentioned combination forms. The present invention only lists several common rock layer combination forms. Other types of rock layer combination forms can also be simulated by the method of the present invention.

[0043] Table 1 Combination of thin-medium-thick interbedded rock samples

[0044]

[0045]

[0046] S2. Making a simulated wellbore 6:

[0047] A simulated wellbore 6 is formed by drilling on one of the faces of the rock sample, and a casing that is consistent with the material of the on-site fracturing pipe is selected to form a simulated fracturing pipe. The simulated fracturing pipe is made of epoxy resin material, and perforations are formed on the simulated fracturing pipe. Then, the simulated wellbore 6 is placed and bonded and sealed with the well wall of the simulated wellbore 6 to form a test piece. The perforation is spirally arranged, and the perforation phase angle is 0°, 30° or 60°.

[0048] In one embodiment, the first layer, the third layer, and the fifth layer of the rock mass are fractured, and the perforation positions are located at the first layer, the third layer, and the fifth layer of the rock mass. The phase angle is 30° in the first layer of the rock mass, and the phase angle is 0° in the third layer and the fifth layer of the rock mass.

[0049] In another embodiment, the second layer and the fifth layer of the rock mass are fractured, and the perforation positions are located at the second layer and the fifth layer of the rock mass, with a phase angle of 30°.

[0050] In another embodiment, the second layer and the fifth layer of the rock mass are fractured, and the perforation positions are located at the second layer and the fifth layer of the rock mass, with a phase angle of 0°.

[0051] S3. Specimen scanning and reconstruction:

[0052] The specimen formed in step S2 is reconstructed after CT scanning, CT scanning slices are obtained, the distribution of cracks on the surface of each rock block is recorded, and the experimental rock mass is reconstructed using three-dimensional visualization software to display the distribution position and morphology of the original cracks inside the specimen.

[0053] S4. Pressure test:

[0054] The simulation device includes a main unit 1, a loading system 2, a pumping system 3, an acoustic emission crack monitoring system 4 and a stress loading and data acquisition system control platform 5; the main unit 1 includes a main unit 1 frame and a displacement support frame; the loading system 2 is arranged in the main unit 1, including a normal loading component 13 and a confining pressure loading experimental box 9, the normal loading component 13 performs normal displacement to realize normal loading of the specimen, and the confining pressure loading experimental box 9 includes a specimen installation cavity for placing the specimen, a loading hydraulic cylinder for providing pressure to the specimen, and a confining pressure static loading device connected to the loading hydraulic cylinder and loading the specimen.

[0055] The acoustic emission crack monitoring system 4 includes an acoustic emission connector arranged on the outer wall of the loading experiment box 9, an acoustic emission probe 4d on the inner wall of the specimen installation cavity, and an acoustic emission instrument 4b for controlling the acoustic emission; an acoustic emission amplifier 4c is also connected between the acoustic emission instrument 4b and the acoustic emission connector through an acoustic emission connecting wire 4e, and the acoustic emission connector is wirelessly connected to the acoustic emission collection system 4a.

[0056] A lifting device for lifting the specimen is provided on the top of the host 1, and a normal loading component 13 for applying a normal force to the specimen is provided on the top of the frame of the host 1. The specimen is placed in the specimen installation cavity of the loading experiment box 9 using the lifting device, and each pipeline is connected. A displacement support frame is provided at the bottom of the loading experiment box 9, and the displacement support frame includes a support base 10, a translation support 11 provided on the support base 10, and a confining pressure flap support plate 12 slidably provided on the translation support 11. The loading experiment box 9 is driven to move forward and backward by the movement of the displacement support frame, thereby realizing the loading and unloading of the specimen.

[0057] Conduct sealing test and acoustic emission signal test on the equipment:

[0058] Start the simulation device and maintain the water pressure at 0.2MPa. If no liquid flows out of the loading test box 9 within 1 minute, the sealing is considered to be intact. If liquid flows out within 1 minute, the sealing is considered to be poor, and the test piece needs to be taken out to observe the integrity of the test piece and the sealing between the fracturing tube and the rock mass until the sealing is good. Use tools to knock around the test piece to observe whether the acoustic emission signal is collected to ensure that the crack initiation and expansion can be monitored in real time during the test.

[0059] S5, hierarchical synchronous / asynchronous loading:

[0060] Normal pressure and confining pressure are applied to the specimen, and the loading hydraulic cylinder corresponds to multiple pressure heads, so that each rock layer of the specimen corresponds to a pressure head, and stress is applied to each layer of the specimen through the pressure head.

[0061] Layered synchronous loading is to apply the same load to each layer of the specimen.

[0062] Layered asynchronous loading is to apply different loads to each layer of the specimen. For example, the following layered asynchronous loading method can be used: the first layer 14 of the rock mass is applied with a pressure of 5MPa, the second layer 15 of the rock mass is applied with a pressure of 8MPa, the third layer 16 of the rock mass is applied with a pressure of 11MPa, the fourth layer 17 of the rock mass is applied with a pressure of 14MPa, the fifth layer 19 of the rock mass is applied with a pressure of 17MPa, and the sixth layer 20 of the rock mass is applied with a pressure of 20MPa.

[0063] S6. Fracturing test:

[0064] The pumping system 3 is turned on to apply fluid pressure to the simulated wellbore 6. The pumping system 3 includes a fracturing fluid tank connected to the test piece and a pumping system for providing pressure to the fracturing fluid tank. The fracturing fluid tank can be a liquid tank 3f or a gas cylinder 3a. The fluid in the fracturing fluid tank is liquid or gas. The liquid can be slippery water or clean water with fluorescent agent added; the gas can be carbon dioxide. A gas control valve 3b is provided on the gas pipeline 3c between the gas cylinder 3a and the test piece, and a water pressure control valve 3d is provided on the liquid pipeline 3e between the liquid tank 3f and the test piece. When gas fracturing is required, the gas control valve 3b is opened and the water pressure control valve 3d is closed; when liquid fracturing is required, the water pressure control valve 3d is opened and the gas control valve 3b is closed. In a preferred embodiment, a booster pump 3g is provided in the liquid tank.

[0065] Apply fluid pressure until fluid flows out of the loading test box 9, close the pumping system 3, release the normal pressure and the confining pressure, close the acoustic emission dynamic monitoring system, and stop the fracturing test.

[0066] The specimens after fracturing were CT scanned to observe the distribution of the fluorescent agent, and the experimental rock mass was reconstructed using 3D visualization software to show the distribution position and morphological changes of the cracks and original cracks after hydraulic fracturing inside the specimens after fracturing.

[0067] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0068] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0069] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A multifunctional physical simulation test method suitable for the reconstruction of thin-medium-thick soft-hard interbedded reservoirs in complex structural areas, characterized in that: The following steps are involved: S1. Preparation of soft and hard thin interlayer samples: Select rock blocks and bond them to form rock samples that are the same as the on-site materials, and cut them into rock samples that are consistent with the size of the confining pressure loading test box; S2. Making a simulated wellbore: drilling one of the faces of the rock sample to form a simulated wellbore, selecting a casing made of the same material as the on-site fracturing pipe to form a simulated fracturing pipe, forming perforations on the simulated fracturing pipe, and then placing the simulated fracturing pipe in the simulated wellbore to form a test piece by bonding and sealing; S3, specimen scanning and reconstruction: reconstructing the specimen formed in step S2 after CT scanning; S4. Pressure test: install the specimen into the confining pressure loading test box, start the simulation device, maintain the water pressure at 0.2MPa, if no liquid flows out of the loading test box within 1 minute, it is considered that the sealing is intact; if liquid flows out within 1 minute, it is considered that the sealing is not good, and the specimen needs to be taken out to observe the integrity of the specimen and the sealing between the fracturing tube and the rock mass until the sealing is good; The simulation device includes a host, a loading system, a pumping system, an acoustic emission crack monitoring system and a stress loading and data acquisition system control platform; the host includes a host frame and a displacement support frame; the loading system is arranged in the host, including a normal loading component and a confining pressure loading test box, the normal loading component performs normal displacement to realize normal loading of the specimen, and the confining pressure loading test box includes a specimen installation cavity for placing the specimen, a loading hydraulic cylinder for providing pressure to the specimen, and a confining pressure static loading device connected to the loading hydraulic cylinder and loading the specimen; S5, layered synchronous / asynchronous loading: the loading hydraulic cylinder corresponds to a plurality of pressure heads, so that each rock layer of the specimen corresponds to a pressure head, and stress is applied to each layer of the specimen through the pressure head; S6. Fracturing test: Turn on the pumping system to apply fluid pressure to the simulated wellbore until fluid flows out of the loading test box, stop the fracturing test, and perform CT scanning on the test piece after fracturing.

2. A multifunctional physical simulation test method suitable for thin-medium-thick soft-hard interbed reservoir reconstruction in complex structural areas as claimed in claim 1, characterized in that: The simulated fracturing pipe is made of epoxy resin material. Before fracturing, the simulated fracturing pipe is placed in a simulated wellbore and bonded to the well wall of the simulated wellbore.

3. A multifunctional physical simulation test method suitable for thin-medium-thick soft-hard interbed reservoir reconstruction in complex structural areas as claimed in claim 1, characterized in that: The perforation is arranged in a spiral pattern, and the perforation phase angle is 0°, 30° or 60°.

4. A multifunctional physical simulation test method suitable for thin-medium-thick soft-hard interbed reservoir reconstruction in complex structural areas as claimed in claim 1, characterized in that: The acoustic emission crack monitoring system needs to be checked before the fracturing test. After the test piece is installed, the surrounding area of ​​the test piece is knocked with a tool to confirm that the acoustic emission signal can be collected.

5. A multifunctional physical simulation test method suitable for thin-medium-thick soft-hard interbed reservoir reconstruction in complex structural areas as claimed in claim 1, characterized in that: The normal loading component is arranged on the top of the main frame, and the normal loading component includes a normal loading cylinder, a normal displacement sensor arranged at the bottom of the normal loading cylinder, and a normal loading plate arranged at the bottom of the normal loading cylinder and connected to the normal displacement sensor.

6. A multifunctional physical simulation test method suitable for thin-medium-thick soft-hard interbed reservoir reconstruction in complex structural areas as claimed in claim 1, characterized in that: The pumping system comprises a fracturing fluid tank connected to the test piece and a pumping system for providing pressure to the fracturing fluid tank. Fluorescent agent is added to the fracturing fluid in the fracturing fluid tank.

7. A multifunctional physical simulation test method suitable for reconstruction of thin-medium-thick soft-hard interbedded reservoirs in complex structural areas as claimed in claim 1, characterized in that: The layered synchronous loading is to apply the same load to each layer of the specimen; the layered asynchronous loading is to apply different loads to each layer of the specimen.

8. A multifunctional physical simulation test method suitable for thin-medium-thick soft-hard interbed reservoir reconstruction in complex structural areas as claimed in claim 1, characterized in that: A displacement support frame is arranged at the bottom of the loading experiment box, and the loading experiment box is driven to move forward and backward by the movement of the displacement support frame, thereby realizing the loading and unloading of the test piece.

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