A downhole isolation system high pressure closed simulation device and its use method

Abstract

The invention discloses a high-pressure closed simulation device for a downhole isolation system and a method for using the same. The simulation device comprises a steel pipe body, a first detection component is arranged on the outer side of the steel pipe body; an upper packer component and a lower packer component are arranged inside the steel pipe body, and the upper packer component is connected to the lower packer component through a connecting flower tube and a high-pressure connecting pipe; a detection water outlet is arranged on the connecting flower tube, and a second detection component is arranged on the outer side of the middle part of the steel pipe body. The method for using the device comprises the following steps: S1, installing the first detection component and the second detection component on the steel pipe body; S2, installing the upper packer component and the lower packer component; S3, inserting the lower packer component and the upper packer component into the steel pipe body; S4, injecting water into the upper packer component and the lower packer component; S5, injecting water into the fracturing section; S6, judging the sealing performance of the upper packer component and the lower packer component; S7, taking out the upper packer component and the lower packer component.

Description

Technical Field

[0001] The present invention relates to the field of geological detection, and in particular to a high-pressure closed simulation device for a downhole isolation system and a use method thereof. Background Art

[0002] Since the pioneering of the method of measuring geostress using hydraulic fracturing, this method has been further improved and promoted. The hydraulic fracturing (HF) and primary fracture hydraulic fracturing test (HTPF) currently carried out in boreholes are very effective means to determine the total stress tensor and are also one of the methods recommended by the International Society of Rock Mechanics for measuring geostress.

[0003] In the past 20 years, this method has been widely used in engineering design in various geological structures, such as underground nuclear waste storage, hydroelectric power stations, high-speed rail tunnels, etc. These results provide a unique data support in determining the effectiveness of ground stress.

[0004] The hydraulic fracturing method consists of a pair of straddle-type packers. After the packers are pressurized, a section of the borehole is sealed, and then the sealed section is injected with fluid to pressurize until the borehole wall is broken and extended. When the borehole section sealed by a set of straddle-type packers is pressurized, a pressure-time recording curve will be recorded. According to the measurement curve, the fracture pressure, re-opening pressure and closing pressure of the measuring section can be determined. The maximum horizontal principal stress can be calculated using the closing pressure value. In the measuring section with obvious fracture pressure, the direction of the maximum principal stress can be determined by using an automatic directional impression device. Since the hydraulic fracturing method is simple to operate and can determine the ground stress value without rock mechanical parameters, it has the advantages of deep measurement depth, etc., and has been widely used in large-scale projects at home and abroad.

[0005] However, under actual test conditions, since the sealing performance of the packer under high pressure working conditions is unknown, if the sealing performance of the packer is poor under high pressure conditions, water leakage in the fracturing section or the packer cannot be fixed on the hole wall will occur, forcing the test to fail; and if the leakage is small, the instantaneous closing pressure will be less than the true value, thus affecting the ground stress measurement results. Therefore, it is necessary to study a simulation detection device for detecting the sealing performance of the packer to avoid the occurrence of the above problems. Summary of the invention

[0006] The object of the present invention is to provide a downhole isolation system high-pressure closed simulation device with a simple structure and convenient operation and a method for using the device in order to solve the above problems.

[0007] In order to achieve the above object, the technical solution of the present invention is:

[0008] A high-pressure closed simulation device for a downhole isolation system comprises a steel pipe body, which is in the shape of a round pipe with one end sealed, and a first detection assembly connected to the steel pipe body is arranged on the outer side of the sealed end of the steel pipe body; an upper packer assembly and a lower packer assembly are arranged inside the steel pipe body, one end of the upper packer assembly is connected to a water inlet drill pipe and a water inlet installation pipe, and the other end of the upper packer assembly is connected to one end of the lower packer assembly through a connecting flower tube and a high-pressure connecting pipe, and the other end of the lower packer assembly is blocked; a detection water outlet hole connected to the inside of the steel pipe body is arranged on the connecting flower tube, and a second detection assembly connected to the steel pipe body is arranged on the outer side of the middle part of the steel pipe body, and the second detection assembly is arranged between the upper packer assembly and the lower packer assembly.

[0009] Furthermore, the upper packer assembly and the lower packer assembly both include a rubber tube, a central connecting tube is inserted into the rubber tube, and protective steel sleeves, connecting steel bodies and fixed heads are symmetrically arranged at both ends of the rubber tube; the fixed head is in the shape of a threaded tube, and the two ends of the rubber tube are sleeved on the outside of the fixed head and the inner wall of the rubber tube is threadedly connected to the outer wall of the fixed head, and the outer sides of the two ends of the rubber tube are sleeved with protective steel sleeves, the connecting steel body is in the shape of a tube, and the connecting steel body is sleeved on the outside of the central connecting tube and the inner wall of the connecting steel body is connected to the outer wall of the central connecting tube, one end of the connecting steel body is embedded between the outer wall of the fixed head and the inner wall of the protective steel sleeve, and the other end of the connecting steel body is provided with an installation cavity and is connected to the pipeline connector through the installation cavity; a water gap is provided between the inner wall of the rubber tube and the outer wall of the central connecting tube, and the water gap is connected to the installation cavity.

[0010] Furthermore, a water inlet channel is provided in the water inlet drill rod, one end of the water inlet drill rod is connected to one end of the central connecting pipe in the upper packer assembly and the water inlet channel is connected to the inside of the central connecting pipe, and the other end of the central connecting pipe is connected to the lower packer assembly through a connecting flower tube; one end of the water inlet mounting pipe is connected to the pipe connector at one end of the upper packer assembly, and the pipe connector at the other end of the upper packer assembly is connected to the lower packer assembly through a high-pressure connecting pipe.

[0011] Furthermore, one end of the central connecting pipe in the lower packer assembly is connected to one end of the connecting flower pipe, and the other end of the central connecting pipe is blocked; the pipe connector at one end of the lower packer assembly is connected to one end of the high-pressure connecting pipe, and the pipe connector at the other end of the lower packer assembly is blocked.

[0012] Furthermore, the first detection component includes a first pressure sensor and a first pressure gauge, and the first pressure sensor and the first pressure gauge are both connected to the interior of the steel pipe body; the second detection component includes a second pressure sensor and a second pressure gauge, and the second pressure sensor and the second pressure gauge are both connected to the interior of the steel pipe body; high-pressure ball valves are provided on the installation pipelines of the first pressure gauge and the second pressure gauge, and the first pressure sensor and the second pressure sensor are both connected to the signal input end of the computer.

[0013] A method for using a downhole isolation system high pressure sealing simulation device comprises the following steps:

[0014] S1. Install a first detection assembly and a second detection assembly on a steel pipe body, and connect a first pressure sensor in the first detection assembly and a second pressure sensor in the second detection assembly to a signal input terminal of a computer;

[0015] S2, connect one end of the upper packer assembly to the water inlet drill pipe and the water inlet installation pipe, use the connecting flower pipe and the high-pressure connecting pipe to connect the other end of the upper packer assembly to one end of the lower packer assembly, and then block the other end of the lower packer assembly;

[0016] S3, injecting water into the steel pipe body, then opening the high-pressure ball valves in the first detection assembly and the second detection assembly, inserting the lower packer assembly and the upper packer assembly into the steel pipe body in sequence, and positioning the second detection assembly between the lower packer assembly and the upper packer assembly;

[0017] S4. Close the high-pressure ball valves in the first detection assembly and the second detection assembly; then use a high-pressure pump to inject high-pressure water into the water inlet installation pipe, gradually increasing from 5MPa to 20MPa, and increasing by 5MPa every 10 minutes. The high-pressure water flows through the water gap in the upper packer assembly, the high-pressure connecting pipe, and the water gap in the lower packer assembly in turn; under the action of the high-pressure water, the rubber tube in the upper packer assembly and the rubber tube in the lower packer assembly expand and deform, so that the outer wall of the rubber tube is in close contact with the inner wall of the steel pipe body, so that a closed space is formed inside the steel pipe body between the upper packer assembly and the lower packer assembly;

[0018] S5. Use a high-pressure pump to inject high-pressure water into the water inlet channel in the water inlet drill pipe, increasing the pressure by 5MPa every 10 minutes until it reaches 18MPa; the high-pressure water flows into the confined space from the detection water outlet through the water inlet channel, the center connecting pipe in the upper packer assembly, and the connecting flower pipe in sequence;

[0019] S6. During the operation of step S5, the pressure of the middle and bottom of the steel pipe body is detected by the first detection component and the second detection component; in the pressurization stage, when the detection values ​​of the first detection component and the second detection component do not decrease, it indicates that the sealing performance of the upper packer component and the lower packer component is good; when the detection values ​​of the first detection component and the second detection component decrease, it indicates that the sealing performance of the upper packer component and the lower packer component is poor, and the sealing performance of the upper packer component and the lower packer component needs to be enhanced;

[0020] S7. After the inspection is completed, open the high-pressure ball valve and the drain valve provided on the high-pressure pump to allow the pressure in the upper packer assembly and the lower packer assembly to naturally return to the original state, and then remove the upper packer assembly and the lower packer assembly from the steel pipe body.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects:

[0022] The present invention adopts a design that an upper packer assembly and a lower packer assembly are arranged in a steel pipe body, and the upper packer assembly and the lower packer assembly are connected by a connecting flower pipe and a high-pressure connecting pipe, so that people can conveniently perform water injection operations on the steel pipe body between the upper packer assembly and the lower packer assembly through a water inlet installation pipe and a water inlet drill rod; at the same time, a first detection assembly is arranged at the sealing end of the steel pipe body, so that it can simulate and detect the water pressure at the bottom of the borehole, and the difficulty of the pressure difference in the upper and lower pressures in the borehole can be considered according to the simulated pressure difference. The utility model is simple in operation, convenient and fast in operation, and can effectively simulate and detect the sealing performance of the upper and lower packer assemblies in the borehole, thereby avoiding the situation in which the upper and lower packer assemblies leak in actual operation and cause inaccurate ground stress measurement results, thereby bringing convenience to geological detection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 Schematic diagram of the structure of the upper packer assembly. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0027] like Figure 1 , Figure 2 As shown, the present embodiment discloses a high-pressure closed simulation device for a downhole isolation system, comprising a steel pipe body 1, which is in the shape of a circular tube with one end sealed, and a first detection component connected to the steel pipe body 1 is arranged on the outer side of the sealed end of the steel pipe body 1; an upper packer component 2 and a lower packer component 3 are arranged inside the steel pipe body 1, one end of the upper packer component 2 is connected to a water inlet drill pipe 4 and a water inlet installation pipe 5, and the other end of the upper packer component 2 is connected to one end of the lower packer component 3 through a connecting flower pipe 7 and a high-pressure connecting pipe 6, and the other end of the lower packer component 3 is blocked; the connecting flower pipe 7 is provided with a detection water outlet 701 connected to the inside of the steel pipe body 1, and a second detection component connected to the steel pipe body 1 is arranged on the outer side of the middle part of the steel pipe body 1, and the second detection component is arranged between the upper packer component 2 and the lower packer component 3.

[0028] The upper packer assembly 2 and the lower packer assembly 3 both include a rubber tube 201, a central connecting tube 204 is inserted into the rubber tube 201, and protective steel sleeves 203, connecting steel bodies 205 and fixed heads 202 are symmetrically arranged at both ends of the rubber tube 201; the fixed head 202 is in the shape of a threaded tube, and the two ends of the rubber tube 201 are sleeved on the outside of the fixed head 202, and the inner wall of the rubber tube 201 is threadedly connected to the outer wall of the fixed head 202, and the two ends of the rubber tube 201 are sleeved on the outside of the protective steel sleeves 203, the connecting steel body 205 is in the shape of a tube, and the connecting steel The body 205 is sleeved on the outside of the central connecting pipe 204 and the inner wall of the connecting steel body 205 is connected to the outer wall of the central connecting pipe 204. One end of the connecting steel body 205 is embedded between the outer wall of the fixed head 202 and the inner wall of the protective steel sleeve 203. The other end of the connecting steel body 205 is provided with an installation cavity 206 and is connected to the pipe connector 208 through the installation cavity 206; a water gap 207 is provided between the inner wall of the rubber tube 201 and the outer wall of the central connecting pipe 204, and the water gap 207 is connected to the installation cavity 206.

[0029] The water gap is used to supply water to the upper packer assembly and the lower packer assembly and expand the rubber tubes in the upper packer assembly and the lower packer assembly, so as to form a sealing state between the outer wall of the rubber tube and the inner wall of the steel pipe body;

[0030] A water inlet channel is provided in the water inlet drill rod 4, one end of the water inlet drill rod 4 is connected to one end of the central connecting pipe 204 in the upper packer assembly 2 and the water inlet channel is connected to the inside of the central connecting pipe 204, and the other end of the central connecting pipe 204 is connected to the lower packer assembly 3 through a connecting flower pipe 7; one end of the water inlet installation pipe 5 is connected to the pipe connector 208 at one end of the upper packer assembly 2, and the pipe connector at the other end of the upper packer assembly 2 is connected to the lower packer assembly 3 through a high-pressure connecting pipe 6.

[0031] One end of the central connecting pipe in the lower packer assembly 3 is connected to one end of the connecting flower pipe 7, and the other end of the central connecting pipe is blocked; the pipe connector at one end of the lower packer assembly 3 is connected to one end of the high-pressure connecting pipe 6, and the pipe connector at the other end of the lower packer assembly 3 is blocked.

[0032] The water inlet installation pipe, the water gap in the upper packer assembly, the high-pressure connecting pipe, and the water gap in the lower packer assembly together form a packer water injection channel, thereby performing water injection operations for the upper packer assembly and the lower packer assembly; the water inlet drill pipe, the central connecting pipe, and the connecting flower pipe constitute a test water injection channel, which forms water pressure in the steel pipe body between the upper packer assembly and the lower packer assembly, thereby testing the sealing of the upper packer assembly and the lower packer assembly;

[0033] The first detection component includes a first pressure sensor 8 and a first pressure gauge 9, and the first pressure sensor 8 and the first pressure gauge 9 are both connected to the interior of the steel pipe body 1; the second detection component includes a second pressure sensor 11 and a second pressure gauge 12, and the second pressure sensor 11 and the second pressure gauge 12 are both connected to the interior of the steel pipe body 1; a high-pressure ball valve 10 is provided on the installation pipeline of the first pressure gauge 9 and the second pressure gauge 12, and the first pressure sensor 8 and the second pressure sensor 11 are both connected to the signal input end of the computer.

[0034] The opening and closing operation of the high-pressure ball valve can facilitate the insertion of the upper packer assembly and the lower packer assembly into the steel pipe body; at the same time, by storing water at the sealing end of the steel pipe body and using the first detection assembly to detect its water pressure, the pressure value at the bottom of the borehole can be simulated, which facilitates people's drill rod removal operation.

[0035] A method for using a downhole isolation system high pressure sealing simulation device comprises the following steps:

[0036] S1. Install a first detection assembly and a second detection assembly on the steel pipe body 1, and connect the first pressure sensor 8 in the first detection assembly and the second pressure sensor 11 in the second detection assembly to the signal input terminal of the computer;

[0037] S2, connect one end of the upper packer assembly 2 with the water inlet drill pipe 4 and the water inlet installation pipe 5, use the connecting flower pipe 7 and the high-pressure connecting pipe 6 to connect the other end of the upper packer assembly 2 with one end of the lower packer assembly 3, and then block the other end of the lower packer assembly 3;

[0038] S3, inject water into the steel pipe body 1, then open the high-pressure ball valves 10 in the first detection assembly and the second detection assembly, insert the lower packer assembly 3 and the upper packer assembly 2 into the steel pipe body 1 in sequence, and make the second detection assembly located between the lower packer assembly 3 and the upper packer assembly 2;

[0039] S4, close the high-pressure ball valve 10 in the first detection component and the second detection component; then use a high-pressure pump to inject high-pressure water into the water inlet installation pipe 5, gradually increasing from 5MPa to 20MPa, increasing by 5MPa every 10 minutes, and collect the pressure change situation at each pressure stage; the high-pressure water flows through the water gap 207 in the upper packer component 2, the high-pressure connecting pipe 6, and the water gap in the lower packer component 3 in turn; under the action of the high-pressure water, the rubber tube 201 in the upper packer component 2 and the rubber tube in the lower packer component 3 expand and deform, so that the outer wall of the rubber tube is in close contact with the inner wall of the steel pipe body 1, so that a closed space (i.e., fracturing section) is formed inside the steel pipe body 1 between the upper packer component 2 and the lower packer component 3;

[0040] S5. Use a high-pressure pump to inject high-pressure water into the water inlet channel in the water inlet drill pipe 4, increase the pressure by 5MPa every 10 minutes until it reaches 18MPa, and collect the pressure change situation at each pressure stage; the high-pressure water flows into the confined space from the detection water outlet 701 after passing through the water inlet channel, the central connecting pipe 204 in the upper packer assembly 2, and the connecting flower pipe 7 in sequence;

[0041] S6. During the operation of step S5, the pressure in the middle and bottom of the steel pipe body 1 is detected by the first detection component and the second detection component; in the pressurization stage, when the detection values ​​of the first detection component and the second detection component do not decrease, it indicates that the sealing performance of the upper packer component 2 and the lower packer component 3 is good; when the detection values ​​of the first detection component and the second detection component decrease, it indicates that the sealing performance of the upper packer component 2 and the lower packer component 3 is poor, and the sealing performance of the upper packer component 2 and the lower packer component 3 needs to be enhanced;

[0042] S7. After the detection is completed, open the high-pressure ball valve 10 and the drain valve provided on the high-pressure pump to allow the pressure in the upper packer assembly 2 and the lower packer assembly 3 to naturally return to the original state, and then remove the upper packer assembly 2 and the lower packer assembly 3 from the steel pipe body 1.

[0043] The main body of the present invention is a steel pipe body, which can withstand a pressure of more than 70MPa and can simulate the long-term working state of the packer at more than 25MPa; at the same time, a pressure gauge and a sensor are installed in the fracturing section (i.e., the steel pipe body part between the upper packer assembly and the lower packer assembly), which can monitor the pressure change of the fracturing section in real time, and the pressure sensor can be used to transmit the fracturing change signal to the computer for collection. In addition, the present invention arranges a pressure gauge and a sensor at the bottom of the sealing end of the steel pipe body, which can simulate the difficulty that the upper and lower pressure differences may cause to the test equipment when the packer assembly is close to the bottom of the borehole for experiments, further verifying the simulation effect of the packer assembly.

[0044] The present invention adopts a design that an upper packer assembly and a lower packer assembly are arranged in a steel pipe body, and the upper packer assembly and the lower packer assembly are connected by a connecting flower pipe and a high-pressure connecting pipe, so that people can conveniently perform water injection operations on the steel pipe body between the upper packer assembly and the lower packer assembly through a water inlet installation pipe and a water inlet drill rod; at the same time, a first detection assembly is arranged at the sealing end of the steel pipe body, so that it can simulate and detect the water pressure at the bottom of the borehole, and the difficulty of the pressure difference in the upper and lower pressures in the borehole can be considered according to the simulated pressure difference. The utility model is simple in operation, convenient and fast in operation, and can effectively simulate and detect the sealing performance of the upper and lower packer assemblies in the borehole, thereby avoiding the situation in which the upper and lower packer assemblies leak in actual operation and cause inaccurate ground stress measurement results, thereby bringing convenience to geological detection work.

Claims

1. A method for using a high-pressure closed simulation device for a downhole isolation system, characterized in that: The downhole isolation system high-pressure closed simulation device comprises a steel pipe body, which is in the shape of a round tube with one end sealed, and a first detection component connected to the steel pipe body is arranged outside the sealed end of the steel pipe body; an upper packer component and a lower packer component are arranged inside the steel pipe body, one end of the upper packer component is connected to the water inlet drill pipe and the water inlet installation pipe, and the other end of the upper packer component is connected to one end of the lower packer component through a connecting flower tube and a high-pressure connecting pipe, and the other end of the lower packer component is blocked; a detection water outlet hole connected to the inside of the steel pipe body is arranged on the connecting flower tube, and a second detection component connected to the steel pipe body is arranged outside the middle part of the steel pipe body, and the second detection component is arranged between the upper packer component and the lower packer component; The method of use includes the following steps: S1. Install a first detection assembly and a second detection assembly on a steel pipe body, and connect a first pressure sensor in the first detection assembly and a second pressure sensor in the second detection assembly to a signal input terminal of a computer; S2, connect one end of the upper packer assembly to the water inlet drill pipe and the water inlet installation pipe, use the connecting flower pipe and the high-pressure connecting pipe to connect the other end of the upper packer assembly to one end of the lower packer assembly, and then block the other end of the lower packer assembly; S3, injecting water into the steel pipe body, then opening the high-pressure ball valves in the first detection assembly and the second detection assembly, inserting the lower packer assembly and the upper packer assembly into the steel pipe body in sequence, and positioning the second detection assembly between the lower packer assembly and the upper packer assembly; S4. Close the high-pressure ball valves in the first detection assembly and the second detection assembly; then use a high-pressure pump to inject high-pressure water into the water inlet installation pipe, gradually increasing from 5MPa to 20MPa, and increasing by 5MPa every 10 minutes. The high-pressure water flows through the water gap in the upper packer assembly, the high-pressure connecting pipe, and the water gap in the lower packer assembly in turn; under the action of the high-pressure water, the rubber tube in the upper packer assembly and the rubber tube in the lower packer assembly expand and deform, so that the outer wall of the rubber tube is in close contact with the inner wall of the steel pipe body, so that a closed space is formed inside the steel pipe body between the upper packer assembly and the lower packer assembly; S5. Use a high-pressure pump to inject high-pressure water into the water inlet channel in the water inlet drill pipe, increasing the pressure by 5MPa every 10 minutes until it reaches 18MPa; the high-pressure water flows into the confined space from the detection water outlet through the water inlet channel, the center connecting pipe in the upper packer assembly, and the connecting flower pipe in sequence; S6. During the operation of step S5, the pressure of the middle and bottom of the steel pipe body is detected by the first detection component and the second detection component; in the pressurization stage, when the detection values ​​of the first detection component and the second detection component do not decrease, it indicates that the sealing performance of the upper packer component and the lower packer component is good; when the detection values ​​of the first detection component and the second detection component decrease, it indicates that the sealing performance of the upper packer component and the lower packer component is poor, and the sealing performance of the upper packer component and the lower packer component needs to be enhanced; S7. After the inspection is completed, open the high-pressure ball valve and the drain valve provided on the high-pressure pump to allow the pressure in the upper packer assembly and the lower packer assembly to naturally return to the original state, and then remove the upper packer assembly and the lower packer assembly from the steel pipe body.

2. The method for using the downhole isolation system high pressure closed simulation device according to claim 1, characterized in that: The upper packer assembly and the lower packer assembly both include a rubber tube, a central connecting tube is inserted into the rubber tube, and protective steel sleeves, connecting steel bodies and fixed heads are symmetrically arranged at both ends of the rubber tube; the fixed head is in the shape of a threaded tube, and the two ends of the rubber tube are sleeved on the outside of the fixed head and the inner wall of the rubber tube is threadedly connected to the outer wall of the fixed head, and the outer sides of the two ends of the rubber tube are sleeved with protective steel sleeves, the connecting steel body is in the shape of a tube, the connecting steel body is sleeved on the outside of the central connecting tube and the inner wall of the connecting steel body is connected to the outer wall of the central connecting tube, one end of the connecting steel body is embedded between the outer wall of the fixed head and the inner wall of the protective steel sleeve, and the other end of the connecting steel body is provided with an installation cavity and is connected to the pipeline connector through the installation cavity; a water gap is provided between the inner wall of the rubber tube and the outer wall of the central connecting tube, and the water gap is connected to the installation cavity.

3. The method for using the downhole isolation system high pressure closed simulation device according to claim 2, characterized in that: A water inlet channel is provided in the water inlet drill rod, one end of the water inlet drill rod is connected to one end of the central connecting pipe in the upper packer assembly and the water inlet channel is connected to the inside of the central connecting pipe, and the other end of the central connecting pipe is connected to the lower packer assembly through a connecting flower tube; one end of the water inlet installation pipe is connected to the pipe connector at one end of the upper packer assembly, and the pipe connector at the other end of the upper packer assembly is connected to the lower packer assembly through a high-pressure connecting pipe.

4. The method for using the downhole isolation system high pressure sealing simulation device according to claim 3, characterized in that: One end of the central connecting pipe in the lower packer assembly is connected to one end of the connecting flower pipe, and the other end of the central connecting pipe is blocked; the pipe connector at one end of the lower packer assembly is connected to one end of the high-pressure connecting pipe, and the pipe connector at the other end of the lower packer assembly is blocked.

5. The method for using the downhole isolation system high pressure closed simulation device according to claim 4, characterized in that: The first detection component includes a first pressure sensor and a first pressure gauge, and the first pressure sensor and the first pressure gauge are both connected to the interior of the steel pipe body; the second detection component includes a second pressure sensor and a second pressure gauge, and the second pressure sensor and the second pressure gauge are both connected to the interior of the steel pipe body; high-pressure ball valves are provided on the installation pipelines of the first pressure gauge and the second pressure gauge, and the first pressure sensor and the second pressure sensor are both connected to the signal input end of the computer.

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