A deep reservoir similar material injection preparation maintenance device and a manufacturing method

Abstract

The application provides a deep reservoir similar material injection preparation and maintenance device, which comprises a split half mold, a top cover for closing the upper end of a sample preparation cavity, a base for closing the lower end of the sample preparation cavity, an electric compactor connected with the top cover, an injection stirring system and an external monitoring terminal connected with the injection stirring system, the split half mold and the electric compactor respectively. The application also provides a deep reservoir similar material injection preparation and maintenance method, which adopts the deep reservoir similar material injection preparation and maintenance device. The application can realize the controllability of the compaction state, the temperature condition, the stress in the mold and the sealing maintenance condition, and improve the similarity between the physical and mechanical parameters of the similar material sample and the target deep reservoir through the matching method, so as to improve the sample forming quality, the parameter consistency and the test reliability.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering physical simulation testing and similar material preparation and curing technology, and in particular to a deep reservoir similar material injection preparation and curing device and manufacturing method. Background Technology

[0002] Deep reservoirs are widely present in engineering scenarios such as deep coal mining, deep oil and gas development, underground energy storage, and geological sequestration. Their occurrence environments are typically characterized by high in-situ stress, high temperatures, and complex pore structures. To study the mechanical properties and structural evolution of deep reservoirs during extraction, injection, sequestration, or disturbance, it is often necessary to prepare similar material samples with similar physical and mechanical properties. The rationality of the proportioning, mixing uniformity, molding density, and stability of the curing environment of the similar material samples directly affect the reliability of the physical simulation test results.

[0003] Existing methods for preparing similar material samples often involve manual mixing and filling with ordinary molds or conventional compaction equipment. This approach is prone to problems such as segregation of coarse and fine particles, unstable injection volume, uneven filling, and localized density differences. Especially for similar materials simulating deep reservoir environments, the lack of integrated control over mixing and homogenization, quantitative injection, compaction, and heat and pressure curing can easily lead to deviations between the sample curing environment and the target reservoir environment, thus affecting sample consistency and parameter similarity. Furthermore, geotechnical engineering physical simulation tests require numerous similar material samples for repeated and comparative experiments. To produce a large number of samples, or to continuously produce samples with different compositions simulating different environments within a short period, the existing methods of manual mixing, filling, and ordinary mold compaction require approximately four months to produce 300 samples manually. This is inefficient, impacts the experimental schedule, and prolongs the testing time. Summary of the Invention

[0004] This invention provides a device and method for preparing and curing similar materials for deep reservoirs, which solves the problems of long preparation time, low efficiency, large deviation between samples, and poor sample consistency and parameter similarity when using ordinary manual mixing, manual filling, and ordinary mold compaction methods to prepare and cure similar material samples.

[0005] Therefore, this invention proposes a deep reservoir similar material injection preparation and curing device, comprising:

[0006] A split-type half mold, comprising two mating metal halves, which, when mated, form a sample preparation cavity for accommodating a mixture of similar materials.

[0007] The top cover seals the upper end of the sample preparation chamber;

[0008] The base seals the lower end of the sample preparation chamber;

[0009] An electric compactor is connected to the top cover;

[0010] The injection and mixing system mixes similar material components and injects the mixed similar material into the sample preparation cavity in a quantitative manner according to preset injection and mixing parameters;

[0011] An external monitoring terminal is connected to the injection mixing system, the split half mold, and the electric compactor, respectively.

[0012] Furthermore, the metal half-mold is provided with an embedded heating device, a temperature sensor and a stress sensor, and at least one of the metal half-molds is provided with an injection port at its upper end that communicates with the sample preparation cavity. The injection port is used to inject a mixture of similar materials into the sample preparation cavity and is sealed by a sealing bolt after the injection is completed.

[0013] Furthermore, the external monitoring terminal is used to set the injection mixing parameters and monitor the mixing homogenization state and quantitative injection state of the injection mixing system during the injection mixing stage. During the compaction molding and heat preservation and pressure holding static curing stages, it is used to dynamically feedback and control the embedded heating device and / or electric compactor based on temperature data, in-mold stress data and compaction process data, so that similar material samples can complete compaction molding and heat preservation and pressure holding static curing under preset temperature and preset pressure conditions.

[0014] Furthermore, the injection and mixing system includes a mixing tank, a mixing mechanism, a high-pressure gas actuator, an injection cylinder, a feeding cover, and a gas regulating valve; the injection cylinder is used to contain similar material components to be mixed or injected, and the feeding cover is used to add similar material components into the injection cylinder and close the injection cylinder; the high-pressure gas actuator is used to provide gas driving force during the injection and mixing process, and the gas regulating valve is used to regulate the gas pressure or gas flow rate.

[0015] Furthermore, in the mixing and homogenization stage, a high-pressure gas actuator pushes the similar material components in the injection cylinder into the mixing tank, and the stirring mechanism mixes and homogenizes the similar material components entering the mixing tank; in the quantitative injection stage, the mixed similar material after mixing and homogenization is transported to the injection port through the injection cylinder and injection pipeline, and quantitatively enters the sample preparation chamber through the injection port.

[0016] Furthermore, the bottom surface of the mixing tank is a plane, and the mixing mechanism includes: a telescopic shaft that can extend and retract within the mixing tank and mixing blades connected to the telescopic shaft. The rotation surface of the bottom edge of the mixing blades is a plane that is flush with the bottom surface of the mixing tank. After mixing and feeding are completed, the outlet at the bottom of the mixing tank is opened, and the telescopic shaft extends to the bottom of the mixing tank, causing the bottom edge of the mixing blades to rotate on the bottom surface of the mixing tank, thereby providing a mechanical cleaning method to sweep the residual material out of the outlet, achieving a first-level mechanical cleaning.

[0017] Furthermore, the injection cylinder includes a water cylinder, and the high-pressure gas actuator is connected to the water cylinder to provide high-pressure gas to the water cylinder. After the first mechanical cleaning, the water cylinder and the high-pressure gas actuator are opened to spray high-pressure water into the mixing tank to clean the residual materials with high-pressure water, thereby achieving a second high-pressure water cleaning.

[0018] Furthermore, after the double high-pressure water purging, the telescopic shaft and the stirring blades are raised, and high-pressure gas is directly supplied to the stirring tank through the high-pressure gas driver to purge residual materials and residual water, thereby achieving triple high-pressure gas purging.

[0019] Furthermore, the bottom of the top cover is provided with a top cover pressing boss that extends into and seals the sample preparation cavity, and the top of the top cover is provided with a spherical groove. The spherical groove is used to cooperate with the ball head of the electric compactor to receive and transmit the compaction load, so that the compaction force acts on the similar material mixture along the axial direction of the sample preparation cavity through the top cover pressing boss.

[0020] Furthermore, the split-type half mold also includes a cable assembly, which includes a sensor data line, a heating power supply cable, and a heating control cable. The sensor data line is used to transmit temperature data and in-mold stress data collected by the temperature sensor and stress sensor to an external monitoring terminal. The heating power supply cable is used to power the embedded heating device. The heating control cable is used to connect the embedded heating device to the external monitoring terminal to transmit heating control commands issued by the external monitoring terminal. The embedded heating device is disposed inside the mold wall of the metal half mold body and is located between the inner and outer walls of the metal half mold body. The temperature sensor and stress sensor are respectively disposed in sensor mounting holes on the inner wall of the metal half mold body, and the sensor mounting holes do not extend to the embedded heating device.

[0021] Furthermore, the metal half-mold has mating surfaces, with linear sealing grooves respectively provided on the two mating surfaces of one metal half-mold, and the injection port is located at the upper end of the metal half-mold; an axial sealing strip is provided in the linear sealing groove, and the two mating surfaces of the other metal half-mold form a pressing surface. When the two metal half-molds are mated, the axial sealing strip is pressed between the linear sealing groove and the pressing surface; the outer walls of both metal half-molds are provided with clamping parts, which are used to engage with clamps to keep the two metal half-molds in a closed state during sample preparation; at least two clamping parts are provided at intervals along the axial direction of the metal half-molds; the inner wall of the metal half-mold is provided with a protective coating, which covers the inner wall of the metal half-mold and the ends of the temperature sensor and stress sensor facing the sample preparation cavity.

[0022] This invention also proposes a method for preparing and maintaining deep reservoir similar materials through injection, using the aforementioned deep reservoir similar material injection preparation and maintenance device. The method includes:

[0023] Proportion determination and mixture preparation;

[0024] The prepared mixture of similar materials is quantitatively injected into the sample-making cavity of the split half mold through the injection port, and the sample-making cavity is then sealed.

[0025] A compaction load is applied to the mixture of similar materials in the sample preparation cavity to compact and shape it.

[0026] After setting the preset target temperature and preset pressure, perform in-mold heat preservation and pressure holding static curing. After the heat preservation and pressure holding static curing is completed, disassemble the split half mold and complete demolding.

[0027] Furthermore, after mixing and feeding are completed, the mixing tank undergoes a triple cleaning process. The first cleaning is mechanical removal, where the telescopic shaft extends to the bottom of the mixing tank, causing the bottom edge of the mixing blades to rotate on the bottom surface of the mixing tank, thus mechanically cleaning the residual material out of the outlet. The second cleaning is high-pressure water cleaning, where the water tank and the high-pressure gas actuator are turned on to spray high-pressure water into the mixing tank to clean the residual material. The third cleaning is high-pressure gas cleaning, where the high-pressure gas actuator directly blows high-pressure gas into the mixing tank to remove the residual material and residual water.

[0028] This invention achieves automated and precise material preparation and injection through an injection and mixing system, facilitates material injection and demolding through a split half-mold, and standardizes sample compaction and molding through the pressing of an electric compactor. An external monitoring terminal enables precise and controllable material preparation and compaction. The entire sample preparation process is automated, with short preparation time and minimal deviation between samples. Especially for large-scale and reverse-prototype sample preparation, this invention is more efficient, achieving more than 10 times the efficiency of manual sample preparation. Making 30 samples, including the curing time for heat preservation and pressure holding, takes only about 10 days.

[0029] Furthermore, this invention can also achieve controllability of compaction state, temperature conditions, in-mold stress, and sealing and curing conditions, and improve the similarity between the physical and mechanical parameters of similar material samples and the target deep reservoir through the proportioning method, thereby improving the sample forming quality, parameter consistency, and test reliability.

[0030] Furthermore, to improve the mixing uniformity and quantitative injection during the preparation and curing of similar material samples, this invention designs a triple cleaning process for the mixing tank. The first cleaning is mechanical removal, where the telescopic shaft extends to the bottom of the mixing tank, causing the bottom edge of the stirring blades to rotate on the bottom surface of the tank, mechanically sweeping away residual material. The second cleaning is high-pressure water removal, where the water tank and the high-pressure gas actuator are turned on to spray high-pressure water into the mixing tank to remove residual material. The third cleaning is high-pressure gas removal, where the high-pressure gas actuator directly blows high-pressure gas into the mixing tank to remove residual material and water. Through this triple cleaning, the remaining material in the mixing tank can be completely and thoroughly removed, allowing for the injection of new mixing material and subsequent injection. This prevents the mixing tank, which has already been filled with mixing material, from being filled with new material again, resulting in mixing of old and new materials, substandard composition of the injected new material, and affecting subsequent sample preparation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the left half of the split-type half mold provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the top cover structure provided in an embodiment of the present invention;

[0033] Figure 3 This is a working assembly drawing of a split-type half mold provided in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the working state of the injection and mixing system provided in an embodiment of the present invention;

[0035] Figure 5 This is a top view of the split half-mold fixed to the base of the compactor according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the compaction, heat preservation, pressure preservation, and static curing state of the preparation and curing device provided in the embodiment of the present invention;

[0037] Figure 7 This is a flowchart illustrating the dynamic feedback control process of an external monitoring terminal during the preparation and maintenance process, as provided in an embodiment of the present invention.

[0038] Figure 8 A flowchart illustrating the preparation and curing process of deep reservoir similar material samples provided in this embodiment of the invention;

[0039] Figure 9 This is a schematic diagram of the right half of the split-type half mold provided in an embodiment of the present invention.

[0040] Figure 10 This is a schematic diagram of the base structure provided in an embodiment of the present invention;

[0041] Figure 11 This is a schematic diagram of the working principle of mechanical cleaning in the triple cleaning process of this invention, wherein the telescopic shaft descends and the bottom edge of the stirring blades is flush with the bottom surface of the stirring tank.

[0042] Figure 12 This is a schematic diagram illustrating the working principle of high-pressure water cleaning and high-pressure air cleaning in the triple cleaning process of this invention.

[0043] Reference numerals: 1. Split-type half mold; 101. Metal half mold body; 102. Embedded heating device; 103. Temperature sensor; 104. Stress sensor; 105. Cable assembly; 106. Clamp mating part; 107. Mating surface; 108. Linear sealing groove; 109. Injection port; 110. Sealing bolt; 21. Top cover; 210. Top cover pressing boss; 22. Spherical groove; 23. Annular sealing groove; 24. Base; 240. Base clamping boss; 25. Support part; 31. Clamp; 401. Drive mechanism; 402. Control Module; 403, Digital display screen; 404, Communication interface; 405, Control button group; 406, Ball indenter; 407, Fixture; 408, Compactor base; 409, Positioning groove; 410, External monitoring terminal; 411, Monitoring and communication cable; 50, Valve; 51, Mixing tank; 52, Mixing blades; 53, High-pressure gas actuator; 54, Injection cylinder; 541, Water cylinder; 55, Feed cover; 57, Mixing mechanism; 56, Gas regulating valve; 58, Telescopic shaft; 59, Outlet; 590, Collection container; 61, Fixture clearance groove. Detailed Implementation

[0044] To provide a clearer understanding of the technical features, objectives, and effects of this invention, the invention is now described.

[0045] like Figures 1 to 6 As shown, this embodiment of the invention provides a deep reservoir similar material injection preparation and curing device, including a split half-mold 1, a top cover 21, a base 24, an injection mixing system, an electric compactor, and an external monitoring terminal 410. The split half-mold is used to form a sample preparation cavity to accommodate the similar material mixture, and to achieve heating, temperature monitoring, in-mold stress monitoring, and sealing during the sample preparation and curing process; the top cover 21 and the base 24 are used to close the upper and lower ends of the sample preparation cavity, respectively; the injection mixing system is used to mix and homogenize the similar material mixture, and to quantitatively inject the similar material mixture into the sample preparation cavity according to preset injection mixing parameters; the electric compactor is used to position and fix the assembled split half-mold 1, and to compact the similar material mixture in the sample preparation cavity through a compaction load; the external monitoring terminal 410... The control terminal 410 (e.g., a computer) is connected to the injection mixing system, the split-type half mold, and the electric compactor. During the injection mixing stage, the external monitoring terminal 410 is used to set the injection mixing parameters and monitor the mixing and injection status. During the compaction, molding, and heat-insulating / pressure-holding curing stages, the external monitoring terminal 410 is used to dynamically adjust the embedded heating device 102 and the electric compactor based on temperature data, in-mold stress data, axial pressure data, and axial displacement data. This ensures that the similar material sample is kept at a preset temperature and pressure for heat-insulating / pressure-holding, thereby completing the preparation and curing process. The following provides a detailed description of the various structural components and their relationships in this embodiment of the invention.

[0046] like Figure 1 , Figure 3 and Figure 9 As shown, the split-type half mold 1 includes two mating metal half mold bodies 101. The two metal half mold bodies 101 are mated together along the mating surface 107 to form a sample preparation cavity for containing a mixture of similar materials. Each metal half mold body 101 is provided with an embedded heating device 102, a temperature sensor 103, and a stress sensor 104. The embedded heating device 102, for example, a cylindrical or semi-cylindrical heating plate or heating pad, is disposed inside the mold wall of the metal half mold body 101 and is located between the inner and outer walls of the metal half mold body 101, for heating the mixture of similar materials in the sample preparation cavity; the temperature sensor 103 and the stress sensor 104 are respectively disposed near the inner wall of the metal half mold body 101, for monitoring the temperature state and the internal stress state during the preparation and curing process of the similar material sample.

[0047] The split-type half-die 1 also includes a cable assembly 105, which comprises a sensor data cable, a heating power supply cable, and a heating control cable. The sensor data cable transmits monitoring data collected by the temperature sensor 103 and stress sensor 104 to an external monitoring terminal 410; the heating power supply cable supplies power to the embedded heating device 102; and the heating control cable transmits control commands from the external monitoring terminal 410 to control the start / stop and heating status of the embedded heating device 102. The external monitoring terminal 410 can be a computer, a host computer, or a control terminal with data acquisition and control functions.

[0048] Temperature sensor 103 and stress sensor 104 are respectively disposed in sensor mounting holes on the inner wall of the metal half-mold 101. The sensor mounting holes do not extend to the embedded heating device 102 to avoid structural interference between the temperature sensor 103, stress sensor 104 and the embedded heating device 102. In one embodiment, a protective coating is provided on the inner wall of the metal half-mold 101. The protective coating covers the inner wall of the metal half-mold 101 and the ends of the temperature sensor 103 and stress sensor 104 facing the sample preparation cavity. This coating is used to reduce scratching of the inner wall of the metal half-mold 101 and the sensor ends during the compaction and demolding of the similar material mixture, and to improve the ease of sample demolding. The protective coating is a thin layer structure that does not affect temperature transmission and stress sensing.

[0049] One of the metal half-molds 101 has an injection port 109 at its upper end, which communicates with the sample preparation cavity. The injection port 109 is used for the injection mixing system to inject a similar material mixture into the sample preparation cavity. The injection port 109 is located above the embedded heating device 102 and above the effective molding height of the similar material sample to avoid affecting the molding area of ​​the main sample body. After injection, the injection port 109 is sealed by a sealing bolt 110 to prevent the similar material mixture from overflowing from the injection port 109 during subsequent compaction molding and heat preservation and pressure holding static curing. The two mating surfaces 107 of the metal half-mold 101 are also provided with linear sealing grooves 108, and each linear sealing groove 108 is provided with an axial sealing strip. The two mating surfaces 107 of the other metal half-mold 101 form a pressing surface. When the two metal half-molds 101 are engaged, the axial sealing strip is pressed between the linear sealing groove 108 and the corresponding pressing surface to reduce the risk of leakage of the similar material mixture during injection, compaction, and heat-insulating pressure-maintaining static curing. Each of the outer walls of the two metal half-molds 101 is provided with a clamping part 106, which engages with the clamp 31 to keep the two metal half-molds 101 in a closed state during sample preparation. Preferably, at least two clamping parts 106 are spaced apart along the axial direction of the metal half-molds 101 to improve the stability and sealing performance after the two metal half-molds 101 are closed.

[0050] like Figure 2 As shown, the top cover 21 is used to close the upper end of the sample preparation cavity, and the base 24 is used to close the lower end of the sample preparation cavity. A spherical groove 22 is provided on the top of the top cover 21, which cooperates with the ball head 406 of the electric compactor to receive and transmit the compaction load, so that the compaction force acts on the similar material mixture along the axial direction of the sample preparation cavity. The portion of the top cover 21 extending into the sample preparation cavity is the top cover pressing boss 210, and the portion of the base 24 extending into the sample preparation cavity is the base clamping boss 240. The top cover pressing boss 210 and the base clamping boss 240 are used to compact the material within the split half-mold. Both the outer periphery of the top cover pressing boss 210 and the base clamping boss 240 are provided with annular sealing grooves 23, which are used to install O-ring seals to improve the sealing performance between the top cover 21, the base 24, and the split half-mold 1 during the compaction process. Preferably, at least two annular sealing grooves 23 are provided on the top cover 21 and the base 24 respectively to form a multi-seal structure. The lower part of the base 24 is provided with a support part 25, which is used for the operator to support the base 24 and facilitates the removal of the assembled split half mold for subsequent demolding operations after the sample is made.

[0051] like Figure 3 As shown, the top cover 21, base 24, and clamp 31 are detachably connected to the split-type half mold. The base 24 is installed at the lower end of the split-type half mold, and the clamp 31 is fitted onto the clamp mating part 106 to lock the two metal half mold bodies 101 into an assembled state. During material injection, the material injection and stirring system injects a mixture of similar materials into the sample preparation cavity through the injection port 109 located at the upper end of the metal half mold body 101. After the material injection is completed, the injection port 109 is closed by the sealing bolt 110, and then the top cover 21 is installed at the upper end of the split-type half mold, so that the sample preparation cavity is in a closed state.

[0052] In one embodiment, two metal half-molds 101 are joined to form a cylindrical sample preparation cavity. The inner diameter of the sample preparation cavity is 50 mm, the outer wall diameter of the metal half-molds 101 is 67.5 mm, and the axial height is 150 mm. The portion of the top cover 21 extending into the sample preparation cavity, i.e., the length of the top cover pressing boss 210, is 25 mm. The portion of the base 24 extending into the sample preparation cavity, i.e., the length of the base pressing boss 240, is also 25 mm. The outer diameter of the portions of the top cover 21 and the base 24 extending into the sample preparation cavity is 49.90 mm, so as to form an assembly gap with the inner wall of the sample preparation cavity and to form a sufficient compaction stroke.

[0053] Both the top cover 21 and the base 24 have a micro-chamfer at the end facing the similar material mixture to prevent the top cover 21 and the base 24 from scratching the protective coating on the inner wall of the metal half mold 101 during assembly, compaction or demolding; under this chamfer structure, the effective diameter of the end face of the top cover 21 and the base 24 that is in contact with the similar material mixture is 49.80 mm.

[0054] like Figure 2 and Figure 10 In this embodiment, after the top cover 21 and the base 24 extend into the sample preparation cavity, the top cover presses down on the boss 210 and the base presses against the boss 240 to form an effective forming area for a similar material sample. The axial height of the effective forming area is 100 mm. The injection port 109 is located in the upper region of the metal half-mold 101 and is above the effective forming area. Specifically, the injection port 109 is a lateral through hole arranged radially along the metal half-mold 101. The center distance of the injection port 109 from the upper end face of the metal half-mold 101 is 15 mm, the inner diameter of the channel of the injection port 109 is 16 mm, and the injection port 109 is located above the embedded heating device 102. After the injection is completed, the injection port 109 is closed by the sealing bolt 110. The inner end of the sealing bolt 110 does not protrude from the inner wall of the sample preparation cavity to avoid affecting the assembly of the top cover 21 and the subsequent compaction forming process.

[0055] It should be noted that the above dimensions are merely an exemplary embodiment used to illustrate the structural fit between the sample preparation chamber, top cover 21, base 24, and injection port 109, and do not limit the actual dimensions of the sample preparation chamber, top cover 21, base 24, injection port 109, or similar material specimens. In the actual sample preparation and curing process, the aperture and position of the injection port 109 can be adjusted according to the particle size, flowability, injection pressure, and specimen size of the similar material mixture; the specimen height can be determined according to the injection volume, compaction load, pressure holding state, and the heat-preserving and pressure-holding static process of the similar material mixture. After demolding, the cylindrical similar material specimen can be end-face cut, ground, or trimmed according to the test requirements to obtain a similar material specimen of the target specifications.

[0056] like Figure 4As shown, the injection mixing system includes a mixing tank 51, a mixing mechanism 57, a high-pressure gas actuator 53, an injection cylinder 54, a feeding cover 55, and a gas regulating valve 56. The mixing tank 51, for example, is a cylindrical or cuboid cylinder, used to contain similar material components or mixtures of similar materials. The mixing mechanism 57 is used to mix and homogenize the similar material components to reduce the risk of sedimentation or segregation of components such as coarse, medium, and fine quartz sand particles before injection. The injection cylinder 54 is used to contain the similar material mixture to be injected into the sample preparation cavity, and the feeding cover 55 is used to add the similar material mixture into the injection cylinder 54 and seal the injection cylinder 54. The high-pressure gas actuator 53 is used to provide gas driving force during the injection and mixing process, and the gas regulating valve 56 is used to regulate the gas pressure or gas flow rate. In the mixing and homogenization stage, the high-pressure gas actuator 53 pushes the similar material components in the injection cylinder 54 into the mixing tank 51, and the similar material components in the mixing tank 51 are mixed and homogenized by the stirring mechanism 57. In the quantitative injection stage, the similar material mixture after mixing and homogenization is transported to the injection port 109 through the injection cylinder 54 and the injection pipeline, and further enters the sample preparation cavity formed by the mating of two metal half molds 101.

[0057] The injection mixing system is connected to an external monitoring terminal 410, which is used to set injection mixing parameters and monitor the mixing and injection status of the injection mixing system. The injection mixing parameters include material type, proportion number, target injection volume, mixing time, mixing speed, injection pressure, injection rate, and / or injection time. The external monitoring terminal 410 determines or calls the target injection volume based on the target sample size, target density, and similar material proportions, and controls the injection mixing system to complete mixing homogenization and quantitative injection according to the injection mixing parameters. After injection, the injection port 109 is closed by the sealing bolt 110, and then the top cover 21 is installed on the upper end of the split-type half mold, thus sealing the sample preparation cavity.

[0058] like Figure 5 and Figure 6 As shown, the electric compactor includes a drive mechanism 401, a control module 402, a digital display screen 403, a communication interface 404, a control button group 405, a ball indenter 406, a clamp 407, a compactor base 408, and a positioning groove 409. The drive mechanism 401, for example, is a motor, used to provide compaction load for the compaction process. The control module 402 is used to control the drive mechanism 401 to drive the ball indenter 406 to move vertically. The digital display screen 403 is used to display compaction process information. The communication interface 404 is used to realize data transmission between the control module 402 and an external monitoring terminal 410. The control button group 405 is used to input control commands.

[0059] like Figure 6As shown, the ball compactor 406 is located at the lower end of the drive mechanism 401. After the electric compactor is started, the drive mechanism 401 drives the ball compactor 406 to move downwards, and the ball compactor 406 engages with the spherical groove 22 on the top cover 21 to transfer the compaction load to the top cover 21, and further act on the similar material mixture in the sample preparation chamber, so as to compact the similar material mixture into shape.

[0060] The electric compactor is equipped with a pressure detection unit and a displacement detection unit. The pressure detection unit is used to acquire axial pressure data applied by the ball indenter 406, and the displacement detection unit is used to acquire axial displacement data of the ball indenter 406 or the top cover 21. The control module 402 is connected to the external monitoring terminal 410 via the communication interface 404 and the monitoring communication cable 411, and is used to transmit the axial pressure data and axial displacement data during the compaction process to the external monitoring terminal 410. The cable assembly 105 of the split half mold is connected to the external monitoring terminal 410, and is used to transmit the temperature data and internal stress data collected by the temperature sensor 103 and the stress sensor 104 to the external monitoring terminal 410.

[0061] The external monitoring terminal 410 is connected to the injection mixing system, the split-type half mold, and the electric compactor. During the injection mixing stage, the external monitoring terminal 410 is used to set injection mixing parameters, monitor the mixing and injection status, and control the injection mixing system to complete the mixing and homogenization of similar material mixtures and quantitative injection. During the compaction, molding, and heat preservation / pressure holding curing stages, the external monitoring terminal 410 synchronously collects temperature data, internal stress data, axial pressure data, and axial displacement data, and sets target temperature, target holding pressure, heat preservation / pressure holding time, pressure safety threshold, and displacement safety threshold, generating dynamic control commands based on the collected data.

[0062] Specifically, during the compaction stage, the external monitoring terminal 410 determines the compaction state of the similar material mixture based on axial pressure data, axial displacement data, and in-mold stress data. It then adjusts the operating state of the drive mechanism 401 via the control module 402, causing the ball indenter 406 to apply a compaction load to the top cover 21. Once the sample reaches the preset pressure holding state, the external monitoring terminal 410 controls the electric compactor to enter the pressure holding state and adjusts the start / stop or heating power of the embedded heating device 102 via the cable assembly 105, ensuring the similar material sample in the sample preparation chamber reaches the preset target temperature.

[0063] During the heat preservation and pressure holding static curing stage, the external monitoring terminal 410 dynamically adjusts the embedded heating device 102 and the electric compactor based on temperature data, in-mold stress data, and axial pressure data. This ensures that the similar material sample remains static for a predetermined time under a preset target temperature and preset pressure to complete the preparation and curing process. When the temperature data, in-mold stress data, or axial pressure data deviate from the preset heat preservation and pressure holding static curing range, the external monitoring terminal 410 updates the control strategy and sends corresponding control commands to the embedded heating device 102 or the control module 402.

[0064] like Figure 7 As shown, the dynamic feedback control process of the external monitoring terminal 410 during the preparation and curing process includes: after sample preparation, curing, and debugging are completed, target parameters and safety thresholds are first set. The target parameters include target temperature, target pressure holding state, and heat and pressure holding static curing time. The safety thresholds include pressure safety threshold and displacement safety threshold. Subsequently, temperature data, in-mold stress data, axial pressure data, and axial displacement data are collected synchronously, and feedback control is performed based on the collected data to output corresponding dynamic control commands. The dynamic control commands are used to control the operating status of the embedded heating device 102 and the electric compactor to achieve temperature adjustment, compaction load adjustment, and pressure holding state adjustment during the compaction sample preparation and heat and pressure holding static curing process.

[0065] During the dynamic feedback control process, the external monitoring terminal 410 determines whether the current temperature, internal stress, axial pressure, and axial displacement meet the target parameter requirements. If the target parameter requirements are not met, the control strategy is dynamically updated based on the deviation, and the embedded heating device 102 and / or the electric compactor are continuously adjusted. If the target parameter requirements are met, the similar material sample is kept at the preset target temperature and preset pressure for a predetermined time to complete the preparation and curing. If the axial pressure data, axial displacement data, or axial pressure increment per unit displacement exceeds the corresponding safety threshold, the external monitoring terminal 410 controls the electric compactor to stop pressing and issues an alarm signal.

[0066] The axial displacement data acquired by the displacement detection unit is mainly used for compaction process control and mold safety protection. When the axial pressure data reaches the pressure safety threshold, the axial displacement data reaches the displacement safety threshold, or the axial pressure increment per unit displacement exceeds the preset threshold, the external monitoring terminal 410 sends an alarm signal and sends a stop pressing command to the control module 402. The control module 402 controls the drive mechanism 401 to stop pressing to prevent the ball pressure head 406 from continuing to push the top cover 21 and damaging the metal half mold 101, the top cover 21, or the base 24.

[0067] like Figure 5As shown, the compactor base 408 is provided with a positioning groove 409 and a clamp 407. The positioning groove 409 is used to position the assembled split half mold, and the clamp 407 is used to quickly fix the assembled split half mold onto the compactor base 408, and facilitates the disassembly and demolding of the split half mold after sample preparation. The clamp 407 is, for example, a threaded rod. This threaded rod can be inserted into the compactor base 408.

[0068] like Figure 5 and Figure 6 As shown, the clamp 407 is, for example, a threaded rod. The compactor base 408 is provided with a threaded hole for accommodating the clamp 407. The compactor base 408 is also provided with a clamp clearance groove 61 that communicates with the threaded hole for accommodating the clamp 407. The clamp clearance groove 61 is used to accommodate at least part of the structure of the clamp 407 when the clamp 407 is clamped or fastened, so that the clamp 407 is lower than or not higher than the bearing surface of the compactor base 408 after being fastened, so as to facilitate the placement and fixation of the assembled split half mold.

[0069] Based on the above-described preparation device structure, this invention can also combine a similar material proportioning method to determine the similar material proportions suitable for deep reservoir physical simulation experiments. Specifically:

[0070] In one embodiment, the proportions of similar materials for deep reservoirs are determined based on the above-described preparation apparatus. Specifically, a target deep reservoir is first identified, rock samples are obtained from the target deep reservoir, the mineral composition of the rock samples is determined, and their uniaxial compressive strength, tensile strength, porosity, and permeability are tested.

[0071] Based on the similarity ratio of the physical simulation test, the similarity parameters required for the simulation test are calculated using similarity criteria. The similarity parameters include at least one of uniaxial compressive strength, tensile strength, porosity, and permeability.

[0072] Based on the determined mineral composition and calculated similarity parameters, a similar material proportioning test scheme was designed, and multiple sets of similar material components were weighed according to different component ratios and target sample quantities. The similar material components include lime, gypsum, silicate cement, calcium carbonate, water, coarse quartz sand, medium quartz sand, and fine quartz sand.

[0073] Different proportions of similar material components are added to the injection mixing system. The corresponding injection mixing parameters are set via an external monitoring terminal, and the system is controlled to mix and homogenize the similar material components, resulting in a similar material mixture. This mixture is then quantitatively injected into the sample preparation cavity of the split-type half-mold through the injection port using the injection mixing system. After injection, the injection port is sealed with sealing bolts, and the top cover is installed on the upper end of the split-type half-mold.

[0074] Subsequently, an electric compactor was used to compact the similar material mixture within the sample preparation chamber. During compaction and static curing under heat and pressure, an embedded heating device heated the similar material mixture or sample. Temperature and stress sensors monitored the temperature and internal stress states during the curing process, and an external monitoring terminal simultaneously collected temperature, internal stress, axial pressure, and axial displacement data. The external monitoring terminal dynamically adjusted the embedded heating device and electric compactor based on the collected data, ensuring the similar material sample was held at a preset target temperature and pressure for a predetermined time. After static curing under heat and pressure, the split half-mold was disassembled and the sample was demolded, yielding the deep reservoir similar material sample.

[0075] Physical and mechanical properties of the prepared similar material samples with different proportions were tested to obtain at least one of the following test results: uniaxial compressive strength, tensile strength, porosity, and permeability. Based on the correspondence between different component proportions, injection mixing parameters, compaction and curing parameters, and test results, an empirical relationship between the component proportions of similar materials and the target physical and mechanical parameters was established. The similar material proportions and injection preparation parameters were calibrated according to the empirical relationship to obtain similar material proportions that meet the similarity requirements of the target deep reservoir.

[0076] The prepared similar material samples were subjected to physical and mechanical property tests, including at least one of uniaxial compressive strength testing, tensile strength testing, elastic modulus testing, and permeability testing. Based on the test results, regression analysis was used to obtain empirical relationships between the physical and mechanical parameters of the similar material samples and their composition. The proportioning formula for the similar materials can employ various existing empirical formulas, for example...

[0077] Using the proportion of each component to the total mass of the mixture as variables, the following empirical relationship is established:

[0078] ;

[0079] In the formula, denoted as uniaxial compressive strength of similar samples; x1, x2, x3, x4, x5, x6, x7, x8, and x9 represent the proportions of the total mass of quartz sand, lime, gypsum, cement, calcium carbonate, water, coarse quartz sand particles, medium quartz sand particles, and fine quartz sand particles to the total mass of the mixture, respectively; a1, b1, c1, d1, e1, f1, g1, h1, and i1 represent the uniaxial compressive strength of each of the above materials, and j1 is an empirical constant.

[0080] like Figure 8As shown, when preparing deep reservoir similar material samples using the above-described preparation apparatus and according to the above-described proportioning method, the following steps are included:

[0081] S1. Determining the proportions and preparing the mixture.

[0082] Based on the target physical and mechanical parameters corresponding to the target deep reservoir, the proportions of each component in the similar material are determined according to the above-mentioned proportioning method. The similar material includes lime, gypsum, silicate cement, calcium carbonate, water, coarse quartz sand, medium quartz sand, and fine quartz sand. Each component is weighed according to the determined proportions to obtain the component material or preliminary mixture to be prepared, and the target injection amount is determined based on the target sample size, target density, and similar material proportions.

[0083] S2. Mold inspection and pre-assembly.

[0084] Check the protective coating on the inner wall of the two metal half-molds 101, the temperature sensor 103, the stress sensor 104, the axial sealing strip in the linear sealing groove 108, the injection port 109, the sealing bolt 110, and the annular sealing groove 23 on the top cover 21 and the base 24 for integrity, and install O-rings in the annular sealing groove 23; at the same time, check the connection status between the cable assembly 105, the injection mixing system, the electric compactor, and the external monitoring terminal 410.

[0085] S3. Install the base and close the half mold.

[0086] Place the base 24 at the corresponding position at the lower end of the two metal half-molds 101, so that the base 24 extends into the lower end of the sample preparation cavity; then align the two metal half-molds 101 with each other along the mating surface 107, so that the axial sealing strip in the linear sealing groove 108 abuts against the corresponding pressing surface, and lock the two metal half-molds 101 by fitting the clamp 31 at the clamp mating part 106, so that the split half mold forms a closed state.

[0087] S4. Fixed mold and quantitative injection.

[0088] The closed split half mold is placed on the compactor base 408 of the electric compactor and positioned in conjunction with the positioning groove 409; then the split half mold is fixed on the compactor base 408 by the clamp 407, which is at least partially accommodated in the clamp clearance groove 61 when it is engaged.

[0089] The injection and mixing parameters are set via an external monitoring terminal 410. These parameters include material type, proportion number, target injection volume, mixing time, mixing speed, injection pressure, injection rate, and / or injection time. The injection and mixing system homogenizes similar material components or preliminary mixtures according to these parameters to obtain a similar material mixture. The homogenized similar material mixture is then quantitatively injected into the sample preparation cavity through the injection port 109. During the injection process, the top cover 21 is not yet installed on the upper end of the split-type half mold, allowing gas in the sample preparation cavity to escape from the top and reducing injection resistance.

[0090] S5. Seal the injection port and install the top cover.

[0091] Once the target injection volume of the similar material mixture is reached, injection is stopped, and the injection port 109 is sealed with sealing bolts 110 to prevent the similar material mixture from overflowing from the injection port 109 during subsequent compaction molding and heat preservation and pressure holding curing. Then, the top cover 21 is installed on the upper end of the split-type half mold, so that the top cover 21 seals the upper end of the sample preparation cavity, and a sealing fit is formed at the annular sealing groove 23 on the top cover 21.

[0092] S6, Compaction Molding and Dynamic Feedback Control.

[0093] When the electric compactor is started, the control module 402 controls the drive mechanism 401 to drive the ball head 406 to move downward, so that the ball head 406 engages with the spherical groove 22 on the top cover 21, and applies a compaction load to the similar material mixture in the sample preparation chamber through the top cover 21, so that the similar material mixture is compacted and formed.

[0094] During the compaction molding process, temperature sensor 103 and stress sensor 104 collect temperature data and in-mold stress data, respectively, and transmit them to the external monitoring terminal 410 via cable assembly 105. Simultaneously, control module 402 acquires axial pressure data and axial displacement data of the electric compactor and transmits them to the external monitoring terminal 410 via communication interface 404 and monitoring communication cable 411. The external monitoring terminal 410 generates dynamic control commands based on the temperature data, in-mold stress data, axial pressure data, and axial displacement data. It adjusts the start / stop or heating power of the embedded heating device 102 via cable assembly 105 and regulates the compaction load or pressure holding state of the electric compactor via control module 402.

[0095] When the axial pressure data reaches the pressure safety threshold, the axial displacement data reaches the displacement safety threshold, or the axial pressure increment per unit displacement exceeds the preset threshold, the external monitoring terminal 410 sends an alarm signal and sends a stop pressing command to the control module 402. The control module 402 controls the drive mechanism 401 to stop pressing to avoid the ball pressure head 406 continuing to push the top cover 21 and damaging the metal half mold 101, the top cover 21, or the base 24.

[0096] S7. In-mold heat preservation and pressure maintenance followed by static curing and demolding.

[0097] Once the similar material sample reaches the preset target temperature and preset pressure, the external monitoring terminal 410 controls the embedded heating device 102 and the electric compactor to keep the similar material sample in the sample preparation chamber at the preset target temperature and preset pressure for a predetermined time, thus completing the in-mold heat preservation and pressure static curing. During the in-mold heat preservation and pressure static curing process, if the temperature data, in-mold stress data, or axial pressure data deviate from the preset heat preservation and pressure static curing range, the external monitoring terminal 410 updates the control strategy and continues to provide feedback control.

[0098] After the in-mold heat preservation, pressure holding, and static curing are completed, the clamp 407 is released, and the split half mold is removed from the compactor base 408; then the clamp 31 is removed, the two metal half mold bodies 101 are separated, and demolding is completed with the help of the support part 25 of the base 24, resulting in a cylindrical similar material sample. The demolded similar material sample can be end-faced cut, ground, or trimmed according to the test requirements to obtain a sample of the target specifications.

[0099] Furthermore, to improve the mixing uniformity and quantitative injection during the preparation and curing of similar material samples, this invention requires cleaning the mixing tank after each injection. After mixing and injection, a pre-cleaning is performed by introducing water into the mixing tank at normal pressure to a certain depth. The stirring blades rotate in the water in the mixing tank for a few minutes, and then the outlet at the bottom of the mixing tank is opened to discharge the water and mixed material. In this invention, the injection cylinder 54 includes multiple cylinders for holding different materials, including a water cylinder 541. Water can be introduced into the mixing tank at normal pressure to the deepest depth of the mixed material, or to 2 / 3 of the mixing tank depth (generally, mixing materials does not require such a deep depth; even if the material occasionally exceeds this depth, after water enters the mixing tank, the part above 2 / 3 of the mixing tank can be soaked or fall into the water under the stirring action of the stirring blades). Pre-cleaning can remove most of the material or slurry.

[0100] In order to accurately improve the mixing uniformity and quantitative injection during the preparation and curing of similar material samples, ordinary pre-cleaning is not enough. The mixing tank and mixing blades still contain a lot of material or mud, so special additional cleaning is required.

[0101] Therefore, after pre-cleaning, the present invention designs a triple cleaning process for the mixing tank, namely, three additional cleanings. The first step is mechanical cleaning: the telescopic shaft extends to the bottom of the mixing tank, causing the bottom edge of the mixing blades to rotate on the bottom surface of the mixing tank, thereby mechanically sweeping away residual material to the outlet.

[0102] like Figure 11 As shown, the mixing tank 51 is a cylindrical or cuboid cylinder with a flat bottom surface. The mixing mechanism includes a telescopic shaft 58 that can extend and retract within the mixing tank and a mixing blade 52 connected to the telescopic shaft. During mixing, the telescopic shaft 58 and the mixing blade 52 are located in the middle of the mixing tank 51 to ensure uniform mixing of all parts within the mixing tank 51.

[0103] The rotating surface of the bottom edge of the stirring blade 52 is a plane that is flush with the bottom surface of the mixing tank, such as... Figure 11 As shown, the shape of the stirring blade 52 in the main view direction can be rectangular, and the shape of the stirring blade 52 in the top view direction can be S-shaped or other arc shape to achieve stirring and unloading functions. The first cleaning is to open the outlet 59 at the bottom of the mixing tank after stirring and filling, and to extend the telescopic shaft 58 to the bottom of the mixing tank to drive the bottom edge of the stirring blade 52 to rotate on the bottom surface of the mixing tank 51. The rotating surface of the bottom edge of the stirring blade 52 is in contact with the bottom surface of the mixing tank 51. The stirring blade 52 provides mechanical cleaning to sweep the residual material out of the outlet 59 and collect it through the collection container 590, thus achieving the first mechanical cleaning, which can remove most of the solid or paste materials in the mixing tank 51.

[0104] After removing most of the solid or paste material from the mixing tank 51, a small amount of solid or paste material remains in the mixing tank 51, and a considerable amount of solid or paste material also adheres to the mixing blades 52. At this point, the present invention performs a second cleaning with high-pressure water to remove the remaining solid or paste material from the mixing tank 51 and the mixing blades 52. In the present invention, the injection cylinder 54 includes: a water cylinder 541, and the high-pressure gas driver 53 (high-pressure air pump) is connected to the water cylinder 541 through a gas regulating valve 56 to supply high-pressure gas to the water cylinder. Figure 12 As shown, the telescopic shaft 58 and the stirring blade 52 are lifted from the bottom of the mixing tank 51 to the middle or upper part of the mixing tank 51. The stirring blade 52 rotates, and the water cylinder 541 and the high-pressure gas actuator 53 are turned on to spray high-pressure water onto the mixing tank 51 and the stirring blade 52 to clean up residual materials. In the second cleaning, although water is also supplied to the mixing tank 51, high-pressure water (e.g., 2-4 atmospheres) is supplied to the mixing tank 51, while in the pre-cleaning process, normal pressure (1-1.05 atmospheres) is supplied to the mixing tank 51. The high-pressure water spray area covers the stirring blade 52. Through the second cleaning with high-pressure water, most of the residual solid or paste materials on the mixing tank 51 and the stirring blade 52 can be removed.

[0105] After the second stage of high-pressure water cleaning removes residual solid or paste materials from the mixing tank 51 and stirring blades 52, residual water and a very small amount of residual material remain. To further clean these areas and ensure accurate sample preparation, a third stage of cleaning is performed. This third stage involves high-pressure gas purging. High-pressure gas (3-6 atmospheres, for example, 5 atmospheres) is directly blown into the mixing tank 51 by the high-pressure gas actuator 53 to remove residual material and water. This triple cleaning process completely removes any remaining material from the mixing tank, allowing for the injection of new mixing material. This prevents the mixing tank from being filled with new material again, which could lead to mixing of old and new materials, substandard composition of the injected material, and negative impacts on subsequent sample preparation.

[0106] The above-mentioned triple cleaning process includes three stages: First, mechanical cleaning, which utilizes the stirring function of the stirring blades and also leverages their additional function, achieving two goals at once; second, high-pressure water cleaning, which utilizes water as a component of the material during the injection process, participating in both the injection and post-injection cleaning, again achieving two goals at once; and third, high-pressure gas cleaning, which utilizes the high-pressure gas actuator to assist in the injection process and also provides additional cleaning after injection, again achieving two goals with one stone. These three cleaning processes, while fully utilizing the basic functions of stirring and injection, are further enhanced, achieving two uses with one device, eliminating the need for additional cleaning equipment and costs, and ensuring a tight and continuous timeline. This guarantees the smooth operation of the batching, injection, stirring, and cleaning functions, providing equipment and time guarantees for the rapid preparation and updating of similar material samples and emergency production, greatly improving production efficiency.

[0107] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. The various components of the present invention can be combined with each other without conflict. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A device for preparing and curing similar materials for deep reservoirs, characterized in that, include: A split-type half mold, comprising two mating metal halves, which, when mated, form a sample preparation cavity for accommodating a mixture of similar materials. The top cover seals the upper end of the sample preparation chamber; The base seals the lower end of the sample preparation chamber; An electric compactor is connected to the top cover; The injection and mixing system mixes similar material components and injects the mixed similar material into the sample preparation cavity in a quantitative manner according to preset injection and mixing parameters; An external monitoring terminal is connected to the injection mixing system, the split half mold, and the electric compactor, respectively.

2. The deep reservoir similar material injection preparation and curing device as described in claim 1, characterized in that, The metal half-mold is equipped with an embedded heating device, a temperature sensor and a stress sensor, and at least one of the metal half-molds has an injection port at its upper end that communicates with the sample preparation cavity. The injection port is used to inject a mixture of similar materials into the sample preparation cavity and is sealed by a sealing bolt after the injection is completed.

3. The deep reservoir similar material injection preparation and curing device as described in claim 2, characterized in that, The external monitoring terminal is used to set the injection mixing parameters and monitor the mixing homogenization state and quantitative injection state of the injection mixing system during the injection mixing stage. During the compaction molding and heat preservation and pressure holding static curing stages, it is used to dynamically feedback and control the embedded heating device and / or electric compactor based on temperature data, in-mold stress data and compaction process data, so that similar material samples can complete compaction molding and heat preservation and pressure holding static curing under preset temperature and preset pressure conditions.

4. The deep reservoir similar material injection preparation and curing device as described in claim 1, characterized in that, The injection and mixing system includes a mixing tank, a mixing mechanism, a high-pressure gas actuator, an injection cylinder, a feeding cover, and a gas regulating valve. The injection cylinder is used to contain similar material components to be mixed or injected, and the feeding cover is used to add similar material components into the injection cylinder and close the injection cylinder. The high-pressure gas actuator is used to provide gas driving force during the injection and mixing process, and the gas regulating valve is used to regulate the gas pressure or gas flow rate.

5. The deep reservoir similar material injection preparation and curing device as described in claim 4, characterized in that, The bottom surface of the mixing tank is flat. The mixing mechanism includes a telescopic shaft that can extend and retract within the mixing tank and mixing blades connected to the telescopic shaft. The rotating surface of the bottom edge of the mixing blades is a plane that is flush with the bottom surface of the mixing tank. After mixing and feeding are completed, a pre-cleaning is performed by supplying water into the mixing tank at normal pressure to a certain depth. The mixing blades rotate in the water in the mixing tank for a few minutes. Then, the outlet at the bottom of the mixing tank is opened to discharge the water and mixed materials. After the pre-cleaning, a mechanical cleaning is performed: the telescopic shaft extends to the bottom of the mixing tank, causing the bottom edge of the mixing blades to rotate on the bottom surface of the mixing tank, and the residual materials are mechanically swept out of the outlet.

6. The deep reservoir similar material injection preparation and curing device as described in claim 5, characterized in that, The injection cylinder includes a water cylinder. The high-pressure gas actuator is connected to the water cylinder and provides high-pressure gas to the water cylinder. After the first mechanical cleaning, the telescopic shaft and the stirring blade are raised, the water cylinder and the high-pressure gas actuator are opened, and high-pressure water is sprayed into the stirring tank to clean the residual materials with high-pressure water, thereby achieving a second high-pressure water cleaning.

7. The deep reservoir similar material injection preparation and curing device as described in claim 6, characterized in that, After the double high-pressure water purging, high-pressure gas is directly supplied to the mixing tank through the high-pressure gas driver to purge residual materials and residual water, thereby achieving triple high-pressure gas purging.

8. The deep reservoir similar material injection preparation and curing device as described in claim 1, characterized in that, The bottom of the top cover is provided with a top cover pressing boss that extends into and seals the sample preparation cavity. The top of the top cover is provided with a spherical groove. The spherical groove is used to cooperate with the ball head of the electric compactor to receive and transmit the compaction load, so that the compaction force acts on the similar material mixture along the axial direction of the sample preparation cavity through the top cover pressing boss.

9. A method for preparing and curing a deep reservoir similar material by injection, characterized in that, The deep reservoir similar material injection preparation and curing apparatus according to any one of claims 1 to 8, wherein the deep reservoir similar material injection preparation and curing method comprises: Proportion determination and mixture preparation; The prepared mixture of similar materials is quantitatively injected into the sample-making cavity of the split half mold through the injection port, and the sample-making cavity is then sealed. A compaction load is applied to the mixture of similar materials in the sample preparation cavity to compact and shape it. After setting the preset target temperature and preset pressure, perform in-mold heat preservation and pressure holding static curing. After the heat preservation and pressure holding static curing is completed, disassemble the split half mold and complete demolding.

10. The method for preparing and maintaining deep reservoir similar materials by injection as described in claim 9, characterized in that, The material injection and mixing system includes a mixing tank, a mixing mechanism, a high-pressure gas actuator, and a material injection cylinder; the mixing mechanism includes a telescopic shaft and mixing blades connected to the telescopic shaft; the material injection cylinder includes a water cylinder. After mixing and feeding are completed, a pre-cleaning is performed by supplying water into the mixing tank at normal pressure to a certain depth. The mixing blades rotate in the water in the mixing tank for a few minutes. Then, the outlet at the bottom of the mixing tank is opened to drain the water and mixed materials. After the pre-cleaning, the mixing tank undergoes a triple cleaning process. The first cleaning is mechanical cleaning, where a telescopic shaft extends to the bottom of the mixing tank, causing the bottom edge of the mixing blades to rotate on the bottom surface of the mixing tank, thus cleaning the residual materials out of the outlet. The second cleaning is high-pressure water cleaning, where the water tank and high-pressure gas actuator are turned on to spray high-pressure water into the mixing tank to clean the residual materials. The third cleaning is high-pressure air cleaning, where high-pressure gas is directly blown into the mixing tank through the high-pressure gas actuator to remove the residual materials and water.

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