High-temperature and high-pressure model pore network characterization system

Abstract

The invention belongs to the field of core analysis, and discloses a high-temperature and high-pressure model pore network characterization system which comprises an analysis rack and an analysis model, the analysis model comprises a model main body, an execution assembly and a main body lower pressing cap, and an upper pressing plate and a lower top plate are arranged at the upper end and the lower end of the model main body respectively; a hanging basket for placing a detection sample is arranged at the bottom end of the upper pressing plate, and a Wood alloy block is arranged at the upper end of the lower top plate. Through mutual cooperation of the model main body, the upper pressing plate, the lower top plate, the upper execution assembly, the lower execution assembly and other parts, a rock core analysis experiment is realized in a molten alloy mode, and the upper execution assembly and the lower execution assembly pressurize the rock core analysis experiment in an oil pressure mode. In this way, the alloy has higher contrast contrast with the matrix particles, the imaging effect is better, and the problem that in a traditional method, fine depiction of the pore structure in the whole pore diameter range is difficult to achieve is effectively solved.

Description

Technical Field

[0001] The invention relates to the field of core analysis, and in particular to a high-temperature and high-pressure model pore network characterization system. Background Art

[0002] In rocks, the flow and chemical migration of fluids are affected by their porosity, permeability and pore tortuosity, which are macroscopic manifestations of pore structure. Pore structure is an important influencing and controlling factor of fluid distribution, seepage characteristics, rock mechanical properties, and acoustic and electrical propagation characteristics in rocks. The scientific quantitative characterization of pore structure and the reasonable construction of different pore network models are the key and basis for exploring and revealing the intrinsic relationship between macroscopic physical properties such as rock porosity, acoustic and electrical properties, and mechanical properties and multi-scale pore structure.

[0003] Traditional core analysis is not only difficult to accurately characterize the true three-dimensional pore structure of rocks, but also time-consuming and labor-intensive, and the adjustment of pore structure parameters cannot be achieved, which cannot meet the needs of studying the physical properties of rocks with complex pore structures. In addition, due to the large number of pore types in tight reservoirs in rocks, the complex pore throat combination characteristics, and the pore size distribution ranging from a few nanometers to a few microns, the existing pore structure characterization methods can only calculate the fractal dimension of some pore throat systems, with low contrast and poor imaging effects, making it difficult to achieve a detailed characterization of the pore structure within the entire pore size range.

[0004] Therefore, a pore network characterization system is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature and high-pressure model pore network characterization system to solve the problems of low contrast, poor imaging effect and difficulty in achieving fine characterization of the pore structure within the entire pore size range in the existing technology for pore structure analysis of cores.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A high temperature and high pressure model pore network characterization system, comprising:

[0008] An analysis rack, on which an analysis table is mounted;

[0009] An analysis model, the analysis model is mounted on the analysis table, and the analysis model includes:

[0010] A model body, wherein the model body is provided with a first cavity in a vertical direction, an upper pressing plate and a lower top plate are respectively provided at the upper and lower ends of the model body, a hanging basket for placing a test sample is provided at the bottom end of the upper pressing plate, and a Wood's alloy block is provided at the upper end of the lower top plate;

[0011] An actuator assembly, the actuator assembly comprising an upper actuator assembly and a lower actuator assembly, the upper actuator assembly can drive the upper pressing plate to move into or out of the first cavity, and the lower actuator assembly can drive the lower top plate to move in the first cavity;

[0012] A main body pressing cap is arranged at the bottom end of the model main body, and the main body pressing cap can block the first cavity.

[0013] Preferably, the upper actuator assembly includes an upper cylinder, an upper plug is provided at the top end of the upper cylinder, an upper pressure cap is provided at the bottom end of the upper cylinder, an upper piston is provided in the upper cylinder along the length direction of the upper cylinder, the bottom end of the upper piston is connected to an upper piston rod, the upper piston rod is passed through the upper pressure cap and connected to the upper pressure plate, and the upper plug and the upper pressure cap are respectively provided with a first oil channel and a second oil channel that cooperate with the upper piston.

[0014] Preferably, the lower actuator assembly also includes a lower cylinder, a lower pressure cap is provided at the top end of the lower cylinder, a lower plug is provided at the bottom end of the lower cylinder, a lower piston is provided in the lower cylinder along the length direction of the lower cylinder, the top end of the lower piston is connected to a lower piston rod, the lower piston rod is passed through the lower pressure cap and is connected to the lower top plate, a third oil passage and a fourth oil passage matching the lower piston are respectively provided on the lower pressure cap and the lower plug, an inner piston is also sleeved on the outer wall of the lower piston rod, the inner piston is located between the lower top plate and the main body lower pressure cap, a fifth oil passage matching the inner piston is also provided in the lower piston rod, and a sixth oil passage matching the inner piston is provided on the main body lower pressure cap.

[0015] Preferably, the lower piston rod includes a piston rod body and a connecting rod, the piston rod body is passed through the lower pressure cap and connected to the connecting rod, the connecting rod is passed through the main body lower pressure cap and connected to the lower top plate, and the inner piston is sleeved with the outer wall of the connecting rod.

[0016] Preferably, a T-shaped slot is formed at the bottom end of the connecting rod, and a plug-in block matching the T-shaped slot is provided at the top end of the piston rod body, and the plug-in block can be inserted into the T-shaped slot.

[0017] Preferably, an upper exhaust groove is provided on the outer wall of the upper piston along the circumference of the upper piston, and a seventh oil passage connected to the upper exhaust groove is provided on the upper piston. A lower exhaust groove is provided on the outer wall of the lower piston along the circumference of the lower piston, and an eighth oil passage connected to the lower exhaust groove is provided on the lower piston.

[0018] Preferably, the high-temperature and high-pressure model pore network characterization system also includes a horizontal moving mechanism, which includes a pair of linear guide rails installed on both sides of the analysis table, a sliding plate is installed on the model body, and a slider that cooperates with the linear guide box is installed on the sliding plate. The horizontal moving mechanism can drive the model body to approach or move away from the upper actuator and the lower actuator.

[0019] Preferably, a heat insulation plate is provided between the sliding plate and the model body.

[0020] Preferably, a second cavity is provided on the outer side of the first cavity, and the inner side of the second cavity is communicated with the first cavity, the outer side of the second cavity extends out of the model main body, and a window is installed at the second cavity, the window can block the opening of the second cavity, the window is fixed to the model main body through a window cover, the window cover is mounted on the outer wall of the model main body, and an annular observation port is opened in the middle of the window cover.

[0021] Preferably, a plurality of movable rollers are installed at the bottom end of the analysis rack.

[0022] Beneficial effects of the present invention:

[0023] The high-temperature and high-pressure model pore network characterization system provided in this embodiment realizes the core analysis experiment by means of molten alloy through the mutual cooperation of the model body, the upper pressure plate, the lower top plate, the upper actuator assembly and the lower actuator assembly. The upper actuator assembly and the lower actuator assembly use oil pressure to pressurize the core analysis experiment. Compared with the general epoxy resin injection method, the alloy has a higher contrast with the matrix particles and a better imaging effect, which effectively solves the problem that it is difficult to achieve fine characterization of the pore structure in the entire pore size range in traditional methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a high temperature and high pressure model pore network characterization system provided in an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of the analysis model provided by an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of an upper cylinder provided by an embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of a lower cylinder provided in an embodiment of the present invention;

[0028] Figure 5It is a connection diagram of a core analysis experiment using a high temperature and high pressure model pore network characterization system provided in an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Analysis rack; 2. Analysis table; 3. Roller;

[0031] 4. Model body; 41. First cavity; 42. Main body lower pressure cap; 43. Upper pressure plate; 44. Lower top plate;

[0032] 5. Upper cylinder; 50. Crossbeam; 51. Upper plug; 52. Upper pressure cap; 53. Upper piston; 531. O-ring; 532. Seventh oil passage; 533. Upper exhaust groove; 54. Upper piston rod; 55. First oil passage; 56. Second oil passage; 57. Hanging basket; 58. Column; 59. Column support pipe;

[0033] 6. Lower cylinder; 61. Lower pressure cap; 62. Lower plug; 63. Lower piston; 64. Piston rod body; 65. Connecting rod; 66. Third oil passage; 67. Fourth oil passage; 68. Inner piston; 681. Fifth oil passage; 682. Sixth oil passage;

[0034] 7. Linear guide rail; 71. Sliding block; 72. Sliding plate; 73. Heat insulation board;

[0035] 8. Second cavity; 81. Window; 82. Window gland; 83. Observation port;

[0036] 101. Safety valve; 102. Pressure sensor; 103. First injection liquid; 104. First pneumatic valve; 105. First single-cylinder constant speed and constant pressure pump; 106. First non-return valve; 108. First pipeline; 109. Second pipeline; 110. Second injection liquid; 111. Second pneumatic valve; 112. Second single-cylinder constant speed and constant pressure pump; 113. Second non-return valve; 114. Vacuum pump; 115. Vacuum container; 116. Third pneumatic valve; 117. Third pipeline. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figures 1 to 5 As shown, this embodiment provides a high-temperature and high-pressure model pore network characterization system, including: an analysis rack 1 and an analysis model, an analysis table 2 is installed on the analysis rack 1, and the analysis model is installed on the analysis table 2. The analysis model includes a model body 4, an execution assembly, and a body press cap 42. Further, the model body 4 is provided with a first cavity 41 in the vertical direction, and an upper pressing plate 43 and a lower top plate 44 are respectively provided at the upper and lower ends of the model body 4. A hanging basket 57 for placing a test sample is provided at the bottom end of the upper pressing plate 43, and a Wood's alloy block is provided at the upper end of the lower top plate 44; the execution assembly includes an upper execution assembly and a lower execution assembly, and the upper execution assembly can drive the upper pressing plate 43 to move into or out of the first cavity 41, and the lower execution assembly can drive the lower top plate 44 to move in the first cavity 41; the body press cap 42 is provided at the bottom end of the model body 4, and the body press cap 42 can block the first cavity 41.

[0042] The high-temperature and high-pressure model pore network characterization system provided in this embodiment realizes the core analysis experiment by means of molten alloy through the mutual cooperation of the model body 4, the upper pressure plate 43, the lower top plate 44, the upper actuator and the lower actuator. The upper actuator and the lower actuator use oil pressure to pressurize the core analysis experiment. Compared with the general epoxy resin injection method, the alloy has a higher contrast with the matrix particles and a better imaging effect, which effectively solves the problem that it is difficult to achieve fine characterization of the pore structure in the entire pore size range in traditional methods.

[0043] Alternatively, if Figures 1 to 4 As shown, the analysis frame 1 is a hollow rectangular frame structure, and the analysis table 2 is a rectangular plate. Furthermore, the model body 4 in this embodiment is in a T-shape, and a flexible electric heating sleeve is also mounted on the outside of the model body 4. The first cavity 41 passes through the model body 4 in the vertical direction, and the main body down-pressing cap 42 arranged at the bottom end of the model body 4 is used to seal the bottom end of the first cavity 41; the main body down-pressing cap 42 and the model body 4 are connected and fixed by threads. Furthermore, the upper pressing plate 43 is in an inverted T-shape, and an O-ring 531 is also mounted on the outer wall of the upper pressing plate 43, so that after the upper pressing plate 43 is moved into the first cavity 41, the sealing between the upper pressing plate 43 and the model body 4 can be achieved, which provides a basis for the smooth progress of subsequent core analysis. Furthermore, the lower top plate 44 in this embodiment is placed in the first cavity 41 , and a sealing ring is provided between the lower top plate 44 and the inner wall of the model body 4 , so as to ensure the sealing between the lower top plate 44 and the model body 4 .

[0044] Alternatively, if Figure 1 As shown, a plurality of movable rollers 3 are installed at the bottom of the analysis rack 1 to realize the movement of the analysis rack 1. Specifically, the movable rollers 3 in this embodiment are Foma wheels, which have good load-bearing properties, are strong and durable, and are convenient for the movement of the entire analysis rack 1 and are relatively labor-saving.

[0045] Alternatively, if Figure 2 and Figure 3As shown, the upper actuator assembly includes an upper cylinder 5, an upper plug 51 is provided at the top of the upper cylinder 5, an upper pressure cap 52 is provided at the bottom of the upper cylinder 5, an upper piston 53 is provided in the upper cylinder 5 along the length direction of the upper cylinder 5, and an upper piston rod 54 is connected to the bottom end of the upper piston 53, the upper piston rod 54 is passed through the upper pressure cap 52 and connected to the upper pressure plate 43, and a first oil passage 55 and a second oil passage 56 matching the upper piston 53 are respectively provided on the upper plug 51 and the upper pressure cap 52. Specifically, the upper cylinder 5 in this embodiment is a hollow container with openings at both ends, the upper plug 51 is provided at the upper end opening of the upper cylinder 5, and the upper pressure cap 52 is provided at the lower end opening of the upper cylinder 5. The upper plug 51 and the upper pressure cap 52 are both fixed to the upper cylinder 5 by threads. The first oil passage 55 and the second oil passage 56 are oil inlet and outlet ports for each other. The upper piston 53 can move up and down by injecting oil into the inner cavity of the upper cylinder 5. Moreover, the upper piston 53 can adjust the pressure applied to the upper pressure plate 43 through the upper piston rod 54.

[0046] Alternatively, if Figure 1 As shown, in this embodiment, a column 58 for fixing the upper cylinder 5 is also connected to the analysis rack 1, and a column support tube 59 is also provided on the analysis rack 1. The bottom end of the column support tube 59 is fixed to the bottom end of the analysis rack 1, and the top end of the column support tube 59 is fixed to the bottom end surface of the analysis table 2. The column support tube 59 has a through hole for inserting and installing the column 58. The top end of each column 58 is connected to a crossbeam 50, and the top end of the upper cylinder 5 is fixed on the crossbeam 50.

[0047] Alternatively, if Figure 3 As shown, an upper exhaust groove 533 is provided on the outer wall of the upper piston 53 along the circumference of the upper piston 53, and a seventh oil passage 532 connected to the upper exhaust groove 533 is provided on the upper piston 53. A lower exhaust groove is provided on the outer wall of the lower piston 63 along the circumference of the lower piston 63, and an eighth oil passage connected to the lower exhaust groove is provided on the lower piston 63.

[0048] like Figure 3 As shown, in this embodiment, O-rings 531 are installed on the upper and lower sides of the circumferential outer wall of the upper piston 53, respectively. Specifically, the upper exhaust groove 533 is arranged between the circumferential outer wall of the upper piston 53 and the O-ring 531, and the shape of the upper exhaust groove 533 is annular. One side of the seventh oil passage 532 in this embodiment is connected to the upper exhaust groove 533, and the other side is connected to the inner cavity of the upper cylinder 5.

[0049] It is understandable that in order to ensure the seal between the upper piston 53 and the upper cylinder 5, an O-ring 531 for sealing is added to the upper piston 53. Due to the presence of the O-ring 531, in order to ensure the smooth installation of the upper piston 53, an upper exhaust groove 533 is provided on the upper piston 53 for exhausting gas, so as to avoid the presence of gas between the upper piston 53 and the upper cylinder 5 due to the presence of two O-rings 531 when the upper piston 53 is installed, thereby affecting the smooth up and down movement of the upper piston 53. The design of the seventh oil passage 532 is to use oil to exhaust the gas in the upper exhaust groove 533 during subsequent use, so as to avoid the gas from being retained in the upper exhaust groove 533.

[0050] Alternatively, if Figure 2 and Figure 4 As shown, the lower actuator assembly also includes a lower cylinder 6, a lower pressure cap 61 is provided at the top end of the lower cylinder 6, a lower plug 62 is provided at the bottom end of the lower cylinder 6, a lower piston 63 is provided in the lower cylinder 6 along the length direction of the lower cylinder 6, the top end of the lower piston 63 is connected to a lower piston rod, the lower piston rod is penetrated by the lower pressure cap 61 and is connected to the lower top plate 44, a third oil passage 66 and a fourth oil passage 67 matching the lower piston 63 are respectively provided on the lower pressure cap 61 and the lower plug 62, an inner piston 68 is also sleeved on the outer wall of the lower piston rod, the inner piston 68 is located between the lower top plate 44 and the main body lower pressure cap 42, a fifth oil passage 681 matching the inner piston 68 is also provided in the lower piston rod, and a sixth oil passage 682 matching the inner piston 68 is provided on the main body lower pressure cap 42.

[0051] like Figure 2 and Figure 4 As shown, in this embodiment, the lower cylinder 6 is a hollow container with openings at both ends, the lower pressure cap 61 is arranged at the upper opening of the lower cylinder 6, and the lower plug 62 is arranged at the lower opening of the lower cylinder 6. The lower pressure cap 61 and the lower plug 62 are fixed to the lower cylinder 6 by threads. Further, the lower piston rod includes a piston rod body 64 and a connecting rod 65, the piston rod body 64 is penetrated by the lower pressure cap 61 and connected to the connecting rod 65, the connecting rod 65 is penetrated by the main body lower pressure cap 42 and connected to the lower top plate 44, and the inner piston 68 is sleeved with the outer wall of the connecting rod 65. A sealing ring is also arranged between the inner piston 68 and the model body 4 to improve the sealing between the inner piston 68 and the model body 4.

[0052] like Figure 2As shown, in this embodiment, an opening of the fifth oil passage 681 extends into the lower top plate 44 and extends from the bottom end of the lower top plate 44, that is, the opening of the fifth oil passage 681 is located above the inner piston 68; an opening of the sixth oil passage 682 extends from the top end of the main body pressing cap 42 and communicates with the inner cavity of the model main body 4, that is, the opening of the sixth oil passage 682 is located below the inner piston 68, and the inner piston 68 is moved up and down by oil through the cooperation of the fifth oil passage 681 and the sixth oil passage 682. The design of the lower exhaust groove and the eighth oil passage is the same as the design principle of the upper exhaust groove 533 and the seventh oil passage 532 on the upper piston 53, and this part of the structure of the lower piston 63 will not be described in detail here.

[0053] It is understandable that the actuator in this embodiment includes an upper actuator and a lower actuator. The design of the upper actuator and the lower actuator uses oil pressure to pressurize the core analysis experiment, which can meet the high pressure requirements in the experiment. In addition, the design of the inner piston 68 and the fifth oil passage 681 and the sixth oil passage 682 is to cooperate with the lower top plate 44 through the inner piston 68, and to pressurize the lower top plate 44 through the inner piston 68, so as to further realize the adjustable pressure and facilitate the smooth progress of the analysis experiment.

[0054] Alternatively, if Figure 1 and Figure 2 As shown, the high temperature and high pressure model pore network characterization system also includes a horizontal moving mechanism, which includes a pair of linear guide rails 7 installed on both sides of the analysis table 2, a sliding plate 72 is installed on the model body 4, and a slider 71 matched with the linear guide rail 7 is installed on the sliding plate 72. The horizontal moving mechanism can drive the model body 4 to approach or move away from the upper actuator and the lower actuator. The design of the horizontal moving mechanism adopts the cooperation of components such as the linear guide rail 7, the sliding plate 72, and the slider 71 to realize the horizontal movement of the model body 4, which is convenient for the model body 4 to be separated from the upper actuator and the lower actuator, and is also convenient for cleaning the model body 4 and recovering the Wood's alloy block. In this embodiment, when performing horizontal movement, the model body 4 can be manually pushed by humans to realize the horizontal movement of the model body 4 along the linear guide rail 7, and an oil cylinder can also be installed to realize the automatic horizontal movement of the model body 4.

[0055] Alternatively, if Figure 2 As shown, a heat insulation board 73 is provided between the sliding plate 72 and the model body 4. The heat insulation board 73 provides heat insulation between the sliding plate 72 and the model body 4, so as to avoid the adverse effect of the model body 4 on the sliding plate 72 due to excessive temperature during core analysis, thereby reducing the effect of high temperature on the sliding plate 72 through the heat insulation board 73.

[0056] Optionally, in order to ensure that the model body 4 can move horizontally smoothly, the piston rod body 64 and the connecting rod 65 are connected by plugging. Figure 1 and Figure 4 As shown, a T-shaped slot is provided at the bottom of the connecting rod 65, and a plug-in block matching the T-shaped slot is provided at the top of the piston rod body 64. The connection between the piston rod body 64 and the connecting rod 65 is realized by inserting the plug-in block into the T-shaped slot. When the model body 4 needs to move horizontally, the upper pressing plate 43 is moved out of the model body 4 under the pulling action of the upper piston rod, thereby realizing the separation of the upper actuator assembly from the model body 4. Then, the piston rod body 64 is manually pulled to separate the plug-in block from the T-shaped slot, thereby realizing the separation between the piston rod body 64 and the connecting rod 65, and finally realizing the separation between the lower actuator assembly and the model body 4. At this time, the model body 4 can smoothly move horizontally along the linear guide rail 7 without interference from the upper actuator assembly and the lower actuator assembly.

[0057] Optionally, a second cavity 8 is provided on the outside of the first cavity 41, and the inside of the second cavity 8 is connected to the first cavity 41, the outside of the second cavity 8 extends out of the model body 4, a window 81 is installed at the second cavity 8, the window 81 can block the opening of the second cavity 8, the window 81 is fixed to the model body 4 through a window gland 82, the window gland 82 is mounted on the outer wall of the model body 4, and a ring-shaped observation port 83 is opened in the middle of the window gland 82. Specifically, the window 81 in this embodiment is sapphire glass, the outside of the second cavity 8 is sealed through the window 81, the window 81 is fixed to the model body 4 through the window gland 82, the window gland 82 is mounted on the outer wall of the model body 4, and the upper and lower sides of the window gland 82 are fixed to the model body 4 through screws, and a ring-shaped observation port 83 is also opened in the middle of the window gland 82. The design of the second cavity 8, the window 81, the window cover 82 and the observation port 83 in the model body 4 is to facilitate the experimenters to better observe the state of the core sample during the core analysis experiment, so as to better understand the experimental process.

[0058] like Figure 5 As shown, when conducting a core analysis experiment, it is necessary to first connect other accessories to the high temperature and high pressure model pore network characterization system of the present invention. Specifically, a safety valve 101 and a pressure sensor 102 are installed on the model body 4, and the flexible electric heating sleeve is connected to a heating power source.

[0059] The first oil channel 55 and the second oil channel 56 need to be connected to the first injection liquid 103 through different first pipelines 108 respectively. The first pneumatic valve 104, the first single-cylinder constant speed and constant pressure pump 105 and the first one-way valve 106 are also installed on the first pipeline 108. There are multiple first pneumatic valves 104.

[0060] The third oil channel 66, the fourth oil channel 67, the fifth oil channel 681 and the sixth oil channel 682 are respectively connected to the second injection liquid 110 through different second pipelines 109. A second pneumatic valve 111, a second single-cylinder constant speed and constant pressure pump 112 and a second one-way valve 113 are also installed on the second pipeline 109. There are multiple second pneumatic valves 111.

[0061] A vacuum pipe is also provided on the upper piston rod 54. One side opening of the vacuum pipe extends to the upper pressing plate 43 and extends out from the bottom end of the upper pressing plate 43, so as to vacuum the first cavity 41 of the model body 4. The other side opening of the vacuum pipe is connected to the vacuum pump 114 through a third pipe 117, and a vacuum container 115 and a third pneumatic valve 116 are also connected to the third pipe 117.

[0062] The heating power supply, the first pneumatic valve 104, the first single-cylinder constant speed and constant pressure pump 105, the first one-way valve 106, the second pneumatic valve 111, the second single-cylinder constant speed and constant pressure pump 112, the second one-way valve 113, the vacuum pump 114 and the third pneumatic valve 116 are all connected to the main power supply of the control box and are powered by the main power supply of the control box.

[0063] After the above components are connected, the operator turns on the main power of the control box, and turns on the power of the first single-cylinder constant speed and constant pressure pump 105 and the second single-cylinder constant speed and constant pressure pump 112, and turns on the heating power at the same time, and sets the heating temperature according to the core analysis experiment temperature requirements.

[0064] Fill the water tanks of the first single-cylinder constant speed and constant pressure pump 105 and the second single-cylinder constant speed and constant pressure pump 112 with water, open the suction valve, retract the pump to absorb liquid, retract the pump to the very end and then advance the pump to exhaust the air in the pump chamber until there are no bubbles in the water tank, then close the suction valve, open the discharge valve, lift the upper piston 53 to the highest operating position through the first single-cylinder constant speed and constant pressure pump 105, and lift the lower piston 63 to the highest operating position through the second single-cylinder constant speed and constant pressure pump 112.

[0065] The core sample to be analyzed is placed in the hanging basket 57, a solid Wood's alloy block is placed in the model body 4, and the Wood's alloy block is placed on the lower top plate 44, and the solid Wood's alloy block is heated into liquid by a flexible electric heating sleeve.

[0066] The first single-cylinder constant speed and constant pressure pump 105 works to inject oil into the upper cylinder 5, causing the upper piston 53 to descend. The descent of the upper piston 53 drives the upper piston rod 54 to move downward, and drives the upper pressure plate 43 downward, thereby sending the hanging basket 57 into the model body 4, until a seal is formed between the upper pressure plate 43 and the model body 4, and the upper piston 53 stops descending.

[0067] The vacuum pump 114 is turned on to evacuate the interior of the model body 4. During the evacuation, the pressure sensor 102 monitors the pressure inside the model body 4 in real time until the pressure inside the model body 4 drops to the experimental requirement, and then the vacuum pump 114 stops working.

[0068] At the beginning of the experiment, the first single-cylinder constant speed and constant pressure pump 105 and the second single-cylinder constant speed and constant pressure pump 112 work simultaneously, driving the upper piston 53 downward and the lower piston 63 upward respectively, so that the upper pressure plate 43 and the lower top plate 44 apply pressure at the same time, and then inject liquid Wood's metal into the core sample, and record the experimental data.

[0069] After the experiment, under high temperature, the lower cylinder 6 discharges the liquid, and the lower piston 63 descends, driving the liquid Wood's metal downward, so that the liquid Wood's metal is separated from the core sample for reuse. If the Wood's metal needs to be used again, the operator only needs to heat the Wood's metal block to liquid again, and then push the lower piston 63 through the lower cylinder 6 to push the liquid upward again.

[0070] After the experiment is over and the liquid Wood's alloy is cooled to room temperature, it turns into a solid state, and the upper piston 53 moves upward to take out the core sample in the hanging basket 57.

[0071] After the experiment, if the Wood's alloy is no longer needed, the solid Wood's alloy block can be heated to liquid state, and the liquid Wood's alloy can be discharged from the lower piston rod by pushing the upper piston 53 downward and the self-weight of the Wood's alloy.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A high temperature and high pressure model pore network characterization system, characterized in that: include: An analysis rack (1), wherein an analysis platform (2) is mounted on the analysis rack (1); An analysis model, the analysis model being mounted on the analysis platform (2), the analysis model comprising: A model body (4), wherein the model body (4) is provided with a first cavity (41) in a vertical direction, an upper pressing plate (43) and a lower top plate (44) are respectively provided at the upper and lower ends of the model body (4), a hanging basket (57) for placing a test sample is provided at the bottom end of the upper pressing plate (43), and a Wood's alloy block is provided at the upper end of the lower top plate (44); an actuator assembly, the actuator assembly comprising an upper actuator assembly and a lower actuator assembly, the upper actuator assembly being capable of driving the upper pressing plate (43) to move into or out of the first cavity (41), and the lower actuator assembly being capable of driving the lower top plate (44) to move within the first cavity (41); A main body pressing cap (42), wherein the main body pressing cap (42) is arranged at the bottom end of the model main body (4), and the main body pressing cap (42) can seal the first cavity (41).

2. The high temperature and high pressure model pore network characterization system according to claim 1, characterized in that: The upper actuator assembly comprises an upper cylinder (5), the top end of the upper cylinder (5) is provided with an upper plug (51), the bottom end of the upper cylinder (5) is provided with an upper pressure cap (52), an upper piston (53) is provided in the upper cylinder (5) along the length direction of the upper cylinder (5), the bottom end of the upper piston (53) is connected with an upper piston rod (54), the upper piston rod (54) is passed through the upper pressure cap (52) and is connected to the upper pressure plate (43), and a first oil passage (55) and a second oil passage (56) which cooperate with the upper piston (53) are respectively provided on the upper plug (51) and the upper pressure cap (52).

3. The high temperature and high pressure model pore network characterization system according to claim 2, characterized in that: The lower actuator assembly also includes a lower cylinder (6), the top end of the lower cylinder (6) is provided with a lower pressure cap (61), the bottom end of the lower cylinder (6) is provided with a lower plug (62), along the length direction of the lower cylinder (6), a lower piston (63) is provided in the lower cylinder (6), the top end of the lower piston (63) is connected to a lower piston rod, the lower piston rod is passed through the lower pressure cap (61) and is connected to the lower top plate (44), the lower pressure cap (61) and the lower plug (62) are A third oil passage (66) and a fourth oil passage (67) are respectively provided on the lower piston (63), and an inner piston (68) is also sleeved on the outer wall of the lower piston rod. The inner piston (68) is located between the lower top plate (44) and the main body pressing cap (42). A fifth oil passage (681) is also provided in the lower piston rod to cooperate with the inner piston (68), and a sixth oil passage (682) is provided on the main body pressing cap (42) to cooperate with the inner piston (68).

4. The high temperature and high pressure model pore network characterization system according to claim 3, characterized in that: The lower piston rod comprises a piston rod body (64) and a connecting rod (65); the piston rod body (64) is passed through the lower pressure cap (61) and connected to the connecting rod (65); the connecting rod (65) is passed through the main body lower pressure cap (42) and connected to the lower top plate (44); the inner piston (68) is sleeved with the outer wall of the connecting rod (65).

5. The high temperature and high pressure model pore network characterization system according to claim 4, characterized in that: The bottom end of the connecting rod (65) is provided with a T-shaped inserting groove, and the top end of the piston rod body (64) is provided with an inserting block matching with the T-shaped inserting groove, and the inserting block can be inserted into the T-shaped inserting groove.

6. The high temperature and high pressure model pore network characterization system according to claim 3, characterized in that: An upper exhaust groove (533) is also provided on the outer wall of the upper piston (53) along the circumference of the upper piston (53), and a seventh oil passage (532) connected to the upper exhaust groove (533) is provided on the upper piston (53). A lower exhaust groove is provided on the outer wall of the lower piston (63) along the circumference of the lower piston (63), and an eighth oil passage connected to the lower exhaust groove is provided on the lower piston (63).

7. The high temperature and high pressure model pore network characterization system according to claim 1, characterized in that: The high-temperature and high-pressure model pore network characterization system also includes a horizontal moving mechanism, which includes a pair of linear guide rails (7) installed on both sides of the analysis table (2), a sliding plate (72) is installed on the model body (4), and a slider (71) matching the linear guide rails (7) is installed on the sliding plate (72), and the horizontal moving mechanism can drive the model body (4) to approach or move away from the upper actuator and the lower actuator.

8. The high temperature and high pressure model pore network characterization system according to claim 7, characterized in that: A heat insulation plate (73) is provided between the sliding plate (72) and the model body (4).

9. The high temperature and high pressure model pore network characterization system according to claim 1, characterized in that: A second cavity (8) is arranged on the outer side of the first cavity (41), and the inner side of the second cavity (8) is connected to the first cavity (41); the outer side of the second cavity (8) extends out of the model body (4); a window (81) is installed at the second cavity (8); the window (81) can block the opening of the second cavity (8); the window (81) is fixed to the model body (4) through a window pressure cover (82); the window pressure cover (82) is mounted on the outer wall of the model body (4); and an annular observation port (83) is provided in the middle of the window pressure cover (82).

10. The high temperature and high pressure model pore network characterization system according to any one of claims 1 to 9, characterized in that: A plurality of movable rollers (3) are installed at the bottom end of the analysis rack (1).

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