A method and device for measuring oil reservoir porosity

Abstract

The present invention relates to the technical field of porosity measuring devices, and specifically discloses a reservoir porosity measuring method and device, comprising a workbench, wherein an L-shaped mounting plate is fixedly mounted at the rear end edge of the upper end surface of the workbench, and a rack rod is slidably mounted on the upper front end of the L-shaped mounting plate; a sample body is arranged below the upper sealing disk; the initial mass of the sample body can be measured under the action of a weighing device, and then the sample body can be put into a dry state under the action of a subsequent evaporation chamber shell, at which time the mass of the dried sample body can be obtained under the action of the weighing device, and then the sample body can be immersed in the interior of a water tank under the action of structures such as a rack rod, a water pump, and a support rod, and then the weight of the sample body at this time can be obtained through the action of the weighing device, and then the right-side porosity inside the sample body can be calculated using a formula.

Description

Technical Field

[0001] The present invention relates to the technical field of porosity measurement devices, and in particular to a method and device for measuring oil reservoir porosity. Background Art

[0002] Geological cores are one of the important data for underground oil reservoir research. The existing methods for measuring core porosity mainly include core surface volume, pore volume and solid volume. Core scanning method is a method for measuring porosity through surface volume.

[0003] Core scanners are essential equipment for geologists to collect images, analyze data, and properly store precious geological cores. Scanning cores reveals porosity, which can be used to analyze permeability. Porosity and permeability, combined, can be used to determine the fundamental condition of a reservoir.

[0004] Currently, most reservoir porosity measurements on the market require the use of high-precision scanning devices, which results in a long wait during the measurement process. This is because the scanning process takes a long time and therefore consumes a lot of time.

[0005] Therefore, in order to save time and improve measurement efficiency, we propose a reservoir porosity measurement method and device. Summary of the Invention

[0006] The purpose of the present invention is to provide a method and device for measuring oil reservoir porosity to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a method and apparatus for measuring reservoir porosity, comprising a workbench, an L-shaped mounting plate fixedly mounted at the rear end edge of the upper end surface of the workbench, and a rack rod slidably mounted at the upper front end of the L-shaped mounting plate;

[0008] The lower end of the rack rod is located on the inner side of the L-shaped mounting plate and is fixedly mounted with an upper sealing disk;

[0009] A sample body is provided below the upper sealing disk;

[0010] A support plate is placed at the lower end of the sample body, and a ring array of weight-measuring springs are evenly fixedly installed at the lower end of the support plate, and a weighing device is fixedly provided at the lower end of the weight-measuring spring;

[0011] A water tank is fixedly installed on the upper end surface of the workbench below the weighing device, and the sample body can slide into the interior of the water tank.

[0012] Preferably, support legs are symmetrically fixed on the left and right sides of the lower end surface of the workbench, and the support legs are used to keep the workbench away from the ground. A through hole with a circular structure is opened from the upper end to the inner side surface of the L-shaped mounting plate, and the rack rod is slidably installed inside the through hole.

[0013] Preferably, a symmetrical first motor is fixedly mounted on the upper end surface of the L-shaped mounting plate, and a first gear is fixedly mounted on the output shaft of the first motor. The first gears are engaged with the rack rod, and the first gear can drive the rack rod to slide up and down inside the through hole.

[0014] Preferably, a water pump is fixedly mounted on the upper end surface of the upper sealing disk, a U-shaped water pipe is fixedly mounted on the upper end of the water pump, and a water pipe of the same structure is also fixedly mounted from the lower end of the water pump to the outer side of the lower end of the upper sealing disk.

[0015] Preferably, a second motor is fixedly installed on both the left and right sides of the upper end of the L-shaped mounting plate, a first rotating rod is fixedly installed on the output shaft of the second motor, a second rotating rod is fixedly installed on the outer side of an end of the first rotating rod away from the second motor, an evaporation chamber shell is fixedly installed on an end of the second rotating rod away from the first rotating rod, and the evaporation chamber shell can be combined into a cylindrical structure.

[0016] Preferably, a third motor is provided under the workbench, a main gear is fixedly mounted on the output shaft of the third motor, and sub-gears are evenly arranged in a circular array under the workbench. There are four sub-gears, and all of the sub-gears are engaged with the main gear on the inside.

[0017] Preferably, a reciprocating screw is fixedly installed at the center position of the upper end surface of the sub-gear, the upper end of the reciprocating screw passes through the workbench and extends to the inside of the water tank, a second slide groove is opened in a circular array on the inner circumferential surface of the water tank, and the reciprocating screw is rotatably installed inside the second slide groove.

[0018] Preferably, a first slide is rotatably installed on the circumferential surface of the reciprocating screw, the first slide is slidably installed inside the second slide, and a support rod is rotatably installed on one end of the first slide located on the outer side of the second slide, and the support rod is rotatably connected to the lower end face of the weighing device at one end away from the first slide.

[0019] Preferably, the upper end surface of the support plate is evenly provided with a first slide groove in an annular array, an adjusting screw is rotatably installed from the inside to the outside of the first slide groove, a fixed arc plate is threadedly installed on the circumferential surface of the adjusting screw, the fixed arc plate is slidably installed in the inside of the first slide groove, and the inner wall can fit the outer side surface of the sample, and a drainage hole is provided between two adjacent first slide grooves from the upper end surface to the lower end surface of the support plate.

[0020] A method for measuring reservoir porosity comprises the following steps:

[0021] Step 1: Place the sample body on the upper end surface of the support plate, rotate the adjusting screw, fix the arc plate 26 to fix the sample body, and measure the current mass of the sample body through the weighing device;

[0022] Step 2: Start the second motor. The output shaft of the second motor drives the first rotating rod to rotate. The first rotating rod drives the second rotating rod to rotate. The second rotating rod drives the evaporation chamber shell to rotate synchronously. The evaporation chamber shell wraps the sample body and dries the sample body.

[0023] Step 3: The second motor operates in the reverse direction, moving the evaporation chamber shell away from the sample body. The first motor is started, and the first motor drives the first gear to rotate. The first gear drives the rack rod to descend, and the rack rod drives the lower end surface of the upper sealing plate to fit the upper end surface of the sample body.

[0024] Step 4: Start the third motor. The output shaft of the third motor drives the main gear to rotate. The main gear drives the sub-gear to rotate. The sub-gear drives the reciprocating screw to rotate. When the reciprocating screw rotates, the first slide slides inside the second slide groove. The first slide drives the support rod downward.

[0025] Step 5: The support rod moves downward, which will cause the weighing device to move synchronously. The weighing device will move with the weighing spring, the weighing spring will move with the support plate, and the support plate will move with the sample body. At this time, the rack rod will move downward synchronously.

[0026] Step 6: Start the water pump, which will inject water into the sample body through the water pipe, so that the sample body will float out of the water tank and the water will flow out of the drain hole on the support plate. At this time, the sample body will be weighed by the weighing device.

[0027] Step 7: Calculate the porosity of the sample using the following formula:

[0028] (1) Measure and calculate the different masses of the sample body 27, the mass of the sample after drying is M1, and the mass of the sample after saturation with water is M2;

[0029] (2) The mass difference is the mass of water in the pores. The mass formula is as follows:

[0030] ;

[0031] (3) Calculation of pore volume:

[0032] ;

[0033] Where V is the pore volume, For water quality, is the density of water;

[0034] (4) Porosity calculation formula:

[0035] ;

[0036] R is the porosity, V is the pore volume, and S is the sample volume.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention can measure the initial mass of the sample body under the action of a weighing device, and then the sample body can be placed in a dry state under the action of a subsequent evaporation chamber shell. At this time, the mass of the dried sample body can be obtained under the action of the weighing device. Then, under the action of structures such as a rack rod, a water pump, and a support rod, the sample body can be immersed in the interior of a water tank. Then, the weight of the sample body at this time can be obtained under the action of the weighing device, and the right-side porosity inside the sample body can be calculated using a formula.

[0039] 2. This invention, through the interaction of a weight-measuring spring and a rack rod, enables mass measurement of the sample body under different conditions. This dynamic measurement method is more accurate than traditional static measurement and can more realistically reflect the physical properties of the sample body. Furthermore, the coordination of a water pump and a water tank allows the sample body to be conveniently immersed in water, thus simulating the actual conditions in an oil reservoir and improving measurement accuracy and practicality.

[0040] 3. The device of the present invention boasts a compact structure and simple operation, significantly improving measurement efficiency and reducing measurement costs, providing a new solution for reservoir porosity measurement. Furthermore, the device's rational design and tight connections between its components ensure stable and reliable measurements. By optimizing the layout and coordination of its components, the entire device operates more smoothly, reducing failure rates and maintenance costs. Furthermore, the device also boasts a high degree of automation, minimizing manual errors and improving measurement accuracy and repeatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 It is the main structure diagram of the present invention;

[0043] Figure 2This is a structural diagram of the workbench and L-shaped mounting plate of the present invention;

[0044] Figure 3 It is a front view of the present invention;

[0045] Figure 4 This is a structural diagram of the rack rod and the first gear of the present invention;

[0046] Figure 5 A bottom view of the present invention;

[0047] Figure 6 It is a schematic diagram of the water tank and sample body of the present invention;

[0048] Figure 7 This is a structural diagram of the support plate of the present invention;

[0049] Figure 8 Schematic diagram of the main gear and sub gear of the present invention.

[0050] Description of reference numerals:

[0051] 1. Workbench; 2. Support legs; 3. L-shaped mounting plate; 301, through hole; 4. First motor; 5. First gear; 6. Rack rod; 7. Upper sealing plate; 8. Water pump; 9. Water pipe;

[0052] 10. Second motor; 11. First rotating rod; 12. Second rotating rod; 13. Evaporation chamber shell; 14. Third motor; 15. Main gear; 16. Sub-gear; 17. Reciprocating screw; 18. First slide; 19. Support rod;

[0053] 20. Weighing device; 21. Weighing spring; 22. Support plate; 23. Drain hole; 24. First chute; 25. Adjusting screw; 26. Fixed arc plate; 27. Sample body; 28. Water tank; 281. Second chute. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] See also Figures 1 to 8 , the present invention provides a technical solution:

[0056] A reservoir porosity measurement method and device includes a workbench 1, with support legs 2 symmetrically fixedly installed on the left and right sides of the lower end surface of the workbench 1. Under the action of the support legs 2, the workbench 1 can be kept away from the ground. Secondly, a vertical L-shaped mounting plate 3 is fixedly installed at the rear edge of the upper end surface of the workbench 1. It should be noted that the top of the L-shaped mounting plate 3 is protruding forward, such as Figure 1 shown.

[0057] Furthermore, a through hole 301 of a circular structure is provided at the center of the top front end of the L-shaped mounting plate 3, extending from the upper end surface to the lower end surface. A first motor 4 is fixedly mounted symmetrically at the edge of the through hole 301 on the top of the L-shaped mounting plate 3, and a first gear 5 is fixedly mounted on the output shaft of the first motor 4. Figure 3 shown.

[0058] A first gear 5 is slidably installed inside the through hole 301, and the first gears 5 on the left and right sides are in a state of mutual meshing. Therefore, during use, the first motor 4 is started, and the output shaft of the first motor 4 rotates with the first gear 5. During the rotation, the first gear 5 can drive the rack rod 6 to slide inside the through hole 301, thereby changing the height of the subsequent rack rod 6.

[0059] An upper sealing disc 7 with a circular structure is fixedly mounted on the lower end of the rack rod 6 , and the upper sealing disc 7 can move up and down along with the movement of the rack rod 6 .

[0060] The second motor 10 is symmetrically fixedly mounted on both the left and right sides of the upper portion of the L-shaped mounting plate 3. The first rotating rod 11 is fixedly mounted on the output shaft of the second motor 10, and the second rotating rod 12 is fixedly mounted on the outer side of the end of the first rotating rod 11 away from the second motor 10. Figure 3 shown.

[0061] During use, the second motor 10 is started, and the output shaft of the second motor 10 drives the first rotating rod 11 to rotate. The first rotating rod 11 drives the second rotating rod 12 to rotate synchronously during the rotation process. The second rotating rod 12 can change from an inclined state to a horizontal straight state during the rotation process. Figure 3 shown.

[0062] An evaporation chamber shell 13 is fixedly installed on one end of the second rotating rod 12 away from the first rotating rod 11. After the second rotating rod 12 rotates to a horizontal straight state, the left and right evaporation chamber shells 13 can be tightly fitted together, so that the two evaporation chamber shells 13 can be combined into a cylindrical structure, and then the sample body 27 can be evaporated and dried in subsequent operations.

[0063] The left and right evaporation chamber shells 13 approach each other and eventually fit together to form a complete evaporation chamber. The inner walls of the evaporation chamber shells 13 are provided with a heating layer, which heats the evaporation chamber through the heating layer, allowing the oil reservoir sample in the evaporation chamber to evaporate quickly. At the same time, the outer side of the evaporation chamber shell 13 is also provided with an insulation layer, which can effectively reduce heat loss and improve heating efficiency. After the evaporation chamber shells 13 fit together to form the evaporation chamber, the upper sealing plate 7 will descend and closely contact the upper end surface of the evaporation chamber shell 13 to achieve sealing of the evaporation chamber and prevent steam leakage during the evaporation process.

[0064] A water tank 28 is fixedly mounted on the upper end surface of the workbench 1. The top of the water tank 28 is a hollow structure. In addition, a third motor 14 is provided on the lower end surface of the workbench 1. A main gear 15 is fixedly mounted on the output shaft of the third motor 14. Then, four sub-gears 16 are evenly arranged in a circular array on the outer side of the main gear 15 on the lower end surface of the workbench 1. The sub-gears 16 are all meshed with the main gear 15. Figure 8 shown.

[0065] A reciprocating screw 17 is fixedly mounted at the center of the upper end surface of the secondary gear 16, and the upper end of the reciprocating screw 17 passes through the workbench 1 and is located inside the water tank 28. Four second chutes 281 are opened on the inner circumferential surface of the water tank 28, and the reciprocating screw 17 is rotatably mounted inside the second chutes 281. Figure 6 shown.

[0066] During use, the third motor 14 is started, and the output shaft of the third motor 14 will rotate the main gear 15. The main gear 15 will rotate synchronously with the sub-gear 16 during the rotation. At this time, the sub-gear 16 can rotate synchronously with the reciprocating screw 17 during the rotation.

[0067] A first slide 18 is threadably mounted on the circumferential surface of the reciprocating screw 17 , and the first slide 18 is slidably mounted inside the second slide groove 281 . Therefore, during use, when the reciprocating screw 17 rotates, the first slide 18 can slide up and down inside the second slide groove 281 .

[0068] Then, a support rod 19 is fixedly installed at one end of the inner side of the first slide 18, and the ends of the four support rods 19 away from the first slide 18 are fixedly installed on the lower end surface of the weighing device 20, as shown in FIG. Figure 8 shown.

[0069] Therefore, during use, as the first slide 18 moves up and down, the support rod 19 can slide up and down synchronously with the weighing device 20.

[0070] A plurality of weighing springs 21 are evenly fixedly installed in a circular array on the upper end surface of the weighing device 20, and a support plate 22 is fixedly installed on the top of the weighing springs 21. Four first sliding grooves 24 are evenly opened in a circular array from the upper end to the outer circumferential surface of the support plate 22. An adjusting screw 25 is rotatably installed on the inner wall surface of the first sliding groove 24 to the outer side of the support plate 22, and a fixed arc plate 26 is threadedly installed on the circumferential surface of the adjusting screw 25. The fixed arc plate 26 is slidably installed inside the first sliding groove 24.

[0071] Among them, the weighing device 20 and the weighing spring 21 can cooperate with each other to support the support plate 22. At the same time, the weighing spring 21 has a certain elasticity and can be deformed when subjected to external force. In addition, the weighing spring 21 uses a pressure sensor spring to convert the mass of the sample body 27 into a pressure signal.

[0072] Secondly, the weighing device 20 has a built-in pressure sensor, which measures the mass of the sample body 27 in real time by sensing the pressure change of the weighing spring 21.

[0073] In addition, the elastic deformation of the weighing spring 21 combined with the high-sensitivity sensor of the weighing device 20 can achieve milligram-level precision measurement, which is superior to traditional static weighing equipment. The multiple spring rings are evenly distributed to ensure uniform force and reduce the influence of sample eccentricity on the measurement results.

[0074] The upper end surface of the support plate 22 is provided with a drain hole 23 between two adjacent first chutes 24, and then the sample body 27 is placed on the inner side of the fixed arc plate 26. Figure 7 shown.

[0075] During use, it is necessary to measure and calculate the different masses of the sample body 27, the mass of the sample after drying M1, the mass of the sample after saturation with water M2;

[0076] The mass difference is the mass of water in the pores, and the mass formula is as follows:

[0077] ;

[0078] Calculate the pore volume:

[0079] ;

[0080] Where V is the pore volume, For water quality, is the density of water;

[0081] Porosity calculation formula:

[0082] ;

[0083] R is the porosity, V is the pore volume, and S is the sample volume.

[0084] During the calculation process, the operator needs to measure the volume of the sample body 27 first, and during the operation, the surface of the sample body 27 saturated with water needs to be wiped to ensure that the surface is dry.

[0085] Step 1: Place the sample body 27 on the upper end surface of the support plate 22, rotate the adjusting screw 25, and fix the arc plate 26 to fix the sample body 27. The current mass of the sample body 27 is measured by the weighing device 20;

[0086] Step 2: Start the second motor 10. The output shaft of the second motor 10 rotates the first rotating rod 11. The first rotating rod 11 rotates the second rotating rod 12. The second rotating rod 12 rotates the evaporation chamber shell 13 synchronously. The evaporation chamber shell 13 wraps the sample body 27 and dries the sample body 27.

[0087] Step 3: The second motor 10 operates in the reverse direction, moving the evaporation chamber housing 13 away from the sample body. The first motor 4 is started, which drives the first gear 5 to rotate. The first gear 5 drives the rack rod 6 to descend. The rack rod 6 drives the lower end surface of the upper sealing plate 7 to fit the upper end surface of the sample body 27.

[0088] Step 4: Start the third motor 14. The output shaft of the third motor 14 rotates the main gear 15. The main gear 15 rotates the sub-gear 16. The sub-gear 16 rotates the reciprocating screw 17. When the reciprocating screw 17 rotates, the first slide 18 slides inside the second slide groove 281. The first slide 18 moves downward with the support rod 19.

[0089] Step 5: The support rod 19 moves downward, which in turn moves the weighing device 20, which in turn moves the weighing spring 21, which in turn moves the support plate 22, which in turn moves the sample body 27. At this time, the rack rod 6 moves downward in sync.

[0090] Step 6: Start the water pump 8, which injects water into the sample body 27 through the water pipe 9, allowing the sample body 27 to float out of the water tank 28. The water on the surface of the support plate 22 flows out of the drain hole 23. At this time, the sample body 27 is weighed by the weighing device 20.

[0091] Step 7: Calculate the porosity of the sample body 27 using the following formula:

[0092] During use, it is necessary to measure and calculate the different masses of the sample body 27, the mass of the sample after drying M1, the mass of the sample after saturation with water M2;

[0093] The mass difference is the mass of water in the pores, and the mass formula is as follows:

[0094] ;

[0095] Calculate the pore volume:

[0096] ;

[0097] Where V is the pore volume, For water quality, is the density of water;

[0098] Porosity calculation formula:

[0099] ;

[0100] R is the porosity, V is the pore volume, and S is the sample volume.

[0101] During the calculation process, the operator needs to measure the volume of the sample body 27 first, and during the operation, the surface of the sample body 27 saturated with water needs to be wiped to ensure that the surface is dry.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reservoir porosity measurement device, characterized in that: It comprises a workbench (1), an L-shaped mounting plate (3) is fixedly mounted at the rear end edge of the upper end surface of the workbench (1), and a rack rod (6) is slidably mounted at the front upper end of the L-shaped mounting plate (3); The lower end of the rack rod (6) is located inside the L-shaped mounting plate (3) and is fixedly mounted with an upper sealing disc (7); A sample body (27) is provided below the upper sealing disk (7); A support plate (22) is placed at the lower end of the sample body (27), and a weighing spring (21) is evenly fixedly installed in a circular array at the lower end of the support plate (22), and a weighing device (20) is fixedly provided at the lower end of the weighing spring (21); A water tank (28) is fixedly mounted on the upper end surface of the workbench (1) below the weighing device (20), and the sample body (27) can slide into the interior of the water tank (28); A second motor (10) is fixedly mounted on both left and right sides of the upper end of the L-shaped mounting plate (3); a first rotating rod (11) is fixedly mounted on the output shaft of the second motor (10); a second rotating rod (12) is fixedly mounted on the outer side of one end of the first rotating rod (11) away from the second motor (10); an evaporation chamber shell (13) is fixedly mounted on one end of the second rotating rod (12) away from the first rotating rod (11); and the evaporation chamber shell (13) can be assembled into a cylindrical structure.

2. The reservoir porosity measuring device according to claim 1, characterized in that: Support legs (2) are symmetrically fixedly installed on the left and right sides of the lower end surface of the workbench (1), and the support legs (2) are used to keep the workbench (1) away from the ground. A through hole (301) with a circular structure is opened from the upper end to the inner side surface of the L-shaped mounting plate (3), and the rack rod (6) is slidably installed inside the through hole (301).

3. The reservoir porosity measuring device according to claim 1, characterized in that: A symmetrical first motor (4) is fixedly mounted on the upper end surface of the L-shaped mounting plate (3), and a first gear (5) is fixedly mounted on the output shaft of each of the first motors (4). The first gears (5) are meshed with the rack rod (6), and the first gears (5) can drive the rack rod (6) to slide up and down inside the through hole (301).

4. The reservoir porosity measuring device according to claim 1, characterized in that: A water pump (8) is fixedly mounted on the upper end surface of the upper sealing disc (7), a water pipe (9) with a U-shaped structure is fixedly mounted on the upper end of the water pump (8), and a water pipe (9) with the same structure is also fixedly mounted from the lower end of the water pump (8) to the outer side of the lower end of the upper sealing disc (7).

5. The reservoir porosity measuring device according to claim 1, characterized in that: A third motor (14) is provided below the workbench (1), and a main gear (15) is fixedly mounted on the output shaft of the third motor (14). Sub-gears (16) are evenly arranged in a circular array below the workbench (1), and the number of the sub-gears (16) is four, and the sub-gears (16) are all meshed with the main gear (15) on the inside.

6. The reservoir porosity measuring device according to claim 5, characterized in that: A reciprocating screw (17) is fixedly mounted at the center position of the upper end surface of the secondary gear (16). The upper end of the reciprocating screw (17) passes through the workbench (1) and extends to the interior of the water tank (28). A second slide groove (281) is provided in an annular array on the inner circumferential surface of the water tank (28). The reciprocating screw (17) is rotatably mounted inside the second slide groove (281).

7. The reservoir porosity measuring device according to claim 6, characterized in that: A first slide (18) is rotatably mounted on the circumferential surface of the reciprocating screw (17), and the first slide (18) is slidably mounted inside the second slide groove (281). A support rod (19) is rotatably mounted on one end of the first slide (18) located outside the second slide groove (281), and the end of the support rod (19) away from the first slide (18) is rotatably connected to the lower end surface of the weighing device (20).

8. The reservoir porosity measuring device according to claim 1, characterized in that: The upper end surface of the support plate (22) is uniformly provided with a first slide groove (24) in an annular array, and an adjusting screw (25) is rotatably installed from the inside to the outside of the first slide groove (24), and a fixed arc plate (26) is threadedly installed on the circumferential surface of the adjusting screw (25), and the fixed arc plate (26) is slidably installed inside the first slide groove (24), and the inner wall can fit with the outer side surface of the sample, and a drainage hole (23) is opened between the upper end surface and the lower end surface of the support plate (22) and between two adjacent first slide grooves (24).

9. A method for measuring reservoir porosity, according to the apparatus for measuring reservoir porosity according to any one of claims 1 to 8, characterized in that: The measuring method comprises the following steps: Step 1: Place the sample body (27) on the upper end surface of the support plate (22), rotate the adjusting screw (25), fix the arc plate 26 to fix the sample body (27), and measure the current mass of the sample body (27) through the weighing device (20); Step 2: Start the second motor (10), the output shaft of the second motor (10) drives the first rotating rod (11) to rotate, the first rotating rod (11) drives the second rotating rod (12) to rotate, the second rotating rod (12) drives the evaporation chamber shell (13) to rotate synchronously, the evaporation chamber shell (13) wraps the sample body (27), and performs a drying operation on the sample body (27); Step 3: The second motor (10) operates in reverse, moving the evaporation chamber shell (13) away from the sample body (27), and the first motor (4) is started. The first motor (4) drives the first gear (5) to rotate, and the first gear (5) drives the rack rod (6) to descend. The rack rod (6) drives the lower end surface of the upper sealing plate (7) to fit the upper end surface of the sample body (27); Step 4: Start the third motor (14), the output shaft of the third motor (14) drives the main gear (15) to rotate, the main gear (15) drives the sub-gear (16) to rotate, the sub-gear (16) drives the reciprocating screw (17) to rotate, and when the reciprocating screw (17) rotates, the first slide (18) slides inside the second slide groove (281), and the first slide (18) drives the support rod (19) to move downward; Step 5: The support rod (19) moves downward, which will cause the weighing device (20) to move synchronously. The weighing device (20) will carry the weighing spring (21), the weighing spring (21) will carry the support plate (22), and the support plate (22) will carry the sample body (27). At this time, the rack rod (6) will move downward synchronously. Step 6: Start the water pump (8). The water pump (8) injects water into the interior of the sample body (27) through the water pipe (9), allowing the sample body (27) to float out of the interior of the water tank (28). The water flows out of the drain hole (23) on the surface of the support plate (22). At this time, the sample body (27) is weighed by the weighing device (20). Step 7: Calculate the porosity of the sample body (27) using the formula: (1) Measure and calculate the different masses of the sample body 27, the mass of the sample after drying M1, the mass of the sample after saturation with water M2, (2) The mass difference is the mass of water in the pores. The mass formula is as follows: ； (3) Calculation of pore volume: ； Where V is the pore volume, For water quality, is the density of water; (4) Porosity calculation formula: ； R is the porosity, V is the pore volume, and S is the sample volume.

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