Oil reservoir porosity measuring method and device

Abstract

The invention relates to the technical field of porosity measuring devices, and particularly discloses an oil reservoir porosity measuring method and device which comprises a workbench, an L-shaped mounting plate is fixedly mounted at the edge of the rear end of the upper end face of the workbench, and a rack rod is slidably mounted on the front portion of the upper end of the L-shaped mounting plate; a sample main body is arranged below the upper sealing disc; the initial mass of the sample main body can be measured under the action of a weighing device, then the sample main body can be in a dry state under the action of a subsequent evaporation cavity shell, and at the moment, the mass of the dried sample main body can be obtained under the action of the weighing device; under the action of structures such as a rack rod, a water pump and a supporting rod, a sample main body can be soaked in the water tank, then the weight of the sample main body at the moment can be obtained under the action of a weighing device, and then the right side porosity in the sample main body can be calculated by utilizing 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 the porosity of oil reservoirs. Background Art

[0002] Geological cores are one of the important materials for underground oil reservoir research. The existing methods for measuring the porosity of cores mainly include methods such as the outer volume, pore volume, and solid volume of the core. The core scanning method belongs to a method for measuring porosity through the outer volume.

[0003] A core scanner is a very important device for geologists to collect images, analyze data, and properly store precious geological core samples. By scanning the core, the porosity can be obtained, and based on the porosity, the permeability can be analyzed. Based on the porosity and permeability, the basic conditions of the oil reservoir can be judged.

[0004] Currently, for the measurement of oil reservoir porosity on the market, most require the assistance of high-precision scanning devices to carry out operations, which leads to the need for waiting time during the measurement process. This is because the scanning process takes a long time, so a large amount of time is consumed.

[0005] Therefore, to save time and improve the measurement efficiency, we specifically propose a method and device for measuring the porosity of oil reservoirs. Summary of the Invention

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

[0007] To achieve the above purpose, the present invention provides the following technical solution: A method and device for measuring the porosity of oil reservoirs, including a workbench, on the upper end surface of the workbench, at the rear edge position, an L-shaped mounting plate is fixedly installed, and a rack bar is slidably installed at the front part of the upper end of the L-shaped mounting plate; At the lower end of the rack bar, inside the L-shaped mounting plate, an upper sealing disc is fixedly installed; Below the upper sealing disc, a sample main body is provided; At the lower end of the sample main body, a support disc is placed, and at the lower end of the support disc, weighing springs are fixedly installed evenly in a circular array, and at the lower end of the weighing springs, a weighing device is fixedly arranged; Below the weighing device, on the upper end surface of the workbench, a water tank is fixedly installed, and the sample main body can slide into the interior of the water tank.

[0008] Preferably, symmetrically fixed to the left and right sides of the lower end face of the workbench are support legs for keeping the workbench away from the ground. A circular through-hole is formed in the upper end to the inner side surface of the L-shaped mounting plate, and the rack bar is slidably installed inside the through-hole.

[0009] Preferably, symmetrically fixed to the upper end face of the L-shaped mounting plate are first motors. Fixed to the output shafts of the first motors are first gears, which are all meshed with the rack bar. The first gears can drive the rack bar to slide up and down inside the through-hole.

[0010] Preferably, fixed to the upper end face of the upper sealing disc is a water pump. Fixed to the upper end of the water pump is a U-shaped water pipe, and the same-structured water pipes are also fixed to the lower end of the water pump to the outer side of the lower end of the upper sealing disc.

[0011] Preferably, symmetrically fixed to the left and right sides of the upper end of the L-shaped mounting plate are second motors. Fixed to the output shafts of the second motors are first rotating rods. Fixed to the outer side of the end of the first rotating rod away from the second motor is a second rotating rod, and fixed to the end of the second rotating rod away from the first rotating rod is an evaporation chamber shell, which can be combined into a cylindrical structure.

[0012] Preferably, a third motor is arranged below the workbench. Fixed to the output shaft of the third motor is a main gear. Below the workbench, four sub-gears are evenly arranged in a circular array. The sub-gears are all meshed with the inner main gear.

[0013] Preferably, symmetrically fixed to the center positions of the upper end faces of the sub-gears are reciprocating screw rods. The upper ends of the reciprocating screw rods pass through the workbench and extend into the water tank. Second chutes are annularly arrayed on the inner circumferential surface of the water tank, and the reciprocating screw rods are rotatably installed inside the second chutes.

[0014] Preferably, first sliding platforms are threadedly rotatably installed on the circumferential surfaces of the reciprocating screw rods. The first sliding platforms are slidably installed inside the second chutes. One end of the first sliding platform located outside the second chute is rotatably installed with a support rod, and the end of the support rod away from the first sliding platform is rotatably connected to the lower end face of the weighing device.

[0015] Preferably, first chutes are annularly and evenly opened on the upper end face of the support disc. Adjusting screw rods are rotatably installed inside the first chutes to the outside. Fixed arc plates are threadedly rotatably installed on the circumferential surfaces of the adjusting screw rods. The fixed arc plates are slidably installed inside the first chutes, and the inner walls can fit with the outer side surface of the sample. Drainage holes are formed between adjacent two first chutes from the upper end face to the lower end face of the support disc.

[0016] A method for measuring the porosity of an oil reservoir, comprising the following steps: Step 1: Place the sample body on the upper end surface of the support plate, rotate the adjusting screw rod, and use the fixed arc plate 26 to fix the sample body. Measure the mass of the current sample body through the weighing device. 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, and 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. Step 3: The second motor operates in the reverse direction to move the evaporation chamber shell away from the sample body. Start the first motor. The first motor drives the first gear to rotate, and the first gear drives the rack bar to descend. The rack bar makes the lower end surface of the upper sealing plate fit with the upper end surface of the sample body. Step 4: Start the third motor. The output shaft of the third motor drives the main gear to rotate. The main gear drives the auxiliary gear to rotate, and the auxiliary gear drives the reciprocating screw rod to rotate. When the reciprocating screw rod rotates, the first sliding table slides inside the second sliding groove, and the first sliding table drives the support rod to move downward. Step 5: The downward movement of the support rod will drive the weighing device to move synchronously. The weighing device drives the weighing spring, the weighing spring drives the support plate, and the support plate drives the sample body. At this time, the rack bar moves downward synchronously. Step 6: Start the water pump. The water pump injects water into the sample body through the water pipe, causing the sample body to float out of the inside of the water tank. The water on the surface of the support plate flows out through the drain hole. At this time, the sample body is weighed through the weighing device. Step 7: Calculate the porosity of the sample body through the formula. The calculation formula is as follows: (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 being saturated with water is M2. (2) The mass difference is the mass of the water in the pores. The mass formula is as follows: ; (3) Calculate the pore volume: ; Where V is the pore volume, is the mass of water, is the density of water; (4) Porosity calculation formula: ; R is the porosity, V is the pore volume, and S is the sample volume.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. In the present invention, under the action of a weighing device, the initial mass of the sample main body can be measured. Then, under the action of the subsequent evaporation chamber shell, the sample main body can be in a dry state. At this time, under the action of the weighing device, the mass of the sample main body after drying can be obtained. Then, under the action of structures such as a rack bar, a water pump, and a support rod, the sample main body can be immersed in the water tank. Then, through the action of the weighing device, the weight of the sample main body at this time can be obtained. Then, the right porosity inside the sample main body can be calculated using a formula.

[0018] 2. In the present invention, through the mutual cooperation of a weighing spring and a rack bar, the mass measurement of the sample main body in different states is realized. This dynamic measurement method is more accurate than the traditional static measurement and can more truly reflect the physical properties of the sample main body. At the same time, through the cooperation of the water pump and the water tank, the sample main body can be conveniently immersed in water, thus simulating the actual situation in the oil reservoir and improving the accuracy and practicality of the measurement.

[0019] 3. The device of the present invention has a compact structure and is easy to operate, greatly improving the measurement efficiency and reducing the measurement cost, providing a new solution for the measurement of oil reservoir porosity. In addition, the device is reasonably designed, and the connection between each component is tight, ensuring the stability and reliability of the measurement. By optimizing the layout and cooperation of each component, the whole device runs more smoothly during operation, reducing the failure rate and maintenance cost. At the same time, the device also has a high degree of automation, which can reduce the error of manual operation, improving the accuracy and repeatability of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is the main structure diagram of the present invention; Figure 2 It is the structure diagram of the workbench and the L-shaped mounting plate of the present invention; Figure 3 It is the front view of the present invention; Figure 4 It is the structure diagram of the rack bar and the first gear of the present invention; Figure 5 It is the bottom view of the present invention; Figure 6 It is the schematic diagram of the water tank and the sample main body of the present invention; Figure 7Structural diagram of the support disk of the present invention; Figure 8 Schematic diagram of the main gear and the auxiliary gear of the present invention.

[0022] Explanation of reference numerals: 1, Workbench; 2, Support leg; 3, L-shaped mounting plate; 301, Through hole; 4, First motor; 5, First gear; 6, Rack bar; 7, Upper sealing disk; 8, Water pump; 9, Water pipe; 10, Second motor; 11, First rotating rod; 12, Second rotating rod; 13, Evaporation chamber shell; 14, Third motor; 15, Main gear; 16, Auxiliary gear; 17, Reciprocating screw; 18, First sliding table; 19, Support rod; 20, Weighing device; 21, Weighing spring; 22, Support disk; 23, Drain hole; 24, First chute; 25, Adjusting screw; 26, Fixed arc plate; 27, Sample main body; 28, Water tank; 281, Second chute. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1 to 8 , the present invention provides a technical solution: An oil reservoir porosity measurement method and device, including a workbench 1, and support legs 2 are symmetrically and fixedly installed on the left and right sides of the lower end surface of the workbench 1. With the support of the support legs 2, the workbench 1 can be kept away from the ground. Secondly, a vertically arranged 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 protrudes forward, as Figure 1 shown.

[0025] Moreover, at the center position of the front end of the top of the L-shaped mounting plate 3, a circular through hole 301 is opened from the upper end surface to the lower end surface. Then, symmetric first motors 4 are fixedly installed at the edge of the through hole 301 on the top of the L-shaped mounting plate 3. A first gear 5 is fixedly installed on the output shaft of the first motor 4, as Figure 3 shown.

[0026] Inside the through hole 301, a first gear 5 is slidably installed. The first gears 5 on the left and right sides are also in a meshing state with each other. Therefore, during use, when the first motor 4 is started, the output shaft of the first motor 4 drives the first gear 5 to rotate. During the rotation of the first gear 5, it can drive the rack bar 6 to slide inside the through hole 301, thereby being able to change the height of the subsequent rack bar 6.

[0027] At the lower end of the rack bar 6, a circular upper sealing plate 7 is fixedly installed. The upper sealing plate 7 can move up and down along with the movement of the rack bar 6.

[0028] On the upper part of the L-shaped mounting plate 3, second motors 10 are symmetrically and fixedly installed on both the left and right sides. On the output shafts of the second motors 10, first rotating rods 11 are fixedly installed. And on the outer sides of the ends of the first rotating rods 11 away from the second motors 10, second rotating rods 12 are fixedly installed, as Figure 3 shown.

[0029] During use, when the second motor 10 is started, the output shaft of the second motor 10 drives the first rotating rod 11 to rotate. And during the rotation of the first rotating rod 11, it drives the second rotating rod 12 to rotate synchronously. During the rotation of the second rotating rod 12, it can change from an inclined state to a horizontal straight line state finally, as Figure 3 shown.

[0030] At the end of the second rotating rod 12 away from the first rotating rod 11, an evaporation chamber shell 13 is fixedly installed. And after the second rotating rod 12 rotates to the horizontal straight line state, it can make the two evaporation chamber shells 13 on the left and right fit tightly together, so that the two evaporation chamber shells 13 can be combined into a cylindrical structure, and then in subsequent operations, the sample main body 27 can be subjected to evaporation drying operations.

[0031] The two evaporation chamber shells 13 on the left and right approach each other and finally fit together to form a complete evaporation chamber. Heating layers are provided on the inner walls of the evaporation chamber shells 13. By heating the evaporation chamber through the heating layers, the reservoir samples in the evaporation chamber can be evaporated quickly. At the same time, heat insulation layers are also provided on the outer sides of the evaporation chamber shells 13. The heat insulation layers can effectively reduce heat dissipation and improve the heating efficiency. After the evaporation chamber shells 13 fit together to form the evaporation chamber, the upper sealing plate 7 will descend and be in close contact with the upper end surfaces of the evaporation chamber shells 13 to seal the evaporation chamber and prevent steam leakage during the evaporation process.

[0032] The upper end surface of the workbench 1 is fixedly installed with a water tank 28. The top of the water tank 28 has a cavity structure inside. And, a third motor 14 is arranged on the lower end surface of the workbench 1. A main gear 15 is fixedly installed on the output shaft of the third motor 14. Then, four sub-gears 16 are evenly arranged in a circular array on the lower end surface of the workbench 1 outside the main gear 15. The sub-gears 16 are all meshed with the main gear 15, as Figure 8 shown.

[0033] The center position of the upper end surface of the sub-gear 16 is fixedly installed with a reciprocating screw rod 17. The upper end of the reciprocating screw rod 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. The reciprocating screw rod 17 is rotatably installed inside the second chute 281, as Figure 6 shown.

[0034] During the use process, start the third motor 14. The output shaft of the third motor 14 will drive the main gear 15 to rotate. When the main gear 15 rotates, it will drive the sub-gears 16 to rotate synchronously. At this time, when the sub-gears 16 rotate, they can drive the reciprocating screw rod 17 to rotate synchronously.

[0035] A first sliding table 18 is threadedly and rotatably installed on the circumferential surface of the reciprocating screw rod 17. The first sliding table 18 is slidably installed inside the second chute 281. Therefore, during the use process, when the reciprocating screw rod 17 rotates, it can make the first sliding table 18 slide up and down inside the second chute 281.

[0036] Then, one end of the inner side of the first sliding table 18 is fixedly installed with a support rod 19. The four support rods 19 are all fixedly installed on the lower end surface of the weighing device 20 away from the first sliding table 18, as Figure 8 shown.

[0037] Therefore, during the use process, as the first sliding table 18 moves up and down, it can make the support rod 19 drive the weighing device 20 to slide up and down synchronously.

[0038] A plurality of weighing springs 21 are evenly and fixedly installed on the upper end surface of the weighing device 20 in a circular array. A support plate 22 is fixedly installed on the top of the weighing springs 21 together. Four first chutes 24 are evenly opened on the upper end to the outer circumferential surface of the support plate 22 in a circular array. An adjusting screw rod 25 is rotatably installed on the inner wall surface of the first chute 24 to the outside of the support plate 22. A fixed arc plate 26 is threadedly and rotatably installed on the circumferential surface of the adjusting screw rod 25. The fixed arc plate 26 is slidably installed inside the first chute 24.

[0039] Among them, the weighing device 20 and the weighing spring 21 can cooperate with each other to support the support disk 22. At the same time, the weighing spring 21 has a certain elasticity and can deform when subjected to an external force. Moreover, the weighing spring 21 is a pressure sensor spring, which is used to convert the mass of the sample main body 27 into a pressure signal.

[0040] Secondly, a pressure sensor is built into the weighing device 20. By sensing the pressure change of the weighing spring 21, the mass of the sample main body 27 is measured in real time.

[0041] Moreover, the elastic deformation of the weighing spring 21 is combined with the high-sensitivity sensor of the weighing device 20, which can achieve milligram-level precision measurement, superior to traditional static weighing equipment. The multi-spring annular uniform distribution ensures uniform force and reduces the influence of sample eccentricity on the measurement results.

[0042] Drainage holes 23 are provided on the upper end surface of the support disk 22 between two adjacent first chutes 24. Then, the sample main body 27 is placed inside the fixed arc plate 26, as Figure 7 shown.

[0043] During the use process, it is necessary to measure and calculate the different masses of the sample main body 27, the mass M1 of the sample after drying, and the mass M2 of the sample after being saturated with water; The mass difference is the mass of the water in the pores. The mass formula is as follows: ; Calculate the pore volume: ; Among them, V is the pore volume, is the water mass, is the density of water; Pore porosity calculation formula: ; R is the pore porosity, V is the pore volume, and S is the sample volume.

[0044] During the calculation process, it is necessary for the operator to first measure the volume of the sample main body 27, and during the operation process, it is necessary to wipe the surface of the sample main body 27 after being saturated with water to ensure the surface is dry.

[0045] Step 1: Place the sample main body 27 on the upper end surface of the support disk 22, rotate the adjusting screw 25, and the fixed arc plate 26 performs a fixing operation on the sample main body 27. Through the weighing device 20, the mass of the current sample main body 27 is measured; 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 main body 27 and performs a drying operation on the sample main body 27; Step 3: The second motor 10 operates in the reverse direction to move the evaporation chamber shell 13 away from the sample main body. Start the first motor 4. The first motor 4 drives the first gear 5 to rotate. The first gear 5 drives the rack bar 6 to descend. The rack bar 6 makes the lower end surface of the upper sealing disk 7 fit with the upper end surface of the sample main 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 rod 17 to rotate. When the reciprocating screw rod 17 rotates, the first sliding table 18 slides inside the second chute 281, and the first sliding table 18 drives the support rod 19 to move downward; Step 5: The downward movement of the support rod 19 drives the weighing device 20 to move synchronously. The weighing device 20 drives the weighing spring 21. The weighing spring 21 drives the support disk 22. The support disk 22 drives the sample main body 27. At this time, the rack bar 6 moves downward synchronously; Step 6: Start the water pump 8. The water pump 8 injects water into the sample main body 27 through the water pipe 9 to make the sample main body 27 float out of the inside of the water tank 28. The water on the surface of the support disk 22 flows out through the drain hole 23. At this time, the weighing device 20 weighs the sample main body 27; Step 7: Calculate the porosity of the sample main body 27 through the formula. The calculation formula is as follows; During the use process, it is necessary to measure and calculate the different masses of the sample main body 27. The mass of the sample after drying is M1, and the mass of the sample after being saturated with water is M2; The mass difference is the mass of the water in the pores. The mass formula is as follows: ; Calculate the pore volume: ; Among them, V is the pore volume, is the water mass, is the density of water; Porosity calculation formula: ; R is the porosity, V is the pore volume, and S is the sample volume.

[0046] During the calculation process, it is necessary for the operator to first measure the volume of the sample main body 27, and during the operation process, it is necessary to wipe the surface of the sample main body 27 after being saturated with water to ensure the surface is dry.

[0047] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An oil reservoir porosity measurement device, characterized in that: It includes a workbench (1), and an L-shaped mounting plate (3) is fixedly installed at the position of the rear edge of the upper end surface of the workbench (1). A rack bar (6) is slidably installed at the front part of the upper end of the L-shaped mounting plate (3); A upper sealing disk (7) is fixedly installed at the lower end of the rack bar (6) inside the L-shaped mounting plate (3); A sample body (27) is arranged below the upper sealing disk (7); A support disk (22) is placed at the lower end of the sample body (27). Weighing springs (21) are fixedly installed evenly in a circular array at the lower end of the support disk (22). A weighing device (20) is fixedly arranged at the lower end of the weighing springs (21); A water tank (28) is fixedly installed 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).

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

3. The porosity measuring device for reservoir according to claim 1, wherein: First motors (4) are fixedly installed on the upper end surface of the L-shaped mounting plate (3) in a symmetrical state. First gears (5) are fixedly installed on the output shafts of the first motors (4). The first gears (5) are all meshed with the rack bar (6), and the first gears (5) can drive the rack bar (6) to slide up and down inside the through-hole (301).

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

5. The porosity measuring device for oil reservoir according to claim 4, characterized in that: Second motors (10) are fixedly installed on the left and right sides of the upper end of the L-shaped mounting plate (3). First rotating rods (11) are fixedly installed on the output shafts of the second motors (10). A second rotating rod (12) is fixedly installed on the outer side of the end of the first rotating rod (11) away from the second motor (10). An evaporation chamber shell (13) is fixedly installed at the end of the second rotating rod (12) away from the first rotating rod (11), and the evaporation chamber shells (13) can be combined into a cylindrical structure.

6. The porosity measuring device for oil reservoir according to claim 5, wherein: A third motor (14) is arranged below the workbench (1). A main gear (15) is fixedly installed on the output shaft of the third motor (14). Auxiliary gears (16) are evenly arranged in a circular array below the workbench (1). The number of the auxiliary gears (16) is four, and the auxiliary gears (16) are all meshed with the main gear (15) inside; 7. An apparatus for measuring reservoir porosity according to claim 6, characterized in that: Reciprocating screws (17) are fixedly installed at the central positions of the upper end surfaces of the auxiliary gears (16). The upper ends of the reciprocating screws (17) pass through the workbench (1) and extend into the interior of the water tank (28). Second sliding grooves (281) are formed in a circular array on the inner circumferential surface of the water tank (28), and the reciprocating screws (17) are rotatably installed inside the second sliding grooves (281).

8. An apparatus for measuring reservoir porosity according to claim 7, characterized in that: On the circumferential surface of the reciprocating screw rod (17), a first sliding table (18) is threadedly and rotatably installed. The first sliding table (18) is slidably installed inside the second sliding groove (281). At the outer ends of the first sliding table (18) located outside the second sliding groove (281), support rods (19) are rotatably installed. One end of the support rod (19) away from the first sliding table (18) is rotatably connected to the lower end surface of the weighing device (20).

9. The porosity measuring device for oil reservoir according to claim 1, wherein: On the upper end surface of the support disc (22), a first sliding groove (24) is evenly opened in an annular array. Inside the first sliding groove (24), an adjusting screw rod (25) is rotatably installed from the inside to the outside. On the circumferential surface of the adjusting screw rod (25), a fixed arc plate (26) is threadedly and rotatably installed. The fixed arc plate (26) is slidably installed inside the first sliding groove (24), and its inner wall can be attached to the outer side surface of the sample. A water drainage hole (23) is opened between adjacent two first sliding grooves (24) from the upper end surface to the lower end surface of the support disc (22).

10. A method for measuring the porosity of an oil reservoir, according to the oil reservoir porosity measuring device according to any one of claims 1-9, characterized in that: The measurement method includes the following steps: Step 1: Place the sample body (27) on the upper end surface of the support disc (22). Rotate the adjusting screw rod (25), and the fixed arc plate 26 performs a fixing operation on the sample body (27). Through the weighing device (20), measure the mass of the current sample body (27). 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 the reverse direction to move the evaporation chamber shell (13) away from the sample body (27). Start the first motor (4). The first motor (4) drives the first gear (5) to rotate. The first gear (5) drives the rack bar (6) to descend. The lower end surface of the rack bar (6) is attached to 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 auxiliary gear (16) to rotate. The auxiliary gear (16) drives the reciprocating screw rod (17) to rotate. When the reciprocating screw rod (17) rotates, the first sliding table (18) slides inside the second sliding groove (281), and the first sliding table (18) drives the support rod (19) to move downward. Step 5: The downward movement of the support rod (19) drives the weighing device (20) to move synchronously. The weighing device (20) drives the weighing spring (21). The weighing spring (21) drives the support disc (22). The support disc (22) drives the sample body (27). At this time, the rack bar (6) moves downward synchronously. Step 6: Start the water pump (8). The water pump (8) injects water into the sample body (27) through the water pipe (9) to make the sample body (27) float out of the inside of the water tank (28). The water on the surface of the support disc (22) flows out through the water drainage hole (23). At this time, the sample body (27) is weighed through the weighing device (20). Step 7: Calculate the porosity of the sample body (27) through the formula. The calculation formula is as follows: (1) Measure and calculate the masses of different parts of the sample body 27. The mass of the sample after drying is M1, and the mass of the sample after being saturated with water is M2; (2) The mass difference is the mass of the water in the pores. The mass formula is as follows: ； (3) Calculate the pore volume: ； where V is the pore volume, is the mass of water, is the density of water; (4) The porosity calculation formula: ； R is the porosity, V is the pore volume, and S is the sample volume.

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