A device for measuring the porosity of a reservoir rock sample

Abstract

The application relates to the technical field of oil exploration, in particular to a device for measuring the porosity of a reservoir rock sample; the device comprises a base, a core chamber, a sealing door, a placing seat, a gas cylinder and an opening and closing assembly; the opening and closing assembly comprises a U-shaped frame, a bidirectional threaded rod, two connecting rods, two sleeves, a connecting frame, a driving piece, a sealing piece, two guide rails and two sliding blocks; the U-shaped frame is fixedly connected with the core chamber; the two ends of the bidirectional threaded rod are rotationally connected with the U-shaped frame; the two sleeves are threadedly connected with the bidirectional threaded rod; the connecting frame is fixedly connected with the sealing door; the two ends of each connecting rod are rotationally connected with the connecting frame and the corresponding sleeve respectively; the two guide rails are fixedly connected with the core chamber and are located on the outer side walls of the core chamber respectively; the two sliding blocks are fixedly connected with the sealing door and are located in the corresponding guide rails respectively; the sealing door can be conveniently fixed outside the core chamber, and the sealing door can be conveniently closed and opened on the core chamber, so that the measuring efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of petroleum exploration technology, and in particular to a device for measuring the porosity of reservoir rock samples. Background Technology

[0002] Porosity refers to the ratio of the sum of the volumes of all pore spaces in a rock sample to the total volume of the rock sample, expressed as a percentage. The greater the total porosity of a reservoir, the larger the pore spaces within the rock. From a practical standpoint, only interconnected pores are meaningful, as they not only store oil and gas but also allow for their permeation. Therefore, the concept of effective porosity has been introduced in production practice. Effective porosity refers to the ratio of the sum of the volumes of interconnected pores that allow fluid flow under normal pressure conditions to the total volume of the rock sample, expressed as a percentage. Clearly, the effective porosity of the same rock is less than its total porosity.

[0003] In the existing technology patent CN211652453U, a device for measuring the porosity of reservoir rock samples is disclosed, including a core chamber, a sealed door, a base, and a placement seat. The placement seat is slidably installed in the core chamber. By pushing the placement seat with a cylinder, the rock sample can be quickly pushed out when the reservoir rock porosity measurement is completed and the sample needs to be replaced, without the need for manual removal of the reservoir rock. This improves the efficiency of rock sample replacement and measurement, facilitates the measurement of porosity for multiple rock samples, and improves the measurement efficiency.

[0004] However, in the existing methods described above, fixing the sealing door to the core chamber is quite complicated, making it inconvenient to close and open the sealing door on the core chamber, which greatly affects the measurement efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a device for measuring the porosity of reservoir rock samples, which solves the problem that the existing sealing door is complicated to fix on the core chamber, making it inconvenient to close and open the sealing door on the core chamber, which greatly affects the measurement efficiency.

[0006] To achieve the above objectives, the present invention employs a device for measuring the porosity of reservoir rock samples, comprising a base, a core chamber, a sealing door, a placement seat, a cylinder, and an opening / closing assembly. The cylinder is disposed within the core chamber, and the placement seat is movably disposed within the core chamber, also fixedly connected to the output end of the cylinder. The core chamber is fixedly connected to the base and located above the base. The sealing door is disposed outside the core chamber. The opening / closing assembly includes a U-shaped frame, a bidirectional threaded rod, two connecting rods, two sleeves, a connecting frame, a driving component, a sealing component, two guide rails, and two sliders. The U-shaped frame is fixedly connected to the core chamber and positioned... Above the core chamber, both ends of the bidirectional threaded rod are rotatably connected to the U-shaped frame. Two sleeves are fitted over the outside of the bidirectional threaded rod and threadedly engaged with it. The connecting frame is fixedly connected to the sealing door and located above it. Both ends of each connecting rod are rotatably connected to the connecting frame and the corresponding sleeve, respectively. Two guide rails are fixedly connected to the core chamber and located on the outer wall of the core chamber. Two sliders are fixedly connected to the sealing door and located within their respective guide rails. The sealing door has an annular groove, and the sealing element is disposed within the annular groove.

[0007] The device for measuring the porosity of reservoir rock samples also includes two guide rods and two support springs. Both guide rods are fixedly connected to the core chamber and are located above the core chamber. Both guide rods are also movably connected to the connecting frame and pass through the connecting frame. The two ends of each support spring are fixedly connected to the core chamber and the connecting frame, respectively, and are respectively sleeved on the outside of the corresponding guide rod.

[0008] The sealing element includes a sealing ring and multiple spring rods. The sealing ring is movably connected to the sealing door and is adapted to the annular groove. The multiple spring rods are all disposed in the annular groove and are all fixedly connected to the sealing ring.

[0009] The driving component includes a motor plate and a drive motor. The motor plate is fixedly connected to the U-shaped frame and is located on the outer side wall of the U-shaped frame. The drive motor is fixedly connected to the motor plate and is located above the motor plate. The output end of the drive motor is connected to the bidirectional threaded rod and passes through the U-shaped frame.

[0010] The device for measuring the porosity of reservoir rock samples also includes multiple sets of limiting components, all of which are mounted on the placement base.

[0011] The limiting component includes a supporting head, a movable rod, a stop block, and a limiting spring. The movable rod is slidably connected to the placement seat and passes through the placement seat. The supporting head is fixedly connected to one end of the movable rod, and the stop block is fixedly connected to the other end of the movable rod. The two ends of the limiting spring are fixedly connected to the stop block and the placement seat, respectively, and are sleeved on the outer wall of the movable rod.

[0012] The limiting component further includes a rubber sleeve, which is fixedly connected to the abutment head and fitted onto the outer wall of the abutment head.

[0013] This invention discloses a device for measuring the porosity of reservoir rock samples. When the sealed door of the core chamber is opened, the driving component on the U-shaped frame is activated. The driving component controls the rotation of the bidirectional threaded rod within the U-shaped frame. Since both sleeves are threadedly engaged with the bidirectional threaded rod, the two sleeves move relative to each other on the bidirectional threaded rod. At this time, the two connecting rods move on the sleeves respectively, gradually stretching and pushing the connecting frame upward. The connecting frame drives the sealed door to move upward outside the core chamber. Simultaneously, the sealing element enters the annular groove of the sealed door, and the sealed door moves upward. After the movement is completed, the core chamber is exposed. When the sealing door is reset outside the core chamber, the driving component controls the bidirectional threaded rod to reverse inside the U-shaped frame. The two sleeves move away from each other on the bidirectional threaded rod, and the two connecting rods pull the connecting member downward. The sealing door moves downward outside the core chamber until it closes the core chamber. At the same time, the sealing member moves out of the annular groove to maintain the seal inside the core chamber. In this way, it is possible to easily fix the sealing door outside the core chamber and to easily close and open the sealing door inside the core chamber, thus improving measurement efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0016] Figure 2 This is a rear view of the overall structure of the first embodiment of the present invention.

[0017] Figure 3 This is a cross-sectional view of the overall internal structure of the first embodiment of the present invention.

[0018] Figure 4 This is the first embodiment of the present invention. Figure 3 Enlarged view of the local structure at point A.

[0019] Figure 5 This is a cross-sectional view of the overall internal structure of the second embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the limiting component according to the second embodiment of the present invention.

[0021] Figure 7 This is a cross-sectional view of the overall internal structure of the third embodiment of the present invention.

[0022] Figure 8 This is the invention Figure 7 Enlarged view of the local structure at point B.

[0023] 101-Base, 102-Core chamber, 103-Sealed door, 104-Placement seat, 105-Cylinder, 106-U-shaped frame, 107-Double threaded rod, 108-Connecting rod, 109-Connecting frame, 110-Guide rail, 111-Slider, 112-Guide rod, 113-Support spring, 114-Sealing ring, 115-Spring rod, 116-Motor plate, 117-Drive motor, 118-Annular groove, 119-Sleeve, 201-Holding head, 202-Moving rod, 203-Stop block, 204-Limit spring, 205-Rubber sleeve, 301-Electric push rod, 302-Moving plate, 303-Wiping cotton, 304-Collection frame, 305-First magnet, 306-Second magnet. Detailed Implementation

[0024] The first embodiment is as follows:

[0025] Please see Figures 1-4 ,in Figure 1 This is a schematic diagram of the overall structure of the first embodiment. Figure 2 This is a rear view of the overall structure of the first embodiment. Figure 3 This is a cross-sectional view of the overall internal structure of the first embodiment. Figure 4 This is the first embodiment. Figure 3 Enlarged view of the local structure at point A.

[0026] This invention provides a device for measuring the porosity of reservoir rock samples, including a base 101, a core chamber 102, a sealing door 103, a placement seat 104, a cylinder 105, and an opening and closing assembly. The opening and closing assembly includes a U-shaped frame 106, a bidirectional threaded rod 107, two connecting rods 108, two sleeves 119, a connecting frame 109, a driving component, a sealing component, two guide rails 110, two sliders 111, two guide rods 112, and two support springs 113. The sealing component includes a sealing ring 114 and multiple spring rods 115. The driving component includes a motor plate 116 and a drive motor 117.

[0027] In this specific embodiment, the cylinder 105 is disposed within the core chamber 102, and the placement seat 104 is movably disposed within the core chamber 102. The placement seat 104 is also fixedly connected to the output end of the cylinder 105. The core chamber 102 is fixedly connected to the base 101 and is located above the base 101. The sealing door 103 is disposed on the outside of the core chamber 102. The placement seat 104 is slidably disposed within the core chamber 102. By pushing the placement seat 104 with the cylinder 105, the rock sample can be quickly ejected when the reservoir porosity measurement is completed and replaced, without the need for manual removal of the reservoir rock. This improves the efficiency of rock sample replacement and measurement, facilitates the measurement of porosity for multiple rock samples, and enhances the measurement efficiency.

[0028] The U-shaped frame 106 is fixedly connected to the core chamber 102 and located above the core chamber 102. Both ends of the bidirectional threaded rod 107 are rotatably connected to the U-shaped frame 106. Two sleeves 119 are fitted over the bidirectional threaded rod 107 and threadedly engaged with it. The connecting frame 109 is fixedly connected to the sealing door 103 and located above the sealing door 103. Both ends of each connecting rod 108 are rotatably connected to the connecting frame 109 and the corresponding sleeve 119, respectively. Both guide rails 110 are connected to the core chamber. 102 are fixedly connected and located on the outer side wall of the core chamber 102. Both sliders 111 are fixedly connected to the sealing door 103 and located within their respective guide rails 110. The sealing door 103 has an annular groove 118, and the sealing element is disposed within the annular groove 118. When the sealing door 103 is opened in the core chamber 102, the driving component on the U-shaped frame 106 is activated. The driving component controls the bidirectional threaded rod 107 to rotate within the U-shaped frame 106. Since both sleeves 119 are threadedly engaged with the bidirectional threaded rod 107, the two sleeves... The sleeve 119 will move relative to the bidirectional threaded rod 107. At this time, the two connecting rods 108 will move on the sleeve 119 respectively. The two connecting rods 108 will gradually stretch and push the connecting frame 109 upward. The connecting frame 109 will drive the sealing door 103 to move upward outside the core chamber 102. At the same time, the sealing element will enter the annular groove 118 of the sealing door 103. After the sealing door 103 moves into place, the core chamber 102 will be exposed. When the sealing door 103 is reset outside the core chamber 102, the bidirectional threaded rod is controlled by the driving component. 107 reverses inside the U-shaped frame 106, the two sleeves 119 move away from each other on the bidirectional threaded rod 107, the two connecting rods 108 pull the connecting member downwards, the sealing door 103 moves downwards outside the core chamber 102 until the sealing door 103 closes the core chamber 102, and at the same time the sealing member moves out from the annular groove 118 to maintain the seal inside the core chamber 102. In the above way, it is possible to easily fix the sealing door 103 outside the core chamber 102, and to facilitate the closing and opening of the sealing door 103 on the core chamber 102, thereby improving measurement efficiency.

[0029] Secondly, both guide rods 112 are fixedly connected to the core chamber 102 and are located above the core chamber 102. Both guide rods 112 are also movably connected to the connecting frame 109 and pass through the connecting frame 109. The two ends of each support spring 113 are fixedly connected to the core chamber 102 and the connecting frame 109, respectively, and are respectively sleeved on the outside of the corresponding guide rod 112. When the connecting frame 109 moves, the connecting frame 109 will slide on the two guide rods 112 and drive the two support springs 113 to stretch. The two support springs 113 can buffer and support the connecting frame 109, improving the stability of the sealing door 103 when it moves.

[0030] Meanwhile, the sealing ring 114 is movably connected to the sealing door 103 and adapted to the annular groove 118. Multiple spring rods 115 are all disposed in the annular groove 118 and fixedly connected to the sealing ring 114. When the sealing door 103 is opened, the sealing ring 114 is squeezed into the annular groove 118 of the sealing door 103 by the pressure from the outside of the core chamber 102. At the same time, the sealing ring 114 squeezes the multiple spring rods 115 as it enters the annular groove 118. When the sealing door 103 closes the core chamber 102, the sealing ring 114 is no longer restricted. At this time, the multiple spring rods 115 reset and push the sealing ring 114 into the core chamber 102, thereby keeping the sealing door 103 and the core chamber 102 sealed.

[0031] Additionally, the motor plate 116 is fixedly connected to the U-shaped frame 106 and located on the outer side wall of the U-shaped frame 106. The drive motor 117 is fixedly connected to the motor plate 116 and located above the motor plate 116. The output end of the drive motor 117 is connected to the bidirectional threaded rod 107 and passes through the U-shaped frame 106. The motor plate 116 provides fixed support for the drive motor 117 on the outside of the U-shaped frame 106. The output end of the drive motor 117 controls the bidirectional threaded rod 107 to rotate within the U-shaped frame 106.

[0032] When the sealing door 103 of the core chamber 102 is opened, the drive motor 117 of the motor plate 116 is activated. The drive motor 117 controls the bidirectional threaded rod 107 to rotate within the U-shaped frame 106. Since both sleeves 119 are threadedly engaged with the bidirectional threaded rod 107, the two sleeves 119 will move relative to each other on the bidirectional threaded rod 107. At this time, the two connecting rods 108 will move on the sleeves 119 respectively, gradually stretching and pushing the connecting frame 109 upward. The connecting frame 109 drives the sealing door 103 to move upward outside the core chamber 102. At the same time, the upward movement of the sealing door 103 will cause the sealing ring 114 to enter the annular groove 118 and squeeze the spring rod 115. After the sealing door 103 moves into place, the core chamber 102 is opened. 2. An opening is exposed; when the sealing door 103 is reset outside the core chamber 102, the drive motor 117 controls the bidirectional threaded rod 107 to reverse inside the U-shaped frame 106, the two sleeves 119 move away from each other on the bidirectional threaded rod 107, the two connecting rods 108 pull the connecting piece downwards, and the sealing door 103 moves downwards outside the core chamber 102 until the sealing door 103 closes the core chamber 102. At the same time, the sealing ring 114 is no longer restricted. At this time, the reset of the multiple spring rods 115 will push the sealing ring 114 into the core chamber 102, maintaining the seal inside the core chamber 102. In the above way, it is possible to easily fix the sealing door 103 outside the core chamber 102, and to easily close and open the sealing door 103 on the core chamber 102, thus improving measurement efficiency.

[0033] The second embodiment is as follows:

[0034] Based on the first embodiment, please refer to Figure 5 and Figure 6 ,in Figure 5 This is a cross-sectional view of the overall internal structure of the second embodiment. Figure 6 This is a schematic diagram of the limiting component in the second embodiment.

[0035] This invention provides a device for measuring the porosity of reservoir rock samples, which also includes multiple sets of limiting components. The limiting components include a support head 201, a movable rod 202, a stop block 203, a limiting spring 204, and a rubber sleeve 205.

[0036] In this specific embodiment, multiple sets of limiting components are disposed on the placement seat 104. By disposing of the limiting components on the placement seat 104, the rock sample can be stabilized within the placement seat 104, preventing the rock sample from moving easily within the placement seat 104, which is beneficial for measuring the rock sample.

[0037] The movable rod 202 is slidably connected to and passes through the placement seat 104. The abutment head 201 is fixedly connected to one end of the movable rod 202, and the stop block 203 is fixedly connected to the other end of the movable rod 202. The two ends of the limiting spring 204 are fixedly connected to the stop block 203 and the placement seat 104 respectively, and are sleeved on the outer wall of the movable rod 202. When measuring the rock sample, by placing the rock sample in the placement seat 104, the rock sample will be contacted by multiple abutment heads 201. Each abutment head... The head 201 will drive the movable rod 202 to slide on the placement seat 104. At the same time, the limiting spring 204 will be stretched as the movable rod 202 moves. The force of the limiting spring 204 will cause the holding head 201 to hold the outer wall of the rock sample, thereby fixing the rock sample in the placement seat 104. Then the sealing door 103 is closed and the equipment is started to measure the rock sample. In the above way, the rock sample can be stabilized in the placement seat 104, avoiding easy movement of the rock sample in the placement seat 104, which is conducive to the measurement of the rock sample.

[0038] Secondly, the rubber sleeve 205 is fixedly connected to the abutment head 201 and is sleeved on the outer wall of the abutment head 201. By setting the rubber sleeve 205 outside the abutment head 201, the rubber sleeve 205 can increase the friction between the abutment head 201 and the rock sample, and at the same time avoid the wear of the abutment head 201, so that the rock sample is more stably fixed in the placement seat 104.

[0039] During rock sample measurement, the rock sample is placed in the placement seat 104, where it is contacted by multiple abutment heads 201. Each abutment head 201 drives the movable rod 202 to slide on the placement seat 104. Simultaneously, the limiting spring 204 stretches as the movable rod 202 moves, and the force of the limiting spring 204 causes the abutment head 201 to abut against the outer wall of the rock sample, thus fixing the rock sample in the placement seat 104. Then, the sealing door 103 is closed, and the equipment is started to measure the rock sample. In addition, by providing a rubber sleeve 205 outside the abutment head 201, the rubber sleeve 205 can increase the friction between the abutment head 201 and the rock sample, while preventing wear on the abutment head 201, making the rock sample more stable in the placement seat 104. In this way, the rock sample can be firmly fixed in the placement seat 104, preventing the rock sample from moving easily in the placement seat 104, which is beneficial for rock sample measurement.

[0040] The third embodiment is as follows:

[0041] Based on the second embodiment, please refer to Figure 7 and Figure 8 ,in Figure 7This is a cross-sectional view of the overall internal structure of the third embodiment. Figure 8 yes Figure 7 Enlarged view of the local structure at point B.

[0042] The present invention provides a device for measuring the porosity of reservoir rock samples, which also includes a cleaning component. The cleaning component includes an electric push rod 301, a moving plate 302, a wiping cotton 303, a fixing component and a collection frame 304. The fixing component includes a first magnet 305 and a second magnet 306.

[0043] In this specific embodiment, the cleaning component is disposed on the placement base 104. By disposing of the cleaning component, the surface of the placement base 104 can be cleaned to remove rock debris, facilitating subsequent use.

[0044] The movable plate 302 is located inside the placement seat 104. The wiping cotton 303 is disposed on the outer wall of the movable plate 302. The collection frame 304 is located outside the placement seat 104. The fixing member is connected to the collection frame 304 and the placement seat 104 respectively. The electric push rod 301 is fixedly connected to the core chamber 102 and is located inside the core chamber 102. The output end of the electric push rod 301 is fixedly connected to the movable plate 302. After the rock sample measurement is completed, the rock sample is taken out of the placement seat 104, and then the... The electric push rod 301 is activated, and its output end extends, driving the moving plate 302 to move above the placement seat 104. Simultaneously, the wiping cotton 303 on the moving plate 302 cleans the surface of the placement seat 104. The wiping cotton 303 pushes the rock sample debris into the collection frame 304 for storage. After cleaning, the moving plate 302 is reset using the electric push rod 301. In this way, the surface of the placement seat 104 can be cleaned, and the rock sample debris can be cleaned for convenient subsequent use.

[0045] Secondly, the first magnet 305 is fixedly connected to the placement base 104 and located on the outside of the placement base 104. The second magnet 306 is fixedly connected to the collection frame 304 and located on the outside of the collection frame 304. The second magnet 306 and the first magnet 305 are magnetically attracted to each other. The collection frame 304 is fixed on the outside of the placement base 104 by the magnetic attraction between the second magnet 306 and the first magnet 305, which makes it convenient to put the collection frame 304 on the placement base 104 and facilitates the collection of rock sample debris.

[0046] After the rock sample measurement is completed, the rock sample is removed from the placement seat 104. Then, the electric push rod 301 is activated, and the output end of the electric push rod 301 extends, driving the moving plate 302 to move above the placement seat 104. At the same time, the wiping cotton 303 on the moving plate 302 cleans the surface of the placement seat 104. The wiping cotton 303 pushes the rock sample debris into the collection frame 304 for storage. After cleaning, the moving plate 302 is reset using the electric push rod 301. The collection frame 304 is fixed to the outside of the placement seat 104 by the magnetic attraction between the second magnet 306 and the first magnet 305, making it easy to put the collection frame 304 on the placement seat 104. In this way, the surface of the placement seat 104 can be cleaned and the rock sample debris can be cleaned for subsequent use.

[0047] The above description discloses only a variety of preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A device for measuring reservoir rock sample porosity, comprising a base, a core chamber, a sealing door, a placing seat and a gas cylinder, the gas cylinder is arranged in the core chamber, the placing seat is movably arranged in the core chamber, the placing seat is further fixedly connected with the output end of the gas cylinder, the core chamber is fixedly connected with the base and located above the base, and the sealing door is arranged outside the core chamber. Further comprising an opening and closing assembly, the opening and closing assembly comprises a U-shaped frame, a bidirectional threaded rod, two connecting rods, two sleeves, a connecting frame, a driving member, a sealing member, two guide rails and two sliding blocks, the U-shaped frame is fixedly connected with the core chamber and located above the core chamber, both ends of the bidirectional threaded rod are rotatably connected with the U-shaped frame, both the sleeves are sleeved on the outside of the bidirectional threaded rod and are in threaded cooperation with the bidirectional threaded rod, the connecting frame is fixedly connected with the sealing door and located above the sealing door, both ends of each connecting rod are rotatably connected with the connecting frame and the corresponding sleeve respectively, both the guide rails are fixedly connected with the core chamber and located on the outer side wall of the core chamber respectively, both the sliding blocks are fixedly connected with the sealing door and located in the corresponding guide rail respectively, the sealing door has an annular groove, and the sealing member is arranged in the annular groove. The sealing member comprises a sealing ring and a plurality of spring rods, the sealing ring is movably connected with the sealing door and matched with the annular groove, and the plurality of spring rods are arranged in the annular groove and fixedly connected with the sealing ring. When the sealing door is opened, the sealing ring is extruded into the annular groove of the sealing door by the outside of the core chamber, and at the same time, the sealing ring extrudes the plurality of spring rods when entering the annular groove, when the sealing door closes the core chamber, the sealing ring is no longer restricted, at this time, the plurality of spring rods reset the sealing ring to push it into the core chamber, so that the sealing door and the core chamber are kept sealed.

2. The device for measuring reservoir rock sample porosity according to claim 1, wherein the device further comprises two guide rods and two supporting springs, both the guide rods are fixedly connected with the core chamber and located above the core chamber, and both the guide rods are further movably connected with the connecting frame and penetrate through the connecting frame, and both ends of each supporting spring are fixedly connected with the core chamber and the connecting frame respectively and are sleeved on the outside of the corresponding guide rod.

3. The device for measuring reservoir rock sample porosity according to claim 1, wherein the driving member comprises a motor plate and a driving motor, the motor plate is fixedly connected with the U-shaped frame and located on the outer side wall of the U-shaped frame, the driving motor is fixedly connected with the motor plate and located above the motor plate, and the output end of the driving motor is connected with the bidirectional threaded rod and penetrates through the U-shaped frame.

4. The device for measuring reservoir rock sample porosity according to claim 1, wherein ​ ​ The measuring reservoir rock sample porosity device further comprises a plurality of limiting assemblies, and the plurality of limiting assemblies are arranged on the placing seat.

5. The measuring reservoir rock sample porosity device according to claim 4, characterized in that, The limiting assembly comprises a resisting head, a movable rod, a stop block and a limiting spring, the movable rod is in sliding connection with the placing seat and penetrates through the placing seat, the resisting head is fixedly connected with one end of the movable rod, the stop block is fixedly connected with the other end of the movable rod, and the limiting spring is fixedly connected with the stop block and the placing seat at two ends and is sleeved on the outer wall of the movable rod.

6. The measuring reservoir rock sample porosity device according to claim 5, characterized in that, The limiting assembly further comprises a rubber sleeve, and the rubber sleeve is fixedly connected with the resisting head and sleeved on the outer wall of the resisting head.

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