Rock permeability testing device

Abstract

The utility model relates to the technical field of rock detection, in particular to a rock permeability testing device. The rock permeability testing device comprises a mounting frame, and a fixing assembly for containing a rock sample is arranged in the mounting frame; the fixing assembly comprises two fixing half cylinders, the two fixing half cylinders are symmetrically distributed, rubber sheets abutting against the outer wall of the rock sample are fixedly installed on the side walls of the fixing half cylinders, and upper sealing discs for blocking the top ends of the fixing half cylinders are arranged at the tops of the fixing half cylinders; and a lower sealing disc for blocking the bottom end of the fixed half cylinder is arranged at the bottom of the fixed half cylinder. According to the rock permeability testing device provided by the utility model, in the testing process, the opening position of the gas injection head can be changed as required, so that the injection position of gas into the end part of a rock sample can be adjusted, a worker can obtain more groups of test data, and the comprehensiveness of the test data can be improved.

Description

Technical Field

[0001] This utility model relates to the field of rock detection technology, and in particular to a rock permeability testing device. Background Technology

[0002] Permeability refers to the ability of rock to allow fluids to pass through it under a given pressure difference. It is a parameter characterizing the ability of soil or rock to conduct liquids. Its magnitude is related to factors such as porosity, the geometry of the pores in the direction of liquid permeation, particle size, and their arrangement, but is independent of the properties of the liquid moving in the medium. Permeability is used to express the magnitude of permeability. Permeability is an important indicator of the fluid-allowing capacity of a rock core and directly affects the production of oil and gas wells.

[0003] The existing testing devices are generally used by placing the rock sample column to be tested in a closed testing cylinder, injecting gas into one end of the testing cylinder, and then observing the gas pressure change at the other end for testing. This gas injection method can only obtain the permeability at a fixed inlet position during testing. Since the internal structure of the rock is unevenly distributed, it reduces the comprehensiveness of the subsequent testing data to a certain extent.

[0004] Therefore, it is necessary to provide a new rock permeability testing device to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a rock permeability testing device.

[0006] The rock permeability testing device provided by this utility model includes: a mounting frame, wherein a fixing component for holding a rock sample is provided inside the mounting frame;

[0007] The fixing assembly includes a fixing half-cylinder, two of which are symmetrically distributed. A rubber sheet that abuts against the outer wall of the rock sample is fixedly installed on the side wall of the fixing half-cylinder. An upper sealing plate is provided at the top of the fixing half-cylinder to seal the top of the fixing half-cylinder, and a lower sealing plate is provided at the bottom of the fixing half-cylinder to seal the bottom of the fixing half-cylinder.

[0008] The top of the upper sealing plate is provided with multiple mounting slots. A connecting pipe is fixedly embedded inside the mounting slot. A communicating air injection head is fixedly installed at the bottom end of the connecting pipe. A communicating adapter pipe is fixedly installed at the top end of the connecting pipe. A valve is fixedly installed on the adapter pipe. A rubber pad that abuts against the rock sample is fixedly installed at the end of the air injection head.

[0009] The top of multiple adapter pipes is fixedly installed with the same air guide plate, the interior of the air guide plate is connected to the interior of the adapter pipe, and the top of the air guide plate is fixedly installed with an air injection pipe connected to its interior.

[0010] Preferably, a support frame is fixedly installed on the top of the lower sealing plate, a sliding frame is inserted into the support frame, and a support ring for supporting the rock sample is provided above the sliding frame.

[0011] Preferably, a plurality of telescopic rods are fixedly installed between the support ring and the sliding frame, and a spring is sleeved on the outside of the telescopic rod. The top end of the spring is fixedly connected to the bottom of the support ring, and the bottom end of the spring is fixedly connected to the top of the sliding frame.

[0012] Preferably, the support frame is provided with a threaded adjusting rod, and the top end of the adjusting rod is rotatably connected to the inner top of the sliding frame.

[0013] Preferably, both the lower sealing disc and the upper sealing disc are fixedly installed with rubber rings that abut against their ends on the side near the fixed half-cylinder. An exhaust pipe is fixedly installed at the bottom of the lower sealing disc, and a pressure transmitter for measuring the internal air pressure is provided on the exhaust pipe.

[0014] Preferably, a vertical hydraulic cylinder is fixedly installed between the lower sealing plate and the upper sealing plate and the mounting frame, and a water hydraulic cylinder is fixedly installed between the fixed half cylinder and the mounting frame.

[0015] Compared with related technologies, the rock permeability testing device provided by this utility model has the following beneficial effects:

[0016] 1. By setting multiple gas injection heads in the fixed assembly, the opening position of the gas injection heads can be changed as needed during the test, thereby adjusting the position of the gas injected into the end of the rock sample. This allows the staff to obtain more sets of test data, thus improving the comprehensiveness of the test data.

[0017] 2. By adjusting the height of the support ring, this utility model ensures the correct position of the rock sample when the required test height varies. This allows the upper sealing plate to move downwards to seal the top of the fixed half-cylinder, ensuring the bottom of the gas injection head simultaneously abuts against the top of the sample. This allows the gas injection head to smoothly inject gas into samples of various heights, thus improving the applicability of the device. Attached Figure Description

[0018] Figure 1 A schematic diagram of a preferred embodiment of the rock permeability testing device provided by this utility model;

[0019] Figure 2 for Figure 1 The diagram shows the structural connection between the mounting frame and the fixing components.

[0020] Figure 3 for Figure 1 A schematic diagram of the support frame and its components shown;

[0021] Figure 4 for Figure 1 The diagram shows the structure of the upper sealing disc and its components.

[0022] The following are the labeling elements in the diagram: 1. Mounting frame; 2. Fixing component; 21. Fixing half-cylinder; 211. Horizontal hydraulic cylinder; 212. Rubber sheet; 22. Upper sealing plate; 221. Mounting groove; 222. Connecting pipe; 223. Air injection head; 23. Lower sealing plate; 231. Exhaust pipe; 24. Rubber ring; 25. Vertical hydraulic cylinder; 3. Support frame; 31. Adjusting rod; 32. Sliding frame; 4. Air guide plate; 41. Air injection pipe; 42. Adaptor pipe; 421. Valve; 5. Telescopic rod; 51. Spring; 6. Support ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0025] Please see Figures 1 to 4 The present invention provides a rock permeability testing device, which includes: a mounting frame 1, and a fixing component 2 for holding a rock sample inside the mounting frame 1.

[0026] In the embodiments of this utility model, please refer to Figures 1 to 4The fixing component 2 includes a fixing half-cylinder 21, of which two are symmetrically distributed. A rubber sheet 212, which abuts against the outer wall of the rock sample, is fixedly installed on the side wall of the fixing half-cylinder 21. An upper sealing plate 22 is provided at the top of the fixing half-cylinder 21 to seal the top end, and a lower sealing plate 23 is provided at the bottom of the fixing half-cylinder 21 to seal the bottom end. Multiple mounting grooves 221 are formed on the top of the upper sealing plate 22, and mating parts are fixedly embedded inside the mounting grooves 221. Pipe 222, with a connected air injection head 223 fixedly installed at the bottom end of pipe 222, and a connected adapter pipe 42 fixedly installed at the top end of pipe 222. A valve 421 is fixedly installed on the adapter pipe 42, and a rubber pad that abuts against the rock sample is fixedly installed at the end of the air injection head 223. The same air guide plate 4 is fixedly installed on the top of multiple adapter pipes 42. The interior of the air guide plate 4 is connected to the interior of the adapter pipe 42, and an air injection pipe 41 connected to its interior is fixedly installed on the top of the air guide plate 4.

[0027] It should be noted that: by setting multiple gas injection heads 223 in the fixed component 2 and valves 421 on the adapter pipe 42, during the test, the valves 421 on the adapter pipe 42 can be opened sequentially as needed, so that the gas can flow smoothly into the corresponding gas injection head 223 for injection. By controlling the opening state of multiple valves 421, the opening state of different gas injection heads 223 can be changed, thereby adjusting the position of gas injection at the end of the rock sample, so that the staff can obtain more sets of test data later, thus improving the comprehensiveness of the test data.

[0028] In this embodiment: by setting the rubber pad, the rubber pad can make the gas injection head 223 fit more tightly against the top of the rock sample, so that the gas discharged from the gas injection head 223 can flow smoothly into the rock sample, reducing the probability of gas leakage in all directions.

[0029] Meanwhile, by setting the rubber sheet 212 and rubber ring 24 on the side wall of the fixed half cylinder 21, when the two fixed half cylinders 21 abut against each other and against the corresponding upper sealing plate 22 and lower sealing plate 23, the resulting holding chamber can more tightly wrap the rock sample. When the rubber sheet 212 abuts against the outer wall of the rock sample, the rubber sheet 212 can deform under the action of extrusion pressure, thereby making the outer wall of the rock sample fit tightly, making the fixed half cylinder 21 more tightly wrap the rock sample, and thus reducing the influence of gas flowing down from the side wall of the rock sample during gas injection on the test data, thus helping to improve the accuracy of the test data.

[0030] In the embodiments of this utility model, please refer to Figures 1 to 4A support frame 3 is fixedly installed on the top of the lower sealing plate 23. A sliding frame 32 is inserted into the support frame 3 and is slidably connected. A support ring 6 is provided above the sliding frame 32 to support the rock sample. Multiple telescopic rods 5 are fixedly installed between the support ring 6 and the sliding frame 32. A spring 51 is sleeved on the outside of the telescopic rod 5. The top end of the spring 51 is fixedly connected to the bottom of the support ring 6 and the bottom end of the spring 51 is fixedly connected to the top of the sliding frame 32. A threaded adjusting rod 31 is inserted inside the support frame 3 and the top end of the adjusting rod 31 is rotatably connected to the inner top of the sliding frame 32.

[0031] It should be noted that: by setting the adjusting rod 31, the adjusting rod 31 can be rotated during use. The rotation of the adjusting rod 31 will move the sliding frame 32 inside the support frame 3, thereby driving the upper support ring 6 to adjust the position of the upper rock sample. This makes the distance between the top of the rock sample and the gas injection head 223 the same as the distance between the bottom of the upper sealing plate 22 and the top of the fixed half cylinder 21. This allows the gas injection head 223 to smoothly abut against the top of the rock sample when the upper sealing plate 22 seals the top of the fixed half cylinder 21, and thus allows the gas injection head to smoothly abut against the top of rock samples of different heights for gas injection.

[0032] In this embodiment, the adjusting rod 31 is fitted with a protective sleeve to protect its external thread structure, thereby avoiding the probability that external debris particles will fall on the threads of the adjusting rod 31 and cause obstruction during subsequent use.

[0033] By using the telescopic rod 5 and spring 51, in its natural state, spring 51 supports the rock sample placed on the support ring 6 through its own force. This ensures that the telescopic rod 5 remains extended until the lower sealing plate 23 abuts against the bottom of the fixed half-cylinder 21. When the vertical hydraulic cylinder 25 operates to drive the lower sealing plate 23 to abut against the bottom of the fixed half-cylinder 21, the driving force compresses the telescopic rod 5, causing it to retract. This allows the top of the lower sealing plate 23 to smoothly abut against the bottom of the fixed half-cylinder 21. During this process, the compressive force of the lower sealing plate 23 on the telescopic rod 5 and spring 51 is less than the clamping force of the fixed half-cylinder 21 on the rock sample, thus preventing displacement of the rock sample when the bottom of the fixed half-cylinder 21 is sealed.

[0034] In the embodiments of this utility model, please refer to Figures 1 to 4 A vertical hydraulic cylinder 25 is fixedly installed between the lower sealing plate 23 and the upper sealing plate 22 and the mounting frame 1, and a horizontal hydraulic cylinder 211 is fixedly installed between the fixed half cylinder 21 and the mounting frame 1.

[0035] It should be noted that: with the setting of vertical hydraulic cylinder 25 and horizontal hydraulic cylinder 211, during use, the working vertical hydraulic cylinder 25 and horizontal hydraulic cylinder 211 will drive the lower sealing plate 23, upper sealing plate 22 and fixed half cylinder 21 connected to them, thereby enabling the fixed half cylinder 21 to flexibly assemble and unfold with the lower sealing plate 23 and upper sealing plate 22. Therefore, it makes the subsequent wrapping, clamping and placement of rock samples on the support ring 6 more flexible for the staff.

[0036] The working principle of the rock permeability testing device provided by this utility model is as follows:

[0037] Before using this testing device, the staff can connect the air injection pipe 41 in the device to the output pipe of the external air pump. After completing the connection of the pipe, the rock sample to be tested can be placed on the support ring 6.

[0038] After the rock sample is placed, the adjusting rod 31 can be rotated according to the height of the rock sample. The rotating adjusting rod 31 will move vertically in a spiral direction inside the support frame 3 through the threaded structure. At the same time, since the top of the adjusting rod 31 is rotatably connected to the sliding frame 32, the moving adjusting rod 31 can synchronously drive the sliding frame 32 and other components at the top to move, thereby realizing the adjustment of the vertical position of the rock sample above. During this movement, the staff can control the moving distance of the sliding frame 32 by comparing the scale strip on the support rod in the sliding frame 32 with the support frame 3, thus making the position adjustment of the sliding frame 32 more precise.

[0039] After the position of the rock sample is adjusted, the horizontal hydraulic cylinders 211 on both sides can be extended by the controller of the external terminal. The extended horizontal hydraulic cylinders 211 will drive the fixed half cylinders 21 at the end to move relative to each other until the ends of the two fixed half cylinders 21 abut against each other. The rubber sheet 212 on its inner wall will abut against the outer wall of the rock sample, thereby achieving the clamping and fixing of the rock sample. During this process, the deformation of the rubber sheet 212 can make the fixed half cylinder 21 fit tightly against the outer wall of the rock sample.

[0040] Then, the vertical hydraulic cylinder 25 can be controlled to extend. The extended vertical hydraulic cylinder 25 will drive the upper sealing plate 22 and the lower sealing plate 23 at the end to move. When the upper sealing plate 22 and the lower sealing plate 23 abut against the top and bottom of the fixed half cylinder 21 after docking, the end of the fixed half cylinder 21 can be sealed, so that the fixed half cylinder 21, the upper sealing plate 22 and the lower sealing plate 23 can form a chamber that wraps the rock sample.

[0041] During this process, by adjusting the height of the rock sample, when the bottom of the upper sealing plate 22 abuts against the top of the fixed half-cylinder 21, the gas injection head 223 located below the upper sealing plate 22 can smoothly abut against the top of the rock sample. Then, when the staff controls the external air pump to work, the gas will flow through the gas injection pipe 41 to the gas guide plate 4 and the transfer pipe 42. At this time, the staff can open the valve 421 on one of the transfer pipes 42 as needed, so that the gas can flow through the corresponding transfer pipe 42 to the corresponding gas injection head 223 below. Then, the gas can be injected into the rock sample through the gas injection head 223. Then, the gas pressure on the exhaust pipe 231 can be detected by the pressure transmitter on the exhaust pipe 231.

[0042] The above steps can then be repeated to open the valves 421 on multiple adapter pipes 42 in sequence for testing, thereby obtaining values ​​for multiple different gas injection positions and improving the comprehensiveness of experimental data.

[0043] The hydraulic cylinder in this invention is connected to a standard hydraulic system via an external pipeline to achieve its extension and retraction control. The specific setup of this hydraulic system is conventional technology in this field. In addition, the circuit involved in this invention is controlled by a PLC controller. The circuit and control involved are all existing technologies and will not be described in detail here.

[0044] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A rock permeability testing device, characterized in that, include: Mounting frame (1), the mounting frame (1) is provided with a fixing component (2) for holding rock samples; The fixing component (2) includes a fixing half-cylinder (21), which has two parts and is symmetrically distributed. A rubber sheet (212) that abuts against the outer wall of the rock sample is fixedly installed on the side wall of the fixing half-cylinder (21). An upper sealing plate (22) is provided at the top of the fixing half-cylinder (21) to seal the top of the fixing half-cylinder (21), and a lower sealing plate (23) is provided at the bottom of the fixing half-cylinder (21) to seal the bottom of the fixing half-cylinder (21). The top of the upper sealing plate (22) is provided with multiple mounting slots (221). A connecting pipe (222) is fixedly embedded inside the mounting slot (221). A communicating air injection head (223) is fixedly installed at the bottom end of the connecting pipe (222). A communicating adapter pipe (42) is fixedly installed at the top end of the connecting pipe (222). A valve (421) is fixedly installed on the adapter pipe (42). A rubber pad that abuts against the rock sample is fixedly installed at the end of the air injection head (223). The top of multiple adapter pipes (42) is fixedly installed with the same air guide plate (4), the interior of the air guide plate (4) is connected to the interior of the adapter pipe (42), and the top of the air guide plate (4) is fixedly installed with an air injection pipe (41) connected to its interior.

2. The rock permeability testing device according to claim 1, characterized in that, A support frame (3) is fixedly installed on the top of the lower sealing plate (23). A sliding frame (32) is inserted on the support frame (3), and a support ring (6) for supporting the rock sample is provided above the sliding frame (32).

3. The rock permeability testing device according to claim 2, characterized in that, Multiple telescopic rods (5) are fixedly installed between the support ring (6) and the sliding frame (32). A spring (51) is sleeved on the outside of the telescopic rod (5). The top end of the spring (51) is fixedly connected to the bottom of the support ring (6), and the bottom end of the spring (51) is fixedly connected to the top of the sliding frame (32).

4. The rock permeability testing device according to claim 3, characterized in that, The support frame (3) is fitted with a threaded adjusting rod (31), and the top of the adjusting rod (31) is rotatably connected to the inner top of the sliding frame (32).

5. The rock permeability testing device according to claim 1, characterized in that, Both the lower sealing disc (23) and the upper sealing disc (22) are fixedly installed with rubber rings (24) that abut against their ends on the side near the fixed half cylinder (21). An exhaust pipe (231) is fixedly installed at the bottom of the lower sealing disc (23), and a pressure transmitter for measuring the internal air pressure is provided on the exhaust pipe (231).

6. The rock permeability testing device according to claim 1, characterized in that, A vertical hydraulic cylinder (25) is fixedly installed between the lower sealing disc (23) and the upper sealing disc (22) and the mounting frame (1), and a horizontal hydraulic cylinder (211) is fixedly installed between the fixed half cylinder (21) and the mounting frame (1).

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