Rock permeability measuring mechanism

Abstract

The utility model relates to the technical field of permeability determination, in particular to a rock permeability determination mechanism which comprises a bottom plate, sliding rails fixedly connected to the top ends of the left side and the right side of the bottom plate, a fixing plate fixedly connected to the top ends of the sliding rails, a first electric push rod fixedly connected to the middle of the bottom end of the fixing plate, and a first testing cylinder fixedly connected to the bottom end of the first electric push rod. The top end of the bottom plate is fixedly connected with a second test cylinder, the top end of the second test cylinder is provided with a gasket, the upper part in the second test cylinder is fixedly connected with an air bag, and the front end of the air bag is fixedly connected with an air pipe; through design cooperation, after a rock sample is put into the second test cylinder, the first electric push rod is started and extends, the first test cylinder and the second test cylinder can be closed, after an experiment is finished, the first electric push rod is started and contracts, the first test cylinder and the second test cylinder can be separated, the time needed for disassembling and assembling the rock sample is shortened, and the test efficiency is improved. The experiment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of permeability measurement, in particular to a rock permeability measurement mechanism. Background Art

[0002] Rock permeability refers to the ability of a rock to allow fluid to pass through under a certain pressure difference. It is an important index to measure the ability of a rock to allow fluid to pass through its pores or fractures, and is of great significance for fields such as oil and gas field development.

[0003] The patent specification with the publication number CN215493033U discloses a rock permeability measurement device, "including a fluid supply element, a test cylinder, a first filling element, and a first fluid receiving element. The first filling element is made of a flexible material. The first filling element is installed on the inner wall of the test cylinder and can deform after being filled with fluid and is used to clamp the rock sample. The first filling element is arranged around the outer wall of the rock sample and completely covers the outer wall of the rock sample. The fluid supply element can introduce fluid into the test cylinder. The first filling element does not contact the outer wall of the rock sample perpendicular to the fluid movement direction. The first fluid receiving element is communicated with one end of the test cylinder far from the fluid supply element, and the first fluid receiving element is used to collect and measure the flow rate of the fluid passing through the rock sample. This rock permeability measurement device can improve the accuracy of the rock permeability measurement result."

[0004] However, it is found in the implementation of the related technology that the above rock permeability measurement device has the following problems: When putting the rock sample into the test cylinder before the test, it is necessary to disassemble the relevant components of the test cylinder to put the rock sample in. Similarly, after the experiment, it is not convenient to take out the rock sample. However, the relevant process is relatively cumbersome, which prolongs the unnecessary experimental time. In view of this, a rock permeability measurement mechanism is provided to overcome the above defects. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies existing in the prior art and propose a rock permeability measurement mechanism.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: A rock permeability measurement mechanism includes a bottom plate. The top ends of the left and right sides of the bottom plate are fixedly connected with slide rails. The top ends of the slide rails are fixedly connected with fixing plates. The middle of the bottom end of the fixing plate is fixedly connected with a first electric push rod. The bottom end of the first electric push rod is fixedly connected with a first test cylinder. The top end of the bottom plate is fixedly connected with a second test cylinder. A gasket is provided at the top end of the second test cylinder. An airbag is fixedly connected above the interior of the second test cylinder. A trachea is fixedly connected to the front end of the airbag.

[0007] As a further description of the above technical solution: The outer end face of the first test cylinder is slidably connected to the inner sides of the two slide rails. The left and right sides of the outer end face of the second test cylinder are fixedly connected to the lower inner sides of the slide rails. The outer side of the rear end of the air pipe contacts the front end of the second test cylinder. Through the designed cooperation, after the rock sample is placed in the second test cylinder, the first electric push rod is started. When the first electric push rod extends, the first test cylinder and the second test cylinder can be closed. After the experiment is over, the first electric push rod is started. When the first electric push rod contracts, the first test cylinder and the second test cylinder can be separated, reducing the time required for disassembling and installing the rock sample and improving the experimental efficiency.

[0008] As a further description of the above technical solution: The left and right sides of the first test cylinder are provided with strip-shaped protrusions, and the strip-shaped protrusions of the first test cylinder are closely attached to the inner wall of the slide rail, so that the first test cylinder can only move along the slide rail, avoiding the situation that the first test cylinder cannot be completely closed with the second test cylinder due to external factors, resulting in poor airtightness of the device.

[0009] As a further description of the above technical solution: The bottom end of the first test cylinder and the top end of the second test cylinder are provided with annular grooves, and the shape of the annular grooves is consistent with the cross-section of the gasket, so that there is no slippage during the contact process between the first test cylinder and the second test cylinder, ensuring the overall airtightness of the device.

[0010] As a further description of the above technical solution: The front end of the second test cylinder is provided with a circular air hole, and the circular air hole of the second test cylinder is consistent with the outer diameter of the air pipe. The air pipe is fixedly penetrated through the air hole and fixedly connected to the airbag, so that the device can inflate the airbag through the air pipe to clamp the rock sample.

[0011] As a further description of the above technical solution: A second electric push rod is fixedly connected to the top end inside the first test cylinder. The bottom end of the second electric push rod is fixedly connected to a piston. The right side of the top end of the piston is fixedly connected to a water seepage inlet pipe. A rubber gasket is fixedly connected to the middle inside the second test cylinder. The bottom end of the rubber gasket is fixedly connected to a water seepage outlet pipe. The outer side of the piston is slidably connected to the inner side of the first test cylinder. The top end of the rubber gasket contacts the bottom end of the airbag. The upper outer end face of the water seepage inlet pipe contacts the top end of the first test cylinder. The front side of the water seepage outlet pipe contacts the front end of the second test cylinder, so that the device can ensure airtightness through the piston and the rubber gasket. By driving the piston to move through the second electric push rod, the pressure difference between the upper and lower sides of the rock sample can be rapidly increased, shortening the time required for the experiment.

[0012] As a further description of the above technical solution: The diameter of the piston is consistent with the inner diameter of the first test cylinder, and the diameter of the rubber gasket is consistent with the inner diameter of the second test cylinder, ensuring the airtightness of the device. When the piston moves under the action of the second electric push rod, an air pressure difference can be quickly generated, shortening the time required for the experiment.

[0013] The utility model has the following beneficial effects:

[0014] A rock permeability measuring mechanism designed by the utility model, through design cooperation, after a rock sample is placed into the second test cylinder, the first electric push rod is started, and when the first electric push rod extends, the first test cylinder and the second test cylinder can be closed. After the experiment is over, the first electric push rod is started, and when the first electric push rod contracts, the first test cylinder and the second test cylinder can be separated, reducing the time required for disassembling and assembling the rock sample and improving the experimental efficiency.

[0015] A rock permeability measuring mechanism designed by the utility model, through design cooperation, enables the device to ensure airtightness through a piston and a rubber gasket, and drives the piston to move through the second electric push rod, so that the pressure difference between the upper and lower sides of the rock sample can increase rapidly, shortening the time required for the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 is a schematic diagram of the longitudinal sectional structure of the first test cylinder of the utility model;

[0018] Figure 3 is a schematic diagram of the longitudinal sectional structure of the second test cylinder of the utility model;

[0019] Figure 4 is a schematic diagram of the structure of the second test cylinder of the utility model.

[0020] Legend:

[0021] 1. Bottom plate; 2. Slide rail; 3. Fixed plate; 4. First electric push rod; 5. First test cylinder; 6. Second test cylinder; 7. Washer; 8. Airbag; 9. Rubber gasket; 10. Air pipe; 11. Second electric push rod; 12. Piston; 13. Water seepage inlet pipe; 14. Water seepage outlet pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Referring to Figures 1 to 4 , a rock permeability measuring mechanism provided by the utility model includes a bottom plate 1. Slide rails 2 are welded and fixed to the top ends of the left and right sides of the bottom plate 1. The top ends of the slide rails 2 are welded and fixed to the bottom end of a fixed plate 3. The middle of the bottom end of the fixed plate 3 is fixed with a first electric push rod 4 through bolts. The bottom end of the first electric push rod 4 is fixed with a first test cylinder 5 through bolts. The second test cylinder 6 is fixed to the top end of the bottom plate 1 through bolts. A washer 7 is arranged at the top end of the second test cylinder 6. An airbag 8 is fixed above the inside of the second test cylinder 6 through a clamp. The front end of the airbag 8 is fixed to an air pipe 10 through a clamp.

[0023] As a further implementation of the above technical solution: The outer end face of the first test cylinder 5 is slidably connected to the inner sides of the two slide rails 2. The left and right sides of the outer end face of the second test cylinder 6 are fixed to the lower part of the inner sides of the slide rails 2 by bolts. The outer side face of the rear end of the air pipe 10 is in contact with the front end of the second test cylinder 6. Through the designed cooperation, after the rock sample is placed in the second test cylinder 6, the first electric push rod 4 is started. When the first electric push rod 4 extends, the first test cylinder 5 and the second test cylinder 6 can be closed. After the experiment is over, the first electric push rod 4 is started, and when the first electric push rod contracts, the first test cylinder 5 and the second test cylinder 6 can be separated, reducing the time required for disassembling and assembling the rock sample and improving the experimental efficiency.

[0024] As a further implementation of the above technical solution: The left and right sides of the first test cylinder 5 are provided with strip-shaped protrusions, and the strip-shaped protrusions of the first test cylinder 5 are closely attached to the inner wall of the slide rail 2, so that the first test cylinder 5 can only move along the slide rail 2, avoiding the situation that the first test cylinder 5 cannot be completely closed with the second test cylinder 6 due to external factors, resulting in poor airtightness of the device.

[0025] As a further implementation of the above technical solution: The bottom end of the first test cylinder 5 and the top end of the second test cylinder 6 are provided with annular grooves, and the shape of the annular groove is the same as the cross-section of the gasket 7, so that there is no slippage during the contact process between the first test cylinder 5 and the second test cylinder 6, ensuring the overall airtightness of the device.

[0026] As a further implementation of the above technical solution: The front end of the second test cylinder 6 is provided with a circular air hole, and the circular air hole of the second test cylinder 6 is the same as the outer diameter of the air pipe 10. The air pipe 10 is fixedly penetrated through the air hole and fixedly connected to the airbag 8, so that the device can inflate the airbag 8 through the air pipe 10 to clamp the rock sample.

[0027] As a further implementation of the above technical solution: The second electric push rod 11 is fixed to the top end inside the first test cylinder 5 by bolts. The bottom end of the second electric push rod 11 is fixed to the piston 12 by bolts. The right side of the top end of the piston 12 is fixed to the water seepage inlet pipe 13 by a clamp. The rubber gasket 9 is fixed to the middle inside the second test cylinder 6 by bolts. The bottom end of the rubber gasket 9 is fixed to the water seepage outlet pipe 14 by a clamp. The outer side face of the piston 12 is slidably connected to the inner side face of the first test cylinder 5. The top end of the rubber gasket 9 is in contact with the bottom end of the airbag 8. The upper side outer end face of the water seepage inlet pipe 13 is in contact with the top end of the first test cylinder 5. The front side of the water seepage outlet pipe 14 is in contact with the front end of the second test cylinder 6, so that the device can ensure airtightness through the piston 12 and the rubber gasket 9. By driving the piston 12 to move through the second electric push rod 11, the pressure difference between the upper and lower sides of the rock sample can be rapidly increased, shortening the time required for the experiment.

[0028] As a further implementation of the above technical solution: the diameter of the piston 12 is the same as the inner diameter of the first test cylinder 5, and the diameter of the rubber gasket 9 is the same as the inner diameter of the second test cylinder 6, ensuring the airtightness of the device, so that during the movement of the piston 12 under the action of the second electric push rod 11, an air pressure difference can be quickly generated, shortening the time required for the experiment.

[0029] During specific implementation: before use, fix the bottom plate 1 on a horizontal plane, place the rock sample into the second test cylinder 6, start the first electric push rod 4, the first electric push rod 4 extends, and since the first electric push rod 4 is fixedly connected to the fixing plate 3, the first test cylinder 5 slides downward along the slide rail 2 and fits with the second test cylinder 6. Since there is a washer 7 at the top of the second test cylinder 6, the friction during the contact between the first test cylinder 5 and the second test cylinder 6 is reduced, and the overall airtightness is ensured. Inflate the airbag 8 through the air pipe 10, the airbag 8 expands and clamps the rock sample, close the water inlet pipe 13 and the water outlet pipe 14, so that the piston 12 and the rubber gasket 9 form a sealed space between the first test cylinder 5 and the second test cylinder 6. Start the second electric push rod 11 to drive the piston 12 to move up and down, so that the air pressure in the sealed space will change during the movement of the piston 12, forming a relatively stable air pressure difference at both ends of the rock. Pass water through the water inlet pipe 13 and measure the water flowing out of the water outlet pipe 14. The rock permeability can be obtained through calculation. After the experiment, release the gas in the airbag 8 and start the first electric push rod 4 to contract the push rod, and the rock sample can be taken out from the second test cylinder 6.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rock permeability measurement mechanism, comprising a bottom plate (1), characterized in that: On the top ends of the left and right sides of the bottom plate (1), slide rails (2) are fixedly connected. On the top ends of the slide rails (2), a fixing plate (3) is fixedly connected. In the middle of the bottom end of the fixing plate (3), a first electric push rod (4) is fixedly connected. At the bottom end of the first electric push rod (4), a first test cylinder (5) is fixedly connected. On the top end of the bottom plate (1), a second test cylinder (6) is fixedly connected. On the top end of the second test cylinder (6), a washer (7) is provided. Above the inside of the second test cylinder (6), an airbag (8) is fixedly connected. At the front end of the airbag (8), an air tube (10) is fixedly connected.

2. The rock permeability measurement mechanism according to claim 1, characterized in that: The outer end face of the first test cylinder (5) is slidably connected to the inner sides of the two slide rails (2). The left and right sides of the outer end face of the second test cylinder (6) are fixedly connected to the lower sides of the inner sides of the slide rails (2). The outer side face of the rear end of the air tube (10) contacts the front end of the second test cylinder (6).

3. The rock permeability measurement mechanism according to claim 1, characterized in that: On the left and right sides of the first test cylinder (5), strip-shaped protrusions are provided, and the strip-shaped protrusions of the first test cylinder (5) are closely attached to the inner walls of the slide rails (2).

4. A rock permeability measurement mechanism according to claim 1, characterized in that: At the bottom end of the first test cylinder (5) and the top end of the second test cylinder (6), annular grooves are provided, and the shape of the annular grooves is the same as the cross-section of the washer (7).

5. A rock permeability measurement mechanism according to claim 1, characterized in that: At the front end of the second test cylinder (6), a circular air hole is provided, and the diameter of the circular air hole of the second test cylinder (6) is the same as the outer diameter of the air tube (10). The air tube (10) is fixedly penetrated through the air hole and fixedly connected to the airbag (8).

6. The rock permeability measurement mechanism according to claim 1, wherein: At the top end inside the first test cylinder (5), a second electric push rod (11) is fixedly connected. At the bottom end of the second electric push rod (11), a piston (12) is fixedly connected. On the right side of the top end of the piston (12), a water seepage inlet pipe (13) is fixedly connected. In the middle inside the second test cylinder (6), a rubber gasket (9) is fixedly connected. At the bottom end of the rubber gasket (9), a water seepage outlet pipe (14) is fixedly connected. The outer side face of the piston (12) is slidably connected to the inner side face of the first test cylinder (5). The top end of the rubber gasket (9) contacts the bottom end of the airbag (8). The outer side face of the upper side of the water seepage inlet pipe (13) contacts the top end of the first test cylinder (5). The front side of the water seepage outlet pipe (14) contacts the front end of the second test cylinder (6).

7. A rock permeability measurement mechanism according to claim 6, characterized in that: The diameter of the piston (12) is the same as the inner diameter of the first test cylinder (5). The diameter of the rubber gasket (9) is the same as the inner diameter of the second test cylinder (6).

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