System and method for measuring permeability of low-permeability rock ore particles

Abstract

The invention relates to the technical field of permeability measurement, in particular to a permeability measuring system and method.The measuring system comprises a first cavity, a second cavity and a first pipeline, the first cavity and the second cavity are communicated through the first pipeline, a first air pressure sensor is arranged in the first cavity, and a second air pressure sensor is arranged in the second cavity; a second air pressure sensor is arranged in the second cavity, a first valve is arranged at the joint of the second cavity and the first pipeline, the first pipeline is sleeved with a second pipeline, a sealed detection cavity is formed between the first pipeline and the second pipeline, an air pressure sensing alarm device is arranged in the detection cavity, and the first cavity is connected with an air pump device. When the first pipeline leaks gas, the gas pressure sensing alarm device can detect the gas pressure change and give an alarm, and the damage condition of the pipeline can be found in time, so that an operator is reminded to replace or maintain the first pipeline, and the measurement accuracy of the low-permeability rock ore particles is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of permeability measurement, and more specifically, to a system and method for measuring the permeability of low-permeability rock and mineral particles. Background Art

[0002] There are many unconventional natural gas resources in the world today, including tight gas, coalbed methane and shale gas. These unconventional natural gas resources are the key exploration and development targets of natural gas technology. The reservoir rocks of unconventional natural gas reservoirs have extremely low porosity, and it is necessary to sample the rock particles for permeability measurement.

[0003] Existing measuring devices are usually connected by a chamber and a pipe. When the sample to be tested is placed in the chamber, a certain air pressure is introduced, and the permeability of the sample is calculated by changing the air pressure. However, during use, the pipe may be damaged or leaked. If it is not discovered in time, it will affect the accuracy of the measurement. Summary of the invention

[0004] In order to overcome the problem of inaccurate permeability measurement due to pipeline damage in the above-mentioned prior art, the present invention provides a permeability measurement system and method for low-permeability rock and mineral particles, which can promptly detect pipeline damage.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a permeability measurement system for low-permeability rock and mineral particles, comprising: a first cavity, a second cavity and a first pipeline, the first cavity and the second cavity are connected through the first pipeline, a first air pressure sensor is provided in the first cavity, a second air pressure sensor is provided in the second cavity, a first valve is provided at the connection between the second cavity and the first pipeline, a second pipeline is connected to the outer sleeve of the first pipeline, a sealed detection cavity is formed between the first pipeline and the second pipeline, an air pressure sensing alarm device is provided in the detection cavity, and the first cavity is connected to an air pump device.

[0006] In the technical solution of the present invention, the low-permeability rock and mineral particle sample is placed in the second cavity, and the air pump device can be used to evacuate or inject high-pressure gas into the first cavity, the second cavity and the first pipeline. The first sensor and the second sensor can detect the air pressure in the first cavity and the second cavity respectively, and the first valve can close the connection between the first cavity and the second cavity, so that different pressures are formed in the first cavity and the second cavity, and the permeability of the low-permeability rock and mineral particles is calculated and measured using the pressure changes in the first cavity and the second cavity. Since the second pipeline is provided on the outside of the first pipeline to form a sealed detection cavity, when gas leakage occurs in the first pipeline, the air pressure sensing alarm device can detect the air pressure change and alarm, and can timely discover the damage of the pipeline, thereby reminding the operator to replace or repair the first pipeline, thereby improving the measurement accuracy of the low-permeability rock and mineral particles.

[0007] Furthermore, the second pipe is a transparent structure, the outer side of the first pipe is sleeved with a detection component, the detection component includes a sponge layer, and the air pump device is used to inject moisture.

[0008] In this solution, when the sponge layer comes into contact with moisture, it will be soaked, and the changes in the sponge layer can be seen through the transparent second pipe, so that the first pipe can be discovered and replaced or repaired in time.

[0009] Furthermore, the detection component also includes a marking layer arranged on the outside of the sponge layer and capable of changing color when exposed to water.

[0010] In this solution, the marking layer can be filled with anhydrous copper sulfate, and the leakage site can be quickly located by observing the color change of the marking layer, so that the first pipeline can be replaced or repaired in time.

[0011] Furthermore, a magnet is slidably connected to the outer side of the second pipe, and a magnetic ring is slidably sealed on the outer side of the detection component.

[0012] In this solution, the magnetic ring can be driven to move from the outside of the second pipe by moving the magnet, so that the magnetic ring moves to the leakage position of the first pipe, which can play a role in auxiliary sealing.

[0013] Furthermore, the detection component also includes an absorption layer arranged between the sponge layer and the marking layer.

[0014] In this solution, the absorption layer can be filled with a desiccant, and part of the water vapor in the moisture can be absorbed by the absorption layer to prevent excessive water vapor from affecting the operation of the air pressure sensor and the air pressure sensing alarm device.

[0015] Furthermore, a plurality of groups of protrusions are fixedly connected to the outer side of the detection component.

[0016] In this solution, when the magnetic attraction ring moves to the leakage site, the magnetic attraction ring can abut against the protrusion and squeeze the sponge layer, thereby squeezing part of the water in the sponge layer to the absorption layer for absorption.

[0017] Furthermore, an adhesive cavity is provided inside the magnetic ring, glue is stored in the adhesive cavity, an opening is provided on the side of the adhesive cavity facing the first pipe, a sealing film is provided at the opening, and a puncturing mechanism for puncturing the sealing film is provided between the sponge layer and the marking layer.

[0018] In this solution, when the magnetic ring moves to the leaking part, the puncturing mechanism can puncture the sealing film, so that the glue in the adhesive cavity flows out, and the leaking part of the first pipeline is repaired.

[0019] Furthermore, the puncturing mechanism includes a water-swellable layer and a plurality of spikes disposed between the sponge layer and the marking layer, and each of the spikes is connected to the water-swellable layer and faces outward.

[0020] In this solution, moisture expands after contacting the water-swellable layer, causing the spikes to extend out of the marking layer, thereby being able to contact the sealing film of the magnetic attraction ring and pierce the sealing film to allow the glue to flow out.

[0021] Furthermore, the water-swellable layer is provided with a plurality of air holes in a radial direction.

[0022] In this solution, ventilation holes are provided to facilitate moisture to pass through the ventilation holes and contact the marking layer.

[0023] The present invention also provides a method for measuring the permeability of low-permeability rock and mineral particles, comprising the following steps:

[0024] S1: close the first valve and inject high-pressure gas into the first cavity through the air pump device. If the air pressure sensing alarm device detects an increase in air pressure and alarms, replace or repair the first pipeline;

[0025] S2: placing the low-permeability rock and mineral particle sample in the second cavity, opening the first valve, evacuating the system through the air pump device, and then injecting high-pressure gas into the system through the air pump device to increase the pressure to P1, closing the first valve, and continuing to inject high-pressure gas through the air pump device to increase the pressure to P2;

[0026] S3: Detecting the air pressure change curves in the first cavity and the second cavity through the first sensor and obtaining the permeability of the low-permeability rock and mineral particle sample through calculation.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The permeability measurement system of low-permeability rock and mineral particles of the present invention is provided with a second pipe on the outside of the first pipe to form a sealed detection chamber. When gas leakage occurs in the first pipe, the air pressure sensing alarm device can detect the air pressure change and alarm, and can timely discover the damage of the pipeline, thereby reminding the operator to replace or repair the first pipe, thereby improving the measurement accuracy of low-permeability rock and mineral particles.

[0029] 2. The method for measuring the permeability of low-permeability rock and mineral particles of the present invention can detect pipeline leakage before measurement, thereby improving the accuracy of the permeability measurement of low-permeability rock and mineral particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the permeability measurement system of low-permeability rock and mineral particles of the present invention;

[0031] Figure 2 is a cross-sectional view of the connection between the second cavity and the pipeline;

[0032] Figure 3 yes Figure 2 A magnified image of point A;

[0033] Figure 4 is a cross-sectional view of the detection component;

[0034] Figure 5 is a schematic diagram of the damaged state of the first pipeline;

[0035] Figure 6 It is a partial cross-sectional view of the magnetic ring.

[0036] In the accompanying drawings: 1. first cavity; 2. second cavity; 3. first pipe; 4. second pipe; 5. air pressure sensing alarm device; 6. detection component; 61. sponge layer; 62. marking layer; 63. absorption layer; 64. protrusion; 65. water-swelling layer; 651. air vent; 66. spikes; 7. magnet; 8. magnetic ring; 81. adhesive cavity; 82. sealing film; 9. sealing ring; 10. damaged area. DETAILED DESCRIPTION

[0037] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0040] Example 1

[0041] refer to Figures 1 to 6 The present embodiment discloses a permeability measurement system for low-permeability rock and mineral particles, comprising a first cavity 1, a second cavity 2 and a first pipe 3. The first cavity 1 and the second cavity 2 are connected through the first pipe 3. A first air pressure sensor is provided in the first cavity 1, a second air pressure sensor is provided in the second cavity 2, a first valve is provided at the connection between the second cavity 2 and the first pipe 3, a second pipe 4 is connected to the outer shell of the first pipe 3, a sealed detection cavity is formed between the first pipe 3 and the second pipe 4, an air pressure sensing alarm device 5 is provided in the detection cavity, and the first cavity 1 is connected to an air pump device.

[0042] In this embodiment, the low-permeability rock and mineral particle sample is placed in the second cavity 2, and the air pump device can be used to evacuate or inject high-pressure gas into the first cavity 1, the second cavity 2 and the first pipe 3. The air pressure in the first cavity 1 and the second cavity 2 can be detected by the first sensor and the second sensor respectively, and the connection between the first cavity 1 and the second cavity 2 can be closed by the first valve, so that different pressures are formed in the first cavity 1 and the second cavity 2, and the permeability of the low-permeability rock and mineral particles is calculated and measured by the pressure change of the first cavity 1 and the second cavity 2. Since the second pipe 4 is provided on the outside of the first pipe 3 to form a sealed detection cavity, when gas leakage occurs in the first pipe 3, the air pressure sensing alarm device 5 can detect the air pressure change and alarm, thereby reminding the operator to replace or repair the first pipe 3, thereby improving the measurement efficiency of low-permeability rock and mineral particles.

[0043] refer to Figure 1 and Figure 2Specifically, the first cavity 1 and the second cavity 2 can be cubic sealed containers respectively, and the interiors of the first cavity 1 and the second cavity 2 are connected through the first pipe 3, so that the gas can enter the second cavity 2 from the first cavity 1 through the first pipe 3. An air pump device (not shown in the figure) is connected to one end of the first cavity 1, and the air pump device is used to evacuate the first cavity 1, the first pipe 3 and the second cavity 2, and can inject gas. A first valve (not shown in the figure) is provided at the connection between the first pipe 3 and the second cavity 2, which can open or close the connection between the second cavity 2 and the first pipe 3. A sealing ring 9 is provided at the end between the first pipe 3 and the second pipe 4, so that the second pipe 4 is sleeved on the first pipe 3 to form a sealed detection cavity.

[0044] In some other embodiments, the measurement system may further include more cavities and pipeline connections, and the pipelines between the cavities are arranged the same as in this embodiment, so as to detect whether each pipeline is leaking.

[0045] In this embodiment, the second pipe 4 is a transparent structure, and a detection component 6 is sleeved on the outer side of the first pipe 3. The detection component 6 includes a sponge layer 61, and the air pump device can inject moisture. When the sponge layer 61 comes into contact with moisture, it will be soaked. The changes in the sponge layer 61 can be seen through the transparent second pipe 4, so that the first pipe 3 can be discovered and replaced or repaired in time. Among them, the second pipe 4 can be made of transparent materials, such as transparent plastic or glass. Moisture refers to air with a high moisture content, which can be obtained by humidifying the air. The sponge layer 61 is lighter in color when dry, and the sponge layer 61 will show a darker color after being soaked, which can be achieved by selecting a suitable sponge material.

[0046] In this embodiment, the detection component 6 also includes a marking layer 62 that changes color when exposed to water and is arranged on the outside of the sponge layer 61. The marking layer 62 can be filled with anhydrous copper sulfate, and the leakage site can be quickly located by observing the color change of the marking layer 62, so that the first pipeline 3 can be replaced or repaired in time.

[0047] Specifically, the marking layer 62 can be made of anhydrous copper sulfate particles wrapped with a breathable transparent material. For example, a fine porous transparent film is used to wrap the anhydrous copper sulfate particles, which is arranged around the outside of the sponge layer 61. The pore size of the porous film is smaller than the diameter of the particles, so that the particles will not fall out. When moisture leaks, it can contact the anhydrous copper sulfate particles through the porous transparent film, so that the anhydrous copper sulfate particles turn blue, so that the leakage position of the first pipeline 3 can be observed.

[0048] Example 2

[0049] refer to Figures 1 to 6This embodiment is similar to embodiment 1, except that in this embodiment, a magnet is slidably connected to the outer side of the second pipe, and a magnetic ring is slidably sealed on the outer side of the detection component. By moving the magnet, the magnetic ring can be driven to move from the outside of the second pipe, so that the magnetic ring moves to the damaged area of ​​the first pipe, which can play a role in auxiliary sealing. The magnetic ring can squeeze the detection component tightly against the outside of the first pipe, thereby reducing the leakage of the first pipe to a certain extent. The magnet can be annularly sleeved on the outside of the second pipe. The magnetic ring can be made of a material that can be attracted by a magnet, such as iron.

[0050] In this embodiment, the detection component further includes an absorption layer disposed between the sponge layer and the marking layer. The absorption layer may be filled with a desiccant, and the absorption layer can absorb part of the water vapor in the moisture to prevent excessive water vapor from affecting the operation of the air pressure sensor and the air pressure sensing alarm device.

[0051] refer to Figure 4 In this embodiment, a plurality of protrusions are fixedly connected to the outer side of the detection component. When the magnetic ring moves to the leaking part, the magnetic ring can contact with the protrusions and squeeze the sponge layer, thereby squeezing part of the water in the sponge layer to the absorption layer for absorption.

[0052] refer to Figure 3 and Figure 6 In this embodiment, an adhesive cavity is provided inside the magnetic ring, and glue is stored in the adhesive cavity. An opening is provided on the side of the adhesive cavity facing the first pipe, and a sealing film is provided at the opening. A puncturing mechanism for puncturing the sealing film is provided between the sponge layer and the marking layer. When the magnetic ring moves to the leaking part, the puncturing mechanism can puncture the sealing film, so that the glue in the adhesive cavity flows out, and the leaking part of the first pipe is repaired.

[0053] refer to Figure 4 More specifically, the puncturing mechanism includes a water-swelling layer and a plurality of spikes disposed between the sponge layer and the marking layer, each spike being connected to the water-swelling layer and facing outward. When moisture contacts the water-swelling layer, it expands, causing the spikes to extend out of the marking layer, thereby being able to contact the sealing film of the magnetic ring and puncture the sealing film to allow the glue to flow out.

[0054] refer to Figure 4 The water-expandable layer is provided with a plurality of air holes in the radial direction so that moisture can pass through the air holes and contact the marking layer. Of course, the absorbing layer can also be provided with a plurality of air holes in the radial direction so that some moisture can easily pass through the absorbing layer and contact the marking layer.

[0055] Example 3

[0056] This embodiment discloses a method for measuring the permeability of low-permeability rock and mineral particles, comprising the following steps:

[0057] S1: close the first valve and inject high-pressure gas into the first cavity through the air pump device. If the air pressure sensing alarm device detects an increase in air pressure and alarms, replace or repair the first pipeline;

[0058] S2: placing the low-permeability rock and mineral particle sample in the second cavity, opening the first valve, evacuating the system through the air pump device, and then injecting high-pressure gas into the system through the air pump device to increase the pressure to P1, closing the first valve, and continuing to inject high-pressure gas through the air pump device to increase the pressure to P2;

[0059] S3: Detecting the air pressure change curves in the first cavity and the second cavity through the first sensor and obtaining the permeability of the low-permeability rock and mineral particle sample through calculation.

[0060] In step S3, the specific calculation formula process can refer to Chinese patent CN107655805B. Of course, the measurement system structure adopted, such as the number of chambers, pipelines and valves, can also be adjusted with reference to the above patents, but the pipeline connection method between the chambers is set to the structure in Example 1 or Example 2 of the present invention. Through the measurement method of low-permeability rock and mineral particles in this embodiment, the leakage of the pipeline can be discovered in time before measurement, thereby avoiding excessive error in the result due to pipeline leakage.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A permeability measurement system for low-permeability rock and mineral particles, characterized in that: The invention comprises a first cavity (1), a second cavity (2) and a first pipe (3); the first cavity (1) and the second cavity (2) are connected via the first pipe (3); a first air pressure sensor is arranged in the first cavity (1); a second air pressure sensor is arranged in the second cavity (2); a first valve is arranged at the connection between the second cavity (2) and the first pipe (3); a second pipe (4) is connected to the outer shell of the first pipe (3); a sealed detection cavity is formed between the first pipe (3) and the second pipe (4); an air pressure sensing alarm device (5) is arranged in the detection cavity; and the first cavity (1) is connected to an air pump device.

2. The permeability measurement system of low-permeability rock and mineral particles according to claim 1, characterized in that: The second pipe (4) is a transparent structure. The outer side of the first pipe (3) is sleeved with a detection component (6), the detection component (6) comprises a sponge layer (61), and the air pump device is used for injecting moisture.

3. The permeability measurement system of low-permeability rock particles according to claim 2, characterized in that: The detection component (6) further comprises a marking layer (62) which is arranged on the outside of the sponge layer (61) and is capable of changing color when exposed to water.

4. The permeability measurement system of low-permeability rock particles according to claim 3 is characterized in that: The outer side of the second pipe (4) is slidably connected to a magnet (7), and the outer side of the detection component (6) is slidably sealed and sleeved with a magnetic attraction ring (8).

5. The permeability measurement system of low-permeability rock particles according to claim 4, characterized in that: The outer side of the detection component (6) is fixedly connected with a plurality of groups of protrusions (64).

6. The permeability measurement system of low-permeability rock and mineral particles according to claim 5, characterized in that: The magnetic ring (8) is provided with an adhesive cavity (81) inside, and glue is stored in the adhesive cavity (81). The adhesive cavity (81) is provided with an opening on a side facing the first pipe (3), and a sealing film (82) is provided at the opening. A piercing mechanism for piercing the sealing film (82) is provided between the sponge layer (61) and the marking layer (62).

7. The permeability measurement system of low-permeability rock particles according to claim 6, characterized in that: The puncturing mechanism comprises a water-swellable layer (65) and a plurality of spikes (66) arranged between the sponge layer (61) and the marking layer (62), wherein each of the spikes (66) is connected to the water-swellable layer (65) and faces outward.

8. The permeability measurement system of low-permeability rock particles according to claim 7, characterized in that: The water-expandable layer (65) is provided with a plurality of air holes (651) in the radial direction.

9. The permeability measurement system of low-permeability rock particles according to claim 3, characterized in that: The detection component (6) further comprises an absorption layer (63) arranged between the sponge layer (61) and the marking layer (62).

10. A method for measuring the permeability of low-permeability rock particles, using the measurement system according to any one of claims 1 to 9, comprising the following steps: S1: Close the first valve and inject high-pressure gas into the first cavity (1) through the air pump device. If the air pressure sensing alarm device (5) detects an increase in air pressure and sounds an alarm, the first pipeline (3) is replaced or repaired; S2: placing a low-permeability rock and mineral particle sample in the second cavity (2), opening the first valve, evacuating the system through the air pump device, and then injecting high-pressure gas into the system through the air pump device to increase the pressure to P1, closing the first valve, and continuing to inject high-pressure gas through the air pump device to increase the pressure to P2; S3: The air pressure variation curves in the first cavity (1) and the second cavity (2) are detected by the first sensor and the second sensor, and the permeability of the low-permeability rock and mineral particle sample is obtained by calculation.

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