A deep low-permeability coalbed methane permeability detection device

Abstract

The present invention discloses a deep low-permeability coalbed methane permeability detection device, which relates to the technical field of coalbed methane permeability detection, and comprises a support; a fluid control system fixed on the support and used to control the flow of gas; a detector fixed on the support and used to analyze the coalbed methane permeability in a coal sample; a temperature control system fixed on the side wall of the detector and used to control the temperature environment of the coal sample; a pressure control system fixed on the upper end face of the support and used to control the pressure applied to the coal sample; and a sampling assembly fixed on the upper end face of the support and connected to the fluid control system, the detector, the temperature control system and the pressure control system, and used to place the coal sample.

Description

Technical Field

[0001] The invention relates to the technical field of coal sample coalbed methane permeability detection, in particular to a deep low-permeability coalbed methane permeability detection device. Background Art

[0002] Coalbed methane is also known as coal seam gas (gas of coalseam) or coalbed methane. The mixed gas composed of methane, carbon dioxide and nitrogen that escapes from coal and surrounding rocks needs to be sampled first when testing the coalbed methane permeability in coal, and then the coal sample is placed in the detection device for pressurized testing. However, the sampling chamber (where the coal sample is placed) and the sampling equipment of the existing detection device are two parts, which means that the coal sample needs to be taken out after sampling and then placed in the sampling chamber for testing. However, when the coal sample is exposed to the air, the coalbed methane inside it will begin to escape, especially for deep coal samples, where the pressure is different from the surface pressure, resulting in the coalbed methane inside the coal sample beginning to penetrate when the coal sample is exposed to the air, which greatly affects the accuracy of the detection.

[0003] In view of the above problems, the present invention provides a deep low-permeability coalbed methane permeability detection device to solve the above problems. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a deep low-permeability coalbed methane permeability detection device, comprising:

[0005] Support;

[0006] A fluid control system, fixed on the support, for controlling the flow of the gas;

[0007] A detector, fixed on the support, for analyzing the coalbed methane permeability in the coal sample;

[0008] A temperature control system, fixed to the side wall of the detector, for controlling the temperature environment of the coal sample;

[0009] a pressure control system, fixed to the upper end surface of the support, for controlling the pressure applied to the coal sample; and

[0010] The sampling assembly is fixed on the upper end surface of the support and is connected with the fluid control system, the detector, the temperature control system and the pressure control system, and is used for placing the coal sample.

[0011] Further, preferably, the sampling component comprises:

[0012] The outer wall of the sampling chamber;

[0013] The inner wall of the sampling chamber is coaxially fixed inside the inner wall of the sampling chamber;

[0014] The end cover is fixed to the upper end surface of the outer wall of the sampling chamber, and the axial position fixing rod thereof has a detection port;

[0015] At least three connection ports are fixed to the side wall of the inner wall of the sampling chamber; and

[0016] The sealing component is fixed on the lower end surface of the outer wall of the sampling chamber and is connected to the external liquid supply device through a plurality of hoses.

[0017] Further, preferably, the closure assembly comprises:

[0018] A hydraulic plate is fixed to the lower end surface of the outer wall of the sampling chamber, and two hydraulic ports are fixed to the side wall thereof, and the hydraulic ports are connected to an external liquid supply device;

[0019] A driving plate, rotatably disposed inside the hydraulic plate;

[0020] A limit plate, fixed to the upper end surface of the hydraulic plate, and having a plurality of limit grooves obliquely opened inside the limit plate; and

[0021] The blocking plates are configured in multiple numbers and correspond to the limiting grooves, and are slidably arranged between the limiting plate and the driving plate.

[0022] Further, preferably, a liquid circulation chamber is provided inside the hydraulic disc, a partition block is fixed inside the liquid circulation chamber, and the partition block is located between the two hydraulic ports.

[0023] Further, preferably, a rotating block is fixed to the outer wall of the driving disk, and the rotating block is slidably arranged in the liquid circulation chamber. A feed port is provided in the middle position of the driving disk, and a sliding groove is provided on the upper end surface of the driving disk.

[0024] Further, preferably, a sliding block is fixed to one end of the lower end surface of the baffle plate, a liquid inlet is fixed to the upper end surface of the baffle plate, the liquid inlet is slidably arranged in a limiting groove, and the liquid inlet is connected to the hose, a cutting knife is slidably arranged on the side of the baffle plate close to the axial position of the driving disk, a closed groove is symmetrically opened on the side of the baffle plate located at the cutting knife, a closed strip is symmetrically fixed to the side of the baffle plate adjacent to the closed groove, and the closed strip can slide in the closed groove.

[0025] Compared with the prior art, the present invention provides a deep low-permeability coalbed methane permeability detection device, which has the following beneficial effects:

[0026] In the present invention, when the coalbed methane permeability is detected, firstly, the sampling assembly is installed in a special drill rod, and sampling is performed through the drill bit. After the sampling is completed, the coal sample is sealed in the sampling assembly to prevent the coal sample from contacting with the ground pressure, which may affect the detection result. Then, the sampling assembly is connected to the fluid control system, the detector, the temperature control system and the pressure control system, and then the temperature and pressure are adjusted to the same values ​​as those at the sampling point. Then, the connection port of the sampling assembly is opened to ensure that the coal sample is always in the environment of the sampling point, thereby greatly improving the accuracy of the coalbed methane permeability detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram of a deep low-permeability coalbed methane permeability detection device;

[0028] Figure 2 A schematic diagram of a sampling component of a deep low-permeability coalbed methane permeability detection device;

[0029] Figure 3 A schematic diagram of a closed component of a deep low-permeability coalbed methane permeability detection device;

[0030] Figure 4 This is a schematic diagram of the interior of a closed component of a deep low-permeability coalbed methane permeability detection device;

[0031] Figure 5 A schematic diagram of the working state of a sampling component of a deep low-permeability coalbed methane permeability detection device;

[0032] In the figure: 1. support; 2. fluid control system; 3. detector; 4. temperature control system; 5. pressure control system; 6. sampling assembly; 61. outer wall of sampling chamber; 62. inner wall of sampling chamber; 63. end cover; 64. detection port; 65. connection port; 66. closing assembly; 67. hose; 661. hydraulic disc; 662. hydraulic port; 663. drive disc; 664. limit disc; 665. limit groove; 666. baffle plate; 6611. liquid circulation chamber; 6612. partition block; 6631. sliding groove; 6632. rotating block; 6661. sliding block; 6662. liquid inlet; 6663. closing groove; 6664. closing strip; 6665. cutting knife. DETAILED DESCRIPTION

[0033] Reference Figures 1 to 5 The present invention provides a technical solution: a deep low-permeability coalbed methane permeability detection device, comprising:

[0034] Support 1;

[0035] A fluid control system 2, fixed on the support 1, for controlling the flow of gas;

[0036] A detector 3, fixed on the support 1, for analyzing the coalbed methane permeability in the coal sample;

[0037] A temperature control system 4, fixed on the side wall of the detector 3, for controlling the temperature environment of the coal sample;

[0038] A pressure control system 5, fixed to the upper end surface of the support 1, for controlling the pressure applied to the coal sample; and

[0039] The sampling assembly 6 is fixed on the upper end surface of the support 1 and is connected to the fluid control system 2, the detector 3, the temperature control system 4 and the pressure control system 5, and is used for placing coal samples.

[0040] It should be noted that when sampling before testing, the sampling assembly 6 of the device is installed in a dedicated drill rod, and sampling is performed through the drill bit to prevent external factors from affecting the test results.

[0041] In this embodiment, the sampling component 6 includes:

[0042] The outer wall of the sampling chamber 61;

[0043] The inner wall 62 of the sampling chamber is coaxially fixed inside the inner wall 61 of the sampling chamber;

[0044] The end cover 63 is fixed to the upper end surface of the outer wall 61 of the sampling chamber, and the axial position of the fixed rod has a detection port 64;

[0045] At least three connection ports 65 are fixed on the side wall of the inner wall 62 of the sampling chamber; and

[0046] The sealing component 66 is fixed to the lower end surface of the outer wall 61 of the sampling chamber, and is connected to the external liquid supply device through a plurality of hoses 67 .

[0047] As a preferred embodiment, the closure assembly 66 includes:

[0048] A hydraulic plate 661 is fixed to the lower end surface of the outer wall 61 of the sampling chamber, and two hydraulic ports 662 are fixed to its side wall, and the hydraulic ports 662 are connected to an external liquid supply device;

[0049] A driving disk 663 rotatably disposed inside the hydraulic disk 661;

[0050] A limiting plate 664 is fixed to the upper end surface of the hydraulic plate 661 and has a plurality of limiting grooves 665 obliquely opened inside the limiting plate 664; and

[0051] The blocking plates 666 are configured in multiple numbers and correspond to the limiting grooves 665 , and are slidably disposed between the limiting plate 664 and the driving plate 663 .

[0052] That is to say, during sampling, the coal sample is delivered into the inner wall 62 of the sampling chamber through the drill bit. When the sampling amount is reached, the driving disk 663 is driven to rotate by the hydraulic disk 661, so that the blocking plate 666 slides along the limiting groove 665, thereby performing an opening and closing action to complete sampling and sealing.

[0053] It should be noted that the number of blocking plates 666 in the present device is six.

[0054] As a preferred embodiment, a liquid circulation chamber 6611 is provided inside the hydraulic disc 661 , a partition block 6612 is fixed inside the liquid circulation chamber 6611 , and the partition block 6612 is located between the two hydraulic ports 662 .

[0055] As a preferred embodiment, a rotating block 6632 is fixed to the outer wall of the driving disk 663, and the rotating block 6632 is slidably arranged in the liquid circulation bin 6611. A feed port is provided in the middle position of the driving disk 663, and a sliding groove 6631 is provided on the upper end surface of the driving disk 663.

[0056] It should be noted that the sliding groove 6631 is hexagonal, and when the driving disk 663 rotates, the blocking plate 666 is pushed by the sliding groove 6631, thereby performing an opening and closing action.

[0057] As a preferred embodiment, a sliding block 6661 is fixed to one end of the lower end surface of the blocking plate 666, and a liquid inlet 6662 is fixed to the upper end surface of the blocking plate 666. The liquid inlet 6662 is slidably set in the limiting groove 665, and the liquid inlet 6662 is connected to the hose 67. A cutting knife 6665 is slidably set on the side of the blocking plate 666 close to the axial position of the driving disk 663. The blocking plate 666 is symmetrically provided with a closed groove 6663 on one side of the cutting knife 6665, and a closed strip 6664 is symmetrically fixed to the side of the blocking plate 666 adjacent to the closed groove 6663, and the closed strip 6664 can slide in the closed groove 6663.

[0058] The length of the cutting blade 6665 is one third of the side wall of the blocking plate 666;

[0059] It should be noted that when sampling is carried out, the baffle plate 666 is in an open state, allowing deep gas to enter the inner wall 62 of the sampling chamber, ensuring that the inner wall 62 of the sampling chamber is consistent with the environment of the sampling point. When the coal sample enters the inner wall 62 of the sampling chamber, the driving disk 663 is rotated to make the baffle plate 666 contact the outer wall of the coal sample, and then the cutting knife 6665 is made to slide back and forth through the liquid inlet 6662, thereby assisting the baffle plate 666 to cut the coal sample. After the cutting is completed, the inner wall 62 of the sampling chamber is closed by the baffle plate 666, so that the coal sample is always in the environment of the sampling point, thereby improving the accuracy of the detection.

[0060] Specifically, when testing the coalbed methane permeability, first install the sampling assembly 6 into a special drill rod and perform sampling through the drill bit. After sampling, seal the coal sample in the sampling assembly 6 to prevent the coal sample from contacting the ground pressure and affecting the test results. Then connect the sampling assembly 6 to the fluid control system 2, the detector 3, the temperature control system 4 and the pressure control system 5, adjust the temperature and pressure to the same values ​​as those at the sampling point, and then open the connection port 65 of the sampling assembly 6 to ensure that the coal sample is always in the environment of the sampling point, thereby greatly improving the accuracy of coalbed methane permeability detection.

[0061] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A deep low-permeability coalbed methane permeability detection device, characterized in that: include: Support (1); A fluid control system (2), fixed on the support (1), and used to control the flow of gas; A detector (3) fixed on the support (1) and used for analyzing the coalbed methane permeability in the coal sample; A temperature control system (4), fixed to the side wall of the detector (3), and used to control the temperature environment of the coal sample; A pressure control system (5), fixed to the upper end surface of the support (1), for controlling the pressure applied to the coal sample; and A sampling assembly (6) is fixed to the upper end surface of the support (1) and is connected to the fluid control system (2), the detector (3), the temperature control system (4) and the pressure control system (5), and is used for placing coal samples; The sampling component (6) comprises: The outer wall of the sampling chamber (61); The inner wall (62) of the sampling chamber is coaxially fixed inside the outer wall (61) of the sampling chamber; An end cover (63) is fixed to the upper end surface of the outer wall (61) of the sampling chamber, and a detection port (64) is fixed at the axial center position thereof; At least three connection ports (65) are fixed on the side wall of the inner wall (62) of the sampling chamber; and A sealing component (66) is fixed to the lower end surface of the outer wall (61) of the sampling chamber and is connected to an external liquid supply device via a plurality of hoses (67); The closure assembly (66) comprises: A hydraulic plate (661) is fixed to the lower end surface of the outer wall (61) of the sampling chamber, and two hydraulic ports (662) are fixed to its side wall, wherein the hydraulic ports (662) are connected to an external liquid supply device; A driving disk (663) rotatably disposed inside the hydraulic disk (661); A limiting plate (664) is fixed to the upper end surface of the hydraulic plate (661) and has a plurality of limiting grooves (665) obliquely opened inside the limiting plate; and The blocking plates (666) are configured in multiple numbers and correspond to the limiting grooves (665), and are slidably disposed between the limiting disk (664) and the driving disk (663).

2. A deep low-permeability coalbed methane permeability detection device according to claim 1, characterized in that: A liquid circulation chamber (6611) is provided inside the hydraulic disc (661), a partition block (6612) is fixed inside the liquid circulation chamber (6611), and the partition block (6612) is located between the two hydraulic ports (662).

3. A deep low-permeability coalbed methane permeability detection device according to claim 2, characterized in that: A rotating block (6632) is fixed to the outer wall of the driving disk (663), and the rotating block (6632) is slidably arranged in the liquid circulation chamber (6611). A feed port is provided at the middle position of the driving disk (663), and a sliding groove (6631) is provided on the upper end surface of the driving disk (663).

4. A deep low-permeability coalbed methane permeability detection device according to claim 1, characterized in that: A sliding block (6661) is fixed to one end of the lower end surface of the blocking plate (666), and a liquid inlet (6662) is fixed to the upper end surface of the blocking plate (666). The liquid inlet (6662) is slidably arranged in the limiting groove (665), and the liquid inlet (6662) is connected to the hose (67). A cutting knife (6665) is slidably arranged on the side of the blocking plate (666) close to the axial position of the driving disk (663). A closed groove (6663) is symmetrically provided on the side of the blocking plate (666) located on the cutting knife (6665). A closed strip (6664) is symmetrically fixed to the side of the blocking plate (666) adjacent to the closed groove (6663), and the closed strip (6664) can slide in the closed groove (6663).

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