Automatic drainage device for upward drilling and method for measuring coal seam gas pressure

Abstract

The application discloses an automatic uplink borehole water drainage device and a coal seam gas pressure measuring method, which comprises a measuring pipe, a sealing assembly, a connecting pipe and a floating ball assembly. The measuring pipe is arranged in the uplink borehole. The sealing assembly is arranged between the uplink borehole and the measuring pipe to seal the gap between the inner wall of the uplink borehole and the outer wall of the measuring pipe. One end of the connecting pipe is connected with the lower end of the measuring pipe, and a flow channel is formed between the measuring pipe and the connecting pipe. The other end of the connecting pipe is open upward. The middle part of the connecting pipe has a U-shaped sealing section which is used to fill fluid medium to block the lower end of the connecting pipe. The floating ball assembly is located on the side of the sealing section close to the measuring pipe and is arranged in the flow channel. The floating ball assembly has an open state and a closed state. When water in the measuring pipe flows to the connecting pipe, the floating ball assembly is in the open state to make the flow channel conductive. When there is no water in the measuring pipe, the floating ball assembly is in the closed state to make the flow channel disconnected.

Description

Technical Field

[0001] This invention belongs to the field of coal mining technology, specifically relating to an automatic drainage device for upward drilling and a method for measuring coal seam gas pressure. Background Technology

[0002] Coal seam gas pressure is a crucial parameter in coal mine gas control and a key indicator for assessing the risk of coal seam gas outbursts. In direct underground coal seam gas pressure measurement methods, water accumulation in some of the upward borehole pressure measuring pipes during the measurement process can affect the results. After the measurement is completed, the amount of water released from the borehole should be measured when removing the gauge head, and corrections should be made based on the released water volume and borehole parameters. Inaccurate measurements of water volume or weight can be due to factors such as the operator's experience and the availability of tools, ultimately leading to poor accuracy in coal seam gas pressure measurements and significantly impacting the guidance of subsequent construction operations. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose an automatic drainage device for upward drilling that can automatically drain water accumulated in a gas pressure measuring pipe hole.

[0005] An embodiment of the present invention also proposes a method for measuring coal seam gas pressure.

[0006] The automatic drainage device for upward drilling according to an embodiment of the present invention includes:

[0007] A measuring tube, which is arranged in the upward borehole;

[0008] A sealing assembly is disposed between the ascending borehole and the measuring tube to seal the gap between the inner wall of the ascending borehole and the outer wall of the measuring tube;

[0009] A connecting tube, one end of which is connected to the lower end of the measuring tube, forming a flow channel between the measuring tube and the connecting tube, the other end of which is open upwards, and the middle of the connecting tube having a U-shaped sealing section, which is used to fill the fluid medium to seal the lower end of the connecting tube;

[0010] A float assembly is located on the side of the sealed section near the measuring tube. The float assembly is disposed between the measuring tube and the connecting tube, or disposed within the flow channel. The float assembly has an open state and a closed state. When water flows from the measuring tube to the connecting tube, the float assembly is in the open state to open the flow channel. When there is no water in the measuring tube, the float assembly is in the closed state to disconnect the flow channel.

[0011] The automatic drainage device for upward drilling in this embodiment of the invention automatically discharges accumulated water, ensuring the accuracy of measurement results and avoiding inaccurate gas pressure measurement due to water accumulation, as well as inaccurate pressure correction due to inaccurate water discharge measurement.

[0012] In some embodiments, the float assembly includes:

[0013] A cylindrical body having an inner cavity, the cylindrical body being connected between the measuring tube and the connecting tube, or the outer wall of the cylindrical body being sealed to the inner wall of the flow channel, the inner cavity being in communication with the flow channel, and the cross-sectional dimensions of the inner cavity gradually decreasing from the middle to both ends;

[0014] A float is disposed in the inner cavity and can move up and down in the inner cavity. The outer diameter of the float is larger than the opening size at both ends of the inner cavity.

[0015] In some embodiments, annular grooves are provided on the cylindrical wall surfaces at both ends of the inner cavity, and sealing rings are provided in the annular grooves.

[0016] In some embodiments, the upper port size of the cavity is larger than the lower port size of the cavity.

[0017] In some embodiments, an intermediate pipe is provided between the measuring pipe and the connecting pipe, and the connecting pipe is suspended on a circumferential structure;

[0018] And / or, the sealed section is filled with water or emulsion.

[0019] In some embodiments, a pressure gauge is also included, located on the side of the float assembly away from the sealing section, and the pressure gauge is connected to the flow channel to detect the pressure within the flow channel.

[0020] In some embodiments, the end of the connecting tube near the measuring tube has a first connecting port and a second connecting port, the first connecting port being connected to the measuring tube and the second connecting port being connected to the pressure gauge, and the float assembly being located inside the connecting tube.

[0021] In some embodiments, the port at the end of the connecting tube furthest from the measuring tube is at a vertical height lower than the height of the lower port of the float assembly.

[0022] In some embodiments, a sieve tube is further included, which is connected to the end of the measuring tube away from the connecting tube, and the sieve tube is used to filter fluid flowing into the measuring tube.

[0023] The method for measuring coal seam gas pressure according to an embodiment of the present invention includes the following steps:

[0024] Drilling upward boreholes in the coal seam for measuring coal seam gas pressure;

[0025] An automatic drainage device for the upward borehole, as described in any of the above embodiments, is arranged in the upward borehole.

[0026] The sealed section of the automatic drainage device for the upward drilling is filled with a fluid medium to isolate the inner cavity of the upward drilling from the outside atmosphere.

[0027] The gas pressure parameters inside the upward borehole are obtained in real time using the pressure gauge in the automatic drainage device for the upward borehole.

[0028] When water flows out of the upward borehole, the water in the upward borehole can be automatically discharged through the upward borehole automatic drainage device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an automatic drainage device for upward drilling according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the connecting pipe and float assembly according to an embodiment of the present invention.

[0031] Figure 3 This is a flowchart of the coal seam gas pressure measurement method according to an embodiment of the present invention.

[0032] Figure label:

[0033] 1. Measuring tube; 11. Sieve tube;

[0034] 2. Sealing assembly; 21. First bladder bag; 22. Second bladder bag; 23. Grouting pipe;

[0035] 3. Connecting pipe; 31. Sealed section; 32. First connecting port; 33. Second connecting port;

[0036] 4. Float assembly; 41. Cylinder; 42. Float; 43. Upper port; 44. Lower port;

[0037] 5. Pressure gauge;

[0038] 6. Drilling upwards. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] like Figure 1 and Figure 2 As shown, the automatic drainage device for upward drilling in this embodiment of the invention includes a measuring pipe 1, a sealing assembly 2, a connecting pipe 3, and a float assembly 4.

[0041] In this borehole, the opening of the upward borehole 6 faces downward, and the borehole extends vertically from bottom to top or inclined upward. When water accumulates inside the borehole, it can flow out from the opening along the borehole wall of the upward borehole 6. A measuring tube 1 is arranged within the upward borehole 6, and a sealing assembly 2 is located between the upward borehole 6 and the measuring tube 1 to seal the gap between the inner wall of the upward borehole 6 and the outer wall of the measuring tube 1. It should be understood that a large section of the measuring tube 1 extends into the upward borehole 6. To ensure a seal between the outer wall of the measuring tube 1 and the borehole wall of the upward borehole 6, a sealing assembly 2 can be installed between the measuring tube 1 and the upward borehole 6 to achieve a blockage, ensuring that water and gas inside the upward borehole 6 are connected to the inner cavity of the measuring tube 1.

[0042] One end of the connecting pipe 3 is connected to the lower end of the measuring pipe 1, forming a flow channel between the measuring pipe 1 and the connecting pipe 3. The other end of the connecting pipe 3 is open upwards. The middle of the connecting pipe 3 has a U-shaped sealing section 31, which is used to fill fluid medium to seal the lower end of the connecting pipe 3. After the connecting pipe 3 and the measuring pipe 1 are connected, water in the borehole can flow out from the flow channel. However, because the connecting pipe 3 has a U-shaped sealing section 31, some water will remain in the sealing section 31 to seal the flow channel and prevent gas from escaping. When no water flows out of the borehole, water or other fluid medium can be actively filled into the sealing section 31 to seal the flow channel. When water flows out, it will not prevent automatic drainage.

[0043] The float assembly 4 is located on the side of the sealed section 31 near the measuring tube 1. The float assembly 4 is positioned between the measuring tube 1 and the connecting tube 3, or it can be located within the flow channel. The float assembly 4 has open and closed states. When water flows from the measuring tube 1 to the connecting tube 3, the float assembly 4 is in the open state to allow the flow channel to open. When there is no water in the measuring tube 1, the float assembly 4 is in the closed state to disconnect the flow channel. The float assembly 4 forms an automatically opening and closing valve within the flow channel. When there is water, the float assembly 4 automatically opens under the action of buoyancy. When there is no water, the float assembly 4 automatically seals the flow channel without the action of buoyancy, isolating it from the outside atmosphere. This ensures that the gas pressure within the upward borehole 6 remains relatively independent, facilitating accurate measurement of the gas pressure within the borehole.

[0044] The automatic drainage device for upward drilling in this embodiment of the invention automatically discharges accumulated water, ensuring the accuracy of measurement results and avoiding inaccurate gas pressure measurement due to water accumulation, as well as inaccurate pressure correction due to inaccurate water discharge measurement.

[0045] The following describes another specific embodiment of the present invention in detail with reference to the accompanying drawings.

[0046] like Figure 1 and Figure 2 As shown, the automatic drainage device for upward drilling in this embodiment of the invention includes a measuring pipe 1, a sealing assembly 2, a connecting pipe 3, and a float assembly 4.

[0047] The opening of the upward borehole 6 faces downward, and the borehole extends from bottom to top or extends obliquely upward in the vertical direction. When there is water in the borehole, the water can flow out from the opening of the borehole along the wall of the upward borehole 6.

[0048] Measuring tube 1 is arranged in the upward borehole 6, and sealing assembly 2 is disposed between the upward borehole 6 and measuring tube 1 to seal the gap between the inner wall of the upward borehole 6 and the outer wall of measuring tube 1. It should be understood that most of the section of measuring tube 1 extends into the upward borehole 6. In order to ensure the seal between the outer wall of measuring tube 1 and the borehole wall of the upward borehole 6, sealing assembly 2 can be set between measuring tube 1 and upward borehole 6 to achieve sealing and ensure that water and gas in the upward borehole 6 are connected to the inner cavity of measuring tube 1.

[0049] The sealing assembly 2 includes a first bladder 21, a second bladder 22, and a grouting pipe 23. The first bladder 21 and the second bladder 22 are arranged at intervals on the outer wall of the measuring tube 1. The grouting pipe 23 is connected to the first bladder 21, the second bladder 22, and the sealing space between the first bladder 21 and the second bladder 22. After the first bladder 21 and the second bladder 22 are tied and fixed to the measuring tube 1, the measuring tube 1 is placed in the upward borehole 6, and grout is injected into the first bladder 21, the second bladder 22, and the sealing space between the first bladder 21 and the second bladder 22. After the grout has solidified for 24 hours, the connecting pipe 3 and the float assembly 4 are installed.

[0050] A sieve tube 11 is connected to one end of the deep borehole of the measuring tube 1. The sieve tube 11 is used to filter the fluid flowing into the measuring tube 1. For example, the sieve tube 11 includes a tube body and multiple sieve holes opened on the outer wall of the tube body to prevent stones from entering the measuring tube 1, but allows water to flow into the measuring tube 1.

[0051] The measuring tube 1 can be made of stainless steel or cast iron and other metal materials, and has a certain strength. The upper and lower ends of the measuring tube 1 are provided with threaded sections, which are used to connect to the screen tube 11 and the connecting tube 3 respectively.

[0052] One end of the connecting pipe 3 is connected to the lower end of the measuring pipe 1, forming a flow channel between the measuring pipe 1 and the connecting pipe 3. The other end of the connecting pipe 3 is open upwards. The middle of the connecting pipe 3 has a U-shaped sealing section 31, which is used to fill fluid medium to seal the lower end of the connecting pipe 3. After the connecting pipe 3 and the measuring pipe 1 are connected, water in the borehole can flow out from the flow channel. However, because the connecting pipe 3 has a U-shaped sealing section 31, some water will remain in the sealing section 31 to seal the flow channel and prevent gas from escaping. When no water flows out of the borehole, water or other fluid medium can be actively filled into the sealing section 31 to seal the flow channel. When water flows out, it will not prevent automatic drainage.

[0053] Measuring pipe 1 and connecting pipe 3 can be directly connected together. However, when a direct connection is not possible, an intermediate pipe, such as a flexible rubber hose, can be placed between them. In this case, connecting pipe 3 can be suspended from a circumferential structure (coal seam roof). However, it is still necessary to ensure that a section of connecting pipe 3 is U-shaped to form a sealed section 31 with the opening facing upwards. This allows the flow channel to be sealed within the sealed section 31 by filling it with fluid media such as water or emulsion. Preferably, when there is no water, a mining emulsion is added to the sealed section 31. This liquid is not easily evaporated and is non-toxic to humans, ensuring good performance over a long period.

[0054] The end of the connecting tube 3 near the measuring tube 1 has a first connecting port 32 and a second connecting port 33. The first connecting port 32 is connected to the measuring tube 1, and the second connecting port 33 is connected to the pressure gauge 5. The pressure gauge 5 is used to obtain the pressure inside the measuring tube 1 after the accumulated water is discharged.

[0055] The float assembly 4 is located on the side of the sealed section 31 closest to the measuring tube 1. The float assembly 4 is disposed between the measuring tube 1 and the connecting tube 3, or within the flow channel. Specifically, the float assembly 4 includes a cylinder 41 and a float 42. The cylinder 41 has an inner cavity and is connected between the measuring tube 1 and the connecting tube 3, or the outer wall of the cylinder 41 is sealed to the inner wall of the flow channel. Preferably, the float assembly 4 is located within the connecting tube 3. A pressure gauge 5 is located on the side of the float assembly 4 furthest from the sealed section 31 and is connected to the flow channel to detect the pressure within the flow channel. The float 42 is a lightweight rubber ball with a density less than that of water.

[0056] In this embodiment, the inner cavity is connected to the flow channel, and the cross-sectional dimensions of the inner cavity gradually decrease from the middle to both ends. A float 42 is disposed within the inner cavity and can move up and down within it. The outer diameter of the float 42 is larger than the opening dimensions at both ends of the inner cavity. The upper port 43 of the inner cavity is larger than the lower port 44 of the inner cavity.

[0057] To improve sealing performance, annular grooves are provided on the walls of the cylinder 41 at both ends of the inner cavity, and sealing rings are provided in the annular grooves. In order to prevent the float 42 from contacting the water in the sealing section 31 due to excessive water level, in this embodiment, the vertical height H1 of the port of the connecting pipe 3 away from the measuring pipe 1 is lower than the height H2 of the lower port 44 of the float assembly 4. Therefore, when no water flows out of the upward drill hole 6, the water level in the sealing section 31 is lower than the lower port 44 of the inner cavity.

[0058] The float assembly 4 has an open state and a closed state. When water flows from the measuring tube 1 to the connecting pipe 3, the float 42 separates from the lower port 44 of the cylinder 41 under the action of the water, and the float assembly 4 is in the open state to open the flow channel. When there is no water in the measuring tube 1, the float 42 falls back to the lower port 44 of the cylinder 41 and seals with the cylinder 41, and the float assembly 4 is in the closed state to close the flow channel. The float assembly 4 forms an automatically opening and closing valve within the flow channel.

[0059] In this embodiment, when there is water in the borehole, the water enters the measuring tube through the screen tube, and then enters the connecting pipe. As the water accumulates, the lightweight rubber ball floats due to buoyancy, and the accumulated water enters the U-shaped sealing section and is discharged through the drain port of the connecting pipe. Because the liquid level in the U-shaped sealing section is lower than the liquid level at the lower port of the cylinder, and the gas pressure in the borehole is greater than atmospheric pressure, the liquid in the borehole can be smoothly discharged through the connecting pipe. Meanwhile, liquid always forms a liquid seal within the sealing section, ensuring the overall device's airtightness against gas.

[0060] When there is no water in the borehole, coal seam gas enters the measuring tube through the screen tube and then enters the connecting tube. Under the action of air pressure, the lightweight rubber ball is pressed against the lower port of the cylinder. The greater the pressure, the tighter the contact between the lightweight rubber ball and the lower port. The lower port is equipped with an O-ring rubber seal, which together with the rubber ball forms a good sealing device, forming the first gas sealing barrier. Even if there is a small amount of leakage, it can be sealed by the liquid seal ring formed by the emulsion poured into the U-shaped sealing section in advance, ensuring the gas tightness of the entire device.

[0061] like Figure 3 As shown, the method for measuring coal seam gas pressure according to an embodiment of the present invention includes the following steps:

[0062] S101. Drilling upward boreholes in the coal seam for measuring coal seam gas pressure. Depending on actual needs, there may be one or more upward boreholes; for example, multiple upward boreholes may be arranged in an array in the coal seam.

[0063] S102. An automatic drainage device for the upward drilling hole as described in any of the above embodiments is arranged in the upward drilling hole. When there are multiple upward drilling holes, a set of automatic drainage devices for the upward drilling hole is arranged in each upward drilling hole to measure the gas pressure in each upward drilling hole.

[0064] S103. Fill the sealed section of the automatic drainage device for the upward drilling with a fluid medium to isolate the inner cavity of the upward drilling hole from the outside atmosphere. That is, it is necessary to fill the sealed section of the connecting pipe with a fluid medium such as mining emulsion to achieve the sealing of the connecting pipe. At the same time, a seal is also formed between the float in the float assembly and the cylinder to ensure that the pressure in the upward drilling hole is not affected by the external air pressure. Even if some gas leaks from the seal between the float and the cylinder, it will be blocked by the fluid medium filled in the sealed section and will not leak out.

[0065] S104. The gas pressure parameters in the upward borehole are obtained in real time using the pressure gauge in the automatic drainage device of the upward borehole.

[0066] S105. When water flows out of the upward borehole, the water in the upward borehole can be automatically discharged through the upward borehole automatic drainage device.

[0067] In this embodiment, an emulsion is first poured into the U-shaped sealing section. Because the emulsion has a low evaporation rate, it can act as a liquid seal if there is no water in the borehole. If there is water in the upward borehole, the excess water can be drained by the automatic drainage device in this embodiment. Pressure measurement is performed in real time throughout the entire process. This embodiment can automatically drain the water in the upward borehole in a timely manner, ensuring that the data measured by the pressure gauge in the automatic drainage device is accurate and not affected by the water accumulation in the upward borehole.

[0068] This embodiment designs a drainage device and method for measuring gas pressure in upward coal seams. Compared with related technologies, this embodiment solves the problem that water accumulation in the upward borehole leads to inaccurate gas pressure measurements due to the inability to accurately measure the water volume during pressure measurement after gauge removal. This embodiment features a simple structure, compact size, requires no complex construction processes, is easy to install and disassemble, and is more widely applicable.

[0069] In the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of this invention.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An uphole automatic drainage device for a borehole, characterized by The application relates to an automatic water drainage device for an uphole, which comprises the following parts: a measuring pipe arranged in the uphole; a sealing assembly arranged between the uphole and the measuring pipe to seal the gap between the inner wall of the uphole and the outer wall of the measuring pipe; a connecting pipe connected with the lower end of the measuring pipe, a flow channel being formed between the measuring pipe and the connecting pipe, the other end of the connecting pipe being open upward, the middle part of the connecting pipe being provided with a U-shaped sealing section for filling fluid medium to seal the lower end of the connecting pipe; a floating ball assembly arranged on the side of the sealing section close to the measuring pipe, the floating ball assembly being arranged between the measuring pipe and the connecting pipe or in the flow channel, the floating ball assembly having an open state and a closed state, the floating ball assembly being in the open state when water in the measuring pipe flows to the connecting pipe to make the flow channel conductive, and the floating ball assembly being in the closed state when there is no water in the measuring pipe to make the flow channel disconnected; the floating ball assembly comprises a cylinder body having an inner cavity, the cylinder body being connected between the measuring pipe and the connecting pipe or the outer wall of the cylinder body being sealed with the inner wall of the flow channel, the inner cavity being communicated with the flow channel, the cross-sectional dimension of the inner cavity gradually decreasing from the middle part to the two ends; a floating ball arranged in the inner cavity, the floating ball being movable up and down in the inner cavity, the outer diameter of the floating ball being larger than the opening dimension of the two ends of the inner cavity; and a pressure gauge arranged on the side of the floating ball assembly away from the sealing section, the pressure gauge being communicated with the flow channel to detect the pressure in the flow channel; the height of the port of the connecting pipe away from the measuring pipe in the vertical direction is lower than the height of the lower port of the floating ball assembly. An annular groove is arranged on the wall surface of the cylinder body at the two ends of the inner cavity, and a sealing ring is arranged in the annular groove. The upper port of the inner cavity is larger than the lower port of the inner cavity. An intermediate pipe is arranged between the measuring pipe and the connecting pipe, and the connecting pipe is hung on the circumferential structure. The sealing section is filled with water or emulsion. The end of the connecting pipe close to the measuring pipe is provided with a first connecting port and a second connecting port, the first connecting port is connected with the measuring pipe, the second connecting port is connected with the pressure gauge, and the floating ball assembly is arranged in the connecting pipe. A screen pipe is connected to the end of the measuring pipe away from the connecting pipe, and the screen pipe is used for filtering the fluid flowing into the measuring pipe. The application further relates to a method for measuring the gas pressure in a coal seam, which comprises the following steps: drilling an uphole for measuring the gas pressure in the coal seam; arranging the automatic water drainage device for the uphole in the uphole; filling fluid medium in the sealing section of the automatic water drainage device for the uphole to separate the inner cavity of the uphole from the atmosphere; and obtaining the gas pressure parameters in the uphole in real time by using the pressure gauge in the automatic water drainage device for the uphole. ​ ​ 2. The uphole automatic water drainage device according to claim 1, wherein, ​ 3. The uphole automatic water drainage device according to claim 1, wherein, ​ 4. The uphole automatic water drainage device according to claim 1, wherein, ​ ​ 5. The uphole automatic water drainage device according to claim 1, wherein, ​ 6. The uphole automatic water drainage device of claim 1, wherein, ​ 7. A coal seam gas pressure measurement method characterized by, ​ ​ ​ ​ ​ When water flows out of the uplink borehole, the water in the uplink borehole can be automatically drained through the uplink borehole automatic drainage device.

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