Coalbed methane sampling device and method for coalbed methane exploration

Abstract

The present application provides a coalbed methane sampling device and method for coalbed methane exploration, which belongs to the field of coalbed methane extraction technology, including: a power cabin extracts coalbed methane on the inner wall of a borehole through a sampling head, the power cabin provides power for the sampling cabin extraction, and the coalbed methane extracted by the sampling head is collected and stored by the sampling cabin; by locating the sampling head and the expansion and contraction rod on both sides of the sampling device respectively, the sampling head and the expansion and contraction rod are used to fit and press against the inner wall of the borehole to fix the position of the extraction cabin in the borehole, thereby ensuring the accuracy of the sampling position and the stability of the sampling; by extending the expansion and contraction rod and pressing against the inner wall of the borehole when the extraction cabin reaches a preset sampling position in the borehole, the expansion and contraction rod is cooperated with the sampling head to fix the sampling position of the extraction cabin, thereby improving the reliability of sampling at various points in the borehole, which is conducive to ensuring the accuracy of the coalbed methane exploration results, and the sampling operation is simple and convenient, while improving the sampling efficiency and quality.

Description

Technical Field

[0001] The present application belongs to the field of coalbed methane mining technology, and specifically relates to a coalbed methane sampling device and method for coalbed methane exploration. Background Art

[0002] Coalbed methane, commonly known as "gas," is an unconventional natural gas mineral resource that coexists with coal. Its primary components are methane and hydrocarbon gases, primarily adsorbed on the surface of coal particles, with some remaining free in coal pores or dissolved in coalbed water. When its concentration in air reaches 5% to 16%, it can explode when exposed to open flames, posing a major threat to coal mine safety. However, coalbed methane is also an excellent fuel for industrial, chemical, power generation, and residential use. Its calorific value is two to five times that of conventional coal, and its combustion produces virtually no harmful emissions, making it a truly high-quality, clean energy source. In recent years, with the continuous advancement of coalbed methane extraction technology, it has become a highly valuable mineral energy source.

[0003] Currently, coalbed methane (CBM) extraction is primarily divided into two methods: underground extraction and surface drilling. Underground extraction involves extracting coal first and then gas, or extracting gas simultaneously. As a result, the vast majority of the extracted CBM is still released into the atmosphere, preventing it from being effectively utilized. Surface drilling, on the other hand, involves extracting gas first and then coal, creating an excellent foundation for the effective utilization of CBM and also improving coal mine safety. Therefore, surface drilling is the more advanced method of CBM extraction. CBM extraction relies primarily on CBM exploration, and CBM sampling is a crucial component of this exploration process. Unlike underground extraction, where personnel can descend into the well using needle-type samplers and air bags, surface CBM extraction personnel cannot descend into the well and must instead use sampling devices. However, existing CBM sampling devices are generally simple in function and structure, making sampling unreliable. This results in low sampling efficiency and poor quality, impacting the accuracy of CBM exploration results. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention provides a coalbed methane sampling device for coalbed methane exploration.

[0006] A second aspect of the present invention provides a coalbed methane sampling method for coalbed methane exploration.

[0007] In view of this, according to a first aspect of an embodiment of the present application, a coalbed methane sampling device for coalbed methane exploration is proposed, comprising:

[0008] The extraction chamber includes a sampling head, the sampling head is arranged on a first side of the shell of the extraction chamber, and the sampling head is in contact with the inner wall of the well to extract and sample coalbed methane on the inner wall of the well through the sampling head;

[0009] The power cabin is connected to the extraction cabin and provides power for the extraction of the sampling head;

[0010] Sampling cabin, which is connected to the sampling head and collects the coalbed methane extracted by the sampling head;

[0011] The expansion rod is arranged perpendicular to the extraction chamber, and is arranged on the second side of the shell of the extraction chamber. The telescopic end of the expansion rod is in contact with the inner wall of the well, and the expansion rod cooperates with the sampling head to fix the position of the extraction chamber in the well.

[0012] In a feasible embodiment, the extraction chamber, the power chamber and the sampling chamber are arranged in sequence from bottom to top, and the expansion and contraction rod is also arranged on the outside of the shell of the power chamber;

[0013] A pressure sensor is provided on the base of the expansion and contraction rod, and the pressure sensor monitors the pressure on the expansion and contraction rod;

[0014] The pressure sensor is arranged between the shell and the base of the extraction cabin, or the pressure sensor is arranged between the shell and the base of the power cabin.

[0015] In a feasible embodiment, the coalbed methane sampling device for coalbed methane exploration further includes:

[0016] The extraction pipeline is arranged in the extraction cabin, and the input end of the extraction pipeline is connected with the sampling head;

[0017] The extraction pump is arranged in the power cabin, the input end of the extraction pump is connected with the output end of the extraction pipeline, the output end of the extraction pump is connected with the sampling cabin, and the extraction pump provides negative pressure suction force for the sampling head.

[0018] In a feasible embodiment, the coalbed methane sampling device for coalbed methane exploration further includes:

[0019] The sampling main path is arranged in the sampling cabin, and the input end of the sampling main path is connected to the output end of the extraction pump, so that the sampling main path is connected to the extraction pipeline;

[0020] The sampling branch is arranged in the sampling cabin, and the input end of the sampling branch is connected to the sampling main line;

[0021] Sampling bottles are arranged along the height direction of the sampling cabin, and are detachably arranged on the sampling branch. The sampling bottles are connected to the sampling branch, and the sampling bottles correspond to the sampling branch one by one.

[0022] A sampling door, the sampling door covers the outside of the sampling bottle, the first end of the sampling door is rotatably connected to the shell of the sampling chamber, and the second end of the sampling door is connected to the shell of the sampling chamber through a lock;

[0023] The rotation axis of the sampling door is perpendicular to the axis of the sampling cabin.

[0024] In a feasible embodiment, the output end of the main sampling path passes through the shell of the sampling cabin, and the main sampling path forms an overflow port on the shell of the sampling cabin;

[0025] The output end of the sampling branch passes through the shell of the sampling cabin, and the sampling branch forms an exhaust port on the shell of the sampling cabin;

[0026] The coalbed methane sampling device for coalbed methane exploration also includes:

[0027] Overflow valve: The overflow valve is set at the output end of the sampling main line to discharge muddy water impurities carried in the coalbed methane;

[0028] Manual valves are provided at both ends of the sampling bottle to seal the sampling bottle;

[0029] The filling valve is arranged on the sampling branch and is located at the input end of the sampling bottle. The filling valve corresponds to the sampling branch one by one.

[0030] Exhaust valve: the exhaust valve is arranged on the sampling branch, the exhaust valve is located at the output end of the sampling bottle, and the exhaust valve corresponds to the sampling branch one by one.

[0031] In a feasible embodiment, the extraction pipeline includes an extraction main line and an extraction branch line, the extraction branch line is arranged on the extraction main line, the output end of the extraction branch line is connected to the input end of the extraction main line, and the extraction branch line is provided with an extraction valve;

[0032] The sampling head includes:

[0033] Sampling port: the sampling port is opened on the sampling head and is connected to the extraction branch;

[0034] Two telescopic rods, the telescopic rods are arranged perpendicular to the axis of the extraction chamber, the fixed ends of the telescopic rods are connected to the shell of the extraction chamber, and the telescopic ends of the telescopic rods extend in a direction away from the extraction chamber;

[0035] A top pressure plate is arranged parallel to the axis of the extraction chamber and is connected to the telescopic ends of the two telescopic rods;

[0036] A high-pressure hose, wherein the first end of the high-pressure hose is connected to the sampling port, the second end of the high-pressure hose is connected to the extraction branch, and the high-pressure hose corresponds to the extraction branch one by one.

[0037] In a feasible embodiment, a drainage port is opened on the inner wall of the well, a one-way valve is provided on the drainage port, and a sampling head is plugged into the drainage port;

[0038] The coalbed methane sampling device for coalbed methane exploration also includes:

[0039] A filter screen plate is arranged in the sampling port;

[0040] A top pressure head is provided on the filter screen plate, extends in a direction away from the telescopic rod, and is plugged into the one-way valve to open the one-way valve through the top pressure head;

[0041] The ultrasonic probe is arranged on the shell of the extraction chamber and is close to the sampling head.

[0042] In a feasible embodiment, the extraction pipeline further includes a pre-extraction branch, which is arranged on the extraction main line, wherein the output end of the pre-extraction branch is connected to the input end of the extraction main line, and a pre-extraction valve is arranged on the pre-extraction branch;

[0043] The coalbed methane sampling device for coalbed methane exploration also includes:

[0044] A pre-drainage pump is provided on a pre-drainage branch line;

[0045] Remote pressure gauge, which is installed on the pre-drainage branch line, monitors the pressure in the pre-drainage branch line;

[0046] Among them, a main extraction valve is also provided on the extraction pipeline, the input end of the main extraction valve is connected to the output end of the pre-extraction valve, and the input end of the main extraction valve is connected to the output end of the extraction valve.

[0047] In a feasible embodiment, the coalbed methane sampling device for coalbed methane exploration further includes:

[0048] A micro hydraulic station is provided with a hydraulic control valve group and is arranged in the power cabin. The micro hydraulic station provides power for the extraction cabin.

[0049] The sampling controller is arranged in the power cabin, the sampling controller is electrically connected to the micro hydraulic station, and the sampling controller controls the power cabin and the expansion and contraction rod.

[0050] According to a second aspect of an embodiment of the present application, a coalbed methane sampling method for coalbed methane exploration is provided, which is applied to a coalbed methane sampling device for coalbed methane exploration according to any of the above technical solutions, comprising:

[0051] Assemble the sampling cabin, connect the sampling device to the lower end of the drill pipe, and send the sampling device into the well through the drill pipe;

[0052] When the sampling device is lowered to the preset position in the well, the specific position of the extraction port on the inner wall of the well where the coalbed methane sampling is required is detected, and the sampling head is connected to the corresponding extraction port;

[0053] Make the expansion rod and sampling head press against the inner wall of the well;

[0054] Make the inside of the extraction chamber into a negative pressure state, and pre-extract the coalbed methane through the sampling head;

[0055] Continuously extract coalbed methane and transport it to the sampling cabin for collection;

[0056] The expansion rod and the sampling head are separated from the inner wall of the well, and the sampling device is pulled back to the top of the well through the drill pipe.

[0057] The coalbed methane sampling device and method for coalbed methane exploration of the present application have the following beneficial effects compared with the prior art:

[0058] The coalbed methane sampling device for coalbed methane exploration provided in the embodiment of the present application includes an extraction cabin, a power cabin, a sampling cabin and an expansion and contraction rod. The power cabin extracts coalbed methane on the inner wall of the borehole through the sampling head. The power cabin provides power for the sampling cabin extraction, and the coalbed methane extracted by the sampling head is collected and stored by the sampling cabin; by locating the sampling head and the expansion and contraction rod on both sides of the sampling device respectively, the sampling head and the expansion and contraction rod are used to fit and press against the inner wall of the borehole to fix the position of the extraction cabin in the borehole, thereby ensuring the accuracy of the sampling position and the stability of the sampling; by extending the expansion and contraction rod and pressing against the inner wall of the borehole when the extraction cabin reaches the preset sampling position in the borehole, the sampling position of the extraction cabin is fixed through the expansion and contraction rod and the sampling head, thereby improving the reliability of sampling at various points in the borehole, which is conducive to ensuring the accuracy of the coalbed methane exploration results, and the sampling operation is simple and convenient, while improving the sampling efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0060] Figure 1 A schematic structural diagram of a coalbed methane sampling device for coalbed methane exploration according to an embodiment of the present application;

[0061] Figure 2 A schematic structural diagram of a coalbed methane sampling device for coalbed methane exploration in cooperation with a drilling well according to an embodiment of the present application;

[0062] Figure 3 for Figure 2Schematic diagram of part A;

[0063] Figure 4 for Figure 2 Schematic diagram of part B;

[0064] Figure 5 for Figure 2 Enlarged view of point C;

[0065] Figure 6 A schematic flowchart of the steps of a coalbed methane sampling method for coalbed methane exploration provided in an embodiment of the present application;

[0066] in, Figures 1 to 5 The corresponding relationship between the reference numerals and component names is as follows:

[0067] 11. Extraction chamber; 12. Power chamber; 13. Sampling chamber; 14. Sampling head; 15. Expansion rod; 16. Pressure sensor; 17. Extraction pipeline; 18. Extraction pump; 19. Main sampling line; 20. Branch sampling line; 21. Sampling bottle; 22. Sampling door; 23. Overflow port; 24. Overflow valve; 25. Manual valve; 26. Filling valve; 27. Exhaust port; 28. Exhaust valve; 29. ​​Extraction port; 30. Check valve; 31. Filter plate; 32. Top pressure head; 33. Ultrasonic probe; 34. Pre-extraction pump; 35. Remote pressure gauge; 36. Micro hydraulic station; 37. Sampling controller; 38. Drilling; 39. Derrick; 40. Drilling rig; 41. Drill pipe; 42. Extraction main valve; 43. Pre-extraction valve.

[0068] 141. Sampling port; 142. Telescopic rod; 143. Top pressure plate; 144. High-pressure hose;

[0069] 171. Main extraction route; 172. Branch extraction route; 173. Pre-extraction branch route. DETAILED DESCRIPTION

[0070] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0071] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0072] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0073] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0074] like Figure 1 and Figure 2 As shown, according to the first aspect of the embodiment of the present application, a coalbed methane sampling device for coalbed methane exploration is proposed, comprising: an extraction chamber 11, a power chamber 12, a sampling chamber 13 and an expansion rod 15; the extraction chamber 11 includes a sampling head 14, which is arranged on the first side of the shell of the extraction chamber 11, and the sampling head 14 is in contact with the inner wall of the well 38, so that the coalbed methane is extracted and sampled on the inner wall of the well 38 through the sampling head 14; the power chamber 12 is in contact with the inner wall of the well 38, and the sampling head 14 is in contact with the inner wall of the well 38. The extraction cabin 11 is connected, and the power cabin 12 provides power for the extraction of the sampling head 14; the sampling cabin 13 is connected to the sampling head 14, and the sampling cabin 13 collects the coalbed methane extracted by the sampling head 14; the expansion and contraction rod 15 is arranged perpendicular to the extraction cabin 11, and the expansion and contraction rod 15 is arranged on the second side of the shell of the extraction cabin 11, and the telescopic end of the expansion and contraction rod 15 is in contact with the inner wall of the well 38, and the expansion and contraction rod 15 cooperates with the sampling head 14 to fix the position of the extraction cabin 11 in the well 38.

[0075] The coalbed methane sampling device for coalbed methane exploration provided in the embodiment of the present application includes an extraction cabin 11, a power cabin 12, a sampling cabin 13 and an expansion and contraction rod 15. The power cabin 12 extracts coalbed methane from the inner wall of the well 38 through the sampling head 14. The power cabin 12 provides power for the sampling cabin 13 to extract coalbed methane. The coalbed methane extracted by the sampling head 14 is collected and stored by the sampling cabin 13. By placing the sampling head 14 and the expansion and contraction rod 15 on both sides of the sampling device respectively, the sampling head 14 and the expansion and contraction rod 15 are used to fit and press against the inner wall of the well 38 to extract coalbed methane. The position of the extraction chamber 11 in the borehole 38 is fixed, thereby ensuring the accuracy of the sampling position and the stability of the sampling; when the extraction chamber 11 reaches the preset sampling position in the borehole 38, the expansion rod 15 is extended and pressed against the inner wall of the borehole 38, so that the expansion rod 15 cooperates with the sampling head 14 to fix the sampling position of the extraction chamber 11, thereby improving the reliability of sampling at various points in the borehole 38, which is conducive to ensuring the accuracy of the coalbed methane exploration results, and the sampling operation is simple and convenient, while improving the sampling efficiency and quality.

[0076] Furthermore, the shell of the extraction cabin 11, the shell of the power cabin 12 and the shell of the sampling cabin 13 together constitute the outer shell of the sampling device.

[0077] Further, such as Figure 2 As shown, the sampling device is used to take samples in a well 38. A derrick 39 is erected above the well 38, and a drilling rig 40 is installed on the derrick 39. A drill rod 41 is connected to the output end of the drilling rig 40. The housing of the sampling device is detachably connected to the drill rod 41 so that the sampling device can be sent to a specified position in the well 38 through the drill rod 41.

[0078] As a preferred solution, the housing of the sampling device is threadedly connected to the drill rod 41, which provides a reliable connection and is easy to assemble and disassemble.

[0079] like Figures 1 to 3 As shown, in a feasible embodiment, the extraction chamber 11, the power chamber 12 and the sampling chamber 13 are arranged in sequence from bottom to top, and the expansion rod 15 is also arranged on the outside of the shell of the power chamber 12; a pressure sensor 16 is provided on the base of the expansion rod 15, and the pressure sensor 16 monitors the pressure exerted on the expansion rod 15; wherein, the pressure sensor 16 is arranged between the shell and the base of the extraction chamber 11, or the pressure sensor 16 is arranged between the shell and the base of the power chamber 12.

[0080] In this technical solution, the extraction cabin 11, the power cabin 12 and the sampling cabin 13 in the outer shell are connected in sequence, and the shell of the sampling cabin 13 is detachably connected to the drill pipe 41; at least two expansion rods 15 are provided on the sampling device, so that the sampling device makes multi-point contact with the inner wall of the well 38 to ensure the positioning effect of the sampling device; at least one expansion rod 15 is provided on the shell of the extraction cabin 11, and the remaining expansion rods 15 play an auxiliary supporting role to ensure the stability of the extraction position of the extraction cabin 11; by providing a pressure sensor 16 between the base of the expansion rod 15 and the outer shell of the sampling device, the top pressure of the expansion rod 15 on the inner wall of the well 38 can be monitored, and then it can be judged whether the sampling device is fixed and stable or whether the sampling device can be pulled back by the drill pipe 41, thereby improving the degree of automation of the sampling operation.

[0081] Furthermore, the shell of the sampling chamber 13 is provided with threads matching the drill rod 41 so that the sampling device can be threadedly connected to the lower end of the drill rod 41 .

[0082] like Figure 3 As shown, in a feasible embodiment, the coalbed methane sampling device for coalbed methane exploration also includes: an extraction pipeline 17 and an extraction pump 18; the extraction pipeline 17 is arranged in the extraction cabin 11, and the input end of the extraction pipeline 17 is connected to the sampling head 14; the extraction pump 18 is arranged in the power cabin 12, and the input end of the extraction pump 18 is connected to the output end of the extraction pipeline 17, and the output end of the extraction pump 18 is connected to the sampling cabin 13, and the extraction pump 18 provides negative pressure suction force for the sampling head 14.

[0083] In this technical solution, the sampling head 14 is used to align with the extraction point on the inner wall of the well 38. The input end of the extraction pipeline 17 is connected to the sampling head 14, and the output end of the extraction pipeline 17 is connected to the extraction pump 18. When the extraction pump 18 is turned on, the extraction pipeline 17 is in a negative pressure state, and the coalbed methane enters the extraction pipeline 17 through the sampling head 14. The extraction pump 18 provides extraction suction for the coalbed methane to complete the extraction of the coalbed methane.

[0084] like Figure 4As shown, in a feasible embodiment, the coalbed methane sampling device for coalbed methane exploration further includes: a sampling main path 19, a sampling branch path 20, a sampling bottle 21 and a sampling door 22; the sampling main path 19 is arranged in the sampling cabin 13, and the input end of the sampling main path 19 is connected to the output end of the extraction pump 18, so that the sampling main path 19 is connected to the extraction pipeline 17; the sampling branch path 20 is arranged in the sampling cabin 13, and the input end of the sampling branch path 20 is connected to the sampling main path 19; the sampling bottle 21 is connected to the sampling door 22. 1 is arranged along the height direction of the sampling cabin 13, and the sampling bottle 21 is detachably arranged on the sampling branch 20. The sampling bottle 21 is connected to the sampling branch 20, and the sampling bottle 21 corresponds to the sampling branch 20 one by one. The sampling door 22 covers the outside of the sampling bottle 21. The first end of the sampling door 22 is rotatably connected to the housing of the sampling cabin 13, and the second end of the sampling door 22 is connected to the housing of the sampling cabin 13 by a lock. The rotation axis of the sampling door 22 is perpendicular to the axis of the sampling cabin 13.

[0085] In this technical solution, the sampling main line 19 is connected to the output end of the extraction pump 18, and the sampling branch line 20 is connected to the output end of the sampling main line 19 to divert the coalbed methane. The sampling bottle 21 is connected to the output end of the sampling branch line 20. The coalbed methane in the extraction pipeline 17 passes through the sampling main line 19 and flows into each sampling branch line 20, and then enters the sampling bottle 21 through the sampling branch line 20, so that the extracted coalbed methane can be collected and stored by using the sampling bottle 21; the sampling bottle 21 is vertically and detachably arranged in the sampling cabin 13 to increase the volume of the sampling bottle 21, and the sampling door 22 is movably connected to the outer shell of the sampling cabin 13. The sampling door 22 is a side-opening door structure, so that the sampling bottle 21 is protected by the sampling door 22 to prevent coalbed methane leakage caused by damage to the sampling bottle 21.

[0086] like Figure 4 As shown, in a feasible embodiment, the output end of the sampling main path 19 passes through the shell of the sampling cabin 13, and the sampling main path 19 forms an overflow port 23 on the shell of the sampling cabin 13; the output end of the sampling branch path 20 passes through the shell of the sampling cabin 13, and the sampling branch path 20 forms an exhaust port 27 on the shell of the sampling cabin 13; the coalbed methane sampling device for coalbed methane exploration also includes: an overflow valve 24, a manual valve 25, a filling valve 26 and an exhaust valve 28; the overflow valve 24 is set At the output end of the sampling main line 19, muddy and water impurities carried in the coalbed methane are discharged; manual valves 25 are set at both ends of the sampling bottle 21 to close the sampling bottle 21; the filling valve 26 is set on the sampling branch line 20, and the filling valve 26 is located at the input end of the sampling bottle 21, and the filling valve 26 corresponds to the sampling branch line 20 one by one; the exhaust valve 28 is set on the sampling branch line 20, and the exhaust valve 28 is located at the output end of the sampling bottle 21, and the exhaust valve 28 corresponds to the sampling branch line 20 one by one.

[0087] In this technical solution, the input and output ends of the sampling bottle 21 are both provided with manual valves 25, which are closed by the manual valve 25 to seal the sampling bottle 21, thereby completely disconnecting the sampling bottle 21 from the sampling branch 20, thereby ensuring that the coalbed methane in the sampling bottle 21 does not leak after the sampling bottle 21 is removed; at the same time, the output end of the sampling bottle 21 is provided with an exhaust valve 28, when the filling valve 26, the manual valve 25 and the exhaust valve 28 are opened, the sampling bottle 21 can also be used as a part of the pipeline for discharging the coalbed methane, The adaptability and practicality of the sampling cabin 13 are improved; by setting a filling valve 26 at the input end of the sampling bottle 21 to control the connection between the sampling bottle 21 and the sampling branch 20, and by setting an exhaust valve 28 at the output end of the sampling bottle 21 to control the connection between the sampling bottle 21 and the exhaust port 27, before collecting the coalbed methane, the coalbed methane with a high impurity content is discharged first to ensure the quality of the collected coalbed methane, improve the purity of the sampled coalbed methane, improve the quality of coalbed methane sampling, and thus ensure the accuracy of coalbed methane exploration. By allowing the output end of the sampling main path 19 to pass through the shell of the sampling cabin 13, the coalbed methane initially extracted and containing a large amount of mud and water impurities can be discharged back into the borehole 38; by providing an overflow valve 24 at the output end of the sampling main path 19, after the coalbed methane containing a large amount of mud and water impurities is discharged for a period of time and the coalbed methane becomes relatively purer, the overflow valve 24 is closed to prevent high-quality coalbed methane from leaking from the overflow port 23, thereby ensuring the collection efficiency of the coalbed methane by the sampling bottle 21 and the quality of the coalbed methane sampling, thereby ensuring the effectiveness and accuracy of the coalbed methane exploration and analysis results.

[0088] like Figure 3 As shown, in a feasible embodiment, the extraction pipeline 17 includes a main extraction line 171 and a branch extraction line 172. The branch extraction line 172 is arranged on the main extraction line 171, and the output end of the branch extraction line 172 is connected to the input end of the main extraction line 171. The branch extraction line 172 is provided with an extraction valve. The sampling head 14 includes: a sampling port 141, two telescopic rods 142, a top pressure plate 143 and a high-pressure hose 144. The sampling port 141 is opened on the sampling head 14 and is connected to the branch extraction line 172. The telescopic rod 142 is arranged perpendicular to the axis of the extraction cabin 11, the fixed end of the telescopic rod 142 is connected to the shell of the extraction cabin 11, and the telescopic end of the telescopic rod 142 extends in the direction away from the extraction cabin 11; the top pressure plate 143 is arranged parallel to the axis of the extraction cabin 11, and the top pressure plate 143 is connected to the telescopic ends of the two telescopic rods 142; the first end of the high-pressure hose 144 is connected to the sampling port 141, and the second end of the high-pressure hose 144 is connected to the extraction branch 172, and the high-pressure hose 144 corresponds to the extraction branch 172 one by one.

[0089] In this technical solution, the sampling head 14 includes a top pressure plate 143 and two telescopic rods 142. The fixed ends of the two telescopic rods 142 are fixedly connected to the shell of the extraction chamber 11, and the telescopic ends of the two telescopic rods 142 are respectively connected to both sides of the top pressure plate 143 to adjust the distance between the top pressure plate 143 and the shell of the extraction chamber 11 through the telescopic rods 142. An extraction branch road 172 is provided on the extraction main road 171, and a sampling port 141 is opened in the middle of the top pressure plate 143. The sampling port 141 is connected to the extraction branch road 172 through a high-pressure hose 144, so that the sampling head 14 is connected to the extraction main road 171 through the extraction branch road 172. The coalbed methane enters the extraction main road 171 after passing through the sampling port 141, the high-pressure hose 144 and the extraction branch road 172 in turn, and then enters the sampling main road 19 from the extraction main road 171. The extraction valve on the extraction branch road 172 is used to control the connection status between the sampling head 14 and the extraction main road 171.

[0090] like Figure 3 and Figure 5 As shown, in a feasible embodiment, an extraction port 29 is opened on the inner wall of the drilling well 38, a one-way valve 30 is provided on the extraction port 29, and the sampling head 14 is plugged into the extraction port 29; the coalbed methane sampling device for coalbed methane exploration also includes: a filter plate 31, a top pressure head 32 and an ultrasonic probe 33; the filter plate 31 is arranged in the sampling port 141; the top pressure head 32 is arranged on the filter plate 31, and the top pressure head 32 extends in a direction away from the telescopic rod 142, and the top pressure head 32 is plugged into the one-way valve 30 to push open the one-way valve 30 through the top pressure head 32; the ultrasonic probe 33 is arranged on the shell of the extraction cabin 11, and the ultrasonic probe 33 is arranged close to the sampling head 14.

[0091] In this technical solution, the sampling port 141 is aligned with the extraction port 29 on the inner wall of the well 38 to extract and sample. A one-way valve 30 is provided on the extraction port 29 to prevent the extraction port 29 from discharging coalbed methane at any time. During sampling, the sampling port 141 of the sampling head 14 is correspondingly plugged into the extraction port 29 of the well 38. A filter screen 31 is provided in the sampling port 141, and a pressure head 32 capable of pushing open the one-way valve 30 is provided on the filter screen 31. The pressure head 32 is used to push open the one-way valve 30 to ensure that the coalbed methane can flow out of the extraction port 29, and then the coalbed methane is extracted through the sampling head 14. An ultrasonic probe 33 is installed on the shell of the extraction cabin 11, and the position of the ultrasonic probe 33 is made to correspond one-to-one with the sampling head 14, so that the specific position of the extraction port 29 can be detected by the ultrasonic probe 33, so that the sampling port 141 can be quickly and accurately docked with the extraction port 29, thereby reducing the difficulty of operation and improving the sampling efficiency.

[0092] Furthermore, the filter screen 31 is made of a stainless steel porous screen coaxially arranged with the sampling port 141. Specifically, the thickness of the filter screen 31 is 3 mm to 5 mm to ensure that the filter screen 31 provides a sufficiently strong support effect on the pressure head 32, thereby ensuring that the filter screen 31 can push the one-way valve 30 open.

[0093] like Figure 3 As shown, in a feasible embodiment, the extraction pipeline 17 also includes a pre-extraction branch 173, which is arranged on the extraction main road 171, and the output end of the pre-extraction branch 173 is connected to the input end of the extraction main road 171, and a pre-extraction valve 43 is provided on the pre-extraction branch 173; the coalbed methane sampling device for coalbed methane exploration also includes: a pre-extraction pump 34 and a remote pressure gauge 35; the pre-extraction pump 34 is arranged on the pre-extraction branch 173; the remote pressure gauge 35 is arranged on the pre-extraction branch 173, and the remote pressure gauge 35 monitors the pressure in the pre-extraction branch 173; wherein, a main extraction valve 42 is also provided on the extraction pipeline 17, the input end of the main extraction valve 42 is connected to the output end of the pre-extraction valve 43, and the input end of the main extraction valve 42 is connected to the output end of the extraction valve.

[0094] In this technical solution, the pre-extraction valve 43 is used to control the connectivity between the pre-extraction branch 173 and the extraction main road 171, and the extraction main valve 42 serves as the control main valve for the air intake of the extraction main road 171. The extraction main valve 42 controls the connectivity between the pre-extraction branch 173 and all extraction branches 172 and the extraction main road 171. By setting a pre-extraction pump 34 on the pre-extraction branch 173, pre-extraction is carried out before formal extraction, and the main extraction valve 42 is kept in a closed state to reduce the pressure in the pre-extraction branch 173 in advance, thereby increasing the initial suction force during extraction. By setting the pre-extraction pump 34 to provide a sufficiently strong pre-extraction force, it provides a guarantee for the subsequent continuous extraction of coalbed methane and improves the efficiency of continuous extraction of coalbed methane; by setting a pre-extraction valve 43 and a remote pressure gauge 35 on the pre-extraction branch 173, the pressure in the pre-extraction branch 173 can be controlled and monitored, and then it is judged according to the pressure in the pre-extraction branch 173 whether the conditions for starting continuous extraction of coalbed methane are met.

[0095] like Figure 3 and Figure 4 As shown, in a feasible embodiment, the coalbed methane sampling device for coalbed methane exploration also includes: a micro hydraulic station 36 and a sampling controller 37; a hydraulic control valve group is provided on the micro hydraulic station 36, the micro hydraulic station 36 is arranged in the power cabin 12, and the micro hydraulic station 36 provides power for the extraction cabin 11; the sampling controller 37 is arranged in the power cabin 12, the sampling controller 37 is electrically connected to the micro hydraulic station 36, and the sampling controller 37 controls the power cabin 12 and the expansion and contraction rod 15.

[0096] In this technical solution, the micro hydraulic station 36 provides power for the expansion and contraction rod 15, the telescopic rod 142, the pre-extraction pump 34 and the extraction pump 18, and the hydraulic pressure of the micro hydraulic station 36 is controlled by the hydraulic control valve group; the ultrasonic probe 33, the pressure sensor 16, the remote pressure gauge 35, the micro hydraulic station 36 and all valves except the manual valve 25 are electrically connected to the sampling controller 37 and controlled by the sampling controller 37.

[0097] Furthermore, the pre-extraction pump 34 is a hydraulic plunger pump, the extraction pump 18 is a hydraulic diaphragm pump, and the expansion rod 15 and the telescopic rod 142 are both hydraulic cylinders.

[0098] Furthermore, the hydraulic plunger pump and the hydraulic diaphragm pump are both hydraulically driven reciprocating suction pumps, and the hydraulic power of the hydraulic plunger pump, the hydraulic diaphragm pump, the hydraulic cylinder of the expansion rod 15 and the hydraulic cylinder of the telescopic rod 142 all comes from the micro hydraulic station 36.

[0099] like Figure 6 As shown, according to the second aspect of the present application, a coalbed methane sampling method for coalbed methane exploration is proposed, which is applied to a coalbed methane sampling device for coalbed methane exploration as in any one of the above technical solutions, comprising:

[0100] Step 100: Assemble the sampling chamber 13, connect the sampling device to the lower end of the drill pipe 41, and send the sampling device into the well 38 through the drill pipe 41;

[0101] Step 200: After the sampling device is lowered to a preset position in the well 38, the specific location of the extraction port 29 on the inner wall of the well 38 where coalbed methane sampling is required is detected, and the sampling head 14 is connected to the corresponding extraction port 29;

[0102] Step 300: Press the expansion rod 15 and the sampling head 14 against the inner wall of the well 38;

[0103] Step 400: The interior of the extraction chamber 11 is brought into a negative pressure state, and the coalbed methane is pre-extracted through the sampling head 14;

[0104] Step 500: Continuously extracting coalbed methane and transporting the coalbed methane to the sampling cabin 13 for collection;

[0105] Step 600 : Separate the expansion and contraction rod 15 and the sampling head 14 from the inner wall of the well 38 , and pull the sampling device back to the top of the well 38 via the drill pipe 41 .

[0106] In the coalbed methane sampling method for coalbed methane exploration provided in the embodiment of the present application, the power cabin 12 provides power for the sampling cabin 13 to extract, and the coalbed methane extracted by the sampling head 14 is collected and stored by the sampling cabin 13; by pre-extracting the coalbed methane before extracting the coalbed methane, the suction force of the subsequent extraction is increased, thereby improving the extraction efficiency of the coalbed methane; the sampling head 14 and the expansion and contraction rod 15 are respectively located on both sides of the sampling device, and the sampling head 14 is first made to reach the vicinity of the corresponding extraction port 29 and dock with the extraction port 29. When the extraction cabin 11 reaches the preset sampling position in the borehole 38, the expansion and contraction rod 15 is extended and pressed against the inner wall of the borehole 38, so that the sampling position of the extraction cabin 11 is fixed by the expansion and contraction rod 15 and the sampling head 14, thereby improving the reliability of sampling at various points in the borehole 38, which is conducive to ensuring the accuracy of the coalbed methane exploration results, and the sampling operation is simple and convenient, while improving the sampling efficiency and quality.

[0107] Example:

[0108] First, open the sampling door 22, install the sampling bottle 21 on the corresponding sampling branch 20 in the sampling chamber 13, manually open the manual valves 25 at the upper and lower ends of the sampling bottle 21, then close the sampling door 22, connect the entire sampling device to the lower end of the drill pipe 41, and then use the drill pipe 41 to send the sampling device into the well 38;

[0109] After the sampling device is lowered to a preset position in the well 38, the ultrasonic probe 33 is used to detect the specific position of the extraction port 29 on the inner wall of the well 38 where coalbed methane sampling is required. Based on the detection result of the ultrasonic probe 33, the position of the sampling head 14 is fine-tuned so that the sampling port 141 is docked with the corresponding extraction port 29;

[0110] The expansion rod 15 and the telescopic rod 142 are controlled to extend synchronously until the expansion rod 15 and the top pressure plate 143 are pressed against the inner wall of the well 38, thereby completing the positioning of the sampling device and the docking of the sampling port 141 with the extraction port 29. At the same time, the one-way valve 30 in the extraction port 29 is pushed open by the top pressure head 32 in the sampling port 141, thereby connecting the sampling device with the extraction port 29.

[0111] Start the pre-extraction pump 34, open the pre-extraction valve 43 and the extraction valve at the same time, and keep the extraction main valve 42 closed, so that the extraction pipeline 17 upstream of the extraction main valve 42 is in a negative pressure state, and initially extract a certain amount of coalbed methane;

[0112] Start the extraction pump 18, shut down the pre-extraction pump 34, and open the extraction main valve 42, so that the entire extraction pipeline 17 begins to continuously extract coalbed methane, which is then transported to the input end of the sampling bottle 21 through the sampling main line 19 and the sampling branch line 20. The initially extracted coalbed methane sample is mixed with a large amount of muddy water impurities. First, open the overflow valve 24 to allow the impurity-containing coalbed methane to be discharged back into the well 38 through the overflow port 23.

[0113] After a certain period of overflow drainage, the extracted coalbed methane sample has become relatively pure. At this time, the overflow valve 24 is closed, and the filling valve 26 above the sampling bottle 21 and the exhaust valve 28 below the sampling bottle 21 are opened at the same time, so that the coalbed methane sample fills the sampling bottle 21. Then, the filling valve 26, exhaust valve 28, extraction pump 18, extraction main valve 42 and extraction valve are closed;

[0114] Control the expansion and contraction rod 15 and the sampling head 14 to retract, pull the sampling device back to the top of the well 38 through the drill pipe 41, open the sampling door 22, manually close the manual valves 25 at the upper and lower ends of the sampling bottle 21, and remove the sampling bottle 21 from the sampling cabin 13, thus completing a coalbed methane sampling operation.

[0115] Coalbed methane exploration work generally requires sampling and analysis at multiple locations at different heights in the borehole 38. When sampling is required at another location in the borehole 38 again, the above steps are repeated to complete the coalbed methane sampling operation at the next location, and then the coalbed methane sampling operation is completed at different locations in the borehole 38.

[0116] The coalbed methane sampling method for coalbed methane exploration provided in the embodiment of the present application is applied to a coalbed methane sampling device for coalbed methane exploration including any of the above-mentioned technical solutions. Therefore, the coalbed methane sampling method for coalbed methane exploration has all the beneficial effects of the coalbed methane sampling device for coalbed methane exploration of the above-mentioned technical solutions, which will not be elaborated here.

[0117] It is easy for those skilled in the art to understand that the above embodiments can be freely combined and superimposed without conflict.

[0118] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A coalbed methane sampling device for coalbed methane exploration, characterized in that: The coalbed methane sampling device for coalbed methane exploration comprises: An extraction chamber, the extraction chamber comprising a sampling head, the sampling head being disposed on a first side of a shell of the extraction chamber, the sampling head being in contact with an inner wall of a wellbore, so as to extract and sample coalbed methane on the inner wall of the wellbore through the sampling head; A power cabin connected to the extraction cabin, the power cabin providing power for the extraction of the sampling head; A sampling cabin, the sampling cabin is connected to the sampling head, and the sampling cabin collects the coalbed methane extracted by the sampling head; an expansion rod, the expansion rod being arranged perpendicular to the extraction chamber, the expansion rod being arranged on the second side of the housing of the extraction chamber, the telescopic end of the expansion rod being in contact with the inner wall of the well, and the expansion rod cooperating with the sampling head to fix the position of the extraction chamber in the well; The extraction chamber, the power chamber and the sampling chamber are arranged in sequence from bottom to top, and the expansion and contraction rod is also arranged on the outside of the shell of the power chamber; A pressure sensor is provided on the base of the expansion and contraction rod, and the pressure sensor monitors the pressure applied to the expansion and contraction rod; Wherein, the pressure sensor is arranged between the shell of the extraction cabin and the base, or the pressure sensor is arranged between the shell of the power cabin and the base; The coalbed methane sampling device for coalbed methane exploration also includes: An extraction pipeline, the extraction pipeline is arranged in the extraction chamber, and the input end of the extraction pipeline is connected to the sampling head; An extraction pump is disposed in the power cabin, an input end of the extraction pump is connected to an output end of the extraction pipeline, an output end of the extraction pump is connected to the sampling cabin, and the extraction pump provides negative pressure suction force for the sampling head; A main sampling path, the main sampling path is arranged in the sampling cabin, the input end of the main sampling path is connected to the output end of the extraction pump, so that the main sampling path is connected to the extraction pipeline; A sampling branch, the sampling branch is arranged in the sampling chamber, and the input end of the sampling branch is connected to the sampling main path; Sampling bottles, arranged along the height direction of the sampling cabin, detachably arranged on the sampling branch, connected to the sampling branch, and corresponding one to one with each other; A sampling door, the sampling door covering the outside of the sampling bottle, the first end of the sampling door being rotatably connected to the housing of the sampling chamber, and the second end of the sampling door being connected to the housing of the sampling chamber via a lock; Wherein, the rotation axis of the sampling door is perpendicular to the axis of the sampling chamber; The extraction pipeline includes an extraction main line and an extraction branch line, wherein the extraction branch line is arranged on the extraction main line, the output end of the extraction branch line is connected to the input end of the extraction main line, and the extraction branch line is provided with an extraction valve; The sampling head comprises: A sampling port, the sampling port is provided on the sampling head and is connected to the extraction branch; Two telescopic rods, the telescopic rods being arranged perpendicular to the axis of the extraction chamber, the fixed ends of the telescopic rods being connected to the housing of the extraction chamber, and the telescopic ends of the telescopic rods extending away from the extraction chamber; A top pressure plate, the top pressure plate is arranged parallel to the axis of the extraction chamber, and the top pressure plate is connected to the telescopic ends of the two telescopic rods; A high-pressure hose, wherein the first end of the high-pressure hose is connected to the sampling port, the second end of the high-pressure hose is connected to the extraction branch, and the high-pressure hose corresponds to the extraction branch one by one.

2. A coalbed methane sampling device for coalbed methane exploration according to claim 1, characterized in that: The output end of the main sampling path passes through the shell of the sampling cabin, and the main sampling path forms an overflow port on the shell of the sampling cabin; The output end of the sampling branch passes through the shell of the sampling cabin, and the sampling branch forms an exhaust port on the shell of the sampling cabin; The coalbed methane sampling device for coalbed methane exploration also includes: An overflow valve is provided at the output end of the main sampling path to discharge muddy water impurities carried in the coalbed methane; Manual valves, the manual valves being provided at both ends of the sampling bottle to seal the sampling bottle; A perfusion valve, which is arranged on the sampling branch and located at the input end of the sampling bottle, and has a one-to-one correspondence with the sampling branch; An exhaust valve is provided on the sampling branch, the exhaust valve is located at the output end of the sampling bottle, and the exhaust valve corresponds to the sampling branch one by one.

3. A coalbed methane sampling device for coalbed methane exploration according to claim 1, characterized in that: An extraction port is provided on the inner wall of the well, a one-way valve is provided on the extraction port, and the sampling head is plugged into the extraction port; The coalbed methane sampling device for coalbed methane exploration also includes: A filter screen plate, the filter screen plate being arranged in the sampling port; A pressure head is provided on the filter screen, the pressure head extends in a direction away from the telescopic rod, and the pressure head is plugged into the one-way valve so as to push the one-way valve open. An ultrasonic probe is arranged on the shell of the extraction chamber and is close to the sampling head.

4. A coalbed methane sampling device for coalbed methane exploration according to claim 1, characterized in that: The extraction pipeline further includes a pre-extraction branch, which is arranged on the extraction main line, wherein the output end of the pre-extraction branch is connected to the input end of the extraction main line, and a pre-extraction valve is arranged on the pre-extraction branch; The coalbed methane sampling device for coalbed methane exploration also includes: a pre-drainage pump, the pre-drainage pump being arranged on the pre-drainage branch line; a remote pressure gauge, the remote pressure gauge being arranged on the pre-drainage branch line and monitoring the pressure in the pre-drainage branch line; Wherein, a main extraction valve is further provided on the extraction pipeline, the input end of the main extraction valve is connected to the output end of the pre-extraction valve, and the input end of the main extraction valve is connected to the output end of the extraction valve.

5. A coalbed methane sampling device for coalbed methane exploration according to any one of claims 1 to 4, characterized in that: The coalbed methane sampling device for coalbed methane exploration also includes: A micro hydraulic station, wherein the micro hydraulic station is provided with a hydraulic control valve group, the micro hydraulic station is arranged in the power cabin, and the micro hydraulic station provides power for the extraction cabin; A sampling controller is provided in the power cabin, the sampling controller is electrically connected to the micro hydraulic station, and the sampling controller controls the power cabin and the expansion and contraction rod.

6. A coalbed methane sampling method for coalbed methane exploration, characterized in that: The coalbed methane sampling device for coalbed methane exploration according to any one of claims 1 to 5 comprises: Assembling a sampling cabin, connecting a sampling device to the lower end of a drill pipe, and delivering the sampling device into the well through the drill pipe; After the sampling device is lowered to a preset position in the well, the specific position of the extraction port on the inner wall of the well where coalbed methane sampling is required is detected, and the sampling head is connected to the corresponding extraction port; Pressing the expansion rod and the sampling head against the inner wall of the well; The interior of the extraction chamber is in a negative pressure state, and the coalbed methane is pre-extracted through the sampling head; Continuously extracting coalbed methane and transporting the coalbed methane to the sampling cabin for collection; The expansion rod and the sampling head are separated from the inner wall of the well, and the sampling device is pulled back to the top of the well through the drill rod.

Images