Lifting rotary sampling device for coal-bed gas well

Abstract

The utility model discloses a coal-bed gas well lifting rotary type sampling device which comprises a vertically-arranged square column, a lifting ring connected with a lifting steel wire rope is fixedly arranged at the upper end of the square column, a front-back through installation long hole is formed in the square column in the height direction, and the length of the installation long hole is smaller than the diameter of a coal-bed gas well shaft. A drilling type sampler parallel to the square column is rotationally arranged in the long mounting hole, a sampling hydraulic motor used for driving the drilling type sampler to rotate in the front-back direction is arranged on the side portion of the square column, and the positions, above and below the long mounting hole, of the side portion of the square column are each provided with a guiding and positioning mechanism. The coal-bed gas well sampling device is scientific in principle, reasonable in structural design, timely in sampling and high in sealing performance, enables a coal sample to keep good original ecology, is simple, convenient and rapid in sampling process, and provides reliable data support for coal-bed gas well drilling through testing of the taken-out coal sample.

Description

Technical Field

[0001] The utility model belongs to the technical field of mine gas prevention and control and management, and in particular relates to a lifting and rotating sampling device for a coalbed methane well. Background Art

[0002] Coalbed methane drilling is a drilling project for the purpose of detecting self-generated and self-stored coalbed methane (also known as gas) in underground coal seams. Most coal seams in southern my country are characterized by "many layers and thin layers". When drilling coalbed methane wells, it is difficult to sample while drilling. Even after sampling, the accuracy of the test and analysis results is affected by poor sealing. At present, after the coalbed methane well is built, coal seams of different depths are generally sampled manually. Such operations have a lag and affect the early mining and production of coalbed methane wells. If a sealed sampling is performed after drilling to a certain depth of coal seam (before casing cementing), not only will the sampling quality be good, but also the test and analysis can be performed simultaneously in the laboratory. The test and analysis results will also help guide the next deeper drilling construction operations. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a coalbed methane well lifting and rotating sampling device with accurate and timely sampling, good sealing performance and more authentic and reliable test and analysis results.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a coalbed methane well lifting and rotating sampling device, including a vertically arranged square column, a lifting ring connected to the lifting wire rope is fixedly provided on the upper end of the square column, a long installation hole that is transparent from front to back is opened in the height direction of the square column, the length of the long installation hole is less than the diameter of the coalbed methane wellbore, a drilling sampler parallel to the square column is rotatably arranged in the long installation hole, a sampling hydraulic motor for driving the drilling sampler to rotate along the front and rear directions is provided on the side of the square column, and a group of guiding and positioning mechanisms are respectively provided on the side of the square column above and below the long installation hole.

[0005] The drilling sampler comprises an outer cylinder with an open lower end, wherein a drilling hydraulic cylinder, a drilling hydraulic motor and a sampling tube are arranged in sequence from top to bottom in the outer cylinder, the lower end of the telescopic rod of the drilling hydraulic cylinder is connected to the top of the drilling hydraulic motor, the power output shaft of the drilling hydraulic motor is coaxially connected to the upper end of the sampling tube, and a detachable material guide sealing assembly is arranged inside the lower end of the sampling tube; a rotating shaft rotatably connected to a square column is fixedly arranged on the left and right sides of the middle of the outer cylinder, and the sampling hydraulic motor is connected to the rotating shaft on the left or right side;

[0006] A plurality of annular retainers are evenly arranged at the middle and upper part of the outer circle of the sampling tube, and each annular retainer is provided with a plurality of balls which are rollingly connected with the inner wall of the outer cylinder;

[0007] A piston plate is slidably provided on the upper part of the inner circle of the sampling tube, a one-way air valve is provided at the center of the piston plate, a straight hole penetrating the inside of the sampling tube is opened at the center of the drilling hydraulic motor, an L-shaped hole is provided inside the piston rod of the drilling hydraulic cylinder, the lower port of the L-shaped hole is connected with the upper port of the straight hole, the upper port of the L-shaped hole faces backward and is connected to a pipe joint passing through the outer cylinder body, and a sealing cap is provided at the outer end of the pipe joint.

[0008] The detachable material guide sealing assembly comprises a material guide cylinder coaxially assembled inside the lower port of the sampling tube, the inner circle of the material guide cylinder is composed of an upper cylindrical section, a middle conical section and a lower cylindrical section from top to bottom, the diameter of the upper cylindrical section is larger than the diameter of the lower cylindrical section, the middle conical section is a conical surface with a thick upper part and a thin lower part, the diameter of the upper end of the middle conical section is equal to the diameter of the upper cylindrical section, and the diameter of the lower end of the middle conical section is equal to the diameter of the lower cylindrical section;

[0009] A disc is provided at the upper port of the upper cylindrical section, and a plurality of feeding holes are provided on the disc which are evenly arranged along the circumferential direction. A conical valve core is provided at the middle cone section, and the diameter of the upper end of the valve core is larger than the diameter of the lower port of the middle cone section and smaller than the diameter of the upper port of the middle cone section. A guide rod is vertically fixed at the center of the lower surface of the disc, and a guide hole with an upper opening is provided at the center of the valve core. The lower part of the guide rod extends into the guide hole, and a compression spring is sleeved on the guide rod. The upper and lower ends of the compression spring are respectively press-connected with the lower surface of the disc and the upper end surface of the valve core. Under the action of the compression spring, the conical surface of the valve core is sealed with the conical surface of the middle cone section; a flexible sheath which completely covers the compression spring is provided between the lower surface of the disc and the upper surface of the valve core.

[0010] The guide cylinder and the sampling tube are connected as a whole through a plurality of radially arranged countersunk screws on the outer circle of the sampling tube. The lower end of the guide cylinder is connected to the lower port of the sampling tube. A plurality of diamond bits are evenly arranged on the annular surfaces at the lower ends of the sampling tube and the guide cylinder.

[0011] The guiding and positioning mechanism includes four cross bars and four positioning hydraulic cylinders arranged at intervals. The four cross bars are arranged in a circular array along the vertical center line of the square column. The inner end of each cross bar is fixedly connected to a side surface of the square column. The outer end of each cross bar is rotatably provided with a guide wheel. A connecting plate is fixedly provided between two adjacent cross bars on the outer side of the square column. A bottom plate is provided at the inner end of the cylinder body of each positioning hydraulic cylinder. The bottom plate is fixedly connected to the connecting plate by bolts. A supporting reinforcing rod is provided between the outer ends of two adjacent cross bars.

[0012] Each supporting reinforcement rod comprises a first connecting rod, a second connecting rod, a supporting positioning ring, a third connecting rod and a fourth connecting rod which are coaxially connected in sequence, the first connecting rod and the second connecting rod bracket are detachably connected via a first flange bolt connection assembly, and the third connecting rod and the fourth connecting rod are detachably connected via a second flange bolt connection assembly;

[0013] The cylinder body of each positioning hydraulic cylinder coaxially passes through a supporting positioning ring, a sleeve is provided between the outer circle of the cylinder body of the positioning hydraulic cylinder and the inner circle of the supporting positioning ring, the outer end of the piston rod of each positioning hydraulic cylinder is detachably connected to an arc-shaped top plate through a third flange bolt connection assembly, and a number of nails are evenly arranged on the outer circle of the arc-shaped top plate.

[0014] By adopting the above technical solution, compared with the prior art, the utility model has the following technical effects:

[0015] 1) During the drilling construction of coalbed methane wells, each time a coal seam is drilled, the utility model is lowered along the wellbore to the coal seam at a specified depth for sealed sampling, so that the sampling is more accurate and timely, and the test and analysis results are more real and reliable.

[0016] 2) The drilling sampler is set in a square column with front and rear transparent installation long holes through a rotating shaft. When moving up and down along the coalbed methane wellbore, it is hidden in the installation long hole. When performing sampling operations, the drilling sampler rotates out of the square column and is perpendicular to the square column.

[0017] 3) The drilling hydraulic cylinder and drilling hydraulic motor provide power for rotary drilling during the sampling process. The balls on the annular retainer roll on the inner wall of the sampling tube, playing a guiding role during the drilling process. The guide barrel is fixed to the inner circle of the sampling tube port by screws, which is convenient for installation and disassembly. The guide barrel is arranged from top to bottom as an upper cylindrical section, a middle conical section and a lower cylindrical section. During the drilling sampling process, the extrusion force of the coal sample overcomes the elastic force of the compression spring, making it easier for the coal sample to enter the sampling tube. After the sampling is completed, the elastic force of the compression spring causes the valve core to quickly seal the guide barrel, thereby ensuring that the coal sample remains in the original ecology of the underground coal seam.

[0018] 4) The setting of the flexible sheath prevents the coal sample from contacting the compression spring and affecting the elasticity of the compression spring. At the same time, the flexible sheath can be flexibly deformed when the valve core slides up and down along the guide rod.

[0019] 5) The guide wheels at the outer ends of the four cross bars of the guide and positioning mechanism play a guiding role when moving up and down. When core sampling is performed, the four positioning hydraulic cylinders are extended to make the arc-shaped top plate press against the inner wall of the wellbore, fixing the entire sampling device firmly. The support reinforcement rod is used to connect two adjacent cross bars to increase their stability and strength. The first flange bolt connection assembly and the second flange bolt connection assembly used in the support reinforcement rod are easy to install and disassemble. The support positioning ring supports the positioning hydraulic cylinder in the cantilever state to maintain the radial state and enhance the stability when pressing against the inner wall of the wellbore. The setting of the third flange bolt connection assembly facilitates the disassembly and assembly of the arc-shaped top plate, and also facilitates the disassembly and assembly of the positioning hydraulic cylinder through the support positioning ring.

[0020] 6) The setting of the pipe joint, L-shaped hole, straight hole and one-way air valve on the piston plate facilitates the negative pressure vacuuming inside the sampling tube to avoid the air in the temporary storage space after sampling from affecting the coal sample. At the same time, when taking out the coal sample, a positive pressure air flow channel is provided to push the coal sample out of the sampling tube by driving the piston plate to move in the sampling tube.

[0021] To sum up, the utility model has scientific principles, reasonable structural design, timely sampling and strong sealing, so that the coal samples maintain good original ecology, the sampling process is simple, convenient and fast, and through the testing of the taken coal samples, reliable data support is provided for coalbed methane well drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the longitudinal structure in the utility model;

[0023] Figure 2 It is a schematic diagram of the top view of the guiding and positioning mechanism in the utility model;

[0024] Figure 3 yes Figure 1 Sectional view at A in the middle;

[0025] Figure 4 yes Figure 1 Cross-sectional view at point B. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] like Figure 1-Figure 4 As shown, the utility model of the coalbed methane well lifting and rotating sampling device comprises a vertically arranged square column 1, a lifting ring (not shown) connected to the lifting wire rope is fixedly provided on the upper end of the square column 1, a front-to-back transparent installation long hole 2 is opened in the square column 1 along the height direction, the length of the installation long hole 2 is less than the diameter of the coalbed methane wellbore, a drilling sampler 3 parallel to the square column 1 is arranged in the installation long hole 2, a sampling hydraulic motor 4 for driving the drilling sampler 3 to rotate along the front-to-back direction is arranged on the side of the square column 1, and a group of guiding and positioning mechanisms 5 are respectively arranged above and below the installation long hole 2 on the side of the square column 1.

[0028] The drilling sampler 3 comprises an outer cylinder 6 with an open lower end, in which a drilling hydraulic cylinder 7, a drilling hydraulic motor 8 and a sampling tube 9 are arranged in sequence from top to bottom. The lower end of the telescopic rod of the drilling hydraulic cylinder 7 is connected to the top of the drilling hydraulic motor 8, the power output shaft of the drilling hydraulic motor 8 is coaxially connected to the upper end of the sampling tube 9, and a detachable material guide sealing assembly is arranged inside the lower end of the sampling tube 9; a rotating shaft 10 rotatably connected to the square column 1 is fixedly arranged on the left and right sides of the middle part of the outer cylinder 6, and the sampling hydraulic motor 4 is connected to the rotating shaft 10 on the left or right side in a transmission manner;

[0029] A plurality of annular retainers 11 are evenly arranged at the middle and upper part of the outer circle of the sampling tube 9, and each annular retainer 11 is provided with a plurality of balls 12 that are rollingly connected to the inner wall of the outer cylinder 6;

[0030] A piston plate 13 is slidably provided on the upper inner circle of the sampling tube 9, a one-way air valve 14 is provided at the center of the piston plate 13, a straight hole 15 penetrating the interior of the sampling tube 9 is opened at the center of the drilling hydraulic motor 8, an L-shaped hole 16 is provided inside the piston rod of the drilling hydraulic cylinder 7, the lower end of the L-shaped hole 16 is connected to the upper end of the straight hole 15, the upper end of the L-shaped hole 16 faces backward and is connected to a pipe joint passing through the outer cylinder 6, and a sealing cap is provided at the outer end of the pipe joint.

[0031] The detachable material guide seal assembly includes a material guide cylinder 17 coaxially assembled inside the lower port of the sampling tube 9, the inner circle of the material guide cylinder 17 is composed of an upper cylindrical section 18, a middle conical section 19 and a lower cylindrical section 20 from top to bottom, the diameter of the upper cylindrical section 18 is larger than the diameter of the lower cylindrical section 20, the middle conical section 19 is a conical surface with a thick upper part and a thin lower part, the upper end diameter of the middle conical section 19 is equal to the diameter of the upper cylindrical section 18, and the lower end diameter of the middle conical section 19 is equal to the diameter of the lower cylindrical section 20;

[0032] A disc 21 is provided at the upper end of the upper cylindrical section 18, and a plurality of material passing holes 22 are evenly arranged along the circumferential direction on the disc 21. A conical valve core 23 is provided on the middle conical section 19, and the diameter of the upper end of the valve core 23 is larger than the diameter of the lower end of the middle conical section 19 and smaller than the diameter of the upper end of the middle conical section 19. A guide rod 24 is vertically fixed at the center of the lower surface of the disc 21, and a guide hole 25 with an upper end opening is provided at the center of the valve core 23. The lower part of the guide rod 24 extends into the guide hole 25, and a compression spring 26 is sleeved on the guide rod 24. The upper and lower ends of the compression spring 26 are respectively pressed against the lower surface of the disc 21 and the upper end surface of the valve core 23. Under the action of the compression spring 26, the conical surface of the valve core 23 is sealed with the conical surface of the middle conical section 19; a flexible sheath 27 is provided between the lower surface of the disc 21 and the upper surface of the valve core 23 to completely cover the compression spring 26;

[0033] The guide cylinder 17 and the sampling tube 9 are connected as a whole by a plurality of radially arranged countersunk screws 28 on the outer circle of the sampling tube 9. The lower end of the guide cylinder 17 extends out of the lower end of the sampling tube 9. A plurality of diamond bits 29 are evenly arranged on the annular surfaces at the lower ends of the sampling tube 9 and the guide cylinder 17.

[0034] The guiding and positioning mechanism 5 includes four cross bars 30 and four positioning hydraulic cylinders 31 arranged at intervals. The four cross bars 30 are arranged in a circular array along the vertical center line of the square column 1. The inner end of each cross bar 30 is fixedly connected to a side surface of the square column 1. The outer end of each cross bar 30 is rotatably provided with a guide wheel 32. A connecting plate 33 is fixedly provided between two adjacent cross bars 30 on the outer side of the square column 1. A bottom plate 34 is provided at the inner end of the cylinder body of each positioning hydraulic cylinder 31. The bottom plate 34 is fixedly connected to the connecting plate 33 by bolts. A supporting reinforcing rod is provided between the outer ends of two adjacent cross bars 30.

[0035] Each supporting reinforcement rod comprises a first connecting rod 35, a second connecting rod 36, a supporting positioning ring 37, a third connecting rod 38 and a fourth connecting rod 39 which are coaxially connected in sequence. The first connecting rod 35 and the second connecting rod 36 bracket are detachably connected via a first flange bolt connection assembly 40, and the third connecting rod 38 and the fourth connecting rod 39 are detachably connected via a second flange bolt connection assembly 41.

[0036] The cylinder body of each positioning hydraulic cylinder 31 coaxially passes through a supporting positioning ring 37, and a cushion sleeve is provided between the outer circle of the cylinder body of the positioning hydraulic cylinder 31 and the inner circle of the supporting positioning ring 37. The outer end of the piston rod of each positioning hydraulic cylinder 31 is detachably connected to an arc-shaped top plate 43 through a third flange bolt connection assembly 42, and a plurality of nails 44 are evenly arranged on the outer circle of the arc-shaped top plate 43.

[0037] The specific process of using the utility model to take samples includes the following steps:

[0038] (1) First, vacuumize the inside of the sampling tube 9. The specific process of vacuuming is as follows: first remove the sealing cap, then connect the outer port of the pipe joint to the vacuum pump's suction pipe, start the vacuum pump, and vacuumize the sampling tube 9 through the suction pipe, pipe joint, L-shaped hole 16, straight hole 15 and the one-way air valve 14 on the piston plate 13. When the vacuum pressure reaches 500-1000pa, turn off the vacuum pump, remove the suction pipe, and screw on the sealing cap. Then connect the lifting wire rope of the hoist of the wellhead drilling frame of the coalbed methane well to the lifting ring of the sampling device.

[0039] (2) The sampling device is lowered along the coalbed methane wellbore to the required sampling depth; when the sampling device is lowered along the coalbed methane wellbore, the directional wheels of the upper and lower guide and positioning mechanisms 5 roll downward along the inner wall of the wellbore, so that the entire sampling device is lowered stably.

[0040] (3) On the ground, the four positioning hydraulic cylinders 31 are controlled by a hydraulic station to extend simultaneously. The piston rods of the positioning hydraulic cylinders 31 drive the arc-shaped top plate 43 to extend in the radial direction of the wellbore until the outer dome of the arc-shaped top plate 43 presses against the inner wall of the wellbore and the nails 44 are driven into the inner wall of the wellbore, thereby positioning the square column 1 and the drilling sampler 3.

[0041] (4) On the ground, the sampling hydraulic motor 4 is started by controlling the hydraulic station. The sampling hydraulic motor 4 drives the drilling sampler 3 to rotate 90° through the rotating shaft 10 until the drilling sampler 3 is perpendicular to the center line of the wellbore, and then the sampling hydraulic motor 4 is turned off.

[0042] (5) On the ground, the hydraulic station controls the drilling hydraulic motor 8 and the drilling hydraulic cylinder 7 to start. The drilling hydraulic motor 8 drives the sampling tube 9 and the detachable material guide sealing assembly to rotate at high speed. The drilling hydraulic cylinder 7 drives the hydraulic motor, the sampling tube 9 and the detachable material guide sealing assembly to move outward along the outer cylinder 6. The balls 12 on the annular retainer 11 on the outer circle of the sampling tube 9 rotate at high speed and roll outward on the inner circle of the outer cylinder 6. The diamond cutter head 29 at the outer end of the sampling tube 9 and the material guide cylinder 17 drills perpendicularly to the inner wall of the wellbore. The coal sample entering the material guide cylinder 17 moves inward along the axial direction of the material guide cylinder 17. As the sampling tube 9 and the material guide cylinder 17 continue to drill, the coal sample entering the material guide cylinder 17 applies an inward push pressure to the lower end of the conical valve core 23. When the push pressure is greater than the elastic force of the spring, the valve core 23 is driven to compress the spring 2. 6. The valve core 23 moves inward along the guide rod 24, and the annular gap between the conical outer circle of the valve core 23 and the middle conical section 19 gradually increases. The coal sample enters the upper cylindrical section 18 through the annular gap, and then enters the sampling tube 9 through the evenly distributed feeding holes 22 on the disc 21, until the drilling hydraulic cylinder 7 is extended to the set limit, the drilling hydraulic cylinder 7 begins to retract. At this time, the coal sample inside the lower cylindrical section 20 no longer generates a top pressure on the lower end of the conical valve core 23. Under the action of the compression spring 26, the valve core 23 is driven to move outward along the guide rod 24, and the coal sample in the annular gap is squeezed into the lower cylindrical section 20. The annular gap gradually decreases until the conical outer circle of the valve core 23 is crimped with the inner circle of the middle conical section 19, and the port of the sampling tube 9 is sealed. After the drilling hydraulic cylinder 7 is retracted to the shortest, the drilling hydraulic cylinder 7 and the drilling hydraulic motor 8 are closed.

[0043] (6) Start the sampling hydraulic motor 4, which drives the drilling sampler 3 to rotate 90° in the opposite direction through the rotating shaft 10, until the drilling sampler 3 rotates back to the inside of the square column 1 and is parallel to the square column 1, and then the sampling hydraulic motor 4 is turned off; then start the positioning hydraulic cylinder 31, and the piston rod of the positioning hydraulic cylinder 31 drives the arc-shaped top plate 43 to shrink along the radial direction of the wellbore, and the outer circle of the arc-shaped top plate 43 is separated from the inner wall of the wellbore, until the piston rod of the positioning hydraulic cylinder 31 retracts to the original state and then turns off the positioning hydraulic cylinder 31, and then starts the hoist to lift the entire sampling device upward to above the wellhead.

[0044] (7) Remove the sampling device from the lower end of the wire rope of the hoist, rotate the lower end of the drilling sampler 3 to the outside of the square column 1, first unscrew the sealing cap at the outer end of the pipe joint, connect the pipe joint to the air pump, and then unscrew the screw 28 connecting the outer circle of the lower end of the sampling tube 9 and the guide cylinder 17, pull the guide cylinder 17, the disc 21 and the valve core 23 downward to remove the sampling tube 9, then immediately extend the lower end of the sampling tube 9 into the mouth of the coal sample tank, and use a flexible material to seal the outer circle of the sampling tube 9 and the mouth of the coal sample tank, and then start the air pump. The high-pressure airflow generated by the air pump enters the sampling tube 9 through the pipe joint, the L-shaped hole 16, and the straight hole 15. Since the one-way air valve 14 on the piston plate 13 can only be used to draw a vacuum outward, the high-pressure airflow generated by the air pump pushes the piston plate 13 to slide downward in the sampling tube 9. The piston plate 13 pushes the coal sample in the sampling tube 9 and pushes the coal sample from the lower end of the sampling tube 9 into the coal sample tank. The tank cover of the coal sample tank is closed to complete the entire sampling work. The air pump is turned off and disconnected from the pipe joint. A long rod is used to push the piston into the sampling tube 9 for a distance. Finally, the material guide cylinder 17, the disc 21 and the valve core 23 are installed to the lower end of the sampling tube 9, and the screws 28 are tightened to fix the material guide cylinder 17 and the sampling tube 9 together for the next sampling.

[0045] The hoist of the wellhead drilling frame of the coalbed methane well involved in the utility model, and the control of the opening and closing of each hydraulic cylinder and hydraulic motor through the hydraulic station on the ground are all existing technologies, and the specific contents are not repeated here.

[0046] The above two embodiments do not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model belong to the protection scope of the technical solution of the utility model.

Claims

1. A lifting and rotating sampling device for coalbed methane wells, characterized in that: It includes a vertically arranged square column, a lifting ring connected to a lifting wire rope is fixedly provided at the upper end of the square column, a long installation hole which is transparent from front to back is opened in the height direction of the square column, the length of the long installation hole is smaller than the diameter of the coalbed methane wellbore, a drilling sampler which is parallel to the square column is rotatably arranged in the long installation hole, a sampling hydraulic motor for driving the drilling sampler to rotate in the front-rear direction is provided on the side of the square column, and a group of guiding and positioning mechanisms are respectively provided above and below the long installation hole on the side of the square column.

2. The coalbed methane well lifting and rotating sampling device according to claim 1 is characterized in that: The drilling sampler comprises an outer cylinder with an open lower end, wherein a drilling hydraulic cylinder, a drilling hydraulic motor and a sampling tube are arranged in sequence from top to bottom in the outer cylinder, the lower end of the telescopic rod of the drilling hydraulic cylinder is connected to the top of the drilling hydraulic motor, the power output shaft of the drilling hydraulic motor is coaxially connected to the upper end of the sampling tube, and a detachable material guide sealing assembly is arranged inside the lower end of the sampling tube; a rotating shaft rotatably connected to a square column is fixedly arranged on the left and right sides of the middle of the outer cylinder, and the sampling hydraulic motor is connected to the rotating shaft on the left or right side; A plurality of annular retainers are evenly arranged at the middle and upper part of the outer circle of the sampling tube, and each annular retainer is provided with a plurality of balls which are rollingly connected with the inner wall of the outer cylinder; A piston plate is slidably provided on the upper part of the inner circle of the sampling tube, a one-way air valve is provided at the center of the piston plate, a straight hole penetrating the inside of the sampling tube is opened at the center of the drilling hydraulic motor, an L-shaped hole is provided inside the piston rod of the drilling hydraulic cylinder, the lower port of the L-shaped hole is connected with the upper port of the straight hole, the upper port of the L-shaped hole faces backward and is connected to a pipe joint passing through the outer cylinder body, and a sealing cap is provided at the outer end of the pipe joint.

3. The coalbed methane well lifting and rotating sampling device according to claim 2 is characterized in that: The detachable material guide sealing assembly comprises a material guide cylinder coaxially assembled inside the lower port of the sampling tube, the inner circle of the material guide cylinder is composed of an upper cylindrical section, a middle conical section and a lower cylindrical section from top to bottom, the diameter of the upper cylindrical section is larger than the diameter of the lower cylindrical section, the middle conical section is a conical surface with a thick upper part and a thin lower part, the diameter of the upper end of the middle conical section is equal to the diameter of the upper cylindrical section, and the diameter of the lower end of the middle conical section is equal to the diameter of the lower cylindrical section; A disc is provided at the upper port of the upper cylindrical section, and a plurality of feeding holes are provided on the disc which are evenly arranged along the circumferential direction. A conical valve core is provided at the middle cone section, and the diameter of the upper end of the valve core is larger than the diameter of the lower port of the middle cone section and smaller than the diameter of the upper port of the middle cone section. A guide rod is vertically fixed at the center of the lower surface of the disc, and a guide hole with an upper opening is provided at the center of the valve core. The lower part of the guide rod extends into the guide hole, and a compression spring is sleeved on the guide rod. The upper and lower ends of the compression spring are respectively press-connected with the lower surface of the disc and the upper end surface of the valve core. Under the action of the compression spring, the conical surface of the valve core is sealed with the conical surface of the middle cone section; a flexible sheath which completely covers the compression spring is provided between the lower surface of the disc and the upper surface of the valve core.

4. The coalbed methane well lifting and rotating sampling device according to claim 3 is characterized in that: The guide cylinder and the sampling tube are connected as a whole through a plurality of radially arranged countersunk screws on the outer circle of the sampling tube. The lower end of the guide cylinder is connected to the lower port of the sampling tube. A plurality of diamond bits are evenly arranged on the annular surfaces at the lower ends of the sampling tube and the guide cylinder.

5. The coalbed methane well lifting and rotating sampling device according to any one of claims 1 to 4, characterized in that: The guiding and positioning mechanism includes four cross bars and four positioning hydraulic cylinders arranged at intervals. The four cross bars are arranged in a circular array along the vertical center line of the square column. The inner end of each cross bar is fixedly connected to a side surface of the square column. The outer end of each cross bar is rotatably provided with a guide wheel. A connecting plate is fixedly provided between two adjacent cross bars on the outer side of the square column. A bottom plate is provided at the inner end of the cylinder body of each positioning hydraulic cylinder. The bottom plate is fixedly connected to the connecting plate by bolts. A supporting reinforcing rod is provided between the outer ends of two adjacent cross bars. Each supporting reinforcement rod comprises a first connecting rod, a second connecting rod, a supporting positioning ring, a third connecting rod and a fourth connecting rod which are coaxially connected in sequence, the first connecting rod and the second connecting rod bracket are detachably connected via a first flange bolt connection assembly, and the third connecting rod and the fourth connecting rod are detachably connected via a second flange bolt connection assembly; The cylinder body of each positioning hydraulic cylinder coaxially passes through a supporting positioning ring, a sleeve is provided between the outer circle of the cylinder body of the positioning hydraulic cylinder and the inner circle of the supporting positioning ring, the outer end of the piston rod of each positioning hydraulic cylinder is detachably connected to an arc-shaped top plate through a third flange bolt connection assembly, and a number of nails are evenly arranged on the outer circle of the arc-shaped top plate.

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