Coal-bed gas well gas sampling device

Abstract

The utility model provides a coal-bed gas well gas sampling device, and relates to the technical field of coal-bed gas well exploration. The coal-bed gas well gas sampling device comprises a shell, a base is fixedly connected to the lower surface of the shell, a movable plate is slidably connected to the inner wall of the shell, a lifting mechanism is arranged in the movable plate, and a gas exchange mechanism is arranged on the base. According to the coal-bed gas well gas sampling device, the underground depth of the lower end of the gas inlet pipe is adjusted, the gas exchange mechanism exhausts residual air in the gas inlet pipe, and after gas in the shell is replaced, the adjusting plate is rotated to enable the collecting mechanism to store and collect the gas, so that the purpose of collecting the gas at multiple positions is achieved; therefore, the problems that only one gas storage device is generally arranged in the prior art, only one position can be sampled each time, one-time multi-time comparison sampling is inconvenient, and sampling is inaccurate due to the fact that gas left in last sampling remains in a pipeline are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sampling device, concretely is a coal bed gas well gas sampling device, belongs to the technical field of coal bed gas well survey. BACKGROUND

[0002] The coal bed gas well is a special type of oil and gas well for exploiting coal bed gas, the coal bed gas is a natural gas adsorbed in the coal bed, and the main component is methane, the development and utilization of the coal bed gas not only can provide clean energy, but also can help reducing the coal mine gas accident and improving the coal mine safety production level, during the exploitation of the coal bed gas, the gas sample needs to be collected regularly to monitor the component and content change of the coal bed gas, to ensure the safety and high efficiency of the exploitation process, which generally uses the gas sampling device.

[0003] The existing gas sampling device generally uses the suction pump to cooperate with the pipeline to suck out the gas in the gas well, and then collects the gas from the upper part to realize the purpose of collecting the gas, but the existing one is generally provided with only one gas storage device, can only sample one position each time, is inconvenient for one-time multiple comparison sampling, and the pipeline still remains the gas stored during the last sampling, so that the sampling is inaccurate, therefore, the coal bed gas well gas sampling device is provided to solve the above problems. UTILITY MODEL CONTENT

[0004] In order to solve the above problems, the utility model provides a coal bed gas well gas sampling device to solve the above problems, and the specific technical scheme is:

[0005] A coal bed gas well gas sampling device, including the casing, the lower surface of casing is fixedly connected with base, the inner wall of casing is slidably connected with movable plate, the inside of movable plate is provided with lifting mechanism, the base is provided with gas exchange mechanism, the lower surface of base is connected with air inlet pipe, the outer surface of casing is slidably connected with adjusting plate, the outside of adjusting plate is provided with collection mechanism.

[0006] Preferably, the inner wall of the casing is fixedly installed with a sealing ring, and the outer surface of the sealing ring is slidably connected with the movable plate.

[0007] Preferably, the outer surface of the casing is fixedly installed with a limiting ring, and the lower surface of the limiting ring is slidably connected with the adjusting plate, and the lower surface of the adjusting plate is slidably connected with the base.

[0008] Preferably, the lifting mechanism comprises a support plate, both ends of the support plate are fixedly connected with the casing, a hydraulic rod is installed on the lower surface of the support plate, and the telescopic end of the hydraulic rod is connected with the inner bottom wall of the movable plate.

[0009] Preferably, the air exchange mechanism comprises a motor, the motor is installed at the bottom of the base, the output end of the motor penetrates the base and is connected with a rotating plate, the lower surface of the rotating plate is in sliding connection with the base.

[0010] Preferably, the inner wall of the base is provided with an air inlet and an air outlet, and the air inlet pipe is located at the lower part of the air inlet.

[0011] Preferably, the collecting mechanism comprises an air outlet cylinder, the air outlet cylinder is fixedly installed outside the adjusting plate, the outer surface of the air outlet cylinder is threadedly connected with a gas storage bag, and the inner wall of the shell is provided with a flow hole.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1、the coal bed gas well gas sampling device sets up air exchange mechanism and collection mechanism and other components, first uses the air exchange mechanism to discharge the air remaining in the air inlet pipe, when the gas entering the shell is the gas needing to be sampled in the well, the adjusting plate is rotated, the collection mechanism is used for storing and collecting the gas, when different positions in the well need to be collected, the depth of the lower end of the air inlet pipe in the well is adjusted, and the above steps are repeated, so that the gas collection of multiple positions is realized, the convenience is increased, the problem that the existing general device is only provided with one gas storage device and can only sample one position at a time is solved, one-time multiple comparison sampling is not convenient, and the gas remaining in the pipeline after the last sampling is stored, so that the sampling is not accurate.

[0014] 2、the coal bed gas well gas sampling device sets up lifting mechanism and sealing ring and other components, the supporting plate is used for supporting and fixing the hydraulic rod, when the hydraulic rod is elongated or shortened, the movable plate can be driven to move downward or upward, so that the size of the space at the lower part of the movable plate is changed, the material of the sealing ring is rubber, the sealing property between the movable plate and the shell can be increased, the air at the lower part of the movable plate is prevented from flowing out from the upper part, and use is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the overall structure schematic view of the utility model;

[0016] Figure 2 It is the sectional view of the shell in the utility model;

[0017] Figure 3 It is the sectional view of the adjusting plate in the utility model;

[0018] Figure 4 It is the explosion structure schematic view of the rotating plate in the utility model;

[0019] Figure 5 It is the three-dimensional structure schematic view of the collection mechanism in the utility model.

[0020] Figure descriptions: 1. Housing; 2. Base; 3. Movable plate; 4. Lifting mechanism; 401. Support plate; 402. Hydraulic rod; 5. Ventilation mechanism; 501. Electric motor; 502. Rotating plate; 503. Air inlet; 504. Air outlet; 6. Air inlet pipe; 7. Adjusting plate; 8. Collection mechanism; 801. Air outlet cylinder; 802. Air storage bag; 803. Flow hole; 9. Sealing ring; 10. Limiting ring; 11. Support rod. Detailed Implementation

[0021] The present invention will now be further described with reference to the accompanying drawings.

[0022] Please see Figures 1-5 The system includes a housing 1, a base 2 fixedly connected to the lower surface of the housing 1, a movable plate 3 slidably connected to the inner wall of the housing 1, a lifting mechanism 4 inside the movable plate 3, a ventilation mechanism 5 on the base 2, an air inlet pipe 6 connected to the lower surface of the base 2, an adjusting plate 7 slidably connected to the outer surface of the housing 1, and a collection mechanism 8 outside the adjusting plate 7. The base 2 is used to support the housing 1, and three support rods 11 are also installed at the lower part of the base 2 to support the base 2 and the components thereon, so as to stabilize it near the wellhead. The movable plate 3 is cylindrical in shape and hollow inside with an opening at the top. The lifting mechanism 4 can drive the movable plate 3 to move up and down inside the housing 1. The air inlet pipe 6 can be bent. In use, the end of the air inlet pipe 6 is placed into the well, and gas samples can be taken from different depths depending on the length below.

[0023] A sealing ring 9 is fixedly installed on the inner wall of the housing 1. The outer surface of the sealing ring 9 is slidably connected to the movable plate 3. The material of the sealing ring 9 is rubber, which can increase the sealing between the movable plate 3 and the housing 1 to prevent air from flowing out from the bottom of the movable plate 3.

[0024] A limiting ring 10 is fixedly installed on the outer surface of the housing 1. The lower surface of the limiting ring 10 is slidably connected to the adjusting plate 7, and the lower surface of the adjusting plate 7 is slidably connected to the base 2. The limiting ring 10 is circular in shape. The adjusting plate 7 is restricted in the middle by the limiting ring 10 and the base 2, so as to limit the stability of the adjusting plate 7 and prevent it from shifting.

[0025] The lifting mechanism 4 includes a support plate 401, both ends of which are fixedly connected to the housing 1. A hydraulic rod 402 is installed on the lower surface of the support plate 401. The telescopic end of the hydraulic rod 402 is connected to the inner bottom wall of the movable plate 3. The support plate 401 is used to support and fix the hydraulic rod 402. When the hydraulic rod 402 extends or retracts, it can drive the movable plate 3 to move downward or upward, thereby changing the size of the space under the movable plate 3.

[0026] The ventilation mechanism 5 comprises an electric motor 501 installed at the bottom of the base 2, the output end of the electric motor 501 penetrates the base 2 and is connected with a rotating plate 502, the lower surface of the rotating plate 502 is in sliding connection with the base 2, the electric motor 501 is a servo motor, and auxiliary components such as a speed changer are further arranged as required, the electric motor 501 can drive the rotating plate 502 to rotate, the angle of rotation can be controlled, and the bottom of the rotating plate 502 is in close contact with the base 2, so that the sealing effect between the rotating plate 502 and the base 2 is increased.

[0027] The inner wall of the base 2 is provided with an air inlet 503 and an air outlet 504, the air inlet pipe 6 is located at the lower part of the air inlet 503, the air inlet 503 and the air outlet 504 can be sealed by the rotating plate 502, the length from the air inlet 503 to the center of the rotating plate 502 is the same as the length from the air outlet 504 to the center of the rotating plate 502, and a circular hole is further arranged on the rotating plate 502, which can coincide with the air inlet 503 or the air outlet 504 when the rotating plate 502 rotates.

[0028] The collecting mechanism 8 comprises air outlet cylinders 801 fixedly installed outside the adjusting plate 7, the outer surface of the air outlet cylinder 801 is threadedly connected with a gas storage bag 802, the inner wall of the shell 1 is provided with a flow-through hole 803, and the air outlet cylinder 801 is provided in plurality, gas can enter the inside of the gas storage bag 802 through the air outlet cylinder 801 after being discharged from the flow-through hole 803, so that the gas is stored and collected, the gas storage bag 802 is composed of a bag body and a connecting port on the bag body, the gas storage bag 802 can be screwed on the air outlet cylinder 801, and the air in the bag needs to be squeezed out before the gas storage bag 802 is installed each time.

[0029] The electric motor 501 in the application is a common electrical device in the prior art, and the model or internal structure thereof will not be described in detail, and the electric motor 501 can be replaced by other power sources.

[0030] The utility model discloses when using: the device is placed to the well mouth side, makes air inlet pipe 6 to extend to the well, then motor 501 drives rotating plate 502 to rotate, when the round hole on rotating plate 502 coincides with air inlet 503, lift mechanism 4 drives movable plate 3 to move upwards, make the inside of shell 1 produce negative pressure to make the air in air inlet pipe 6 enter the inside of shell 1, then rotating plate 502 rotates and seals air inlet 503, the round hole on rotating plate 502 rotates to air outlet 504, movable plate 3 moves downwards, extrudes the air in the inside of shell 1 from air outlet 504, repeatedly above-mentioned steps, thereby realize the air that remains in air inlet pipe 6 is discharged, when the gas that enters the inside of shell 1 is the gas that needs to sample in the well, seals air inlet 503 and air outlet 504 completely, rotates adjusting plate 7, makes adjusting plate 7 drive its on gas storage bag 802 move to flow -through hole 803, under the action of movable plate 3, make the air in the inside of shell 1 extrude to the inside of gas storage bag 802 and store and collect, through the continuous rotation of adjusting plate 7, can collect multiple samples.

[0031] When needing to collect different positions in the well, rotating adjusting plate 7 seals flow -through hole 803, adjusts the depth of air inlet pipe 6 lower end in the well, repeatedly above-mentioned steps again, through the air exchange mechanism 5, the air in the inside of shell 1 and the air in the inside of air inlet pipe 6 are replaced, and the gas collection mechanism 8 is used to the gas collection in the inside of shell 1, to realize the purpose of gas collection to multiple positions, increase convenience.

[0032] The technical principles of the utility model are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the utility model, and cannot be explained as the limitation of the protection scope of the utility model in any way. Based on the explanation here, the person skilled in the art can think of other specific embodiments of the utility model without creative labor, and these ways will fall into the protection scope of the claims of the utility model.

Claims

1. A coal bed methane gas well gas sampling device comprising a housing (1) characterised in that: The lower surface of the shell (1) is fixedly connected with the base (2), the inner wall of the shell (1) is slidably connected with the movable plate (3), the inside of the movable plate (3) is provided with the lifting mechanism (4), the base (2) is provided with the ventilation mechanism (5), the lower surface of the base (2) is connected with the air inlet pipe (6), the outer surface of the shell (1) is slidably connected with the adjusting plate (7), and the outside of the adjusting plate (7) is provided with the collecting mechanism (8).

2. The coal bed gas well gas sampling device of claim 1, wherein: The inner wall of the shell (1) is fixedly connected with the sealing ring (9), and the outer surface of the sealing ring (9) is slidably connected with the movable plate (3).

3. The coal bed gas well gas sampling device of claim 1, wherein: The outer surface of the shell (1) is fixedly connected with the limiting ring (10), the lower surface of the limiting ring (10) is slidably connected with the adjusting plate (7), and the lower surface of the adjusting plate (7) is slidably connected with the base (2).

4. The coal bed gas well gas sampling device of claim 1, wherein: The lifting mechanism (4) comprises a supporting plate (401), both ends of the supporting plate (401) are fixedly connected with the shell (1), and the lower surface of the supporting plate (401) is provided with a hydraulic rod (402).

5. The coal bed gas well gas sampling device of claim 1, wherein: The ventilation mechanism (5) comprises a motor (501), the motor (501) is installed at the bottom of the base (2), the output end of the motor (501) penetrates the base (2) and is connected with a rotating plate (502), and the lower surface of the rotating plate (502) is slidably connected with the base (2).

6. A coal bed gas well gas sampling device according to claim 5, wherein: The inner wall of the base (2) is provided with an air inlet (503) and an air outlet (504), and the air inlet pipe (6) is located at the lower part of the air inlet (503).

7. The coal bed gas well gas sampling device of claim 1, wherein: The collecting mechanism (8) comprises an air outlet cylinder (801), the air outlet cylinder (801) is fixedly installed outside the adjusting plate (7), the outer surface of the air outlet cylinder (801) is threadedly connected with a gas storage bag (802), and the inner wall of the shell (1) is provided with a flow hole (803).

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