Sampling device for geological exploration of shale gas

Abstract

The utility model relates to the technical field of shale gas sampling devices, in particular to a sampling device for geological exploration of shale gas, which comprises a gas cylinder, a one-way valve, a gas inlet, a gas outlet, a spiral adsorption belt, a sealing piston and a piston driving part, one end of the inflator is connected with an air inlet, and a one-way valve is arranged between the air inlet and the inflator; an air outlet for exhausting air is formed in the air cylinder; a sealing piston is arranged in the air cylinder, and a piston driving piece used for driving the sealing piston is connected to the sealing piston; a limiting part used for limiting the stroke of the sealing piston is arranged on the side, away from the air inlet, in the air cylinder. A spiral adsorption belt is arranged between the sealing piston and the side, away from the piston driving part, of the air cylinder, when the sealing piston is pulled to sample air and store the air into the air cylinder, the spiral adsorption belt can adsorb and filter solid impurities in the sampled air, meanwhile, the axial size of the air cylinder is not additionally increased, and the portability is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of shale gas sampling devices, in particular to a sampling device for shale gas geological exploration. Background Art

[0002] Shale gas can exist in a free state in natural cracks and pores, and in an adsorbed state on the surface of kerogen and clay particles. Therefore, in the initial excavation and exploration sampling stage, because there is no large-scale advanced equipment yet, the samples must be transported to a laboratory far away from the exploration site for sample analysis. When the sampled gas contains a lot of solid impurities such as gravel and crushed stone, it is easy to damage the sampling device, especially the storage equipment, causing the sampled gas to leak, affecting the analysis results, and also easily causing safety accidents.

[0003] Most of the small portable sampling devices for shale gas geological exploration in the prior art have the advantages of simple structure and convenient operation, but often lack effective filtration of sampled gas impurities, or can effectively filter sampled gas impurities but are large in size and inconvenient to carry and use in harsh geophysical exploration environments. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides a sampling device for shale gas geological exploration, comprising: a gas cylinder, a one-way valve, an air inlet, an air outlet, a spiral adsorption belt, a sealing piston and a piston driving member;

[0005] One end of the gas cylinder is connected to an air inlet, and a one-way valve is provided between the air inlet and the gas cylinder;

[0006] The gas cylinder is provided with an air outlet for exhausting gas;

[0007] A sealing piston is provided in the gas cylinder, and a piston driving member for driving the sealing piston is connected to the sealing piston;

[0008] A limiting portion for limiting the travel of the sealing piston is provided on one side of the gas cylinder away from the gas inlet;

[0009] A spiral adsorption belt is provided between the sealing piston and the side of the air cylinder away from the piston driving member. The spiral adsorption belt is a multi-layer spiral belt structure, and the spiral adsorption belt is made of loose porous material. One end of the spiral adsorption belt is fixed on the sealing piston, and the other end is fixed on the side of the air cylinder facing the air inlet.

[0010] Preferably, the piston drive member includes a rotating shaft structure, an avoidance gap and an L-shaped rod, the sealing piston is hingedly mounted with an L-shaped rod via the rotating shaft structure on the side away from the air inlet, and the air cylinder is provided with an avoidance gap for avoiding the L-shaped rod on the side away from the air inlet.

[0011] Preferably, the outer wall of the gas cylinder is provided with a clamping seat for clamping the L-shaped rod, and the clamping seat comprises two elastic plates arranged in parallel, and the ends of the two elastic plates are inclined and bent toward each other.

[0012] Preferably, a ball head larger than the diameter of the L-shaped rod is provided at the end of the L-shaped rod, and a hand pattern for increasing gripping friction is provided on the surface of the L-shaped rod.

[0013] Preferably, a filter screen for filtering solid impurities is provided on the air inlet, and a chamfer for facilitating the installation of other interfaces is provided on the outer wall of the air inlet.

[0014] Preferably, the rotating shaft structure and the rotating part of the L-shaped rod are provided with a torsion spring, and the initial elastic force direction of the torsion spring is the direction driving the L-shaped rod and the air cylinder to be parallel.

[0015] Compared with the prior art, the utility model provides a sampling device for shale gas geological exploration, which has the following beneficial effects:

[0016] 1. A spiral adsorption belt is provided between the sealing piston and the side of the gas cylinder away from the piston driving member. The spiral adsorption belt is a multi-layer spiral belt structure, and the spiral adsorption belt is made of a loose porous material. Therefore, when the sealing piston is pulled out to sample the gas and store it into the gas cylinder, the spiral adsorption belt can absorb and filter the solid impurities in the sampled gas, while the axial size of the gas cylinder is not increased, thereby maintaining the portability.

[0017] 2. The cooperation of the rotating shaft structure, the avoidance notch and the L-shaped rod can fold the L-shaped rod around the avoidance notch, reduce the axial size, and facilitate carrying. At the same time, the avoidance notch can limit the sealing piston in both circumferential and axial directions, thereby improving the sealing performance and the life of the sealing piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the utility model in a state where no gas is stored;

[0020] Figure 3 This is a schematic diagram of the utility model in a state after gas storage.

[0021] In the figure: 1. air cylinder; 2. one-way valve; 3. air inlet; 4. L-shaped rod; 5. ball head; 6. clamping seat; 7. limit part; 8. sealing piston; 9. avoidance gap; 10. filter screen; 11. spiral adsorption belt; 12. chamfer. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example

[0024] Reference Figure 1 The utility model provides a sampling device for shale gas geological exploration, comprising: a gas cylinder 1, a one-way valve 2, an air inlet 3, an air outlet, a spiral adsorption belt 11, a sealing piston 8 and a piston driving member;

[0025] One end of the gas cylinder 1 is connected to an air inlet 3, and a one-way valve 2 is provided between the air inlet 3 and the gas cylinder 1;

[0026] The gas cylinder 1 is provided with an air outlet for exhausting gas;

[0027] A sealing piston 8 is provided in the gas cylinder 1, and a piston driving member for driving the sealing piston 8 is connected to the sealing piston 8;

[0028] A limiting portion 7 for limiting the travel of the sealing piston 8 is provided on one side of the cylinder 1 away from the air inlet 3;

[0029] A spiral adsorption belt 11 is provided between the sealing piston 8 and the side of the gas cylinder 1 away from the piston driving member. The spiral adsorption belt 11 is a multi-layer spiral belt structure, and the spiral adsorption belt 11 is made of loose porous material. One end of the spiral adsorption belt 11 is fixed on the sealing piston 8, and the other end is fixed on the side of the gas cylinder 1 facing the air inlet 3.

[0030] When the sealing piston 8 is pulled out to sample the gas and store it into the gas cylinder 1, the spiral adsorption belt 11 can absorb and filter the solid impurities in the sampled gas without additionally increasing the axial size of the gas cylinder 1, thereby maintaining portability.

[0031] The piston driving member includes a rotating shaft structure, an avoidance notch 9 and an L-shaped rod 4. The sealing piston 8 is hingedly mounted with the L-shaped rod 4 on the side away from the air inlet 3 through the rotating shaft structure. The side of the air cylinder 1 away from the air inlet 3 is provided with an avoidance notch 9 for avoiding the L-shaped rod 4. The cooperation of the rotating shaft structure, the avoidance notch 9 and the L-shaped rod 4 allows the L-shaped rod 4 to bypass the avoidance notch 9 and be folded, thereby reducing the axial size and making it easy to carry. At the same time, the avoidance notch 9 can limit the sealing piston 8 in both the circumferential and axial directions, thereby improving the sealing performance and the life of the sealing piston 8.

[0032] The purpose of the piston driver is to drive the sealing piston 8 to slide in the cylinder 1 to sample air or test air. In some embodiments, the piston driver may also use other types, such as a self-locking worm gear or a screw structure.

[0033] The outer wall of the gas cylinder 1 is provided with a clamping seat 6 for clamping the L-shaped rod 4. The clamping seat 6 includes two elastic plates arranged in parallel, and the ends of the two elastic plates are inclined and bent toward each other.

[0034] A ball head 5 larger than the diameter of the L-shaped rod 4 is provided at the end of the L-shaped rod 4. The ball head 5 can be used as a handle for pushing and pulling the sealing piston 8 for easy holding, while reducing the pressure on the hand and improving the overall comfort of use. The surface of the L-shaped rod 4 is provided with hand lines for increasing the friction of holding.

[0035] The air inlet 3 is provided with a filter screen 10 for filtering solid impurities. In order to isolate larger solid impurities such as gravel and crushed stones in the sampled gas, the outer wall of the air inlet 3 is provided with a chamfer 12 for facilitating the installation of other interfaces, which is convenient and also convenient for docking with other pipelines.

[0036] The rotating parts of the rotating shaft structure and the L-shaped rod 4 are provided with a torsion spring. The initial elastic force direction of the torsion spring is to drive the L-shaped rod 4 and the gas cylinder 1 to be parallel. The torsion spring can form a cooperation with the clamping seat 6 to support the L-shaped rod 4, reduce the gap between the L-shaped rod 4 and the clamping seat 6 to produce a movable clearance, avoid collision between the L-shaped rod 4 and the gas cylinder 1 during transportation and storage, avoid deformation of the gas cylinder 1, and reduce collision noise.

[0037] Reference Figure 2 and Figure 3 When in use, open the air outlet, hold the L-shaped rod 4, push the sealing piston 8 to the dead point position on one side of the air inlet 3, align the air inlet 3 with the sampling point, prepare for sampling, close the air outlet, hold the L-shaped rod 4, push the sealing piston 8 away from the air inlet 3, negative pressure is generated in the air cylinder 1, and the gas enters the air cylinder 1 from the air inlet 3 through the one-way valve 2, and the sealing piston 8 is pushed to the limiting portion 7. At this time, the L-shaped rod 4 is bent around the rotating shaft structure, the L-shaped rod 4 is folded around the avoidance notch 9, and the L-shaped rod 4 is clamped and fixed with the clamping seat 6. At this time, the L-shaped rod 4 and the axis of the air cylinder 1 are parallel, reducing the overall axial size and facilitating carrying. At the same time, the avoidance notch 9 can form a limit in both the circumferential and axial directions for the sealing piston 8, avoiding relative rotation between the sealing piston 8 and the air cylinder 1 during transportation, thereby generating friction, thereby improving the overall sealing performance and the life of the sealing piston 8.

[0038] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sampling device for shale gas geological exploration, characterized in that: include: An air cylinder (1), a one-way valve (2), an air inlet (3), an air outlet, a spiral adsorption belt (11), a sealing piston (8), and a piston driving member; One end of the gas cylinder (1) is connected to an air inlet (3), and a one-way valve (2) is provided between the air inlet (3) and the gas cylinder (1); The gas cylinder (1) is provided with an air outlet for exhausting gas; The gas cylinder (1) is provided with a sealing piston (8), and the sealing piston (8) is connected to a piston driving member for driving the sealing piston (8); A limiting portion (7) for limiting the travel of the sealing piston (8) is provided on a side of the gas cylinder (1) away from the gas inlet (3); A spiral adsorption belt (11) is provided between the sealing piston (8) and the side of the gas cylinder (1) away from the piston driving member. The spiral adsorption belt (11) is a multi-layer spiral belt structure and is made of a loose porous material. One end of the spiral adsorption belt (11) is fixed to the sealing piston (8), and the other end is fixed to a side of the gas cylinder (1) facing the gas inlet (3).

2. A sampling device for shale gas geological exploration according to claim 1, characterized in that: The piston drive member comprises a rotating shaft structure, an avoidance notch (9) and an L-shaped rod (4); the sealing piston (8) is hingedly mounted with the L-shaped rod (4) on a side away from the air inlet (3) via the rotating shaft structure; and the cylinder (1) is provided with an avoidance notch (9) for avoiding the L-shaped rod (4) on a side away from the air inlet (3).

3. A sampling device for shale gas geological exploration according to claim 1, characterized in that: The outer wall of the gas cylinder (1) is provided with a clamping seat (6) for clamping the L-shaped rod (4), and the clamping seat (6) comprises two elastic plates arranged in parallel, and the ends of the two elastic plates are inclined and bent towards each other.

4. A sampling device for shale gas geological exploration according to claim 2, characterized in that: The end of the L-shaped rod (4) is provided with a ball head (5) having a diameter larger than that of the L-shaped rod (4), and the surface of the L-shaped rod (4) is provided with hand lines for increasing gripping friction.

5. The sampling device for shale gas geological exploration according to claim 1, characterized in that: The air inlet (3) is provided with a filter screen (10) for filtering solid impurities.

6. A sampling device for shale gas geological exploration according to claim 2, characterized in that: The rotating shaft structure and the rotating part of the L-shaped rod (4) are provided with a torsion spring, and the initial elastic force direction of the torsion spring is the direction that drives the L-shaped rod (4) and the air cylinder (1) toward parallelism.

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