Wellhead dustproof device for coal bed gas air drilling

Abstract

The utility model discloses a coal bed gas air drilling well mouth anti-dust device which comprises a sand discharging pipe and a flow slowing pipe, a gradually-expanding air inlet pipe is arranged between the sand discharging pipe and the flow slowing pipe, and a dust falling pipe is fixedly installed at the end, away from the gradually-expanding air inlet pipe, of the flow slowing pipe. The flow equalizing assembly is used for improving the uniformity of gas flowing into the dust falling pipe from the flow slowing pipe, the dust falling assembly is used for removing dust of the gas, subjected to flow equalizing through the flow equalizing assembly, in the dust falling pipe, and the flow equalizing assembly comprises a protection box fixedly connected to the interior of the sand discharging pipe and a driving motor arranged in the protection box; the output end of the driving motor penetrates through the protection box and is fixedly connected with a flow equalizing plate, and flow equalizing filtering holes are evenly formed in the flow equalizing plate. Through cooperation of the sand discharging pipe, the flow slowing pipe, the gradually-expanding air inlet pipe, the dust falling pipe, the flow equalizing assembly, the dust falling assembly and the flow discharging pipe, the dust removing effect of the device can be effectively improved.

Description

Technical Field

[0001] The utility model relates to a dust-proof device, in particular to a dust-proof device for a coalbed methane air drilling wellhead. Background Art

[0002] Air drilling is widely used in coalbed methane extraction due to its high efficiency and speed. However, this technology faces a significant problem in practical application: the large amount of dust and gravel generated during the drilling process. These substances not only pose a serious threat to the health of operators, but also pollute the surrounding environment and affect the normal operation and efficiency of drilling equipment.

[0003] In the existing technology, the spraying method is mostly used to remove dust from the air flow discharged from the air drilling wellhead. However, since the air flow velocity discharged from the air drilling wellhead is relatively high and the air flow itself is uneven, the dust removal effect is limited when there is a lot of sand and gravel in the air flow. Utility Model Content

[0004] In order to solve the defects of the existing technology that the air flow velocity discharged from the air drilling wellhead is high and the air flow itself is uneven, so the dust removal effect is limited when there is a lot of sand and gravel in the air flow, the utility model provides a coalbed methane air drilling wellhead dust prevention device.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The utility model discloses a dust prevention device for coalbed methane air drilling wellhead, comprising a sand discharge pipe and a slow flow pipe, a gradually diverging air inlet pipe is provided between the sand discharge pipe and the slow flow pipe, a dust reduction pipe is fixedly installed on one end of the slow flow pipe away from the gradually diverging air inlet pipe, a flow equalizing component for improving the uniformity of gas flowing from the slow flow pipe into the dust reduction pipe and a dust reduction component for removing dust from the gas in the dust reduction pipe after being equalized by the flow equalizing component;

[0007] The flow balancing assembly includes a protective box fixedly connected to the sand discharge pipe and a driving motor arranged in the protective box. The output end of the driving motor passes through the protective box and is fixedly connected to a flow balancing plate. The flow balancing plate is evenly provided with flow balancing filtering holes.

[0008] A discharge pipe is provided at the bottom of the dust suppression pipe away from one end of the slow flow pipe.

[0009] As a preferred technical solution of the present invention, arc-shaped baffles are evenly and alternately arranged on the inner top wall and the inner bottom wall of the slow-flow tube.

[0010] As an optimal technical solution of the present invention, the dust reduction component includes a spray pipe arranged in the dust reduction pipe and a water inlet pipe for connecting the spray pipe with an external water source. The part of the surface of the spray pipe located in the dust reduction pipe is evenly provided with spray nozzles connected to the spray pipe.

[0011] As an optimal technical solution of the present invention, the bottom of the outer wall of the dust reduction pipe is located between the flow equalizing plate and the slow flow pipe and is fixedly connected to a screw conveyor, and the inner wall of the dust reduction pipe is provided with an opening for connecting the dust reduction pipe and the screw conveyor close to the screw conveyor.

[0012] As a preferred technical solution of the present invention, an inclined scraper is provided on the side of the inner wall of the dust suppression pipe close to the opening.

[0013] As a preferred technical solution of the present invention, reinforcing ribs are evenly arranged on the side of the outer wall of the flow equalizing plate close to the drive motor.

[0014] The beneficial effects of the utility model are:

[0015] 1. This coalbed methane air drilling wellhead dust prevention device, through the cooperation of the sand discharge pipe, slow flow pipe, gradually expanding air inlet pipe, dust reduction pipe, flow equalization component, dust reduction component and discharge pipe, the gradually expanding air inlet pipe can initially reduce the airflow velocity, and after the airflow velocity is reduced, the flow equalization component makes the airflow more uniform, and then the dust reduction component sprays the uniform airflow after the velocity is reduced to remove dust, thereby effectively improving the dust removal effect of the device;

[0016] 2. This coalbed methane air drilling wellhead dust prevention device, through the cooperation of the screw conveyor, opening and inclined scraper, prevents some of the larger diameter rock fragments entrained in the airflow from passing through the flow-equalizing filter holes and are partially stuck in the flow-equalizing filter holes under the push of the airflow. As the drive motor continuously drives the flow-equalizing plate to rotate, the inclined scraper can scrape off some of the rock fragments stuck in the flow-equalizing filter holes and enter the screw conveyor through the opening, and then be discharged through the screw conveyor, thereby minimizing the problem that large rock fragments cannot be properly captured by water droplets and separated from the airflow after passing through the dust reduction component due to their own large mass and inertia;

[0017] 3. This type of coalbed methane air drilling wellhead dust prevention device, through the setting of the arc baffle, can further disrupt the airflow when the airflow flows through the slow flow pipe, thereby further reducing the gas flow rate and improving the dust removal effect when the airflow flows through the dust reduction component. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a coalbed methane air drilling wellhead dust prevention device of the utility model;

[0020] Figure 2 This is a side sectional structural diagram of a coalbed methane air drilling wellhead dust prevention device of the utility model;

[0021] Figure 3 This is a schematic diagram of the opening structure of a coalbed methane air drilling wellhead dust prevention device of the utility model;

[0022] Figure 4 The utility model is a schematic diagram of the main cross-sectional structure of a coalbed methane air drilling wellhead dust prevention device.

[0023] In the figure: 1. Sand discharge pipe; 2. Slow flow pipe; 3. Gradual expansion air inlet pipe; 4. Dust reduction pipe; 5. Flow equalization component; 51. Protective box; 52. Drive motor; 53. Flow equalization plate; 54. Flow equalization filter hole; 6. Dust reduction component; 61. Spray pipe; 62. Water inlet pipe; 63. Spray nozzle; 7. Discharge pipe; 8. Arc baffle; 9. Screw conveyor; 10. Opening; 11. Inclined scraper; 12. Conical anti-cutting plate. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-4 While describing the preferred embodiments of the present invention, it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] Reference Figure 1 and Figure 2 The utility model discloses a dust prevention device for coalbed methane air drilling wellhead, comprising a sand discharge pipe 1 and a slow flow pipe 2. When in use, the sand discharge pipe 1 is first installed in the wellhead exhaust duct, and a gradually expanding air inlet pipe 3 is arranged between the sand discharge pipe 1 and the slow flow pipe 2. The end with a smaller radius of the gradually expanding air inlet pipe 3 is fixedly connected to the sand discharge pipe 1, and the end with a larger radius of the gradually expanding air inlet pipe 3 is fixedly installed in the slow flow pipe 2. When the gas passes through the sand discharge pipe 1 and enters the gradually expanding air inlet pipe 3, the inner diameter of the gradually expanding air inlet pipe 3 gradually increases, and the flow velocity of the gas is initially reduced after flowing through the gradually expanding air inlet pipe 3.

[0026] Reference Figure 1 and Figure 2A dust reduction pipe 4 is fixedly installed at one end of the slow flow pipe 2 away from the gradually diverging air inlet pipe 3, and arc-shaped baffles 8 are evenly and staggeredly arranged on the inner top wall and the inner bottom wall of the slow flow pipe 2. After the gas with initially reduced flow velocity enters the slow flow pipe 2 through the gradually diverging air inlet pipe 3, the arc-shaped baffle 8 can further disrupt the airflow when flowing through the slow flow pipe 2, thereby further reducing the gas flow velocity. The dust reduction pipe 4 is provided with a flow equalizing component 5 for improving the uniformity of the gas flowing from the slow flow pipe 2 into the dust reduction pipe 4 and a dust reduction component 6 for removing dust from the gas after being equalized by the flow equalizing component 5 inside the dust reduction pipe 4.

[0027] Reference Figure 2 、 Figure 3 and Figure 4 The flow balancing component 5 includes a protective box 51 fixedly connected to the sand discharge pipe 1 and a drive motor 52 arranged in the protective box 51. The outer wall of the protective box 51 is fixedly connected with a connecting rod around the periphery. The end of the connecting rod away from the protective box 51 is fixedly connected to the inner wall of the dust reduction pipe 4. The protective box 51 is fixedly installed in the dust reduction pipe 4 through the connecting rod.

[0028] The output end of the driving motor 52 passes through the protective box 51 and is fixedly connected to the flow equalizing plate 53. The flow equalizing filter holes 54 are evenly opened on the flow equalizing plate 53. The airflow after the flow velocity is reduced by the gradually expanding air inlet pipe 3 and the slow flow pipe 2 first enters the dust reduction pipe 4 and continues to flow away from the slow flow pipe 2, and passes through the flow equalizing filter holes 54 on the flow equalizing plate 53. At the same time, the driving motor 52 drives the flow equalizing plate 53 to rotate. The shear force and turbulence effect generated during the rotation of the flow equalizing plate 53 and the dispersion effect of the flow equalizing filter holes 54 on the gas can be used to make the airflow more uniform after passing through the flow equalizing filter holes 54.

[0029] Reference Figure 1 、 Figure 2 and Figure 3 , the bottom of the outer wall of the dust reduction pipe 4 is located between the flow equalizing plate 53 and the slow flow pipe 2 and is fixedly connected to a screw conveyor 9. The gap between the blades and the interior of the screw conveyor 9 should be as small as possible, thereby minimizing the airflow that has not passed through the dust reduction component 6 for dust reduction and is directly discharged into the air through the opening and the space between the blades and the inner wall of the screw conveyor 9. An opening 10 for connecting the dust reduction pipe 4 and the screw conveyor 9 is provided on the side of the inner wall of the dust reduction pipe 4 near the screw conveyor 9, and an inclined scraper 11 is provided on the side of the inner wall of the dust reduction pipe 4 near the opening 10;

[0030] When the air flow passes through the equalizing filter holes 54, some of the rock fragments with larger diameters entrained in the air flow cannot pass through the equalizing filter holes 54, and are partially stuck in the equalizing filter holes 54 under the push of the air flow. At this time, since the driving motor 52 continuously drives the equalizing plate 53 to rotate, the inclined scraper 11 can scrape off some of the rock fragments stuck in the equalizing filter holes 54, and enter the screw conveyor 9 through the opening 10, and then be discharged through the screw conveyor 9.

[0031] Reference Figure 2 , the dust reduction component 6 includes a spray pipe 61 arranged in the dust reduction pipe 4 and a water inlet pipe 62 for connecting the spray pipe 61 with an external water source. The surface of the spray pipe 61 located in the dust reduction pipe 4 is evenly provided with spray nozzles 63 connected to the spray pipe 61. The end of the spray pipe 61 close to the flow balancing component 5 is fixedly connected to the conical anti-cutting plate 12. The external water source is pumped to the water inlet pipe 62 by a water pump, and then enters the spray pipe 61 through the water inlet pipe 62 and is sprayed from the spray nozzle 63 into the external airflow to reduce dust on the airflow. When the gas flows to one side of the spray pipe 61, the conical anti-cutting plate 12;

[0032] A discharge pipe 7 is provided at the bottom of the dust reduction pipe 4 away from one end of the slow flow pipe 2. After the dust reduction component 6 reduces dust on the airflow, the water flow of the shoelace dust and the gas after dust reduction are discharged through the discharge pipe 7.

[0033] The workflow of this utility model is:

[0034] When in use, the sand discharge pipe 1 is first installed in the wellhead exhaust duct. The airflow carrying dust and gravel first enters the sand discharge pipe 1 through the wellhead exhaust duct, and then flows through the gradually diverging air inlet pipe 3, the slow flow pipe 2 and the dust suppression pipe 4 respectively, and is discharged through the discharge pipe 7. As the inner diameter of the gradually diverging air inlet pipe 3 gradually increases, the flow velocity of the gas is initially reduced after flowing through the gradually diverging air inlet pipe 3, and when flowing through the slow flow pipe 2, it passes through the arc baffle 8 to further disrupt the airflow and reduce the airflow velocity again.

[0035] After the airflow passes through the slow flow pipe 2 and enters the dust suppression pipe 4, the airflow with reduced flow velocity continues to flow away from the slow flow pipe 2 and passes through the flow equalization filter holes 54 on the flow equalization plate 53. At the same time, the driving motor 52 drives the flow equalization plate 53 to rotate. The shear force and turbulence effect generated during the rotation of the flow equalization plate 53 and the dispersion effect of the flow equalization filter holes 54 on the gas can make the airflow more uniform after passing through the flow equalization filter holes 54.

[0036] Some of the rock fragments with larger diameters entrained in the airflow cannot pass through the flow-equalizing filter holes 54, and are partially stuck in the flow-equalizing filter holes 54 under the push of the airflow. At this time, since the driving motor 52 continuously drives the flow-equalizing plate 53 to rotate, the inclined scraper 11 can scrape off some of the rock fragments stuck in the flow-equalizing filter holes 54, and enter the screw conveyor 9 through the opening 10, and then be discharged through the screw conveyor 9, thereby minimizing the problem that large rock fragments cannot be well captured by water droplets and separated from the airflow after passing through the dust reduction component due to their own large mass and inertia;

[0037] The air flow after passing through the flow-balancing filter holes 54 passes through the spray pipe 61 evenly. The external water source is pumped to the water inlet pipe 62 through the water pump, and then enters the spray pipe 61 through the water inlet pipe 62, and is sprayed into the external air flow from the spray nozzle 63 to reduce dust in the air flow. After dust reduction by the dust reduction component 6, the water body carrying sand and dust and the air flow after dust removal are discharged from the dust reduction pipe 4 through the discharge pipe 7.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dust prevention device for coalbed methane air drilling wellhead, comprising a sand discharge pipe (1) and a slow flow pipe (2), characterized in that: A gradually diverging air inlet pipe (3) is provided between the sand discharge pipe (1) and the slow flow pipe (2); a dust reduction pipe (4) is fixedly mounted on one end of the slow flow pipe (2) away from the gradually diverging air inlet pipe (3); and a flow equalizing component (5) for improving the uniformity of gas flowing from the slow flow pipe (2) into the dust reduction pipe (4) and a dust reduction component (6) for removing dust from the gas in the dust reduction pipe (4) after the gas has been equalized by the flow equalizing component (5). The flow balancing assembly (5) comprises a protective box (51) fixedly connected to the sand discharge pipe (1) and a driving motor (52) arranged in the protective box (51); the output end of the driving motor (52) passes through the protective box (51) and is fixedly connected to a flow balancing plate (53); and the flow balancing plate (53) is evenly provided with flow balancing filtering holes (54); A discharge pipe (7) is provided at the bottom of the dust suppression pipe (4) at one end away from the slow flow pipe (2).

2. A coalbed methane air drilling wellhead dust prevention device according to claim 1, characterized in that: The inner top wall and the inner bottom wall of the slow-flow pipe (2) are evenly and staggeredly provided with arc-shaped baffles (8).

3. A coalbed methane air drilling wellhead dust prevention device according to claim 2, characterized in that: The dust reduction assembly (6) comprises a spray pipe (61) arranged in the dust reduction pipe (4) and a water inlet pipe (62) for connecting the spray pipe (61) with an external water source, and spray nozzles (63) connected to the spray pipe (61) are evenly arranged on the surface of the spray pipe (61) located in the dust reduction pipe (4).

4. A coalbed methane air drilling wellhead dust prevention device according to claim 3, characterized in that: The bottom of the outer wall of the dust reduction pipe (4) is located between the flow equalizing plate (53) and the slow flow pipe (2) and is fixedly connected to a screw conveyor (9). The inner wall of the dust reduction pipe (4) is provided with an opening (10) on the side close to the screw conveyor (9) for connecting the dust reduction pipe (4) and the screw conveyor (9).

5. A coalbed methane air drilling wellhead dust prevention device according to claim 4, characterized in that: An inclined scraper (11) is provided on one side of the inner wall of the dust suppression pipe (4) close to the opening (10).

6. A coalbed methane air drilling wellhead dust prevention device according to claim 5, characterized in that: One end of the spray pipe (61) close to the flow balancing assembly (5) is fixedly connected to a conical anti-cutting plate (12).

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