Pulverized coal fishing device

Abstract

The utility model belongs to the technical field of coal bed gas exploitation, and discloses a pulverized coal fishing device. The pulverized coal fishing device comprises a collecting pipe, a partition plate and a filtering pore plate. The end of the collecting pipe is used for being connected with a pulverized coal fishing pipe column. The partition plate is arranged in the collecting pipe and divides the interior of the collecting pipe into a first collecting cavity and a filtering cavity in the length direction, and the first collecting cavity is used for containing pulverized coal; negative pressure can be formed in the first collecting cavity, and the partition plate can rotate under the action of the negative pressure, so that the first collecting cavity communicates with the filtering cavity; the filtering pore plate is arranged at the end part of the filtering cavity, filtering pores through which pulverized coal passes are formed in the filtering pore plate, and the pore diameter of the filtering pores is smaller than the particle size of corrosive slag. According to the pulverized coal fishing device, corrosive slag can be filtered, the slag is prevented from entering the collecting pipe to affect the sealing performance of the valve ball seat above the collecting pipe, and then the fishing quality and fishing efficiency of pulverized coal are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of coal bed gas mining, in particular to a coal powder scooping device. Background Art

[0002] In the process of coalbed methane production and drainage, horizontal wells have gradually become the main well type for development. In the process of drainage, sand and coal powder will often be discharged in the well after gas production. As the fracturing sand and coal powder are discharged in the horizontal section of the wellbore, deposits will usually form in the well, causing wellbore blockage and increasing the resistance to gas and water flow, resulting in the inability to efficiently discharge coal powder in the reservoir, thereby affecting the coalbed methane production capacity of the production well.

[0003] In the existing coalbed methane drainage process, a coal powder catching pump is usually used in conjunction with a spring one-way valve to salvage and collect coal powder in horizontal wells. The key to the efficiency of this method of catching coal powder lies in the sealing of the valve seat in the pipe string. If the valve seat is effectively sealed, the coal powder mixed fluid scooped out of the pipe string can be smoothly brought to the ground. However, if the valve seat is blocked by underground debris and cannot be reset or the seal is lost, the coal powder mixed fluid scooped out of the pipe string will be completely lost, resulting in the failure of the coal powder catching operation.

[0004] Therefore, how to reduce or even eliminate the impact of underground corrosive slag on the efficiency of coal powder dredging in coalbed methane horizontal wells is a technical problem that needs to be solved urgently. Utility Model Content

[0005] The utility model aims to provide a coal powder catching device, which can catch coal powder underground and effectively improve the catching quality and catching efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a coal powder scooping device, comprising:

[0008] Preferably, a collecting pipe, the end of which is used to connect with a coal powder collecting pipe column;

[0009] a partition, the partition being arranged in the collecting pipe, the partition sealing the interior of the collecting pipe into a first collecting chamber and a filtering chamber along the length direction, the first collecting chamber being used for accommodating coal powder;

[0010] Negative pressure can be formed in the first collecting chamber, and the partition can rotate under the action of the negative pressure to connect the first collecting chamber with the filtering chamber;

[0011] A filter plate is provided at the end of the filter cavity, and filter holes for the coal powder to pass through are formed on the filter plate, wherein the aperture of the filter holes is smaller than the particle size of the corrosive slag.

[0012] Preferably, the collecting pipe further comprises a second collecting chamber, the second collecting chamber is connected with the filtering chamber through the filter holes on the filtering plate, and the second collecting chamber is used to accommodate the corrosive slag;

[0013] A cover plate is arranged in the second collecting chamber, and the cover plate can be rotated to block the second collecting chamber.

[0014] Preferably, the coal powder collecting device further comprises a first elastic member, the first elastic member is arranged in the second collecting chamber, and the first elastic member is connected to the cover plate;

[0015] The first elastic member is used to apply elastic force to the cover plate, so that the cover plate always has a movement tendency to rotate to block the second collecting chamber.

[0016] Preferably, the cover plate abuts against the side wall of the collecting tube at an angle to the radial plane of the collecting tube to seal the second collecting chamber.

[0017] Preferably, a sealing rubber ring is provided on the edge of the cover plate.

[0018] Preferably, the end of the collecting tube located in the second collecting chamber is an inclined cut.

[0019] Preferably, the filter plate is arranged at an angle to a radial plane of the collecting tube.

[0020] Preferably, the coal powder scooping device further comprises a second elastic member, the second elastic member is arranged on the collecting pipe, and the second elastic member is connected to the partition;

[0021] The second elastic member is used to apply elastic force to the partition, so that the partition always has a movement tendency to rotate to seal the first collecting chamber and the filtering chamber.

[0022] Preferably, a sieve hole for the coal powder to pass through is provided on the side wall of the collecting pipe corresponding to the filter cavity, and the aperture of the sieve hole is smaller than the particle size of the corrosive slag.

[0023] Preferably, a sealing rubber ring is provided on the edge of the partition.

[0024] The beneficial effects of the utility model are:

[0025] The utility model provides a coal dust scooping device, in which a collecting pipe is connected to a coal dust scooping pipe column. Since negative pressure can be generated in the first collecting chamber and the partition can rotate under the action of negative pressure to connect the first collecting chamber and the filter chamber, when the coal dust scooping pump on the coal dust scooping pipe column is turned on for suction, the partition can automatically rotate, so that the filter chamber can negatively absorb the coal dust and corrosive slag and the like outside the collecting pipe; since a filter hole plate is provided at the end of the filter chamber, filter holes for the coal dust to pass through are provided on the filter hole plate, and the aperture of the filter hole is smaller than the particle size of the corrosive slag and the like. diameter, so corrosive debris cannot enter the filter chamber through the filter hole plate, thereby preventing the debris from entering the collection pipe and affecting the sealing performance of the upper valve ball seat, thereby ensuring the quality and efficiency of coal powder salvage; the coal powder entering the filter chamber will continue to enter the first collecting chamber under the suction action of the coal powder salvage pump in the coal catching pipe column, so after the salvage is completed and the coal powder salvage pump is turned off, the coal powder is sealed in the first collecting chamber by the partition, and the coal powder in the collection pipe can be salvaged from the well by lifting the coal catching pipe column, which greatly facilitates the operation of the construction personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a coal powder scooping device provided in a specific implementation manner of the utility model.

[0027] In the figure:

[0028] 1-collecting tube; 11-first collecting chamber; 12-filtering chamber; 13-second collecting chamber; 14-sieve hole;

[0029] 2-partition;

[0030] 3-filter plate; 31-filter hole;

[0031] 4-cover plate;

[0032] 5-first elastic member;

[0033] 6-Second elastic member. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figure 1As shown, the utility model provides a coal powder scooping device, which includes a collecting pipe 1, a partition 2 and a filter hole plate 3, the end of the collecting pipe 1 is used to connect with the coal powder scooping pipe column; the partition 2 is arranged in the collecting pipe 1, and the partition 2 separates the interior of the collecting pipe 1 into a first collecting chamber 11 and a filter chamber 12 along the length direction, and the first collecting chamber 11 is used to accommodate coal powder; negative pressure can be formed in the first collecting chamber 11, and the partition 2 can rotate under the action of the negative pressure to connect the first collecting chamber 11 and the filter chamber 12; the filter hole plate 3 is arranged at the end of the filter chamber 12, and the filter hole plate 3 is provided with a filter hole 31 for coal powder to pass through, and the aperture of the filter hole 31 is smaller than the particle size of the corrosive slag. In this embodiment, the collecting pipe 1 is connected to the coal dust collecting column. Since negative pressure can be generated in the first collecting chamber 11 and the partition 2 can rotate under the action of negative pressure to connect the first collecting chamber 11 and the filter chamber 12, when the coal dust collecting pump on the coal dust collecting column is turned on for suction, the partition 2 can automatically rotate, so that the filter chamber 12 can negatively absorb the coal dust and corrosive slag outside the collecting pipe 1; since a filter hole plate 3 is provided at the end of the filter chamber 12, a filter hole 31 for the coal dust to pass through is opened on the filter hole plate 3, and the aperture of the filter hole 31 is smaller than the particle size of the corrosive slag. diameter, so corrosive debris cannot enter the filter chamber 12 through the filter hole plate 3, thereby preventing the debris from entering the collecting pipe 1 and affecting the sealing performance of the upper valve ball seat, thereby ensuring the coal powder salvage quality and efficiency; the coal powder entering the filter chamber 12 will continue to enter the first collecting chamber 11 under the suction action of the coal powder catching pump in the coal catching pipe column, so after the salvage is completed and the coal powder catching pump is turned off, the coal powder is sealed in the first collecting chamber 11 by the partition 2, and the coal powder in the collecting pipe 1 can be salvaged from the well by lifting the coal powder catching pipe column, which greatly facilitates the operation of the construction personnel. Specifically, the upper end of the collecting pipe 1 is provided with an external thread, which can be threadedly connected to the upper coal powder catching pipe column. A coal powder catching pump is provided on the coal powder catching pipe column. During the coal powder catching process, the coal powder catching pump is started to form a negative pressure in the collecting pipe 1 through the coal powder catching pipe column, thereby sucking the coal powder mixed with corrosive slag in the horizontal well section; since a filter hole plate 3 is provided at the end of the filter chamber 12, the particle size of the coal powder is much smaller than the particle size of the corrosive slag, and the filter hole plate 3 only allows the coal powder to enter the filter chamber 12, and at this time, since the partition plate 2 is also rotated and opened under the action of negative pressure, the coal powder will continue to enter the first collecting chamber 11 for temporary storage, thereby preventing the corrosive slag from entering the upper coal powder catching pipe column through the collecting pipe 1 and damaging the valve seat therein.

[0039] Furthermore, if Figure 1As shown, the collecting pipe 1 also has a second collecting chamber 13, which is connected to the filter chamber 12 through the filter holes 31 on the filter hole plate 3, and the second collecting chamber 13 is used to accommodate corrosive debris; a cover plate 4 is arranged in the second collecting chamber 13, and the cover plate 4 can rotate to block the second collecting chamber 13. In this embodiment, the interior of the collecting pipe 1 is sequentially divided into a first collecting chamber 11, a filter chamber 12 and a second collecting chamber 13 along the length direction, and a partition plate 2 is arranged between the first collecting chamber 11 and the filter chamber 12, and the partition plate 2 is used to connect or isolate the first collecting chamber 11 and the filter chamber 12; a filter hole plate 3 is arranged between the filter chamber 12 and the second collecting chamber 13, and the filter holes 31 on the filter hole plate 3 can allow the coal powder in the second collecting chamber 13 to enter the filter chamber 12, while the corrosive debris is retained in the second collecting chamber 13. Specifically, when the coal powder scooping operation is carried out, the cover plate 4 in the second collecting chamber 13 is opened, and the second collecting chamber 13 is connected to the horizontal well section. The negative pressure generated by the coal powder scooping pump will open the partition 2, and the coal powder mixed with corrosive debris in the horizontal well section will be sucked into the second collecting chamber 13. The coal powder entering the second collecting chamber 13 will continue to enter the filter chamber 12 through the filter hole 31 along the length direction of the collecting pipe 1 under the action of negative pressure, and finally enter the first collecting chamber 11 for temporary storage, while the corrosive debris is retained in the second collecting chamber 13, thereby completing the separate scooping of coal powder and corrosive debris; thereafter, the cover plate 4 and the partition 2 are closed, and the coal powder and corrosive debris are stored in the first collecting chamber 11 and the second collecting chamber 13 respectively and taken out of the wellbore, thereby successfully completing the scooping of coal powder; and since the corrosive debris is also scooped out of the wellbore at the same time as the coal powder is scooped, the underground working environment is greatly improved, and the corrosion and damage to underground equipment in the later coalbed methane drainage process is reduced.

[0040] Specifically, Figure 1As shown, the coal dust scooping device also includes a first elastic member 5, which is arranged in the second collection chamber 13 and connected to the cover plate 4; the first elastic member 5 is used to apply elastic force to the cover plate 4, so that the cover plate 4 always has a movement tendency to rotate to block the second collection chamber 13. In this embodiment, the first elastic member 5 is a spring clip that always has an opening tendency, one side of the first elastic member 5 is fixed on the inner wall surface of the collection pipe 1, and the other side of the first elastic member 5 abuts on the cover plate 4, and the cover plate 4 is rotatably arranged in the second collection chamber 13 through a pin shaft. The cover plate 4 can rotate in the direction opposite to the flow of coal dust in the second collection chamber 13 under the elastic force of the first elastic member 5 to block the second collection chamber 13, and at the same time, a first stop block is also arranged on the inner wall of the collection pipe 1 corresponding to the second collection chamber 13, and the cover plate 4 can abut on the first stop block when blocking the second collection chamber 13, thereby locking the position of the cover plate 4. It can be understood that when the coal powder catching pipe string is lowered, the coal powder mixed with corrosive debris in the horizontal well section will enter the second collecting chamber 13 as the coal powder catching device is extended. The cover plate 4 is pushed by the coal powder and corrosive debris in front and will overcome the elastic force of the first elastic member 5 and rotate in the direction of the mixture flow to open, so that the coal powder and corrosive debris can enter the second collecting chamber 13 between the filter plate 3 and the cover plate 4. After that, when the coal powder catching pipe string is lowered to the specified position, the staff starts the coal powder catching pump, and the coal powder catching device will salvage the coal powder; when the coal powder is salvaged, the staff turns off the coal powder catching pump and lifts up the coal powder catching pipe string at the same time. At this time, the partition 2 will be closed to seal the first collecting chamber 11 and the filter chamber 12, and the cover plate 4 will also be closed under the action of the elastic force of the first elastic member 5, thereby sealing the corrosive debris in the second collecting chamber 13 to bring it out of the wellbore.

[0041] Specifically, Figure 1 As shown, the cover plate 4 is angled with the radial plane of the collecting pipe 1 against the side wall of the collecting pipe 1 to block the second collecting chamber 13. In this embodiment, the collecting pipe 1 is a regular cylindrical structure, and the cover plate 4 is arranged in the second collecting chamber 13 at an acute angle with the axis of the collecting pipe 1. When the coal powder scooping device enters the horizontal well section and touches the mixture of coal powder and corrosive slag, the mixture can enter the second collecting chamber 13 between the cover plate 4 and the filter plate 3 through the elliptical inlet after the cover plate 4 is opened. The area of ​​the elliptical inlet is larger than the area of ​​the cross section of the second collecting chamber 13, so the scooping operation of coal powder and corrosive slag can be accelerated; specifically, the angle between the cover plate 4 and the axis of the collecting pipe 1 is 30° to 50°.

[0042] Specifically, a sealing rubber ring is provided at the edge of the cover plate 4. In this embodiment, the sealing rubber ring can improve the sealing between the cover plate 4 and the side wall of the collecting pipe 1, and can effectively prevent the corrosive slag in the second collecting chamber 13 from leaking when the coal powder scooping device is lifted.

[0043] Specifically, Figure 1 As shown, the end of the collecting pipe 1 located in the second collecting chamber 13 is an inclined cut. In this embodiment, the end of the collecting pipe 1 is designed as an inclined cut with a sharp end, which is conducive to the lowering of the coal powder catching device in the wellbore and the forward and backward movement to avoid drill jamming. At the same time, the design of the inclined cut increases the flow rate of the mixture of coal powder and corrosive slag, thereby speeding up the salvage operation.

[0044] Furthermore, if Figure 1 As shown, the filter plate 3 is arranged at an angle to the radial plane of the collecting pipe 1. In this embodiment, the filter plate 3 is arranged between the filter chamber 12 and the second collecting chamber 13 at an acute angle to the axis of the collecting pipe 1, that is, the filter plate 3 is an elliptical structure, the area of ​​the ellipse is larger than the cross-sectional area of ​​the filter chamber 12, and more filter holes 31 are arranged on the elliptical filter plate 3, so that the flow rate of the coal powder can be increased, thereby speeding up the coal powder salvage operation. Specifically, the angle between the filter plate 3 and the axis of the collecting pipe 1 is 30° to 50°.

[0045] Furthermore, if Figure 1 As shown, the coal powder scooping device also includes a second elastic member 6, which is disposed on the collecting tube 1 and connected to the partition 2; the second elastic member 6 is used to apply an elastic force to the partition 2 so that the partition 2 always has a movement tendency to rotate to seal the first collecting chamber 11 and the filter chamber 12. In this embodiment, the second elastic member 6 has the same structure as the first elastic member 5, and both are spring clips that always have an opening tendency. One side of the second elastic member 6 is fixed to the inner wall surface of the collecting tube 1, and the other side of the second elastic member 6 abuts against the partition 2. The partition 2 is rotatably disposed on the inner wall surface of the collecting tube 1 through a pin shaft. The partition 2 can rotate in a direction opposite to the flow direction of the coal powder in the filter chamber 12 under the elastic force of the second elastic member 6 to seal the first collecting chamber 11 and the filter chamber 12. At the same time, a second stop block is also disposed on the inner wall surface of the collecting tube 1. , the partition 2 can abut against the second stop block when isolating the first collection chamber 11 and the filter chamber 12, thereby locking the position of the partition 2; it is understandable that when the coal powder scooping pump is started, the negative pressure force on the partition 2 can overcome the elastic force of the second elastic member 6, so that it will rotate and open along the direction of the coal powder flow, and then the coal powder enters the first collection chamber 11 for storage; when the coal powder scooping pump is turned off, the partition 2 will be closed again under the elastic force of the second elastic member 6, thereby isolating the coal powder in the first collection chamber 11 and taking it out of the wellbore. In another embodiment, the first elastic member 5 and the second elastic member 6 are compression springs.

[0046] Furthermore, if Figure 1As shown, a sieve hole 14 for coal powder to pass through is provided on the side wall of the collecting pipe 1 corresponding to the filter cavity 12, and the aperture of the sieve hole 14 is smaller than the particle size of the corrosive slag. In this embodiment, a sieve hole 14 is provided on the side wall of the pipe section of the collecting pipe 1 located in the filter cavity 12, and the sieve hole 14 is used for coal powder to pass through and can block the corrosive slag; when the coal powder scooping pump is started, the coal powder scooping device can simultaneously absorb coal powder through the sieve hole 14 and the filter hole 31 on the filter plate 3, thereby greatly improving the coal powder scooping efficiency.

[0047] Furthermore, a sealing rubber ring is provided at the edge of the partition 2. In this embodiment, the sealing rubber ring can improve the sealing between the partition 2 and the side wall of the collecting pipe 1, and can effectively prevent the coal powder in the first collecting chamber 11 from leaking when the coal powder scooping device is lifted.

[0048] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A coal powder scooping device, characterized in that: include: A collecting pipe (1), the end of which is used to be connected to a coal powder collecting pipe column; a partition (2), the partition (2) being arranged in the collecting pipe (1), the partition (2) sealing the interior of the collecting pipe (1) along the length direction into a first collecting chamber (11) and a filtering chamber (12), the first collecting chamber (11) being used for accommodating coal powder; Negative pressure can be formed in the first collecting chamber (11), and the partition (2) can rotate under the action of the negative pressure to enable the first collecting chamber (11) and the filtering chamber (12) to communicate with each other; A filter plate (3), the filter plate (3) being arranged at the end of the filter cavity (12), the filter plate (3) being provided with filter holes (31) for the coal powder to pass through, the aperture of the filter hole (31) being smaller than the particle size of the corrosive slag.

2. The coal powder scooping device according to claim 1, characterized in that: The collecting pipe (1) further comprises a second collecting chamber (13), the second collecting chamber (13) being in communication with the filtering chamber (12) via the filtering holes (31) on the filtering plate (3), the second collecting chamber (13) being used for accommodating the corrosive slag; A cover plate (4) is arranged in the second collecting chamber (13), and the cover plate (4) is rotatable to seal the second collecting chamber (13).

3. The coal powder scooping device according to claim 2, characterized in that: The coal powder scooping device further comprises a first elastic member (5), wherein the first elastic member (5) is arranged in the second collecting chamber (13), and the first elastic member (5) is connected to the cover plate (4); The first elastic member (5) is used to apply an elastic force to the cover plate (4) so ​​that the cover plate (4) always has a movement tendency to rotate to seal the second collecting chamber (13).

4. The coal powder scooping device according to claim 2, characterized in that: The cover plate (4) abuts against the side wall of the collecting tube (1) at an angle with the radial plane of the collecting tube (1) to seal the second collecting chamber (13).

5. The coal powder scooping device according to claim 4, characterized in that: A sealing rubber ring is provided on the edge of the cover plate (4).

6. The coal powder scooping device according to claim 2, characterized in that: The end of the collecting tube (1) located in the second collecting chamber (13) is an inclined cutout.

7. The coal powder scooping device according to claim 1, characterized in that: The filter plate (3) is arranged at an angle to the radial plane of the collecting tube (1).

8. The coal powder scooping device according to claim 1, characterized in that: The coal powder scooping device further comprises a second elastic member (6), wherein the second elastic member (6) is arranged on the collecting pipe (1), and the second elastic member (6) is connected to the partition plate (2); The second elastic member (6) is used to apply an elastic force to the partition (2) so that the partition (2) always has a movement tendency to rotate to seal the first collecting chamber (11) and the filtering chamber (12).

9. The coal powder scooping device according to claim 1, characterized in that: The side wall of the collecting pipe (1) corresponding to the filter cavity (12) is provided with a sieve hole (14) for the coal powder to pass through, and the aperture of the sieve hole (14) is smaller than the particle size of the corrosive slag.

10. The coal powder scooping device according to any one of claims 1 to 9, characterized in that: A sealing rubber ring is provided on the edge of the partition (2).

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