CN112228145B

CN112228145B - A hydraulic punching and permeability enhancement device for underground low-permeability close-spaced coal seams and its use method

Info

Publication number: CN112228145B
Application number: CN202011229864.2A
Authority: CN
Inventors: 李朝; 李克相
Original assignee: Huaneng Yunnan Diandong Energy Co Ltd
Current assignee: Huaneng Yunnan Diandong Energy Co Ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2024-11-12
Anticipated expiration: 2040-11-06
Also published as: CN112228145A

Abstract

The invention discloses a hydraulic punching anti-reflection device for underground low permeability near coal seam groups and a use method thereof, comprising a drill rod, a punching drill bit, a directional drilling machine, a first high-pressure rubber tube, a high-pressure water injection pump, a second high-pressure rubber tube, a water tank and a water tube, wherein the first high-pressure rubber tube and the second high-pressure rubber tube are respectively arranged on a water outlet and a water inlet of the high-pressure water injection pump, the water tank is arranged on the second high-pressure rubber pipe, the water pipe is arranged on the water tank, the directional drilling machine is arranged on the first high-pressure rubber pipe, the drill rod is arranged on the directional drilling machine, the punching drill bit is arranged at the free end of the drill rod, and the punching drill bit is provided with a high-pressure water spraying hole. The invention relates to the technical field of coal uncovering, in particular to a hydraulic punching anti-reflection device for a downhole low-permeability close-range coal seam group and a use method thereof, and aims of safely uncovering coal and shortening the coal uncovering period are fulfilled.

Description

Downhole low permeability near coal seam group hydraulic punching anti-reflection device and use method

Technical Field

The invention relates to the technical field of coal uncovering, in particular to a hydraulic punching anti-reflection device for underground low-permeability close-range coal seams and a use method thereof.

Background

The risk of coal and gas outburst caused by cross-cut coal uncovering of the short-distance coal seam group with the outburst mine being soft and low permeability is high, the drilling extraction effect is poor, and the coal uncovering period is long. In order to ensure the coal uncovering safety and shorten the coal uncovering time, the coal mine in China mainly adopts hydraulic punching, hydraulic fracturing and deep hole presplitting blasting anti-reflection measures at present. When the hydraulic punching measure is adopted, a drilling hole penetrating through all coal beds is firstly constructed, the punching hole diameter is small, only a single coal bed is punched, only the hole opening of the drilling hole is connected with the external space, and only one passage for punching coal slag is used for punching coal with less quantity; when the hydraulic fracturing measure is adopted, all coal beds of the coal bed group are to be fractured, the phenomenon that the fracturing effect of the target coal bed is uncertain and the fracturing effect is not uniform exists, the directional drilling machine is not adopted for construction, and the permeability-increasing effect of the coal beds along the tunneling direction of the roadway is poor; when deep hole pre-splitting blasting measures are adopted, the explosive quantity is increased, and the safety risk is too high.

Disclosure of Invention

Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the hydraulic punching anti-reflection device for the underground low-permeability near-distance coal seam group and the application method thereof, so that the aims of safely uncovering coal and shortening the uncovering period are fulfilled.

The technical scheme adopted by the invention is as follows: the invention discloses a hydraulic punching anti-reflection device for underground low-permeability close-range coal seam groups, which comprises a drill rod, a punching drill bit, a directional drill, a first high-pressure rubber pipe, a high-pressure water injection pump, a second high-pressure rubber pipe, a water tank and a water pipe, wherein the first high-pressure rubber pipe and the second high-pressure rubber pipe are respectively arranged on a water outlet and a water inlet of the high-pressure water injection pump, the water tank is arranged on the second high-pressure rubber pipe, the water pipe is arranged on the water tank, the directional drill is arranged on the first high-pressure rubber pipe, the drill rod is arranged on the directional drill, the punching drill bit is arranged at the free end of the drill rod, and a high-pressure water spraying hole is formed in the punching drill bit.

Further, the drill rod is arranged in a hollow mode.

The invention also discloses a use method of the downhole low-permeability near-distance coal seam group hydraulic punching anti-reflection device, which comprises the following steps:

Firstly, in a coal seam group roof roadway, a directional drilling machine is started to construct a large-diameter drill hole which penetrates through the coal seam group and is communicated with the coal seam group roof roadway and the coal seam group floor roadway along the roadway construction direction through a punching drill bit;

Step two, a punching drill bit, a drill rod, a high-pressure rubber tube I, a high-pressure water injection pump, a high-pressure rubber tube II, a water tank and a water pipe are connected with each other to form a high-pressure flushing system, the drill rod is driven by a directional drilling machine, the drill rod drives the punching drill bit to be positioned to the lowest coal bed of the coal bed group, the high-pressure water injection pump is started, high-pressure water enters the punching drill bit through the high-pressure rubber tube I and the drill rod, finally enters the coal bed through a high-pressure water injection hole reserved in the punching drill bit to be hydraulically punched, the coal bed is broken under the action of the high-pressure water, coal is flushed out as much as possible along with the water flow entering the coal bed group bottom plate roadway, the coal flushing amount per meter is not less than 3t, and the air quantity of the coal bed group bottom plate roadway is increased to be not less than 1000m ³/min during the hydraulic punching;

and thirdly, after punching and anti-reflection of the lower coal seam are completed, punching and anti-reflection of other coal seams of the coal seam group are sequentially carried out from bottom to top.

Further, the diameter of the large diameter bore is greater than 153mm.

The beneficial effects obtained by the invention by adopting the structure are as follows: according to the scheme, hydraulic punching is adopted to carry out anti-reflection on a close-range coal seam group, a large amount of coal can be punched, a certain space is formed in the coal body, the coal body moves towards the formed space under the action of stress, so that the coal body is cracked, and the air permeability of the coal seam is increased; when punching the coal seam at the lower part of the close-range coal seam group, the method is equivalent to the partial exploitation of the protective layer, has the pressure relief effect on the adjacent upper coal seam, and sequentially performs punching operation on the coal seam group, so that the anti-reflection effect is more obvious; the directional drilling machine is adopted to construct a large-diameter drilling hole to communicate two existing roadways, and a slag discharging channel is punched, so that the coal quantity is large, and holes and spray holes are not easy to block; the flushed cinder is discharged from the lower roadway, and the construction site has good environment; the anti-reflection effect is good, the gas extraction amount is improved, and the coal uncovering time is effectively shortened; the drill hole is constructed along the tunneling direction to increase the permeability, so that the method is safer and more reliable; simple structure, easy operation of process flow and practical field.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of the overall structure of a hydraulic punching and permeability-increasing device for a downhole low permeability near coal seam group.

The drilling machine comprises a drill rod 1, a drill rod 2, a punching drill bit 3, a directional drilling machine 4, a first high-pressure rubber pipe 5, a high-pressure water injection pump 6, a second high-pressure rubber pipe 7, a water tank 8, a water pipe 9, a coal seam group roof roadway 10, a coal seam group floor roadway 11 and a large-diameter drill hole.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in fig. 1, the hydraulic punching anti-reflection device for the underground low permeability near coal seam group comprises a drill rod 1, a punching drill bit 2, a directional drilling machine 3, a first high-pressure rubber tube 4, a high-pressure water injection pump 5, a second high-pressure rubber tube 6, a water tank 7 and a water pipe 8, wherein the first high-pressure rubber tube 4 and the second high-pressure rubber tube 6 are respectively arranged on a water outlet and a water inlet of the high-pressure water injection pump 5, the water tank 7 is arranged on the second high-pressure rubber tube 6, the water pipe 8 is arranged on the water tank 7, the directional drilling machine 3 is arranged on the first high-pressure rubber tube 4, the drill rod 1 is arranged on the directional drilling machine 3, the punching drill bit 2 is arranged at the free end of the drill rod 1, and a high-pressure water spraying hole is formed in the punching drill bit 2.

The drill rod 1 is arranged in a hollow mode.

Firstly, in a coal seam group roof roadway 9, a directional drilling machine 3 is started to construct a large-diameter drilling hole 11 which penetrates through the coal seam group and is communicated with the coal seam group roof roadway 9 and a coal seam group floor roadway 10 along the roadway construction direction through a punching drill bit 2;

Step two, a punching drill bit 2, a drill rod 1, a high-pressure rubber tube I4, a high-pressure water injection pump 5, a high-pressure rubber tube II 6, a water tank 7 and a water pipe 8 are connected with each other to form a high-pressure flushing system, the drill rod 1 is driven by the directional drilling machine 3, the drill rod 1 drives the punching drill bit 2 to be positioned to the lowest coal seam of the coal seam group, the high-pressure water injection pump 5 is started, high-pressure water is injected into the coal seam through the high-pressure rubber tube I4 and the drill rod 1 and finally enters the punching drill bit 2, hydraulic punching is carried out on the coal seam through a high-pressure water injection hole left in the punching drill bit 2, the coal seam is broken under the action of the high-pressure water, coal is flushed out as much as possible along with water flowing down into a coal seam group bottom plate tunnel 10, the coal flushing amount per meter is not less than 3t, and the air quantity of the coal seam group bottom plate tunnel 10 is increased to not less than 1000m < 3/min during the hydraulic punching;

The diameter of the large diameter bore 11 is greater than 153mm.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. A method for using a hydraulic punching and permeability enhancement device for a low-permeability, close-spaced coal seam group underground, characterized in that the hydraulic punching and permeability enhancement device for a low-permeability, close-spaced coal seam group underground, comprises a drill rod, a punching drill bit, a directional drilling rig, a high-pressure hose 1, a high-pressure water injection pump, a high-pressure hose 2, a water tank and a water pipe, wherein the high-pressure hose 1 and the high-pressure hose 2 are respectively arranged on the water outlet and the water inlet of the high-pressure water injection pump, the water tank is arranged on the high-pressure hose 2, the water pipe is arranged on the water tank, the directional drilling rig is arranged on the high-pressure hose 1, the drill rod is arranged on the directional drilling rig, the punching drill bit is arranged on the free end of the drill rod, and the punching drill bit is provided with a high-pressure water spray hole;

The method of use comprises the following steps:

Step 1: In the roof roadway of the coal seam group, a directional drill is started to drill a large-diameter borehole through the coal seam group and connects the roof roadway of the coal seam group and the bottom roadway of the coal seam group along the roadway construction direction by using a punching drill bit, wherein the aperture of the large-diameter borehole is greater than 153 mm;

Step 2: The punching drill bit, drill rod, high-pressure hose 1, high-pressure water injection pump, high-pressure hose 2, water tank and water pipe are connected to each other to form a high-pressure water flushing system. The directional drilling rig is used to drive the drill rod, and the drill rod drives the punching drill bit to locate the lowest coal seam in the coal seam group. The high-pressure water injection pump is turned on. High-pressure water passes through the high-pressure hose 1 and the drill rod, and finally enters the punching drill bit. It is injected into the coal seam through the high-pressure water spray hole left in the punching drill bit to perform hydraulic punching. The coal seam is broken under the action of high-pressure water and flows downward into the bottom plate roadway of the coal seam group with the water flow, and as much coal as possible is flushed out. The amount of coal flushed out per meter is not less than 3 tons. During the hydraulic punching, the air volume in the bottom plate roadway of the coal seam group should be increased to not less than ^1000m3 /min.

Step three, after completing the permeability enhancement of the lower coal seam by punching, the other coal seams in the coal seam group are punched and enhanced from bottom to top.

2. The method for using the hydraulic punching and permeability enhancement device for a group of low-permeability and close-spaced coal seams underground according to claim 1 is characterized in that the drill rod is hollow.