阅读说明：本技术 一种大通径瓦斯抽采钻孔封孔装置 (Large-drift-diameter gas extraction drilling hole sealing device ) 是由 赵清全 李伟东 康建宁 汪义龙 吴教锟 石明富 陈勇 马宏宇 周文斌 孙晓虎 冯 于 2020-12-15 设计创作，主要内容包括：本发明涉及一种大通径瓦斯抽采钻孔封孔装置,属于瓦斯防治工程技术领域。包括沿钻孔设置的封孔管及注浆管,所述注浆管上设置有封孔囊袋,所述注浆管与所述封孔囊袋连通,所述封孔囊袋为两个,两个所述封孔囊袋沿所述封孔管的延伸方向依次设置,所述封孔管进入钻孔中的一端为进气端,所述进气端穿过两个所述封孔囊袋后进入钻孔中,所述注浆管上还设置有爆破阀,所述爆破阀设置在两个所述封孔囊袋之间；所述封孔管的外径≥50mm。本发明改变传统的小管径封孔方式,能够在钻孔预抽期间增大瓦斯流动通道的截面面积,大大降低瓦斯抽采系统与管网的阻力损失,减小瓦斯流动阻力,保持系统更加高效稳定运行,减少泵组与管网的无用功。(The invention relates to a large-drift-diameter gas extraction drilling and hole sealing device, and belongs to the technical field of gas control engineering. The hole sealing device comprises a hole sealing pipe and a grouting pipe which are arranged along a drill hole, wherein hole sealing bags are arranged on the grouting pipe, the grouting pipe is communicated with the hole sealing bags, the number of the hole sealing bags is two, the two hole sealing bags are sequentially arranged along the extension direction of the hole sealing pipe, one end, entering the drill hole, of the hole sealing pipe is an air inlet end, the air inlet end enters the drill hole after penetrating through the two hole sealing bags, and an explosion valve is further arranged on the grouting pipe and arranged between the two hole sealing bags; the outer diameter of the hole sealing pipe is more than or equal to 50 mm. The invention changes the traditional small-caliber hole sealing mode, can increase the section area of a gas flow channel during the pre-pumping period of a drill hole, greatly reduces the resistance loss of a gas extraction system and a pipe network, reduces the gas flow resistance, keeps the system to run more efficiently and stably, and reduces the useless work of a pump set and the pipe network.)

1. The utility model provides a big latus rectum gas drainage drilling hole sealing device which characterized in that: the hole sealing device comprises a hole sealing pipe and a grouting pipe which are arranged along a drill hole, wherein hole sealing bags are arranged on the grouting pipe, the grouting pipe is communicated with the hole sealing bags, the number of the hole sealing bags is two, the two hole sealing bags are sequentially arranged along the extension direction of the hole sealing pipe, one end, entering the drill hole, of the hole sealing pipe is an air inlet end, the air inlet end enters the drill hole after penetrating through the two hole sealing bags, and an explosion valve is further arranged on the grouting pipe and arranged between the two hole sealing bags; the outer diameter of the hole sealing pipe is more than or equal to 50 mm.

2. The large-drift-diameter gas extraction drilling and hole sealing device according to claim 1, characterized in that: a one-way valve is arranged between the grouting pipe and the hole sealing bag, the grouting pipe is communicated with the hole sealing bag through the one-way valve, and the grouting pipe performs grouting into the hole sealing bag through the one-way valve.

3. The large-drift-diameter gas extraction drilling and hole sealing device according to claim 1, characterized in that: the external diameter of hole sealing pipe is 63mm, the wall thickness of hole sealing pipe is 7mm, the internal diameter specification of hole sealing pipe is 49 mm.

4. The large-drift-diameter gas extraction drilling and hole sealing device according to claim 1, characterized in that: the external diameter of hole sealing pipe is 75mm, the wall thickness of hole sealing pipe is 8.30mm, the internal diameter of hole sealing pipe is 58.40 mm.

5. The large-drift-diameter gas extraction drilling and hole sealing device according to claim 1, characterized in that: the hole sealing pipe and the grouting pipe are continuous pipes.

6. The large-drift-diameter gas extraction drilling and hole sealing device according to claim 1, characterized in that: the outer diameter and the inner diameter of the grouting pipe are respectively 16mm and 12 mm.

7. The large-drift-diameter gas extraction drilling and hole sealing device according to claim 1, characterized in that: the length of the hole sealing bag is 1000 mm.

Technical Field

The invention belongs to the technical field of gas prevention and control engineering, and relates to a large-drift-diameter gas extraction drilling and hole sealing device.

Background

With the rapid development of the gas extraction large-diameter drill hole drilling technology and equipment, the technical advantage of the large-diameter drill hole in the gas extraction effect is further verified, and the large-diameter gas extraction drill hole is promoted to gradually become the development trend of gas extraction. At present, a two-plugging one-injecting hole sealing process is widely adopted for sealing a gas extraction drill hole, and a drill hole, a crack ring around the drill hole and a coal body crack channel are tightly plugged by slurry to ensure the sealed extraction of the drill hole.

The pore diameter of the drilled hole is increased, the pressure relief range of the coal body around the drilled hole and the fracture channel are further developed, the gas desorption speed is high, the gas desorption amount is large, and a large amount of adsorbed gas is desorbed and moves towards the direction of the drilled hole under the effects of pore-forming pressure relief effect and pressure gradient. The traditional small-caliber hole sealing pipe has certain limitation on a gas extraction flow channel in unit time under similar extraction conditions; on the other hand, the small-caliber hole sealing pipe generally has large pipeline friction resistance, and the resistance superposition effect seriously influences the resistance loss of an extraction system and a pipe network in consideration of the scale and the coverage range of the gas extraction drilling engineering quantity. How to efficiently realize the large-drift-diameter, large-flow and low-resistance gas extraction of the gas extraction drilled hole is the key for further combining the high-efficiency extraction of the gas of the large-diameter drilled hole.

At present, a known gas extraction drilling and hole sealing device (CN111852391A) with adaptive deformation comprises a hole sealing unit and a hole sealing pipe, wherein one end of the hole sealing pipe arranged in a drill hole is an air inlet end, the hole sealing pipe is divided into two times, the air inlet ends of the two times of hole sealing pipes are all arranged by penetrating through the hole sealing unit, so that adaptive drilling deformation of the hole sealing pipe can be realized, a traditional PVC straight pipe splicing or screw thread connection mode is not required, and the splicing or screw thread connection disjointing between pipes caused by drilling deviation and deformation is avoided; the grouting pressure bearing capacity of the hole sealing pipe is further improved, the hole sealing pipe is prevented from being flattened under grouting pressure, slurry flows into the hole sealing pipe, the sealing performance of a grouting air chamber between hole sealing bags is guaranteed, and grouting pressure is improved to ensure that the slurry can effectively penetrate into coal cracks around the hole.

The known gas extraction drill hole leakage detection and progressive secondary hole sealing device and the using method (CN111852392A) comprise two hole sealing units and a hole sealing pipe, wherein the two hole sealing units are sequentially arranged along the extending direction of a drill hole; one end of the hole sealing pipe arranged in the drill hole is a gas inlet end, the hole sealing pipe is divided into two steps, the gas inlet end of the hole sealing pipe in one step is arranged between the two hole sealing units, and the gas inlet end of the hole sealing pipe in the other step is arranged to penetrate through the two hole sealing units; the method comprises leak detection monitoring and secondary hole sealing. The progressive secondary hole sealing can be performed during the continuous extraction of the drill hole, the continuous sealed extraction of the drill hole is kept, and the extraction efficiency and the life cycle of the drill hole are continued; the self-adaptive deformation of the drill hole can be realized when the track of the drill hole deviates, so that the hole sealing pipe is prevented from being flattened under the grouting pressure, and hole sealing slurry enters the hole sealing pipe, and the pumping and extraction are ensured to be stable and reliable; the requirements of gas extraction flow channels in different extraction periods under the extraction attenuation aging characteristic are met.

In summary, at present, a great deal of research is conducted on two-hole-one-injection and hole-sealing, hole-sealing leakage detection identification and secondary hole sealing in a gas extraction drill hole, but there are few reports on a large-diameter hole sealing device applicable to a large-diameter gas extraction drill hole

Disclosure of Invention

In view of the above, the present invention aims to provide a large-bore gas extraction borehole sealing device, which can increase the cross-sectional area of a gas flow channel and reduce the gas flow resistance during the pre-extraction of a borehole.

In order to achieve the purpose, the invention provides the following technical scheme: the hole sealing device comprises a hole sealing pipe and a grouting pipe which are arranged along a drill hole, wherein hole sealing bags are arranged on the grouting pipe, the grouting pipe is communicated with the hole sealing bags, the number of the hole sealing bags is two, the two hole sealing bags are sequentially arranged along the extension direction of the hole sealing pipe, one end, entering the drill hole, of the hole sealing pipe is an air inlet end, the air inlet end enters the drill hole after penetrating through the two hole sealing bags, and the grouting pipe is further provided with an explosion valve which is arranged between the two hole sealing bags; the outer diameter of the hole sealing pipe is more than or equal to 50 mm.

Optionally, a one-way valve is arranged between the grouting pipe and the hole sealing bag, the grouting pipe is communicated with the hole sealing bag through the one-way valve, and the grouting pipe performs grouting into the hole sealing bag through the one-way valve.

Optionally, the outer diameter of the hole sealing pipe is 63mm, the wall thickness of the hole sealing pipe is 7mm, and the inner diameter of the hole sealing pipe is 49 mm.

Optionally, the outer diameter of the hole sealing pipe is 75mm, the wall thickness of the hole sealing pipe is 8.30mm, and the inner diameter of the hole sealing pipe is 58.40 mm.

Optionally, the hole sealing pipe and the grouting pipe are continuous pipes.

Optionally, the outer diameter and the inner diameter of the grouting pipe are 16mm and 12mm respectively.

Optionally, the length of the sealing pocket is 1000 mm.

The invention has the beneficial effects that: (1) the traditional hole sealing pipe with the outer diameter of 50mm is converted into the hole sealing pipe with the outer diameter of 63/75mm, so that the cross section area of a gas extraction flow channel of the hole sealing pipe is increased, and the gas extraction flow rate in unit time under the same condition is increased. According to theoretical calculation, when the hole sealing pipe is increased from 50mm to 63mm, the inner diameter of the drilled hole is increased from 38.80mm to 49mm, increased by 10.20mm and increased by 1.27 times according to the calculation of the nominal pressure of 2 MPa; cross section surfaceProduct is 0.001182m²Increased to 0.001885m²Increase by 0.000703m²Increased by a factor of 1.59. When the hole sealing pipe is increased from 50mm to 75mm, the inner diameter of the drilled hole is increased from 38.80mm to 58.40mm, increased by 19.60mm and increased by 1.51 times according to the calculation of the nominal pressure of 2 MPa; cross-sectional area is 0.001182m²Increased to 0.002677m²Increase by 0.001495m²Increased by a factor of 2.27. (2) According to the basic equation of the frictional resistance of the pipeline, the relationship between the flow velocity of gas in the pipeline and the mixed flow and the inner diameter of the pipeline, the calculation equation of the frictional resistance of the pipeline can be obtained:

h, pipeline friction resistance loss, Pa;

lambda is the coefficient of friction resistance of the pipeline, and has no dimension;

l is the length of the pipeline, m;

v is the gas flow velocity in the pipeline, m/s;

d is the inner diameter of the pipeline, m;

rho-gas density in the pipeline, kg/m³。

Q-gas mixture flow in the pipe, m³/s。

According to the equation, the frictional resistance of the pipeline is in inverse proportion to the 5 th power of the inner diameter of the pipeline, and when the inner diameter of the hole sealing pipe is increased, the frictional resistance of the pipeline is greatly reduced. In combination with the practical engineering, the number of mine gas extraction drill holes is often based on thousands, the reduction of the friction resistance of the drill hole sealing pipeline can greatly reduce the resistance loss of a gas extraction system and a pipe network, keep the system to run more efficiently and stably, and reduce the useless work of a pump group and the pipe network.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of a large-drift-diameter gas extraction drilling and hole sealing device;

FIG. 2 is a cross-sectional view of a borehole before sealing;

FIG. 3 is a cross-sectional view of a drilled hole after sealing.

Reference numerals: the drilling machine comprises a drilling hole 1, a hole sealing pipe 2, a grouting pipe 3, a hole sealing bag 4, an explosion valve 5 and a one-way valve 6.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Example 1

Referring to fig. 1 to 3, the large-drift-diameter gas extraction drilling and sealing device includes a hole sealing pipe 2 and a grouting pipe 3 arranged along a drill hole, wherein the hole sealing pipe 2 and the grouting pipe 3 are both continuous pipes, and the outer diameter of the hole sealing pipe 2 is greater than or equal to 50 mm. The grouting pipe 3 is provided with a hole sealing bag 4 and a blasting valve 5. Hole sealing bag 4 is 2, and 2 hole sealing bag 4 set gradually along the extending direction of hole sealing pipe 2, and blast valve 5 sets up between 2 hole sealing bag 4. One end of the hole sealing pipe 2 entering the drill hole 1 is an air inlet end, and the air inlet end penetrates through the two hole sealing bags 4 and then enters the drill hole. The position of the grouting pipe 3 corresponding to the hole sealing bag 4 is provided with a one-way valve 6, the grouting pipe 3 is communicated with the hole sealing bag 4 through the one-way valve 6, and the grouting pipe 3 performs grouting into the hole sealing bag 4 through the one-way valve 6.

In the embodiment, the hole sealing bag 4 is a flame-retardant antistatic filtering bag with the length of 1000mm, and free water in grouting slurry is efficiently filtered. The hole sealing pipe 2 is made of a flame-retardant and antistatic PVC pipe, the nominal pressure is 2MPa, the outer diameter of the hole sealing pipe 2 is 75mm, the wall thickness of the hole sealing pipe 2 is 8.30mm, and the inner diameter of the hole sealing pipe 2 is 58.40 mm. The grouting pipe 3 is a flame-retardant antistatic PE pipe formed by one-time thermoplastic coiling, the outer diameter of the grouting pipe 3 is 16mm, the inner diameter is 12mm, and the wall thickness is 2 mm.

During practical use, the hole sealing device is placed in a drill hole 1, grouting is conducted into the hole sealing bag bags 4 through the grouting pipe 3, the drill hole 1 is sealed after the hole sealing bag bags 4 are grouted, grouting is conducted into the grouting pipe 3 continuously, after the pressure in the grouting pipe 3 reaches the set value of the explosion valve 5, the explosion valve 5 is opened, and grout in the grouting pipe 3 enters the drill hole 1 between the two hole sealing bag bags 4 through the explosion valve 5. The one-way valve 6 on the sealing bag 4 can prevent the slurry from overflowing from the sealing bag 4 and keep the sealing bag 4 in an expanded state. And after the slurry in the hole sealing bag 4 and between the hole sealing bags 4 is solidified, the drilling hole 1 is sealed.

Example 2

In this embodiment, the outer diameter of the hole sealing pipe 2 is 63mm, the wall thickness of the hole sealing pipe 2 is 7mm, and the inner diameter of the hole sealing pipe 2 is 49 mm.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.