CN106968633A - A kind of mash gas pumping drilling hole sealing device and method for sealing - Google Patents

Abstract

A kind of mash gas pumping drilling hole sealing device and method for sealing, hole sealing device includes cloth bag (3), front chuck (2), rear chuck (4) and drainage tube (6), cloth bag (3) is made up of elastic thin-wall poromerics, and cloth bag (3) two ends are separately fixed at front chuck (2), in rear chuck (4)；Drainage tube (6) two ends are each passed through front chuck (2), rear chuck (4), front chuck (2) is fixedly connected with drainage tube (6), and rear chuck (4) is slidably connected with drainage tube (6)；Grouting Pipe socket (12) of the rear chuck (4) provided with axial direction；The gas pumping pipe of hole sealing device and operation field is quickly connected, injection sealing material in cloth bag (3), sealing material late expansion simultaneously fills up drilling surrounding crack to oozing out outside cloth bag (3), and sealing supporting is both formed to drilling, drilling surrounding crack gas leakage is prevented again.Simple to operate, economic and environment-friendly, security of the invention is good.

Description

A gas drainage drilling hole sealing device and hole sealing method

technical field

The invention relates to a hole sealing device and a hole sealing method, in particular to a coal mine gas drainage drilling hole sealing device and a hole sealing method, belonging to the technical field of coal mine gas control.

Background technique

Gas disasters seriously threaten the safe production of mines. At present, the most effective measure to prevent underground gas disasters in coal mines is gas drainage. However, more than 95% of high-gas and outburst mines in China belong to low-permeability coal seams, and their permeability coefficients are only 10 ^-3 ~ 10 ^-4 mD. The coal seams have poor permeability. In addition, the current gas drainage drilling is not strictly sealed, resulting in serious gas leakage during the drainage process, and the concentration of gas drainage in the drilling decays rapidly. Difficulty in gas drainage and low efficiency of gas drainage are common technical problems in domestic outburst mines. .

At present, the sealing technologies of my country's coal mine gas drainage drilling mainly include: cement mortar sealing, polyurethane sealing, mine sealing device sealing, etc. These technologies have been popularized and applied in a certain period of time, but there are certain deficiencies. For example, when cement mortar seals horizontal or near-horizontal holes, due to gravity, a gap is formed between the mortar sedimentation and the drilled hole, and the sealing effect is not good; the polyurethane sealing material has a fast reaction time, and it is easy to cause material waste and environmental pollution during operation. Expensive; hole sealers have limited sealing depth, etc.

Contents of the invention

In order to solve the above problems, the present invention provides a gas drainage borehole sealing device and a hole sealing method, which can effectively and permanently seal boreholes with various inclination angles. The invention makes the effective drilling time of the borehole long, and has the advantages of simple operation, economy, environmental protection and good safety.

In order to achieve the above purpose, the present invention adopts the following technical solutions: a gas drainage drilling and sealing device, including a cloth bag, a front chuck, a rear chuck and a drainage pipe, the main body of the cloth bag has a mesh number of 30-40 Made of elastic thin-walled microporous material, the front end of the cloth bag is fixed on the front chuck, and the rear end is fixed on the rear chuck; the front end of the extraction pipe passes through the front chuck, and the rear end passes through the rear chuck, and the front chuck and The extraction pipe is fixedly connected, the rear chuck is sealed and slidingly connected with the extraction pipe, and the two ends of the extraction pipe are fast pipe joint structures; the rear chuck is equipped with an axial grouting pipe socket;

Further, the extraction pipe is a special extraction short pipe with threaded joints at both ends;

Further, the front chuck and the rear chuck are made of rubber, and the front chuck is fixed on the extraction pipe through two ring-shaped protrusions arranged on the hole wall;

Further, the outer circles of the front chuck and the rear chuck are provided with annular fixing grooves, and the two ends of the cloth bag are fixed in the fixing grooves of the front chuck and the rear chuck through annular cassettes;

Further, the grouting pipe socket of the rear chuck is provided with a check valve, and the check valve is integrally formed with the rear chuck.

A gas drainage borehole sealing method, comprising the steps of:

(a) According to the data parameters of the coal seam, the construction forms the borehole;

(b) Connect the drainage device to the gas drainage pipe in the drill hole on the job site through the quick pipe joint at the front end of the drainage pipe, and connect a new section of gas drainage pipe at the rear end of the drainage device in the same way;

(c) Slide the rear chuck to the newly connected gas drainage pipe, and push all the connected gas drainage pipes into the borehole; continue to connect a new section of gas drainage pipe, and continue to Slide the chuck back; repeat the operation until the bag is straightened;

(d) After inserting the grouting pipe into the grouting pipe socket on the rear chuck, send the entire sealing device into the planned sealing section, and then connect the grouting pipe to the grouting system;

(e) Prepare the sealing material and start grouting. When the set grouting pressure is reached, separate the grouting pipe from the sealing device and the grouting equipment;

(f) Organize and clean the grouting pipes and grouting pumps for the next use.

Further, the hole-sealing material is a thick slurry formed by mixing hole-sealing powder and water at a ratio of 1:1.5 to 1:2, and the hole-sealing powder consists of 90-100 parts of Portland cement, 0.5-1 part of quicklime, 0.15-0.3 part of iron powder and oxide mixture, 0.3-0.6 part of magnesium powder, 8-15 parts of sodium silicate, Portland cement is the main component of the sealing powder, quicklime, iron Powder and oxide mixture, magnesium powder as expansion agent, sodium silicate as accelerator;

Further, after the sealing material is solidified, the expansion ratio is 1.2 to 2 times, and the compressive strength is 35MPa;

Further, the distance between the sealing section and the orifice is 8 meters to 15 meters.

Compared with prior art, the present invention has following advantage:

(1) The sealing device fixes the front chuck on the extraction pipe and slides the rear chuck to the extraction pipe, so that the cloth bag can be folded and placed on the extraction pipe, making the device a complete set by itself. It is convenient for storage and transportation; the site only needs to connect with other gas extraction pipes through quick pipe joints, and then grouting can be done without other operations.

(2) The cloth bag is made of elastic thin-walled microporous material. When the sealing material is injected into the cloth bag, it will expand and squeeze in the later stage. A certain pressure is formed in the bag cavity so that the sealing material in the cavity can penetrate outward into the rock around the drilling hole. Sealing is carried out in the cracks, so that the grouting cavity is closely combined with the surrounding rocks, which can not only form a sealed support for the borehole, but also effectively prevent air leakage around the borehole.

(3) The present invention uses an inorganic expansion material as the sealing material, which is simple to manufacture, environmentally friendly, low in price, and good in economy.

(4) The present invention can realize hole sealing without high-pressure grouting, and has good safety.

Description of drawings

Fig. 1 is a schematic diagram of the device structure of the present invention.

Fig. 2 is a schematic diagram of the structure of the front chuck.

Fig. 3 is a schematic diagram of the structure of the rear chuck.

Fig. 4 is a diagram of an embodiment of the present invention.

In the figure: 2. Front chuck, 3. Cloth bag, 4. Rear chuck, 6. Extraction pipe, 7. Ring cassette, 8. Grouting pipe, 10. Fixing groove, 11. Protruding structure, 12. Grouting Pipe socket, 13, drilling, 14, crack.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figures 1 to 4, a gas drainage drilling and sealing device includes a cloth bag 3, a front chuck 2, a rear chuck 4 and a drainage pipe 6, and the main body of the cloth bag 3 has a mesh number of 30 ~40 elastic thin-walled microporous material, both ends are made of sleeve cloth, the front end of the cloth bag 3 is fixed on the front chuck 2, and the rear end is fixed on the rear chuck 4; the front end of the extraction pipe 6 passes through the front Chuck 2, the rear end passes through the rear chuck 4, the front chuck 2 is fixedly connected with the extraction pipe 6, the rear chuck 4 is connected with the extraction pipe 6 in a sealed and sliding manner, and the two ends of the extraction pipe 6 are fast pipe joint structures; The chuck 4 is provided with an axial grouting pipe socket 12 for being connected with the grouting pipe 8 . The micropore size of the cloth bag 3 is larger than the particle size of the sealing material, and after the sealing material is injected into the cloth bag 3, the expanded sealing material will penetrate to the outside of the cloth bag 3 under the internal pressure of the cloth bag 3, thereby The fissures 14 around the borehole 13 are sealed to achieve a permanent and stable seal of the borehole 13 .

The extraction pipe 6 is a special extraction short pipe with threaded joints at both ends, and the length is 0.4 meters; the cloth bag 3 is folded on the extraction pipe 6 as a whole, and the length of the cloth bag 3 is 0.11 meters after being folded and shrunk. The length is 5-10 meters, which is convenient for fast and seamless connection with other extraction pipes on site, and convenient for transportation and storage.

The front chuck 2 and the rear chuck 4 are made of rubber, and the front chuck 2 is fixed on the extraction pipe 6 through two annular protrusion structures 11 provided on the hole wall; rubber is a highly elastic polymer with reversible deformation material, has good elasticity, and has good fixing and sealing effects, which can ensure that the extraction pipe 6 and the grouting pipe 8 can easily pass through the chuck and can also be seamlessly combined with it. After pulling out the grouting pipe 8 The slurry will not flow back.

The outer circle of the front chuck 2 and the rear chuck 4 is provided with an annular fixing groove 10, and the two ends of the cloth bag 3 are fixed in the fixing groove 10 of the front chuck 2 and the rear chuck 4 through the annular cassette 7; this structure The connection is reliable, which can prevent the bag 3 from breaking away from the front chuck 2 and the rear chuck 4 when the pressure inside the bag 3 is high.

The grouting pipe socket 12 of the rear chuck 4 is provided with a check valve (not shown in the figure), and the check valve and the rear chuck 4 are integrally formed without special connection, which can more effectively prevent the grouting from being pulled out. After pipe 8, the sealing slurry is refluxed.

A gas drainage borehole sealing method, comprising the steps of:

(a) according to the data parameter of coal seam, construction forms borehole 13;

(b) Connect the drainage device to the gas drainage pipe in the drill hole 13 on the job site through the quick pipe joint at the front end of the drainage pipe 6, and connect a new section of the gas drainage pipe at the rear end of the drainage device in the same way ;

(c) slide back the rear chuck 4 onto the newly connected gas drainage pipe, and push all the connected gas drainage pipes into the borehole 13; continue to connect a new section of the gas drainage pipe, Continue to slide the chuck 4 backwards; repeat the operation until the cloth bag 3 is straightened;

(d) After the grouting pipe 8 is inserted into the grouting pipe socket 12 on the rear chuck 4, the entire sealing device is sent into the planned sealing section, and then the grouting pipe 8 is connected to the grouting system;

(e) Prepare the sealing material and start grouting. When the set grouting pressure is reached, separate the grouting pipe 8 from the sealing device and the grouting equipment;

(f) Finish and clean the grouting pipe 8 and the grouting pump for next use.

The hole-sealing material is a thick slurry made of hole-sealing powder and water mixed at a ratio of 1:1.5 to 1:2, and the hole-sealing powder consists of 90-100 parts of Portland cement and 0.5-1 part of quicklime , 0.15-0.3 parts of iron powder and oxide mixture, 0.3-0.6 parts of magnesium powder, 8-15 parts of sodium silicate, Portland cement is the main component of the sealing powder, quicklime, iron powder and oxide The compound mixture and magnesium powder are used as expansion agent, and hydrogen gas and expandable crystal magnesium hydroxide are generated during the reaction process, which effectively compensates the volume shrinkage after hydration of cement, and makes the material have good expansibility, and consumes water during the reaction process. , to shorten the solidification time of the material; sodium silicate, as an accelerator, further shortens the solidification time of the slurry. The water loss rate of the sealing material is low, and it starts to react and expand after half an hour, and can seal the borehole (especially for horizontal and almost horizontal boreholes). The initial setting time is 2 hours, and after 24 hours of grouting Gas extraction can begin. When the holes are sealed with the hole-sealing slurry, the grouting pressure is less than 0.5 MPa, which eliminates the risk of high-pressure operation, and the process efficiency is higher than that of other hole-sealing slurry.

After the sealing material is solidified, the expansion ratio is 1.2 to 2 times, and the compressive strength is 35 MPa; it can effectively seal the gas pre-extraction drilling hole and surrounding fissures, and ensure the permanence and stability of the sealing hole.

The distance between the hole sealing section and the orifice is 8 meters to 15 meters. Applying the hole sealing device and method of the present invention to seal holes at this position can meet working conditions such as ground stress and coal seam strength.

Claims (9)

1. a kind of mash gas pumping drilling hole sealing device, it is characterised in that：Including cloth bag (3), front chuck (2), rear chuck (4) and take out Pipe (6) is adopted, described cloth bag (3) main body is made up of mesh number of 30~40 elastic thin-wall poromerics, and cloth bag (3) front end is fixed In front chuck (2), rear end is fixed in rear chuck (4)；Described drainage tube (6) front end is passed through through front chuck (2), rear end Rear chuck (4), front chuck (2) is fixedly connected with drainage tube (6), and rear chuck (4) is slidably connected with drainage tube (6) sealing, extraction Pipe (6) two ends are quick pipe connecting header structure；Grouting Pipe socket (12) of the rear chuck (4) provided with axial direction.

2. a kind of mash gas pumping drilling hole sealing device according to claim 1, it is characterized in that：Described drainage tube (6) is Two ends set the special extraction short tube of hickey.

3. a kind of mash gas pumping drilling hole sealing device according to claim 1 or 2, it is characterized in that：Described front chuck (2) It is made up with rear chuck (4) of rubber, front chuck (2) is fixed on extraction by the two circular protrusion structures (11) set on hole wall Manage on (6).

4. a kind of mash gas pumping drilling hole sealing device according to claim 3, it is characterized in that：Described front chuck (2) and Rear chuck (4) it is cylindrical be provided with annular fixing groove (10), cloth bag (3) two ends by annular snap band (7) be fixed on front chuck (2) and In the fixing groove (10) of rear chuck (4).

5. a kind of mash gas pumping drilling hole sealing device according to claim 4, it is characterized in that：Described rear chuck (4) Non-return valve is set on Grouting Pipe socket (12), and non-return valve is integrally formed with rear chuck (4).

6. a kind of mash gas pumping drilling method for sealing, it is characterised in that comprise the following steps：

(a) according to the data parameters in coal seam, construction forms drilling (13)；

(b) gas pumping that drainage device is drilled in (13) by the quick coupling of drainage tube (6) front end with operation field Pipe is connected, in the same way in the new section gas pumping pipe of rear end connection of drainage device；

(c) rear chuck (4) is slided backward to the gas pumping pipe newly accessed, by all gas pumping pipes connected to brill Promoted in hole (13)；Continue to access the new one gas pumping pipe saved, continue to slide backward chuck (4)；So operate repeatedly, until Cloth bag (3) is straightened；

(d) Grouting Pipe (8) is inserted into after the Grouting Pipe socket (12) in rear chuck (4), whole hole sealing device is sent into and planned Sealing of hole sections, then by Grouting Pipe (8) access filling system；

(e) prepare sealing material and start slip casting, when reaching the grouting pressure of setting, by Grouting Pipe (8) and hole sealing device and note Equipment is starched to depart from；

(f) Grouting Pipe (8), grouting pump are arranged and is cleaned, in case next time uses.

7. a kind of mash gas pumping drilling method for sealing according to claim 6, it is characterized in that：Described sealing material is served as reasons Sealing of hole powder and water are according to 1:1.5~1:2 thick slurrys mixed, sealing of hole powder by 90~100 parts portland cement, 0.5 ~1 part of quick lime, 0.15~0.3 part of iron powder and oxide mixture, 0.3~0.6 part of magnesium powder, 8~15 parts of silicic acid Sodium is constituted, and portland cement is the main component of sealing of hole powder, and quick lime, iron powder and oxide mixture, magnesium powder are used as expansion Agent, sodium metasilicate is used as accelerator.

8. a kind of mash gas pumping drilling method for sealing according to claim 7, it is characterized in that：Described sealing material solidification Afterwards, expansion multiple is 1.2~2 times, and compression strength is 35MPa.

9. a kind of mash gas pumping drilling method for sealing according to claim 7, it is characterized in that：Sealing of hole sections and the distance in aperture For 8 meters~15 meters.