CN103790546A - Gas pre-pumping drilled hole coal dust backfill sealing method - Google Patents

Abstract

The invention discloses a method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling holes. Firstly, while drilling a coal seam with a drilling tool, coal powder is collected and filtered or pulverized to keep the particle size of the coal powder not greater than 1mm; The filtered fine coal powder is input into the mixer, and cement and white latex are added to stir to make a fine coal mixture. The weight percentage of each component of the fine coal mixture is: fine coal powder 60-70%, cement 25-35% , white latex 4-6%; then add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3-0.5. The invention uses fine coal slurry instead of cement slurry to seal holes, and the coal slurry is closely combined with the coal body without shrinkage and does not pollute the coal body. As the sealing material, fine coal powder can be obtained locally, which reduces the mining cost and is easy to prepare. After many tests, it has been confirmed that the sealing effect is very good. Moreover, after mining the coal seam, there will not be too much debris such as cement, sand and stone, and the mining purity is high, and the mining efficiency is high, which is very suitable for promotion and implementation.

Description

Method of backfilling and sealing holes with coal cuttings in gas pre-drainage drilling holes

technical field

The invention relates to a hole sealing technology in the technical field of coal mines, in particular to a method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling holes.

Background technique

With the rapid development of the coal industry and the mechanization of coal mine production, the problem of dust damage in coal mine production is still severe. The incidence of pneumoconiosis among coal miners is relatively high, and coal dust explosions occur from time to time. Gas outburst is a serious natural disaster in coal mines. Seriously restrict the safe production of coal mines. The standard coal mining process needs to drain the gas from the coal seam first. Since the coal seam is buried deep underground and the pressure between the coal seams is high, it is necessary to insert a gas drainage pipe after the coal seam is drilled to extract the gas deep in the coal seam. The gas drainage process needs to seal the drainage pipe. The traditional and simple method is to directly seal the hole with cement mortar, insert the gas drainage pipe into the bottom of the hole sealing section of the drilled hole, block it with wooden wedges or cotton yarn, and then seal the hole with cement. After the cement slurry is solidified, it can be pumped. It takes a long time to seal the hole with cement mortar and inject water, the sealing effect is not good, the ability to withstand air pressure is not strong, and it consumes a lot of materials and is inconvenient to operate.

In addition, the existing joints between the cement slurry and the coal body are tight, and the cement slurry shrinks slightly after solidification, the sealing effect is poor, and the coal body will be polluted, resulting in an increase in the ash content of the coal.

Contents of the invention

The object of the present invention is to provide a multi-section bladder sealer that can effectively prevent spray holes in view of the problems and deficiencies in the prior art.

In order to achieve the above purpose, the following technical scheme is adopted: a method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling, (1) while drilling the coal seam with drilling tools, the coal powder is collected and filtered or pulverized to keep the coal The powder particle size is not more than 1mm; (2) Input the filtered fine coal powder into the mixer and add cement and white latex to stir to make a fine coal mixture. The weight percentage of each component of the fine coal mixture is: fine coal Powder 60-70%, cement 25-35%, white latex 4-6%; (3) Add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3-0.5; (4) Use a grouting pump to mix fine coal The coal slurry is transported and pressed into the grouting port of the grouting and sealing device. The grouting and sealing device includes a gas drainage pipe, front and rear pockets and a grouting pipe. The front and back bladders are connected with grouting pipes through each bladder, and the grouting tubes communicate with the inner cavity of the bladders through branch pipes, and a one-way valve is installed on the branch pipes; the grouting pipe between two adjacent bladders A burst valve is provided on the wall of the slurry pipe. The weight percentage of each component of the fine coal mixture is preferably: fine coal powder 65-70%, cement 27-30%, white latex 5-6%, more preferably: fine coal powder 68%, cement 27%, white latex 5% . The ratio of water to fine coal mixture is 0.4. At least one constraining loop is arranged on the outside of each pouch. The innermost end of the gas drainage pipe is provided with a gas-gathering section, and strip-shaped or circular ventilation holes are distributed on the gas-gathering section.

Fine coal powder or cement is fed into the mixer by a quantitative feeding device. The quantitative feeding device includes a horizontal cylindrical silo and a rotating drum installed horizontally in the cylindrical silo. The upper and the lower are respectively provided with a material inlet and a material outlet, and blades are arranged on the side wall of the drum, and the outer contour of each blade matches the inner wall of the cylindrical silo. Since the gap between the blades is a quantitative gap, a specific material can be released each time by setting different types of quantitative feeding devices.

The quantitative feeding device is manually driven to rotate the rotating shaft; or the rotating shaft of the drum is connected to the power mechanism through transmission. The output shaft of the power mechanism is connected with the rotating shaft of the drum, and a control mechanism for changing the speed of the power mechanism is provided.

Another method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling: (1) While drilling the coal seam with drilling tools, collect and filter or pulverize and filter the coal powder to keep the particle size of the coal powder not greater than 1mm; (2 ) Input the filtered fine coal powder into the agitator and add cement and white latex to stir to make a fine coal mixture. The weight percentage of each component of the fine coal mixture is: fine coal powder 80-92%, white latex 8 ~20%, stirring to make fine coal mixture; (3) add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3~0.5; stir to make fine coal slurry; (4) use grouting pump to mix fine coal The coal slurry is transported and pressed into the grouting port of the grouting and sealing device. The grouting and sealing device includes a gas drainage pipe, front and rear pockets and a grouting pipe. The front and back bladders are connected with grouting pipes through each bladder, and the grouting tubes communicate with the inner cavity of the bladders through branch pipes, and a one-way valve is installed on the branch pipes; the grouting pipe between two adjacent bladders A burst valve is provided on the wall of the slurry pipe. The weight percentage of each component of the fine coal mixture is preferably: fine coal powder 90%, white latex 10%.

Beneficial effects: the invention uses fine coal powder as the hole sealing material, which can be obtained locally, reduces the mining cost, is simple and convenient to prepare, and has been confirmed to have a very good sealing effect after many tests. The invention uses fine coal slurry instead of cement slurry to seal holes, and the coal slurry is closely combined with the coal body without shrinkage and does not pollute the coal body. Moreover, after mining the coal seam, there will not be too much debris such as cement, sand and gravel, and the mining purity is high, and the mining efficiency is high, which is very suitable for promotion and implementation.

Description of drawings

Fig. 1 is one of flow diagrams of sealing method of the present invention;

Fig. 2 is the second schematic flow chart of the sealing method of the present invention;

Fig. 3 is a schematic diagram of the appearance structure of the grouting sealing device in the present invention;

Fig. 4 is a schematic cross-sectional structure diagram of Fig. 3;

Fig. 5 is a structural schematic diagram of the quantitative feeding device in the present invention.

In the figure, the number 1 is the gas drainage pipe, 2 is the bag, 3 is the restraining collar, 4 is the grouting pipe, 5 is the blasting valve, 6 is the gas collection section, 7 is the one-way valve, 8 is the agitator, 9 10 is a valve, 11 is a horizontal cylindrical silo, 12 is a feeding inlet, 13 is a feeding outlet, 14 is a rotating drum, 15 is a drive shaft, and 16 is a blade.

Detailed ways

Embodiment 1: A method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling holes, referring to Fig. 1, while utilizing the drilling tool to drill the coal seam, coal dust is collected and filtered or crushed and filtered to keep the coal dust particle size constant greater than 1mm; then, input the filtered fine coal powder into the mixer and add cement and white latex to stir to make a fine coal mixture.

The raw materials for making the fine coal powder mixture can use a quantitative feeding device or a quantitative liquid feeding device. The quantitative liquid feeding device can be controlled by a valve, and the quantitative feeding device can adopt the structure as shown in FIG. 5 . In Fig. 5, the quantitative feeding device includes a recumbent cylindrical silo 11 and a revolving drum 14 installed in the cylindrical silo, and the top and bottom of the cylindrical silo 11 are respectively provided with feeding ports 12. Blades 16 are arranged on the side walls of the drum 14 and the outlet 13 , and the outer contour of each blade 16 matches the inner wall of the cylindrical silo 11 . Since the gap between the blades is a quantitative gap, a specific material can be released each time by setting different types of quantitative feeding devices.

The quantitative feeding device can be manually driven to rotate the rotating shaft 15; it can also be turned into a controllable quantitative feeding device, that is, the rotating shaft 15 of the drum 14 is connected to the power mechanism through transmission. The output shaft of the power mechanism is connected with the rotating shaft 15 of the drum, and a control mechanism for changing the speed of the power mechanism is provided.

The weight percentage composition of each composition of fine coal mixture: add following weight percentage composition in the stirrer 8 among Fig. 3: fine coal powder 60～70%, cement 25～35%, white latex 4～6%, stir to make Fine coal mixture; add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3-0.5.

As shown in Figure 3 and Figure 4, the fine coal slurry is transported and pressed into the grouting port of the grouting sealing device by a grouting pump. Front and rear bladders 2 are sequentially fixed on the tube body of the gas drainage pipe 1, and the distance between the bladders 2 at both ends of the gas drainage pipe 1 is 3m~15m. A grouting pipe 4 is connected through each bladder 2, and the grouting tube 4 communicates with the inner cavity of the bladder 2 through a branch pipe, and a one-way valve 7 is installed on the branch pipe, and the end of the grouting pipe 4 is fixed and sealed behind the In the bladder 2 on the side; a blast valve 5 is arranged on the wall of the grouting pipe between two adjacent bladders 2; The blasting valve 5 on the wall of the grouting pipe between two adjacent bladders 2 bursts immediately when the grouting pressure increases to 0.5 MPa. The space is pressurized and sealed. In addition, the innermost end of the gas drainage pipe 4 is provided with a gas collection section 6 , and strip-shaped or circular ventilation holes are distributed on the gas collection section 6 .

Embodiment 2: The content is basically the same as in Example 1, and the similarities are not repeated. The difference is: the weight percentages of the components of the fine coal mixture: fine coal powder 65～70%, cement 27～30%, white latex 5～ 6%. Then add water and continue stirring, so that the ratio of water to fine coal mixture is 0.4-0.5.

Embodiment 3: content is basically the same as embodiment 2, and similarity is not repeated, and difference is: fine coal powder 68%, cement 27%, white latex 5%. Add water again and continue to stir so that the ratio of water to fine coal mixture is 0.4.

Embodiment 4: Another method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling holes, refer to Fig. 2, while using the drilling tool to drill the coal seam, the coal powder is collected and filtered or pulverized to keep the coal powder particle size No more than 1mm; then, input the filtered fine coal powder into the mixer and add cement and white latex to stir to make fine coal mixture.

The raw materials for making the fine coal powder mixture can use a quantitative feeding device or a quantitative liquid feeding device. The quantitative liquid feeding device can be controlled by a valve, and the quantitative feeding device can adopt the structure as shown in FIG. 5 . In Fig. 5, the quantitative feeding device includes a recumbent cylindrical silo 11 and a revolving drum 14 installed in the cylindrical silo, and the top and bottom of the cylindrical silo 11 are respectively provided with feeding ports 12. Blades 16 are arranged on the side walls of the drum 14 and the outlet 13 , and the outer contour of each blade 16 matches the inner wall of the cylindrical silo 11 . Since the gap between the blades is a quantitative gap, a specific material can be released each time by setting different types of quantitative feeding devices.

The quantitative feeding device can be manually driven to rotate the rotating shaft 15; it can also be turned into a controllable quantitative feeding device, that is, the rotating shaft 15 of the drum 14 is connected to the power mechanism through transmission. The output shaft of the power mechanism is connected with the rotating shaft 15 of the drum, and a control mechanism for changing the speed of the power mechanism is provided.

The weight percentage composition of each composition of fine coal mixture: add following weight percent composition in the agitator 8 among Fig. 3: fine coal powder 80～92%, white latex 8～20%, stir and make fine coal mixture; Add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3-0.5.

As shown in Figure 3 and Figure 4, the fine coal slurry is transported and pressed into the grouting port of the grouting sealing device by a grouting pump. Front and rear bladders 2 are sequentially fixed on the tube body of the gas drainage pipe 1, and the distance between the bladders 2 at both ends of the gas drainage pipe 1 is 3m~15m. A grouting pipe 4 is connected through each bladder 2, and the grouting tube 4 communicates with the inner cavity of the bladder 2 through a branch pipe, and a one-way valve 7 is installed on the branch pipe, and the end of the grouting pipe 4 is fixed and sealed behind the In the bladder 2 on the side; a blast valve 5 is arranged on the wall of the grouting pipe between two adjacent bladders 2; The blasting valve 5 on the wall of the grouting pipe between two adjacent bladders 2 bursts immediately when the grouting pressure increases to 0.5 MPa. The space is pressurized and sealed. In addition, the innermost end of the gas drainage pipe 4 is provided with a gas collection section 6 , and strip-shaped or circular ventilation holes are distributed on the gas collection section 6 .

The grouting pump is used to transport and press the fine coal slurry into the grouting port of the grouting and sealing device. The grouting and sealing device includes a gas drainage pipe, front and rear pockets and a grouting pipe. The front and rear bladders are respectively fixed on the front and rear of the tube body, and a grouting pipe is connected through each bladder, and the grouting tube communicates with the inner cavity of the bladder through a branch pipe, and a one-way valve is installed on the branch pipe; A burst valve is arranged on the wall of the grouting pipe between the bladders.

Embodiment 5: The content is basically the same as that of Example 4, and the similarities will not be repeated. The difference is that the weight percentages of each component of the fine coal mixture are preferably: fine coal powder 90%, white latex 10%. Add water again and continue to stir so that the ratio of water to fine coal mixture is 0.4.

Claims (10)

1. A method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling, which is characterized in that: (1) While drilling the coal seam with a drilling tool, the pulverized coal is collected and filtered or pulverized to keep the pulverized coal particle size constant. (2) Input the filtered fine coal powder into the mixer and add cement and white latex to stir to make a fine coal mixture. The weight percentage of each component of the fine coal mixture is: fine coal powder 60-70 %, 25% to 35% cement, 4% to 6% white latex; (3) add water and continue to stir, so that the ratio of water to fine coal mixture is 0.3 to 0.5; (4) use the grouting pump to transport the fine coal slurry into the grouting port of the grouting and sealing device, the grouting and sealing device includes a gas drainage pipe, front and rear pockets and a grouting pipe, the front and rear pockets are respectively fixed on the front and rear of the body of the gas drainage pipe, A grouting pipe is connected through each bladder, and the grouting tube communicates with the inner cavity of the bladder through a branch pipe, and a one-way valve is installed on the branch pipe; on the wall of the grouting pipe between two adjacent bladders A burst valve is provided. 2. The method for backfilling and sealing holes with coal chips for gas pre-extraction drilling according to claim 1, characterized in that: the weight percentages of the components of the fine coal mixture are: fine coal powder 65-70%, cement 27-30% , White latex 5-6%. 3. The method for backfilling and sealing holes with coal chips for gas pre-extraction drilling according to claim 2, characterized in that: fine coal powder 68%, cement 27%, white latex 5%; the ratio of water to fine coal mixture is 0.4. 4. The method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling holes according to claim 1, characterized in that: at least one constraining collar is arranged on the outside of each bag. 5. The method for backfilling and sealing holes with coal cuttings in gas pre-drainage drilling holes according to claim 1, characterized in that: the innermost end of the gas drainage pipe is provided with a gas-gathering section, and strip-shaped gas-gathering sections are distributed on the gas-gathering section. or circular air holes. 6. The method for backfilling and sealing holes with gas pre-extraction drilling coal cuttings according to claim 1, characterized in that: the fine coal powder or cement is input into the agitator using a quantitative feeding device, and the quantitative feeding device includes a horizontal A cylindrical silo and a rotary drum installed horizontally in the cylindrical silo. The upper and lower sides of the cylindrical silo are respectively provided with a feed inlet and a discharge port, and the side walls of the drum are provided with blades. The outer contour of the blade matches the inner wall of the cylindrical silo. 7. The method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling according to claim 6, characterized in that: the quantitative feeding device is manually driven to rotate the rotating shaft; or the rotating shaft of the rotating drum is connected to the power mechanism through transmission. 8. The method for backfilling and sealing holes with gas pre-extraction drilling coal chips according to claim 6 or 7, characterized in that: the output shaft of the power mechanism is connected to the rotating shaft of the drum, and a control mechanism for changing the speed of the power mechanism is provided. 9. A method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling, which is characterized in that: (1) While drilling the coal seam with a drilling tool, the coal powder is collected and filtered or pulverized to keep the coal powder particle size constant. (2) Input the filtered fine coal powder into the mixer and add cement and white latex to stir to make a fine coal mixture. The weight percentage of each component of the fine coal mixture is: fine coal powder 80-92 %, white latex 8-20%, stir to make fine coal mixture; (3) add water and continue stirring, so that the ratio of water to fine coal mixture is 0.3-0.5; stir to make fine coal slurry; (4) use The grouting pump transports and presses the fine coal slurry into the grouting port of the grouting and sealing device. The grouting and sealing device includes gas drainage pipes, front and rear pockets and grouting pipes. The front and rear bladders are respectively fixed on the front and rear of the body, and a grouting pipe is connected through each bladder, and the grouting tube communicates with the inner cavity of the bladder through a branch pipe, and a one-way valve is installed on the branch pipe; A burst valve is provided on the wall of the grouting pipe between the bags. 10. The method for backfilling and sealing holes with coal chips for gas pre-extraction drilling according to claim 9, characterized in that: the weight percentage of each component of the fine coal mixture is preferably: fine coal powder 90%, white latex 10%.

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