CN204476353U - A kind of mash gas pumping drilling plugging device - Google Patents

Abstract

The utility model provides a gas drainage drilling plugging device, wherein the elastic sealing belt is close to the required sealing section of the drilling, polyurethane sealing bags are arranged at both ends of the elastic sealing belt, two polyurethane sealing bags There are multiple water-absorbing rings in the elastic sealing belt between the hole bags, the grouting pump is connected to the outer end of the grouting pipe, and a partition is arranged in the grout return control tank, and the closed space above the separator of the grout return control tank A pressure air pump is connected inside, and the closed space at the lower part of the partition is connected with the slurry return pipe. A pressure sensor is arranged in the closed space at the lower part of the partition of the slurry return control tank, and the pressure sensor is connected with the pressure air pump. The utility model adopts a polyurethane sealing bag , elastic sealing belt, and water-absorbing ring belt cooperate with each other, and the sealing structure is more reasonable. The pressure sensor and the grout control tank are used to cooperate with each other, which effectively improves the accuracy of drilling sealing and reduces the mortar curing during the sealing process. The appearance of gaps in the process further improves the sealing effect.

Description

A gas drainage drilling plugging device

technical field

The utility model relates to a plugging device, in particular to a gas drainage drilling plugging device, which belongs to the technical field of coal mine equipment and production.

Background technique

Coal seam gas drainage generally uses a gas pump to extract high-concentration gas in the coal seam, and drains the high-concentration gas to the ground through a pipe network isolated from the roadway. Coal seam gas drainage is to solve the problem of gas gushing out of the working face , An effective method to prevent and control gas overrun. The vast majority of coal seams in my country are low-permeability coal seams. Due to factors such as drilling sealing and gas leakage, the gas extraction concentration of most low-permeability coal seam mines in my country is too low, and low-concentration gas is difficult to use or the utilization cost is too high. That is to say, The current hole sealing technology is far from exerting the proper sealing and isolation effect. The drilling sealing technology is one of the key factors determining the gas drainage effect. In the existing technology, the hole is first drilled in the coal seam, and then The casing is lowered into the borehole, and the casing is fixed with slurry, and then the casing is connected to the drainage system with a hose, and the gas drainage can be carried out after the connection is completed. However, after the drilling is completed, the sealing process of running the casing, fixing the grouting, and connecting the drainage system with a hose is relatively long. The hole effect is not ideal, and it is prone to poor hole sealing and air leakage. The reason is that the setting of the plugging structure is unreasonable, and the accuracy of the slurry return setting is not high enough, which restricts the effect of drilling plugging.

In order to solve the above technical problems, the utility model provides a gas drainage drilling plugging device, which is simple in structure, easy to use and reliable. The structure that the belt and the water-absorbing ring cooperate with each other makes the sealing structure more reasonable, greatly improves the sealing effect, and effectively utilizes the advantages of the polyurethane sealing bag and the water-absorbing ring to seal the gap. In addition, the utility model adopts a pressure sensor Cooperating with the slurry return control tank, it effectively and accurately controls the return slurry pressure and the grout pressure, effectively improves the accuracy of drilling plugging, reduces the occurrence of gaps during the mortar curing process during the plugging process, and further improves the sealing effect. blocking effect.

Contents of the invention

In view of the above situation, in order to solve the defects of the prior art, the purpose of this utility model is to provide a gas drainage drilling plugging device, which includes a gas drainage pipe in the borehole, a grouting pipe, a grouting pipe, Polyurethane sealing bag, elastic sealing belt, water-absorbing ring belt and slurry control tank, characterized in that, the elastic sealing belt is close to the required sealing section of the drilling, and the two sides of the elastic sealing belt The polyurethane sealing bag is arranged at the end, and a plurality of the water-absorbing rings are arranged in the elastic sealing belt between the two polyurethane sealing bags, and a grouting pump is connected to the outer end of the grouting pipe. The outer end of the slurry return pipe is connected with a slurry return control tank, and a partition is arranged in the slurry return control tank, and a pressure air pump is connected in the closed space above the partition of the slurry return control tank. The enclosed space communicates with the slurry return pipe, and a pressure sensor is arranged in the enclosed space under the partition of the slurry return control tank, and the pressure sensor is connected to the pressure air pump.

Further, preferably, the depth of the grout return pipe extending into the borehole is greater than the depth of the grouting pipe extending into the borehole.

Further, preferably, the grout return pipe at least passes through the water-absorbing annular zone at the innermost part of the borehole, and the grouting pipe is outside the water-absorbing annular zone.

Further, preferably, the polyurethane sealing bag is 3-4m away from the outer end of the drilled hole.

Further, preferably, the inner diameter of the extraction pipe is 0.4-0.6m.

Beneficial effects of the utility model: The utility model provides a gas drainage drilling plugging device, which is simple in structure, convenient to use, and reliable. By setting a reasonable plugging structure, polyurethane hole sealing bags and elastic hole sealing belts are used. The structure of the mutual cooperation of the water-absorbing ring belt makes the sealing structure more reasonable, greatly improves the sealing effect, and effectively utilizes the advantages of the polyurethane sealing bag and the water-absorbing ring to block the gap. In addition, the utility model adopts pressure sensors and The grout return control tanks cooperate with each other to effectively and accurately control the grout return pressure and the grout pressure, effectively improve the accuracy of drilling plugging, reduce the occurrence of gaps during the plugging process, and further improve the plugging process. Effect.

Description of drawings

Fig. 1 is a structural schematic diagram of a gas drainage drilling plugging device provided by the utility model.

Among them, 1. Coal body, 2. Polyurethane sealing bag, 3. Elastic sealing belt, 4. Water absorption ring belt, 5. Grouting pipe, 6. Grouting pipe, 7. Grouting pump, 8. Grouting control Tank, 9, pressure sensor, 10, clapboard, 11, pressure air pump, 12, extraction pipe.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the utility model provides a gas drainage drilling plugging device, which includes a gas drainage pipe 12 in the borehole, a grouting pipe 5, a grouting pipe 6, a polyurethane sealing bag 2, The elastic sealing belt 3, the water-absorbing ring belt 4 and the slurry control tank 8, the elastic sealing belt 3 is close to the plugging section required for drilling, and the two ends of the elastic sealing belt 3 are provided with polyurethane sealing bags 2, two The elastic sealing belt 3 between the polyurethane sealing bags 2 is provided with a plurality of water-absorbing annular belts 4, the outer end of the grouting pipe 5 is connected with a grouting pump 7, and the outer end of the grouting pipe 6 is connected with a grouting control tank 8, A separator 10 is arranged in the pulp return control tank 8, and a pressure air pump 11 is communicated in the airtight space above the separator 10 of the slurry return control tank 8. A pressure sensor 9 is arranged in the closed space at the lower part of the dividing plate 10 of 8, and the pressure sensor 9 is connected with a pressure air pump 11.

In this embodiment, the depth of the grout return pipe 6 extending into the borehole is greater than the depth of the grouting pipe 5 extending into the borehole. The grout return pipe 6 passes through at least the innermost water absorption ring 4 in the borehole, and the grouting pipe 5 is outside the water absorption ring 4 . The polyurethane sealing bag 2 is 3-4m away from the outer end of the borehole. The inner diameter of the extraction pipe 12 is 0.4-0.6m.

When in use, firstly, construct the gas drainage borehole in the coal body 1 according to the routine, place the elastic sealing tape in the borehole, and set polyurethane sealing bags at both ends of the elastic sealing tape, after that, put the injection The grout pipe and the grout return pipe are set in the borehole, and the outer end of the grout return pipe is connected to the grout return control tank, and then the grout is injected through the grout pump until the grout back occurs, and the grout returns to the grout return control tank, just after it appears When returning grout, the air pump is turned on, and the pressure air pump in the slurry return control tank is inflated. When the pressure in the grout return pipe reaches the set pressure, the pressure air pump stops inflating until the mortar is solidified. During the curing process, the water-absorbing annular belt can expand and squeeze the elastic sealing belt during the grouting process, so that the elastic sealing belt can tightly seal and block the gas drainage borehole. mining gas.

The utility model adopts a reasonable sealing structure and adopts a structure in which the polyurethane sealing bag, the elastic sealing belt and the water-absorbing ring belt cooperate with each other, so that the sealing structure is more reasonable, the sealing effect is greatly improved, and the polyurethane sealing is effectively used. The bag and the water-absorbing ring bring the advantages of sealing the gap. In addition, the utility model uses a pressure sensor and a slurry return control tank to cooperate with each other, effectively and accurately controlling the slurry return pressure and the pressure of the slurry, and effectively improving the accuracy of drilling plugging. It reduces the occurrence of gaps during the mortar curing process during the plugging process, and further improves the plugging effect.

Claims (5)

1. a mash gas pumping drilling plugging device, it comprises the gas pumping pipe in boring, Grouting Pipe, return pipe, polyurethane hole sealing bag, elasticity sealing of hole band, water suction endless belt and overfall control tank, it is characterized in that, block section needed for described boring is close to by described elasticity sealing of hole band, the two ends of described elasticity sealing of hole band are provided with described polyurethane hole sealing bag, multiple described water suction endless belt is provided with in elasticity sealing of hole band between two described polyurethane hole sealing bags, described Grouting Pipe outer end is connected with grouting pump, described return pipe outer end is connected with overfall and controls tank, described overfall controls to be provided with dividing plate in tank, pressure air pump is communicated with in the confined space on the dividing plate top of described overfall control tank, the confined space of described the lower partition is communicated with described return pipe, pressure sensor is provided with in the confined space of the lower partition of described overfall control tank, described pressure sensor is connected with described pressure air pump.

2. a kind of mash gas pumping drilling plugging device according to claim 1, is characterized in that, the degree of depth that described return pipe stretches into described boring is greater than the degree of depth that described Grouting Pipe stretches into described boring.

3. a kind of mash gas pumping drilling plugging device according to claim 2, is characterized in that, described return pipe is at least through being in the innermost described water suction endless belt of boring, and described Grouting Pipe is in outside described water suction endless belt.

4. a kind of mash gas pumping drilling plugging device according to claim 1, is characterized in that, described polyurethane sealing of hole pocket position is 3-4m from the outer end of described boring.

5. a kind of mash gas pumping drilling plugging device according to claim 4, is characterized in that, the internal diameter of described drainage tube is 0.4-0.6m.