CN209261534U - A combined coal seam water injection and gas drainage sealing device - Google Patents

Abstract

A combined coal seam water injection and gas drainage sealing device, including a first bladder, a second bladder, a sleeve, a grouting pipe, and an inner water injection plugging device; the first bladder and the second bladder are viewed from left The right interval is set in the borehole, the second pocket is located at the hole opening, the casing passes through the second pocket and the first pocket along the axial direction of the borehole, and the grouting pipe is parallel to the casing The direction passes through the second bladder and then extends into the first bladder, the left end of the grouting pipe is blocked, the first check valve, the pressure control valve and the second check valve are set on the grouting tube, and the inner water is blocked The device is set in the casing. The utility model can make the outer circle of the expansion bag closely adhere to the inner wall of the casing to realize effective sealing of coal seam drilling; the expansion bag and the water injection pipe can be reused, thereby reducing the cost of sealing holes. It has the characteristics of simple operation process, good functional effect, high safety performance and remarkable economic benefit.

Description

A combined coal seam water injection and gas drainage sealing device

technical field

The utility model belongs to the technical field of coal seam water injection and gas drainage, in particular to a combined coal seam water injection and gas drainage sealing device.

Background technique

Coal will account for 50% to 70% of my country's primary energy for a long time, of which more than 90% is underground mining. With the high-intensity development of coal resources, many coal mines have entered the stage of deep mining, and various disasters brought about by the mining of coal resources are becoming more and more serious. When the water injection pressure in the coal seam is low, it can be used to prevent dust. When the pressure is high, water injection fracturing can be implemented to increase the permeability of the coal seam and then perform gas drainage to solve the problem of mine gas disasters. The implementation of the above measures depends on the sealing of the borehole. hole. Therefore, an effective drilling and sealing device is of great significance for solving disasters such as mine dust and gas.

In the past, cement-based materials and steel pipes were mainly used to seal holes in coal seam water injection fracturing holes. This method is simple in principle and can meet high-pressure hole sealing, but its operation process is relatively complicated, and it consumes More materials and manpower, especially after water injection, a large number of iron pipes remain in the coal seam, leaving safety hazards in the mining process; in recent years, hole sealing technology has also been widely used. The reason is that the inner wall of the coal seam borehole is generally relatively rough, and the seal between the hole sealer and the coal wall is often not tight, and water and gas leakage occur during the water injection process or the gas extraction process, which affects the implementation of the mine disaster control project.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a combined coal seam water injection and gas drainage sealing device which is easy to operate, tightly sealed, diverse in function and strong in safety and reliability.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a combined coal seam water injection and gas extraction sealing device, including the first bladder, the second bladder, casing, grouting pipe and inner water injection plugging device;

Taking the axial direction of the borehole from the bottom of the hole to the orifice as the direction from left to right, the first pouch and the second pouch are arranged in the borehole at intervals from left to right, and the second pouch is located in the hole of the borehole At the mouth, the sleeve passes through the second bladder and the first bladder along the axial direction of the borehole, and the grouting tube passes through the second bladder in a direction parallel to the sleeve and then extends into the first bladder. The left end of the grouting pipe is blocked, and the grouting pipe is provided with a first one-way valve, a pressure control valve and a second one-way valve. The first one-way valve is located in the first bladder, and the pressure control valve is located between the first bladder and the first bladder. In the annular cavity between the second bladders, the second one-way valve is located in the second bladders, and the inner water injection occluder is arranged in the casing.

The left end of the casing is provided with a screen tube located on the left side of the first pouch.

The grouting pipe is provided with a first pressure gauge and a first valve on the right side of the second bladder.

The inner water injection occluder includes an expansion bladder, a water injection pipe and a plugging water pipe. The expansion bladder is set in the casing, the water injection pipe extends coaxially into the casing and passes through the expansion bladder, and the left end of the plugging water pipe extends into the casing. The pipe is connected with the expansion bag, and the plugged water pipe is provided with a second pressure gauge and a second valve on the right side of the bore hole.

Adopting the above-mentioned technical scheme, when the utility model is in use, the utility model is first sent into the borehole of the coal seam, and then the first bladder, the second bladder and the first bladder and the second bladder are injected through the grouting pipe. Grouting in the annular cavity between the bags, the slurry is injected into the first bladder through the first one-way valve, and injected into the second bladder through the second one-way valve, and the pressure of the slurry in the first bladder and the second bladder is When the opening pressure of the pressure control valve is reached, the pressure control valve is opened, and the slurry is injected into the annular cavity through the pressure control valve. When the first pressure gauge shows that the pressure in the grouting pipe reaches the predetermined pressure, the first valve is closed, so that The gap between the coal seam and the outer circle of the casing can be completely blocked by three-stage grouting; then water is injected into the expansion bladder through the plugging water pipe, and the expansion bladder expands after filling water, and the outer circle of the expansion bladder and the inner wall of the casing Sealing fit, when the second pressure gauge shows that the pressure in the blocked water pipe reaches the predetermined pressure, the second valve can be closed, so that the borehole can be completely blocked; finally, water is injected into the borehole through the water injection pipe, and drained through the screen pipe. Into the borehole, water injection and dust prevention are performed during low-pressure water injection in the water injection pipe, and water injection and fracturing are performed to increase the permeability of the coal seam when the water injection is completed. Take it out from the casing for recycling and reuse; finally connect the right end of the casing to the gas drainage system for gas drainage.

In summary, the beneficial effects of the utility model are: the front end of the casing is a screen tube, which can prevent the coal in the borehole from entering the drainage pipe and blocking the drainage pipeline; The grouting at both ends is controlled by a one-way valve, and the middle grouting is controlled by a pressure control valve; the grouting pipe is equipped with a first pressure gauge and a first valve, which can be controlled according to geological conditions. The grouting pressure is controlled so that the grouting material can effectively seal the coal seam borehole; the casing and the water injection pipe are blocked by water injection, and the water injection pressure can be determined according to the engineering needs, which can make the outer circle of the expansion bag It fits closely with the inner wall of the casing to realize the effective sealing of coal seam drilling; the expansion bladder and water injection pipe can be reused, which reduces the cost of sealing holes. It has the characteristics of simple operation process, good functional effect, high safety performance and remarkable economic benefit.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Detailed ways

As shown in Figure 1, a combined coal seam water injection and gas extraction sealing device of the present utility model includes a first bladder 5, a second bladder 8, a casing 3, a grouting pipe 7 and an inner water injection plug device;

Taking the axial direction from the bottom of the hole to the opening of the borehole 16 as the direction from left to right, the first pouch 5 and the second pouch 8 are arranged in the borehole 16 at intervals from left to right, and the second pouch 8 Located at the opening of the borehole 16, the casing 3 passes through the second pocket 8 and the first pocket 5 along the axial direction of the borehole 16, and the grouting pipe 7 passes through the second pocket along a direction parallel to the casing 3. The pouch 8 extends into the first pouch 5, the left end of the grouting pipe 7 is blocked, and the grouting pipe 7 is provided with a first one-way valve 4, a pressure control valve 6 and a second one-way valve 9. The one-way valve 4 is located in the first bladder 5, the pressure control valve 6 is located in the annular cavity 17 between the first bladder 5 and the second bladder 8, and the second one-way valve 9 is located in the second bladder 8 , the inner water injection occluder is set in the casing 3 .

The left end of the casing 3 is provided with a screen tube 2 on the left side of the first bladder 5 .

The grouting pipe 7 is provided with a first pressure gauge 10 and a first valve 11 on the right side of the second bladder 8 .

The inner water injection occluder includes an expansion bladder 15, a water injection pipe 12 and a plugging water pipe 18. The expansion bladder 15 is arranged in the casing 3, and the water injection pipe 12 coaxially extends into the casing 3 and passes through the expansion bladder 15. The left end of the plugged water pipe 18 extends into the casing 3 and is connected with the expansion bladder 15. The blocked water pipe 18 is provided with a second pressure gauge 13 and a second valve 14 located on the right side of the borehole 16.

When the utility model is in use, at first the utility model is sent into the borehole 16 of the coal seam 1, and then the first capsule bag 5, the second capsule bag 8 and the first capsule bag 5 and the second capsule bag are supplied through the grouting pipe 7 Grouting is injected into the annular cavity 17 between the bladders 8, the slurry is injected into the first bladder 5 through the first one-way valve 4, injected into the second bladder 8 through the second one-way valve 9, and the first bladder 5 and the When the pressure of the slurry in the second bladder 8 reaches the opening pressure of the pressure control valve 6, the pressure control valve 6 is opened, and the slurry is injected into the annular cavity 17 through the pressure control valve 6. When the first pressure gauge 10 shows that the grouting pipe When the pressure in 7 reaches the predetermined pressure, close the first valve 11, so that the gap between the coal seam 1 and the outer circle of the casing 3 can be completely blocked by three-stage grouting; Water injection is carried out in the expansion bag 15, and the expansion bag 15 is filled with water, and the outer circle of the expansion bag 15 is sealed with the inner wall of the casing 3. When the second pressure gauge 13 shows that the pressure in the blocked water pipe 18 reaches a predetermined pressure, the second pressure gauge 13 can be closed. valve 14, so that the borehole 16 can be completely blocked; finally, water is injected into the borehole 16 through the water injection pipe 12, and is discharged into the borehole 16 through the screen pipe 2. Carry out water injection fracturing to increase the permeability of the coal seam, open the second valve 14 after the water injection is completed, drain the water in the expansion bladder 15 and take out the expansion bladder 15 and the water injection pipe 12 from the casing 3 for recycling and reuse; finally Connect the right end of casing 3 to the gas drainage system for gas drainage.

This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model belong to the technology of the utility model. protection scope of the program.

Claims (4)

1. A combined coal seam water injection and gas extraction sealing device, characterized in that: it comprises a first bladder, a second bladder, a casing, a grouting pipe and an inner water injection plugging device; Taking the axial direction of the borehole from the bottom of the hole to the orifice as the direction from left to right, the first pouch and the second pouch are arranged in the borehole at intervals from left to right, and the second pouch is located in the hole of the borehole At the mouth, the sleeve passes through the second bladder and the first bladder along the axial direction of the borehole, and the grouting tube passes through the second bladder in a direction parallel to the sleeve and then extends into the first bladder. The left end of the grouting pipe is blocked, and the grouting pipe is provided with a first one-way valve, a pressure control valve and a second one-way valve. The first one-way valve is located in the first bladder, and the pressure control valve is located between the first bladder and the first bladder. In the annular cavity between the second bladders, the second one-way valve is located in the second bladders, and the inner water injection occluder is arranged in the casing. 2. A combined coal seam water injection and gas extraction sealing device according to claim 1, characterized in that: the left end of the casing is provided with a screen located on the left side of the first bladder. 3. A combined coal seam water injection and gas extraction sealing device according to claim 2, characterized in that: the grouting pipe is provided with a first pressure gauge and a first valve on the right side of the second bladder. 4. A combined coal seam water injection and gas extraction sealing device according to claim 1, 2 or 3, characterized in that: the inner water injection occluder includes an expansion bladder, a water injection pipe and a plugging water pipe, and the expansion bladder The bag is set in the casing, the water injection pipe extends coaxially into the casing and passes through the expansion bag, the left end of the plugging water pipe extends into the casing and connects with the expansion bag, and the plugging water pipe is provided with a hole in the drilled hole The second pressure gauge and the second valve on the right side of the port.