Three-blocking two-injecting water filtering and slurry returning hole packer

Abstract

The invention relates to a three-blocking two-injecting water filtering and slurry returning hole packer, and belongs to the technical field of coal mine gas extraction. The device comprises a grouting pipe, a filtering water return pipe and a grout returning and water filtering device arranged on the filtering water return pipe, a quick connector is arranged at the rear end of the grouting pipe, and a first bag, a second bag and a third bag are arranged on the rear portion, the middle portion and the front portion of the grouting pipe respectively. According to the method, moisture and air in hole sealing cement are extruded and discharged, and high-concentration cement paste is extruded into peripheral coal rock gaps in a drill hole through pressurization of a plurality of explosion valves, so that an air leakage channel is blocked. And the stability of the coal rock layer is also enhanced by filling the cement paste. The roadway support is improved, roadway deformation is prevented, coal seam spontaneous combustion is prevented, rock burst is prevented, and compared with the prior art, great improvement is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine gas extraction, and in particular relates to a three-blocking and two-injection water filtration and slurry return hole sealing device. Background Art

[0002] Coal mine gas extraction is to drill into coal seams and gas concentration areas, connect the boreholes to special pipelines, and use extraction equipment to extract the gas in the coal seams and goafs to the ground for utilization; or discharge it into the total return air flow. Gas extraction is not only an important measure to reduce the amount of gas outburst during the mining process, prevent gas exceeding the limit and accumulation, and prevent gas explosions and coal and gas outburst accidents, but also can turn harm into benefit and be developed and utilized as a resource associated with coal.

[0003] However, the existing sealing technology for coal mine gas extraction holes generally adopts a two-blocking and one-injection process. After the holes are sealed using this method, they are affected by dynamic pressure, and residual moisture and air will remain in the sealing cement, resulting in a semi-hollow core phenomenon after drying. The cracks around the borehole will develop again, and as the extraction time increases, the extraction concentration will decrease and gas leakage will occur. Not only will the coal mine tunnels be filled with gas, causing safety hazards, but it will also seriously affect the gas extraction efficiency, resulting in excessively long extraction time and mining imbalances. The low-concentration gas extracted is difficult to meet the concentration requirements for gas power generation, and ultimately leads to excessively high overall costs. Summary of the invention

[0004] The purpose of the present invention is to provide a hole sealer with simple structure and low cost, which can discharge excess moisture and air to prevent semi-hollow core phenomenon after drying and effectively seal to prevent leakage.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: A three-blocking and two-injection water filtering and grouting hole sealing device comprises a grouting pipe, a filtering and returning water pipe and a returning and filtering water device arranged on the filtering and returning water pipe, wherein a quick-plug connector is arranged at the rear end of the grouting pipe, and a first bag, a second bag and a third bag are arranged at the rear, middle and front parts of the grouting pipe respectively; The bladder bags are all double-layer hollow structures. The grouting pipe is inserted into the interlayer of the bladder bag. The grouting pipe is located on the tube wall inside the bladder bag and is provided with a slurry inlet hole. The front end of the grouting pipe is provided with a glue injection plug. The grouting pipe is also provided with a grouting bursting valve, and the grouting bursting valve is located between the second bladder bag and the third bladder bag. The filter return pipe is arranged to pass through the interlayer between the first bag and the second bag, and the second return slurry bursting valve and the third return slurry bursting valve are arranged on the front section of the filter return pipe between the second bag and the third bag; a return slurry hole is opened on the middle section of the filter return pipe between the first bag and the second bag, and the first return slurry bursting valve and the glue injection plugging are also arranged on the middle section of the pipe; the return slurry hole, the glue injection plugging and the first return slurry bursting valve are arranged in sequence along the axial direction from the second bag to the first bag.

[0006] Furthermore, the return slurry filtering device is a combined structure of a filtering hole opened on the filtering return water pipe and a filtering cloth cylinder wrapped on the filtering hole.

[0007] Furthermore, the return slurry water filtering device includes a front-end return slurry water filtering device and a rear-end return slurry water filtering device, the front-end return slurry water filtering device is located between the second return slurry bursting valve and the third return slurry bursting valve, and the rear-end return slurry water filtering device is located between the first return slurry bursting valve and the first bag.

[0008] Furthermore, the first pouch, the second pouch and the third pouch are made of high-strength anti-static and flame-retardant elastic fabric.

[0009] Furthermore, the grouting pipe and the filter return pipe are made of PE material.

[0010] Furthermore, the grouting bursting valve comprises a grouting hole opened on the grouting pipe and a PVC hose sleeved and wrapped around the grouting hole.

[0011] Furthermore, the first slurry return bursting valve, the second slurry return bursting valve and the third slurry return bursting valve each include a slurry return hole provided on the filter return pipe and a PVC hose sleeved and wrapped around the slurry return hole. The beneficial effects of the present invention are: By squeezing out the water and air in the sealing cement, and using multiple bursting valves to pressurize the high-concentration cement slurry into the coal-rock gaps around the borehole, the air leakage channel is blocked. The filling of cement slurry also strengthens the stability of the coal-rock layer. It improves the support of the tunnel, prevents tunnel deformation, prevents spontaneous combustion of the coal seam, and prevents impact ground pressure, which is a significant improvement compared to existing technologies.

[0012] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a three-blocking and two-injection water filtration and slurry return hole sealer shown in one embodiment of the present invention.

[0014] Explanation of the accompanying drawings: 1. Filter return water pipe; 2. Quick connector; 3. Grouting pipe; 4. First bladder bag; 5. Bladder bag slurry inlet hole; 6. Rear end return slurry water filtering device; 7. First return slurry bursting valve; 8. Glue injection plugging; 9. Return slurry hole; 10. Second bladder bag; 11. Second return slurry bursting valve; 12. Front end return slurry water filtering device; 13. Third return slurry bursting valve; 14. Grouting bursting valve; 15. Third bladder bag; 16. Glue injection plug. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] See also Figure 1 The three-blocking and two-injection filtration and return grouting hole sealer shown in a preferred embodiment of the present application includes a grouting pipe 3 and a filtration return water pipe 1. The rear end of the grouting pipe 3 is provided with a quick-connect connector 2 for connecting a cement pump; the rear, middle and front parts of the grouting pipe 3 are respectively provided with a first bag 4, a second bag 10 and a third bag 15.

[0020] The above-mentioned bag is a double-layer hollow structure, the grouting pipe 3 is inserted into the interlayer of the bag, the grouting pipe 3 is located on the tube wall inside the bag and is provided with a bag slurry inlet hole 5, a glue injection plug 16 is provided at the front end of the grouting pipe 3, and a grouting bursting valve 14 is also provided on the grouting pipe 3, and the grouting bursting valve 14 is located between the second bag 10 and the third bag 15.

[0021] The filter return water pipe 1 is arranged to pass through the interlayer between the first bag 4 and the second bag 10. The front section of the filter return water pipe 1 between the second bag 10 and the third bag 15 is provided with a second return slurry bursting valve 11, a front end return slurry water filtering device 12 and a third return slurry bursting valve 13; the filter return water pipe 1 is arranged on the middle section of the pipeline between the first bag 4 and the second bag 10. The rear side of the return slurry hole 9 is sequentially provided with a first return slurry bursting valve 7 and a rear end return slurry water filtering device 6. Furthermore, a glue injection seal 8 is provided between the return slurry hole 9 and the first return slurry bursting valve 7.

[0022] Specifically, the front-end return water filtering device 12 and the rear-end return water filtering device 6 include filter holes opened on the filter return water pipe 1 and a filter cloth cylinder wrapped on the filter holes.

[0023] Specifically, the grouting bursting valve 14 is a combined structure of a grouting hole opened on the grouting pipe 3 and a PVC hose sleeved on the surface of the grouting hole.

[0024] Specifically, the first, second and third return slurry bursting valves 13 are a combination structure of a return slurry hole opened on the filter return water pipe 1 and a PVC hose sleeved on the surface of the return slurry hole.

[0025] Working principle: After fixing the device to the sealing pipe, insert the front end of the device into the borehole, connect the grouting pipe 3 to the external grouting pump through the quick-plug connector 2 and start injecting cement. After the cement fills the three bags through the bag grouting holes 5, when the grouting pressure reaches 1-2Mpa, the cement breaks through the grouting bursting valve 14 under the action of pressure and is injected into the coal mine rock layer between the second bag 10 and the third bag 15. At this time, the grouting pressure is reduced to 0-0.1Mpa; During this period, the cement slurry concentration increases, and the high-concentration cement slurry continuously penetrates into the gaps around the coal rock in the borehole to block the borehole and the surrounding gaps. When the grouting pressure rises to 0.3-0.5MPa, the water and air in the cement are squeezed and filtered through the front-end return slurry filter device 12 into the filter return water pipe 1 and discharged. Then, when the grouting pressure reaches 1.0MPa-1.6MPa, the cement breaks through the second return slurry bursting valve 11 and the third return slurry bursting valve 13, and is injected into the coal mine rock layer between the first bag 4 and the second bag 10 through the return slurry hole 9 under the action of the glue injection plugging 8, and the above process is repeated to continue to discharge the water and air in the cement out of the hole through the rear-end return slurry filter device 6; When the grouting pressure reaches 1.5-2.0 MPa, cement breaks through the first grouting bursting valve 7 and grouts outward, and the work process ends. At this time, the entire sealing section and the surrounding coal-rock gaps have been completely filled with high-concentration cement slurry, achieving the purpose of segmented grouting and sealing.

[0026] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0027] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A three-blocking and two-injection water filtration and slurry return hole sealing device, characterized in that: It comprises a grouting pipe, a filtering return water pipe and a return grouting water filtering device arranged on the filtering return water pipe, the rear end of the grouting pipe is provided with a quick plug connector, and the rear, middle and front parts of the grouting pipe are respectively provided with a first bag, a second bag and a third bag; The bladder bags are all double-layer hollow structures. The grouting pipe is inserted into the interlayer of the bladder bag. The grouting pipe is located on the tube wall inside the bladder bag and is provided with a slurry inlet hole. The front end of the grouting pipe is provided with a glue injection plug. The grouting pipe is also provided with a grouting bursting valve, and the grouting bursting valve is located between the second bladder bag and the third bladder bag. The filter return pipe is arranged to pass through the interlayer between the first bag and the second bag, and the second return slurry bursting valve and the third return slurry bursting valve are arranged on the front section of the filter return pipe between the second bag and the third bag; a return slurry hole is opened on the middle section of the filter return pipe between the first bag and the second bag, and the first return slurry bursting valve and the glue injection plugging are also arranged on the middle section of the pipe; the return slurry hole, the glue injection plugging and the first return slurry bursting valve are arranged in sequence along the axial direction from the second bag to the first bag.

2. The three-blocking and two-injection water filtration and slurry return hole sealing device according to claim 1 is characterized in that: The return slurry filtering device is a combined structure of a filtering hole provided on the filtering return water pipe and a filtering cloth cylinder wrapped on the filtering hole.

3. The three-blocking and two-injection water filtration and slurry return hole sealing device according to claim 1, characterized in that: The return slurry water filtering device includes a front-end return slurry water filtering device and a rear-end return slurry water filtering device. The front-end return slurry water filtering device is located between the second return slurry bursting valve and the third return slurry bursting valve, and the rear-end return slurry water filtering device is located between the first return slurry bursting valve and the first bladder bag.

4. The three-blocking and two-injection water filtration and slurry return hole sealing device according to claim 1, characterized in that: The first pouch, the second pouch and the third pouch are made of high-strength anti-static and flame-retardant elastic fabric.

5. The three-blocking and two-injection water filtration and slurry return hole sealing device according to claim 1, characterized in that: The grouting pipe and the filter return pipe are made of PE material.

6. The three-blocking and two-injection water filtration and slurry return hole sealing device according to claim 1, characterized in that: The grouting bursting valve comprises a grouting hole provided on the grouting pipe and a PVC hose which is sleeved and wrapped around the grouting hole.

7. The three-blocking and two-injection water filtration and slurry return hole sealing device according to claim 1, characterized in that: The first slurry return bursting valve, the second slurry return bursting valve and the third slurry return bursting valve all include a slurry return hole opened on the filter return water pipe and a PVC hose sleeved and wrapped around the slurry return hole.

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