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

Abstract

The utility model 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 utility model, 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 by utilizing 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 utility model belongs to the technical field of coal mine gas extraction, and particularly 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 the coal seam and gas concentration area, connect the drill hole to a dedicated pipeline, and use extraction equipment to extract the gas in the coal seam and goaf 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 re-develop, and as the extraction time increases, the extraction concentration will decrease and gas leakage will occur. This not only makes the coal mine tunnels full of gas, causing safety hazards, but also seriously affects the gas extraction efficiency, resulting in excessively long extraction time and mining imbalance. 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 utility model is to provide a hole sealer with a simple structure and low cost, which can discharge excess moisture and air to prevent the semi-hollow core phenomenon after drying and effectively seal to prevent leakage.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A three-blocking and two-injection filtration and return grouting hole sealer, comprising a grouting pipe, a filter return water pipe, and a return grouting and water filtering device arranged on the filter 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;

[0007] 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 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, which is located between the second bladder bag and the third bladder bag.

[0008] The filter return water pipe is arranged and passes 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 provided on the front section of the filter return water pipe located between the second bag and the third bag; the filter return water pipe is provided with a return slurry hole on the middle section of the pipe between the first bag and the second bag, and the middle section of the pipe is also provided with a first return slurry bursting valve and a glue injection seal; the return slurry hole, glue injection seal and first return slurry bursting valve are arranged in sequence along the axial direction from the second bag to the first bag.

[0009] Furthermore, 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 around the filtering hole.

[0010] 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.

[0011] Furthermore, the first pouch, the second pouch, and the third pouch are made of high-strength anti-static and flame-retardant elastic fabric.

[0012] Furthermore, the grouting pipe and the filter return pipe are made of PE material.

[0013] Furthermore, the grouting bursting valve includes a grouting hole opened on the grouting pipe and a PVC hose sleeved and wrapped around the grouting hole.

[0014] Furthermore, the first return slurry blasting valve, the second return slurry blasting valve and the third return slurry blasting valve each include a return slurry hole opened on the filter return water pipe and a PVC hose sheathed around the return slurry hole.

[0015] The beneficial effects of the present invention are:

[0016] By squeezing out moisture and air from the sealing cement, and using multiple blast valves to pressurize the high-concentration cement slurry into the coal and rock cracks surrounding the borehole, the system blocks air leaks. The slurry also strengthens the stability of the coal and rock formations, improving tunnel support, preventing deformation, coal seam spontaneous combustion, and rock bursts, representing a significant improvement over existing technologies.

[0017] 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 to 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

[0018] Figure 1This is a structural schematic diagram of a three-blocking and two-injection water filtration and slurry return hole sealing device shown in one embodiment of the present utility model.

[0019] Explanation of the accompanying symbols: 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 blasting valve; 8. Glue injection plugging; 9. Return slurry hole; 10. Second bladder bag; 11. Second return slurry blasting valve; 12. Front end return slurry water filtering device; 13. Third return slurry blasting valve; 14. Grouting blasting valve; 15. Third bladder bag; 16. Glue injection plug. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] 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.

[0024] See Figure 1The three-blocking and two-injection filtration and return grouting 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.

[0025] The above-mentioned bag is a double-layer hollow structure, and 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. The front end of the grouting pipe 3 is provided with a glue injection plug 16. The grouting pipe 3 is also provided with a grouting bursting valve 14, and the grouting bursting valve 14 is located between the second bag 10 and the third bag 15.

[0026] The filter return water pipe 1 is arranged and passes 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 provided with a return slurry hole 9 on the middle section of the pipeline between the first bag 4 and the second bag 10, and 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.

[0027] 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 filter cloth cylinders wrapped around the filter holes.

[0028] 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.

[0029] 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.

[0030] Working principle:

[0031] After fixing the device to the sealing pipe, insert the front end of the device into the drill hole, connect the grouting pipe 3 to the external grouting pump through the quick connector 2 and start injecting cement. After the three bags are filled with cement through the bag inlet hole 5, when the grouting pressure reaches 1-2 MPa, the cement breaks through the grouting burst 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 0-0.1 MPa.

[0032] During this period, the cement slurry concentration increases, and the high-concentration cement slurry continuously penetrates into the cracks around the coal rock in the borehole to block the borehole and the surrounding cracks. When the grouting pressure rises to 0.3-0.5 MPa, the moisture and air in the cement are squeezed and filtered through the front-end return slurry filter device 12 into the filter return pipe 1 and discharged. Subsequently, when the grouting pressure reaches 1.0 MPa-1.6 MPa, the cement breaks through the second return slurry blasting valve 11 and the third return slurry blasting valve 13, and under the action of the glue injection seal 8, it is injected into the coal mine rock layer between the first bag 4 and the second bag 10 through the return slurry hole 9 and the above process is repeated, and the moisture and air in the cement continue to be discharged out of the hole through the rear-end return slurry filter device 6;

[0033] When the grouting pressure reaches 1.5-2.0 MPa, the cement breaks through the first grouting blasting valve 7 and grouts outward, thus completing the process. At this point, 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.

[0034] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0035] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A three-blocking and two-injection water filtration and slurry sealing device, characterized in that: It includes a grouting pipe, a filter return pipe and a return slurry filter device arranged on the filter return pipe. The rear end of the grouting pipe is provided with a quick plug connector. 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 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, which is located between the second bladder bag and the third bladder bag. The filter return water pipe is arranged and passes 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 provided on the front section of the filter return water pipe located between the second bag and the third bag; the filter return water pipe is provided with a return slurry hole on the middle section of the pipe between the first bag and the second bag, and the middle section of the pipe is also provided with a first return slurry bursting valve and a glue injection seal; the return slurry hole, glue injection seal and 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 filter return water pipe and a filtering cloth cylinder wrapped around 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 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 sheathed 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 return slurry bursting valve, the second return slurry bursting valve and the third return slurry bursting valve all include a return slurry hole opened on the filter return water pipe and a PVC hose sheathed and wrapped around the return slurry hole.

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