Drilling and sealing device

Abstract

The utility model relates to the technical field of coal mines, in particular to a hole drilling and sealing device which comprises an extraction pipe, a first bag and a second bag, one end of the extraction pipe is suitable for extending into a drill hole, and the extraction pipe comprises a first extraction pipe and a second extraction pipe. The second extraction pipe is communicated with the first extraction pipe and is sequentially arranged in the extending direction of the first extraction pipe, the diameter of the second extraction pipe is smaller than that of the first extraction pipe, and the first bag and the second bag are arranged in the length direction of the extraction pipe in a spaced mode; the first extraction pipe is sleeved with the first bag so as to seal a gap between the first extraction pipe and the inner wall of a drill hole, the first extraction pipe is sleeved with the second bag so as to seal the gap between the first extraction pipe and the inner wall of the drill hole, and therefore a sealed grouting cavity is formed between the first bag and the second bag. The drilling and sealing quality can be improved, and then the gas extraction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mines, in particular to a drilling and sealing device. Background Art

[0002] Coal mine gas extraction is to drill into the coal seam and gas concentration area, connect the borehole to a dedicated pipeline, and use extraction equipment to extract the gas in the coal seam and goaf to the ground for use; or discharge it into the total return air flow. In the related technology, a gas extraction drilling is performed in the coal seam and sealed to form a sealing structure. However, the coal body around the drilling sealing structure is easily affected by the change of goaf pressure and cracks are generated, which affects the gas extraction efficiency. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model proposes a drilling hole sealing device, which can improve the drilling hole sealing quality and thus improve the gas extraction efficiency.

[0004] The drilling sealing device of the embodiment of the utility model comprises: an extraction tube, one end of which is suitable for extending into the borehole, the extraction tube comprising a first extraction tube and a second extraction tube, the second extraction tube is connected to the first extraction tube and is arranged in sequence along the extension direction of the first extraction tube, and the diameter of the second extraction tube is smaller than the diameter of the first extraction tube; a first bag and a second bag, the first bag and the second bag are arranged at intervals in the length direction of the extraction tube, the first bag is sleeved on the first extraction tube to close the gap between the first extraction tube and the inner wall of the borehole, and the second bag is sleeved on the first extraction tube to close the gap between the extraction tube and the inner wall of the borehole, so as to form a closed grouting cavity between the first bag and the second bag.

[0005] The drilling hole sealing device of the embodiment of the utility model can improve the drilling hole sealing quality and further improve the gas extraction efficiency.

[0006] In some embodiments, a plurality of extraction holes are provided on the second extraction tube, and the plurality of extraction holes are divided into a plurality of extraction hole groups, and the plurality of extraction hole groups are arranged at intervals in the extension direction of the extraction tube, and each extraction hole group includes a plurality of extraction holes arranged at intervals in the circumferential direction of the second extraction tube.

[0007] In some embodiments, a dimension of the second extraction tube in the extension direction of the extraction tube is greater than a dimension of the first extraction tube in the extension direction of the extraction tube.

[0008] In some embodiments, the borehole sealing device further includes a connecting piece, one end of which is connected to the first extraction pipe, and the other end of which is connected to the second extraction pipe.

[0009] In some embodiments, the first bag is arranged adjacent to an opening of a borehole, and a spacing distance A is between an end of the first bag away from the second bag and the opening of the borehole, and 10 m≤A≤15 m.

[0010] In some embodiments, a spacing distance between an end of the second bladder bag away from the first bladder bag and an end of the connector adjacent to the second extraction tube is B, where B=0.5 m.

[0011] In some embodiments, the drilling and sealing device further includes a grouting pipe, one end of which passes through the first bag and the grouting cavity in sequence and extends into the second bag.

[0012] In some embodiments, the drilling hole sealing device further includes a first one-way valve, which is installed on the grouting pipe and is located in the first bag to prevent the slurry in the first bag from flowing back.

[0013] In some embodiments, the drilling sealing device further includes a second one-way valve, which is installed on the grouting pipe and is located in the second bag to prevent the slurry in the second bag from flowing back.

[0014] In some embodiments, the drilling hole sealing device also includes a bursting valve, which is installed on the grouting pipe and located in the grouting cavity. The bursting valve is used to inject slurry into the grouting cavity when the grouting pressure is greater than or equal to the bursting pressure of the bursting valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a drilling and sealing device according to an embodiment of the utility model.

[0016] Reference numerals:

[0017] Extraction pipe 1, first extraction pipe 11, second extraction pipe 12, extraction hole 121,

[0018] A first pouch 21, a second pouch 22,

[0019] Grouting cavity 3, connecting piece 4,

[0020] Grouting pipe 5, first one-way valve 6, second one-way valve 7, bursting valve 8. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0022] The drilling sealing device of the embodiment of the utility model comprises an extraction tube 1, a first bag 21 and a second bag 22. One end of the extraction tube 1 is suitable for extending into the borehole, and the extraction tube 1 comprises a first extraction tube 11 and a second extraction tube 12, the second extraction tube 12 is connected with the first extraction tube 11 and arranged in sequence along the extension direction of the first extraction tube 11, and the diameter of the second extraction tube 12 is smaller than the diameter of the first extraction tube 11. The first bag 21 and the second bag 22 are arranged at intervals in the length direction of the extraction tube 1, the first bag 21 is sleeved on the first extraction tube 11 to seal the gap between the first extraction tube 11 and the inner wall of the borehole, and the second bag 22 is sleeved on the first extraction tube 11 to seal the gap between the extraction tube 1 and the inner wall of the borehole, so as to form a closed grouting cavity 3 between the first bag 21 and the second bag 22.

[0023] Specifically, Figure 1 As shown, the right end of the extraction tube 1 extends into the borehole, the first extraction tube 11 and the second extraction tube 12 are arranged in sequence in the left and right directions, the first extraction tube 11 is located on the left side of the second extraction tube 12, and the right end of the first extraction tube 11 is connected to the left end of the second extraction tube 12.

[0024] The first bag 21 and the second bag 22 are arranged at intervals in the left-right direction. The first bag 21 is located on the left side of the second bag 22. The first bag 21 is sleeved on the first extraction tube 11 and abuts against the inner wall of the borehole to form a first plugging section. The second bag 22 is sleeved on the first extraction tube 11 and abuts against the inner wall of the borehole to form a second plugging section. A grouting cavity 3 is formed between the first plugging section and the second plugging section, and a plugging portion is formed by grouting into the grouting cavity 3.

[0025] For example, the spacing distance between the first bag 21 and the second bag 22 is C, and C≥8m. By limiting the spacing distance between the first bag 21 and the second bag 22, the size of the sealing part in the left and right directions is ensured, and the sealing effect of the sealing hole is ensured.

[0026] For example, the diameter of the first extraction tube 11 is 50 mm, and the diameter of the second extraction tube 12 is 32 mm.

[0027] The diameter of the second extraction tube 12 of the drilling and sealing device of the embodiment of the utility model is smaller than the diameter of the first extraction tube 11. Accordingly, when drilling a coal body, two drill bits of different diameters can also be used for drilling. For example, the first drill bit is used to drill a hole of the first diameter first, and then the second drill bit is used to drill a hole of the second diameter, and the second diameter is smaller than the first diameter, so that the spacing distance between the second extraction tube 12 and the inner wall of the borehole is the same as the spacing distance between the first extraction tube 11 and the inner wall of the borehole, thereby reducing the diameter of the borehole, thereby reducing the damage of the drilling to the surrounding coal body structure, and improving the stability of the coal body.

[0028] The drilling sealing device of the embodiment of the utility model increases the space of the grouting chamber 3 by setting the diameter of the second extraction tube 12 to be smaller than the diameter of the first extraction tube 11, and the first bag 21 and the second bag 22 are both sleeved on the first extraction tube 11 to form a first plugging section and a second plugging section. The increase in the space of the grouting chamber 3 can further increase the volume of the plugging part. Since the plugging part can suppress the deformation of the coal body in the borehole and prevent the formation of a gas leakage channel, the volume of the plugging part is increased, the quality of drilling sealing is improved, thereby improving the gas extraction efficiency.

[0029] In some embodiments, a plurality of extraction holes 121 are provided on the second extraction tube 12, and the plurality of extraction holes 121 are divided into a plurality of extraction hole groups. The plurality of extraction hole groups are arranged at intervals in the extension direction of the extraction tube 1, and each extraction hole group includes a plurality of extraction holes 121 arranged at intervals in the circumferential direction of the second extraction tube.

[0030] Specifically, Figure 1 As shown, the second extraction pipe 12 has multiple groups of extraction hole groups arranged at intervals in the left-right direction, and each group of extraction hole groups includes multiple extraction holes 121 arranged at intervals along the circumference of the second extraction pipe 12. It can be understood that the extraction holes 121 are provided on the entire pipe body of the second extraction pipe 12, that is, the second extraction pipe 12 is provided with extraction holes 121 from the left end to the right end. Compared with the arrangement of the extraction holes 121 only at the end of the extraction pipe 1 in the related art, the embodiment of the utility model improves the gas extraction efficiency by providing the extraction holes 121 on the entire pipe body of the second extraction pipe 12.

[0031] In some embodiments, the dimension of the second extraction tube 12 in the extension direction of the extraction tube 1 is greater than the dimension of the first extraction tube 11 in the extension direction of the extraction tube 1 .

[0032] Specifically, by setting the left-right dimension of the second extraction pipe 12 to be larger than the left-right dimension of the first extraction pipe 11, the size of the borehole where the second extraction pipe 12 is located is further reduced, thereby reducing damage to the coal body caused by the borehole and improving the stability of the coal body.

[0033] For example, the dimensions of the first extraction pipe 11 in the left-right direction are 20 meters, 21 meters, and 22 meters, and the dimensions D of the second extraction pipe 12 in the left-right direction are 58 meters, 60 meters, and 61 meters.

[0034] In some embodiments, the drilling sealing device further includes a connecting member 4 , one end of the connecting member 4 is connected to the first extraction pipe 11 , and the other end of the connecting member 4 is connected to the second extraction pipe 12 .

[0035] Specifically, the left end of the connecting member 4 is connected to the first extraction tube 11 , and the right end of the connecting member 4 is connected to the second extraction tube 12 . The setting of the connecting member 4 facilitates the connection between the first extraction tube 11 and the second extraction tube 12 .

[0036] For example, the connecting piece 4 and the first extraction tube 11 and the second extraction tube 12 can be set to be threadedly connected. Since the diameter of the second extraction tube 12 is smaller than the diameter of the first extraction tube 11, that is, the diameter of the left end of the connecting piece 4 is larger than the diameter of the right end of the connecting piece 4, a first internal thread is provided on the inner wall of the left end of the connecting piece 4, and a first external thread matching the first internal thread is provided on the outer wall of the right end of the first extraction tube 11, so as to realize the threaded connection between the connecting piece 4 and the first extraction tube 11. A second internal thread is provided on the inner wall of the right end of the connecting piece 4, and a second external thread matching the second internal thread is provided on the outer wall of the left end of the second extraction tube 12, so as to realize the threaded connection between the connecting piece 4 and the second extraction tube 12. The embodiment of the utility model does not limit the connection relationship between the connecting piece 4 and the first extraction tube 11 and the second extraction tube 12, as long as the connection between the first extraction tube 11 and the second extraction tube 12 can be realized.

[0037] In some embodiments, the first pouch 21 is arranged adjacent to the opening of the borehole, and a spacing distance A is provided between an end of the first pouch 21 away from the second pouch 22 and the opening of the borehole, and 10 m≤A≤15 m.

[0038] Specifically, the first bag 21 is located on the left side of the second bag 22, that is, the first bag 21 is arranged adjacent to the opening of the borehole, and the second bag 22 is arranged away from the opening of the borehole. By limiting the minimum spacing distance and the maximum spacing distance between the left end of the first bag 21 and the opening of the borehole, compared with the related art, this embodiment increases the sealing depth by setting the distance of the first bag 21 into the borehole, which can effectively avoid the reduction of the drilling extraction effect due to the collapse of the hole, thereby improving the utilization rate of the borehole and extending the life of the borehole.

[0039] For example, the spacing distances between the left end of the first bladder bag 21 and the opening of the drilled hole are 10 m, 11 m, 11.5 m, 12 m, 13 m, 14 m, and 15 m.

[0040] In some embodiments, the spacing distance between the end of the second bag 22 away from the first bag 21 and the end of the connector 4 adjacent to the second extraction tube 12 is B, where B=0.5 m.

[0041] Specifically, the spacing distance between the right end of the second bag 22 and the right end of the connecting piece 4 is 0.5 meters. By arranging the second bag 22 adjacent to the right end of the first extraction tube 11, the position of the second blocking section is limited, ensuring the size of the blocking portion and reserving space for the connection between the connecting piece 4 and the first extraction tube 11, thereby facilitating the installation of the connecting piece 4 and further facilitating the connection between the first extraction tube 11 and the second extraction tube 12.

[0042] In some embodiments, the drilling and sealing device further includes a grouting pipe 5 , one end of which passes through the first bag 21 and the grouting cavity 3 in sequence and extends into the second bag 22 .

[0043] Specifically, the right end of the grouting pipe 5 passes through the first bag 21 and the grouting cavity 3 in sequence and then extends into the second bag 22, so that the grouting pipe 5 can inject slurry into the first bag 21 and the second bag 22 respectively. The first bag 21 and the second bag 22 are filled with slurry and abut against the inner wall of the borehole to form a first blocking section and a second blocking section, thereby forming a grouting cavity 3 between the first bag 21 and the second bag 22, and the grouting pipe 5 then injects slurry into the grouting cavity 3 to form a blocking portion.

[0044] In some embodiments, the drilling sealing device further includes a first one-way valve 6 , which is installed on the grouting pipe 5 and is located in the first bag 21 to prevent the slurry in the first bag 21 from flowing back.

[0045] Specifically, the setting of the first one-way valve 6 avoids the slurry backflow, so that the slurry can only flow from the left side to the right side of the first one-way valve 6 but not from the right side to the left side of the first one-way valve 6, thereby ensuring the sealing stability of the slurry in the first bag 21.

[0046] In some embodiments, the drilling sealing device further includes a second one-way valve 7 , which is installed on the grouting pipe 5 and is located in the second bag 22 to prevent the slurry in the second bag 22 from flowing back.

[0047] Specifically, the second one-way valve 7 prevents the slurry from flowing back, so that the slurry can only flow from the left side to the right side of the second one-way valve 7 but not from the right side to the left side of the second one-way valve 7, thereby ensuring the sealing stability of the slurry in the second bag 22.

[0048] In some embodiments, the drilling sealing device also includes a bursting valve 8, which is installed on the grouting pipe 5 and located in the grouting cavity 3. The bursting valve 8 is used to inject slurry into the grouting cavity 3 when the grouting pressure is greater than or equal to the bursting pressure of the bursting valve 8.

[0049] Specifically, the bursting valve 8 is installed on the grouting pipe 5 and is located in the grouting cavity 3. When the grouting pressure is low, the bursting valve 8 is not activated. The slurry in the grouting pipe 5 first flows to the first bag 21 and the second bag 22 to form the first blocking section and the second blocking section through the setting of the bursting valve 8, ensuring that the grouting cavity 3 is formed between the first bag 21 and the second bag 22. When the grouting pressure gradually increases until it is greater than or equal to the bursting pressure of the bursting valve 8, the bursting valve 8 is opened, and the grouting pipe 5 injects slurry into the grouting cavity 3.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] It is understandable that the above embodiments are exemplary and cannot be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A drilling and sealing device, characterized in that: include: An extraction pipe, one end of which is suitable for extending into the borehole, the extraction pipe comprising a first extraction pipe and a second extraction pipe, the second extraction pipe is connected to the first extraction pipe and arranged in sequence along the extension direction of the first extraction pipe, and the diameter of the second extraction pipe is smaller than the diameter of the first extraction pipe; A first bag and a second bag, wherein the first bag and the second bag are arranged at intervals in the length direction of the extraction tube, the first bag is sleeved on the first extraction tube to close the gap between the first extraction tube and the inner wall of the borehole, and the second bag is sleeved on the first extraction tube to close the gap between the extraction tube and the inner wall of the borehole, so as to form a closed grouting cavity between the first bag and the second bag.

2. The drilling and sealing device according to claim 1, characterized in that: The second extraction tube is provided with a plurality of extraction holes, which are divided into a plurality of extraction hole groups, which are arranged at intervals in the extension direction of the extraction tube, and each extraction hole group includes a plurality of extraction holes arranged at intervals in the circumferential direction of the second extraction tube.

3. The drilling and sealing device according to claim 2, characterized in that: A dimension of the second extraction tube in the extension direction of the extraction tube is greater than a dimension of the first extraction tube in the extension direction of the extraction tube.

4. The drilling and sealing device according to claim 1, characterized in that: It also includes a connecting piece, one end of which is connected to the first extraction pipe, and the other end of which is connected to the second extraction pipe.

5. The drilling and sealing device according to claim 4, characterized in that: The first bladder bag is arranged adjacent to the opening of the borehole, and a spacing distance A is between an end of the first bladder bag away from the second bladder bag and the opening of the borehole, 10m≤A≤15m.

6. The drilling and sealing device according to claim 5, characterized in that: The spacing distance between the end of the second bag away from the first bag and the end of the connecting piece adjacent to the second extraction pipe is B, where B=0.5 m.

7. The drilling and sealing device according to claim 1, characterized in that: It also includes a grouting pipe, one end of which passes through the first bag and the grouting cavity in sequence and extends into the second bag.

8. The drilling and sealing device according to claim 7, characterized in that: It also includes a first one-way valve, which is installed on the grouting pipe and is located in the first bladder bag to prevent the slurry in the first bladder bag from flowing back.

9. The drilling and sealing device according to claim 8, characterized in that: It also includes a second one-way valve, which is installed on the grouting pipe and is located in the second bladder bag to prevent the slurry in the second bladder bag from flowing back.

10. The drilling and sealing device according to claim 9, characterized in that: It also includes a bursting valve, which is installed on the grouting pipe and located in the grouting cavity. The bursting valve is used to inject slurry into the grouting cavity when the grouting pressure is greater than or equal to the bursting pressure of the bursting valve.

Images