A device suitable for supporting a gas extraction borehole

Abstract

A device for supporting boreholes in gas extraction is provided, comprising four support petals (1) arranged in a tubular shape, each support petal connected by a support petal membrane (2), a laser hole platform (3) at one end of each support petal, and a support petal unfolding threaded jack (4) located at the center of the four tubular support petals (1); a plate through groove is provided at one end of the support petal body (1-4) to install a laser hole platform mounting seat (1-3), the laser hole platform is installed in the laser hole platform mounting seat by a buckle or screw, and one long side of the support petal body is provided with three or more support petal clamping plate spring shafts (1-2), each support petal clamping plate spring shaft is equipped with a support petal unfolding clamping plate (1-1). This invention can provide support directly after drilling a certain distance and allow the drill bit to continue drilling in the supported borehole, effectively preventing borehole collapse caused by excessively long boreholes and untimely support.

Description

Technical Field

[0001] This invention relates to the field of coal seam gas drainage borehole technology, specifically a device suitable for supporting gas drainage boreholes. Background Technology

[0002] After a gas drainage hole is drilled, it can remain stable in a relatively stable coal seam. However, if it encounters a soft coal seam, it is very easy for the hole to collapse. Especially during the drilling process, once the drill rod is removed, the hole will collapse, which will have an unnecessary impact on the gas drainage work. The current hole support scheme is a fixed diameter support pipe, which must be deployed in one go. If the hole collapses when the support pipe is inserted, the hole needs to be re-drilled, which is time-consuming and labor-intensive.

[0003] Currently, utility model patent CN214660327U discloses a support device for coal seam gas drainage boreholes. This support device includes a support body and an elastic support leg mechanism. The elastic support leg mechanism includes at least two legs hinged to the support body. The support body has a receiving groove for accommodating the legs. Each leg has an elastic element for controlling the leg's ejection from the receiving groove to support the borehole, and a check valve component for preventing the leg from retracting back into the receiving groove after ejection. This utility model can effectively support the borehole and prevent borehole collapse. This utility model is applicable to use in coal seam gas drainage boreholes for borehole support. Although this application provides further borehole support, it is still a fixed-diameter support pipe type support device. During installation, it still needs to be supported in place all at once after the borehole is drilled. If borehole collapse occurs, it still needs to be re-drilled, which is time-consuming and labor-intensive. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a device suitable for supporting boreholes in gas drainage, which can directly provide support after drilling a certain distance and allow the drill bit to continue drilling in the supported borehole, effectively preventing borehole collapse caused by excessively long boreholes and untimely support.

[0005] To achieve the above objectives, the present invention provides a device suitable for borehole support in gas drainage, comprising support flaps, support flap membranes, a laser borehole platform, and a support flap deployment threaded jack. The four support flaps are arranged in a tubular configuration, connected by support flap membranes. A laser borehole platform is located at one end of each support flap, and the support flap deployment threaded jack is positioned at the center of the four tubular support flaps. Each support flap includes a support flap deployment locking plate, a support flap locking plate spring shaft, a laser borehole platform mounting base, a support flap body, a support flap deployment locking plate slot, and a support flap deployment threaded jack. The support flap body has a jack limiting groove and a coagulant injection hole. A through groove is opened at one end of the support flap body to install a laser hole platform mounting base. The laser hole platform is installed in the laser hole platform mounting base by a buckle or screw. One long side of the support flap body has more than three support flap clamping plate spring shafts. Each support flap clamping plate spring shaft is equipped with a support flap deployment clamping plate. The other long side of the support flap body has a support flap deployment clamping plate slot. The position of the support flap deployment clamping plate slot corresponds to the support flap deployment clamping plate. A support flap deployment threaded jack limiting groove is opened on the inner surface of the support flap deployment clamping plate slot.

[0006] As a further improvement of the present invention, the support flap unfolding threaded jack includes a connecting shaft, a screw rod, and mechanical jacks. The connecting shaft is fixedly connected to one end of the screw rod, and two mechanical jacks are mounted on the screw rod. The two mechanical jacks are arranged in a cross shape and respectively engage with the support flap unfolding threaded jack limiting groove of their respective support flaps.

[0007] As a further improvement of the present invention, the inner surface of the support valve body is provided with a coagulant injection hole.

[0008] As a further improvement of the present invention, the coagulant injection hole is connected to the coagulant spray hole on the outside of the support valve body through a pipeline built into the support valve body.

[0009] By means of the above scheme, the present invention has at least the following advantages: compared with conventional support devices, by drilling a certain distance and then supporting, and then drilling and supporting again, the drill bit can continue to drill in the supported borehole, which can effectively prevent borehole collapse caused by excessively long boreholes and untimely support. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of the standby state of the present invention;

[0011] Figure 2 This is a perspective view of the unfolded state of the present invention;

[0012] Figure 3 This is a three-dimensional view of the support flap of the present invention;

[0013] Figure 4 This is a side view of the support flap unfolding threaded jack of the present invention;

[0014] In the diagram: 1. Support valve; 1-1. Support valve deployment plate; 1-2. Support valve plate spring shaft; 1-3. Laser hole stage mounting base; 1-4. Support valve body; 1-5. Support valve deployment plate slot; 1-6. Support valve deployment threaded jack limiting slot; 1-7. Coagulant injection hole; 2. Support valve membrane; 3. Laser hole stage; 4. Support valve deployment threaded jack; 4-1. Connecting shaft; 4-2. Screw; 4-3. Mechanical jack. Detailed Implementation

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] like Figures 1 to 3 As shown, a device suitable for supporting boreholes in gas drainage includes support petals 1, support petal membranes 2, laser borehole platforms 3, and support petal deployment threaded jacks 4. The four support petals 1 are arranged in a tubular configuration, connected by support petal membranes 2. A laser borehole platform 3 is located at one end of each support petal 1, helping construction personnel determine whether the support device has been deployed correctly. The support petal deployment threaded jacks 4 are located at the center of the four tubular support petals 1. Each support petal 1 includes a support petal deployment locking plate 1-1, a support petal locking plate spring shaft 1-2, a laser borehole platform mounting base 1-3, a support petal body 1-4, a support petal deployment locking plate slot 1-5, and a support petal deployment threaded jack. The top limiting groove 1-6 and the coagulant injection hole 1-7 are provided. A through groove is opened at one end of the support flap body 1-4 to install the laser hole stage mounting base 1-3. The laser hole stage 3 is installed in the laser hole stage mounting base 1-3 by a buckle or screw. One long side of the support flap body 1-4 is provided with three or more support flap clamping plate spring shafts 1-2. Each support flap clamping plate spring shaft 1-2 is equipped with a support flap unfolding clamping plate 1-1. The other long side of the support flap body 1-4 is provided with a support flap unfolding clamping plate slot 1-5. The position of the support flap unfolding clamping plate slot 1-5 corresponds to the support flap unfolding clamping plate 1-1. The inner surface of the support flap unfolding clamping plate slot 1-5 is provided with a support flap unfolding threaded jack limiting groove 1-6.

[0017] To enable the device for supporting gas drainage boreholes (hereinafter referred to as "the device") to be deployed normally in the borehole, as a further improvement of the present invention, such as... Figure 4As shown, the connecting shaft 4-1 is fixedly connected to one end of the screw 4-2. Two mechanical jacks 4-3 are installed on the screw 4-2, and the two mechanical jacks 4-3 are arranged in a cross shape and respectively connect to the support petal unfolding threaded jack limiting groove 1-6 of their respective support petal 1. In order to enable the device to form a solidified layer between the outer surface of the device and the rock wall by injecting a coagulant after unfolding, as a further improvement of the present invention, the inner surface of the support petal body 1-4 is provided with a coagulant injection hole 1-7. The coagulant can be cement or foam. In order to make the coagulant spray more uniform, as a further improvement of the present invention, the coagulant injection hole 1-7 is connected to the coagulant spray hole on the outside of the support petal body 1-4 through the built-in pipeline of the support petal body 1-4.

[0018] When in use, the device suitable for supporting gas drainage boreholes is installed, and the equipment can be put into operation. Utility model patent CN214660327U discloses a support device for coal seam gas drainage boreholes. This device includes a support body and an elastic support leg mechanism. The elastic support leg mechanism includes at least two legs hinged to the support body. The support body has a receiving groove for accommodating the legs. Each leg has an elastic element for controlling the leg's ejection from the receiving groove to support the borehole, and a check valve component for preventing the leg from retracting back into the receiving groove after ejection. This invention can effectively support the borehole and prevent borehole collapse. This utility model is applicable to use in coal seam gas drainage boreholes for supporting the borehole. Although this application can provide further borehole support, it is still a fixed-diameter support pipe type support device. During installation, it still needs to be supported in place all at once after the borehole is drilled. If borehole collapse occurs, it still needs to be re-drilled, which is time-consuming and labor-intensive. This invention uses an alternating method of drilling and supporting the drill rod after it has been drilled a certain distance, and then drilling and supporting again. This allows the drill bit to continue drilling in the supported borehole, effectively preventing borehole collapse caused by excessively long boreholes and untimely support.

[0019] When in use, this invention works as follows:

[0020] In use, select the side surface to be drilled, drill a hole to the length of this device using a drill rod, then insert one of these devices. Rotate the support flap unfolding threaded jack 4, causing the connecting shaft 4-1 to drive the screw 4-2 to rotate. This allows the two mechanical jacks 4-3 to simultaneously apply pressure to the four support flaps 1, enabling them to unfold. Once the support flaps 1 are fully unfolded, the support flap unfolding clamp 1-1 will spring into the support flap unfolding clamp slot 1-5 under the action of the support flap clamp spring rotating shaft 1-2. At this point, rotate the connecting shaft 4-1 in the opposite direction to disengage the mechanical jacks 4-3 from the support flap unfolding threaded jack limiting groove 1-6, allowing the support flap unfolding threaded jack 4 to be pulled out. Then, the drilling machine continues drilling. After drilling is completed, a new device, due to its smaller diameter... The device can be accessed from the previously deployed support section to enter the borehole section requiring support. A new support petal deployment threaded jack 4 is then rotated, causing the connecting shaft 4-1 to drive the screw 4-2 to rotate. This allows two mechanical jacks 4-3 to simultaneously apply pressure to the four support petals 1, enabling them to deploy. Once the support petals 1 are fully deployed, the support petal deployment plate 1-1 will spring into the support petal deployment plate slot 1-5 under the action of the support petal plate spring shaft 1-2. At this point, the connecting shaft 4-1 is rotated in the opposite direction, causing the mechanical jack 4-3 to disengage from the support petal deployment threaded jack limiting groove 1-6, allowing the support petal deployment threaded jack 4 to be pulled out. This alternating drilling and support operation effectively prevents borehole collapse caused by excessive borehole length and untimely support. After deploying multiple sections of this device, the support petal deployment threaded jack 4 can be controlled via an extended connecting rod.

Claims

1. A device suitable for supporting boreholes in gas drainage, characterized in that, Four support flaps (1) are arranged in a tubular shape, and adjacent support flaps (1) are connected by support flap membranes (2). A laser aperture platform (3) is provided at one end of each support flap (1). A support flap unfolding threaded jack (4) is located at the center of the four tubular support flaps (1). The support flap (1) includes a support flap unfolding clamping plate (1-1), a support flap clamping plate spring shaft (1-2), a laser aperture platform mounting base (1-3), a support flap body (1-4), a support flap unfolding clamping plate slot (1-5), a support flap unfolding threaded jack limiting slot (1-6), and a coagulant injection hole (1-7). A through slot is opened at one end of the support flap body (1-4) to install the laser. The laser hole platform (3) is installed in the laser hole platform mounting base (1-3) by means of a buckle or screw. The support valve body (1-4) has three or more support valve clamping plate spring shafts (1-2) on one long side. Each support valve clamping plate spring shaft (1-2) is equipped with a support valve unfolding clamping plate (1-1). The support valve body (1-4) has a support valve unfolding clamping plate slot (1-5) on the other long side. The position of the support valve unfolding clamping plate slot (1-5) corresponds to the support valve unfolding clamping plate (1-1). The inner surface of the support valve unfolding clamping plate slot (1-5) has a support valve unfolding threaded jack limiting groove (1-6). The support flap unfolding threaded jack (4) includes a connecting shaft (4-1), a screw (4-2), and a mechanical jack (4-3). The connecting shaft (4-1) is fixedly connected to one end of the screw (4-2). Two mechanical jacks (4-3) are installed on the screw (4-2). The two mechanical jacks (4-3) are arranged in a cross shape and respectively connect to the support petal (1) of their respective support petal unfolding threaded jack limit groove (1-6).

2. The device for supporting gas drainage boreholes according to claim 1, characterized in that, The inner surface of the support valve body (1-4) is provided with a coagulant injection hole (1-7).

3. The device for supporting gas drainage boreholes according to claim 2, characterized in that, The coagulant injection hole (1-7) is connected to the coagulant spray hole on the outside of the support valve body (1-4) through the built-in pipeline of the support valve body (1-4).

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