A double hole fishing tool for a general drill

Abstract

The utility model relates to the technical fields of gas extraction drilling construction fishing drill tool, specifically relates to a kind of universal drill double-hole fishing drill tool;Including double-hole fixed connecting ring, drill rod variable diameter joint and drill bit;The double-hole fixed connecting ring includes two sections of steel pipe cover of same diameter and length, and the outer wall between two steel pipe cover is welded together by connecting block, and the central axis of two sections of steel pipe cover is parallel to each other;The inner thread is equipped in the inner wall of drill rod variable diameter joint, one end of drill rod variable diameter joint is used to connect drill bit, and the other end is used to connect fishing drill rod;The drill bit is the conventional drill bit used when universal drill construction;The utility model improves the universal drill press drill fishing success rate, and fishing success rate reaches 100% by far, saves universal drill tool material cost, and reduces the safety risk of planned exposure drill tool in later period roadway excavation and mining, improves the working face excavation and mining efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of drilling tools for gas extraction drilling construction and retrieval, specifically to a conventional double-hole retrieval drilling tool. Background Technology

[0002] During conventional drilling operations, due to the influence of coal seam geological conditions, situations such as borehole collapse and high pressure can easily lead to drill bit capping within the hole. Because the rotary head of a conventional drilling rig cannot be used to retrieve the drill bit, forced removal is necessary after drill bit capping, resulting in a low success rate. After multiple attempts, the drill bit cannot be removed, forcing the retrieval to be abandoned. Failed retrieval not only wastes drilling tools and affects construction efficiency but also poses safety hazards to roadway excavation and face mining. Summary of the Invention

[0003] This utility model addresses the technical problems in the prior art, such as the inability to use a retrieval drill rod for retrieval after in-hole pressure drilling due to the influence of the rotary structure of ordinary drilling rigs, the limitation of retrieval technology, the need for forced handling after pressure drilling, and the low success rate of retrieval. It provides a conventional drilling double-hole retrieval drill tool.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a conventional double-hole fishing drill, including a double-hole fixed connecting ring, a drill rod reducing joint and a drill bit; The double-hole fixed connecting ring includes two steel pipe sleeves with the same diameter and length. The outer walls of the two steel pipe sleeves are welded together by a connecting block, and the central axes of the two steel pipe sleeves are parallel to each other. The inner wall of the drill pipe reducing joint is provided with internal threads. One end of the drill pipe reducing joint is used to connect the drill bit, and the other end is used to connect the retrieval drill pipe. The drill bit in question is a conventional drill bit used in ordinary drilling operations.

[0005] Furthermore, the steel pipe sleeve has a diameter of φ75mm, a wall thickness of 0.5mm, and a length of 70mm.

[0006] Furthermore, the drill pipe reducing joint is a steel pipe with a diameter of φ89mm, a wall thickness of 0.5mm, and a length of 15mm.

[0007] Furthermore, the drill bit is a conventional φ89mm drill bit used in ordinary drilling operations.

[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model improves the success rate of conventional drill bit salvage. By using a dual-hole salvage drill bit, the coal and slag inside the drilled hole can be cleared and discharged, ensuring that the drilled hole is unobstructed or the pressure is reduced, thus guaranteeing the successful salvage of the drill rod. To date, the salvage success rate has reached 100%.

[0009] 2. This utility model saves on the material cost of conventional drilling tools. In the past, when using conventional drilling tools for retrieval, the drilling rig could only be repeatedly pulled and dragged, which greatly increased the risk of the drill falling and resulted in material waste.

[0010] 3. This utility model reduces the manpower and material resources required to supplement ordinary drilling tools.

[0011] 4. This utility model improves salvage efficiency and drilling efficiency.

[0012] 5. This utility model reduces the safety risk of unplanned exposure of drilling tools during later roadway excavation and face mining, and improves the efficiency of working face excavation and mining. Attached Figure Description

[0013] Figure 1 This is a front view of the dual-hole fishing drill assembly of this utility model.

[0014] Figure 2 This is a side view of the dual-hole fishing drill assembly of this utility model.

[0015] Figure 3 This is the front view of the double-hole fixed connecting ring.

[0016] Figure 4 This is a side view of a double-hole fixed connecting ring.

[0017] The markings in the image are as follows: 1. Double-hole fixed connecting ring, 1-1. Steel pipe sleeve, 1-2. Connecting block, 2. Drill rod reducing joint, 3. Drill bit. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments.

[0019] Example like Figure 1 and 2 As shown, a conventional double-hole fishing drill includes a double-hole fixed connecting ring 1, a drill rod reducing joint 2, and a drill bit 3; like Figure 3 and 4 As shown, the double-hole fixed connecting ring 1 includes two steel pipe sleeves 1-1 with the same diameter and length. The outer walls of the two steel pipe sleeves 1-1 are welded together by a connecting block 1-2, and the central axes of the two steel pipe sleeves 1-1 are parallel to each other. The inner wall of the drill pipe reducing joint 2 is provided with internal threads. One end of the drill pipe reducing joint 2 is used to connect the drill bit 3, and the other end is used to connect the fishing drill pipe 4. The drill bit 3 is a conventional drill bit used in ordinary drilling operations.

[0020] Furthermore, the steel pipe sleeve 1-1 has a diameter of φ75mm, a wall thickness of 0.5mm, and a length of 70mm.

[0021] Furthermore, the drill pipe reducing joint 2 is a steel pipe with a diameter of φ89mm, a wall thickness of 0.5mm, and a length of 15mm.

[0022] Furthermore, the drill bit 3 is a conventional φ89mm drill bit used in ordinary drilling operations.

[0023] Working process and principle: such as Figure 1 and 2 As shown, during use, one end of the drill rod reducing connector 2 is connected to the retrieval drill rod 4 (threaded connection), and the other end is connected to the drill bit 3 through a φ75mm*15mm steel pipe (150mm long) (threaded connection). The steel pipe sleeve 1-1 on one side of the double-hole fixed connecting ring 1 is placed between the drill bit 3 and the drill rod reducing connector 2; then the steel pipe sleeve 1-1 on the other side of the double-hole fixed connecting ring 1 is placed on the pressed drill rod 5; then the drilling rig is started to push the retrieval drill rod 4 to rotate and drill, depressurize the coal body around the pressed drill rod 5, flush the borehole slag, and ensure that the borehole channel is unobstructed; then the drilling rig is operated to withdraw the retrieval drill rod 4 and the double-hole retrieval drill tool, and finally the pressed drill rod 5 is withdrawn by the drilling rig, and the retrieval is successful.

[0024] This utility model involves placing a steel pipe sleeve 1-1 on one side of the double-hole retrieval drill bit between the drill rod reducing joint 2 and the drill bit 3, and a circular ring on the other side on the pressed drill rod 5. When the drilling rig pushes the retrieval drill rod, the double-hole retrieval drill bit can depressurize the coal body around the pressed drill rod 5 along the pressed drill rod 5 and flush away coal slag to clear the borehole channel, thereby achieving the purpose of removing the pressed drill rod 5.

Claims

1. A conventional double-hole fishing drill tool, characterized in that, Includes a double-hole fixed connecting ring (1), a drill pipe reducing joint (2), and a drill bit (3); The double-hole fixed connecting ring (1) includes two steel pipe sleeves (1-1) with the same diameter and length. The outer walls of the two steel pipe sleeves (1-1) are welded together by a connecting block (1-2), and the central axes of the two steel pipe sleeves (1-1) are parallel to each other. The inner wall of the drill pipe reducing joint (2) is provided with internal threads. One end of the drill pipe reducing joint (2) is used to connect the drill bit (3), and the other end is used to connect the fishing drill pipe (4). The drill bit (3) is the drill bit used in conventional drilling operations.

2. The conventional drilling tool for dual-hole fishing as described in claim 1, characterized in that, The steel pipe sleeve (1-1) has a diameter of φ75mm, a wall thickness of 0.5mm, and a length of 70mm.

3. The conventional drilling tool for dual-hole fishing according to claim 1, characterized in that, The drill pipe reducing joint (2) is a steel pipe with a diameter of φ89mm, a wall thickness of 0.5mm, and a length of 15mm.

4. The conventional drilling tool for dual-hole fishing as described in claim 1, characterized in that, The drill bit (3) is an 89mm drill bit used in conventional drilling operations.

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