Directional drilling, milling, fishing and synchronous shackle and drill withdrawal technology in coal mines

Abstract

The present invention belongs to the field of coal mine safety technology and relates to a process for directional drilling, casing, milling, salvaging and synchronous shattering and drill withdrawal in coal mines. The process comprises the following steps: after casing and milling a salvage drill rod, drilling to a drill stuck position of the directional drill rod, removing the water braid at the tail end of the salvage drill rod, inserting a directional drill rod and tightening the thread; installing a synchronous drill withdrawal device on the directional drill rod and arranging the synchronous drill withdrawal device adjacent to the tail end of the salvage drill rod; using a drill power head in a directional drilling rig to clamp the salvage drill rod, retracting the drill power head to make the salvage drill rod withdraw from the borehole, and simultaneously the synchronous drill withdrawal device drives the directional drill rod to withdraw synchronously; when the threaded connection of the salvage drill rod is between the drill power head and a clamp, stopping retraction and removing the synchronous drill withdrawal device; clamping the drill clamp, reversing the drill power head to disassemble the threaded connection of the salvage drill rod; disassembling the shattered salvage drill rod and the directional drill rod; and repeating the above steps until all directional drilling tools and salvage drill rods are withdrawn.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine safety, and relates to a process for directional drilling, casing milling, fishing and synchronous shackle and drill withdrawal in underground coal mines. Background Art

[0002] Directional drilling is a crucial process in underground coal mines, widely used in resource exploration, geological surveys, and mine construction. However, drill sticking accidents often occur during actual operations, seriously impacting construction progress and potentially damaging expensive directional drilling tools, further increasing operational costs.

[0003] At present, the salvage operation for stuck drill pipe accidents in directional drilling in coal mines in China basically follows a fixed process: first, the slips on the drilling rig need to be replaced with salvage slips specially used for salvage, so as to clamp and operate the salvage drill pipe; then, the salvage drill pipe is drilled to the stuck drill accident point through rotary drilling to try to unstuck the directional drill tool; once the unstuck is successful, the salvage drill pipe needs to be withdrawn; finally, the slips are replaced again to withdraw the unstuck directional drill tool.

[0004] While this process can address the stuck drill problem to a certain extent, its drawbacks should not be ignored. First, the entire process is relatively complex, requiring multiple slip replacements and drill pipe advances and retreats, resulting in low construction efficiency. Second, during the process of withdrawing and salvaging the drill pipe, the directional drill tool at the original stuck drill position is at risk of becoming stuck again. This could not only exacerbate damage to the drill tool but also trigger new safety incidents, posing a threat to the safety of construction workers.

[0005] Furthermore, the process requires two drill-back operations to remove the more valuable directional drilling tool from the hole, which not only increases operation time but also risks further damage or loss of the tool due to improper operation. Therefore, existing salvage operation technology cannot meet the comprehensive requirements of safety, efficiency, and economy for directional drilling operations in underground coal mines.

[0006] In summary, existing technologies for recovering stuck drill bits in underground directional drilling (DDD) in coal mines suffer from complex processes, low efficiency, a high risk of secondary drill sticking, and significant risk of damage or loss of drill tools. Therefore, it is necessary to develop a new recovery technology or device to simplify the process, improve efficiency, reduce the risk of secondary drill sticking, and better protect directional drill tools, thereby meeting the requirements for safe and efficient DDD operations in underground coal mines. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a coal mine underground directional drilling milling salvage synchronous shackle drill withdrawal process to achieve the synchronous drill withdrawal of the salvage drill rod and the directional drill rod, improve construction efficiency and reduce the risk of secondary drill sticking.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A directional drilling, casing, milling, fishing and synchronous shackle and drill withdrawal process in a coal mine comprises the following steps:

[0010] Step 1. After milling the salvage drill pipe, use a directional drill rig to drill to the directional drill pipe stuck position, then remove the water braid at the tail end of the salvage drill pipe and insert a directional drill pipe into the tail end of the salvage drill pipe. Manually tighten the directional drill pipe thread so that the tail end of the directional drill pipe passes through the salvage drill pipe.

[0011] Step 2. Install a synchronous drill withdrawal device at the tail end of the directional drill pipe, and arrange the synchronous drill withdrawal device adjacent to the tail end of the salvage drill pipe to withstand the axial force of the salvage drill pipe;

[0012] Step 3. Use the drill head in the directional drill to clamp the salvage drill rod, release the drill clamp, and retract the drill head to withdraw the salvage drill rod from the borehole. At the same time, the synchronous drill withdrawal device bears the axial force from the salvage drill rod, driving the directional drill rod to withdraw synchronously.

[0013] Step 4. When the threaded connection of the salvage drill pipe is between the drill head and the clamp, stop retreating and remove the synchronized drill retraction device;

[0014] Step 5. Clamp the drill rig holder, reverse the drill rig power head and remove the salvage drill pipe thread connection;

[0015] Step 6. Remove the shackled salvage drill pipe to expose the threads of the directional drill pipe, remove the threads of the directional drill pipe, and then remove the shackled directional drill pipe;

[0016] Step 7. Repeat steps 2-6 until all directional drilling tools and salvage drill pipes are withdrawn.

[0017] Furthermore, in step 6, the directional drill pipe thread is removed by an automatic breaking device.

[0018] Furthermore, the outer diameter of the synchronous drill withdrawal device is larger than the inner diameter of the salvage drill rod, so as to form an axial limit with the salvage drill rod when the salvage drill rod makes an axial displacement, transmit the axial force and drive the directional drill rod to be synchronously withdrawn.

[0019] Furthermore, the synchronous drill withdrawal device is fixedly mounted on the directional drill rod by means of bolts.

[0020] Furthermore, the synchronous drill retraction device is sleeved on the directional drill rod and clamps the directional drill rod when subjected to the axial force of the salvaged drill rod.

[0021] The beneficial effects of the present invention are:

[0022] 1. Simplify the process flow and improve construction efficiency: The invention adopts a coal mine underground directional drilling, milling and salvage synchronous shackle and drill withdrawal process, which significantly simplifies the construction process flow of directional drilling, milling and salvage operations in coal mines, reduces the operation steps and the required time, and significantly improves the construction efficiency of the salvage operation, reducing the delays caused by multiple replacement of slips and advance and retreat drill rods in traditional processes.

[0023] 2. Reduce the risk of secondary drill sticking: The present invention reduces the risk of secondary drill sticking of the directional drilling tool during the process of withdrawing the salvage drill pipe, thereby reducing the possibility of drill tool damage and safety accidents.

[0024] 3. Enhance operational safety and improve economic benefits: By optimizing the process flow and reducing the number of operating steps, the present invention improves the overall safety of directional drilling operations in underground coal mines and provides a better working environment for construction personnel. By simplifying the process flow, improving construction efficiency and reducing the risk of secondary drill sticking, the present invention helps to reduce the cost of salvage operations and improve the economic benefits of coal mining enterprises.

[0025] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0027] Figure 1 It is a flow chart of a directional drilling, casing, milling, fishing and synchronous shackle and drill withdrawal process in coal mines;

[0028] Figure 2 This is a structural principle diagram of a directional drilling, casing, milling, fishing and synchronous shackle and drill withdrawal process in underground coal mines.

[0029] Figure numerals: 1-directional drill pipe; 2-automatic breakout device; 3-synchronous drill retraction device; 4-fishing drill pipe; 5-drilling rig operating table; 6-drilling rig power head; 7-drilling rig clamp; 8-directional drilling rig. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] See also Figures 1 and 2 , is a coal mine underground directional drilling milling fishing synchronous shackle drill withdrawal process, specifically including the following steps:

[0034] Step 1. After the salvage drill rod 4 is milled, the directional drill rig 8 is used to drill to the directional drill rod stuck position. The water braid at the tail end of the salvage drill rod is then removed, and a directional drill rod 1 is inserted into the tail end of the salvage drill rod. The directional drill rod thread is manually tightened so that the tail end of the directional drill rod passes through the salvage drill rod, allowing the synchronous drill withdrawal device 3 to be installed on the directional drill rod 1.

[0035] Step 2. Install the synchronous drill withdrawal device 3 on the directional drill pipe 1, and arrange the synchronous drill withdrawal device 3 adjacent to the tail end of the salvage drill pipe to withstand the axial force of the salvage drill pipe 4;

[0036] Step 3. The drilling head 6 in the directional drilling rig 8 clamps the salvage drill rod 4, releases the drilling rig clamp 7, and retracts the drilling head 6, causing the salvage drill rod 4 to exit the borehole. Simultaneously, the salvage drill rod 4 contacts the synchronous drill withdrawal device 3, so that the synchronous drill withdrawal device 3 is subjected to the axial force from the salvage drill rod 4. After receiving the axial force, the synchronous drill withdrawal device 3 clamps the directional drill rod 1 and drives the directional drill rod 1 to exit the borehole, causing the directional drill rod 1 and the salvage drill rod 4 to retract synchronously.

[0037] Step 4. When the threaded connection of the salvage drill pipe 4 is located between the drilling rig power head 6 and the clamp 7, stop retracting the drilling rig power head 6 and remove the synchronous drill retraction device 3;

[0038] Step 5. Clamp the drill rig holder 7, reverse the drill rig power head 6 and remove the threaded connection of the salvage drill pipe;

[0039] Step 6. Dismantle the salvage drill pipe 4 that has been shackled. Use the automatic shackle device 2 to remove the threads of the directional drill pipe 1, and then dismantle the directional drill pipe 1 that has been shackled.

[0040] Step 7. Repeat steps 2-6 until all directional drilling tools and salvage drill pipe 4 are withdrawn.

[0041] Specifically, the directional drilling rig 8 includes a drilling rig power head 6, a drilling rig clamp 7, a power system, and a drilling rig operating console 5 for controlling the drilling rig power head 6, the drilling rig clamp 7, and the power system.

[0042] Specifically, the outer diameter of the synchronous drill withdrawal device 3 is larger than the inner diameter of the salvage drill rod 4, so that when the salvage drill rod 4 makes axial displacement, it forms an axial limit with the synchronous drill withdrawal device 3 to transmit axial force and clamp the directional drill rod 1, while driving the synchronous drill withdrawal device 3 to make axial displacement, and then driving the directional drill rod 1 to be synchronously withdrawn.

[0043] During directional drilling and milling salvage operations, the automatic breakout device 2 is connected to the directional drilling rig's power system to obtain power. During breakout, the directional drilling rig removes the threads of the salvage drill rod 4, and the automatic breakout device 2 simultaneously removes the threads of the directional drill rod. During drill withdrawal, the directional drilling rig clamps the salvage drill rod and withdraws it, while simultaneously transmitting the pulling force to the directional drill rod 1 via the synchronous drill withdrawal device 3. The synchronous drill withdrawal device 3 clamps the directional drill rod 1 and withdraws the directional drill rod synchronously. After a set of drilling tools is removed, the above operation is repeated until all drilling tools are out of the hole.

[0044] In other embodiments, other devices capable of disassembling the drill rod thread may be used instead of the automatic unbuckling device 2 to disassemble the directional drill rod thread; similarly, the synchronous drill withdrawal device 3 may be configured to be fixedly installed on the directional drill rod 1 by bolts or other fixed mounting parts, so as to replace the structural form of the directional drill rod 1 that is clamped after bearing the axial force in the above-mentioned embodiment.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A coal mine underground directional drilling milling fishing synchronous shackle drill withdrawal process, characterized in that: The following steps are involved: Step 1. After milling the salvage drill pipe, use a directional drill rig to drill to the directional drill pipe stuck position, then remove the water braid at the tail end of the salvage drill pipe and insert a directional drill pipe into the tail end of the salvage drill pipe. Manually tighten the directional drill pipe thread so that the tail end of the directional drill pipe passes through the salvage drill pipe. Step 2. Install a synchronous drill withdrawal device at the tail end of the directional drill pipe, and arrange the synchronous drill withdrawal device adjacent to the tail end of the salvage drill pipe to withstand the axial force of the salvage drill pipe; Step 3. Use the drill head in the directional drill to clamp the salvage drill rod, release the drill clamp, and retract the drill head to withdraw the salvage drill rod from the borehole. At the same time, the synchronous drill withdrawal device bears the axial force from the salvage drill rod, driving the directional drill rod to withdraw synchronously. Step 4. When the threaded connection of the salvage drill pipe is between the drill head and the clamp, stop retreating and remove the synchronized drill retraction device; Step 5. Clamp the drill rig holder, reverse the drill rig power head and remove the salvage drill pipe thread connection; Step 6. Remove the shackled salvage drill pipe to expose the threads of the directional drill pipe, remove the threads of the directional drill pipe, and then remove the shackled directional drill pipe; Step 7. Repeat steps 2-6 until all directional drilling tools and salvage drill pipes are withdrawn; The outer diameter of the synchronous drill withdrawal device is larger than the inner diameter of the salvage drill rod, so as to form an axial limit with the salvage drill rod when the salvage drill rod makes an axial displacement, transmit the axial force and drive the directional drill rod to be synchronously withdrawn.

2. The coal mine underground directional drilling, casing, milling, fishing and synchronous shackle and drill withdrawal process according to claim 1 is characterized in that: In step 6, the directional drill pipe threads are removed by an automatic breakout device.

3. The coal mine directional drilling, casing, milling, fishing and synchronous shackle and drill withdrawal process according to claim 1 is characterized in that: The synchronous drill withdrawal device is fixedly mounted on the directional drill rod by means of bolts.

4. The coal mine underground directional drilling, casing, milling, fishing and synchronous shackle and drill withdrawal process according to claim 1 is characterized in that: The synchronous drill retraction device is sleeved on the directional drill rod and clamps the directional drill rod after receiving the axial force of the salvaged drill rod.

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