Fishing tool for handling accidents in directional long drill hole

Abstract

The utility model discloses an accident handling and fishing tool in a directional long drill hole, which relates to the field of underground coal mine drilling and comprises a male buckle fisher, a female buckle fisher, a male cone fisher, a female cone fisher and a casing milling drilling tool. The male buckle fisher, the female buckle fisher, the male cone fisher and the female cone fisher can be installed on a drill rod, and the male buckle fisher and the female buckle fisher can be connected with drilling tools with the buckle types of a male buckle and a female buckle in a buckled mode respectively. The male tap fisher and the female tap fisher can be used for turning internal threads and external threads on a drilling tool respectively and are connected with the drilling tool in a buckling manner; the casing milling drilling tool can be installed on a drilling machine and arranged on the periphery of a buried drill rod in a sleeving mode, and the die tap fisher can penetrate through an inner cavity of the casing milling drilling tool. The utility model has the advantage that the success rate of fishing the drilling tool in the directional long drill hole is improved.

Description

Technical Field

[0001] The utility model relates to the field of underground coal mine drilling, in particular to a fishing tool for dealing with downhole accidents in directional long boreholes. Background Technique

[0002] During the construction of underground boreholes, common downhole accidents include drill breakage, drill burial, and thread disengagement. Compared with ordinary boreholes, it is more difficult to handle downhole accidents in directional long boreholes, and the resulting economic losses are also heavier. Therefore, after downhole accidents such as drill breakage, drill burial, and thread disengagement occur, fishing tools are required to fish for the drill string. Conventional fishing tools include female tap and male tap, but for various downhole accidents in directional long boreholes, it is difficult to successfully fish for the drill string only with conventional female tap and male tap. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to improve the success rate of fishing for the drill string in the directional long borehole.

[0004] The utility model solves the above technical problem by the following technical means: A fishing tool for dealing with downhole accidents in directional long boreholes, including a male-thread fishing device, a female-thread fishing device, a male-tap fishing device, a female-tap fishing device, and a milling tool; the male-thread fishing device, the female-thread fishing device, the male-tap fishing device, and the female-tap fishing device can all be installed on the drill pipe. The male-thread fishing device and the female-thread fishing device can respectively connect with drill strings with male threads and female threads by threading. The male-tap fishing device and the female-tap fishing device can respectively thread internal threads and external threads on the drill string and connect with it by threading; the milling tool can be installed on the drilling rig and sleeved on the outer periphery of the buried drill pipe, and the male-tap fishing device can pass through the inner cavity of the milling tool. One or more fishing tools can be selected and used in combination according to the type of downhole accident, the type of drill string, geological conditions, etc., to realize the fishing of drill strings for various downhole accidents such as the thread disengagement accident with intact threads at the fish landing point, the drill breakage accident with no intact threads at the fish landing point and a small borehole diameter, the drill breakage accident with no intact threads at the fish landing point, a large borehole diameter and a small inner diameter of the drill string, the drill burial accident, and the drill breakage accident caused by sticking drill, etc., improving the success rate of fishing for the drill string in the directional long borehole.

[0005] As an optimized technical solution, the male-thread fishing device includes a male-thread fishing device sleeve and a male-thread threading device. One end of the male-thread fishing device sleeve is provided with a male-thread fishing device inlet in the shape of an inclined bell mouth. The male-thread fishing device sleeve is fixedly connected to the outer periphery of the male-thread threading device. One end of the male-thread threading device located inside the male-thread fishing device sleeve is provided with an external thread for threading connection with the drill string at the fish landing point. The male-thread fishing device sleeve is used to correct the attitude of the drill string at the fish landing point and improve the docking success rate.

[0006] As an optimized technical solution, the female thread fishing tool includes a female thread fishing tool sleeve and a female thread coupling device. One end of the female thread fishing tool sleeve is provided with a female thread fishing tool inlet in the shape of an inclined bell mouth. The female thread fishing tool sleeve is fixedly connected to the outer periphery of the female thread coupling device. One end of the female thread coupling device located inside the female thread fishing tool sleeve is provided with an internal thread for coupling and connecting with the drill pipe at the fish drop point. The female thread fishing tool sleeve is used to correct the attitude of the drill pipe at the fish drop point and improve the docking success rate.

[0007] As an optimized technical solution, the male taper fishing tool includes a male taper fishing tool sleeve and a male taper. One end of the male taper fishing tool sleeve is provided with a male taper fishing tool inlet in the shape of an inclined bell mouth. The male taper fishing tool sleeve is fixedly connected to the outer periphery of the male taper. The outer periphery of one end of the male taper located inside the male taper fishing tool sleeve is provided with a male taper thread for threading internal threads. The male taper fishing tool sleeve is sleeved outside the drill pipe at the fish drop point, which can prevent the drill pipe at the fish drop point from being cracked during the threading process.

[0008] As an optimized technical solution, the female taper fishing tool includes a female taper fishing tool sleeve and a female taper. One end of the female taper fishing tool sleeve is provided with a female taper fishing tool inlet in the shape of an inclined bell mouth. The female taper fishing tool sleeve is fixedly connected to the outer periphery of the female taper. The inner periphery of one end of the female taper located inside the female taper fishing tool sleeve is provided with a female taper thread for threading external threads. The female taper fishing tool sleeve is used to correct the attitude of the drill pipe at the fish drop point and improve the docking success rate.

[0009] As an optimized technical solution, the female taper fishing tool sleeve is a multi-stage stepped structure, and its inner diameter gradually decreases from the female taper fishing tool inlet end to the other end opposite thereto. The more the number of stages, the higher the docking success rate.

[0010] As an optimized technical solution, the female taper fishing tool inlet end of the female taper fishing tool sleeve is provided with a spoon structure. In the case where the drilling hole diameter is large and the attitude of the drill pipe at the fish drop point is not correct, and it is still difficult to successfully dock using the female taper fishing tool sleeve, the spoon structure can be added to improve the docking success rate.

[0011] As an optimized technical solution, the male thread fishing tool, the female thread fishing tool, the male taper fishing tool, and the female taper fishing tool are all provided with internal threads for coupling and connecting with the drill pipe on the drilling rig. It is convenient to connect with the drill pipe on the drilling rig.

[0012] As an optimized technical solution, the milling drill tool includes a milling bit, a milling drill pipe, and a reducing joint. The milling drill pipe is a hollow drill pipe with an inner diameter larger than the outer diameter of the buried drill tool. The milling bit is installed at one end of the milling drill pipe that enters the borehole, and one end of the milling drill pipe located outside the borehole can be connected to the buried drill tool through the reducing joint. The milling drill pipe can be installed on the drilling rig for drilling. Every time a certain distance is drilled, the milling drill pipe can be removed from the drilling rig and connected to the buried drill tool through the reducing joint, and an attempt is made to rotate and pull the buried drill tool through the milling drill pipe. If the buried drill tool still cannot be moved, continue milling and drilling until the buried drill tool can be rotated and pulled, indicating that the "unjamming" is successful.

[0013] As an optimized technical solution, the male thread fishing tool, the female thread fishing tool, the male taper fishing tool, the female taper fishing tool, and the milling drill tool all have channels running through both ends. To improve the docking success rate of the fishing tools, a visual fishing process is generally required with the aid of a borescope, and the channels can ensure the passage of the borescope.

[0014] The advantages of the present utility model are as follows: One or more fishing tools can be selected and used in combination according to the type of accident in the borehole, the type of drill tool, the geological conditions, etc., to achieve the fishing of drill tools for various accidents in the borehole, such as the thread release accident where the thread of the drill tool at the fish landing point is intact, the broken drill accident where the drill tool at the fish landing point has no intact thread and the borehole diameter is small, the broken drill accident where the drill tool at the fish landing point has no intact thread, the borehole diameter is large and the inner diameter of the drill tool is small, the buried drill accident, and the broken drill accident caused by sticking of the drill, etc., improving the success rate of fishing drill tools in directional long boreholes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the male thread fishing tool in the first embodiment of the present utility model.

[0016] Figure 2 is a schematic structural diagram of the female thread fishing tool in the first embodiment of the present utility model.

[0017] Figure 3 is a schematic structural diagram of the male taper fishing tool in the first embodiment of the present utility model.

[0018] Figure 4 is a schematic structural diagram of the female taper fishing tool in the first embodiment of the present utility model.

[0019] Figure 5 is a schematic structural diagram of the milling drill tool in the first embodiment of the present utility model.

[0020] Figure 6 is a schematic structural diagram of the female taper fishing tool in the second embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment 1

[0023] As Figures 1 to 5 shown, this embodiment discloses a fishing tool for dealing with downhole accidents in directional long boreholes, including a male-thread fishing tool 1, a female-thread fishing tool 2, a male taper fishing tool 3, a female taper fishing tool 4, and a milling tool 5.

[0024] The male-thread fishing tool 1, the female-thread fishing tool 2, the male taper fishing tool 3, and the female taper fishing tool 4 can all be installed on the drill pipe. The male-thread fishing tool 1 and the female-thread fishing tool 2 can respectively be connected by butt-joint with drill tools with male threads and female threads. The male taper fishing tool 3 and the female taper fishing tool 4 can respectively cut internal threads and external threads on the drill tool and be connected with it by butt-joint. The milling tool 5 can be installed on the drilling rig and sleeved on the outer periphery of the buried drill tool 6. One or more fishing tools can be selected and used in combination according to the type of downhole accident, the type of drill tool, geological conditions, etc., to improve the success rate of fishing drill tools in directional long boreholes.

[0025] As Figure 1 shown, the male-thread fishing tool 1 includes a male-thread fishing tool sleeve 11 and a male-thread butt-joint device 12; the male-thread fishing tool sleeve 11 can be sleeved on the drill tool at the fish-fall point. One end of the male-thread fishing tool sleeve 11 is provided with a male-thread fishing tool inlet in the shape of an inclined flared opening. The male-thread fishing tool sleeve 11 is fixedly connected to the outer periphery of the male-thread butt-joint device 12; one end of the male-thread butt-joint device 12 located inside the male-thread fishing tool sleeve 11 is provided with an external thread for butt-joint connection with the drill tool at the fish-fall point, and one end of the male-thread butt-joint device 12 located outside the male-thread fishing tool sleeve 11 is provided with an internal thread for butt-joint connection with the drill pipe on the drilling rig.

[0026] As Figure 2 shown, the female-thread fishing tool 2 includes a female-thread fishing tool sleeve 21 and a female-thread butt-joint device 22; the female-thread fishing tool sleeve 21 can be sleeved on the drill tool at the fish-fall point. One end of the female-thread fishing tool sleeve 21 is provided with a female-thread fishing tool inlet in the shape of an inclined flared opening. The female-thread fishing tool sleeve 21 is fixedly connected to the outer periphery of the female-thread butt-joint device 22; one end of the female-thread butt-joint device 22 located inside the female-thread fishing tool sleeve 21 is provided with an internal thread for butt-joint connection with the drill tool at the fish-fall point, and one end of the female-thread butt-joint device 22 located outside the female-thread fishing tool sleeve 21 is provided with an internal thread for butt-joint connection with the drill pipe on the drilling rig.

[0027] Application scenarios of male thread fishing tool 1 and female thread fishing tool 2: For the tripping accident where the tool joint of the fish at the fish drop point is intact, the male thread fishing tool 1 or the female thread fishing tool 2 can be selected according to the tool joint type of the fish at the fish drop point and installed on the drill pipe of the drilling rig. By drilling with the drilling rig, the male thread coupling device 12 or the female thread coupling device 22 is coupled with the fish at the fish drop point, and then the fish at the fish drop point is lifted by pulling out the drill string; the male thread fishing tool sleeve 11 or the female thread fishing tool sleeve 21 is used to correct the attitude of the fish at the fish drop point and improve the docking success rate.

[0028] As Figure 3 shown, the taper tap fishing tool 3 includes a taper tap fishing tool sleeve 31 and a taper tap 32; the taper tap fishing tool sleeve 31 is used to sleeve outside the fish at the fish drop point. One end of the taper tap fishing tool sleeve 31 is provided with a male taper tap fishing tool inlet in the shape of an inclined bell mouth. The taper tap fishing tool sleeve 31 is fixedly connected to the outer circumference of the taper tap 32; on the outer circumference of one end of the taper tap 32 located inside the taper tap fishing tool sleeve 31, there is a taper tap thread for threading internal threads, and on one end of the taper tap 32 located outside the taper tap fishing tool sleeve 31, there is an internal thread for coupling with the drill pipe on the drilling rig.

[0029] Application scenarios of the taper tap fishing tool 3: For the broken drill accident where the fish at the fish drop point has no intact thread and the borehole diameter is small, such as the broken drill accident of a Φ89mm drill pipe in a Φ120mm borehole. Due to the limitation of the borehole diameter, it is not convenient to thread external threads on the fish at the fish drop point, and its internal threads can be fished; the taper tap fishing tool 3 is installed on the drill pipe of the drilling rig. By drilling with the drilling rig, the taper tap 32 threads internal threads on the fish at the fish drop point forcefully and couples with it, and then the fish at the fish drop point is lifted by pulling out the drill string; the taper tap fishing tool sleeve 31 is sleeved outside the fish at the fish drop point, which can prevent the fish at the fish drop point from being cracked during the threading process.

[0030] As Figure 4 shown, the female taper tap fishing tool 4 includes a female taper tap fishing tool sleeve 41 and a female taper tap 42; the female taper tap fishing tool sleeve 41 is used to sleeve outside the fish at the fish drop point. One end of the female taper tap fishing tool sleeve 41 is provided with a female taper tap fishing tool inlet in the shape of an inclined bell mouth. The female taper tap fishing tool sleeve 41 is fixedly connected to the outer circumference of the female taper tap 42; the female taper tap fishing tool sleeve 41 is a multi-stage stepped structure, and its inner diameter gradually decreases from the end of the female taper tap fishing tool inlet to the other end opposite to it. The more the number of stages, the higher the docking success rate; on the inner circumference of one end of the female taper tap 42 located inside the female taper tap fishing tool sleeve 41, there is a female taper tap thread for threading external threads, and on one end of the female taper tap 42 located outside the female taper tap fishing tool sleeve 41, there is an internal thread for coupling with the drill pipe on the drilling rig.

[0031] Application scenario of the female taper fishing tool 4: In case of a broken drill accident where the drill pipe at the fish landing point has no intact thread, the borehole diameter is large while the inner diameter of the drill pipe is small. For example, in the case of a broken drill accident of a Φ82mm drill pipe in a Φ153mm borehole, due to the limitation of the inner diameter of the drill pipe, it is not convenient to cut internal threads on the drill pipe at the fish landing point. Instead, the external threads can be cut and fished. Install the female taper fishing tool 4 on the drill pipe of the drilling rig. Through the drilling of the rig, the female taper 42 forcibly cuts external threads on the drill pipe at the fish landing point and couples with it, and then pull out the drill pipe at the fish landing point by hoisting. The sleeve 41 of the female taper fishing tool is used to correct the attitude of the drill pipe at the fish landing point and improve the docking success rate. For a Φ82mm drill pipe and a Φ153mm borehole, the maximum outer diameter of the sleeve 41 of the female taper fishing tool can be selected as Φ153mm, and the outer diameter of the female taper 42 can be selected as Φ94mm.

[0032] As Figure 5 shown in the figure, the milling tool 5 includes a milling bit, milling drill pipes, and a reducer joint. The milling drill pipes are hollow drill pipes with an inner diameter larger than the outer diameter of the buried drill pipe 6. The milling bit is installed at one end of the milling drill pipe entering the borehole. One end of the milling drill pipe outside the borehole can be connected to the buried drill pipe 6 through a reducer joint. The buried drill pipe 6 is generally a drill pipe with a diameter of Ф89mm, Ф82mm, or Ф73mm. The commonly used specifications of the milling drill pipes are two types: Ф114 / 108 - 93mm milling drill pipes (with spiral grooves) and Ф127 - 103mm milling drill pipes (external flush). The former is mainly used for fishing Ф82mm or Ф73mm drill pipes, and the latter is mainly used for fishing Ф89mm drill pipes.

[0033] Application scenario of the milling tool 5: In case of a buried drill accident, the milling tool 5 can be installed on the drilling rig. The rig drives the milling tool 5 to drill along the original hole trajectory with the buried drill pipe 6 as the guide, expand the borehole diameter, "unstick" the buried drill pipe 6, and then first pull out the milling tool 5 and then the buried drill pipe 6.

[0034] The specific technological operation process is as follows:

[0035] S1 Remove the buried drill pipe 6 from the drilling rig, ensure that the drill pipe tail of the buried drill pipe 6 is located between the roadway side and the front gripper of the rig, and there is a distance of 300 - 500mm between it and the front gripper of the rig. Remove facilities such as the blowout preventer cover of the orifice dust collector that affect the installation space and the passage of the milling bit.

[0036] S2 Replace the chuck jaws and gripper jaws of the rig with chuck jaws and gripper jaws that match the size of the milling drill pipes, realign the hole position, and stabilize the rig.

[0037] S3 Pass the milling drill pipes through the through holes of the rig power head and the gripper, and install the milling bit on the milling drill pipes.

[0038] Carry out milling and drilling with the S4 set. During this process, air pressure should be maintained throughout the drilling, and the drilling speed should be controlled at 6 - 8 m per hour. The drilling speed and slag discharge time should be controlled according to the degree of bending of the original hole trajectory, the rotary pressure of the drill rig, etc.

[0039] When drilling about 50 m (the specific spacing is determined according to parameters such as the total hole depth and drilling pressure), remove the milling drill pipe from the drill rig and connect it to the buried drill tool 6 through a reducer joint. Try to rotate and pull the buried drill tool 6 through the milling drill pipe. If the buried drill tool 6 still cannot be moved, continue milling and drilling until the buried drill tool 6 can be rotated and pulled, indicating successful "unjamming".

[0040] Use the drill rig to lift out the milling drill tool 5.

[0041] Replace the chuck jaws and the gripper jaws of the drill rig with chuck jaws and gripper jaws that match the size of the buried drill tool 6. Re-stabilize the drill rig and use the drill rig to lift out the buried drill tool 6, and the milling and fishing operation is completed.

[0042] Application scenario of the combined fishing method: For the drill breakage accident caused by sticking, since the drill tool at the fish landing point is buried by the surrounding rock, it is difficult to fish simply using the male taper fishing tool 3 or the female taper fishing tool 4. The male taper fishing tool 3 and the milling drill tool 5 can be used in combination for fishing. The male taper fishing tool 3 can pass through the inner cavity of the milling drill pipe. First, use the milling drill tool 5 to "unjam" and relieve the pressure on the drill tool at the fish landing point, and then lower the male taper fishing tool 3 into the inner cavity of the milling drill pipe to thread and fish the drill tool at the fish landing point.

[0043] In addition, to improve the docking success rate of the fishing tools, a visual fishing process is generally required with the aid of a borescope. Therefore, the male thread fishing tool 1, the female thread fishing tool 2, the male taper fishing tool 3, the female taper fishing tool 4, and the milling drill tool 5 all have channels running through both ends, and the minimum inner diameter of the channels is greater than 28 mm to ensure the passage of the borescope.

[0044] Embodiment 2

[0045] As Figure 6 shown, the difference between this embodiment and Embodiment 1 is that a spoon structure 43 is provided at the female taper fishing tool inlet end of the female taper fishing tool sleeve 41. The spoon structure 43 is used to dig the drill tool at the fish landing point into the female taper fishing tool sleeve 41. When it is still difficult to successfully dock using the female taper fishing tool sleeve 41 for the case of a larger drilling hole diameter and an incorrect posture of the drill tool at the fish landing point, the spoon structure 43 can be added to improve the docking success rate.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A salvage tool for handling accidents in directional long boreholes, characterized by: It comprises a male buckle salvage, a female buckle salvage, a male cone salvage, a female cone salvage and a sleeve milling drill tool; the male buckle salvage, the female buckle salvage, the male cone salvage and the female cone salvage can all be installed on a drill pipe, the male buckle salvage and the female buckle salvage can respectively be connected to the drill tools with male buckle and female buckle buckle types, the male cone salvage and the female cone salvage can respectively thread the internal thread and the external thread on the drill tool and be connected to the same; the sleeve milling drill tool comprises a sleeve milling drill bit and a sleeve milling drill pipe, the sleeve milling drill pipe adopts a hollow drill pipe with an inner diameter larger than the outer diameter of the buried drill tool, the sleeve milling drill bit is installed at one end of the sleeve milling drill pipe entering the borehole; the sleeve milling drill tool can be installed on a drilling rig and sleeved on the outer periphery of the buried drill pipe, and the male cone salvage can pass through the inner cavity of the sleeve milling drill tool.

2. The directional long borehole accident handling salvage tool according to claim 1 is characterized by: The male buckle salvage device comprises a male buckle salvage device sleeve and a male buckle interlocking device, one end of the male buckle salvage device sleeve is provided with an oblique trumpet-shaped male buckle salvage device inlet, the male buckle salvage device sleeve is fixedly connected to the outer periphery of the male buckle interlocking device, and one end of the male buckle interlocking device located inside the male buckle salvage device sleeve is provided with an external thread for interlocking connection with a drilling tool at a fish landing point.

3. The directional long borehole accident handling salvage tool according to claim 1 is characterized by: The box buckle salvage device comprises a box buckle salvage device sleeve and a box buckle fastening device, one end of the box buckle salvage device sleeve is provided with an oblique trumpet-shaped box buckle salvage device inlet, the box buckle salvage device sleeve is fixedly connected to the outer periphery of the box buckle fastening device, and one end of the box buckle fastening device located inside the box buckle salvage device sleeve is provided with an internal thread for fastening connection with a drilling tool at a fish landing point.

4. The directional long borehole accident handling salvage tool according to claim 1, characterized in that: The male cone salvage device comprises a male cone salvage device sleeve and a male cone. An oblique trumpet-shaped male cone salvage device inlet is provided at one end of the male cone salvage device sleeve. The male cone salvage device sleeve is fixedly connected to the outer periphery of the male cone. A male cone thread for threading an internal thread is provided at the outer periphery of one end of the male cone located inside the male cone salvage device sleeve.

5. The directional long borehole accident handling salvage tool according to claim 1, characterized in that: The male buckle salvage device, the female buckle salvage device, the male cone salvage device and the female cone salvage device are all provided with internal threads for being connected with the drill rod on the drilling rig.

6. The salvage tool for handling accidents in directional long boreholes according to claim 5, characterized in that: The female cone salvage sleeve is a multi-step structure, and its inner diameter decreases step by step from the female cone salvage inlet end to the other end opposite thereto.

7. The salvage tool for handling accidents in directional long boreholes according to claim 5, characterized in that: A scoop structure is provided at the female cone salvage inlet end of the female cone salvage sleeve.

8. The salvage tool for handling accidents in directional long boreholes according to claim 1, characterized in that: The female cone salvage device comprises a female cone salvage device sleeve and a female cone. An oblique trumpet-shaped female cone salvage device inlet is provided at one end of the female cone salvage device sleeve. The female cone salvage device sleeve is fixedly connected to the outer periphery of the female cone. A female cone thread for threading an external thread is provided at the inner periphery of one end of the female cone located inside the female cone salvage device sleeve.

9. The salvage tool for handling accidents in directional long boreholes according to claim 1, characterized in that: The sleeve milling drill tool also includes a reducer, and one end of the sleeve milling drill rod located outside the borehole can be connected to the buried drill tool through the reducer.

10. The salvage tool for handling accidents in directional long boreholes according to claim 1, characterized in that: The male buckle salvage device, the female buckle salvage device, the male cone salvage device, the female cone salvage device and the sleeve milling drill tool all have passages passing through both ends.

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