Salvage method of salvage device of rotary drilling rig

Abstract

The invention provides a salvaging method of a salvaging device of a rotary drilling rig, the salvaging device comprises a drill rod, a barrel drill, a first salvaging hook and a second salvaging hook, the barrel drill is connected to the drill rod, the first salvaging hook and the second salvaging hook are symmetrically arranged along the radial direction of the barrel drill, and the salvaging method comprises the following steps: lowering the first salvaging hook and the second salvaging hook into a pile casing of a drilling well, a drill rod is continuously reversed, the tension of a steel wire rope connected with the drill rod and the meter number of the depth of a drill bit of a barrel drill in a drilling well are recorded, a gravel area except a falling object is obtained through data analysis, then a first fishing hook and a second fishing hook sink to the position below the falling object from the gravel area, the drill rod is reversed, and the drill rod is lifted; and the bottom plate of the drilling tool is hooked by the first fishing hook and the second fishing hook, so that the bottom plate of the drilling tool is successfully fished from the bottom of a drilling well. According to the salvaging method of the salvaging device of the rotary drilling rig, the drilling tool falling into a drilling well can be effectively salvaged, the success rate is high, the structure is simple, and manpower and cost are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation construction, and particularly to a method for salvaging a drilling tool of a rotary drilling rig. Background Art

[0002] When a drilling tool of a rotary drilling rig breaks and falls into a borehole during operation, it is necessary to salvage the fallen drilling tool. If it is not retrieved, it will cause great losses to customers. Due to the relatively deep depth of the borehole, in the prior art, a permanent magnet is often hung on the drill pipe through a wire rope, and the permanent magnet is lowered to the bottom of the borehole to suck out the fallen object by magnetic attraction. However, due to the uncontrollability of the area below the surface and the great influence of various hard rock layers and other impurity obstacles, the wire rope is prone to falling off. In addition, the cost of using a permanent magnet on the drill pipe is relatively high, and the success rate is also relatively low. For example, the permanent magnet cannot be used normally due to magnetic decline caused by sediment adhesion, resulting in a reduction in the overall construction efficiency. Therefore, effectively salvaging the fallen object from the bottom of the mine and increasing the salvage rate have become urgent problems to be solved. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for salvaging a drilling tool of a rotary drilling rig. This salvaging method can effectively salvage the drilling tool that has fallen into the borehole, has a high success rate, is simple in structure, and saves manpower and costs.

[0004] The present invention provides a method for salvaging a dropped object using a rotary drilling rig salvage device. The salvage device includes a drill pipe, a barrel drill, a first salvage hook, and a second salvage hook. The barrel drill is connected to the drill pipe, and the first salvage hook and the second salvage hook are symmetrically arranged along the radial direction of the barrel drill. The dropped object in the drilling well is salvaged using the above salvage device. The salvage method includes: Step 1, place the barrel drill into the casing of the drilling well and apply pressure to sink the drill pipe. Slow down when the barrel drill is close to the bottom of the drilling well. Mark any position on the casing as the first initial position, and mark the second initial position on the drill pipe. The first initial position and the second initial position are correspondingly arranged in the vertical direction; Step 2, float and lower the drill pipe, and record the depth data of the bit of the barrel drill in the drilling well when the tension of the wire rope connected to the drill pipe is 0; Step 3, reverse the drill pipe by a set angle, continue to float and lower the drill pipe, and record the depth data of the bit of the barrel drill in the drilling well when the tension of the wire rope connected to the drill pipe is 0; Step 4, repeat the above Step 3 until it is determined that the drill pipe has rotated one week when the second initial position and the first initial position are aligned again, and obtain the gravel area at the bottom of the drilling well except for the dropped object through data analysis; Step 5, continue to sink the first salvage hook and the second salvage hook in the gravel area to a first distance below the dropped object, reverse the drill pipe, and then lift the drill pipe, observe the change in the tension of the wire rope of the drill pipe, and determine whether the first salvage hook and the second salvage hook have hooked the dropped object; Step 6, continue to lift the drill pipe. If the tension of the wire rope of the drill pipe increases, it is determined that the dropped object has been salvaged and the dropped object is effectively salvaged out.

[0005] In one embodiment, when placing the barrel drill into the casing of the drilling well, the barrel drill is centered relative to the mouth of the casing, and the bottom of the first salvage hook and the bottom of the second salvage hook are both flush with the mouth of the casing.

[0006] In one embodiment, when marking the first initial position on the casing, the first initial position is marked in the area of the casing above the ground.

[0007] In one embodiment, the set angle for reversing the drill pipe is 40° to 60°.

[0008] In one embodiment, in the fourth step of the salvage method, when the first salvage hook or / and the second salvage hook touches the dropped object, the tension of the wire rope connected to the drill pipe decreases. Repeat rotating the drill pipe to detect the position of the dropped object by the first salvage hook and the second salvage hook, and obtain the specific position of the gravel area through analysis of the tension of the wire rope and the depth data of the bit of the barrel drill in the drilling well.

[0009] In one embodiment, in the fifth step of the fishing method, the drill pipe is rotated forward and backward repeatedly to make the first fishing hook and the second fishing hook continue to sink in the gravel area.

[0010] In one embodiment, the angle of forward rotation of the drill pipe is 0° to 40°; the angle of reverse rotation of the drill pipe is 0° to 40°.

[0011] In one embodiment, the first fishing hook is provided with a first hook groove, the end face of the cylinder drill far from the drill pipe is the first end face, and the distance between the first end face and the bottom of the first hook groove is 500 mm to 700 mm. The second fishing hook is provided with a second hook groove, and the distance between the first end face and the bottom of the second hook groove is 500 mm to 700 mm.

[0012] In one embodiment, the first fishing hook includes a first fixed section, a first connecting section and a first hook head which are fixedly connected in sequence. The first fixed section is opposite to the first hook head, and the first connecting section is connected between the first fixed section and the first hook head. The distance between the first fixed section and the first hook head is 200 mm to 300 mm. The second fishing hook includes a second fixed section, a second connecting section and a second hook head which are fixedly connected in sequence. The second fixed section is opposite to the second hook head, and the second connecting section is connected between the second fixed section and the second hook head. The distance between the second fixed section and the second hook head is 200 mm to 300 mm.

[0013] In one embodiment, the first hook head includes a first top surface which is arranged at one end of the first hook head close to the cylinder drill. The distance between the first top surface and the bottom of the first hook groove is 100 mm to 200 mm. The second hook head includes a second top surface which is arranged at one end of the second hook head close to the cylinder drill. The distance between the second top surface and the bottom of the second hook groove is 100 mm to 200 mm.

[0014] In one embodiment, the orientation of the first hook head of the first fishing hook is consistent with the reverse rotation direction of the drill pipe, and the orientation of the second hook head of the second fishing hook is consistent with the reverse rotation direction of the drill pipe.

[0015] In one embodiment, both the first fishing hook and the second fishing hook are fixedly connected to the outer wall of the cylinder drill.

[0016] In one embodiment, symmetrically arranged first mounting holes, second mounting holes, third mounting holes, and fourth mounting holes are provided at one end of the cylinder drill away from the drill pipe. The first mounting hole and the second mounting hole are oppositely arranged, and the third mounting hole and the fourth mounting hole are oppositely arranged. The fishing device further includes a first rope and a second rope. One end of the first rope is fixedly connected to the first mounting hole, and the other end of the first rope is fixedly connected to the second mounting hole. One end of the second rope is fixedly connected to the third mounting hole, and the other end of the second rope is fixedly connected to the fourth mounting hole. A cross structure is formed between the first rope and the second rope.

[0017] The fishing method of the present invention uses symmetrically arranged first fishing hooks and second fishing hooks on the cylinder drill. The first fishing hook and the second fishing hook are lowered into the casing of the drilling well. By continuously reversing the drill pipe, the tension of the steel wire rope connected to the drill pipe and the number of meters of the depth of the drill bit of the cylinder drill in the drilling well are recorded. Through data analysis, the gravel area other than the dropped object is obtained. Then, the first fishing hook and the second fishing hook are sunk from the gravel area to below the dropped object, and the drill pipe is reversed and lifted, so that the first fishing hook and the second fishing hook hook the bottom plate of the drill tool, thereby successfully fishing the bottom plate of the drill tool from the bottom of the drilling well. This fishing method can quickly locate and effectively fish out the dropped object by adjusting the height and angle of the first fishing hook and combining the forward and reverse operations of the drill pipe, significantly improving the construction efficiency, enhancing the construction safety, reducing the damage to the drill tool and the fishing device of the rotary drilling rig, reducing the construction risk, and being able to adapt to various complex working conditions and fish out various different types of dropped objects, with the characteristics of strong versatility and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a partial front view structural schematic diagram of the fishing device of the present invention.

[0020] Figure 2 It is a partial side view structural schematic diagram of the fishing device of the present invention.

[0021] Figure 3 It is a partial top view structural schematic diagram of the fishing device of the present invention.

[0022] Figure 4 It is a structural schematic diagram of the first fishing hook of the present invention.

[0023] Figure 5 It is a schematic structural diagram of the salvage device of the present invention floating and lowering in the casing.

[0024] Figure 6 It is a schematic structural diagram of the salvage device of the present invention sinking to a first distance below the dropped object.

[0025] Figure 7 It is a schematic top view structural diagram of the dropped object of the present invention in the casing.

[0026] Figure 8 It is a schematic partial structural diagram of the salvage device of another embodiment of the present invention.

[0027] Explanation of reference numerals in the drawings: gravel area - 101; first hook groove - 102; second hook groove - 103; drill pipe - 11; barrel drill - 12; first end face - 121; first salvage hook - 13; first fixed section - 131; first side face - 1311; second side face - 1312; first connecting section - 132; first upper surface - 1321; first lower surface - 1322; first hook head - 133; first inner surface - 1331; first top face - 1332; second salvage hook - 14; first rope - 161; second rope - 162; casing - 17; dropped object - 18. Specific embodiments

[0028] Next, specific embodiments of the present invention will be described in detail in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0029] In the description of the present invention, unless otherwise clearly defined and limited, terms such as "set", "installed", "connected", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] The terms "first", "second", "third", etc. are only used to distinguish components with similar attributes, rather than indicating or implying relative importance or a specific order.

[0032] The term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion. In addition to the elements listed, it may also include other elements not expressly listed.

[0033] As Figures 1 to 7 shown, the salvage device of the rotary drilling rig includes a power head, a drill pipe 11, a barrel drill 12, a first salvage hook 13 and a second salvage hook 14. The drill pipe 11 is connected to the power head, the barrel drill 12 is connected to the drill pipe 11. The drill pipe 11 is preferably a short helical drill pipe 11. When the power head rotates, it drives the drill pipe 11 and the barrel drill 12 mounted on the drill pipe 11 to rotate. Therefore, when the power head rotates forward or backward, the drill pipe 11 also rotates forward or backward. The first salvage hook 13 and the second salvage hook 14 are symmetrically arranged along the radial direction of the barrel drill 12. The rotary drilling rig in this embodiment is a machine-locking rod, and its working principle is to lock when rotating forward and unlock when rotating backward. Therefore, the orientation of the first hook head 133 of the first salvage hook 13 is the same as the reverse rotation direction of the drill pipe 11, and the orientation of the second hook head of the second salvage hook 14 is the same as the reverse rotation direction of the drill pipe 11. Both the first salvage hook 13 and the second salvage hook 14 are fixedly connected to the outer wall of the barrel drill 12. The preferred way of fixed connection is welding or connection by means of cooperation between bolts and nuts, etc. The way of cooperation between bolts and nuts is taken as an example for illustration. A first connection hole is provided on the first salvage hook 13, and a second connection hole is provided on the barrel drill 12. After the bolt passes through the first connection hole and the second connection hole, it is connected to the nut. The connection method of the second salvage hook 14 is the same as that of the first salvage hook 13, and will not be elaborated here. Both the first salvage hook 13 and the second salvage hook 14 are made of plate-like materials, preferably steel plates or iron plates, etc. Without affecting the reliability and salvage rate of the salvage device, the first salvage hook 13 and the second salvage hook 14 can be locally sourced and fabricated on site at the construction site, with low costs and an economical connection method.

[0034] Since the dropped object 18 in this embodiment is a fractured object of the drill tool, for example, the bottom plate of the drill bucket, also known as the butterfly plate, the butterfly plate is formed by symmetrically arranging two similar fan-shaped plates. The following will specifically elaborate on the bottom plate of the drill bucket; when only one fishing hook is provided on the barrel drill 12, the worker at the bottom of the well cannot visually observe and determine the position of the butterfly plate hooked by the fishing hook, so it is easy for the butterfly plate to fall back into the well again due to uneven force during the lifting process, which not only wastes time and effort but also fails to achieve the expected effect. The same is true when three fishing hooks are provided on the barrel drill 12. The symmetric structure of the butterfly plate will cause the three fishing hooks to fall again due to uneven force during the fishing process; when four fishing hooks are provided on the barrel drill 12, two fishing hooks can be grouped together to hook one of the plates of the butterfly plate, and the other two fishing hooks can be grouped together to hook the other plate of the butterfly plate. Taking one group of fishing hooks as an example, when the hook heads of one group of fishing hooks are arranged in the same direction, the success rate of fishing for the butterfly plate is relatively low, and the butterfly plate cannot be hooked, and it will waste materials and costs. When the hook heads of one group of fishing hooks are arranged oppositely, the distance between the two fishing hooks needs to be controlled. If the distance is too large, the butterfly plate cannot be fished up; if the distance is too small, the butterfly plate cannot be hooked. It is time-consuming and laborious, and the fishing success rate is relatively low. Therefore, considering the above, only two symmetrically arranged fishing hooks can be used, which not only has a simple structure and is easy to install, but also can maximize the fishing rate.

[0035] As Figure 2 and Figure 4 shown, the first fishing hook 13 is provided with a first hook groove 102. The end face of the barrel drill 12 away from the drill pipe 11 is the first end face 121. The distance between the first end face 121 and the bottom of the first hook groove 102 is 500 mm to 700 mm, preferably 500 mm, 550 mm, 600 mm, 650 m or 700 mm, etc. The second fishing hook 14 is provided with a second hook groove 103. The distance between the first end face 121 and the bottom of the second hook groove 103 is 500 mm to 700 mm, preferably 500 mm, 550 mm, 600 mm, 650 m or 700 mm, etc.

[0036] Preferably, the first fishing hook 13 includes a first fixing section 131, a first connecting section 132, and a first hook head 133 that are fixedly connected in sequence. The first fixing section 131 and the first hook head 133 are oppositely arranged, and the first connecting section 132 is connected between the first fixing section 131 and the first hook head 133. The distance between the first fixing section 131 and the first hook head 133 is 200 mm to 300 mm, preferably 200 mm, 250 mm, or 300 mm, etc. Among them, the first fixing section 131 includes a first side surface 1311 and a second side surface 1312 that are oppositely arranged. The first side surface 1311 is on the side of the first fixing section 131 close to the first hook head 133. The first hook head 133 includes a first inner surface 1331, and the first inner surface 1331 is arranged close to the first fixing section 131. The distance between the first fixing section 131 and the first hook head 133 refers to the distance between the first side surface 1311 and the first inner surface 1331; the second fishing hook 14 includes a second fixing section, a second connecting section, and a second hook head that are fixedly connected in sequence. The second fixing section and the second hook head are oppositely arranged, and the second connecting section is connected between the second fixing section and the second hook head. The distance between the second fixing section and the second hook head is 200 mm to 300 mm, preferably 200 mm, 250 mm, or 300 mm, etc. Among them, the second fixing section includes a third side surface and a fourth side surface that are oppositely arranged. The third side surface is on the side of the second fixing section close to the second hook head. The second hook head includes a second inner surface, and the second inner surface is arranged close to the second fixing section. The distance between the second fixing section and the second hook head refers to the distance between the third side surface and the second inner surface. In this embodiment, the distance between the first side surface 1311 and the second side surface 1312 is 30 mm to 50 mm, preferably 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm, etc.; the distance between the third side surface and the fourth side surface is 30 mm to 50 mm, preferably 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm, etc., ensuring that the strength of the fishing hook is reasonable and it is not prone to bending or breaking.

[0037] As Figure 4 shown, the first connecting section 132 includes a first upper surface 1321 and a first lower surface 1322 that are oppositely arranged. The first upper surface 1321 is on the side of the first connecting section 132 close to the barrel drill 12. The distance between the first upper surface 1321 and the first lower surface 1322 is 30 mm to 50 mm, preferably 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm, etc.; the second connecting section includes a second upper surface and a second lower surface that are oppositely arranged. The second upper surface is on the side of the second connecting section close to the barrel drill 12. The distance between the second upper surface and the second lower surface is 30 mm to 50 mm, preferably 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm, etc., but not limited thereto.

[0038] Preferably, since it is not easy to hook the butterfly plate when the lengths of the first hook head 133 and the second hook head are too short, the first hook head 133 includes a first top surface 1332. The first top surface 1332 is provided at one end of the first hook head 133 close to the core barrel 12. The distance between the first top surface 1332 and the bottom of the first hook groove 102 is 100 mm to 200 mm, preferably 100 mm, 150 mm or 200 mm, etc.; the second hook head includes a second top surface. The second top surface is provided at one end of the second hook head close to the core barrel 12. The distance between the second top surface and the bottom of the second hook groove 103 is 100 mm to 200 mm, preferably 100 mm, 150 mm or 200 mm, etc.; at the same time, both the first hook head 133 and the second hook head can be cut into a spoon-like shape by gas welding, which is convenient for hooking the butterfly plate.

[0039] As Figure 7 shown, in other embodiments, the first fishing hook 13 and the second fishing hook 14 can also be combined with a rope for fishing, and the flexibility of the rope is used to increase the adaptability of the fishing device. Specifically, symmetrically arranged first mounting holes, second mounting holes, third mounting holes and fourth mounting holes are provided at one end of the core barrel 12 away from the drill pipe 11. The first mounting hole and the second mounting hole are oppositely arranged, and the third mounting hole and the fourth mounting hole are oppositely arranged. The fishing device further includes a first rope 161 and a second rope 162. One end of the first rope 161 is fixedly connected to the first mounting hole, and the other end of the first rope 161 is fixedly connected to the second mounting hole. One end of the second rope 162 is fixedly connected to the third mounting hole, and the other end of the second rope 162 is fixedly connected to the fourth mounting hole, so as to form a cross structure between the first rope 161 and the second rope 162.

[0040] As Figure 2 、 Figures 5 to 7 shown, using the above fishing device to fish for the dropped object 18 in the drilling, the fishing method includes: In the first step, the core barrel 12 is placed into the casing 17 of the drilling and the drill pipe 11 is pressurized to sink. When the core barrel 12 is close to the bottom of the drilling, the speed is slowed down. Any position on the casing 17 is marked as the first initial position, and the drill pipe 11 is marked as the second initial position. The first initial position and the second initial position are correspondingly arranged in the vertical direction. When the core barrel 12 is placed into the casing 17 of the drilling, the core barrel 12 is centered relative to the barrel mouth of the casing 17. The bottoms of the first fishing hook 13 and the second fishing hook 14 are flush with the barrel mouth of the casing 17, that is, the first lower surface 1322 and the second lower surface are aligned with the barrel mouth of the casing 17, ensuring that the height of the drill pipe 11 of the rotary drilling rig is zeroed. The barrel mouth of the casing 17 is set 50 cm above the ground. Therefore, when marking the first initial position, the first initial position is marked in the area of the casing 17 above the ground. Red paint can be used for marking during marking, and the color is bright and eye-catching.

[0041] In the second step, lower the drill pipe 11 floatingly, observe the tension of the wire rope connected to the drill pipe 11 and the footage of the bit of the cylinder drill 12 on the display screen in the operator's cab of the rotary drilling rig, record the data of the depth of the bit of the cylinder drill 12 in the borehole when the tension of the wire rope connected to the drill pipe 11 is 0, and then lift the drill pipe 11 by 50 cm; wherein, the wire rope refers to the wire rope of the main hoist, and the wire rope is connected to the drill pipe 11.

[0042] In the third step, reverse the drill pipe 11 by a set angle, continue to lower the drill pipe 11 floatingly, observe the tension of the wire rope and the footage of the bit of the cylinder drill 12 on the display, record the data of the depth of the bit of the cylinder drill 12 in the borehole when the tension of the wire rope connected to the drill pipe 11 is 0, and then lift the drill pipe 11 by fifty centimeters to adjust the height and position of the first fishing hook 13 and the second fishing hook 14. The set angle for reversing the drill pipe 11 is 40° - 60°, preferably 40°, 45°, 50°, 55° or 60°, etc.; it can be understood that when the power head reverses, it drives the drill pipe 11 to rotate reversely by the set angle, for example, reversing the drill pipe 11 by 50° or 60°, etc.

[0043] In the fourth step, repeat the above third step until it is determined that the drill pipe 11 has rotated one week when the second initial position is aligned with the first initial position again, and obtain the gravel area 101 at the bottom of the borehole except for the fallen object 18 through data analysis. Since the bottom plate of the drill tool is at the bottom of the borehole, when the first fishing hook 13 or / and the second fishing hook 14 touches the fallen object 18, i.e., the bottom plate of the drill tool, the bottom plate of the drill tool plays a role in bearing the first fishing hook 13 or / and the second fishing hook 14. At this time, the tension of the wire rope connected to the drill pipe 11 decreases. Repeat rotating the drill pipe 11 to detect the position of the fallen object 18 by the first fishing hook 13 and the second fishing hook 14, so as to analyze and obtain the specific position of the gravel area 101 through the data of the tension of the wire rope and the depth of the bit of the cylinder drill 12 in the borehole; the gravel area 101 refers to the area at the bottom of the mine except for the fallen object 18.

[0044] In the fifth step, as Figure 6As shown, lower the first fishing hook 13 and the second fishing hook 14 in the gravel area 101 to a first distance below the dropped object 18, so that the first fishing hook 13 and the second fishing hook 14 are lowered below the dropped object 18. Reverse the power head to synchronously reverse the drill pipe 11, so that the main pump pressure reaches a set pressure, that is, above 200 bar. Herein, the main pump refers to the main pump of the rotary drilling rig. The main pump is connected to the power head. When the torque of the power head increases, the main pump pressure also increases. Therefore, the rotation angle of the power head is determined by the main pump pressure, so that the first fishing hook 13 and the second fishing hook 14 rotate to the area where the dropped object 18 can be hooked. Then lift the drill pipe 11, observe the change of the wire rope tension of the drill pipe 11, and judge whether the first fishing hook 13 and the second fishing hook 14 have hooked the dropped object 18. If the wire rope tension increases, it is judged that the dropped object 18 has been hooked. Repeat the forward and reverse rotation of the drill pipe 11 to continue lowering the first fishing hook 13 and the second fishing hook 14 in the gravel area 101. The forward rotation angle of the drill pipe 11 is 0° to 40°, preferably 5°, 10°, 20°, 30° or 40°, etc., but not including 0°; the reverse rotation angle of the drill pipe 11 is 0° to 40°, preferably 5°, 10°, 20°, 30° or 40°, etc., but not including 0°. The first distance in this embodiment is 50 cm to 100 cm, preferably 50 cm, 60 cm, 70 cm, 80 cm, 90 cm or 100 cm, etc.

[0045] Sixth step, continue to lift the drill pipe 11. If the wire rope tension of the drill pipe 11 increases, it is determined that the dropped object 18 has been salvaged and the dropped object 18 has been effectively salvaged. Due to the sediment and water pressure on the drill tool, there is a suction force between the bottom plate of the drill tool and the clay layer. Therefore, when the first fishing hook 13 and the second fishing hook 14 hook the bottom plate of the drill tool and start to lift, the wire rope tension will increase significantly. Therefore, it can be judged that the dropped object 18 has been successfully salvaged.

[0046] The fishing method of the present invention adopts symmetrically arranging a first fishing hook 13 and a second fishing hook 14 on a barrel drill 12, lowering the first fishing hook 13 and the second fishing hook 14 into a casing 17 of a drilling well, continuously reversing a drill pipe 11, recording the tension of a wire rope connected to the drill pipe 11 and the number of meters of the depth of the bit of the barrel drill 12 in the drilling well, obtaining a gravel area 101 other than a dropped object 18 through data analysis, then sinking the first fishing hook 13 and the second fishing hook 14 from the gravel area 101 to below the dropped object 18, reversing and lifting the drill pipe 11 to hook the bottom plate of a drilling tool with the first fishing hook 13 and the second fishing hook 14, so as to successfully fish the bottom plate of the drilling tool from the bottom of the drilling well. By adjusting the height and angle of the first fishing hook 13 and combining the forward and reverse operations of the drill pipe 11, this fishing method can quickly locate and effectively fish out the dropped object 18, significantly improve the construction efficiency, enhance the construction safety, reduce the damage to the drilling tool and the rotary drilling rig fishing device, reduce the construction risk, can adapt to various complex working conditions and fish out various different types of dropped objects 18, and has the characteristics of strong versatility and high reliability.

[0047] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A fishing method for a fishing device of a rotary drilling rig. The fishing device includes a drill pipe (11), a bucket drill (12), a first fishing hook (13) and a second fishing hook (14). The bucket drill (12) is connected to the drill pipe (11), and the first fishing hook (13) and the second fishing hook (14) are symmetrically arranged along the radial direction of the bucket drill (12). It is characterized in that, Use the above salvage device to salvage the dropped object (18) in the drilling well. The salvage method includes: In the first step, place the cylinder drill (12) into the casing (17) of the drilling well and apply pressure to sink the drill pipe (11). When the cylinder drill (12) is close to the bottom of the drilling well, slow down the speed. Mark any position on the casing (17) as the first initial position, and mark the second initial position on the drill pipe (11). The first initial position and the second initial position are arranged corresponding to each other in the vertical direction. In the second step, lower the drill pipe (11) floatingly, and record the data of the depth of the bit of the cylinder drill (12) in the drilling well when the tension of the wire rope connected to the drill pipe (11) is 0. In the third step, reverse the drill pipe (11) by a set angle, continue to lower the drill pipe (11) floatingly, and record the data of the depth of the bit of the cylinder drill (12) in the drilling well when the tension of the wire rope connected to the drill pipe (11) is 0. In the fourth step, repeat the above third step until it is determined that the drill pipe (11) has rotated one week when the second initial position and the first initial position are aligned again, and obtain the gravel area (101) at the bottom of the drilling well except the dropped object (18) through data analysis. In the fifth step, continue to lower the first fishing hook (13) and the second fishing hook (14) in the gravel area (101) to a first distance below the dropped object (18), then reverse the drill pipe (11), and then lift the drill pipe (11), observe the change of the tension of the wire rope of the drill pipe (11), and judge whether the first fishing hook (13) and the second fishing hook (14) hook the dropped object (18). In the sixth step, continue to lift the drill pipe (11). If the tension of the wire rope of the drill pipe (11) increases, it is determined that the dropped object (18) has been salvaged and the dropped object (18) is effectively salvaged.

2. The fishing method of the rotary drilling rig fishing device according to claim 1, characterized in that, When the cylinder drill (12) is placed into the casing (17) of the drilling well, the cylinder drill (12) is centered relative to the mouth of the casing (17). The bottoms of the first fishing hook (13) and the second fishing hook (14) are flush with the mouth of the casing (17).

3. The fishing method of the rotary drilling rig fishing device according to claim 1, characterized in that, When marking the first initial position on the casing (17), the first initial position is marked in the area of the casing (17) above the ground.

4. The salvage method of the rotary drilling rig salvage device according to claim 1, characterized in that, The set angle for reversing the drill pipe (11) is 40° - 60°.

5. The fishing method of the rotary drilling rig fishing device according to claim 1, characterized in that, In the fourth step of the salvage method, when the first fishing hook (13) or / and the second fishing hook (14) touches the dropped object (18), the tension of the wire rope connected to the drill pipe (11) decreases. Repeat rotating the drill pipe (11) to make the first fishing hook (13) and the second fishing hook (14) detect the position of the dropped object (18), and analyze the specific position of the gravel area (101) through the data of the tension of the wire rope and the depth of the bit of the cylinder drill (12) in the drilling well.

6. The salvage method of the rotary drilling rig salvage device according to claim 1, characterized in that, In the fifth step of the salvage method, the drill pipe (11) is rotated forward and backward repeatedly to make the first salvage hook (13) and the second salvage hook (14) continue to sink in the gravel area (101).

7. The fishing method of the rotary drilling rig fishing device according to claim 6, characterized in that, The forward rotation angle of the drill pipe (11) is 0° to 40°; the reverse rotation angle of the drill pipe (11) is 0° to 40°.

8. The fishing method of the rotary drilling rig fishing device according to claim 1, characterized in that The first salvage hook (13) is provided with a first hook groove (102). The end face of the barrel drill (12) far from the drill pipe (11) is the first end face (121). The distance between the first end face (121) and the bottom of the first hook groove (102) is 500 mm to 700 mm. The second salvage hook (14) is provided with a second hook groove (103). The distance between the first end face (121) and the bottom of the second hook groove (103) is 500 mm to 700 mm.

9. The fishing method of the rotary drilling rig fishing device according to claim 8, characterized in that, The first salvage hook (13) includes a first fixed section (131), a first connecting section (132) and a first hook head (133) which are fixedly connected in sequence. The first fixed section (131) is arranged opposite to the first hook head (133). The first connecting section (132) is connected between the first fixed section (131) and the first hook head (133). The distance between the first fixed section (131) and the first hook head (133) is 200 mm to 300 mm. The second salvage hook (14) includes a second fixed section, a second connecting section and a second hook head which are fixedly connected in sequence. The second fixed section is arranged opposite to the second hook head. The second connecting section is connected between the second fixed section and the second hook head. The distance between the second fixed section and the second hook head is 200 mm to 300 mm.

10. The fishing method of the rotary drilling rig fishing device according to claim 9, characterized in that, The first hook head (133) includes a first top surface (1332). The first top surface (1332) is arranged at one end of the first hook head (133) close to the barrel drill (12). The distance between the first top surface (1332) and the bottom of the first hook groove (102) is 100 mm to 200 mm. The second hook head includes a second top surface. The second top surface is arranged at one end of the second hook head close to the barrel drill (12). The distance between the second top surface and the bottom of the second hook groove (103) is 100 mm to 200 mm.

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