Small-hole low-speed righting, milling, buckling and fishing screw drill

Abstract

The slim-hole low-speed righting, milling, buckling and fishing screw drill comprises a shell, the inner top of the shell is fixedly connected with an ultra-low-speed motor, the output end of the ultra-low-speed motor is fixedly connected with a telescopic rod, the bottom of the telescopic rod is fixedly connected with a threaded rod, and the threaded rod is fixedly connected with a screw rod. The outer wall of the threaded rod is sleeved with a limiting plate in threaded connection with the threaded rod, a rotating rod is fixedly connected to the bottom of the threaded rod, a milling drill bit is fixedly connected to the bottom of the rotating rod, a fixing plate is fixedly connected to the inner wall of the shell, and two waterproof hydraulic rods are fixedly connected to the bottom of the fixing plate. The output ends of the two waterproof hydraulic rods are jointly and fixedly connected with a lifting plate, the bottom of the lifting plate is rotationally connected with three deflection plates, and the bottom of the shell is rotationally connected with three righting clamping plates. According to the invention, the ultra-low speed motor is adopted, the fish can be firstly centralized and then milled, the fishing of the fish is completed, and the fish fishing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw drill tools, in particular to a small-borehole low-speed straightening, milling and fishing screw drill tool. Background Art

[0002] With the extension of exploration and drilling fields, there are more and more horizontal wells and underbalanced wells. These wells often have deflected well walls and deformed casings. In addition, the wellbore is small, and it is difficult to return drill cuttings during drilling and grinding. The tools accompanying the changes in the wellbore trajectory often get stuck or fall into the well. The tools fall to the bottom of the well, commonly known as falling fish. Therefore, a small-bore, low-speed straightening, milling, and fishing screw drilling tool is needed to salvage the fallen fish.

[0003] When fishing with existing screw drills, due to the small wellbore, well inclination and casing deformation, as well as the uncertain direction of the fish deviation, the ground is used to drive the pipe string to rotate, and the fish is fished with a fishing tube and a spear, which can easily cause casing damage and is difficult to catch the fish. Different fishing tools often need to be replaced to try, and the efficiency of fishing is low. The use of screw drills equipped with a fishing tube for rotating fishing is often low due to the fast screw drilling speed and the unknown direction of the fish deviation. Therefore, we designed a small-bore low-speed straightening milling screw drill to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a small-bore low-speed straightening, milling and fishing screw drill, which adopts an ultra-low-speed motor to first straighten the fallen fish and then perform milling to complete the catching of the fallen fish, and the efficiency of catching fish is improved.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A low-speed straightening, milling and fishing screw drilling tool for a small well, comprising a shell, an ultra-low-speed motor is fixedly connected to the inner top of the shell, a telescopic rod is fixedly connected to the output end of the ultra-low-speed motor, a threaded rod is fixedly connected to the bottom of the telescopic rod, a limit plate is sleeved on the outer wall of the threaded rod and is threadedly connected thereto, the limit plate is fixedly connected to the inner wall of the shell, a rotating rod is fixedly connected to the bottom of the threaded rod, a milling drill bit is fixedly connected to the bottom of the rotating rod, a fixing plate is fixedly connected to the inner wall of the shell, two waterproof hydraulic rods are fixedly connected to the bottom of the fixing plate, a lifting plate is fixedly connected to the output ends of the two waterproof hydraulic rods, three deflection plates are rotatably connected to the bottom of the lifting plate, three straightening splints are rotatably connected to the bottom of the shell, the bottom of each deflection plate is respectively rotatably connected to the side wall of the corresponding straightening splint, a top block is fixedly connected to the top of the shell, a mounting block is sleeved on the outer wall of the top block, and a limit mechanism is provided between the top block and the mounting block.

[0006] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the limiting structure includes a screw rod that passes through the top block and is rotatably connected to it, the end of the screw rod away from the top block is fixedly connected to a handle, the outer wall of the screw rod is sleeved with two movable plates threadedly connected to it, the opposite ends of the two movable plates are fixedly connected to plug blocks, the mounting block is provided with two sockets, and the two plug blocks are respectively inserted into the sockets.

[0007] In order to better achieve the above purpose, the present invention adopts a further technical solution: the outer wall of the threaded rod is provided with an external thread, the limiting plate is penetrated with a threaded through hole, and the inner wall of the threaded through hole is provided with an internal thread matching the external thread.

[0008] In order to better achieve the above purpose, the present invention adopts a further technical solution: a first opening is opened through the fixed plate, the rotating rod is arranged through the first opening, a second opening is opened through the lifting plate, and the rotating rod is arranged through the second opening.

[0009] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the three deflection plates and the straightening splints are distributed at equal intervals.

[0010] In order to better achieve the above purpose, the present invention adopts a further technical solution: a groove is provided at one end of the mounting block close to the top block, the top block is inserted into the groove, and the cross-section of the top block is rectangular.

[0011] In order to better achieve the above purpose, the present invention adopts a further technical solution: the screw rod is provided with two sections of external threads with opposite thread directions, and the two movable plates are respectively sleeved on the outer walls of the two sections of external threads with opposite thread directions.

[0012] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the inner wall of the top block is fixedly connected with a sliding rod, and the sliding rod passes through the two moving plates and is slidably connected thereto.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Start the two waterproof hydraulic rods to make them contract synchronously and drive the lifting plate to move toward the fixed plate. The movement of the lifting plate drives the three deflection plates to deflect and rotate the straightening splints until the three straightening splints move relatively to clamp the fallen fish and straighten it.

[0014] 2. The output end of the ultra-low speed motor drives the telescopic rod, threaded rod, rotating rod and milling drill bit to rotate. The threaded rod and the limit plate cooperate to make the threaded rod, rotating rod and milling drill bit rotate forward and move downward. During this process, the telescopic rod is extended until the milling drill bit is inserted into the fish that is corrected and limited. The fish is milled and the drill is slowly lifted until the fish is fished out.

[0015] 3. The staff holds the handle and rotates it to drive the screw to rotate, so that the movable plates and plug-in blocks on both sides move relatively until the plug-in blocks are separated from the sockets. The device can then be removed for maintenance and replacement, which is simple to operate.

[0016] In summary, the present invention adopts an ultra-low speed motor, which can first straighten the fallen fish and then perform milling to complete the catching of the fallen fish, and the efficiency of catching fish is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a small-hole low-speed straightening milling threaded rod drilling tool for fishing proposed by the present invention; Figure 2 It is a first cross-sectional schematic diagram of a small-hole low-speed straightening milling threaded rod drilling tool for fishing proposed by the present invention; Figure 3 A second cross-sectional schematic diagram of a small-hole low-speed straightening milling threaded rod drilling tool for fishing proposed by the present invention; Figure 4 A third cross-sectional schematic diagram of a small-hole low-speed straightening milling threaded rod drilling tool for fishing proposed by the present invention; Figure 5 for Figure 4 A magnified view of the structure in the middle.

[0018] In the figure: 1 housing, 2 ultra-low speed motor, 3 telescopic rod, 4 threaded rod, 5 limit plate, 6 rotating rod, 7 milling drill, 8 fixing plate, 9 first opening, 10 waterproof hydraulic rod, 11 lifting plate, 12 second opening, 13 deflection plate, 14 straightening splint, 15 top block, 16 mounting block, 17 groove, 18 screw rod, 19 handle, 20 moving plate, 21 sliding rod, 22 plug block, 23 plug hole. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Reference Figure 1-Figure 5The invention relates to a low-speed straightening milling and buckling screw drilling tool for fishing in a small well, comprising a shell 1, an ultra-low-speed motor 2 is fixedly connected to the inner top of the shell 1, a telescopic rod 3 is fixedly connected to the output end of the ultra-low-speed motor 2, a threaded rod 4 is fixedly connected to the bottom of the telescopic rod 3, the outer wall of the threaded rod 4 is provided with a limiting plate 5 threadedly connected thereto, the outer wall of the threaded rod 4 is provided with an external thread, a threaded through hole is penetrated through the limiting plate 5, the inner wall of the threaded through hole is provided with an internal thread matching the external thread, the limiting plate 5 is fixedly connected to the inner wall of the shell 1, a rotating rod 6 is fixedly connected to the bottom of the threaded rod 4, and a milling drill bit 7 is fixedly connected to the bottom of the rotating rod 6. The output end of the ultra-low-speed motor 2 can be used to drive the milling drill bit 7 to rotate and move downward, and the milling drill bit 7 is inserted into the fish falling body. The output end of the ultra-low-speed motor 2 can be used to drive the milling drill bit 7 to rotate and move upward, and the milling drill bit 7 is pulled out of the fish falling body.

[0021] A fixing plate 8 is fixedly connected to the inner wall of the shell 1, a first opening 9 is penetrated through the fixing plate 8, a rotating rod 6 is arranged through the first opening 9, two waterproof hydraulic rods 10 are fixedly connected to the bottom of the fixing plate 8, a lifting plate 11 is fixedly connected to the output ends of the two waterproof hydraulic rods 10, a second opening 12 is penetrated through the lifting plate 11, a rotating rod 6 is arranged through the second opening 12, three deflection plates 13 are rotatably connected to the bottom of the lifting plate 11, three righting splints 14 are rotatably connected to the bottom of the shell 1, the bottom of each deflection plate 13 is rotatably connected to the side wall of the corresponding righting splint 14, the three deflection plates 13 and the righting splints 14 are distributed at equal intervals, starting the waterproof hydraulic rod 10 can drive the three righting splints 14 to move relative to each other, clamp the fallen fish, and right it, so as to facilitate the subsequent milling buckle and fish catching operations.

[0022] A top block 15 is fixedly connected to the top of the shell 1. A mounting block 16 is sleeved on the outer wall of the top block 15. The mounting block 16 is installed on the salvaging device. A groove 17 is opened at one end of the mounting block 16 close to the top block 15. The top block 15 is inserted into the groove 17. The cross section of the top block 15 is rectangular. A limiting mechanism is provided between the top block 15 and the mounting block 16. The limiting structure includes a screw rod 18 that penetrates the top block 15 and is rotatably connected thereto. The screw rod 18 is provided with two sections of external threads in opposite directions. Two movable plates 20 are respectively sleeved on the outer walls of the two sections of external threads in opposite directions. A sliding rod 21 is fixedly connected to the inner wall of the top block 15. The sliding rod 21 It penetrates the two movable plates 20 and is slidably connected thereto, one end of the screw rod 18 away from the top block 15 is fixedly connected to a handle 19, the outer wall of the screw rod 18 is sleeved with two movable plates 20 threadedly connected thereto, the opposite ends of the two movable plates 20 are fixedly connected with plug blocks 22, the plug blocks 22 penetrate the top block 15 and are slidably connected thereto, the mounting block 16 is provided with two insertion holes 23, the two insertion blocks 22 are respectively inserted into the insertion holes 23, and the installation and fixation of the top block 15 and the mounting block 16 can be completed by inserting the insertion blocks 22 into the insertion holes 23. When the device is damaged, the device can be quickly removed for inspection and replacement by rotating the handle 19 in the opposite direction.

[0023] In the present invention, the device is placed in a small wellbore for exploration drilling, the position of the device is adjusted until the device is close to the fish, and the two waterproof hydraulic rods 10 are started to make the two waterproof hydraulic rods 10 shrink synchronously and drive the lifting plate 11 to move in the direction of the fixed plate 8, and the three deflection plates 13 are deflected by the movement of the lifting plate 11 to rotate the straightening clamp 14 until the three straightening clamps 14 move relatively to clamp the fish and straighten it, at this time, the ultra-low speed motor 2 is started, and the output end of the ultra-low speed motor 2 drives the telescopic rod 3, the threaded rod 4, the rotating rod 6, and the milling drill bit 7 to rotate, and the threaded rod 4 and the limit plate 5 cooperate to make the threaded rod 4, the rotating rod 6, and the milling drill bit 7 rotate forward and move downward. In this process, the telescopic rod 3 is extended until the milling drill The head 7 is inserted into the fish that has been corrected and limited, the fish is milled, and the drill bit is slowly lifted up until the fish is fished out; finally, the ultra-low speed motor 2 is started to reverse its output end, so that the milling drill bit 7 is separated from the fish, and at this time, the two waterproof hydraulic rods 10 are extended to drive the three correcting clamps 14 to no longer be clamped with the fish, and the operation of fishing the fish can be completed; after the fish is fished out, if the device is damaged, the staff will hold the handle 19 and rotate it to drive the screw 18 to rotate, so that the movable plates 20 and the plug blocks 22 on both sides move relative to each other, until the plug blocks 22 are separated from the sockets 23, and the device can be removed for maintenance and replacement. After the replacement is completed, the top block 15 is inserted into the groove 17, and the handle 19 is rotated in the opposite direction to insert the plug blocks 22 on both sides into the sockets 23 respectively, so as to complete the installation and fixation of the device.

[0024] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A small-hole low-speed straightening milling screw drilling tool for fishing, comprising a housing (1), characterized in that: The inner top of the housing (1) is fixedly connected to an ultra-low speed motor (2); the output end of the ultra-low speed motor (2) is fixedly connected to a telescopic rod (3); the bottom of the telescopic rod (3) is fixedly connected to a threaded rod (4); the outer wall of the threaded rod (4) is sleeved with a limit plate (5) threadedly connected thereto; the limit plate (5) is fixedly connected to the inner wall of the housing (1); the bottom of the threaded rod (4) is fixedly connected to a rotating rod (6); the bottom of the rotating rod (6) is fixedly connected to a milling drill bit (7); the inner wall of the housing (1) is fixedly connected to a fixing plate (8); the bottom of the fixing plate (8) is fixedly connected to Two waterproof hydraulic rods (10) are connected, and the output ends of the two waterproof hydraulic rods (10) are fixedly connected to a lifting plate (11). The bottom of the lifting plate (11) is rotatably connected to three deflection plates (13). The bottom of the shell (1) is rotatably connected to three straightening clamps (14). The bottom of each deflection plate (13) is rotatably connected to the side wall of its corresponding straightening clamp (14). The top of the shell (1) is fixedly connected to a top block (15). The outer wall of the top block (15) is provided with a mounting block (16). A limiting mechanism is provided between the top block (15) and the mounting block (16).

2. A small-hole low-speed straightening milling screw drilling tool for fishing according to claim 1, characterized in that: The limiting structure comprises a screw rod (18) penetrating the top block (15) and rotatably connected thereto, one end of the screw rod (18) away from the top block (15) being fixedly connected to a handle (19), an outer wall of the screw rod (18) being sleeved with two movable plates (20) threadedly connected thereto, opposite ends of the two movable plates (20) being fixedly connected to plug blocks (22), the mounting block (16) being provided with two plug holes (23), the two plug blocks (22) being respectively inserted into the plug holes (23) for arrangement.

3. A small hole low-speed straightening milling screw drilling tool for fishing according to claim 1, characterized in that: The outer wall of the threaded rod (4) is provided with an external thread, the limiting plate (5) is provided with a threaded through hole, and the inner wall of the threaded through hole is provided with an internal thread matching the external thread.

4. A small-hole low-speed straightening milling screw drilling tool for fishing according to claim 1, characterized in that: The fixed plate (8) is provided with a first opening (9), the rotating rod (6) is provided through the first opening (9), the lifting plate (11) is provided with a second opening (12), the rotating rod (6) is provided through the second opening (12).

5. The low-speed straightening milling screw drilling tool for fishing in a small hole according to claim 1, characterized in that: The three deflection plates (13) and the straightening clamping plates (14) are distributed at equal intervals.

6. A small-hole low-speed straightening milling screw drilling tool for fishing according to claim 2, characterized in that: A groove (17) is formed at one end of the mounting block (16) close to the top block (15), and the top block (15) is inserted into the groove (17). The cross section of the top block (15) is rectangular.

7. The low-speed straightening milling screw drilling tool for fishing in a small well according to claim 2, characterized in that: The screw rod (18) is provided with two sections of external threads with opposite thread directions, and the two movable plates (20) are respectively sleeved on the outer walls of the two sections of external threads with opposite thread directions.

8. The low-speed straightening milling screw drilling tool for fishing in a small well according to claim 2, characterized in that: A sliding rod (21) is fixedly connected to the inner wall of the top block (15), and the sliding rod (21) passes through the two movable plates (20) and is slidably connected thereto.

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