Underground auxiliary fishing tool

Abstract

The utility model discloses an underground auxiliary fishing tool which comprises an upper connector, a detachable center rod is arranged on the lower portion of the upper connector, a detachable milling head is arranged on the lower portion of the center rod, the milling head comprises a milling column body and an arc-shaped milling shoe with an arc bottom, and the milling column body is connected with the milling shoe. A pair of flushing water holes is formed in the top of the arc-bottom milling shoe, and the arrangement directions of the flushing water holes are perpendicular to each other. The fishing tool can grind and mill scale and dirt on the inner wall of an underground oil pipe to provide a space for next-step fishing of the interior of the oil pipe, so that the penetration strength of a slip or a screw thread of the fishing tool is improved, and the fishing tool in the oil pipe can conveniently enter an oil pipe body to make a thread for fishing on the inner wall of the oil pipe or penetrate into the slip for fishing. The fishing tool is simple and exquisite in structure and reliable in performance, and the success rate of fishing the underground fish oil pipe is effectively increased.

Description

Technical Field

[0001] The utility model relates to an oil production tool, more specifically, to an underground auxiliary fishing tool. Background Art

[0002] Downhole operations are a technical means to ensure the normal production of oil and water wells during oilfield exploration and development. The method for dealing with dropped objects in downhole operations is generally to use corresponding salvage tools according to different dropped objects, and to salvage the dropped objects by internal or external salvage. In the production process of oil, gas and water wells, due to the high mineralization of the formation and other reasons, some scaling of the inner wall of the dropped objects will occur during the downhole operation of the oil well. When using conventional internal salvage tools (male cones, salvage spears, etc.) for salvage, there is a possibility that the salvage tools cannot enter the inner cavity normally or the salvage tool thread (slip) eats into the scaling part, which will cause the dropped objects to slip and fall into the well again, and the success rate of salvage is low. Utility Model Content

[0003] Based on this, it is necessary to provide an underground auxiliary salvage tool to address the above technical problems.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A downhole auxiliary salvage tool, characterized in that the downhole auxiliary salvage tool comprises an upper joint, a detachable center rod is provided at the lower part of the upper joint, a detachable milling head is provided at the lower part of the center rod, the milling head comprises a milling column and an arc-shaped arc-bottom milling shoe, a pair of flushing water holes are provided at the top of the arc-bottom milling shoe, and the arrangement directions of the flushing water holes are perpendicular to each other.

[0006] A penetrating upper joint channel is provided at the center of the upper joint, a penetrating center rod channel is provided at the center of the center rod, a milling head channel is provided at the center of the milling head, and the upper joint channel, center rod channel, milling head channel and flushing water eye are connected.

[0007] As a preferred embodiment of the utility model, the upper part of the upper joint is provided with a drill rod female buckle, the lower part of the upper joint is provided with an upper joint internal thread buckle, the upper part of the center rod is provided with a center rod external thread buckle, the center rod external thread buckle matches with the upper joint internal thread buckle, the lower part of the center rod is provided with a center rod internal thread buckle, the upper part of the milling head is provided with a milling head external thread buckle, the milling head external thread buckle matches with the center rod internal thread buckle.

[0008] As a preferred embodiment of the utility model, the drill rod female buckle is a 27 / 8 drill rod buckle, the upper joint internal thread buckle is an M57*3 buckle type, the center rod internal thread buckle is an M40*3 buckle type, the outer diameter of the center rod is 57mm, the inner diameter of the center rod is 33mm, and the length of the center rod is 1.5m.

[0009] As a preferred embodiment of the utility model, the inner diameter of the milling head channel is 18 mm, and the curvature of the arc-bottom grinding shoe is 58 mm.

[0010] As a preferred embodiment of the present utility model, the inner diameter of the flushing water eye is 10 mm.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model provides an underground auxiliary salvage tool, which can grind the scale and dirt on the inner wall of the underground oil pipe, provide space for the next step of salvaging inside the oil pipe, thereby improving the strength of the salvage tool slips or threads, facilitating the oil pipe internal salvage tool to enter the oil pipe body, make a buckle on the inner wall of the oil pipe for salvage or slips for salvage. The salvage tool has a simple and exquisite structure and reliable performance, and effectively improves the success rate of salvaging the oil pipe down the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a structural schematic diagram of the downhole auxiliary fishing tool of the utility model;

[0015] Figure 2 for Figure 1 A detailed enlarged schematic diagram of area A of the structural schematic diagram of the downhole auxiliary fishing tool;

[0016] The markings in the figure are as follows: 1. Upper joint; 10. Upper joint channel; 11. Drill pipe female buckle; 12. Upper joint internal thread buckle; 2. Center rod; 20. Center rod channel; 21. Center rod external thread buckle; 22. Center rod internal thread buckle; 3. Milling head; 30. Milling head channel; 31. Milling cylinder; 32. Arc-bottom grinding shoe. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] like Figure 1 and Figure 2 As shown, the downhole auxiliary salvage tool includes an upper joint 1, a detachable center rod 2 is provided at the lower part of the upper joint 1, a detachable grinding head 3 is provided at the lower part of the center rod 2, the grinding head 3 includes a grinding cylinder 31 and an arc-shaped arc-bottom grinding shoe 32, a pair of flushing water holes 33 are provided at the top of the arc-bottom grinding shoe 32, and the setting directions of the flushing water holes 33 are perpendicular to each other.

[0019] A penetrating upper joint channel 10 is provided at the center of the upper joint 1, a penetrating center rod channel 20 is provided at the center of the center rod 2, and a milling head channel 30 is provided at the center of the milling head 3. The upper joint channel 10, the center rod channel 20, the milling head channel 30 and the flushing water hole 33 are connected.

[0020] The upper part of the upper joint 1 is provided with a drill pipe female buckle 11, the lower part of the upper joint 1 is provided with an upper joint internal thread buckle 12, the upper part of the center rod 2 is provided with a center rod external thread buckle 21, the center rod external thread buckle 21 cooperates with the upper joint internal thread buckle 12, the lower part of the center rod 2 is provided with a center rod internal thread buckle 22, the upper part of the milling head 3 is provided with a milling head external thread buckle 34, the milling head external thread buckle 34 cooperates with the center rod internal thread buckle 22.

[0021] The following is an explanation of the method for using the downhole auxiliary fishing tool.

[0022] like Figure 1 As shown, the drill pipe female buckle 11 is a 27 / 8 drill pipe buckle, the upper joint internal thread buckle 12 is an M57*3 buckle type, the center rod internal thread buckle 22 is an M40*3 buckle type, the outer diameter of the center rod 2 is 57mm, the inner diameter of the center rod 2 is 33mm, and the length of the center rod 2 is 1.5m. The inner diameter of the milling head channel 30 is 18mm, and the curvature of the arc-bottom grinding shoe 32 is 58mm. The inner diameter of the flushing water hole 33 is 10mm.

[0023] It should be noted that the sizes of the upper joint 1, the center rod 2 and the milling head 3 can be changed as necessary according to the needs of the use environment.

[0024] The method includes the following steps:

[0025] Step 1: Check the connection threads of the upper joint 1, the center rod 2 and the milling head 3, apply oil to each component, then connect the upper joint 1, the center rod 2 and the milling head 3, and tighten them to complete the assembly of the fishing tool;

[0026] Step 2: Use the drill pipe box buckle 11 of the upper joint 1 to connect with the drilling tool (i.e., the pipe string), with a make-up torque of 3 KN·m, and lower it into the well;

[0027] Step 3: Lower the fishing tool to 1 to 2 meters above the top of the fish and start the pump for one cycle;

[0028] Step 4: Start the turntable (or power faucet) in normal circulation, slowly lower the pipe string, pressurize it to 5-8kN, keep the turntable speed at 10-20r / min and the displacement at 7-11L / s to clean the inner cavity;

[0029] Step 5: When the effective footage is less than 1.5 m, the fishing tool is removed after the well is fully cleaned;

[0030] Step 6: Select a salvage tool with a suitable inner diameter of the pipe for salvage.

[0031] The salvage tool can grind the scale and dirt on the inner wall of the downhole oil pipe, providing space for the next step of salvaging inside the oil pipe, thereby improving the penetration strength of the salvage tool slips or threads, making it easier for the oil pipe internal salvage tool to enter the oil pipe body, making a buckle on the inner wall of the oil pipe for salvage or slips for salvage. The salvage tool has a simple and exquisite structure and reliable performance, effectively improving the success rate of salvaging the oil pipe down the well.

[0032] Without limitation to this, any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope defined in the claims.

Claims

1. A downhole auxiliary fishing tool, characterized in that: The downhole auxiliary salvage tool comprises an upper joint (1), a detachable center rod (2) is provided at the lower part of the upper joint (1), a detachable milling head (3) is provided at the lower part of the center rod (2), the milling head (3) comprises a milling column (31) and an arc-shaped arc-bottom milling shoe (32), a pair of flushing water holes (33) are provided at the top of the arc-bottom milling shoe (32), and the arrangement directions of the flushing water holes (33) are perpendicular to each other. A through upper joint channel (10) is provided at the center of the upper joint (1), a through center rod channel (20) is provided at the center of the center rod (2), a through milling head channel (30) is provided at the center of the milling head (3), and the upper joint channel (10), the center rod channel (20), the milling head channel (30) and the flushing water hole (33) are connected.

2. The downhole auxiliary fishing tool according to claim 1, characterized in that: The upper part of the upper joint (1) is provided with a drill rod female buckle (11), the lower part of the upper joint (1) is provided with an upper joint internal thread buckle (12), the upper part of the center rod (2) is provided with a center rod external thread buckle (21), the center rod external thread buckle (21) matches with the upper joint internal thread buckle (12), the lower part of the center rod (2) is provided with a center rod internal thread buckle (22), the upper part of the milling head (3) is provided with a milling head external thread buckle (34), the milling head external thread buckle (34) matches with the center rod internal thread buckle (22).

3. The downhole auxiliary fishing tool according to claim 2, characterized in that: The drill pipe female buckle (11) is 2 7 / 8 drill rod buckle, the upper joint internal thread buckle (12) is an M57*3 buckle type, the center rod internal thread buckle (22) is an M40*3 buckle type, the outer diameter of the center rod (2) is 57mm, the inner diameter of the center rod (2) is 33mm, and the length of the center rod (2) is 1.5m.

4. The downhole auxiliary fishing tool according to claim 2, characterized in that: The inner diameter of the milling head channel (30) is 18 mm, and the curvature of the arc-bottom grinding shoe (32) is 58 mm.

5. The downhole auxiliary fishing tool according to claim 2, characterized in that: The inner diameter of the flushing water hole (33) is 10 mm.

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