Screw hydraulic returnable-type fishing tool

Abstract

The invention relates to the technical field of petroleum and natural gas fishing, in particular to a tool fishing a deformed drilling tool head. According to the technical scheme of the screw hydraulic returnable-type fishing tool, a flow dividing plate is provided with two flow dividing channels and a center flow channel; a blocking screen is fixedly installed at the center flow channel of the flow dividing plate; a rotor is provided with a center flow channel, and the lower end of the rotor is connected with a flexible universal joint; the upper end of an upper sleeve is connected with the flexible universal joint, and the lower end of the upper sleeve is installed on a bearing set; the outer end of a positioning sleeve is connected with a cylinder wall through a thread; a center spear rod is provided with a center flow channel, a spline is arranged at the upper end of the center spear rod, a tapered step is arranged at the lower end of the center spear rod, and two flow dividing channels are formed in the lower end of the center spear rod; two safety pins are in step shaft shapes; four slips are in arc shapes; a column-shaped milling shoe is provided with an annular flow channel, the upper end of the column-shaped milling shoe is connected with the center spear rod through a thread, and the lower end of the column-shaped milling shoe is in a cone shape. A downhole drilling tool can be released and fished, the drilling tool head with complex deformation can be also fished in a returnable-type mode, the fishing success rate is increased, and meanwhile the accident loss is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas salvage, in particular to a tool for salvaging the deformed fish head of a drilling tool. Background technique [0002] Drilling tools are subjected to complex stresses such as tension, compression, bending, and torsion during long-term work, and frequent alternating stresses are generated in some areas, and drilling tools are prone to fatigue damage and fall to the bottom of the well. The harsh environment causes the head of the fish to be corroded and deformed; at the same time, due to the failure of the brakes and the failure of the wellhead tools, the drill string is suddenly drilled, the drilling tool is broken, and the head of the fish is easily deformed; therefore, traditional fishing tools are difficult to deal with A salvage accident in which the head of a fallen fish is complicated and deformed. On the other hand, due to the completion of high-inclination wells and horizonta...

AI Technical Summary

Problems solved by technology

[0002] Drilling tools are subjected to complex stresses such as tension, compression, bending, and twisting during long-term work, and frequent alternating stresses are generated in some areas, and drilling tools are prone to fatigue damage and fall to the bottom of the well. The harsh environment causes corrosion and deformation of the head of the fallen fish; at the same time, due to the failure of the brakes and the failure of the wellhead tools, the drill string is suddenly drilled, the drilling tool is broken, and the head of the fallen fish is also easily deformed; therefore, traditional fishing tools are difficult to deal with Fishing Accidents with Complicated Deformation of Fish Heads

On the other hand, due to the completion of high-inclination wells and horizontal wells, the sedimentation phenomenon in the entire well section is particularly serious, which has caused great difficulties for fishing operations.

In terms of fishing equipment, traditional wellhead power equipment cannot maximize the transmission of torque and pulling force to the position of fish in highly deviated wells, and the friction between the pipe string and casing will consume a large part of the power. Therefore, conventional vertical well fishing tools are used to solve the problem. Card measures are basically difficult to implement

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