Multi-size fishing tool capable of being tightened in radial direction

Abstract

The multi-size fishing tool capable of being tightened in the radial direction comprises an outer pipe and an inner pipe, an outer fishing hook is fixed to the bottom end of the outer pipe, through grooves are formed in the pipe wall of the lower portion of the inner pipe, and an inner fishing hook capable of swinging in the radial direction of the inner pipe is connected into each through groove in a pivoted mode. An elastic tightening assembly is arranged in the inner pipe, and the part, located below the pivoted position of the inner fishing hooks, of each inner fishing hook is connected with the elastic tightening assembly. A hydraulic pushing block is arranged in the inner pipe and located above the elastic tightening assembly in a sleeving mode, pushing protruding blocks are arranged on the outer side of the hydraulic pushing block, and each pushing protruding block can stretch into the corresponding through groove and can abut against the corresponding inner fishing hook. According to the multi-size fishing tool capable of being tightened in the radial direction, downhole falling fish can be effectively grasped during fishing, grasping force is continuously provided in the lifting process, and the situation that the downhole falling fish falls again in the lifting process is avoided; and meanwhile, underground fallen fishes within a certain size range can be fished, and the fishing range is wide.

Description

technical field [0001] The invention relates to the technical field of downhole fishing, in particular to a multi-size radially tightenable fishing tool. Background technique [0002] According to the current exploration and development status, some easy-to-drill areas such as shallow buried depth, good geological structure, and few fractures have basically entered the late stage of development. In areas with complex pressure, and the wells drilled are getting deeper and deeper, and the well trajectory is becoming more and more complicated, horizontal wells have gradually become the mainstream. Drilling in such a harsh geological environment is very easy to induce downhole accidents, such as necking and extrusion of drilling tools in the process of drilling in salt-gypsum layers; moreover, the friction torque in the deflection section of some extended-reach wells is large , if you encounter difficult-to-drill sandy conglomerate, it is easy to wear the drilling tool and caus...

AI Technical Summary

Problems solved by technology

Drilling in such a harsh geological environment is very easy to induce downhole accidents, such as necking and extrusion of drilling tools in the process of drilling in salt-gypsum layers; moreover, the friction torque in the deflection section of some extended-reach wells is large , if you encounter difficult-to-drill sandy conglomerate, it is easy to wear the drilling tool and cause local damage, and it is more likely to break the drilling tool in the harsh environment of high temperature and high pressure; not only that, even if the drilling has been completed, logging and other During the field test, it is very easy to drop the measuring tool, causing fish falling down the well.

[0003] However, the current common fishing method in the field is mainly through casing milling, making silk and then taking it out, but the process is relatively slow and difficult; at the same time, this method can only salvage fish with a fixed shape and size. It is easy to get stuck when the tool is lowered, and it is more difficult to salvage fish with non-specific shapes; in addition, there is no locking device for tools that can catch fish from software such as cables, and it is easy to cause fish to fall during the lifting process drop

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