Underground short cable cutter and use method for same

Abstract

The invention discloses an underground short cable cutter and a use method for the same and belongs to the technical field of petroleum logging. The underground short cable cutter comprises a connecting part and a cutting part, wherein the cutter is connected to an upper instrument string by the connecting part during salvage of a jammed instrument; an end part of the jammed instrument is led intoa blind hole via a shoe guide face; the end part of the jammed instrument is sleeved by the blind hole; an acting scope of a short cable at the end part of the jammed instrument inside a cutting faceand the shoe guide face is adjusted; and when force is applied by the upper salvage instrument string, the short cable at the end part of the jammed instrument can be cut by a cutting blade, so influences brought by the short cable left in a shaft to subsequent salvage operations can be solved fundamentally on the premise that the jammed instrument is not destroyed. The device has rational structural design, increases efficiency and the success rate of salvage and saves cost.

Description

technical field [0001] The invention belongs to the technical field of petroleum well logging, and in particular relates to a downhole short cable cutter and a using method thereof. Background technique [0002] At present, in the process of lifting and lowering the instrument (or tool) through the cable (or steel wire) during the logging or testing process of the production well, due to reasons such as well conditions or construction operations, the instrument (or tool) is stuck. The cable (or steel wire) tends to be broken. The cables (or steel wires) left in the shaft sometimes have short cables (or steel wires), such as figure 2 , this situation will bring difficulties to later salvage operations. This is because when fishing with a conventional inner spear or an outer spear for fishing operations, the cable (or steel wire) left in the wellbore is relatively short and cannot be wound on the claws, resulting in failure of the fishing operation. If a slip overshot or th...

AI Technical Summary

Problems solved by technology

The cables (or steel wires) left in the shaft sometimes have short cables (or steel wires), such as figure 2 , this situation will bring difficulties to later salvage operations

This is because when the conventional inner fishing spear or outer fishing spear is used for fishing operations, the cables (or steel wires) left in the wellbore are short and cannot be wound on the spear claws, resulting in the failure of the fishing operation

If a slip overshot or three-ball overshot is used for fishing, due to the short cable (or steel wire), the slip overshot or three-ball overshot cannot successfully catch the fishing head or main body of the falling instrument (or tool) , affecting the success rate of salvage

If destructive fishing operations such as core-piercing fishing are used, although the success rate of the fishing operation can be improved, it will cause and structural damage to the instrument (or tool) that fell into the well. Damaged and cannot be used again, increasing the cost of salvage

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