A kind of underground short cable cutter and using method thereof

Abstract

The invention discloses a downhole short cable cutter and a using method thereof, which belong to the technical field of petroleum well logging. Including the connecting part and the cutting part, when salvaging the jammed instrument, it is connected in series with the upper instrument through the connecting part, and the end of the jammed instrument is guided into the blind hole through the guide shoe surface, and the blind hole is set on the end of the jammed instrument. The short cable at the end of the stuck instrument enters the range of action of the cutting surface and the boot surface. When the force is applied by the upper salvage instrument string, the cutting edge can cut off the short cable at the end of the stuck instrument, so as not to damage the stuck instrument. Fundamentally solve the impact of the short cable remaining in the wellbore on the subsequent fishing operation under the premise of this method. The structure design of the device is reasonable, the efficiency and success rate of the salvage work are improved, and the cost is saved.

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

Images