Releasing pup joint for horizontal well conveying tractor perforation tool

Abstract

The invention relates to a releasing pup joint for a horizontal well conveying tractor perforation tool. The releasing pup joint consists of an upper joint assembly and a lower joint assembly, whereinan upper joint of the upper joint assembly is screwed with an outer pipe; a connection sleeve located in the outer pipe is connected with the upper joint through guide keys; locking slots are formedin the connection sleeve; the lower joint assembly is provided with locking claws for locking the locking slots of the upper joint assembly; the locking claws are fixed on a lower joint through screwpins; and the locking claws are uniformly distributed between a salvaging head and the lower joint. During construction of horizontal well perforation, the releasing pup joint is mounted on a rotary pup joint of the horizontal well conveying tractor perforation tool; when the tractor perforation tool is locked in a well, a releasing instruction is sent from the ground; the locking claws are separated from the locking slots, and the upper joint assembly slides off from the lower joint assembly and is lifted out of a wellhead through a cable; and the lower joint assembly is retained on the tractor perforation tool. An assorted salvaging tool is connected with the salvaging head of the lower joint assembly to take the tractor perforation tool out of the wellhead.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering perforation, in particular to a hand-off nipple used for a perforating tool of a horizontal well conveying tractor. Background technique [0002] During the perforating operation of the tractor, due to factors such as the working environment and equipment failure, jamming accidents may occur. In the past, jamming accidents were mainly done by lifting up multiple times or setting weak points to break the jamming. The former is likely to cause cable accidents. The cable breaks, causing the cables to accumulate irregularly in the well, which brings great difficulties to the salvage work, the salvage process is complicated, and the equipment is also damaged to a certain extent; the latter is not necessarily separated at the weak point of the design due to the uneven stress on the cables in the horizontal well , and there is also a risk that the abnormally severe impact during perforation...

AI Technical Summary

Problems solved by technology

[0002] During the perforating operation of the tractor, due to factors such as the working environment and equipment failure, jamming accidents may occur. In the past, jamming accidents were mainly done by lifting and pulling up multiple times or setting weak points to break the jam. The former is likely to cause cable accidents. The cable breaks, causing the cables to accumulate irregularly in the well, which brings great difficulties to the salvage work, the salvage process is complicated, and the equipment is also damaged to a certain extent; the latter is not necessarily separated at the weak point of the design because of the uneven stress on the cables in the horizontal well , and there is also a risk that the abnormally severe impact of the perforation will break or damage it, resulting in an accident

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