Chain-type body-free perforator

Abstract

The invention relates to the technical field of oil and gas well through-tubing perforation operation, in particular to a chain-type body-free perforator. The chain-type body-free perforator includesat least one bullet holder, wherein perforating bullets are installed on the bullet holders, the perforating bullets comprise shell bodies and shell covers, the shell bodies are connected with the shell covers to form bullet shells with sealed inner cavities, the inner cavities of the bullet shells are filled with explosives, and the explosives are compacted through shaped charge liners installedin the inner cavities of the bullet shells. The chain-type body-free perforator has the beneficial effects that the structures of the bullet shells are simple, disassembly and assembly are convenient,end face sealing is carried out by the shell covers, connection and sealing of the shell bodies and the shell covers are realized through extrusion deformation force between the shell bodies and theshell covers, and performance is reliable; the independent bullet holders serve as carriers of the perforating bullets, the number and the phase position of the perforating bullets are flexibly set conveniently according to needs, all the bullet holders are arranged independently and are not prone to being clamped in casing pipes, moreover, the bullet holders can be broken into fine particles completely after perforation of the perforating bullets, after perforation is finished, the bullet holders do not need to be taken out again, occurrence of the well jamming accident is avoided, and safetyperformance is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas well perforating through oil pipes, in particular to a chain-type perforator without a barrel. Background technique [0002] Through-tubing perforation means that the perforator goes down through the tubing to the perforated section, and performs perforation in the casing. It is often used for oil testing, slim holes, and dealing with downhole accidents. Perforators are divided into two categories, one is the perforator with the gun body, and the other is the perforator without the gun body. Compared with the perforator with the gun body, under the same design size, the design space of the perforating bullet itself is larger, and the penetration depth and aperture are better, but it does not have the protection of the gun body. The whole perforator is completely in contact with the well fluid and has low pressure resistance. Therefore, the sealing requirements for perforating bullets without...

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a chain-type barrelless perforator, which is used to solve the complex structure of the perforator in the prior art, the difficulty of passing through the conveying process, and the easy deformation of the bullet holder. Stuck in the casing, poor safety performance

Images