Low-confining-pressure perforator used for oil gas well

Abstract

The invention discloses a low-confining-pressure perforator used for an oil gas well. The low-confining-pressure perforator comprises a gun body, a gun carrier pipe and perforating bullets, and is characterized in that the gun body is in a hollow tubular shape, the perforating bullets are evenly arranged on the gun carrier pipe at intervals in the axial direction, the gun carrier pipe is sleeved with the gun body, blind holes are formed in the positions, opposite to the perforating bullets, of the outer surface of the gun body, and the two ends of the gun body are provided with a connector and a gun breech respectively so that the gun carrier pipe and the perforating bullets can be blocked in the gun body. The low-confining-pressure perforator is high in structural strength and toughness, the gun body can be effectively prevented from fractures caused by explosions when the perforating work is conducted under the low-confining-pressure condition, the energy loss is reduced through the structures of the arc-shaped blind holes when jet flow penetrates through the blind holes, the effective diameter of perforated holes is increased, the detonation wave energy can be more rapidly released out of the perforated holes, the impact effect of the detonation wave energy on the gun body is reduced, and the perforation completion effect is ensured.

Description

technical field [0001] The invention relates to perforation equipment in the technical field of oil production in oil fields, in particular to a low confining pressure perforator for oil and gas wells. Background technique [0002] The perforator is a tool used for well completion or cementing in the petroleum field. At present, the energy-shaping perforator is widely used, which uses the energy-gathering phenomenon of the explosion to generate the energy-gathering jet to penetrate the formation. [0003] In the traditional perforating completion operation, when the perforating gun is sent to the target layer, there is usually a certain level of well fluid between the outside of the perforating gun and the wellbore, which can ensure that the gun body is not damaged after the perforating gun is perforated to a certain extent. Explosion, no serious deformation, effectively avoiding engineering accidents. In recent years, with the rapid development of domestic oil and gas fiel...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve the existing technology, provide a low confining pressure perforator for oil and gas wells, and solve the problem of the traditional perforator in the current technology under the low confining pressure working environment. During the perforating operation, the perforating gun body is prone to bursting or serious deformation, which affects the completion of the well.

Images