SU1111528A1 - Cumulative perforator - Google Patents

Description

The invention relates to a space-explosive apparatus for working in oil and gas wells, and specifically to cumulative perforators for opening reservoirs.

A cumulative perforator is known, containing a cumulative charge with lining, a detonating cord, two tubes filled with a binder, and a duplicate detonating cord.

The disadvantage of this perforator is the insufficient detonation power of the tubes (due to the small weighed amount of vpered substances (HE) installed; in the tail section of the charge checker) for an; reliable detonation transmission to the detonating w} gur, especially in unpackaged

perforators due to the need for the charge housing and in perforators with a heat resistance above 180–200 ° C, where low-power and low-sensitivity explosives are used and the means of explosive blowing are used. .

The disadvantage is also the difficulty of pressing the tube with an explosive in the tail part of the charge and especially its orientation relative to the location of the detonating cord.

The closest technical solution is a cumulative perforator, containing a perforator, containing a cumulative charge with the lining and sheath, detonating the cord, contacting with the side surface of the tail part of the charge, an additional charge.

located behind the shell installed close to the shell between the point of contact of the detonating cord and the top of the cladding with a detonation output of additional charge along the cladding axis made of a material that does not conduct detonation poorly.

A disadvantage of a cumulative perforator is the low reliability of the initiation of detonation and the complexity of the design.

The aim of the invention is to increase the reliability of detonation and simplify the design.

This goal is achieved by the fact that in a cumulative perforator containing a cumulative charge with a lining and a shell, a detonating cord of contacting with the side surface of the tail part of the charge, an additional charge, located behind the shell that is installed close to the shell between the point of contact of the detonating cord and the tip of the barriers 1 a screen with a detonation output of additional charge along the axis of the cladding, made of a material that poorly conducts detonation; the screen is designed as an annular diaphragm with an axial hole and laid coaxially facing.

FIG. 1 shows a cumulative perforator; in fig. 2 is a cross section aa of a perforator.

The cumulative perforator is varied from the shell 1, sealed with the help of cover 2, cumulative charge 3 with lining 4, screen 5 and detonation-. 6, in contact with the side surface of the tail part -. p yes ..

In order to increase the reliability, a duplicate cord 7 with a detonation output of an additional charge 8 along the axis of the lining 4 is installed symmetrically with the cord 6, and the screen 5 is made of poorly conducting detonation material. The detonating cords 6 and 7 are in contact with the side surface of the tail section of the charge.

Detonation from the cord 6 (or 7) rep

given in the plane of the point of contact of the explosive charge, while the detonation wave front does not drift parallel to the axis of the lining 4. Passing through the center of the screen aperture 5, the detonation front changes direction and becomes coaxial with the lining 4.

Upon further movement of the front, the facing 4 collapses symmetrically and forms a cumulative jet that pierces the bottom 2 and creates a perforation channel in the borehole wall. At the same time, detonation products in the space between the bottom of the shell and the diaphragm perform a useful role: they prevent the explosion products from flying near the facing, thereby facilitating the collapse of the facing.

Thus, by making the screen in the form of an annular diaphragm with an axial hole and installing it coaxially with the lining, detonation in charge under the screen can be more reliably initiated both from the detonating cord and transferred to the other cord to trigger an explosion in the next charge (for by increasing the mass of the charge and accelerating the detonation under conditions of limiting the amount of charge by the body and the screen).

In addition, the implementation of the screen in a circular diaphragm with an axial bore allows us to remove the question of the orientation of the detonating cord relative to the charge.

The penetration ability of cumulative charge also increases due to the additional deceleration of explosion products in the tail direction due to the screen in the form of an annular diaphragm.

FIG. 2

Claims (1)

CUMULATIVE PERFORATOR containing a cumulative charge with a liner and a shell, detonating _h . a cord in contact with the lateral surface of the tail of the charge, an additional charge located behind the detonating cord contact point and the top of the cladding installed adjacent to the shell with the shield detonating exit of the additional charge along the cladding axis, made of a material that does not conduct detonation well, characterized in that, in order to increase the reliability of detonation excitation and simplify the design, the screen is made in the form of an annular diaphragm with an axial hole and is installed coaxially to the cladding.