SU133839A1 - Ring shaped pipe cutter - Google Patents

Description

HsBiecTHbie pipe cutters with annular shaped charge require additional powder charge to push the fluid out of the space by a cumulative circular charge and the wall of the pipe being cut.

In the proposed annular cumulative bore pipe cutter, a reactive chamber is used, through the nozzles of which the powder gasses are displaced, pushing the liquid aside.

The drawing shows the principal constructive cxe.vna of the proposed pipe cutter.

Reactive chambers: a 1 cover 2 and in which a few holes are arranged symmetrically around the circumference and 5 in the form of nozzles. The reactor chamber is filled with tubular powder 5, for ignition} of which pyropatrH 7 and the igniter 8 are used in a sealed aluminum shell. The nozzles 5 in the lower lid 3 are set at an angle to the chamber axis to reliably fluidize the fluid without damaging the charge 5. The nozzles 4 in the upper lid 2 are designed to compensate for the axial force from the action of the nozzles 5. The remote tube 10 and the detonator cap 11 The pipe cutter is launched into the well 1 on a single core logging tool. 1 armored cable type CODB.

When a current pulse is applied from the surface of the earth, the squib, igniter, distance tube - and main powder charge ignite. The distance of the distance tube is calculated so that by the time of fluid discharge by the gas near the charge: the detonator capsule and the annular cumulative charge trigger yes, cutting the casing 12.

A pipe cutter can be used for pre-cutting by cutting. rocks are charged when the formation is being prepared for hydraulic fracturing.

Subject invention

An annular shaped tube cutter, characterized in that, in order to increase the efficiency of the shaped ring charge, when there is a radial clearance between the pipe cutter and the tube, it is provided with an arrangement above the ring: , an igniter, a remote tube with a primer-detonator and nozzles built into the chamber lid; moreover, the lids are designed for directing the powder gas gases B, the radial clearance, and the nozzle, the l. the axis of the camera.