METHOD OF FORMATION BREAKDOWN Russian patent published in 2008 - IPC E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to mining and can be used to increase production ability of well at extraction of water, oil and gas. The invention facilitates increased efficiency of the method owing to control over the process of breakdown and formation of a continuous crevice with a big opening and uniform filling of stabilising material. The essence of the invention is as follows: the method assumes formation of the crevice through a well and supply of the stabilizing material into the crevice. According to the invention the stabilising material is supplied into the well in mixture with plastic substance. The crevice is formed of preset dimensions with a breakdown border not going beyond the bottom hole of the well by means of driving the mixture of a specified volume from the well into the formation. After that a pipe is installed in the well; and the well is pressurised at the location of mixture in the crevice. Liquid is pumped into the gap between the pipe and well walls; the plastic substance is washed off the mixture through the zone between the borders of the mixture and the crevice and through the pipe.

EFFECT: increased efficiency of method owing to control over process of breakdown and formation of continuous crevice with big opening and uniform filling of stabilising material.

3 cl, 2 dwg