PROCEDURE FOR MULTIPLE HYDRAULIC FRACTURING OF HORIZONTAL BOREHOLE OF WELL Russian patent published in 2009 - IPC E21B43/267 C09K8/90 

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil and gas industry, particularly, to hydraulic fracturing of horizontal borehole of well. The procedure of multiple hydraulic fracturing of horizontal borehole of well consists in generating fractures successively in various intervals of a producer exposed with the horizontal borehole of the well by means of assembling a packer, and in pumping fluid of hydraulic fracturing via a filter installed in each part of the horizontal borehole corresponding to each of these intervals; also the rest parts are insulated; notably, the packer is installed in the vertical borehole of the well; initially hydraulic fracturing is carried out in the interval of the reservoir with the highest penetrability by supplying fluid-carrier with proplant; a "head" of the proplant plug is fixed and it shuts off a corresponding section of the horizontal borehole between filters; the corresponding filters are insulated by forming a polymer crust on them; the said operation is repeated on each of the rest intervals successively according to the degree of their penetrability drop; preliminary crust is removed off the filter corresponding to this interval; also polymer crust is formed by means of supplying a composition into well; the said composition has the following ratio of components, wt %: gel former-bio-polymer 0.5-10, potassium chloride -0.5-12, biocide - 0.1-5, demulsifier 0.1-10, cross-linking agent - 0.1-1.5, water - the rest; the crust is removed with liquid-solvent, where contents of gel destroyer is 0.6-1.2 kg/m³ of water.

EFFECT: simplification and reduced duration of process.

1 ex, 2 dwg