METHOD OF FORMING CONDUCTING CRACKS IN PRODUCTIVE FORMATION BEHIND WELL CASING Russian patent published in 2016 - IPC E21B43/117 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas production, in particular, to a method of forming in saturated rocks behind a well casing cracks, conducting liquid. Method of forming conducting cracks in productive formation behind a well casing includes creation of an undercut in rock by fan shooting of selective cumulative perforator with separate cumulative charge in every isolated section with successive section-by-section combination of cumulative charges with plane, perpendicular to well axis and rotation of each subsequent charge, loading shores undercut with pulse hydraulic fracturing pressure. Selective perforator uses cumulative charge forming in deposit rock a diverging channel, and when loading shores undercut with pulse pressure, two cracks form: conical and radial-circular, propagating from outer boundary of undercut into rock with partial fixation of fractures of crushed rock from undercut zone. Inclination angle of generatrix of conical fracture to well axis is (45+Δ)°, where Δ is angle increment, proportional to intensity of application of pulse pressure.

EFFECT: higher quality of operations.

6 cl, 7 dwg