METHOD OF GAS-HYDRAULIC IMPACT ON FORMATION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC E21B43/263 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to a method and a device for increasing oil recovery of a productive formation, in particular to local hydraulic fracturing of a formation using a combustible charge. Method involves deep perforation in all intervals of the treated payout bed. Providing controlled frameless sectional charge combustion with central channel around core-resistant central element of downhole tool, such as rod, which is held at safe distance from combustion point and downhole instruments. At that, the central element of the deep shell is fixed to the casing with an anchor device before ignition of the charge sections. At that, removal of fixed condition of anchor device is performed automatically at the beginning of lifting of bottom-hole projectile as a result of fluid flow in hydraulic cylinder of anchor device. At that, the anchor device consists of a self-folding hook mechanism for its fixation to the well string, note here that central support element of anchor device is connected to projectile rod via piston of hydraulic cylinder to make time relay to retain anchor device in fixed position only for the time of charge combustion pulse.

EFFECT: technical result consists in improvement of safety and efficiency of local hydraulic fracturing of formation of large radius, estimated correction of parameters during subsequent actions and focusing of pressure pulse in exposure interval.

2 cl, 3 dwg