METHOD OF THERMAL-GAS-DYNAMIC ACTION ON FORMATION AND SOLID PROPELLANT CHARGE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC E21B43/263 E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be used to influence the bottomhole zone. At actuation of igniter 4, non-armored powder element 2 is ignited and burnt, forming the first pulse of increased pressure due to fast surface burning of non-armored powder element 2. Pressure from formed gaseous combustion products of powder element 2 is transmitted through through holes 6 in charge housing 1 to bottomhole zone of the well for initial opening of formation cracks. During combustion of upper non-armored powder element 2 armored powder element 3 located below upper non-armored powder element 2 is ignited. Ignition of powder element 3 begins with truncated cone 8 and spreads along surface of central channel 10 from center of powder element 3 to its peripheral surface coated with layer 9 of fluorocarbon powder. Thus on one side process of progressive burning of armored powder element is formed, and on the other side, there is a process of slowing down the burning rate of solid-propellant charge, which only leads to maintaining pressure of gaseous combustion products of powder elements inside housing 1, without increasing its pulse (pressure value). Then process of successive alternation of surface burning of non-armored and progressive burning of armored elements of charge is repeated, thus pulsation of increased excessive pressure of gaseous combustion products of powder elements to formation is formed. At burning of unarmored 2 and armored 3 powder elements high temperature (over 600 °C), which leads to thermal decomposition of fluorocarbon powder from reservation layer 9 with subsequent formation of hydrofluoric acid, which increases intensity of melting solid deposits of asphalt-resinous and paraffin substances in well and bottom-hole zone of well.

EFFECT: technical result is higher efficiency of treatment of bottomhole formation zone.

2 cl, 1 dwg