FACILITY FOR NEAR-WELLBORE TREATMENT AND METHOD FOR NEAR-WELLBORE TREATMENT Russian patent published in 2008 - IPC E21B43/27 E21B43/25 

FIELD: mining.

SUBSTANCE: facility for near-well bore treatment includes an air chamber with atmospheric pressure, an orifice plate and an inlet chamber made of light elastic-plastic material. The latter is destroyed when hard gas-generating composition (HGC) placed therein and consisting of two parts is subjected to combustion. The first part of HGC is turned to the air chamber and made of combustible high-strength composition with low-gas escape (CHC). The second part of HGC is made of acid-generating composition (AGC) located to connect with CHC and equipped with a destructible calibrated orifice at the upper end of the inlet chamber. The facility includes a connected clutch furnished with openings for well fluid penetration, an air chamber with the length of 1.5-3 m, an additional inlet chamber, with CHC with igniter and calibrated polymer orifice placed therein, and an additional air chamber with length of 20-50 m, connected with aforesaid additional inlet chamber by means of a clutch. CHC is made of the following mixture, mass %: ammonium nitrate 30-40, potassium permanganate 5-10, epoxy compound - composition of resin "ЭД-20", plasticiser "ЭДОС" and hardener "АФ-2М 50-70". AGC is made of the following mixture, mass %: ammonium nitrate 12-16, potassium dichromate 1-3, barium nitrate 5-8, aluminum "АСД-1" 0.7-0.8, thermite ferro aluminum 14-16, hexachloran 20-30, polytetrafluoroethylene 20-30, aforesaid epoxy compound 5-10. The method for near-well bore treatment includes transmission of the said facility to the bottom hole by cable-rope; combustion and formation of maximum quantity of chemical agents with increased pressure within the range of processing; opening air chamber via calibrated orifice response to CHC combustion with realisation of hydraulic impact; technological holding for drastic reaction of hydrofluoric and hydrochloric acids evolved as a result of AGC combustion. Then, the said facility is descended; the connecting clutch thereof, furnished with openings, is located at the same level with processed layer. The next stage includes sequential actuating of CHC exerts disclosure of the additional air chamber as CHC is placed in the additional inlet chamber and contains igniter and destructible calibrated orifice with igniter response generated by electric pulse.

EFFECT: more effective near-well bore treatment.

2 cl, 2 ex, 1 dwg