PROCESS OF PREPARATION OF BOTTOM HOLE ZONE BEFORE ACIDIZING Russian patent published in 2003 - IPC

FIELD: oil and gas industry, intensification of inflow of oil and gas. SUBSTANCE: process of preparation of bottom hole zone before acidizing includes flushing of well and formation of protective film coat on metal surfaces. This preparation is carried out in one stage with utilization of multifunctional sludge with following proportion of components, per cent by mass: water 81.3; sodium-carboxylmethylcellulose 2.1; butethal 0.3, reagent Polycil solved in kerosene 16.3. EFFECT: increased quality of preparation of bottom hole zone with simultaneous reduction of expenses for work. 1 tbl