Patent ID: 6218342
Filing Date: 2001-04-17
Classification: C09K,E21B,Y10S

Abstract:
A method comprising(a) using a fluid comprisingi) an oleaginous fluid;ii) a non-oleaginous fluid; andiii) an amine surfactant having the structure ##STR3##wherein R is a C.sub.12 -C.sub.22 aliphatic hydrocarbon; R' is an independently selectable from hydrogen or C.sub.1 to C.sub.3 alkyl; A is NH or O, and 1.ltoreq.x+y.ltoreq.3, in the drilling, completion or workover of a well, wherein said fluid comes into contact with a producing formation; and(b) injecting an acid functionally able to protonate the amine surfactant into the well so as to reversibly convert the invert emulsion to a oil in water emulsion to facilitate the removal of the oil based filter cake thus cleaning-up or stimulating the well.