Patent ID: 6806233
Filing Date: 2004-10-19
Classification: C09K,E21B

Abstract:
A method of electrically logging a subterranean well, the method comprising:a) drilling the subterranean well with an invert emulsion drilling fluid, wherein said fluid includes: an oleaginous fluid; a non-oleaginous fluid; and an amine surfactant having the structure â€ƒwherein R is a C12-C22 aliphatic hydrocarbon; Râ€² is an independently selectable from hydrogen or C1 to C3 alkyl; A is NH or O, and 1&lE;x+y&lE;3; b) adding acid to the invert emulsion drilling fluid in a sufficient amount to reverse the filtercake solids from being oil-wet to being water-wet; and c) electrically logging said well.