Electrically conductive oil-based mud

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/32 (2006.01) E21B 47/00 (2006.01) G01V 3/20 (2006.01) G01V 3/24 (2006.01)

Patent

CA 2456351

An electrically conductive oil mud meeting the fluid requirements for resistive logging tools and a method for preparing such mud is disclosed. The fluid has been optimized to deliver performance in a manner as similar to that of a traditional invert emulsion drilling fluid as is practical while still maintaining the required electrical conductivity for resistivity-based logging tools. This electrically conductive oil-based mud comprises a polar synthetic ester base and complimentary ester surfactants, one being more oil soluble, the other being more water soluble. The surfactants interact synergistically to provide dense packing of micelles at the palisade layer. This fluid is oil- wetting to solids, and in general behaves like a traditional oil mud.

Boue huileuse conductrice d'électricité répondant aux exigences fluidiques d'instruments de diagraphie de résistivité et procédé servant à préparer cette boue. Ce fluide a été optimisé de manière à traduire une capacité similaire à celle d'un fluide de forage classique basé sur une émulsion inverse, tout en conservant la conductivité électrique nécessaire pour des instruments de diagraphie basée sur la résistivité. Cette boue huileuse conductrice est composée d'une base d'ester synthétique polaire et de tensioactifs complémentaires estérifiés, l'un étant davantage soluble dans l'huile et l'autre dans l'eau. Ces tensioactifs exercent un effet synergique afin de produire une quantité dense de micelles au niveau de la couche de palissade. L'huile contenue dans ce fluide pénètre dans les solides et il se comporte généralement de la même manière qu'une boue huileuse classique.

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