Method of cleaning a well bore prior to installing a water...

E - Fixed Constructions – 21 – B

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E21B 37/06 (2006.01) C09K 8/52 (2006.01)

Patent

CA 2366355

A non-aqueous system for cleaning a section of a subterranean well bore and installing a water based fluid system into the well bore. The well bore may be an open hole or contain a casing string therein. A series of spacer fluids are introduced into the well bore to displace the drilling fluid in order to clean and water wet the section of well bore. In the preferred embodiment, three spacers are pumped into the well bore including a first spacer containing a solvent, a second spacer containing a solvent and a third spacer containing a surfactant. A water based fluid system may thereafter be introduced into the well bore. The water based fluid system will be a completion fluid in the preferred embodiment.

Cette invention concerne un système non aqueux pour le nettoyage d'une section de puits de forage et la mise en place d'un système fluidique à base d'eau dans ledit puits. Ce puits peut être un trou non tubé ou comporter une colonne de cuvelage. Dans le puits de forage, on injecte une série de fluides tampons pour repousser le fluide de forage et nettoyer et mouiller à l'eau une partie du puits. Selon un mode de réalisation préférée, on pompe trois fluides tampons dans le puits de forage pour repousser le fluide de forage, soit : un premier fluide tampon contenant un solvant, un deuxième fluide tampon contenant également un solvant et un troisième fluide tampon renfermant un tensioactif. On peut ensuite mettre en place un système fluidique à base d'eau dans le puits de forage. Selon le mode de réalisation préféré, le système fluidique à base d'eau peut être constitué par un fluide de complétion.

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