Electrically conductive non-aqueous wellbore fluids

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/36 (2006.01)

Patent

CA 2360375

A wellbore fluid having a non-aqueous continuous liquid phase that exhibits an electrical conductivity increased by a factor in order of 104 to 107 compared to conventional invert emulsion comprises from about 0.2 % to about 10 % by volume of carbon black particles, and one or more emulsifying surfactant(s) selected from the class including: nonionic emulsifiers of Hydrophilic- Lipophilic Balance (HLB) less than about 12, and anionic surfactants wherein the counter-ion (cation) is any of alkali metal, ammonium, or hydrogen ions. This wellbore fluid can be used for drilling or completing a well and can be used for providing enhanced information from electrical logging tools, measurement while drilling, logging while drilling, geosteering and the like.

Fluide de forage à phase liquide continue non aqueuse, qui présente une conductivité électrique augmentée d'un facteur de l'ordre de 10?4¿ à 10?7¿ par rapport aux émulsions inverses classiques et contient d'environ 0,2 % à environ 10 % en volume de particules de noir de carbone et un ou plusieurs tensioactifs émulsifiants choisis dans la classe composée des émulsifiants non ioniques à rapport hydrophile-liphophile (HLB) inférieur à environ 12 et des tensioactifs anioniques dans lesquels les contre-ions (cations) sont des ions de métal alcalin, d'ammonium ou d'hydrogène. Ledit fluide peut être utilisé pour forer ou pour compléter un puits et peut également être utilisé pour fournir des informations améliorées provenant d'outils de diagraphie électriques, des mesures en cours de forage, la diagraphie en cours de forage, le géoguidage et analogues.

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