Deep water completions fracturing fluid compositions

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/68 (2006.01) C09K 8/70 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2621781

It has been discovered that fracturing fluid compositions can be designed for successful deep water completion fracturing fluid operations. These fluids must be pumped relatively long distances from offshore platforms to the reservoir, and they are often subjected to a wide temperature range. Under these conditions, it is necessary to inhibit the formation of gas hydrates in the fracturing fluid compositions, as well as to delay the crosslinking of the gels that are formed to increase the viscosity of the fluids prior to fracturing the formation. Preferably, two different gas hydrate inhibitors are used to ensure placement of a gas hydrate inhibitor in most parts of the operation. In addition, as with all offshore or deep water hydrocarbon recovery operations, it is important that the components of the fracturing fluid compositions be environmentally benign and biodegradable.

Selon l'invention, des compositions liquides de fracturation peuvent être mises au point pour réaliser avec succès des opérations de fracturation de complétion en eau profonde. Ces liquides, qui doivent être pompés sur des distances relativement longues, de la plate-forme de forage en mer au réservoir, sont souvent exposés à une large gamme de températures. Dans ces conditions, il est nécessaire d'inhiber la formation d'hydrate de gaz dans les compositions liquides de fracturation, ainsi que de retarder la réticulation des gels constitués pour augmenter la viscosité des liquides préalablement à la fracturation de la formation. De préférence, deux inhibiteurs d'hydrate de gaz différents sont utilisés pour assurer le placement d'un inhibiteur d'hydrate de gaz dans la majeure partie des étapes du processus. De plus, comme pour toutes les opérations de récupération pétrolière au large ou en eau profonde, il est important que les constituants des compositions liquides de fracturation aient un impact négligeable sur l'environnement et soient biodégradables.

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