Method and composition for the triggered release of...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/536 (2006.01) C09K 8/524 (2006.01) C09K 8/588 (2006.01) C09K 8/92 (2006.01) E21B 37/06 (2006.01) E21B 43/25 (2006.01) C09K 8/76 (2006.01)

Patent

CA 2390647

Disclosed are methods and related compositions for altering the physical and chemical properties of a substrate used in hydrocarbon exploitation, such as in downhole drilling operations. In a preferred embodiment a method involves formulating a fluid, tailored to the specific drilling conditions, that contains one or more inactivated enzymes. Preferably the enzyme is inactivated by encapsulation in a pH responsive material. After the fluid has been introduced into the well bore, one or more triggering signals, such as a change in pH, is applied to the fluid that will activate or reactivate the inactivate enzyme, preferably by causing it to be released by the encapsulation material. The reactivated enzyme is capable of selectively acting upon a substrate located downhole to bring about the desired change in the chemical or physical properties of the substrate.

L'invention concerne un procédé et une composition permettant de modifier les propriétés physiques et chimiques d'un substrat utilisé dans l'exploitation des hydrocarbures, notamment des opérations de forage de fonds de puits. Selon un mode de réalisation préféré, le procédé consiste à préparer un fluide adapté aux conditions spécifiques de forage contenant au moins une enzyme inactivée. Cette enzyme est, de préférence, inactivée par encapsulation dans un matériau sensible au pH. Une fois que le fluide a été introduit dans le puits de forage, au moins un signal de déclenchement, tel qu'une modification du pH, est appliqué audit fluide qui active ou réactive l'enzyme inactivée, de préférence par libération de l'enzyme du matériau d'encapsulation. L'enzyme réactivée peut agir sélectivement sur un substrat situé en fonds de trou afin d'entraîner la modification désirée des propriétés physiques ou chimiques dudit substrat.

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