Method and composition for scavenging sulphide in drilling...

C - Chemistry – Metallurgy – 01 – G

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C01G 49/12 (2006.01) C09K 8/035 (2006.01) C09K 8/12 (2006.01)

Patent

CA 2379897

An environmentally friendly method and composition is provided for removing hydrogen sulphide from fluids at high pH. The method and composition are particularly suited for removing hydrogen sulphide from drilling fluids used in drilling boreholes in hydrocarbon bearing subterranean formations, and are suitable for use with any drilling fluid, including polymer based drilling fluids. The sulphide scavenger used in the method and composition is a ferrous gluconate, an organic iron chelating agent stable at pH as high as 11.5, the pH preferred for drilling fluids that may encounter hydrogen sulphide. Further, this additive has been found to enhance the resilience of the rheological properties of drilling fluids to hot rolling and comparable field conditions.

L'invention concerne un procédé et une composition non polluants destinés à l'extraction d'hydrogène sulfuré à partir de liquides présentant un pH élevé. Lesdits procédé et composition sont notamment adaptés à l'extraction d'hydrogène sulfuré à partir de liquides de forage utilisés dans des trous de forage creusés dans des formations sous-terraines contenant des hydrocarbures, et peuvent être utilisés avec n'importe quel liquide de forage, par exemple avec des liquides de forage polymériques. L'agent de piégeage de sulfure utilisé dans ce procédé et dans cette composition est un gluconate ferreux, un agent chélateur de fer organique stable à un pH de 11,5, valeur optimale pour les liquides de forage susceptibles d'entrer en contact avec de l'hydrogène sulfuré. Par ailleurs, on a découvert que cet additif augmente la résistance des propriétés rhéologiques des liquides de forage au laminage à température élevée et aux conditions naturelles analogues.

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