Methods of reducing the impact of a formate-based drilling...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 22/06 (2006.01) C09K 8/467 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2572658

A cement slurry comprising a base for reducing the impact of an alkaline solution may be displaced into a wellbore and allowed to set. The base may comprise a metal carbonate that is soluble in water such as potassium carbonate. The cement slurry may further include cement, water, and a salt that is soluble in the water such as potassium chloride. The alkaline solution may be present in a formate-based drilling fluid displaced into the wellbore ahead of the cement slurry. Despite being contacted by such an alkaline solution, the thickening time of the cement slurry is long enough and the set time is short enough to provide for the formation of an impermeable mass in the annulus of the wellbore. The thickening times may range from about 4 hours to about 16 hours, and the set times may be less than about 24 hours.

L'invention concerne un procédé permettant de cimenter un puits à l'aide d'un laitier de ciment, comprenant une base qui permet de réduire l'impact d'une solution alcaline, pouvant être déplacé dans ledit puits et pouvant prendre. Cette base peut comprendre un carbonate de métal soluble dans l'eau, tel qu'un carbonate de potassium. Le laitier de ciment peut également comprendre du ciment, de l'eau et un sel soluble dans l'eau, tel qu'un chlorure de potassium. La solution alcaline peut être présente dans un fluide de forage à base de formiate déplacé dans le puits en amont du laitier de ciment. Bien que le laitier de ciment soit en contact avec la solution alcaline, sa durée d'épaississement est suffisamment longue et la durée de prise est suffisante courte pour fournir à la formation une masse imperméable disposée dans l'anneau du puits. Les durées d'épaississement peuvent aller d'environ 4 heures à 16 heures, les durées de prise pouvant être inférieures à environ 24 heures.

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