Thermosetting well treatment composition

Details Thermosetting well treatment composition Thermosetting well treatment composition

E - Fixed Constructions

21

B

E21B 33/138 (2006.01)

Patent

CA 2175144

An acid soluble, water impermeable, inorganic, thermosetting composition for use in sealing an underground permeable zone. The composition includes about 38% by weight magnesium oxide, about 38% magnesium sulphate trihydrate, and about 24% inert filler, or about 35.8% by weight magnesium oxide, about 41.5% magnesium sulphate trihydrate, and about 22.7% inert filler, the inert filler being selected from the group comprising calcium carbonate and dolomite, and the aqueous solution being magnesium chloride solution. The amount of aqueous liquid, magnesium oxide, magnesium sulphate and inert filler is selected such that the composition has an exponential setting curve at the temperature T. The composition is mixed and injected into a well bore adjacent the zone through tubing to fill the well bore adjacent the zone. Tubing is removed from adjacent the zone; and the composition is allowed to set at least adjacent the zone.

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