Process for plugging a subterranean formation

Details Process for plugging a subterranean formation Process for plugging a subterranean formation

E - Fixed Constructions

21

B

166/17

E21B 43/10 (2006.01)

Patent

CA 1233408

ABSTRACT OF THE DISCLOSURE Aqueous silicate solutions when admixed, inter- mingled or otherwise contacted with hydraulic cement slurries cause a very rapid gelation and accelerated setting of the hydraulic cement composition. It has now been discovered that this rapid gelation/accelerated setting phenomenon can be controlled and substantially delayed by incorporating a water soluble inorganic phosophate salt into an aqueous spacer fluid positioned between said silicate solution and said cement slurry as such materials are being sequentially injected into a subterranean formation.

492014

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