Wells – Processes – Chemical inter-reaction of two or more introduced materials
Reexamination Certificate
2011-03-15
2011-03-15
Bates, Zakiya W (Department: 3676)
Wells
Processes
Chemical inter-reaction of two or more introduced materials
C166S294000, C166S295000, C175S064000
Reexamination Certificate
active
07905287
ABSTRACT:
Methods are provided for reducing the loss of a wellbore servicing fluid to a subterranean formation. A polymeric solution and an activator may be contacted in the formation, thereby forming a precipitate to at least partially block fluid from flowing further into the formation. The fluid may be, for example, a drilling fluid, a cement composition, a workover fluid, or combinations thereof. The polymeric solution may comprise a polyvinylpyrrolidone aqueous solution, and the activator may comprise a formate brine. In one embodiment, the polymeric solution and the activator are contacted before completing a drilling operation in the wellbore. In another embodiment, they are contacted before completing a primary cementing operation in the wellbore. In yet another embodiment, they are contacted before completing a secondary cementing operation in the wellbore. When desirable, the precipitate may be easily and quickly removed from the subterranean formation by dissolving it in fresh water.
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Oyler Kenneth W.
Thaemlitz Carl J.
Bates Zakiya W
Ditrani Angela M
Halliburton Energy Service,s Inc.
McDermott & Will & Emery
Roddy Craig W.
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