Method of using lignite grafted fluid loss control additives...

Details Method of using lignite grafted fluid loss control additives... Method of using lignite grafted fluid loss control additives...

2008-04-22

2008-04-22

Bates, Zakiya W. (Department: 3676)

Wells

Processes

Cementing, plugging or consolidating

C166S282000

Reexamination Certificate

active

11702342

ABSTRACT:
Methods of cementing in a subterranean formation are provided. An exemplary embodiment comprises introducing a cement composition into a subterranean formation. The cement composition comprises water, a cement and a fluid loss control additive comprising a graft polymer. The graft polymer comprises a backbone comprising a lignite. The graft polymer further comprises grafted monomers selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid, vinylphosphonic acid, diallyldimethylammonium chloride and salts thereof.

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