Methods of reducing fluid loss in a wellbore servicing fluid

Details Methods of reducing fluid loss in a wellbore servicing fluid Methods of reducing fluid loss in a wellbore servicing fluid

2007-03-27

2007-03-27

Gulakowski, Randy (Department: 1712)

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

C507S123000, C507S141000, C507S226000, C507S229000, C507S277000, C507S935000, C166S295000

Reexamination Certificate

active

10733059

ABSTRACT:
Methods of reducing the fluid loss from a wellbore servicing fluid include combining a terpolymer with the wellbore servicing fluid to reduce the fluid loss from the fluid, followed by displacing the fluid into a wellbore. In an embodiment, the following monomers are used to make the terpolymer: from about 75 wt. % to about 95 wt. % of 2-acrylamido-2-methylpropanesulfonic acid or an alkali salt thereof; from about 3 wt. % to about 15 wt. % of acrylamide; and from about 3 wt. % to about 15 wt. % of N-vinyl-2-pyrrolidone, all weight percentages being based on a total weight of the monomers. The wellbore servicing fluid may comprise water or an aqueous salt solution such as a formate solution. The wellbore servicing fluid may also comprise clay such as montmorillonite and attapulgite clay.

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International Search Report and Written Opinion of the International Searching Authority, PCT/US2004/037007, Jan. 4, 2005, 12 pgs.

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