| US 7,517,836 B2 | ||
| Defoaming methods and compositions | ||
| Jiten Chatterji, Duncan, Okla. (US); and Bobby J. King, Duncan, Okla. (US) | ||
| Assigned to Halliburton Energy Services, Inc., Duncan, Okla. (US) | ||
| Filed on Mar. 07, 2007, as Appl. No. 11/683,248. | ||
| Prior Publication US 2008/0220994 A1, Sep. 11, 2008 | ||
| Int. Cl. C09K 8/86 (2006.01) | ||
| U.S. Cl. 507—244 [507/261; 507/265; 507/266; 507/269] | 23 Claims |
| 1. A method of defoaming a well treatment fluid, comprising:
providing a defoaming composition comprising an amide of a carboxylic acid, a polypropylene glycol, an ethoxylated and propoxylated
fatty alcohol, an ethoxylated alcohol comprising from 3 carbons to 6 carbons, and a hydrophobic silica in an amount of up
to about 3% by weight of the defoaming composition;
recovering the well treatment fluid from a subterranean formation;
combining the defoaming composition with the well treatment fluid, wherein the well treatment fluid is recovered from the
subterranean formation prior to combination with the defoaming composition.
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