US 7,320,952 B2
Additive for viscoelastic fluid
Yiyan Chen, Richmond, Tex. (US); and Jesse C. Lee, Sugar Land, Tex. (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, Tex. (US)
Filed on Jan. 12, 2005, as Appl. No. 11/33,651.
Claims priority of provisional application 60/538025, filed on Jan. 21, 2004.
Prior Publication US 2005/0155762 A1, Jul. 21, 2005
Int. Cl. C09K 8/588 (2006.01)
U.S. Cl. 507—240  [507/241; 507/255; 507/260; 507/261; 507/266; 507/267; 166/282] 6 Claims
OG exemplary drawing
 
1. An aqueous oilfield treatment composition comprising a viscoelastic surfactant and from 0.005% to 0.075% of a co-gelling agent wherein said viscoelastic surfactant comprises erucylamidopropyl betaine and said co-gelling agent comprises H(CH2)xCO(OCH2CH2)yOCO(CH2)zH wherein x=z=12 and y=32.