Patent ID: 6063737
Filing Date: 2000-05-16
Classification: C09K,Y10S

Abstract:
A method for displacing a downhole fluid in a wellbore comprising displacing said downhole fluid by circulating an aqueous spacer fluid composition into the wellbore containing the downhole fluid, said aqueous spacer fluid composition comprising a mixture of:a) water;b) a polyoxyalkylene monool surfactant represented by the formula: ##STR7## wherein R.sub.1 is an aliphatic hydrocarbyl group having 8 to 24 carbon atoms, R.sub.2 is a C.sub.1 -C.sub.3 alkyl group, and the weight average of w+x is at least about 5; andc) a polyoxyalkylene monool surfactant represented by the formula: ##STR8## wherein R.sub.1 is an aliphatic hydrocarbyl group having 8 to 24 carbon atoms, R.sub.2 is a C.sub.1 -C.sub.3 alkyl group, and the weight average of y+z is about 1 to about 4.