申请人:Jones Gareth John Timothy
公开号:US20070197404A1
公开(公告)日:2007-08-23
A wellbore fluid comprising a surfactant, the surfactant having the formula (R
1
—X)
n
Z, wherein R
1
is an aliphatic group—comprising a C
18
-C
22
principal straight chain bonded at a terminal carbon atom thereof to X, and comprising at least one C
1
-C
2
side chain—X is a charged head group, Z is a counterion, and n is an integer which ensures that the surfactant is charge neutral, and wherein the charged head group X is selected to provide that the surfactant is soluble in oil and at least one part of the charged head group is anionic.