| 摘要 |
<p>Wellbore-cleaning compositions comprising microemulsions are useful during cementing operations. The microemulsion solvent may be selected from the group comprising aliphatic solvents and glycol ethers. The microemulsion surfactants comprise a water- wetting surfactant, a cleaning surfactant and an emulsifying surfactant. The microemulsion may further comprise a non-ionic surfactant and a non-ionic co- surfactant. The wellbore-cleaning compositions may be pumped alone, ahead of a conventional spacer fluid or scavenger slurry and behind a conventional spacer fluid or scavenger slurry, in addition, the wellbore-cleaning composition may be incorporated into a carrier fluid such as (but not limited to) a conventional spacer fluid or scavenger slurry. The resulting fluid mixture may be pumped as a spacer fluid.</p> |
