Compositions and methods for cleaning a wellbore prior to cementing

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