N,N-Dimethylacrylamide/2-acrylamido-2-methylpropane sulfonic aci
N,N-Disubstituted amide cosurfactants in enhanced oil recovery p
N-vinyl lactam/unsaturated amide copolymers in thickened acid co
New leather oiling preparations and their use
Nitrile compounds as oil field biocides
Non-aqueous acid emulsion composition and method for acid-treati
Non-aqueous slurries used as thickeners
Non-hydrocarbon invert emulsions for use in well drilling operat
Non-polluting non-toxic drilling fluid compositions and method o
Noncorroding water base drilling fluids and additive system for
Nonpolluting drilling fluid composition
Novel compositions prepared from alkyl substituted nitrogen-cont
Novel compositions suitable for treating deep wells