دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: clays that are encountered when drilling various formations;they mayor may not be incorporated purposely into the mud system.

n: natural clays,as opposed to commercial clays,are clays that are encountered when drilling various formations. The yield of these clays varies greatly and they may or may not be purposely incorporated into the mud system.

natural occurring clays as opposed to commercially formulated clays.