دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: balls made of nylon, hard rubber, or both and used to shut off perforations through which excessive fluid is being lost.

n: Made by nylon or ebonite. Used to block off the opening in the capital string and prevent fluid lossing when fracturing.

small, rubber-covered, hard centered balls that can seal individual perforations during a chemical treatment.