دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

American Chemical Society.

a technique for isolating multiple fracs using a short downhole settable ring or restriction and dropping a hard rubber ball between frac jobs. Two or more ring/ball sets can be used to stage frac a long zone.

to fracture a zone after the initial attempt. Refracs may be to correct a problem during the initial frac or to expose new pay after stresses in the rock have been modified by production.