دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. an extra support placed under the middle of racked pipe to keep the pipe from sagging. 2. a relatively narrow splinter of a rock formation that is stratigraphically disjointed. interrupts the consistency of another formation. and makes drilling that formation less predictable. A shale formation. for example. may be broken by a stringer of sandstone.