دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

v: to place a special mixture of clay and oil, or other materials, at a specific point in the wellbore. The size of the pill is usually several barrels. For example, a rig crew may spot a 20-barrel (3,180-litre) pill of bentonite clay and diesel oil at or near a formation into which drilling mud is escaping. By lowering the driI1 stem to the desired depth, the pill is slowly pumped down the stem and into the annulus. If all goes well, the pill will migrate into the formation taking the driI1ing mud and plug it closed.