دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a drilling rig in which the source of power is one or more internalcombustion engines and in which the power is distributed to rig components through mechanical devices (such as chains, sprockets, clutches, and shafts). Also called a power rig. Compare electric rig. mechanical sticking n: a condition in which solid material such as sloughing shale, sand, or shale driven uphole by a blowout, or junk in the hole causes the drill stem to become stuck against the wall of the wellbore.

n: The shale collapsed caused by hydration,erosion,high pressure and tectonic stress.





a shale, usually in the wellbore, that increases size (swells) or casts of particles by reacting with brine or water.