دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

v: the partial or complete collapse of the walls of a hole resulting from incompetent, unconsolidated formations, high angle or repose and wetting along internal bedding planes. See also heaving and cave-in.

(pronounced sluffing") n: see caving.

n: the partial or complete collapse of the walls of a hole resulting from incompetent, unconsolidated formations, high angle or repose and wetting along internal bedding planes. See also heaving and cave-in.

movement of large amounts of shale material into the wellbore, usually caused by chemical reaction or earth shift forces. Typically as clumps of particles.

n: a condition wherein shale that has absorbed water from the drilling fluid expands, sloughs off, and falls downhole. A sloughing hole can jam the drill string and block circulation.

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.

a shallow bevel or angle that is not steep.

n: corrosionpreventive substance that is released into production fluids at a slow rate.

n: a manufactured cement in which the thickening time is extended by the use of a coarser grind, the elimination of the rapid hydrating components in its composition, and the addition of a chemil retarder. API classes N, D, E, and F are slow-set cements.

n: The cement that can delaying solidify.

n: 1. a tarlike substance that is formed when oil oxidizes. 2. a highly viscous mixture of oil, water, sediment, and residue.

n: The silt and warp deposited in the tank bottom.




a very viscous, usually solids stabilized emulsion. Often triggered by ferric iron and an asphaltenic oil after an acid job.