دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a fishing tool installed inside washover pipe to prevent a fish stuck off bottom from falling to bottom during a washover. Slips on the anchor washpipe spear engage the inside of the washover pipe as the pipe travels downhole around the fish.

a pipe connection with consistent I.D> and O.D. with the pipe. The connection walls are thin and weaker than EU or IU connections. Used in flush joint liners and wash pipes.

v: to release pipe that is stuck in the hole by running washover pipe. The washover pipe must have an outside diameter small enough to fit into the borehole but an inside diameter large enough to fit over the outside diameter of the stuck pipe. A rotary shoe, which cuts away the formation, mud, or whatever is sticking the pipe, is made up on the bottom joint of the washover pipe, and the assembly is lowered into the hole. Rotation of the assembly frees the stuck pipe. Several washovers may have to be made if the stuck portion is very long.

v: A type of milling operation in which the outer surfaces of a plug or similar fish are milled with a circular hollow mill. By including wash pipe in the tool string, the mill face can reach over the body of the fish until it can be pushed to bottom, or unt

a recovery process in which a larger pipe is used with circulation to surround and capture a pipe stuck in sand or cuttings. Circulation is critical to washing the sand from around the fish. Can be used with normal or reverse circulation.

a nonupset pipe with an O.D. close enough to the I.D. of an inner pipe to cause hydraulic diversion. Used inside a screen during gravel packing to direct flow and gravel to the bottom of the screen and effect a tighter pack. Developing hydraulic diversion