دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the theory that the earths landforms assumed their present configuration in a brief episode at the beginning of geologic history-possibly in a single great catastrophic event-and have remained relatively unchanged since that time. Compare uniformtarianism. catcher n: a device fitted into a junk basket that retains the junk picked up by the basket catch samples v: to obtain cuttings for geological information as formations are penetrated by the bit The samples are obtained from drilling fluid as it emerges from the wellbore or, in cable-tool drilling, from the bailer. Cuttings are carefully washed until they are free of foreign matter, dried, and labelled to indicate the depth at which they were obtained.

n: A device fitted into a junk basket and acting as a trap door to retain the junk.

n: a device made up on a fishing string that drills a formation core surrounding and containing the fish to be retrieved. It has two sets of catchers: one to break off the drilled core, and another to form a basket below the core and the fish.

n: a fishing tool that uses fingerlike catchers to gather and trap junk at the bottom of the hole for retrieval. Aso called a poor-boy junk basket.

n: the thin nipple with claw tooth on the lower end ,connected with the lower end of fishing string and lower to the bottom to fish the fallout

n: all the other architectures are similar to reverse circulation junk basket except valve architecture.

n: a hydraulically powered fishing tool that uses pressure differential to trap and retrieve junk from the bottom of the hole.

n: see reversecirculation junk basket.

n: a device made up on the bottom of the fishing string to catch and retrieve pieces of junk from the bottom of the hole.

n: a cyclindrical tool designed to retrieve junk or foreign objects loose in a wellbore.

may also be called a Jet Basket: a device with nozzles and a basket or catch basin to catch smaller pieces of junk stirred up by circulation.

n: a special tool made up on the bottom of the drill stem to pick up junk from the bottom of the hole. Most junk retrievers are designed with ports that allow drilling fluid to exit the tool a short distance off the bottom. This flow of fluid creates an area of low pressure inside the tool so that the junk is lifted and caught in the retriever by the higher pressure outside the tool. See junk, junk basket.

junk basket.

n: see finger-type junk basket.