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Showing definitions 1 to 10 of 84 for the letter 'r'

Racking board A platform high in the derrick on well-service rigs, where the derrick man stands when racking tubing being pulled from the well. Racking pipe The act of placing lengths of pipe in an orderly arrangement in the derrick. Radioactivity well logging The recording of the natural or induced radioactive characteristics of subsurface formations. A radioactivity log, also known as a radiation log, normally consists of two recorded curves: a gamma-ray curve and a neutron curve. Both indicate the types of rocks in the formation and the types of fluids contained in the rocks. The two logs may be run simultaneously in conjunction with a collar locator in a cased or uncased hole. Ram The closing and sealing component on a blowout preventer. One of three types -blind, pipe, or shear -may be installed in several preventers mounted in a stack on top of the well bore. Blind rams, when closed, form a seal on a hole that has no drill pipe in it; pipe rams, when closed, seal around the pipe; shear rams cut through drill pipe and then form a seal. See blind ram, pipe ram, and shear ram. Ram blowout preventer A blowout preventer that uses rams to seal off pressure on a hole that is with or without pipe. It is also called a ram preventer. See blowout preventer and ram. Range/bearing One of the methods that some positioning systems operate in. A single station that provides a range and also a bearing relative to another known station or trig (e.g. Artemis, Polarfix). Range/range One of the several modes of offshore navigation, requiring at least two beacons (e.g. Syledis is often used this way). Rat hole See mouse hole. Rate of penetration (ROP) The depth of hole drilled in a specified time; usually given in feet per hour. Raw material One of the chemical ingredients of a process. Basic raw materials are those which are present wholly or in part in the product; that is, they have reacted chemically. Often referred to as feedstock.

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