ABSTRACT
Radioisotope: An unstable isotope of an element that decays spontaneously, emitting radiation. Radiolarian: A class of one cell marine animals with siliceous skeletons. Radionuclide: An unstable form of an element that emits nuclear radiation through radioactive decay. Radium: R226, one of the natural isotopes that as a trace element may incorporate into the matrix of naturally forming barium or strontium sulfate scale and make it a very low level radioactive material (NORM scale). Radius of Curvature: The radius of the guide arch, reel, or bend through which a pipe is moved. Radius of Investigation: The depth of investigation of a tool or logging process. Raf–nate: In solvent rening, that portion of the oil that remains undissolved and is not removed by the selective solvent. Also called “good” oil. Rag Pump: A rod pump with extremely loose tolerances (loose seals) that may be temporarily run in a well to pump ¤uid that contains sand. Used for cleanups after a fracture treatment. RA (Logging): Radioactive. Ram: One of the hydraulically actuated rams in a blowout preventer (blind, shear, pipe, or slip). Ramp-Up: The initial operational period of a liquefaction plant, during which the production is not still stabilized. It can be considered part of the commissioning of the plant. During the ramp-up, a large number of operational parameters are adjusted to optimize the production, in order to maximize production volumes and minimize energy consumption. Normally this phase usually lasts between 2 and 4 months. Range 1 Tubular: A pipe 16 to 25 ft in length. Range 2 Tubular: A pipe 25 to 34 ft in length. Range 3 Tubular: A pipe 34 to 48 ft in length. Range of Load (Beam Lift): The difference in the peak load at the polished rod on the upstroke and the minimum load on the downstroke. Rank Wildcat: An exploratory well drilled in a basin where no other wells (or too few wells to dene the basin) have been drilled. (Some areas use a specic distance between wells.) Rapid Phase Transitions: LNG undergoes a rapid transition to vapor especially when spilled on water. The volume of the LNG instantly expands 600 times resulting in an RPT or physical explosion that poses a hazard for structures and people close to the site of the incident. This explosion does not involve combustion. When LNG is spilled on water, heat is transferred from the water to the LNG. This results in a rapid transformation of liquid to gas, releasing a large amount of energy. RAPPS (Policies): Reasonable and prudent practices for stabilization. RAPPS (Subsea): Riser annulus pressure protection system. Rasp: A wire line-run, round, rough le-like device useful for scraping hard deposits on tubing walls.
