reamingreciprocal lateral sondereciprocal v the casingreciprocating scratcherrecompletion of a wellrecording gravimeterrecovery by in situ combustionrecovery of the casingrecumbent foldredox potential measurementredrillreduced radids of a wellreducing valvereed roller bitreeve v the wire lingreevingreflection methodreflection shootingrefraction methodrefraction shootingregenerated mudregional metamorphic rockregular tool jointregulating cockregulating valveregulation by stop cockreinforced concreterelative densityrelative permeabilityrelative viscosityreleasing socketreleasing spearrelief holerelief valveremovable packerremoval of cuttingsreplaceable cutterreplenishing valveresearch platformreserve mudreserve mud tankreserve pitreservoirreservoir boundaryreservoir capacityreservoir conditionsreservoir engineeringreservoir rockreservoir samplereservoir shutt off
