Rack pipe
Radial flow
Radiation
Radioactive tracer
Radioactive-tracer log
Radioactivity
Radioactivity log
Radioisotope
Radiometric grade
Rams
Rankine temperature scale
Rate of penetration
Rathole
Ratio
Rayleigh wave
RDB
Reaction value
Reading
Ream
Reamer
Receiver
Reciprocal sonde
Reciprocator
Record
Recorder
Recovery
Recovery factor
Rectify
Redox logging
Redox potential
Red pattern
Reef
Reference point
Reflection peak
Reinjection
Relative bearing
Relative permeability
Relief well
Reluctance
Repeat formation tester
Repeat section
Reserves
Reservoir
Reservoir-drive mechanism
Reservoir pressure
Reservoir temperature
Residual
Residual oil
Resistance
Resistivity
Resistivity index
Resistivity logs
Returns
Reversal
Rig
Rig down
Rig floor
Rig up
Riser
Riser pipe
Roentgen
Roller-cone bit
ROP
Rope socket
Rose diagram
Rotary bushing
Rotary drill bushing
Rotary drilling
Rotary rig
Rotary table
Roughneck
Roundtrip
Rugosity
Run pipe