- Reflection coefficient (seismology)
- RHOB
- RC-4 (4-arm Roller Cetralizing Tool)
- RC-3 (3-arm Roller Cetralizing Tool)
- Rate Transient Analysis = RTA
- Rock Quality Indicator = RQI
- RPS
- rpm (spinner)
- RIH
- RES
- Radial Deconvolution = RDCV
- Reservoir (subsurface)
- Reynolds number = Re
- Rig Floor = Drill Floor (DF) = Derrick Floor (DF)
- Rheological single-phase pressure diffusion @model
- Rank of array element @ model
- Rock (stone)
- Risk premium
- Return on Investment = ROI
- Reservoir Study
- Reservoir Data Logs (RDL)
- Reservoir Data Logs (RDL) @model
- Reservoir Saturation Logging (RSL)
- Reservoir Flow Profile = RFP
- Real-time well logging
- Routine Core Analysis (RCAL)
- Reservoir Engineering = RE
- Reservoir Flow Model = RFM
- Reservoir Flow Profile (RFP)
- Resistivity Exploration Survey
- Rock formations
- Reflection Seismology
- Reservoir Pressure
- Relative Oil Mobility
- Relative Gas Mobility
- Relative Water Mobility
- Reservoir matrix
- RPM @model
- Rock Geomechanics
- Russian Hydrocarbon Reserves Uncertainty Categories
- Recovery Methods
- Reservoir deterioration in cross-well areas
- Redevelopment Planning (RDP) @ procedure
- Residual oil saturation to water sweep (sorw)
- Residual oil saturation to gas sweep (sorg)
- Rock Matrix Volume
- Redevelopment Plan (RDP)
- Reservoir flow
- Radian
- Radial Composite reservoir
- Real Gas EOS @model
- Radial fluid flow
- Radial VEH Aquifer Drive @model (van Everdingen-Hurst)
- Regular Grid
- Reservoir boundary
- Reservoir flow boundary
- Reservoir flow drive mechanisms
- Rate Optimization
- Richardson and Shaw IPR @ model
- Reserve-Replacement Ratio
- Reservoir Fluid Mobility
- Reservoir Storage (RS)
- Regression
- Research & Development = R&D
- Retained Earnings (Finance)
- Root Mean Square Error = RMSE
- Root Mean Square Deviation = RMSD
- Random Variable
- R&D record in P&L (Finance)
- Recovery Factor = RF
- Recoverable Hydrocarbon Reserves
- Rate-weighted Productivity Plot = q-weighted J-plot
- Reservoir pressure maintenance
- Remote Asset (Business)
- Artifical reservoir pressure maintenance
- Reservoir flow regimes
- RDCV @sample
- SDCV @sample
- Resource
- Reservoir Noise
- Reservoir Flow Noise @model
- Return (Investment)
- Reservoir Storativity
- Rock Matrix
- Rock Skeleton
- Reserves Summary
- Room Conditions
- Laboratory Conditions
- Revenue
- Turnover
- Top Line (Finance)
- Reynolds number in Pipe Flow
- Residual gas saturation to water displacement (sgrw)
- RPM Corey @model
- Relative Permeability Model = RPM
- Soave-Redlich-Kwong (SRK) EOS @model
- Reduced Temperature = Tr
- Reduced Pressure = Pr
- Reduced Fluid Properties
- Pseudo-reduced Pressure = Ppr
- Retrograde Condensation
- Retrograde Gas Condensate Reservoir
- Reservoir Pressure Depletion
- Reserves Depletion
- RTA Diagnostic Plots
- RTA NPI Diagnostic Plot
- Radial Cement Bond Tool Logging = RBT
- Correlation coefficient
- Linear Regression
- Linear Regression Coefficient
- Reserves-to-Production Ratio = R/P
- Reservoir Temperature
- Refutas viscosity blending equation
- RDCV @model
- Relative Density
- ρw water density McCain correlation @model
- Real number = R
- Reference FDP
- Rayleigh number = Ra
- Richardson number = Ri
- Regression Validation
- Reservoir unit
- Residual Recoverable Oil Reserves per well = Vour
- Residual Recoverable Gas Reserves per well = VGur
- Reservoir boundary flow condition @model
- Recovered Oil
- rb/stb
- Rob
- Return On Equity = ROE
- Return On Capital Employed = ROCE