- A-annulus (well completion)
- Abandoned Petroleum Field
- Abandonment (well)
- Absolute Average Relative Error = AARE
- Absolute Open Flow (AOF)
- Absolute permeability @model
- Absolute Temperature Unit
- Absolute Zero Temperature = 0°
- Account (Finance)
- Accounting
- Accounting Equation (Finance)
- Accounting Period
- Account Ledger
- Accounts Payable = AP (Finance)
- Accounts Receivable = AR (Finance)
- Accrued Interest (Finance)
- Acentric factor = ω
- Acidizing
- Acoustic Cement Bond Logging
- Acoustic Impedance
- Acoustic Noise Propagation
- Acoustic Noise Propagation @model
- Additional Paid in Capital = APIC (Finance)
- Adiabatic Index = γ
- Adiabatic Process
- Aerospace Exploration Survey
- Ahmed’s (2017) Z-factor correlation @model
- Air (Atmosphere of Earth)
- Air (chemical substance)
- Air (disambiguation)
- Algebraic equation
- Alkanes
- Along-hole = AH (wellbore)
- Along-Hole Depth =AHD (wellbore)
- Altitude = ZALT
- Amortization
- Amount of chemical substance (physical property)
- Analytical Model
- Analytical Pressure Diffusion @model
- Analytical Production Forecast
- Analytical Recovery Forecast
- Analytic expression
- Anisotropic single-phase pressure diffusion model
- ANN permeability @model
- Annular Flow Heat Transfer Coefficient @model
- Annular hydraulic diameter
- Annulus (pipe)
- Annulus Pressure Test
- Anthropogenic Invasion
- Anticline Structure
- API gravity = γAPI
- Apparent cross-well transmissibility
- Apparent Hydraulic Diffusivity
- Apparent skin-factor
- Apparent Transmissibility
- Apparent well drainage transmissibility
- Appraisal Exploration
- Appraisal Petroleum Field
- Appraisal Wells
- Aquifer
- Aquifer Drive
- Aquifer Drive Models
- Archie @model
- Area (physical property)
- Arithmetic Average
- Array Sensor Log
- Arrhenius viscosity blending equation
- Artificial Flow Drive Mechanism
- Artificial Gas Lift (AGL)
- Artificial Intelligence = AI
- Artificial Invasion
- Artificial Neural Network (ANN) Categorization
- Artificial Neural Network (ANN) Regression
- Artificial Neural Networks = ANN
- Artificial Neural Network Z-factor correlations
- Asset (Business)
- Asset Market Value
- atm (unit)
- Atom
- Auto Loan
- Average Absolute Percentage Error = AAPE
- Average Formation Thickness
- Average Percentage Error = APE
- Average phase pressure
- Average Relative Error = ARE
- Avogadro constant
- Axial symmetric (geometry)
- Azimuthal Deviation (Trajectory)
- Closed-form expression
- Grunberg-Nissan viscosity blending equation
- Oswal-Desai viscosity blending equation
Overview
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