- Estimated Ultimate Recovery Factor = EURF
- Equation of State = EOS
- Enhanced Oil Recovery (EOR)
- Ergun constant
- Elevation
- Effective formation thickness
- Exploration Data Package (EDP)
- Exploration Modelling
- E-Coiled tubing logging
- e-Coiled tubing
- Entropy
- Enthalpy (H)
- Effective porosity = PHIE
- Exponential permeability @model
- Early Time Response (ETR)
- Electric Submersible Pump (ESP)
- Energy
- Empirical relationship (phenomenological)
- Explicit correlation
- Euler equation
- Edge-water Drive Aquifer
- Electromagnetic Defectoscopy
- Exponential Integral (Ei or E1)
- Euler–Mascheroni constant
- Economics
- Equity (Business)
- Economic Entity
- Employee (Company)
- Earnings before interest and taxes = EBIT (Finance)
- Earnings before interest, taxes, depreciation, and amortization = EBITDA (Finance)
- Earnings before income taxes = EBT (Finance)
- Expenses (Finance)
- Estimator @model
- Expected value @model
- Extra Heavy Oil = Bitumen (fluid composition)
- Estimated Ultimate Oil Recovery = EUOR
- Estimated Ultimate Gas Recovery = EUGR
- Estimated Ultimate Recovery = EUR
- Estimated Ultimate Oil Recovery Factor = EUORF
- Estimated Ultimate Gas Recovery Factor = EUGRF
- Empirical Production Data Analysis
- Earth's Gravity
- Board of Directors = BOD (Company)
- EBITDA Margin
- Earth's Heat Flux
- Easting
- Engineering
- Error Function = Erf
- Escrow
- End Of Service Benefits = EoSB (Finance)
- Complementary Error Function = Erfc
- Earth's Structure
- Earth Science
- Estimating Datum Pressure from downhole pressure gauge
- Euler equation for 1D inviscid fluid flow
- Euler equation for steady-state 1D inviscid fluid flow
- Enterprise Value = EV (Business)
- Exponential Production Decline
- Dirac Delta Function = δ
- Earth's Gravity Centre
- Earth's Gravity Direction = eg
- Earth's Surface
- Electromagnetic Pulse Defectoscopy = EMP
- e-Line
- Electric Wireline = EWL
- Electric Wireline Unit = EWLU
- EOS Fluid @model
- Extensive physical property
- Equity Market Capitalization (Business)
- Explicit expression
- Estimator
- Estimated Lifetime = ELT = t∞
- Expectation operator = E[]
- Central momentum = μn
- Standardized central momentum = <μn>
- Effective Stress
- Non-recoverable Oil Reserves
- Explicit Linear Production Model = ELPM
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