Skip to content

Oil & Gas Glossary

Hydrostatic pressure​

Confused by multitude of oil & gas data and analytics terms? Get easy-to-understand definitions in our glossary.

What is Hydrostatic pressure?

What is Hydrostatic pressure?

the pressure exerted by a fluid at rest due to the force of gravity.

Back to glossary

Additional Terms by Category

Reservoir Engineering

API Gravity

Capillary Pressure

Compressibility

Darcy's Law

Field Development Plan

Formation Pressure

Gas Formation Volume Factor

Gas Solubility

Gas Specific Gravity

Oil Formation Volume Factor

Oil Reservoirs

Permeability

Porosity

Relative Permeability

Reserves

Reserves Estimation

Reservoir Flow Regimes

Resistivity

Saturation

Surface Tension

Viscosity

Oil reserves

BHCT (Bottomhole Circulating Temperature)

BHST (Bottomhole Static Temperature)

Big Data in Reservoir Engineering

Borehole Pressure

Compartmentalization

Data Analytics in Reservoir Management

Data-Driven Reservoir Characterization

Depositional system

Dip

Dynamic Reservoir Modeling

Economic Limit

Facies modeling

Formation

Formation evaluation

Frac tree

Gas in solution

Gas-oil contact

Gas-prone

Geological Modeling

Gas-water contact

Geostatistics

Geosteer

GIIP (Gas Initially In Place)

HBP (Held by Production)

Hydrostatic pressure

Integrated Reservoir Modeling

Material Balance Equation

Monte Carlo Simulation

Oil-Water Contact (OWC)

Overburden

P10, P50, P90 Reserves

Pore Volume

Probabilistic Reserves

Production Forecasting

Production Optimization

Rate-Transient Analysis

Recovery Factor

Reserves Replacement Ratio (RRR)

Reservoir Appraisal

Reservoir Characterization Analytics

Reservoir Data Integration

Reservoir Engineering Economics

Reservoir Monitoring

Reservoir Optimization

Reservoir Parameter Estimation

Reservoir Performance Analysis

Reservoir Performance Prediction

Reservoir Production Forecast

Reservoir Rate Forecasting

Reservoir Simulation History Matching

Reservoir Simulation Modeling

Reservoir Simulation Uncertainty

Reservoir Surveillance

Shut-In Pressure

Sidetrack

Statistical Reservoir Modeling

Sweet spot

Tight Oil

Topographic Map

Uncertainty Quantification

Artificial Lift Techniques

Reservoir Connectivity & Flow Assurance

Reservoir Fluid Properties (PVT Analysis)

Reservoir Infill Drilling

Reservoir Heterogeneity & Anisotropy

Reservoir Volumetrics

Wellbore Productivity Optimization

Well Testing & Interpretation

Well Placement

Artificial Lift Techniques

Big Data in Reservoir Engineering

Carbon Capture, Utilization, and Storage (CCUS)

Data Analytics in Reservoir Management

Data Assimilation in Reservoir Modeling

Data-Driven Reservoir Characterization

Dynamic Reservoir Modeling

Economic Limit

Geostatistics

Oil & Gas Industry

Abandonment

API (American Petroleum Institute)

API Gravity

Appraisal well

Asset Development

Asset Operations

Barrel

BBL

BCF

BCM

Bitumen

Block

Blow-out

BOPD (Barrels of Oil Per Day)

CAPEX

Casing

Christmas Tree

Clastic

Condensate

Contingent resources

Conventional Oil

Crude Oil

Derrick

Development Well

Downstream

Drilling

Dry Gas

Dry hole

E&P

Elephant

Enhanced oil recovery (EOR)

Exploration

Facility Decommissioning

Flaring

Flowlines

Fracking (Hydraulic Fracturing)

Fracturing Fluid

Gas Injection

G&P (Gathering and processing)

Gas Oil Ratio (GOR)

Hitch

Horizontal Drilling

HPU (Hydraulic Power Unit)

Hydrocarbon

Lease

LNG (Liquefied Natural Gas)

LPG (Liquefied Petroleum Gas)

Midstream

Mud

Natural Gas

Natural Gas Liquids (NGLs)

Offshore/Onshore

Oil Field

Operator

Opex

Permeability

Petroleum

Pig

Play

Porosity

Pressure Containment

Proven Reserves

Recovery Factor

Refinery

Reserves

Reservoir

Royalty

Seismic Data

Site Restoration

Sour Crude

Sour gas

Strings

Sweet Crude

Tight Gas

Ultra-Heavy Oil

Upstream

Water flooding

Well

Well logging

Well Plugging

Wellbore

Wellbore Isolation

Wellhead

Wet Gas

Wireline

ZLD (Zero Liquid Discharge)

Dead oil

Elasticity

Extended-reach drilling (ERD)

intelligent well

Lessor Royalty

Licensing Round

Net Revenue Interest

Net Profits Interest

Nonparticipating Royalty

P&A (Plug and Abandon)

Profit Oil

Pad

Refracturing

Unconventional Resource

Oil & Gas Analytics

Decline Curve Analysis

Drilling analytics

Drilling optimization

Energy industry analytics

Energy market forecasting

EUR (Estimated Ultimate Recovery)

Flow Regimes

Formation evaluation

Oil and gas data analysis

Production forecasting

Recovery Factors

Reserves estimation and analytics

Reservoir Characterization

Reservoir engineering analytics

Reservoir modeling

Type Curves

Well cost estimation

Well design

Well Integrity

Well intervention

Well planning

Well testing

Wellbore trajectory

Box Plots

Wireline Log

Big Data Management

Business Intelligence (BI)

Cloud Computing for O&G

Data Democratization

Data-Driven Workflows

Data Governance

Data Ingestion & Integration

Data Visualization (Dashboards)

Decision Support Systems

Economic Modeling

Exploratory Data Analysis (EDA)

Petrophysics

Reserves Estimation

Shale Analytics

Statistical Modeling

Flow Rates

Pressure Data

Production Curves

Predictive Algorithms

Predictive Models

Data Normalization

Time-to-First-Production (TTFP)

Data Fusion

Capital Efficiency

Asset Reconciliation

Flow Rates

Predictive Algorithms

Predictive Models

Pressure Data

Production Curves

Data Normalization

Time-to-First-Production (TTFP)

Normalized Production Data

Capital Efficiency

Asset Reconciliation

Data Fusion

Normalized Production Data

ESG Data

State Agency Energy Data

EIA State Data

Texas RRC Data

Oklahoma Corporation Commission

California Energy Commission

NYSERDA Datasets

PUC Reports (Public Utilities Commission)

Water Usage and Disposal

Production Data Analytics

Drilling Data Analytics

Reservoir Data Analytics

Predictive Analytics Energy

Machine Learning Oil Gas

Artificial Intelligence Energy

Big Data Oil Gas

Data Visualization Energy

Real-Time Analytics

Performance Analytics

Internet of Things (IoT) Oil Gas

Sensor Technology Energy

Wireless Sensor Networks

Condition Monitoring

Vibration Monitoring

Temperature Monitoring

Pressure Monitoring

Flow Monitoring

Leak Detection Systems

Pipeline Monitoring

Digital Oilfield Technology

Smart Wells

Intelligent Completions

Real-Time Monitoring

Remote Operations

Automated Production

Digital Twin Technology

Edge Computing Oil Gas

Satellite Monitoring

Machine Learning

Artificial Intelligence (AI)

Artificial Neural Networks (ANN)

Classification

Clustering

Decision Trees

Deep Learning

Ensemble Learning

Feature Engineering

Hyperparameters

Machine Learning

Predictive Modeling

Regression

Reinforcement Learning

Time Series Analysis

Distribution

Cloud-Based ML Platforms

Data Preprocessing & Cleaning

Explainable AI (XAI)

Feature Scaling & Normalization

ML-powered Decision Support Systems

Model Evaluation & Validation

Explainable AI (XAI)

Gradient Boosting

Model Drift Detection

Synthetic Data Generation

Label Imbalance

AutoML

Reinforcement Learning

Time-Series Cross Validation

Bayesian Optimization

Recursive Feature Elimination (RFE)

Multicollinearity in ML

Model Calibration

Transfer Learning in Oil & Gas

Dimensionality Reduction

Outlier Detection Models

Hyperparameter Tuning

Cross-Validation Strategies

Ensemble Model Stacking

Support Vector Regression (SVR)

Recurrent Neural Networks (RNN)

Model Drift Detection

Semi-Supervised Learning

Synthetic Data Generation

Feature Drift Monitoring

Data Labeling Strategies

Self-Supervised Learning

Graph Neural Networks (GNNs)

Model Explainability Frameworks

Reservoir Engineering Formulas

API Gravity Formula

Arps Decline Curve Equation

Capillary Pressure

Darcy's Law Equation

Diffusivity Equation

Dimensionless Pressure (Kamal and Brigham)

Gas Deviation Factor

Gas Formation Volume Factor

Gas-Oil Ratio (GOR)

Kozeny-Carman Relationship

Material Balance Equation

Oil Formation Volume Factor (Standing's Correlation)

Original Oil in Place (OOIP)

Total Compressibility

Transmissivity Formula

Vogel's IPR for Solution Gas Drive Reservoirs

Water Cut Formula

Productivity Index (PI) Equation

Recovery Factor Formula

Original Gas in Place (OGIP)

Gas Expansion Factor (Bg)

Solution Gas-Oil Ratio (Rs)

Oil Compressibility (co)

Water Compressibility (cw)

Rock Compressibility (cr)

Pseudo-Pressure Function

Skin Factor Calculation

Wellbore Storage Constant

Hydraulic Fracturing Pressure

Fracture Half-Length Equation

Proppant Transport Model

Conductivity Impairment Index

Non-Darcy Flow Coefficient (D)

Multiphase Flow Correlation

Fetkovich Decline Type Curve

Duong Decline Model Parameters

Power Law Exponential Decline

Stretched Exponential Decline

Terminal Decline Rate Analysis

Minimum Decline Rate Threshold

Hyperbolic Decline Parameter (b)

Exponential Decline Equation

Harmonic Decline Curve

Seismic Velocity Analysis

Acoustic Impedance Formula

AVO Intercept-Gradient

Fluid Substitution Equation

Gassmann Equation

Biot-Gassmann Theory

Shear Modulus Calculation

Bulk Modulus Reservoir Rock

Poisson's Ratio Rock

Lame Constants Formation

Thomsen Anisotropy Parameters

Vp/Vs Ratio Analysis

Density Log Porosity

Neutron-Density Crossplot

Sonic Porosity Calculation

Shale Volume (Vshale) Gamma Ray

Effective Porosity Correction

Net Pay Thickness

Water Saturation Archie Equation

Simandoux Shaly Sand Saturation

Indonesia Shaly Sand Model

Waxman-Smits Cation Exchange

Dual Water Saturation Model

Movable Oil Calculation

Residual Oil Saturation

Critical Water Saturation

End Point Water Saturation

Corey Relative Permeability

Brooks-Corey Capillary Pressure

Leverett J-Function

Drainage-Imbibition Hysteresis

Buckley-Leverett Front Tracking

Fractional Flow Water Cut

Welge Tangent Method

Johnson-Bossler-Naumann Method

Hurst Exponent Fractal Analysis

Detrended Fluctuation Analysis

Lyapunov Exponent Chaos

Hurst-Kolmogorov Scaling

Power Spectral Density Analysis

Pseudo-Steady State Equation

Steady State Radial Flow

Transient Radial Flow Solution

Infinite Acting Radial Flow

Bounded Reservoir Solution

Partial Penetration Skin

Horizontal Well Skin Factor

Multilateral Well Productivity

Interference Testing Equation

Pulse Testing Response

Falloff Test Analysis

Buildup Test Derivative

Horner Time Approximation

MBH Middle Time Region

Tiab Direct Synthesis

Pressure Derivative Log-Log Plot

Bourdet Type Curve Matching

Petroleum Economics & Finance

Finding & Development (F&D) Cost

Exploration Risk Factor

Break-Even Production Rate

Cash Flow Per BOE (Barrel of Oil Equivalent)

Backwardation vs. Contango

OPEC Basket Price

Hydrocarbon Maturity Model

Depletion Expense

Upstream Fiscal Regimes

Cost Recovery Mechanism

Windfall Profit Tax

Lease Operating Expenses (LOE)

Asset Retirement Obligation (ARO)

Host Government Take

Payout Ratio

Return on Capital Employed (ROCE)

Decline Rate

Project Finance

Debt-to-Equity Ratio

Production Efficiency Ratio (PER)

Operating Margin

Lifting Costs

Field Abandonment Costs

Excess Profit Tax

Profit-to-Investment Ratio (PIR)

Hydrocarbon Netback Value

Marginal Cost of Production

Economic Limit Factor (ELF)

Production Tax Credit (PTC)

Exploration Success Ratio (ESR)

Petroleum Fiscal Stability Analysis

Host Government Participation (HGP)

Geopolitical Risk Premium

Depletion Allowance in Taxation

Blending Economics

Non-Productive Time (NPT)

Energy Private Equity

Energy Infrastructure Funds

Royalty Trusts (PTP)

Master Limited Partnerships (MLP)

Energy REITs

Commodity ETFs

Energy Hedge Funds

Direct Participation Programs (DPP)

Oil and Gas Syndications

Energy Infrastructure Investment

Pipeline Investment

Midstream Investment

Payout Period

Return on Investment (ROI)

Return on Assets (ROA)

Return on Equity (ROE)

Energy Investment Metrics

Reserve-Based Lending (RBL)

Borrowing Base

Proved Developed Producing (PDP) Value

Oil Price Volatility

Natural Gas Pricing

WTI vs Brent Crude

Henry Hub Natural Gas

Crack Spread Analysis

Spark Spread Analysis

Contango vs Backwardation

Futures Curve Analysis

Options Trading Energy

Energy Derivatives

ESG Investing Energy

Energy Transition Investing

Carbon Credit Investment

Renewable Energy Investment

Clean Energy Investment

Green Bonds Energy

Sustainable Energy Finance

Climate Risk Assessment

Stranded Asset Risk

Energy Portfolio Decarbonization

Mineral Asset Valuation Terms

Net Present Value (NPV)

Discount Rate

Internal Rate of Return (IRR)

Cash Flow Analysis

Tax Regime

Measured Mineral Resource

Indicated Mineral Resource

Inferred Mineral Resource

Probable Reserve

Commodity Price Forecasting

Spot Price vs. Contract Price

Hedging Strategies

Cut-Off Grade

Strip Ratio

Geopolitical Risk Assessment

Mine Life Estimation

Ore Grade

Mineralization Cutoff

Tonnes to Ounces Conversion

JORC Code (Joint Ore Reserves Committee Code)

NI 43-101 Report

Exploration Expenditure (EXP CAPEX)

Sustaining Capital

Net Smelter Return (NSR)

Metallurgical Recovery Rate

Concentrate vs. Dore Bar

Market Approach in Mineral Valuation

Cost Approach in Mining Valuation

Income Approach in Mineral Valuation

Multiples of Exploration Expenditure (MEE)

Real Options Valuation (ROV) in Mining

Net Asset Value (NAV) in Mining

All-in Sustaining Cost (AISC)

Smelter & Refining Charges (TC/RC)

Geotechnical Stability Risks

Preliminary Economic Assessment (PEA)

Pre-Feasibility Study (PFS)

Feasibility Study (FS)

Bankable Feasibility Study (BFS)

Payback Period

Sensitivity Analysis

Weighted Average Cost of Capital (WACC)

Dilution

Mining Method (Open Pit vs. Underground)

Environmental Impact Assessment (EIA)

Oil & Gas Royalties

Reclamation & Closure Costs

Offtake Agreements

Risk-Adjusted Discount Rate

Social License to Operate (SLO)

Resource Reconciliation

Mineral Owners

Mineral Rights vs Surface Rights

Fee Simple Ownership

Severed Mineral Rights

Mineral Deed

Mineral Rights Valuation

Net Mineral Acres (NMA)

Gross Mineral Acres

Fractional Mineral Interest

Executive Rights

Non-Executive Mineral Interest (NEMI)

Mineral Rights Due Diligence

Mineral Rights Title Search

Chain of Title

Title Opinion

Mineral Rights Inheritance

Mineral Rights Probate

Heirship Determination

Royalty Interest (RI)

Non-Participating Royalty Interest (NPRI)

Overriding Royalty Interest (ORRI)

Term Royalty Interest

Perpetual Royalty Interest

Royalty Deed

Royalty Payment Calculation

Royalty Check Stub Analysis

Royalty Decimal Interest

Gross Royalty vs Net Royalty

Royalty Audit

Royalty Suspension

Shut-in Royalty

Minimum Royalty

Sliding Scale Royalty

Oil and Gas Lease

Lease Bonus Payment

Primary Term vs Secondary Term

Delay Rental Payment

Lease Extension

Top Lease

Lease Expiration

Continuous Operations Clause

Force Majeure Clause

Pugh Clause

Depth Severance Clause

Horizontal Pugh Clause

Lease Assignment

Farmout Agreement

Farmin Agreement

Mineral Rights Appraisal

Midstream Terms

Midstream Sector

Pipeline

Gathering System

Transmission Pipeline

Compressor Station

Pump Station

Right-of-Way (ROW)

Pipeline Tariff

Common Carrier Pipeline

Contract Carriage

FERC (Federal Energy Regulatory Commission)

PHMSA (Pipeline and Hazardous Materials Safety Administration)

Pipeline Integrity

Pigging

SCADA (Supervisory Control and Data Acquisition)

Liquefied Natural Gas (LNG)

Liquefaction & Regasification

LNG Terminal

Floating LNG (FLNG)

Natural Gas Liquids (NGLs)

Fractionation

Gas Processing Plant

Sour Gas & Sweetening

Storage Facility

Salt Cavern Storage

Underground Gas Storage

Terminal

Custody Transfer

Measurement & Metering

Drag Reducing Agent (DRA)

Throughput

Vapor Recovery Unit (VRU)

Decommissioning

Smelter & Refining Charges (TC/RC)

Geotechnical Stability Risks

Preliminary Economic Assessment (PEA)

Pre-Feasibility Study (PFS)

Feasibility Study (FS)

Bankable Feasibility Study (BFS)

Payback Period

Sensitivity Analysis

Weighted Average Cost of Capital (WACC)

Dilution

Mining Method (Open Pit vs. Underground)

Environmental Impact Assessment (EIA)

Oil & Gas Royalties

Reclamation & Closure Costs

Offtake Agreements

Risk-Adjusted Discount Rate

Social License to Operate (SLO)

Resource Reconciliation

Pipeline Infrastructure

Gathering Systems

Transmission Pipelines

Distribution Pipelines

Pipeline Capacity

Pipeline Utilization

Pipeline Maintenance

Pipeline Construction

Pipeline Economics

Gas Processing

Oil Refining

NGL Fractionation

Tank Farms

Underground Storage

LNG Facilities

Export Terminals

Import Terminals

Crude Oil Transportation

Natural Gas Transportation

Pipeline Transportation

Truck Transportation

Rail Transportation

Marine Transportation

Logistics Optimization

Transportation Economics

Modal Selection

Supply Chain Management

Midstream Sector Overview

Gathering System Design

Transmission Line Monitoring

Compressor Station Operations

Pump Station Reliability

Right-of-Way Acquisition

Pipeline Tariff Structures

Common Carrier Regulations

Contract Carriage Agreements

FERC Compliance

PHMSA Safety Standards

Pipeline Integrity Management

Pipeline Pigging Techniques

SCADA Systems Integration

LNG Liquefaction Process

Regasification Terminal Operations

Floating LNG (FLNG) Technology

NGL Extraction Methods

Fractionation Plants

Sour Gas Processing

Storage Facility Operations

Salt Cavern Storage Utilization

Energy Markets & Trading Terms

Spot Market

Forward Market

Futures Contract

Energy Arbitrage

Liquidity in Energy Markets

Bid-Ask Spread

Price Discovery

Day-Ahead Market

Real-Time Market

Balancing Market

Load Forecasting

Congestion Pricing

Interconnection Capacity

Hedging in Energy Trading

Swaps in Energy Trading

Options Contract in Energy Markets

Margin Calls in Energy Trading

Capacity Market

Renewable Energy Certificates (RECs)

Carbon Trading & Emissions Markets

Independent System Operator (ISO)

Regional Transmission Organization (RTO)

Energy Trading Hubs

Market Clearing Price (MCP)

Merchant Power Plant

Take-or-Pay Contract

Virtual Power Purchase Agreement (VPPA)

Contract for Differences (CfD)

Financial Transmission Rights (FTRs)

Locational Marginal Pricing (LMP)

Load-Serving Entity (LSE)

Heat Rate in Power Markets

Time-of-Use (TOU) Pricing

Negative Pricing in Electricity Markets

Balancing Costs in Energy Markets

Block Trading in Energy Markets

Renewable Portfolio Standard (RPS)

Ancillary Services Market

Bankable Feasibility Study (BFS)

Payback Period

Sensitivity Analysis

Weighted Average Cost of Capital (WACC)

Dilution

Mining Method (Open Pit vs. Underground)

Environmental Impact Assessment (EIA)

Oil & Gas Royalties

Reclamation & Closure Costs

Offtake Agreements

Risk-Adjusted Discount Rate

Social License to Operate (SLO)

Resource Reconciliation

Upstream / Downstream

Over-the-Counter (OTC)

Mark-to-Market (MTM)

Swing Contract

Tolling Agreement

Force Majeure

Imbalance Penalty

Citygate

Capacity Release

Crack Spread

Spark Spread

Bunker Fuel

Scheduling

Basis Trading

Calendar Spread

Butterfly Spread

Energy Basis Differential

WTI Pricing

Brent Crude Benchmark

Henry Hub Index

NYMEX Trading

ICE Futures Exchange

Commodity Curve

Prompt Month Contract

Back Month Futures

Storage Arbitrage

Weather Derivatives

Demand Response Market

Energy Imbalance Market

Frequency Regulation

Spinning Reserves

Non-Spinning Reserves

Ramp Rate Constraints

Must-Run Generation

Virtual Bidding

Convergence Bidding

Intraday Trading

Basis Risk

Curve Shape Analysis

Volatility Smile

Greeks in Energy Options

Delta Hedging

Gamma Scalping

Structured Products Energy

Collateral Management

Credit Support Annex

ISDA Agreements

Master Trading Agreement

Physical Delivery

Mineral Asset Valuation Formulas

Net Present Value (NPV) Equation

Internal Rate of Return (IRR)

Payback Period

Discounted Cash Flow (DCF)

Price Elasticity of Supply

Cutoff Grade Calculation

Stripping Ratio (SR)

Ore Grade (G)

Mine Life Estimation

Metal Recovery Rate

Resource Tonnage Calculation

Net Smelter Return (NSR)

Gross Revenue

Break-even Price

Revenue per Ton of Ore

Operating Cost per Ton

Cost-to-Revenue Ratio

Sensitivity Analysis Formula

Mine Closure Cost Estimation

Royalty Interest Calculation

Net Revenue Interest (NRI)

Gross Revenue Interest

Mineral Acre Value

Lease Bonus Per Acre

Override Royalty

Non-Participating Royalty (NPR)

Working Interest Valuation

Carried Interest Formula

Reversionary Interest

Royalty Valuation Model

Production Royalty Rate

Sliding Scale Royalty

Gross Proceeds Royalty

Net Proceeds Royalty

Market Value Royalty

Royalty Suspension

Payout Royalty Adjustment

Mineral Rights Appraisal

Severed Mineral Estate

Surface Rights Valuation

Pooling Unit Royalties

Unitization Royalties

Horizontal Well Royalties

Spacing Unit Allocation

Take-Pay Royalty Clause

Gas Royalty Valuation

Condensate Royalty Calculation

NGL Royalty Allocation

Shrinkage Factor Royalty

BTU Content Adjustment

Gravity Bank Adjustment

Processing Deduction Royalty

Transportation Deduction

Gathering Deduction Calculation

Post-Production Costs

Lease Operating Expense (LOE) Allocation

Netback Royalty Value

Realized Price Royalty

Hedged Price Impact Royalty

Escalation Clause Royalty

Inflation Adjusted Royalty

Fair Market Value Clause

Most Favored Nations Royalty

Audit Clause Royalties

Suspense Period Royalty

Payout Threshold Calculation

Carry Forward Losses Royalty

Depletion Allowance Claim

Intangible Drilling Costs (IDC)

Tangible Drilling Costs Allocation

Dry Hole Contribution

Completion Cost Sharing

AFE Approval Royalties

Joint Operating Agreement (JOA)

Net Profits Interest (NPI)

Carve-Out Interest

Promoted Interest

Back-In After Payout

Tail-End Working Interest

Farmout Agreement Value

Farm-In Participation

Area of Mutual Interest (AMI)

Depth Severance Clause

Term Assignment Royalty

Permanent Non-Participating

Convertible Override

Overriding Royalty Conversion

Production Payment Valuation

Volumetric Production Payment

Risk Service Contract Royalty

Technical Service Fee

Signature Bonus Allocation

Production Sharing Royalty

Cost Oil Recovery

Profit Oil Split

R-Factor Sliding Scale

Internal Rate of Return Hurdle

Government Take Calculation

Ring-Fence Taxation Royalty

Petroleum Revenue Tax

Drilling Engineering Formulas

Hydrostatic Pressure (HP)

Equivalent Circulating Density (ECD)

Annular Velocity (AV)

Jet Impact Force (JIF)

Pressure Loss in Annulus (ΔP)

Rate of Penetration (ROP) Model (Modified Bourgoyne & Young)

Mechanical Specific Energy (MSE)

Drill Bit Hydraulic Horsepower (HHP)

Kick Tolerance

Initial Circulating Pressure (ICP)

Kill Mud Weight (KMW)

Bottomhole Pressure (BHP)

Casing Burst Pressure

Casing Collapse Pressure

Cement Slurry Density

Wellbore Stability Factor (WSF)

Torque and Drag (T&D)

Swab & Surge Pressure

Directional Well Build Rate

Hole Cleaning Efficiency (HCE)

Petrophysics & Formation Evaluation Formula

Porosity Equation

Bulk Density

Grain Density

Total Porosity from Density Log

Water Saturation (Archie’s Equation)

Resistivity Index

Formation Factor

Bulk Volume Water (BVW)

Kozeny-Carman Permeability Equation

Timur-Coates Permeability Model

Hydraulic Conductivity

Formation Resistivity Factor

Gamma Ray Index (GRI)

Sonic Porosity

Neutron Porosity

Density-Neutron Crossplot Interpretation

Poisson’s Ratio

Young’s Modulus

Brittleness Index (BI)

Mudcake Resistivity

Drilling Engineering Terms

Managed Pressure Control (MPC)

Kick-Off Point (KOP)

Mud Logging

Drillstring Vibration

Lost Circulation Material (LCM)

Hole Cleaning Efficiency

Underreaming

Drilling Parameter Optimization

Torque and Drag Analysis

Casing Centralization

Lost Circulation Zones

Bit Selection Criteria

Directional Survey Tools

Rate of Penetration (ROP) Optimization

Kick Detection Systems

Drilling Window

Rotary Table

Drillstring Fatigue

Wellbore Tortuosity

Torque-and-Drag Modeling

Managed Pressure Drilling Systems

Mud Pulse Telemetry

Drilling Fluid Rheology

Bit Whirl Analysis

Rig Move Logistics

Formation Integrity Testing (FIT)

Casing Wear Prediction

Downhole Motor Performance

Black list (drilling fluids)

Gray list (drilling fluids)

Equivalent Circulating Density (ECD) listed in SLB acronyms table

Rig

Rig up

Geology Terms

Petrofacies Classification

Tectonic Setting

Isopach Mapping

Core Plug Analysis

Seismic Facies

Outcrop Correlation

Depositional Sequence

Subsalt Geology

Structural Trap

Diagenesis

Lithologic Log

Biostratigraphy

Syncline and Anticline

Shale Volume Analysis

Source Rock Evaluation

Unconformity Surface

Facies Change

Geomechanical Properties

Structural Closure

Petrographic Analysis

Reservoir Quality Index (RQI)

Geochemical Fingerprinting

Volcaniclastic Sediment

Organic-Rich Shales

Evaporite Layering

Microfracture Analysis

Formation Dip Angle

Sediment Transport Pathways

Aquifer

Basement

Caprock

Dolomitization

Downdip

Fairway

Fluid contact

Impermeable

In situ

Pay

Pinch-out

Primary migration

Secondary migration

Seal

Sequence stratigraphy

Spill point

Log

Notifications