Petroleum Engineering Cheat Sheet

The core ideas of Petroleum Engineering distilled into a single, scannable reference — perfect for review or quick lookup.

PiqCue — piqcue.com/petroleum-engineering/cheatsheet

Quick Reference

Reservoir Engineering

The subdiscipline focused on understanding fluid flow behavior within porous rock formations, estimating reserves, and forecasting production rates using material balance equations, decline curve analysis, and numerical reservoir simulation.

Drilling Engineering

The branch of petroleum engineering responsible for designing and executing the wellbore, including selecting drill bits, casing programs, drilling fluids (muds), and well trajectories to safely and efficiently reach target formations.

Enhanced Oil Recovery (EOR)

Tertiary recovery techniques applied after primary depletion and secondary waterflooding to extract additional oil. Common methods include CO2 injection, steam flooding, polymer flooding, and chemical surfactant injection that alter fluid properties or rock-fluid interactions.

Petrophysics

The study of rock and fluid properties in the subsurface, typically evaluated through wireline well logs, core analysis, and formation testing. Key properties include porosity, permeability, water saturation, and lithology.

Hydraulic Fracturing

A well stimulation technique in which high-pressure fluid is injected into a formation to create fractures in the rock, which are then held open by proppant (typically sand or ceramic beads), dramatically increasing the permeability and flow rate to the wellbore.

Production Engineering

The subdiscipline that designs and optimizes the equipment and processes used to bring hydrocarbons from the reservoir to the surface, including artificial lift systems, well completions, flow assurance, and surface separation facilities.

Darcy's Law

The fundamental equation governing the flow of fluids through porous media, stating that flow rate is proportional to permeability, cross-sectional area, and pressure gradient, and inversely proportional to fluid viscosity. It is the cornerstone of reservoir fluid flow analysis.

Well Logging

The practice of making detailed measurements of the geophysical properties of rock formations penetrated by a wellbore using specialized downhole instruments. Logs provide continuous data on resistivity, porosity, density, sonic velocity, and natural radioactivity.

Material Balance Equation

A fundamental reservoir engineering tool that applies the conservation of mass to a reservoir system, relating cumulative production, fluid expansion, water influx, and pore volume compaction to estimate original hydrocarbons in place and predict future performance.

Well Completion

The process of making a drilled well ready for production, including installing casing and cement, perforating the production interval, setting tubing and packers, and installing surface flow control equipment (the Christmas tree or wellhead).

Key Terms at a Glance

API Gravity:An inverse measure of crude oil density developed by the American Petroleum Institute. Higher values indicate lighter oil.

Artificial Lift:Mechanical methods used to bring reservoir fluids to the surface when natural reservoir pressure is insufficient for flow.

Blowout:An uncontrolled release of oil or gas from a well after pressure control systems have failed.

Casing:Steel pipe cemented in the wellbore to maintain structural integrity and provide zonal isolation between formations.

Christmas Tree:The assembly of valves, spools, and fittings installed on the wellhead to control the flow of produced fluids at the surface.

Completion:The process of preparing a drilled well for production, including perforating, installing tubing, and fitting surface equipment.

Decline Curve Analysis:A method of forecasting future production by fitting historical production data to mathematical decline models.

Directional Drilling:The practice of drilling non-vertical wellbores to reach subsurface targets not directly below the surface location.

Enhanced Oil Recovery (EOR):Tertiary techniques that alter rock or fluid properties to mobilize additional oil beyond primary and secondary recovery.

Formation Volume Factor:The ratio of a fluid's volume at reservoir conditions to its volume at standard surface conditions, accounting for dissolved gas and thermal expansion.

Gas-Oil Ratio (GOR):The volume of gas produced per unit volume of oil at standard conditions, typically expressed in scf/STB.

Hydraulic Fracturing:A stimulation technique that creates fractures in rock by injecting fluid at high pressure, which are then held open by proppant.

Kick:An unintended influx of formation fluid into the wellbore, occurring when formation pressure exceeds the hydrostatic pressure of the drilling fluid column.

Perforating:The process of creating holes through the casing and cement into the formation to establish a flow path for reservoir fluids.

Permeability:A measure of a rock's ability to allow fluids to pass through it, measured in darcies or millidarcies.

Get study tips in your inbox

We'll send you evidence-based study strategies and new cheat sheets as they're published.

We'll notify you about updates. No spam, unsubscribe anytime.