Reservoir Engineering

Reservoir engineering is a specialized branch of petroleum engineering that applies scientific principles to the drainage problems arising during the development and production of oil and gas reservoirs.  At its core, the discipline is tasked with maximizing the economic recovery of hydrocarbons from subsurface geological formations.  This requires a sophisticated understanding of the physical properties of the rock, such as porosity and permeability, and the complex behavior of the fluids, oil, gas, and water, trapped within those pores under extreme pressure and temperature.  By integrating geological data with fluid mechanics, reservoir engineers estimate the initial volumes of hydrocarbons in place and forecast future production rates under various operating scenarios.

To manage these underground assets effectively, engineers rely on material balance, which accounts for every unit of fluid produced or injected to ensure the conservation of mass within the system.  They utilize advanced numerical simulation models to predict how a reservoir will respond to different recovery strategies, such as primary depletion, waterflooding, or enhanced oil recovery (EOR) techniques like CO2 injection.  The engineer's role is a continuous cycle of data acquisition and analysis: they interpret pressure transient tests and production logs to refine their models, ensuring that the placement of wells and the rate of extraction are optimized to prevent waste and extend the productive life of the field.  Ultimately, reservoir engineering providing the technical foundation for investment decisions in the energy industry.

Reservoir Types

Oil and gas reservoirs are classified based on several criteria, including the nature of the hydrocarbons they contain, the geological formations, and the types of traps that contain them.

Based on Hydrocarbon

Based on Geological Structure

Based on Reservoir Drive Mechanism

Based on Fluid Phases

Understanding the type of reservoir is needed in determining the appropriate extraction methods and predicting the production behavior of the reservoir.