RESERVOIR ENGINEERING
Reservoir Engineering
Learning Objectives of Lecture 1:
Define/describe a reservoir Define Reservoir Engineering Describe/list role/functions of Res. Eng. State objectives of Res. Eng. Pet. Res. Hyrdrocarbon (HC) fluids Classification based on phase diagram Types/forms reservoir energies
How many reservoirs? What are the trapping mechanisms?
DEFINITIONs OF RESERVOIR ENGINEERING
Craft “The application of scientific principles to the drainage problems arising during the development and production of oil and gas reservoirs”.
the bubble point preCOVERY
Recovery (production): is the displacement of oil and gas towards the production wells and to the surface, and divided into:
rate) the oil recovery
Petroleum reservoir HC fluids
Oil Reservoirs - Produce mainly oil and gas and in some cases also water
- Heavy oil - Conventional oil
DEFINITIONs OF RESERVOIR ENGINEERING
Colhoun “The phase of engineering which deals with the transfer of fluids to, from or through the reservoirs”.
Functions OF RESERVOIR
– Primary recovery – Secondary recovery – Enhanced oil recovery
STAGES OF OIL RECOVERY
Primary Recovery Production is accomplished through the use of natural energy of the reservoir.
Reservoir Engineering
Branches of Petroleum Engineering: Drilling engineering Production engineering Reservoir engineering.
Definition of a Reservoir
A reservoir is that portion of a trap which contains oil and/or gas as a single hydraulically connected system. -it is a rock layer -porous so that stores oil -permeable so that allows flow of oil -has a mechanism to prevent escape of oil(trapping mechanism)
- Black oil - Volatile oil
Gas Reservoirs - Produce mainly gas and in some cases also water
- Dry gas - Wet gas Gas Condensate Reservoirs - Produce gas which contains hydrocarbon liquid
the movement of fluids through the reservoir so that
Objectives of reservoir engineering
we can a) enhance ( increase recovery factor)
and b) accelerate ( increase production
- Gas condensate
PHASE DIAGRAM OF RESERVOIR FLUIDS
Phase Diagram of Black Oil
Phase Diagram of Dry Gas
Phase Diagram of Wet Gas
Phase Diagram of Gas Condensate
CLASIFICATION OF OIL RESERVOIRS
Under Saturated Oil Reservoirs - Reservoir pressure is initially above
the bubble point pressure Saturated Oil Reservoirs - Reservoirs pressure is initially below
ENGINEERING
To continuously monitor the reservoir and collect relevant data and interpret it to be able to
1. Determine (present conditions)) 2. Estimate ( future conditions) and 3. Control