What is EOR and its benefits?
Tertiary recovery, also known as enhanced oil recovery (EOR) is a range of production techniques aimed at reducing oil viscosity and improve flow by introducing heat, fluids or gas in the reservoir.
The worldwide average recovery rate from an oilfield is 35%, which means that the majority of oil in a reservoir is not recoverable using traditional recovery methods. Implementing the right EOR technique can increase the recovery factor by up to 60%.
EOR brings clear advantages; by prolonging the life of depleting fields, it defers the capital costs of finding and developing replacement resources.
Mott MacDonald has a solid track record on EOR projects covering the three main methods of EOR:
We were engineering consultants on the US$1.2 billion Qarn Alam Steam Plant in Oman, the world’s first full-field steam injection project based on thermally assisted gas/oil gravity drainage (TAGOGD) in a fractured carbonate reservoir.
Our project won the Engineering Achievement Award at the 2011 Oil & Gas Middle East Awards.
We worked on the Marmul Polymer Flooding Project, the first full-scale polymer project in Oman. With this method water-soluble polymers increase the viscosity of injected water leading to a more efficient displacement of heavy oil. The project won the Enhanced Hydrocarbon Recovery Project Award at the 2010 Oil & Gas Middle East Awards.
Following a successful CO2 injection pilot project in Abu Dhabi, we are currently involved in large scale CO2 injection projects in the Rumaitha and Bab oilfields for our long-term client ADCO. At high pressure, carbon dioxide dissolves into oil reducing its viscosity.