This paper details a new enhanced oil recovery (EOR) method successfully piloted by several operators in the Bakken and recently implemented in the Midland play of the Permian Basin. This EOR method uses a patented coinjection process injecting both produced water and natural gas. Single-well tests have established a gas-utilization factor (GUF) in the 4 Mscf/BO range, which is excellent when compared with other EOR processes.
Introduction
Surfactant injection has generated recent interest with successful pilots and projects in the Permian and Eagle Ford. These surfactant treatments have been implemented as opportunistic well treatments rather than a continuous EOR process, but generally have been more economic.
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