Abstract
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 175937, “Designing an Optimized Surfactant Flood in the Bakken,” by Matthew Dawson, Statoil; Duy Nguyen, Nalco Champion; and Huina Li, Statoil, prepared for the 2015 SPE/CSUR Unconventional Resources Conference, Calgary, 20–22 October. The paper has not been peer reviewed. The Bakken is one of the most prolific plays in North America, but, even with the deployment of horizontal wells and hydraulic fracturing, anticipated recovery factors under primary depletion are usually in the range of 10 to 20%. Waterflooding has been a commonly deployed technology in conventional reservoirs to enhance recovery beyond primary depletion. However, the Bakken’s ultratight, largely oil-wet nature limits the potential of waterflooding. As an alternative, an optimally spaced well-to- well surfactant-flooding technology is proposed. Introduction Recent studies focusing on wettability alteration by use of surfactant in the Bakken have shown strong potential. Spontaneous-imbibition tests in Bakken cores show recovery factors that can exceed 30% and sometimes achieve up to 60%. However, in an ultralow-permeability system, the rate of surfactant imbibition is perhaps more important than the ultimate recovery factor. Initial studies show potential, but to achieve an economical surfactant recovery process, ultrahigh imbibition rates must be achieved. In addition to the technical challenges associated with stability, compatibility, and injectivity, economical deployment of surfactant in a marginally profitable play such as the Bakken is another major challenge. To minimize the surfactant required for a successful process, a surfactant would ideally have an ultralow critical micelle concentration (CMC) and low adsorption while maintaining key performance indicators that are discussed in the complete paper.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.