SPE Online Education
Advances in Diagnostic Fracture Injection Testing for Exploration and Development Applications in Unconventional Reservoirs
Recorded On: 02/23/2021
Diagnostic Fracture Injection Tests (DFITs) have become the most popular well-testing method for unconventional reservoir evaluation. The conventional DFIT (or “mini-fracture test”) consists of a sequence of injection, to initiate and propagate a mini-fracture, followed by a shut-in period. The pressure falloff period after shut-in is interpreted for important information used in hydraulic-fracture design such as instantaneous shut-in pressure (ISIP), closure pressure (a proxy for minimum in-situ stress), reservoir pressure and reservoir transmissibility. However, reservoir properties from after-closure reservoir flow regimes may require days or even weeks to obtain using the conventional (pump-in/falloff) DFIT. As an alternative, the author and his research group have proposed a modified DFIT to accelerate the time to reach closure pressure and reservoir information. The new test, referred to as ‘DFIT-FBA’ involves the sequence of pump-in/flowback where reservoir information is obtained from flowback data using classic rate-transient analysis (RTA) methods. Initial field trials indicate DFIT-FBA can be used to obtain reservoir information (e.g. reservoir pressure) in typically < 2 hours, in contrast to days or weeks for conventional DFITs.
In this webinar, the conventional and DFIT-FBA methods are compared and advantages/disadvantages discussed. The speed of DFIT-FBA compared to the conventional DFIT opens up new avenues for application of DFITs. Use of the DFIT-FBA for selecting targets for horizontal wells in an exploration program is demonstrated, as is the first-time application of DFIT-FBA (and DFITs in general) for characterizing along-well reservoir quality variability in a horizontal well. The webinar should be of interest to engineers involved in hydraulic-fracture stimulation design and reservoir characterization.
This webinar is categorized under the Reservoir technical discipline.
All content contained within this webinar is copyrighted by Dr. Chris Clarkson and its use and/or reproduction outside the portal requires express permission from Dr. Chris Clarkson.
Christopher R. Clarkson
Professor, University of Calgary
Christopher R. Clarkson is a professor and holder of the Ovintiv/Shell Chair in Unconventional Gas and Light Oil Research in the Department of Geoscience and an adjunct professor with the Department of Chemical and Petroleum Engineering at the University of Calgary. He leads the industry- and government-sponsored Tight Oil Consortium, which focuses on advanced reservoir characterization and evaluation of unconventional light oil reservoirs. Clarkson holds a PhD in geological engineering from the University of British Columbia. Clarkson was an SPE Distinguished Lecturer for the 2009-2010 lecture season. He is also a certified professional engineer with 11 years of industry experience as a petroleum (reservoir) engineer.
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