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SPE OKC Luncheon - 20 October 2016 - "Hydraulic Fracturing of a Clay Rich Formation in Southern Chile" - Larry K. Britt 

10-24-2016 11:51 AM

Abstract The Glauconite Formation in southern Chile is an unconventional resource made up of approximately forty percent clay and glauconite, thirty-four percent feldspar, twenty-three percent quartz, and three percent tuff. Production is from the Magallanes Basin which is the southern most hydrocarbon producing basin in the world. Like many unconventional reservoirs outside the United States, establishing commercial production from the Glauconite Formation was difficult given the make-up of the reservoir, the availability of equipment and materials, and the logistics associated with drilling, completing, and fracture stimulating wells in a remote area like Tierra del Fuego in southern Chile. This paper describes the effort to establish commercial production from the Glauconite Formation beginning with a couple of marginal wells in late 2011 through a nearly seventy-five well development by early 2016. As part of this effort, a basis of fracture design was established by developing a profile with depth of in-situ stress, Young’s Modulus, and leak-off coefficient. These geomechanical assumptions were then tested and modified with core and pump-in data and used to make revisions to the fracture stimulation design. The designs were optimized to ensure that the critical fracture dimensions (fracture length, conductivity, and height) were achieved to maximize well performance. Next, a data collection plan was developed to capture key information about completions, mini-frac analysis, fracture design and execution, fluid, proppant, and chemical additives, reservoir quality, and post fracture flowback and clean-up data. The database was then utilized to monitor the Glauconite fracture stimulation program to ensure that the basis of design for the fracture program maintains viability and to ensure that the appropriate equipment and materials were mobilized for fracture optimization and to meet the program objectives. This paper focuses on the key elements of well completions and fracture stimulation practices as they apply to tight gas and unconventional formations by using the database to manage project risks and develop appropriate mitigation strategies even in a remote environment. Biography Larry K. Britt is a partner with NSI Fracturing and owns and operates Britt Rock Mechanics Laboratory at the University of Tulsa. Prior to joining NSI, Britt was the fracturing team leader at Amoco’s Technology Center charged with managing the development and application of fracturing technology for their worldwide operations. Britt is a Distinguished Member of the SPE, has twice served as an SPE Distinguished Lecturer, as a JPT editor, and on numerous SPE Committees. In addition, Larry has authored over forty technical papers as well as co-authored the SPE Primer on the “Design and Appraisal of Hydraulic Fractures.” Larry has a B.S. in Geological Engineering and a Professional Degree in Petroleum Engineering from the Missouri University of Science and Technology where he is an adjunct professor, a member of both the Petroleum Department and Engineering Advisory Boards, and a member of the Academy of Mines and Metallurgy.

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Uploaded - 10-24-2016