TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractContinuous improvement measured in time savings required to sidetrack and redrill 133 shallow wells is documented. Time savings and a learning curve are related to decision making through a catalogue of sequential, applied techniques. Paralleling the evolution of applied techniques at the wellsite, bit and reamer technology evolves. Steer and ream while drilling tools (SRWD) evolve and make the sidetrack program viable. The confluence of geology, reservoir character as well as existing/new technology and management philosophy results in forecastable, positive changes. The incremental improvements produce a multi-year sidetrack program to successfully exploit the mature Elk Hills oil field.
A multi-disciplinary study combining reservoir, completion and production information enables understanding of how to optimize completion strategies and enhance well productivity. This study focuses on the Eagle Ford shale formation in northern LaSalle County. A data-driven approach is followed by first identifying general trends in completion designs from around 50 horizontal wells. The study aims to identify parameters that have the most influence on production in the Eagle Ford shale formation. Multivariate analysis was implemented to determine which completion parameters are the main production drivers. Special attention was given to dataset filtering and processing. Comparing well productivity across an entire play like the Eagle Ford can be challenging because reservoir characteristics change and operators employ various field development and completion design strategies. The study minimizes variations in geology and completion schemes by focusing on a 6-mile diameter area. Variation in completion design is also minimized by only considering newly completed wells with similar hydraulic treatment designs. In addition to production trends, the use of stress profiles, rock properties and microseismic clouds are investigated to constrain modeling of fracture length and height.
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