This paper presents a study of low-permeability gas wells located in the Rocky Mountain foothills of Alberta, Canada, where production enhancement often involves various stimulation techniques to improve well production. We evaluated conventional techniques to a novel fracturing technique using the latest in fracturing fluid and coiled tubing technologies to concurrently and selectively place fracture treatments into multiple pay zones or stringers.

The coiled-tubing hydraulic stimulation technique was an excellent method for stimulating multi-zone wells, resulting in savings of $300,000 per well on the three Wildcat Hills Viking wells. The minimal operation and improved clean up time accounts significantly in being able to bring the wells on production 4 to 8 days sooner than with conventional methods for multi-zone wells.

Our approach describes the background, history and the impact of our successful utilization of coiled-tubing technology to convey hydraulic fracturing in the Wildcat Hills. The impressive benefits of this alternate and selective approach is improved control of net height and optimized effective fracture length. In addition to the substantial return in favorable production and economics, the design is acceptable for use in the ecologically sensitive area of the Canadian Rockies.

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