Abstract

Horizontal multistage fracture stimulation techniques have strategically advanced the completion and stimulation development in the Viking formation. Conventional Viking plays were vertically drilled, produced and thought to be depleted, but are now resurfacing with new opportunities.

The combination of being able to reach further with wellbore lengths and increase stimulation intensity has contributed to the viability of unconventional resources. As a direct result, various stimulation technologies have emerged and evolved, such as coiled tubing straddle systems, ball drop systems, and sliding sleeves with a resettable frac-isolation tool. These completion technologies have revived and renewed interest in challenging plays and have made it possible to economically stimulate portions of the reservoir that were previously bypassed. Implementing multistage technologies in the Halkirk, Provost and Dodsland fields have created positive and noticeable production results. Operators have begun to explore and revisit areas that may have been overlooked or less obvious. With improvements in technology and techniques for horizontal multistage stimulation treatments, areas like Prairiedale, Kerrobert, Lucky Hills, Plato and Forgan are capturing attention.

This case study seeks to investigate and discuss stimulation treatments, technology, and completion efficiency, which includes a case history describing how an operator completed in excess of 100 wells in the Kerrobert Viking play. It is located in southwest Saskatchewan, Canada, and lies below the Base of Fish Scales and above the Joli Fou. It will highlight key foreseen and unexpected challenges that arose in this play. Despite the challenging average 6 m pay thickness and interbedded layers of sandstone, siltstone and shale, production continues to proliferate within the Kerrobert Viking pool. Contributions of strategic horizontal drilling and multistage stimulations have improved efficiencies and reduced completion cycle time. This play has relatively low completion costs, is predictable, and therefore demonstrates repeatable economic results.

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