PanCanadian Petroleum Limited, operator of the Weyburn Unit in southeastern Saskatchewan, Canada, has been involved in the development and application of underbalanced and multi-lateral drilling technologies to access reserves which otherwise were likely to be uneconomic to develop. In an attempt to optimize the mature waterflood in the Weyburn field, both vertical and horizontal infill wells have been drilled over the last 12 years. The most success has been realized from horizontal wells, which have evolved from single laterals to dual laterals to quad laterals. The combination of multi-lateral wells and properly designed underbalanced drilling techniques has resulted in increased reservoir access, significant decreases in the cost of reservoir access, and decreased formation damage. Continued exploitation of remaining reserves has been accomplished by progressively pushing the development of new technology to meet the changing economic and technical demands imposed by drilling in different parts of the Unit.

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