Extreme-Environment Cementing in the Schoonebeek Heavy-Oil Field

摘要

The Schoonebeek heavy-oil field was first developed by Nederlandse Aardolie Maatschappij B.V. in the late 1940s. Because of economics, it was abandoned in 1996. In 2008, the Schoonebeek Redevelopment Project, using a gravity-assisted-steamflood (GASF) design concept, was initiated with 73 wells (44 producers, 25 injectors, and four observation wells). A key design requirement was long-term integrity of the cement sheath over an expected 25- to 30-year field life span. Complicating this requirement was the need for systems to place lightweight cement because lost-circulation issues were expected in both hole sections, particularly in the mechanically weak Bentheim sandstone.