Abstract
Abstract Steam injection is a successful operation to increase heavy-oil production, but the casing failure rates in steam injection wells are very high. Severe thermal-loading to the casing is resulted from steam injection operations and is attributed to the high casing failure rates. The casing failures can be casing parted due to fatigue and/or tensile load at cooling period, and can also be casing ID restriction due to collapse and/or severe buckling. This paper will briefly review the common casing design practice, and provide mathematical modeling of casing stresses in steam injection wells, and discuss ways of reducing casing failures, including the use of high strength casing (such as P-110 grade) to reduce casing hot-yield in most steam injection wells. The field data at Cymric 1Y field, Bakersfield, California are also presented to support the use of high strength casing (P-110 grade) in steam injection wells, based on the reduction of casing failures in the past two years.
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