Evaluation of Cement Systems for Oil and Gas-Well Zonal Isolation in a Full-Scale Annular Geometry
Authors:
- 15 March 2005
- journal article
- Published by Society of Petroleum Engineers (SPE) in SPE Drilling & Completion
- Vol. 20 (01) , 44-53
Abstract
Summary: Loss of zonal isolation in a wellbore can be caused by mechanical failure of the cement or by development of a microannulus. However, behavior of the sealant is driven by specific boundary conditions such as rock properties. Large-scale laboratory testing of the cement sheath in an annular geometry and a confined situation was performed to simulate various downhole stress conditions and evaluate the behavior of several sealants. Failure modes of the cement sheath were determined as a function of cement mechanical properties, loading parameters, and boundary conditions. Results were used to validate an analytical model that predicts cement-sheath failure.Keywords
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