Abstract
During most completion and workover operations an overbalanced fluid column forms the primary well control barrier, preventing an influx of reservoir fluid. If the primary barrier fails and reservoir fluids enter the wellbore, surface well control equipment is used to secure the well. Since surface equipment is classified as the secondary well control barrier, it must be able to close in and secure the well at all the different stages of a completion or workover operation. It must also be configured in a way that allows the primary barrier to be restored. During drilling operations, restoration of the primary fluid barrier is normally achieved by circulating heavy (overbalanced) fluid into the well and circulating out the formation fluid. Properly configured well control equipment will allow shut-in with and without pipe in the well, and also drill pipe and completion tubulars to be cut.
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