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As stated earlier, during the Plateau Phases of the field life-cycle, multiple Reservoir Management activities occur. If the field or reservoir is being developed with a Phased Development (development performed in distinct phases), then the drilling of wells required in the later phases of the development occurs.
During this phase, the drilling rig is often used for activities other than drilling. As discussed in earlier, the production of unwanted fluids from the reservoir may require the drilling rig to be used for major rig workovers. These MRWOs require the use of the rig to perform well remediation activities that cannot be performed using a Slickline (a non-electrical conducting wire used to run workover tools), a Wireline (an electrical conducting wire used to run these tools), or coiled tubing (tubing wound on large spools which can be run using a non-rig Coiled Tubing Unit). Workovers requiring a MRWO include some Secondary Cementing Operations (repairing poorly cemented casing sections that were not properly cemented during the original – or Primary Cementing Operations or Squeeze Cementing Operations – Zonal Isolation technique of forcing cement into perforation intervals producing unwanted fluids), pull tubing for tubing change-out operations, pulling the tubing and completion to recomplete the well, deepening the well, milling operations, etc.