ABSTRACT
Until 1983, traditional cement squeeze techniques were used to shut off excess water production from wells in the Forties Field. The success rate was low, some 50% of workovers failing within 5 days of the well being returned to production.
Casing patches over 120 feet long are now being run to cover the squeezed off perforations and workover effectiveness has increased dramatically. Radioactive tracers are employed to ensure accurate depth control as the patches are run and set on drillpipe.
It is envisaged that continuous patches could be run when extremely long perforated intervals are encountered and alternative uses, e.g., to repair mechanically damaged casing, can be foreseen.
Copyright 1985, Society of Petroleum Engineers
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