Polymer treatment isolates depleted zone, enabling untapped-zone production

A polymer treatment isolated a watered-out zone and enabled production from a lower, previously untapped zone in a Gulf of Mexico (GOM) well, operated by Marathon Oil Co.Marathon estimates that the cost of the work (Figs. 1a-1d), performed rigless and through coiled tubing, was about 35% of the cost for a workover rig recompletion. Click here to enlarge imageOn a 12/64-in. choke, initial gas production from the newly activated zone was 1.7 MMscfd and 38 b/d of condensate, with no sand or water production. After an increase in choke size to 14/64 in., the well has continued to produce water and sand-free at about 2.3 MMscfd and 16 b/d of condensate for 1 year.Polymer water blockThe polym...

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