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AbstractThis paper describes the application of a nondamaging temporary gel system to isolate a part of a horizontal section in an openhole well. The purpose of this application was to provide a cost effective method of isolating a high watersaturated zone of the extended lateral to facilitate the production of hydrocarbon from the rest of the open hole.The candidate well (R-91) selected for this application was the first extended lateral horizontal well (3000-ft lateral section) drilled as a producer. The well was to be converted to an injector at a later time.Logging while drilling (LWD) was performed during the drilling phase of this well, and a low-resistivity section was identified along the horizontal lateral. On completion of the drilling, a well test was performed, indicating a high water cut. It was suspected that this water was being produced from this low resistivity section along the lateral hole.An economical method for confirming and isolating the source of this water influx was needed. Since this was a lowpressure well, an electric submersible pump (ESP) for production had been used. Since low-pressure wells were the norm for this field, ESP completions were commonplace. Different techniques, including use of drillpipe conveyed or coiled-tubing-conveyed production logging tool (PLT) were also considered.The nondamaging gel plug placed across the low resistivity section of open hole with coiled-tubing allowed the operator to identify and confirm the source of water. The gel
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