Expandable liners isolate water influx from directional, horizontal wells

A concept that employs expandable-profile liners, developed to shutoff high-pressure water flows in drilling operations, has proven to be effective for isolating water influx from directional and horizontal well sections.The operator OAO Tatneft pioneered the technology in Russia.The company employed a viscous-hydrophobic emulsion and expandable-profile liners to isolate 30 m from the end and an 82-m section in the middle of the horizontal lateral of Onbiyskoye oil field well No. 11251-G.1 2The job successfully isolated water entry allowing the well's production rate to increase from 2.0 tonnes/day at 95% water cut to stabilized water-free oil production of 18-20 tonnes/day.Horizontal...

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