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Background Waterflooding is a common method of secondary oil recovery in unconventional shales that can boost production and recovery by 20 to 40%. Waterflood effectiveness, however, has been limited by uneven water injection along the lateral, leading to inefficient sweep patterns and “short circuits” that bypass significant recoverable oil. To date, operators have had limited options for managing the injection profile, whether in new-drill or converted production wells. The two most common options are: Bullhead injection down unsegmented production casing. In an attempt to improve distribution, operators have employed chemical and polymer diverters and mechanical diversion utilizing bridge plugs and isolation packers, with unsatisfactory and unpredictable results. At a higher cost, operators can segment a wellbore by installing retrofit systems comprising injection-control devices and isolation packers on production tubing; however, orifice plugging and erosion inevitably degrade sweep performance, leading to costly intervention operations. Now a new option offers both sweep efficiency and economy: the Innovus TM Convertible frac sleeve, from NCS Multistage . Innovus Convertible frac sleeves: a more effective waterflood injection solution Installed as part of the original completion string, Innovus TM Convertible frac sleeves can be converted post-frac or post-production to a regulated water-injection mode in a […]
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