Invention Grant
- Patent Title: Oil recovery by sequential waterflooding with oil reinjection and oil relocation
- Patent Title (中): 油回采采用顺序注水与油回注和油搬运
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Application No.: US12936870Application Date: 2009-04-07
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Publication No.: US08413718B2Publication Date: 2013-04-09
- Inventor: Norman R. Morrow , Sheena Xina Xie , Nina Loahardjo
- Applicant: Norman R. Morrow , Sheena Xina Xie , Nina Loahardjo
- Applicant Address: US WY Laramie
- Assignee: University of Wyoming
- Current Assignee: University of Wyoming
- Current Assignee Address: US WY Laramie
- Agency: Cochran Freund & Young LLC
- Agent Samuel M. Freund
- International Application: PCT/US2009/039825 WO 20090407
- International Announcement: WO2009/126663 WO 20091015
- Main IPC: E21B43/20
- IPC: E21B43/20 ; E21B43/22

Abstract:
A method for enhancing oil recovery from reservoirs is described. The method includes partially recharging zones of pore space in a reservoir that has been previously waterflooded to extract oil, in order to obtain increased ultimate oil recovery by re-waterflooding the recharged zones. The recharging may be achieved by either reinjection of oil or by change in injection scheme, such as changing an oil producing well to a water injection well. This procedure of recharging with oil followed by waterflooding may be repeated. Application of the present method to increase recovery from reservoirs producing dry (water-free) oil to mature reservoirs which produce at high water-to-oil ratios is anticipated.
Public/Granted literature
- US20110036580A1 OIL RECOVERY BY SEQUENTIAL WATERFLOODING WITH OIL REINJECTION AND OIL RELOCATION Public/Granted day:2011-02-17
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