Dual or twin-well completion with wettability alteration for segregated oil and water production
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United States of America Patent
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Mar 22, 2016
Grant Date -
Jan 31, 2013
app pub date -
Jul 27, 2011
filing date -
Jul 27, 2011
priority date (Note) -
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Abstract
A well completion and related method are provided for formations susceptible to simultaneous production of oil and water. In one embodiment, two closely spaced, preferably horizontal wellbores are drilled from a single well into the reservoir. The reservoir rock surrounding one leg (typically the upper leg) is chemically treated to make it hydrophobic, whereas the reservoir rock surrounding the other leg is chemically treated to make it hydrophilic. Separate production tubing and a dual completion is installed in order to enable independent flow from each leg. Drawdown pressures in both legs are controlled to be sufficiently close to each other such that only oil flows into one leg and only water into the other. The water produced is re-injected downhole or brought to the surface.
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