Microbial process for selectively plugging a subterranean formation
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United States of America Patent
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Jan 31, 1989
Grant Date -
N/A
app pub date -
Nov 19, 1987
filing date -
Nov 19, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A microbial process is provided for selectively plugging a high permeability stratum or zone in a subterranean reservoir. Starved bacteria of reduced size are injected into the zone. A poor-nutrient media is either simultaneously or subsequently thereafter injected into the zone to substantially uniformly resuscitate the starved bacteria. Thereupon, the bacteria regain full cell size, proliferate, and commence production of biofilm-forming exocellular polysaccharides. The biofilm is functional to selectively seal off the high permeability zone of the formation and reduce aqueous flow through the zone.
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