Microbial process for selectively plugging a subterranean format

Details Microbial process for selectively plugging a subterranean format Microbial process for selectively plugging a subterranean format

1987-11-19

1989-01-31

Suchfield, George A.

Wells

Processes

Using microorganisms

166294, 435852, 435877, E21B 4322, E21B 33138

Patent

active

048009598

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.

REFERENCES:
patent: 4250264 (1981-02-01), Nelson et al.
patent: 4350769 (1982-09-01), Kang et al.
patent: 4460043 (1984-07-01), Thompson et al.
patent: 4558739 (1985-12-01), McInerney et al.

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