Wells – Processes – Distinct – separate injection and producing wells
Patent
1984-09-19
1986-03-11
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166246, 252 855D, 2523153, E21B 4322
Patent
active
045748870
ABSTRACT:
A method of preparing viscous aqueous liquids containing Xanthomonas polysaccharides for injection into wellbores. The Xanthomonas polysaccharide is dispersed into relatively fresh water. This dispersion of polysaccharide is then mixed with a relatively saline aqueous makeup solution to provide the final thickened aqueous liquid. Trivalent metal ions may be incorporated in the polysaccharide dispersion prior to the addition of the aqueous saline solution in order to complex the polysaccharide. The complexed polysaccharide solutions are useful for selectively blocking high permeability regions in stratified reservoir formations by injecting the complexes into the formation at shear rates which cause a reversible disruption of the complex; the disrupted complexes penetrate the high permeability regions and when the shearing forces decrease at a certain distance from the wellbore, the complexes re-form to block the high permeability regions selectively.
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Gilman Michael G.
Keen Malcolm D.
McKillop Alexander J.
Mobil Oil Corporation
Suchfield George A.
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