Inventors:
Brent L. Estes - Houston TX
Cory J. Bernu - Farmington MN
Assignee:
Halliburton Energy Services, Inc. - Duncan OK
International Classification:
E21B 3302
US Classification:
507209, 507110, 507111, 507211, 507212, 507213, 166292
Abstract:
A process and composition are provided for permeability reduction in a hydrocarbon-bearing formation to improve hydrocarbon recovery therefrom. A moderately epichlorohydrin cross-linked, non-hydroxylpropylated starch is derived from high amylopectin waxy maize starch for use in drilling, workover and completion fluids. The starch is combined with xanthan gum and used in solutions of fresh water, non-saturated brine or saturated brine containing sized salt particles, typically sodium chloride, of various sizes, or sized calcium carbonate, or a combination of sized salt and sized calcium carbonate.