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AssigneeHalliburton Energy Services, Inc.
InventorsBilly F. Slabaugh, Jimmie D. Weaver, Trinidad Munoz JR., Bradley L. Todd
Estimating the term…
Methods and compositions for sealing subterranean zones having temperatures in the range of from about 80° F. to about 300°F. are provided. A method of the invention is basically comprised of the steps of providing a subterranean zone sealing composition that becomes substantially rigid when exposed to subterranean zone temperatures above about 80° F. and has a pH above about 8.5 comprised of water, a substantially fully hydrated depolymerized polymer and a cross-linking agent. The sealing composition is introduced into the subterranean zone whereby it becomes rigid and seals the zone. The sealing composition can subsequently be removed by contact with a fluid having a pH below about 8 when a boron compound is utilized as the cross-linking agent.
A method of sealing a subterranean zone having a temperature above about 80° F. to prevent the uncontrolled flow of fluids into the zone comprising the steps of:
A subterranean zone sealing composition that becomes rigid when exposed to subterranean zone temperatures above about 80° F., that has a pH above about 8.5 and that can be removed by contact with a fluid having a pH below about 8 comprising:
Dependencies are inferred from the claim text.