Remedial well bore sealing methods and compositions
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, David D. Onan, Roger S. Cromwell
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Abstract
The present invention relates to improved methods and compositions for sealing subterranean zones penetrated by well bores to reduce their permeabilities and increase their compressive strengths. The methods basically comprise the steps of introducing an aqueous sealing composition into a subterranean zone comprising a polymerizable monomer, a polymerization initiator, a hardenable epoxide containing liquid and a hardening agent, placing the sealing composition by way of the well bore into the subterranean zone and allowing the sealing composition to polymerize and harden whereby the well bore is sealed.
Claims21
A method of sealing a subterranean zone penetrated by a well bore and simultaneously improving the mechanical strength of the zone comprising the steps of:
- introducing a polymeric epoxide composition into said zone which forms an impermeable sealing mass therein, said composition comprising a polymerizable monomer, a polymerization initiator, a hardenable epoxide containing liquid and a hardening agent;
- and then
- allowing said monomer to polymerize and said epoxide liquid to harden.
A method of sealing a subterranean zone penetrated by a well bore to reduce its permeability and increase its mechanical strength comprising the steps of:
- introducing an aqueous composition into said zone which forms an impermeable sealing mass therein, said composition comprising a polymerizable monomer comprising
- hydroxyethylacrylate present in an amount in the range of from about 10% to about 90% by weight of said composition,
- a polymerization initiator comprising 2,2'-azobis(2-amidinopropane) dihydrochloride present in said composition in an amount in the range of from about 0.01% to about 2% by weight of said monomer in said composition,
- a hardenable epoxide containing liquid comprising the diglycidyl ether of 1,4-butanediol present in said composition in an amount in the range of from about 10% to about 90% by weight of said composition,
- a hardening agent comprising diethyltoleuenediamine present in said composition in an amount in the range of from about 25% to about 45% by weight of said epoxide containing liquid in said composition;
- and
- causing said monomer to polymerize and said epoxide containing liquid to harden.
A composition which forms an impermeable sealing mass for use in well remedial operations comprising:
- a polymerizable monomer present in an amount in the range of from about 10% to about 90% by weight of said composition;
- an effective amount of a polymerization initiator;
- a hardenable epoxide containing liquid present in said composition in an amount in the range of from about 10% to about 90% by weight of said composition;
- an effective amount of a hardening agent.
Dependencies are inferred from the claim text.