Process for restoring the permeability of a subterranean formation
Patent 5038864 Issued on August 13, 1991. Estimated Expiration Date: 
May 10, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 10, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2221353 3131759 3757861 Method for stimulating wells completed in oil bearing earth formations 4090562 Stimulation of oil and gas wells with phosphate ester surfactants Use of peroxide in waterflood oil recovery Method for restoring permeability of injection wells Method for stimulation of oil and gas wells with phosphate ester surfactants Enhanced oil recovery InventorsAssigneeApplicationNo. 521795 filed on 05/10/1990US Classes:166/300, Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant)166/305.1, Placing fluid into the formation166/312, Liquid introduced from well top507/238, Organic component is a phosphate ester507/266, Organic component contains an alcohol group507/929Cleaning organic contaminantExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmInternational ClassE21B 037/00AbstractA process for restoring the injectivity of a well penetrating and in fluid communication with a subterranean formation wherein an aqueous treating solution comprising a mixture of an aqueous solution having no more than 30 weight percent of hydrogen peroxide dissolved therein and a mutual solvent is injected via the well to contact polymer accumulation so as to degrade and disperse same. The mutual solvent comprises alcohol, aromatic hydrocarbon, and an alkyl or alkylaryl polyoxyalkylene phosphate ester surfactant.Field of SearchCyclic injection then production of a single wellInjecting a composition to adjust the permeability (e.g., selective plugging) Injected fluid comprises water and material other than inorganic gas Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant) Dissolving or preventing formation of solid oil deposit Placing fluid into the formation Liquid introduced from well top |
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