Foamed drilling fluids, their process for preparation and the corresponding drilling method
Patent 5821203 Issued on October 13, 1998. Estimated Expiration Date: 
June 7, 2016. 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.
June 7, 2016. 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 3323593 Composition and method for drilling high temperature reservoirs Controlling corrosion in gas-containing aqueous drilling fluid Corrosion inhibitor for wellbore applications Patent #: 5565416 InventorAssigneeApplicationNo. 612838 filed on 06/07/1996US Classes:507/102, Contains intended gaseous phase at entry into wellbore166/309, Producing foam or gas in well by foaming or gas producing material507/111, Carbohydrate is starch or derivative thereof507/113, Carboxyalkylcellulose (e.g., CMC, CMHEC, etc.)507/140, Contains inorganic component other than water or clay507/141, Inorganic component contains soluble potassium salt507/145Inorganic component is soluble in boring mediumExaminersPrimary: Tucker, PhilipAttorney, Agent or FirmForeign Patent References
International ClassC09K 007/02Foreign Application Priority Data1994-08-04 FRAbstractThe present invention is directed to an aqueous foamed Drilling Fluid for drilling well bores into a subterranean formation, comprising water, at least one clay and at least one foaming agent. According to the invention, it further comprises at least one metal hydroxide. The invention further relates to a method for preparing said foamed drilling fluid.Other References
Field of SearchContains intended gaseous phase at entry into wellboreContains intended gaseous phase at entry into wellbore Carbohydrate is starch or derivative thereof Carboxyalkylcellulose (e.g., CMC, CMHEC, etc.) Contains inorganic component other than water or clay Inorganic component contains soluble potassium salt Inorganic component is soluble in boring medium Producing foam or gas in well by foaming or gas producing material |
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