Fluid loss control additives for use with gravel pack placement fluids
Patent 5415228 Issued on May 16, 1995. Estimated Expiration Date: 
December 7, 2013. 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.
December 7, 2013. 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 3675717 3852201 Method of conducting drilling operations Oil well spacer fluids Water soluble perforation pack Well treatment process Fluid system for controlling fluid losses during hydrocarbon recovery operations Wellbore pressure differential control for gravel pack screen Patent #: 5234055 InventorsAssigneeApplicationNo. 163256 filed on 12/07/1993US Classes:166/278, Graveling or filter forming507/269, Contains inorganic component other than water or clay507/277, Inorganic component is soluble in the well treating medium507/906SOLID INORGANIC ADDITIVE IN DEFINED PHYSICAL FORMExaminersPrimary: Novosad, Stephen J.Attorney, Agent or FirmInternational ClassesE21B 043/04E21B 033/138 AbstractImproved fluid loss control in gravel pack placement fluids is achieved when a fluid loss control additive is provided comprising a selectively soluble particulate having a size of less than 1000 microns and having a linear size distribution when cumulative weight percent is plotted against the logarithm of the particle size. The preferred selectively soluble particulate comprises calcium carbonate.Field of SearchGraveling or filter formingPlacing fluid into the formation Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking formation Specific low fluid loss feature for fluid attacking formation Specific low fluid loss feature for fracturing fluid or cement causes fracture Contains inorganic component other than water or clay Carboxyalkylcellulose (e.g., CMC, CMHEC, etc.) Hydroxyalkylcellulose (e.g., HEC, etc.) |
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