1
Judith Gockel: Lost circulation drilling fluid. Neal J Mosely, February 12, 1985: US04498995 (156 worldwide citation)

A drilling mud, or other drilling fluid containing particulate expanded aggregates is effective to seal the fractures and openings and prevent lost circulation of the mud or fluid in a well. The expanded aggregates used are inorganic clays, shales and slates which are heat treated at temperatures up ...


2
MODIFIED BIOPOLYMERS AND METHODS OF PRODUCING AND USING THE SAME. January 5, 2017: US20170002098-A1

Modified biopolymers, such as, charge-modified biopolymers, cross-linked biopolymers, and cross-linked, charge-modified biopolymers are provided along with methods of producing and using the same.



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