Many methods are presented including one that comprises: providing a well drill-in and servicing fluid comprising an aqueous fluid, a viscosifier, a fluid loss control additive, a bridging agent, and an orthoester composition; using the well drill-in and servicing fluid to drill a well bore in a subterranean formation; allowing the well drill-in and servicing fluid to establish a filter cake in at least a portion of the well bore; contacting at least a portion of the filter cake with a breaker fluid comprising an orthoester composition; and allowing at least a portion of the filter cake to degrade.

 
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< S-S'-bis-(.alpha., .alpha.'-Disubstituted-.alpha.''-acetic acid)--trithiocarbonates and derivatives as initiator--chain transfer agent--terminator for controlled radical polymerizations and the process for making the same

> Composite semipermeable membrane, production process thereof, and element, fluid separation equipment and method for water treatment using the same

> Nonaqueous liquid electrolyte
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