Improved lost circulation compositions that include melt-processed
inorganic fibers and methods for using such compositions in subterranean
formations are provided. An example of a method of the present invention
is a method of cementing in a subterranean formation. Another example of
a method of the present invention is a method comprising providing a
cement composition that comprises cement, water, and a plurality of
melt-processed inorganic fibers, the melt-processed inorganic fibers
having a mean aspect ratio of greater than about 25, a specific gravity
of greater than about 1.2, and a length of less than about 10
millimeters; introducing the cement composition into a well bore that
penetrates a subterranean formation; and allowing the melt-processed
inorganic fibers to at least partially prevent fluid loss from the cement
composition into the subterranean formation. An example of a composition
of the present invention is a cement composition for use in a
subterranean formation.