Method and composition for curing lost circulation

摘要

A composition made of fibers and a material able to exhibit reverse solubility has utility for treating subterranean wells. The composition may used to cure lost circulation. The composition may be added to drilling fluids, spacer fluids or cement slurries. As the fluid temperature increases in a well, the reverse solubility material may precipitate and migrate to the fibers, causing the fibers to stick to each other and form a network, thereby forming a barrier that reduces further egress of treatment fluid from the wellbore.

主权项

1. A method for treating a subterranean well, comprising:
pumping in the well a composition made of fibers and a material able to exhibit reverse-solubility, wherein the material is at least 1% soluble in water at 20° C. and has a cloud point that is higher than 20° C. and lower than 60° C., the material comprising poly(oxy)alkylene or poly-oxazoline and mixtures thereof; and allowing the composition to form a network in a well by activating the material able to exhibit reverse solubility wherein, when activated, the material able to exhibit reverse solubility also exhibits sticking properties.