Engineering plastic / inorganic fiber blends as lost circulation materials

摘要

A method for reducing lost circulation in drilling wells employs composite materials containing an engineering thermoplastic polymer and mineral fibers. Optionally the composites may also include other components such as calcium carbonate and blending agents.

主权项

1. A method for reducing lost circulation of a fluid in a subterranean formation; said method comprising contacting the subterranean formation with a mixture of the fluid and a lost circulation material; wherein the lost circulation material comprises composite particles; wherein the composite particles comprise one or more engineering thermoplastic polymers, and one or more inorganic fibers; wherein the one or more engineering thermoplastic polymers are between about ten percent and about seventy percent of the lost circulation material by mass; wherein the one or more inorganic fibers are between about ten percent and about seventy percent of the lost circulation material by mass; and wherein the engineering thermoplastic polymer is a matrix that binds together the components of the lost circulation material into composite particles.