Patent ID: 7284611

Claim:
A method of controlling lost circulation comprising contacting a lost circulation zone in a subterranean formation with a lost circulation composition having at least a trimodal particle size distribution, the lost circulation composition comprising: a first portion of particles having a weight mean particle size of less than about 20 microns; a second portion of particles having a weight mean particle size in the range of from about 25 microns to about 400 microns; and a third portion of particles having a weight mean particle size in the range of from about 450 microns to about 1,500 microns; wherein resilient particles, particles comprising a thermoset polymer laminate, or a combination thereof are present in the lost circulation composition in an amount of at least about 20% by weight of the lost circulation composition; and wherein the first portion of particles fills at least a plurality of interstices between at least one of the second and third portion of particles, and wherein the second portion of particles fills at least a plurality of interstices between the third portion of particles.