Method of providing a barrier in a fracture-containing system

A method of reducing fluid loss in formations by providing a barrier in a fracture-containing system, comprising:

• i) Providing a treatment fluid comprising:
• a) a base fluid;
• b) an elastomeric material, wherein said elastomeric material comprises at least one polymer capable of crosslinking into an elastomer, and
• c) at least one crosslinking agent;
• ii) Placing the treatment fluid in a fracture-containing system;
• iii) Allowing the elastomeric material to crosslink with itself and with the crosslinking agent to form a barrier in said fracture-containing system;
• wherein the elastomeric material and/or the crosslinking agent are of neutral buoyancy with regard to the base fluid, wherein at least one of the elastomeric material or the crosslinking agent is present in the form of particles, and
• wherein the elastomeric material comprises one or more components selected from the group consisting of natural rubber, acrylate butadiene rubbers, polyacrylate rubbers, isoprene rubbers, chloroprene rubbers, butyl rubbers, brominated or chlorinated butyl rubbers, chlorinated polyethylene, neoprene rubbers, styrene butadiene copolymer rubbers, sulphonated polyethylene, ethylene oxide copolymers, ethylene-propylene rubbers, ethylene-propylene-diene terpolymer rubbers, ethylene vinyl acetate copolymers, fluorosilicone rubber, silicone rubbers, poly 2,2,1-bicyclo heptane, alkylstyrene, crosslinked substituted vinyl acrylate copolymers and diatomaceous earth, fluoro rubbers, perfluoro rubbers, tetrafluoroethylene/propylene, polyvinyl alcohol-cyclic acid anhydride graft copolymers, isobutylene maleic anhydride, acrylic acid type polymers, vinylacetate-acrylate copolymer, polyethylene oxide polymers, polymethacrylate, and acrylic polymers.