muds spacer fluids chemical pills completion fluids or combinations thereof as such the elastic hollow particles 100 may be present in a fluid composition at a concentration ranging from about 70 vol to about 25 vol alternatively from about 25 vol to about 1 vol the wellbore composition may include additional fluids and additives commonly used in existing wellbore treatment fluids in particular the wellbore composition may comprise an aqueous based fluid or a nonaqueous based fluid without limitation examples of suitable aqueous based fluids include fresh water salt water e g water containing one or more salts dissolved therein brine e g saturated salt water seawater water based drilling fluids e g water based drilling fluid comprising additives such as clay additives and combinations thereof examples of suitable nonaqueous based fluids include without limitation diesel crude oil kerosene aromatic mineral oils non aromatic mineral oils linear alpha olefins poly alpha olefins internal or isomerized olefins linear alpha benzene esters ethers linear paraffins or combinations thereof for instance the non aqueous based fluids may be blends such as internal olefin and ester blends in some embodiments the additional fluids and or additives may be present in the wellbore composition in an amount sufficient to form a pumpable wellbore fluid the elastic hollow particles 100 may be placed in a subterranean annulus in any suitable fashion for example the elastic hollow particles 100 may be placed into the annulus directly from the surface alternatively the elastic hollow particles 100 may be flowed into a wellbore as part of a wellbore composition via the casing and permitted to circulate into place in the annulus between the casing and the subterranean formation generally an operator will circulate one or more additional fluids e g a cement composition.