A drilling fluid additive for blocking rock fractures induced by drilling or pre - existing drilling fluid, method of prevention or reduction of the effects of circulation lost

摘要

The additive of circulation lost to drilling fluids. An additive into a drilling fluid to blockade of rock fractures induced by drilling or pre - existing comprising polymeric beads having a peak distribution of diameter between 1000 and 200 microns and a r. Esiliu00eancia average of at least 10% recovery after compression by a load of 200 N, and use of the same.