Patent ID: 9169377
Filing Date: 2015-10-27
Classification: C08K,C08L,E21B,F16J

Abstract:
1. A rotary cone bit for drilling subterranean formations comprising: a bit body having at least one leg, the leg including a journal pin; a cutter cone rotatably mounted on the leg; and an annular elastomeric seal ring located between a first sealing surface on the leg and a second sealing surface on the cutter cone that forms a dynamic rotary seal between the leg and cutter cone while the cone is rotating, wherein the seal ring is formed from a material composition comprising: in the range of from about 0.2 to 65 percent by weight of a first elastomeric fluoropolymer material based on the total weight of the composition; and in the range of from about 10 to 95 percent by weight of a second elastomeric fluoropolymer material based on the total weight of the composition, the second elastomeric fluoropolymer material comprising a polymer matrix and a dispersion of particles disposed therein, wherein the particles are formed from a fluoropolymeric material and have an average size of less than about 100 nm, wherein the composition comprises in the range of from 10 to 90 percent by weight particles based on the total weight of the second elastomeric material and particles, and wherein the first elastomeric material and the second elastomeric material are mixed together so that the particles are substantially uniformly distributed therein.