MUMBAI, Feb. 7 -- As is well known in the oil industry, one of the most common reasons for drilling tools breaking down is failure of rubber polymer. Orient Energy & Technology Ltd., a leading producer of oil industry equipment in China, has found that graphene nanotubes improve abrasion resistance of the rubber stator by 20% and increase tensile modulus by 30%, resulting in a shortened drilling cycle, reduced energy consumption and less environmental pollution from the drilling equipment. 56% of drilling tool failures in the oil extraction industry are caused by low durability of the rubber stator - one of the most important elements in a screw drill. In China, annual losses from the failure of drilling tools are estimated to be more than ...