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AssigneesChina Petroleum & Chemical Corporation, Dalian Research Institute of Petroleum and Petrochemicals, Sinopec Corp.
InventorsLi Fu, Jiaohe Guo, Hanrong Yao, Shuhua Liu, Jianfeng Zhang
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Modified asphalt particles contain asphalt and a modifier. The modifier comprises poly-sulfur and free sulfur. The sulfur element accounts for 10-40 weight percent of the total amount of the modified asphalt particles, and the poly-sulfur accounts for 30-70 weight percent of the total amount of the sulfur element. The total particle size of the modified asphalt particle is smaller than or equal to 150 μm. The modified asphalt particles have an excellent high temperature performance, and can be used for preparing drilling fluids. Water-in-oil based drilling fluid obtained from the modified asphalt particles has low plastic viscosity, high dynamic shear force, high dynamic plastic ratio, and high emulsion-breaking voltage, and improves the high temperature resistance and cutting carrying capability of a system.
A modified asphalt particle comprising asphalt and a modifier that contains poly-sulfur and free sulfur, wherein a total weight of the poly-sulfur and the free sulfur accounts for 10-40 wt % of a total weight of the modified asphalt particle, and the poly-sulfur accounts for 30-70 wt % of the total weight of the poly-sulfur and the free sulfur, wherein the modified asphalt particle has a particle size of less than or equal to 150 μm, and comprises a core and a shell covering the core, wherein the core has a particle size of 50-120 μm, and the shell has a thickness of 5-50 μm.
Dependencies are inferred from the claim text.