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Abstract:   With the development of shale gas and unconventional gas reservoirs at home and abroad, the oil based drilling fluid has been widely used. In horizontal well drilling it is found difficult to control the rheology of the high density OBM, with problems like too high viscosity, not easy tripping, and sticking. Using dimer fatty acid and polyol as raw material of reaction, mixed with tetradecanoic acid the rheology modifier G322-MOD has been developed for oil base drilling fluid. Its performance was evaluated and compared with similar foreign products. The results show that rheology modifier G322-MOD can significantly enhance YP and LSYP of oil base drilling fluid, with little impact on gel strength. It can be used in temperatures up to 180℃ , compatible with a variety of base oil. Have been applied in Changning-Weiyuan shale gas demonstration area of and Sichuan project, and good effects obtained. It provides a technical support for the development of shale gas and other unconventional gas reservoirs with low costs.

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