Abstract: Drilling fluid is a typical information transmission medium in the field of oil industry. But for a long time, the lack of relevant research on the data carrying capacity of its data results in difficult to develop high performance mud pulse generator. The CFD simulation technology as a tool; to the actual oil down-hole working environment as the background, and to the depth of the parameters for variables, water-based drilling fluid data transmission capacity were systematically researched. The corresponding relationship between the mud pressure wave transport rate and the depth of the mud at 1000~6000 m depth was obtained, generic limit rate, and the variation rule of pressure wave amplitude with the increaseing depth. The results of the whole CFD experiment have great significance to the development of high speed mud pulse generator.

Key words: CFD simulation, mud pulser, drilling fluid, pressure wave transmission speed