The flow of mud is closely related with the anomaly of well-bore diameter, the density of cuttings in the mud and the annular pressure loss. This paper discusses the annular flow effect, puts forward the three flow effect criteria of erosion, lifting and dynamic pressure, defines the similitude rule of annular effect, and derives formulas representing the three criteria. It also recommends the index for evaluating the annular effects, and presents how to select the rheological parameters and the circulation rate.

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