is calculated; and D, the leakage of the drilling fluid is calculated according to a formula, a drilling fluid leakage model is obtained though the following method that the drilling fluid mass conservation equation, the leakage momentum equation, the rheological equation of a fluid and the tortuosity equation are solved simultaneously to obtain a formula (18) anda formula (23), the formula (18) is the relationship between the differential pressure and the leakage radius, and the formula (23) is the total leakage relationship of the drilling fluid. According to the drilling fluid leakage prediction method for the fissured formation, the leakage of the drilling fluid of the fissured formation can be predicted, so that a field engineer adopts a reasonable and efficient leakage stopping technology in time according to the loss condition of the formation, solves the drilling risk in time, and reduces the loss of the drilling fluid.
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