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在金刚石岩心钻探中对于冲洗液量的确定，大都是以冲洗液上返流速为基本参数，用该数与环状截面积相乘求得单位时间所需冲洗液量值，作为钻进规程参数之一。而冲洗液的上返流速是由岩粉沉降速度乘上一个常数来确定的。如有的资料推荐冲洗液上返流速为岩粉颗粒自由沉降速度的1.1～1.3倍，用数学式可表示为：V_s=（1.1～1.3）V_0式中：V_s为冲洗液上返流速；V_0为岩粉颗粒在冲洗液中的自由沉降速度。而V_0值又由李丁格公式计算求得，但由于公式中的有关系数确定范围不够准确，该公式算得的数值与实际测定的数值相差较大，从而给下一步计算又带来了偏差。
Drilling in the diamond core for the determination of the amount of flushing fluid, mostly flushing fluid back flow rate as the basic parameters, the number and the annular cross-sectional area obtained by multiplying the amount of flushing fluid required per unit time as drilling parameters one. The upflow velocity of rinsing fluid is determined by the sedimentation velocity of rock powder multiplied by a constant. If any of the information recommended rinse liquid back flow rate of free settling velocity of rock powder 1.1 to 1.3 times, using mathematical formula can be expressed as: V_s = (1.1 ~ 1.3) V_0 Where: V_s rinse fluid back flow velocity; V_0 Rock powder particles in the flushing fluid free settling velocity. However, the value of V_0 is calculated by the formula of Lydinger. However, due to the inaccurate determination range of the relevant coefficient in the formula, the value calculated by the formula is greatly different from the actual measured value, which in turn brings the deviation to the next calculation.