A Modified API’s “Two-Point” Method for Rheological Calculation
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摘要: API 推荐的“两点”法求取的流变参数误差较大,导致钻完井的水力计算与现场实际相差较大。为此,基于API“两点”法求流变参数的原理,结合管壁处流体剪切速率的预测计算公式,提出了API“两点”法的精确算法。用A、B 两种不同类型的钻井液,在圆管和环空中的层流流动实验数据,对该精确算法的准确性进行验证。结果表明:用精确算法求取的流变参数计算层流压降比用API 推荐方法更加精确。例如,用精确算法求取钻井液A、B 的宾汉模式流变参数, 计算在圆管中层流压降的平均相对误差,与API“两点”法相比,分别降低17.61% 和40.19%。Abstract: The so-called API's “two-point” method for rheological calculation often produced big errors in the calculation results which are often different than the data collected in field operations. A modified calculation method is presented based on the principle of the “two-point” method, combining the calculation method for shear rate of fluid near the wall of pipes. Data of laminar flow of two drilling fluid samples, A and B, were collected in laboratory experiments and used to verify the accuracy of the modified method. The verification shows that the modified method is more accurate than the API's method in calculating pressure drop of laminar flow. For example, Bingham rheological parameters of the fluids A and B calculated with the modified method were used to calculate the pressure drops in pipe laminar flow, the calculation errors were 17.61% and 40.19% less than the errors generated by the old “twopoint” method, respectively.
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