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Improving drilling hydraulics estimations-a case study
Journal of Petroleum Exploration and Production Technology ( IF 2.2 ) Pub Date : 2021-06-17 , DOI: 10.1007/s13202-021-01203-4
Rahman Ashena , Abdol-Azim Hekmatinia , Ali Ghalambor , Bernt Aadnoy , Charissa Enget , Vamegh Rasouli

Accurate pressure drop estimation is important for drill string and bit nozzles design and optimized fluid circulations as well as identifying the drilling problems such as bit nozzle(s) washout or plugging. In this study, the Bingham Plastic model has been modified by applying a coefficient to its turbulent pressure loss calculations. This coefficient encompasses the effects of the drill pipe tool joints and other effects in estimation of pressure losses. The range of the coefficient was determined in field applications for different hole sizes and mud types. The results showed that applying a correction coefficient of 1.08–1.12 to turbulent pressure loss equations (depending on borehole size and mud type) improves the pressure loss estimation. By applying this coefficient, the estimated pressure losses are increased to compensate the under-estimation of the Bingham Plastic model. This is considered a significant contribution to accurate calculation of borehole hydraulics and in-time detection and identification of borehole problems and reduction of invisible lost time. The findings also showed that this enhanced effect is independent of the mud type. The use of this coefficient removes the necessity of using rather complex mud rheological models such as the Herschel–Bulkley model.



中文翻译:

改进钻井水力学估计——案例研究

准确的压降估计对于钻柱和钻头喷嘴的设计和优化流体循环以及识别钻头喷嘴冲洗或堵塞等钻井问题非常重要。在本研究中,宾汉塑料模型已通过将系数应用于其湍流压力损失计算进行了修改。该系数包括钻杆工具接头的影响和其他对压力损失估计的影响。该系数的范围是在现场应用中针对不同孔径和泥浆类型确定的。结果表明,将 1.08-1.12 的修正系数应用于湍流压力损失方程(取决于钻孔尺寸和泥浆类型)可以改进压力损失估计。通过应用这个系数,增加估计的压力损失以补偿 Bingham 塑性模型的低估。这被认为是对精确计算钻孔水力学和及时检测和识别钻孔问题以及减少无形损失时间的重要贡献。研究结果还表明,这种增强效果与泥浆类型无关。使用该系数消除了使用相当复杂的泥浆流变模型(例如 Herschel-Bulkley 模型)的必要性。

更新日期:2021-06-18
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