钻井液六速在线测量系统试验研究

Experimental study on a six-speed online measurement system for drilling fluid rheology

摘要:

针对传统人工测量钻井液流变参数实时性差、精度不足的问题，本文研制了一套钻井液六速在线测量系统。结合同心圆筒流动模型推导了剪切速率，并引入宾汉模型、幂律模型以及赫歇尔-巴尔克利流变模型求解流变参数。通过CFD数值模拟分析端部效应，并提出了相应的动态修正方案；搭建实验平台，对比了在线模块与标准Fann 35黏度计的测量结果。试验结果表明：该系统与台式黏度计测得结果高度一致，二者读数平均偏差小于5%；HB模型拟合误差低于2%，显著优于宾汉模型；降温会使塑性黏度与屈服应力增大，经补偿后可实现数据标准化；系统对转速阶跃变化的响应时间约2 s，动态特性优良。该系统实现了流变参数的实时、连续、高精度测量，为钻井液性能的智能化监控与安全高效钻井提供了有效技术支撑。

Abstract:

To address the issues of poor real-time performance and insufficient accuracy in traditional manual measurement of drilling fluid rheological parameters， this study developed a six-speed online drilling fluid measurement system. By deriving the shear rate based on the concentric cylinder flow model， parameter solutions were achieved by incorporating the Bingham model， power-law model， and Herschel-Bulkley rheological model. The end effect was analyzed through CFD numerical simulation， and a corresponding dynamic correction method was proposed. An experimental platform was established to compare the measurement results of the online module with those of a standard Fann 35 viscometer. The test results show that the system exhibits high consistency with the benchtop viscometer， with an average deviation of less than 5% between the readings. The fitting error of the HB model is below 2%， significantly outperforming the Bingham model. Temperature reduction markedly increases plastic viscosity and yield stress， enabling data standardization through temperature compensation. The system responds to step changes in rotational speed within approximately 2 s， demonstrating excellent dynamic performance. This system enables real-time， continuous， and high-precision measurement of rheological parameters， providing effective technical support for intelligent monitoring of drilling fluid performance and safe， efficient drilling operations.