大位移井井眼清洁计算精度提升探索及实践

Exploration and Practice on Improving the Accuracy of Borehole Cleaning Calculation for Extended Reach Wells

马志忠 孟瑄 耿立军 孙永乐 袁则名 赵秋璇

MA Zhizhong MENG Xuan GENG Lijun SUN Yongle YUAN Zeming ZHAO Qiuxuan

中海油能源发展股份有限公司工程技术分公司，天津　300452 中海石油（中国）有限公司天津分公司工程技术作业中心，天津　300452

CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China Engineering Technology Operation Center of Tianjin Branch of CNOOC (China) Ltd., Tianjin 300452, China

中海油利用e-Drilling软件进行井眼清洁实时模拟，该软件计算结果误差较大。为提高井眼清洁计算精度，开展井眼清洁计算新方法探索。通过环空岩屑颗粒悬浮所需临界流速、环空钻井液流动速度计算，将临界流速和钻井液流速进行对比，以此确定岩屑床的厚度，进而计算环空岩屑浓度及井筒ECD（当量循环密度）。利用新方法对A区域两口大位移井进行计算，并和e-Drilling软件计算结果以及实测ECD值进行对比，结果显示新方法计算精度提升明显。通过实际应用可以看出，该方法具有较高的技术价值。

CNOOC uses e-Drilling software to perform real-time simulation of wellbore cleaning, and the calculation results of this software have low accuracy. In order to improve the accuracy of borehole cleaning calculation, a new method for borehole cleaning calculation has been explored. By calculating the critical flow rate required for the suspension of cuttings in the annulus and the flow rate of the drilling fluid in the annulus, the critical flow rate and the flow rate of the drilling fluid are compared to determine the thickness of the cuttings bed, and then calculate the concentration of cuttings in the annulus and the wellbore ECD (equivalent circulating density). The new method has been used to calculate two extended reach wells in Area A. Compared with calculated results of the e-Drilling software and measured ECD values, the results show that the accuracy of calculation with the new method is improved obviously. The practice shows that this method has higher technical value.

https://doi.org/10.3969/j.issn.1008-2336.2022.04.080