石油钻采工艺2023，Vol.45Issue(4)：418-423,6.DOI:10.13639/j.odpt.202205053
双层连续管双梯度钻井井筒钻井液当量循环密度分布特征
Well ECD distribution characteristics during dual-layer coiled tubing dual-gradient drilling
摘要
Abstract
Dual-layer coiled tubing drilling is a novel dual-gradient drilling technique.In order to analyze the ECD distribution characteristics in the well during dual-layer coiled tubing drilling,a computational model for calculating well ECD based on the characteristics of dual-layer coiled tubing drilling technology was developed,taking into account parameters such as well temperature,pressure and cuttings concentration.The impacts of drilling fluid displacement and density on well ECD were analyzed.The case study indicate that the well ECD increases with the increase of drilling fluid displacement and density,while slightly influenced by the increase of penetration rate.And the dimensions of the dual-layer coiled tubing need to be optimized based on the well size and circulating pressure loss.The dual-layer coiled tubing dual-gradient drilling technique can effectively reduce the bottomhole ECD,and achieve dynamic control of well pressure by adjusting drilling fluid displacement and density during drilling,providing an effective solution for addressing challenges such as narrow pressure windows in deepwater drilling and shallow leakage.关键词
双层连续管/双梯度钻井/深水/井筒压力/ECDKey words
dual-layer coiled tubing/dual-gradient drilling/deep water/well pressure/ECD分类
能源科技引用本文复制引用
郝希宁,何玉发,程兵,张更,李军..双层连续管双梯度钻井井筒钻井液当量循环密度分布特征[J].石油钻采工艺,2023,45(4):418-423,6.基金项目
国家重点研发计划项目"双层连续管双梯度钻井工艺及应用研究"(编号2018YFC0310205). （编号2018YFC0310205）
