Research Progresses of Hydraulics for Extended Reach Drilling in China Part II: Hole cleaning monitoring and Hydraulic extended limit

摘要

The extended reach drilling (ERD) is being adopted widely in China. But it also brought a series of technical difficulties because of its own characteristics. Some progresses were made after several years of hard work in China about Hydraulics for ERD. In the paper of "Research Progresses and Perspectives of Hydraulics for Extended Reach Drilling in China, Part I", the author demenstrated part of these progresses including cuttings transport model and precise model of pressure loss calculation. In this paper, the part of rest were presented which inlcuding hydraulic extended limit calculation model and analysis and hole cleaning monitoring method for ERD. Based on the above studies, the author finally developed a system of hole cleaning monitoring and hydraulics design and its risk analysis which could provide theoretical support and useful tool for engineering design and risk analysis before drilling. These researches are helpful to ERD and have enriched the hydraulic theory of ERD.