钻井液与完井液2025，Vol.42Issue(3)：302-307,6.DOI:10.12358/j.issn.1001-5620.2025.03.004
钻井液可降解携岩剂的研制及在万米深井中的试验
Preparation of a Drilling Fluid Degradable Cuttings Carrying Agent and Its Test in 10,000-Meter Deep Wells
摘要
Abstract
In highly deviated wells,horizontal wells or large diameter wells,drilled cuttings are likely to accumulate on the lower side or at the bottom of the well due to insufficient cuttings carrying capacity of the drilling fluid.This will lead to complex downhole situations such as an increase in the friction of the drill string movement,difficulties in tripping,downhole lost circulation and even pipe sticking.Hole cleaning is therefore one of the key technologies to achieve operation safety and efficiency in highly deviated wells,horizontal wells or large diameter wells.A fiber cuttings-carrying agent that can significantly improve the cuttings carrying capacity of a drilling fluid was developed by blending and reacting an aliphatic polyester polymer with a high molecular weight copolymer.Results of performance evaluation experiments show that in the experimental slurry with 0.2%of the cuttings-carrying agent,the settling time of the cuttings increases from the original 4.12 sec to 19.85 sec.This cuttings-carrying agent has good dispersibility in both aqueous phase and oil phase.After hot rolling at 120℃for 16 h,the degradation rates in clean water and white oil are 95.48%and 89.87%respectively,and the degradation does not affect the performance of the drilling fluid.Field tests show that this cuttings-carrying technology can significantly improve the cuttings-carrying capacity of the drilling fluid,effectively carry drilled cuttings or sloughing rock pieces out of large diameter wells or horizontal well sections,improve the wellbore cleanliness,and provide a guarantee for safe and efficient drilling.关键词
钻井液/携岩剂/井眼清洁/可降解Key words
Drilling fluid/Cuttings carrying agent/Hole cleaning/Degradable分类
能源科技引用本文复制引用
明显森..钻井液可降解携岩剂的研制及在万米深井中的试验[J].钻井液与完井液,2025,42(3):302-307,6.基金项目
川庆钻探工程公司科研项目"万米特深井钻井液关键技术研究"(CQ2023B-57-2-3)和"低成本高效可降解携砂剂研发"(CQ2022B-18-4-3). （CQ2023B-57-2-3）
