摘要
由于钻井环境恶劣,加之天然气水合物的存在和分解,井壁失稳是含天然气水合物地层钻进时面临的主要难题之一。而影响井壁稳定的关键因素主要有含水合物地层的岩石物理和力学性质、水合物在沉积地层中的分解规律特性、钻井液的性能及其与水合物地层间的相互作用。天然气水合物分解是其中的核心因素,据此提出了防止井壁失稳的一些措施,同时认为利用试验和数值模拟对这些因素进行研究,并构建合适的井壁稳定分析数值模型和研制优质的低温防塌钻井液体系,将是解决含天然气水合物地层钻井井壁失稳的有效途径。
Wellbore collapse is one of the main challenges for drilling gas hydrate formation due to poor drilling conditions and hydrate dissociation. The main factors impacting wellbore stability include rock properties, mechanical properties, characteristics of hydrate dissociation in porous sediments and drilling fluids, the properties of drilling fluid and the interaction between drilling fluid and hydrate in the formation. The dissociation of gas hydrates is the core for wellbore stability. Therefore, some measures were proposed to prevent gas hydrates from decomposing. The experimental and numerical experiments to investigate the factors, the numerical model fit for wellbore stability analysis, and the development of the drilling fluid fit for low temperature are the effective methods to solve the wellbore collapse in gas hydrate formation.
出处
《石油钻探技术》
CAS
北大核心
2008年第3期59-61,共3页
Petroleum Drilling Techniques
基金
国家自然科学基金项目"钻井液侵入含天然气水合物地层的动力学特性及其耦合数值模拟研究"(编号:50704028)
新世纪优秀人才支持计划"海底天然气水合物井壁稳定性的理论和实验研究"(编号:NCET050663)
中国地质大学(武汉)优秀青年教师资助计划"天然气水合物地层钻井用水基钻井液性能实验研究"(编号:CUGQNL0623)联合资助
