摘要
伊朗雅达油田地质条件复杂，为碳酸盐岩储层，具有高温、高压及多压力系统，并含有高浓度硫化氢及二氧化碳酸性气体。在2001到2003年间施工了5口探井，井深4 500~5 000 m，普遍钻井存在着机械钻速低、井漏、压差卡钻、高压沥青层侵入等突出问题，钻井周期长，安全快速钻井面临巨大的挑战。文中分析了雅达油田钻完井存在的难点以及优快钻井技术应用方案，包括灰岩地层压力检测技术、非渗透防卡钻井液技术、高效破岩及优选钻井参数、高压沥青层钻井技术为特色的雅达油田安全快速成井配套技术等，这些成果在雅达油田一期的井身结构、钻头选型、钻井提速和钻井液等方面进行了全面应用，平均机械钻速较前期提高40%以上，取得了显著的效益。
Abstract
Yadavaran Oilfield of Iran has complex geologic conditions; it is a carbonate reservoir with high temperature and high pressure and multiple pressure systems, and contains acidic gases like high concentrations of hydrogen sulfide, carbon dioxide, etc. Five exploration wells with depths of 4 500-5 000 m were drilled from 2001 to 2003, which all experienced outstanding issues of low rate of penetration, mud loss, differential sticking, heavy oil influx, etc. These wells were drilled with long drilling period, and so safe and fast drilling faced great challenge. This paper has analyzed the difficulties in drilling and completion operations and the application scheme of optimized fast drilling technology in the field, including pressure detection technique in limestone formation, non-permeate anti-sticking drilling fluid technology, highly efficient rock breaking and parameters optimization, heavy oil layer drilling technology, etc. These solutions were fully utilized in casing program, bit selection, rate of penetration improvement and drilling fluids, etc., and have achieved remarkable economic benefit with average rate of penetration up by over 40%.
论文详情