海洋超高温高压井钻井液设计与测试方法及国外钻井液新技术

Drilling fluid design and test method for offshore ultra-HTHP wells and new drilling fluid technology abroad

介绍了国外高温高压井的最新定义和分级,以及全球海上高温高压井的分布。阐述了海洋高温高压井钻井液性能设计方法,主要包括密度、高温热稳定时间、抗高温能力、高温高压滤失量、抗污染能力、低温流变性能和水合物抑制能力等,提出高温热稳定时间、抗高温能力、高温高压滤失量应为高温高压井钻井液3个关键性能设计及评价指标,建立利用极高温高压流变仪Chandler 7600模拟高温高压井钻井液静态高温热稳定时间和动态循环抗高温能力的评价方法。详细介绍了国外抗232℃超高温无铬环境友好型水基钻井液、抗220℃超高温高密度甲酸铯钻井液、抗180℃高温无黏土储层钻井液、抗260℃超高温油基钻井液、抗315℃极高温氟基逆乳化钻井液。上述技术对中国超高温乃至极高温钻井液技术的研究具有一定的借鉴意义。

This paper presents the latest deifnition and classiifcation of HTHP wells in abroad and the distribution of HTHP wells offshore in the world;sets forth the design method for drilling lfuid properties for offshore HTHP wells, mainly including density, sta-bility time under high temperature and heat, high temperature resistance, HTHP ifltrate loss, anti-contamination capacity, rheological performance at low temperature and inhibition capacity to hydrates;comes up with the idea that the stability time at high temperature and heat, resistance to high temperature and HTHP ifltrate loss should be the three key indicators for property design and evaluation of HTHP drilling lfuid;has established the evaluation method for stability time at static high temperature and heat of drilling lfuid HTHP well and dynamic resistance to high temperature through circulation simulated by ultra-HTHP rheometer Chandler 7600. This paper also provides detailed information on anti-232℃ultra-high temperature chromium-free environment-friendly water-based drilling lfuid, anti-220℃ultra-high temperature high density cesium formate drilling lfuid, anti-180℃high temperature clay-free reservoir drilling lfuid, anti-260℃ultra-high temperature oil-based drilling lfuid and anti-315℃extremely high temperature lfuorine invert emulsion drilling lfuid in abroad. The above technologies are of reference signiifcance to the research on ultra-high temperature or even extremely high temperature drilling lfuid technology in China.