准噶尔盆地超深井钻井技术现状与发展建议

The up to Date Technologies of Ultra-Deep Well Drilling in Junggar Basin and Suggestions for Further Improvements

准噶尔盆地深层超深层已成为油气资源勘探开发的重要接替阵地,随着钻探深度增加,地质条件越来越复杂,钻井技术难度越来越大。结合准噶尔盆地超深井钻井技术进展,根据该盆地地质构造特点、压力体系分布和地层岩性特征,剖析了造成井漏、溢流、井壁坍塌、机械钻速低的主要原因,梳理了近年来在井身结构优化、控压钻井、井壁稳定和钻井提速等方面取得的技术进步,分析了准噶尔盆地39口超深井的钻井情况和存在的不足,提出了提升钻井地质环境描述能力、丰富井筒强化手段和深化高效破岩技术等发展建议,以期对准噶尔盆地超深井钻井技术发展起到推动作用。

Deep and ultra-deep oil and gas resources have become a new critical area of the exploration and development of oil and gas resources in Junggar Basin.With the increase of drilling depth,the geological conditions of the formation become more and more complex.As a result,the challenges of drilling safely and efficiently are growing.Based on the progress of deep and ultra-deep well drilling technologies in Junggar Basin,the main causes of lost circulation,kick,borehole collapse,and low rate of penetration(ROP)were analyzed,considering the characteristics of the basin geological structure,pressure system distribution,and formation lithology.Furthermore,the technical advances in casing program optimization,managed pressure drilling,wellbore stability,ROP enhancement and other aspects in recent years were summarized.Meanwhile,the drilling situation of 39 ultra-deep wells in Junggar Basin and the existing technical shortcomings were analyzed.Based on the above analysis results,some suggestions to enhance the ability to describe drilling geological environment,enrich wellbore strengthening technologies,and deepen efficient rock breaking technologies were put forward.The research results could promote the development of ultra-deep well drilling technologies in Junggar Basin.