石油钻采工艺2016，Vol.38Issue(3)：296-301,6.DOI:10.13639/j.odpt.2016.03.004
顺北含辉绿岩超深井井身结构优化设计
Casing program optimization of ultra-deep well with diabase reservoir in Shunbei block
摘要
Abstract
The six-section casing program is adopted in the Shunbei block, but it is disadvantageous with long large-size borehole, excessive casing sections and mud loss in igneous rocks, which lead to low-efifcient drilling. Therefore, it is necessary to optimize the casing program. In this paper, three reservoir pressures were simulated by using the DrillworksSoftware. The distribution of fractures in igneous rocks was identiifed by using the image logging and SEM (scanning electron microscope). The collapse mechanisms of deep shale were investigated on the basis of its mineral composition and physical and chemical properties. The matching between non-standard casings and drilling pipes was analyzed in terms of their strength and size. It is shown that there are four pressure systems in hole. The fractures distributed vertically in igneous rocks are 0.5~2 mm wide and the microfractures are 2~3 μm wide. The illite/smectite formation accounts for 70% of caving mudstones and its linear expansion ratio in distilled water is 40%~45%. Three plugging points and one risk point were deifned. The long open-hole section was stabilized by taking mud loss remedial measures with potassium ammonium polysuifde drilling lfuid system. The Ø139.7 mm non-standard casing was selected and the completion hole diameter was enlarged to 120.65 mm from 114.3 mm, so that the Ø88.9 mm non-standard drilling pipe could be used and the casing program was optimized into four-section mode. By virtue of the new casing program, the drilling was performed efifciently, with the drilling cycle shortened by 125 d.关键词
超深井/火成岩/长裸眼/井身结构/套管优选/承压堵漏技术Key words
ultra-deep well/igneous rock/long open-hole/casing program/casing selection/mud loss control under pressure分类
能源科技引用本文复制引用
刘彪,潘丽娟,易浩,李双贵..顺北含辉绿岩超深井井身结构优化设计[J].石油钻采工艺,2016,38(3):296-301,6.基金项目
国家科技重大专项“大型油气田及煤层气开发”之课题“碳酸盐岩缝洞型油藏钻井技术完善与推广”（编号2011ZX05049-02-02）。 （）
