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中文摘要：
针对日光油田Cardium组致密油开发需要大量高效低成本的水平井钻井和多段压裂等特点,研究并应用了致密油大位移水平井钻井技术.考虑大位移水平井复合钻井的特殊要求,建立了三段组合圆弧井眼轨道模型,深入研究了井身结构、油基钻井液、钻头优化和钻具组合等关键技术.对3口先导试验大位移水平井丛式井组和3口相邻水平井丛式井组的经济效益进行了评价,评价结果表明,其平均每米水平段长度的钻完井费用比相邻丛式井组节约22％、钻井周期比相邻丛式井组减少42％,其初始平均日产量和6个月总产量分别是相邻丛式井组的1.6倍和1.7倍,达到了先导试验的目的.得到的研究成果对同类地层致密油的勘探开发具有借鉴意义.
英文摘要：
Since the tight oil development in Cardium formation, Daylight oilfield presents the need of a large number of low-cost and efficient horizontal drilling and multi-stage fracturing, the extended reach horizontal drilling technologies for tight oil are studied and applied. Considering the special requirements of the extended reach hori- zontal well composite drilling, the three-section wellbore trajectory model is established and in-depth studies have been conducted on the key technologies like wellbore configuration, oil-based drilling fluids, drill bit optimization and bottomhole assembly. The economic benefits of the clustered three pilot extended reach horizontal wells and oth- er clustered three offset horizontal wells are evaluated. The evaluation results show that, comparing to the offset well cluster, the pilot clustered extended reach horizontal wells have reduced the average cost per meter of drilling by 22% and have saved 42% drilling time with 1.6 times average daily output and 1.7 times total output in the first six month, thus reaching the purpose of the pilot test.
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