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Main technical innovations of songke Well No.2 Drilling Project

China Geology 2018年第2期1卷 187-201页

作者： Yong-yi Zhu Wen-shi Wang Xiao-ming Wu Heng-chun Zhang Jie Xu Jia Yan Long-long Cao Heng-qian Ran Jin-chang Zhang Instttute of Exploration Techniques China Geological SurveyLangfang 065000China China University of Geosciences (Wuhan) Wuhan 430074China

songke Well No.2,one of the main part of the scientific drilling project in Songliao Basin,which was drilled 7018 m and acquired the part of cores continuously from the Low Cretaceous to the Carboniferous and the Permian from the 2843 m deep,can be considered as the deepest continental drilling project in *** at the features of longer well sections,larger diameters and multiple spud-ins for coring of songke Well No.2,this project broke through the "coring in small diameter and reaming in large diameter"spud-in drilling-completion procedures which are always used in large-diameter-well coring for continental scientific drilling projects in domestic and overseas and the drilling method of short-singlecylinder roundtrip *** the same time,"coring in the same diameter and completing drilling at one single diameter"was achieved at all φ311 mm and φ216 mm coring sections of more than one thousand meters long,high-efficient operation with "drilling long footage with drill tools combined in multicylinders"was achieved at deep coring *** world drilling records were created which include more than a thousand meters continuous coring at φ311 mm,and the footage per roundtrip footage at φ311 mm,φ216 mm and φ152 mm is all more than 30 m,all of these breakthroughs reduced at least 300 days for this project;moreover,considering the characteristics of formations that the geothermal gradient is high in the drilled sections and the inside-well temperature is over 240℃ after drilling completion,a formate-polymer water-based mud system was developed by compounding attapulgite and sodium bentonite and by adding independently developed high-temperature stabilizer,which can provide critical technical support for successful well completion at 7018 m in the super-high-temperature environment It is the first time that the water-based mud is operated at the working temperature higher than 240℃ in China;Besides,considering the high-quality requirement on cores imposed by

关键词： songke Well No.2 Long drilling process Large diameter Super-high-temperature water-based mud Nondastruetive core diseharge

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