Main technical innovations of Songke Well No.2 Drilling Project
Main technical innovations of Songke Well No.2 Drilling Project作者机构：Instttute of Exploration TechniquesChina Geological SurveyLangfang 065000China China University of Geosciences (Wuhan)Wuhan 430074China
出 版 物：《China Geology》 (中国地质（英文）)
年 卷 期：2018年第1卷第2期
页 面：187-201页
学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0908[农学-水产] 07[理学] 0710[理学-生物学] 0707[理学-海洋科学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0815[工学-水利工程] 0705[理学-地理学] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0814[工学-土木工程] 0812[工学-计算机科学与技术（可授工学、理学学位）]
主 题：Songke Well No.2 Long drilling process Large diameter Super-high-temperature water-based mud Nondastruetive core diseharge
摘 要：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 diameterspud-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 diameterwas 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 multicylinderswas 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
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