Main technical innovations of Songke Well No.2 Drilling Project

• 作者: Heng-chun Zhang Heng-qian Ran Jia Yan Jie Xu Jin-chang Zhang Long-long Cao Wen-shi Wang Xiao-ming Wu Yong-yi Zhu
• 来源期刊: 中国地质（英文）
• 年，卷（期）: 2018,（2）
• 所属期刊栏目: Original Articles
• 页码范围: 187-201
• 页数: 15页
• 语种: 中文
• DOI: 10.31035/cg2018031

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 Asia. Aiming 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-single-cylinder roundtrip footage. At 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 multi-cylinders" was achieved at deep coring section. Four 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°C 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°C in China;Besides, considering the high-quality requirement on cores imposed by the project, the method"mechanical cored is charge" to discharge core nondestructively on the ground was worked out, and more than 4000 m scatheless cores were discharged out of the drill pipes while maintaining original stratum structures.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Yong-yi Zhu		1	0	0.0	0.0
2	Wen-shi Wang		1	0	0.0	0.0
3	Xiao-ming Wu		1	0	0.0	0.0
4	Heng-chun Zhang		1	0	0.0	0.0
5	Jie Xu		1	0	0.0	0.0
6	Jia Yan		1	0	0.0	0.0
7	Long-long Cao		1	0	0.0	0.0
8	Heng-qian Ran		1	0	0.0	0.0
9	Jin-chang Zhang		1	0	0.0	0.0