Difficulties and optimization of wire-line core drilling technology for broken formation in complex structure area of northwest Hunan

Authors

KONG Xiangwang, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, ChinaFollow
ZHANG Shaohe, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
WANG Wenbin, The Coal Geological Exploration Institute of Hunan Province, Changsha 410014, China; Hunan Geological New Energy Exploration and Development Engineering Technology Research Center, Changsha 410014, China
SUN Pinghe, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
WU Dongyu, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
XIAO Jincheng, The Coal Geological Exploration Institute of Hunan Province, Changsha 410014, China; Hunan Geological New Energy Exploration and Development Engineering Technology Research Center, Changsha 410014, China
HE Hongsheng, The Coal Geological Exploration Institute of Hunan Province, Changsha 410014, China; Hunan Geological New Energy Exploration and Development Engineering Technology Research Center, Changsha 410014, China

Abstract

Taking Xiangcidi 1 Well in the complex structural area of northwest Hunan as an example, in view of the common drilling difficulties encountered during the drilling process such as low core adoption rate and stuck-drilling buried drilling, we adopted the self-developed pumpless reverse circulation advanced side spray line and optimized the drilling fluid system to effectively improve the core drilling rate of the drilling project. The new type of drilling tool can form a local reverse circulation at the bottom of the hole, and combined with the internal anti-clogging cone net of the drilling tool and the design of the advanced side jet bit can effectively improve the drilling core rate in broken formations. By applying the drilling tool in practice, the drilling core rate in the core broken formation reached 94.4%, so it has achieved good application effects.

Keywords

complex structure area, broken formation, drilling core rate, wire-line core drilling tool, advanced lateral jet

DOI

10.3969/j.issn.1001-1986.2021.02.031

Recommended Citation

KONG Xiangwang, ZHANG Shaohe, WANG Wenbin, et al. (2021) "Difficulties and optimization of wire-line core drilling technology for broken formation in complex structure area of northwest Hunan," Coal Geology & Exploration: Vol. 49: Iss. 2, Article 32.
DOI: 10.3969/j.issn.1001-1986.2021.02.031
Available at: https://cge.researchcommons.org/journal/vol49/iss2/32

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