Geosteering technology based on geological and engineering integration for horizontal wells in Zhaotong National Shale Gas Demonstration Zone

doi:10.3969/j.issn.1672-7703.2019.02.011

Abstract

Abstract: Compared with the shale gas fields in North America and the Sichuan Basin, the Zhaotong National Shale Gas Demonstration Zone is characterized by micro-relief structures with developed fractures, poor stress conditions and narrow target reservoir window. In this zone, it is hard to control the trajectory of a horizontal well and develop efficiently. Considering geological and engineering factors, a model was proposed for increasing ROP and production efficiency by controlling trajectory at low cost. The model emphasizes geological optimization in pre-drilling, drilling and post-drilling analysis to understand the distribution law of high-quality shale reservoirs and technical designing. It ensures the precision in landing and tracking horizontal section by integrating techniques including element mud logging + gamma ray control while drilling, point-by-point seismic guidance, ant tracking + apparent polarity attributes, and geosteering tools. It ensures drill-in rate and smooth trajectory, improves drilling quality and lays a solid foundation for high gas production. The proposed geosteering technology has been successfully applied in field.

Key words: mountain shale gas, geology-engineering integration, well trajectory, drill-in rate, wellbore integrity

CLC Number:

Liang Xing, Xu Jinbin, Liu Cheng, Jiao Yajun, Shu Honglin, Chen Anhuan, Bian Weikun, Tao Xiaofeng. Geosteering technology based on geological and engineering integration for horizontal wells in Zhaotong National Shale Gas Demonstration Zone[J]. China Petroleum Exploration, 2019, 24(2): 226-232.

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