中国石油勘探 ›› 2019, Vol. 24 ›› Issue (2): 226-232.DOI: 10.3969/j.issn.1672-7703.2019.02.011

• 工程技术 • 上一篇    下一篇

昭通国家级页岩气示范区水平井地质工程一体化导向技术应用

梁兴, 徐进宾, 刘成, 焦亚军, 舒红林, 陈安环, 卞维坤, 陶晓峰   

  1. 中国石油浙江油田公司
  • 收稿日期:2018-09-19 修回日期:2019-03-04 出版日期:2019-03-15 发布日期:2019-03-15
  • 基金资助:
    国家科技重大专项“昭通页岩气勘探开发示范工程”(2017ZX05063)。

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

Liang Xing, Xu Jinbin, Liu Cheng, Jiao Yajun, Shu Honglin, Chen Anhuan, Bian Weikun, Tao Xiaofeng   

  1. PetroChina Zhejiang Oilfield Company
  • Received:2018-09-19 Revised:2019-03-04 Online:2019-03-15 Published:2019-03-15
  • Supported by:
     

摘要: 与成功进行页岩气开发的北美地区及四川盆地内勘探开发区块不同,昭通国家级页岩气示范区具有微幅度构造及裂缝发育、应力条件差、箱体厚度薄等特点,水平井钻井中轨迹控制难度大,页岩气高效开发难度高。综合地质工程因素,统筹考虑,进行轨迹优化控制,以经济效益为前提建立钻井提速提效模式。其核心在于通过钻前分析、钻中优化、钻后评价,不断探索优质页岩储层空间展布规律、优选技术方案,采用元素录井+随钻伽马控制技术、地震逐点引导技术、蚂蚁体+视极性工程预警技术和导向工具优化组合,实现箱体的准确着陆及水平段的精准穿行,有效保障了水平段优质储层钻遇率和轨迹平滑,钻井品质不断提升,为实现单井高产打下坚实基础,地质工程一体化导向技术现场应用效果显著。

 

关键词: 山地页岩气, 地质工程一体化, 井眼轨迹, 钻遇率, 井筒完整性

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

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