四川盆地页岩油水平井“测定导”一体化技术应用

doi:10.3969/j.issn.1002-302x.2022.02.010

摘要/Abstract

摘要： 四川盆地侏罗系页岩油气埋藏浅、保存条件好、地层压力系数高、发育层系多，具备立体勘探优势。大安寨段和凉高山组主要为特低孔隙度、特低渗透率致密储层，常规手段难以实现经济有效开发。为了提高页岩油优质储层钻遇率，有效降低施工风险，开展了“测定导”一体化技术创新与实践。以LA1导眼井岩心、岩屑资料为基础，综合分析四川盆地中部大安寨段页岩储层中矿物组分含量及孔隙度、TOC、渗透率等物性参数，确定页岩油水平井地质与工程甜点。通过井震结合、精细地质建模，探索优质页岩储层展布规律，优选水平井目标箱体，优化随钻地质导向工具及钻具组合方案。利用水平井轨迹优化设计与控制技术，结合地质模型与随钻自然伽马数据，动态实时跟踪与钻井轨迹调整，页岩油水平井优质井身质量和箱体钻遇率获得有效提高，并为压裂分段分簇奠定良好基础。技术应用后，四川盆地大安寨段页岩突破了出油关。

关键词: 页岩油, 四川盆地, 水平井, “测定导”一体化, 随钻仪器, 钻具组合, 地质导向

Abstract: The Jurassic shale oil and gas reservoirs in Sichuan Basin are favorable for stereo exploration owing to their shallow buried depth, good preservation conditions, high formation pressure coefficient and development of multiple layers. It is difficult to use the conventional methods to bring the tight reservoirs in Da’anzhai Member and Lianggaoshan Formation under economic and effective development because of their ultra-low porosity and ultra-low permeability. The innovative “logging-directional drilling-geosteering” integration technology was practiced to improve the drilling success rate of high-quality shale oil reservoirs and lower the operational risks. Based on the core and cuttings data of the LA1 pilot well and analyzing the physical parameters of Da’anzhai Member shale reservoirs in the central Sichuan Basin, such as content of mineral components, porosity, TOC and permeability, the geological and engineering sweet point was determined. Combined with the well logging and seismic data, fine geological modeling, the efforts were made for studying the distribution law of high-quality shale reservoirs, optimizing the target box of horizontal well and optimizing the geosteering tools and drilling tools assembly plan. The horizontal well trajectory optimization design and control technology, combined with geological model and natural gamma data while drilling, was used for dynamic real-time tracing and drilling trajectory adjustment, thus effectively improving the wellbore quality of a horizontal well and the success rate of drilling into the box and laying a good foundation for segmentation and clustering fracturing. Application of the technology helped produce oil from Da’anzhai Member shale reservoir in Sichuan Basin.

中图分类号:

TE243

柏爱川　吉人　张宇　赵占钊　侯玉文　刘雨烟　丁海琨. 四川盆地页岩油水平井“测定导”一体化技术应用[J]. 石油科技论坛, 2022, 41(2): 74-84.

Bai Aichuan, Ji Ren, Zhang Yu, Zhao Zhanzhao, Hou Yuwen, Liu Yuyan, Ding Haikun. Application of “Logging-Directional Drilling-Geosteering” Integration Technology for Shale Oil Horizontal Wells in Sichuan Basin[J]. Petroleum Science and Technology Forum, 2022, 41(2): 74-84.

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