四川盆地威荣深层页岩气安全与提速钻井技术

Safety and accelerated drilling technologies for deep shale gas in Weirong of Sichuan Basin

何新星 严焱诚 朱礼平 王希勇 朱化蜀 王治国

HE Xinxing YAN Yancheng ZHU Liping WANG Xiyong ZHU Huashu WANG Zhiguo

1. 中国石化 西南油气分公司 石油工程技术研究院, 四川 德阳 618000; 2. 中国石化 西南油气分公司 非常规油气勘探开发管理部, 重庆 永川 402160; 3. 中国石化 西南油气分公司 页岩气项目部, 重庆 永川 402160

1. Petroleum Engineering Technology Research Institute, SINOPEC Southwest Oil and Gas Company, Deyang, Sichuan 618000, China; 2. Unconventional Oil and Gas Exploration and Development Management Department, SINOPEC Southwest Oil and Gas Company, Chongqing 402160, China; 3. Shale Gas Project Department, SINOPEC Southwest Oil and Gas Company, Chongqing 402160, China

四川盆地威荣页岩气埋深3 600～3 850 m，属于典型的深层页岩气藏，钻井工程面临压力体系复杂、茅口组部分区域断溶体发育、地层可钻性差、龙马溪组地层温度高等难题。针对复杂的地质条件，以安全与提速钻井为核心，通过成熟引进与先导试验技术结合的方式，持续攻关钻井工程工艺技术；并不断深化过路层段地质认识，采用一段一策的方案，提高工程技术的针对性。威荣页岩气田经历勘探评价、开发一期、开发二期3个阶段，形成了以井身结构优化、断溶体避让的轨道设计、井筒压力控制和钻压同步预防压窜干扰为重点的安全钻井技术，以“二维+小三维”的三维轨道剖面、四位一体地质导向技术、破岩工具优选和钻井参数强化为关键的提速钻井技术。该技术应用于威荣页岩气田150余口开发井，机械钻速由开发初期的6.32 m/h提升至9.12 m/h，钻井周期由106.68 d缩短至68.75 d，缩短率为35.56%，实现了威荣深层页岩气钻井工程提速降本的目标，其形成的安全与提速钻井系列技术对同类型气藏开发具有较强的参考意义。

The Weirong shale gas in the Sichuan Basin, buried at depths of 3 600-3 850 m, represents a prototypical deep shale gas reservoir. Drilling operations face challenges such as a complex pressure system, developed fault-dissolved bodies in certain areas of the Maokou Formation, poor drillability of formations, and high strata temperatures in the Longmaxi Formation. To address these complex geological conditions, this study focused on the safe and accelerated drilling. By combining mature technologies with pilot testing, continuous efforts were made to advance drilling engineering techniques. Through deepening the understanding of the geology of the passing strata sections, targeted solutions for each section were implemented to enhance the precision of engineering techniques. The Weirong shale gas field had gone through three stages: exploration and evaluation, development phaseⅠ, and Ⅱ. This led to the development of safe drilling technologies that emphasize optimization of well structure, track designs avoiding fault-dissolved bodies, wellbore pressure control, and synchronized drilling andfracturing to prevent interference between wells. Additionally, accelerated drilling technologies were cultivated, focusing on a “2D + small 3D” three-dimensional track profile, integrated geological guidance, optimal rock-breaking tools, and enhanced drilling parameters. Applied to over 150 well drillings in the Weirong shale gas field, these technologies increased the rate of penetration from 6.32 m/h at the start of development to 9.12 m/h, reduced the drilling cycle from 106.68 days to 68.75 days (a reduction of 35.56%), achieving the goal of acce-lerated and cost-effective deep shale gas drilling in Weirong area. These technologies provide significant reference value for the development of similar gas reservoirs.

中国石化“十条龙”科技攻关项目(P18058)资助。

https://doi.org/10.11781/sysydz202403630