页岩水平井分段多簇缝口暂堵参数优化——以川南下寒武统筇竹寺组页岩为例

Optimization of Dynamic Fracture Plugging Parameters in Lower Cambrian Qiongzhusi Shale, Southern Sichuan Basin

李永明 马健 栗铁峰 孙鹏

LI Yongming MA Jian LI Tiefeng SUN Peng

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

Petroleum Engineering Technology Research Institute, Southwest Petroleum Branch, SINOPEC, Deyang, Sichuan 618000, China

水平井分段多簇压裂是页岩气储层勘探开发的关键技术，为保障多簇裂缝均匀扩展，工程上采用暂堵球封堵优势裂缝缝口的工艺，但目前主要依靠经验，封堵效果差异较大。为提高缝口封堵效率，基于可视化井筒暂堵实验装置模拟分析暂堵球在水平井中的运移坐封过程，认识提高缝口封堵效率的影响规律；在此基础上，考虑携砂液对孔眼动态磨蚀扩大孔径，基于范宁方程、流动摩阻和压裂过程，建立了携砂液磨蚀后孔眼直径模型，优化了缝口动态封堵参数。结果表明，当暂堵球直径为磨蚀后孔眼直径的1.03倍、暂堵球数量是孔眼开启数量的1.1~1.3倍时，磨蚀后孔眼坐封效率最高。在筇竹寺页岩JY3井应用封堵效率显著提高，暂堵后各段压力均有明显涨幅，为类似页岩油气水平井分段多簇缝口暂堵工艺优化提供了理论方法。

Horizontal well staged multi-cluster fracturing is a key technology in the exploration and development of shale gas reservoir. In order to ensure the uniform expansion of multi-cluster fractures, temporary plugging ball is used to seal the advantageous fractures. In order to improve the sealing efficiency, we simulates and analyzes the migration and sealing process of temporary plugging balls in horizontal wells based on a visual wellbore temporary plugging experimental device, to understand the impact of improving the efficiency of seam sealing. Based on the Fannin equation, flow friction and fracturing process, the hole diameter model was established and the dynamic sealing parameters were optimized. The results show that when the diameter of temporary plugging ball is 1.03 times of the hole diameter and the number of temporary plugging ball is 1.1~1.3 times of the opening number of the hole, the setting efficiency of the hole after abrasion is the highest. The plugging efficiency of Well Jinye 3 in Qiongzhusi Shale was significantly improved, and the pressure of each section increased significantly after the temporary plugging, which provided a theoretical method for the optimization of the multi-cluster fracture plugging process of similar shale oil and gas horizontal wells.

10.11885/j.issn.1674 5086.2024.12.12.01