致密砂岩水平井压裂改造工艺优化  

Optimization of Fracturing Technology for Horizontal Wells in Tight Sandstone

作　　者：曾凌翔 范雨航 张皓月 Zeng Lingxiang;Fan Yuhang;Zhang Haoyue(Downhole Service Company of CCDC,Chengdu Sichuan 610051;Sulige Project Management Department of CCDC,Chengdu Sichuan 610051)

机构地区：[1]中国石油川庆钻探工程有限公司井下作业公司,四川成都610051 [2]中国石油川庆钻探工程有限公司苏里格项目经理部,四川成都610051

出　　处：《中外能源》2025年第3期50-55,共6页Sino-Global Energy

摘　　要：针对主力产建区由Ⅰ类储层转为Ⅱ、Ⅲ类储层,且富水贫气、目标砂体连续性差等特点,为保证单井改造效果和区域效益开发,基于砂体展布、井眼轨迹、闭合应力等差异化特点,以井控砂体覆盖最大化为目标,提出一种以经济效益为出发点,深挖技术潜能的改造优化方法:依据地震解释砂体展布预测,合理优化有效水力支撑裂缝形态;结合井眼轨迹与储层品质综合评价,建立分段原则,合理优化施工参数;以储层特点为中心,根据不同区域不同应力特征,结合生产井反演数据与实验结果,合理优化支撑剂组合,建立匹配的导流能力;基于不同支撑剂类型、不同压裂阶段,实时优化压裂液性能,保证有效、精准、低成本。应用结果表明:水力裂缝形态匹配砂体展布,减少了无效压裂规模;基于储层特点优化分段,适度控制改造段数;适应于不同区域应力特点的支撑剂组合,有效提升了石英砂比例;通过压裂液性能的精准调控,降低了添加剂用量。某水平井改造后获平均水力缝长354.2m,平均单段改造体积60×10^(4)m^(3),压后获得无阻流量122.3×10^(4)m^(3)/d,较邻井提升3.4倍,平均综合费用降低约10%。Pay zones,which have been transformed from ClassⅠreservoirs to ClassⅡandⅢreservoirs,are rich in water and poor in gas and have poor continuity of target sand bodies.To ensure the stimulation effect of single well and regional economic development,an optimization method of tapping the technical potential deeply is proposed,considering the economy benefits based on the differentiated characteristics of sand body distribution,wellbore trajectory,closure stress,etc.,and to maximize the well-controlled sand body coverage.That is,the morphology of effective hydraulic propped fractures is reasonably optimized based on sand body distri-bution predicted by seismic interpretation.Segmentation principles are established,and the operation parameters are reasonably optimized based on wellbore trajectory and a comprehensive reservoir quality evaluation.The proppant combination is reasonably optimized to establish a matching conductivity according to different stress characteristics in various regions centered by reservoir characteristics,production well inversion data,and experimental results.Based on different proppant types and different fracturing stages,the fracturing fluid is optimized in real time on natural capacity to ensure effectiveness,accuracy,and low cost.The application results indicate that hydraulic fracture morphology matches sand body distribution,reducing the scale of ineffective fracturing.The segmentation is optimized based on the reservoir characteristics,and the number of reconstructed sections is appropriately controlled.The proppant combination adapted to the stress characteristics of different regions effectively increases the proportion of quartz sand.The precise regulation of fracturing fluid performance reduces the amount of additives.After the stimulation of a horizontal well,the average hydraulic fracture length is 354.2m.The average stimulated reservoir volume of a section is 60×10^(4)m^(3),and the open flow rate after fracturing is 122.3×10^(4)m^(3)/d,which is 3.4 times higher than that

关 键 词：致密砂岩 压裂改造 砂体展布 优化分段 支撑剂组合 差异化设计 

分 类 号：TE377[石油与天然气工程—油气田开发工程]