摘要
安塞油田长6特低渗透油藏注水开发多年,水驱前缘已经波及储层高渗透带,大量剩余油分布于储层纵向低渗段。为开发低渗段剩余油,采用定面射孔压裂技术,利用定面射孔形成垂直于井筒轴向的扇形应力集中面,引导水力裂缝沿井筒径向扩展,控制裂缝纵向延伸,实现低渗段剩余油挖潜。在研究长期注采条件下的剩余油分布及岩石力学参数变化特征的基础上,模拟分析不同定面射孔相位角下的裂缝起裂效果,根据裂缝融合面积优选出最佳射孔相位角;同时,根据较小应力差条件下的裂缝模拟结果,优化压裂改造参数,控制裂缝高度。安塞油田78口井长6油藏开发中应用了定面射孔压裂技术,平均单井增油量达1.8t/d,是常规压裂的2倍以上,取得了较好的效果。研究与应用表明,定面射孔压裂技术可为特低渗透油藏低渗段剩余油挖潜提供新的技术手段。
The Ansai Chang 6 ultra-low permeability reservoir has been developed for many years.The front edge of water flooding has swept the high permeability reservoir zone,and a large amount of remaining oil was distributed in the longitudinal low permeability zones of this reservoir.In order to tap the remaining oil in the low-permeability zone, a fixed-plane perforating and fracturing technology was put forward to form a fan-shaped stress concentration plane perpendicular to the wellbore axis,guide the radial extension of hydraulic fractures along the wellbore and control the longitudinal extension of the fractures,so as to tap the potential of remaining oil in the low permeability zone.Based on the studies of remaining oil distribution and the variation characteristics of rock mechanics parameters under long-term injection and production conditions.Then,the effect of fracture initiation under different fixed-plane perforating phases was simulated and analyzed,and the optimized the perforating phase angle according to the size of fractures fusion area.At the same time,the parameters of fracturing stimulation were optimized according to the results of fracture simulation under weak stress difference,by which the fracture height was controlled effectively.The fixed-plane perforating and fracturing technology was applied in 78 wells of the Ansai Chang 6 reservoir.The average daily oil increase per single well was 1.8 t/d after the stimulation,about twice higher than that of the conventional fracturing technologies,with the good results.The research and application of fixed-plane perforating and fracturing technology has provided a new technical means for tapping the potential of remaining oil in low-permeability zone of ultra-low permeability reservoirs.
作者
段鹏辉
雷秀洁
来昂杰
张同伍
康博
DUAN Penghui;LEI Xiujie;LAI Angjie;ZHANG Tongwu;KANG Bo(Oil &Gas Technology Research Institute,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi,710018,China;Exploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi,710018,China;The No.1 Oil Production Plant,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi,716000,China)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2019年第5期104-109,共6页
Petroleum Drilling Techniques
基金
中国石油天然气股份有限公司勘探与生产项目“长庆油田5000万吨持续高效稳产关键技术研究与应用”(编号:1602–1–4)部分研究内容
关键词
特低渗透油藏
低渗段
定面射孔
压裂
剩余油
挖潜
安塞油田
ultra-low permeability reservoir
low permeability interval
fixed-plane perforating
fracturing
remaining oil
tap production potential
Ansai Oilfield
