摘要
裂缝性低渗透油藏发育着复杂的裂缝网络,随着注水开采程度的加深,过高的注入压力和过量的注水会引起微裂缝开启、起裂、扩展和相互贯通,在注采连线形成高渗透带,导致注入水单向突进,油井含水上升快,造成油井水淹和窜流严重,降低了油田的最终采收率。针对注水开发过程中储层裂缝系统的演化贯通给油田开发带来的困难,研究分析了天然裂缝内注入水渗流对裂缝起裂的影响,应用岩石断裂力学理论分析了天然裂缝性储层在注水开发过程中裂缝系统的相互作用,研究了注入压力作用下天然裂缝的开启、扩展延伸和相互贯通的力学机理,对天然裂缝性储层注水开发过程中研究裂缝的分布规律、确定合理的注水方式和注水压力、延缓注水开发过程中油井方向性水窜和水淹速度具有重要的理论指导意义。
With the development of water flooding production, because of the complex fracture networks exist in low permeability fractured reservoirs, unreasonable injection pressures and excess water injection rate result in opening, fracturing, propagation and coalescence of fracture, which will bring on a high permeability zone between injection and production and lead the injected water move more rapidly along the coalescent fracture networks which rise water out in these zones, then most of oil production wells are caused severe watered-out and channeling , and the ultimate recovery factor of oilfield is decreased . To try to solve these problems, the paper studied the effect of injection water seepage on fracturing of fractures in natural fractured reservoirs. Based on the theory of rock fracture mechanics, the interaction of fracture networks in the waterflooding natural fractured reservoirs was analysed. Then, the mechanics models of opening, propagation and coalescence of fracture networks are set up to study the distribution of new fracture system, determine rational flood project and injection pressure, and delay directional water channeling and watered-out velocity.
出处
《钻采工艺》
CAS
北大核心
2006年第4期57-60,4,共4页
Drilling & Production Technology
基金
重庆市自然科学基金:裂缝性水驱气藏气井动态分析方法研究(编号:CTSC
2005BB6289)
国家自然科学基金资助项目(编号:90210022)资助。
关键词
断裂力学
裂缝性储层
裂缝扩展
裂缝贯通
水淹
注水
fracture mechanics, fractured reservoir, fracture propagation, watered out, water injection
