裂缝性低渗透油藏注采系统调整技术研究

Research on injection-production system adjustment technique in fractured and low permeable reservoirs

裂缝性低渗透油藏,在正方形井网反九点注水方式开发过程中,表现出与裂缝走向一致的注采井见效快,含水上升快,甚至暴性水淹,而与裂缝走向垂直的注采井见效差,地层压力低、油井产液能力低。为此,通过对裂缝性低渗透油藏由反九点注水转线状注水渗流特点、油水井数比影响因素和注采系统调整作用的探讨,结合外围朝阳沟和头台等裂缝性低渗透油田注采系统调整效果,提出了适合外围油田不同裂缝走向与井排方向夹角井网转线状注水的合理调整方式,为裂缝性低渗透油田注采系统调整提供了理论和实践依据。

Based on discussion on fractured and permeable reservoirs,including characteristics of inverted nine-spot water injection transforming to linear water injection,influential factors of oil/water wells quantity ratio and injection-production system adjustment role,combined with injection-production system adjustment effects in fractured and low permeable oilfield of peripheral Chaoyanggou and Toutai,this paper proposes optimum adjustment scheme adapt to peripheral oilfield with different fractures direction and well pattern transforming to linear water injection in well array directional angle,which provides theoretical and practical foundation for injection-production system adjustment of fractured and low-permeable oilfields.