高孔高渗油藏深部调驱改善开发效果研究

Research on Improved Development Effect for Deep Water-Flooding in High Porosity and Permeability Reservoir

留西油田路36断块水平井二次开发转入人工注水后,暴露出储层非均质性强,水井层间矛盾突出,油井层间、平面见效不均的开发矛盾。利用监测手段开展改善水驱效果的研究,结合该油藏高孔高渗直注平采的特点,通过不断优化调驱体系,实现油层深部液流转向,与常规的注采关系完善相结合,进一步扩大水驱波及体积,改善主力油层层内、平面见效状况。采取"大剂量、小排量、变浓度"的深部调驱技术,改善了油藏的开发效果,使路36断块采收率由调驱前的35.48%提高到目前的44.49%。

After the horizontal wells of 36 fault block in Liuxi oilfield are transferred to the artificial water injection at the two development time,the contradiction of the strong heterogeneity of the reservoir,prominent contradiction between layers of the water well,and uneven of the oil well layer and the plane effect is exposed. By using monitoring manner to do research on improved water-flooding effect,combining feature of direct injecting and production by horizontal well in high porosity high permeability reservoir,and by continuously optimizing the drive system,flow steering of the deep reservoir fluid is achieved and combing with the conventional injection production relationship,the water flooding swept volume is further expanded,main reservoir layer,and the plane effective situation is improved.Taking the deep flooding technology of the 'high dose,small displacement,variable concentration',the reservoir development effect has been improved,so that the recovery rate of Lu 36 block rise to the current 44. 49% from 35. 48% before water-flooding.