【摘要】 渗透率较好的注水油田到开发中后期,注采平面矛盾日趋突出,含水严重,但油藏采出程度却很低。通过室内实验研究结果表明:对中高渗高注水开发油田在开发后期进行弱凝胶调剖,可以改善吸水剖面并提高采收率,但提高采收率幅度有限。在调剖后,注入表面活性剂体系、聚表二元体系,均能在弱凝胶调剖的基础上再提高采收率达十个百分点。两体系相比之下,表面活性剂体系,能更明显地提高非均质性突出的注水油田的采收率。更多还原

【Abstract】 As the oilfield with good permeability developed into the middle-latter period, a contradiction of injection-production become serious and the recovery of reservoir is very low. By experiment, it indicates that making weak gel’s profile modification for high permeability and high water cut reservoir can improve the water injection profile and enhance the oil recovery, but the amplitude of enhancing the oil recovery is limited. For the polymer/surfactant slug, polymer and surfactant dual systems are injected separately, oil recovery may be enhanced by 10 percent after the water injection. Comparatively, the polymer/surfactant slug system can obviously enhance the high heterogeneous reservoir recovery.更多还原