常规稠油油藏水驱开发初期可动凝胶调驱效果———以华北油田泽70 断块为例

常规稠油油藏原油粘度较高,水驱开发效率较低,导致最终采收率不高。为探索改善常规稠油油藏水驱开发效果的新技术,开展了可动凝胶调驱技术改善稠油开发效果的可行性研究,结果表明,在油田开发初期这是一种有效的开发方式。针对华北油田泽70断块常规稠油油藏水驱开发特征,在开发初期开展了可动凝胶调驱先导试验,并推广到整个区块。应用可动凝胶调驱1a后,注入压力明显提高,吸水剖面得到改善,生产井含水率上升速度得到有效控制,综合含水率由47.5%下降到37.4%,采油速度由0.82%提高到2.1%,阶段累积增产油量为12787t,提高采收率为1.58%,取得了较好的增油降水效果。

Application performance of mobile gel in earlier stage of water flooding for conventional heavy oil field-case of Ze 70 block,Huabei oilfield

The oil viscosity in conventional heavy oil reservoir is very high,and the oil recovery of water-flooding is very low.The study of the feasibility of using mobile gel in-depth fluids diversion to improve the performance of water-flooding in conventional heavy oil reservoir is carried out.The result indicates that the mobile gel in-depth fluids diversion is an effective approach to improve the performance of water-flooding for the development of conventional heavy oil field.According to the feature,oil recovery of water-flooding is very low in Ze 70 complex-faulted block,the pilot test of mobile gel in-depth fluids diversion in early stage is carried out in order to improve the result of water-flooding,and then it is extended to the whole block.After one-year injection,injection pressure rises obviously and injection profile is improved,moreover,the ascending velocity of water-cut is controlled and the water cut declines to 37.4% from 47.5%,while the producing rate rises to 2.1% from 0.82%,the recovery factor is 4.05% higher than that of water-flooding,and the input-output ratio is 1:2.48.The result of the pilot is satisfied.