摘要
胡尖山油田H区长4+5油藏为鄂尔多斯盆地典型低渗透油藏,低孔、低渗、低压。长4+5油藏为多期河道叠加复合砂体储层,隔夹层发育、非均质性强,多层合采、多层分层注水。经多年开发及井网加密调整后,注水沿高渗带及诱导缝突进,油井多方向见水,水驱开发矛盾突出,水驱开发效率低。通过梳理影响H区长4+5油藏水驱效率提高的关键影响因素,有针对性地采取治理对策,达到提高低渗油藏水驱效率的目的。结果表明,影响研究区油藏水驱效率提高的主要因素为储层砂体连通程度、储层非均质性、水驱后诱导裂缝及高深渗带发育、水驱后储层物性变化及分注井分层注水有效性等。通过采取油水井补孔、单层增注、深部调剖调驱、均衡平面采液、优化分注工艺等治理技术对策,油藏水驱效果得到改善,油藏最终采收率提高,油藏向良性开发转变。
Chang 4+5 reservoir in H area of Hujianshan oilfield is a typical low permeability reservoir in Ordos basin,with low porosity,low permeability and low pressure.Chang 4+5 reservoir is multi-stage channel superimposed composite sand body reservoir,with well-developed interlayers,strong heterogeneity,multi-layer combined production and layered water injection.After many years of development and well pattern adjustment,water injection advances along high permeability zone and induced fracture and water breakthrough occurs in multiple directions in oil wells,which results in prominent conflicts on water drive development and low efficiency on water drive development.Through analyzing the key factors affecting the improvement of water drive efficiency in reservoir 4+5 in H area,targeted treatment measures are taken to achieve the purpose of improving water drive efficiency of low permeability reservoir.The results show the main factors affecting the improvement of reservoir water drive efficiency in the study area are as follows:the connectivity of reservoir sand body,reservoir heterogeneity,induced fracture and development of high permeability zone after water flooding,changes of reservoir physical property after water flooding and the effectiveness of layered water injection in separate injection wells.Through the adoption of oil and water well holes replenishing,singlelayer enhanced injection,deep profile control and flooding,balanced plane fluid collection,optimization of injection technology and other treatment measures,the water drive effect of the reservoir and the ultimate recovery rate of the reservoir has been improved,and the reservoir has been transformed into positive devel opment.
作者
尹红佳
马强
胡晓雪
郑奎
王勇
韩博密
YIN Hongjia;MA Qiang;HU Xiaoxue;ZHENG Kui;WANG Yong;HAN Bomi(NO.7 Oil Production Plant of Changqing Oilfield Company,PetroChina,Xi'an,Shaanxi 710200,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an,Shaanxi 710075,China)
出处
《石油地质与工程》
CAS
2021年第1期77-81,共5页
Petroleum Geology and Engineering
关键词
胡尖山油田
长4+5油藏
低渗透
储层非均值性
水驱效率
Hujianshan oilfield
Chang 4+5 reservoir
low permeability
reservoir heterogeneity
water drive efficiency
