海相砂岩薄层稠油油藏地热水驱效果评价  

Evaluation of the effect of geothermal water flooding on offshore marine sandstone thin heavy oil reservoir

作　　者：涂志勇 谢明英 冯沙沙 卫喜辉 TU Zhiyong;XIE Mingying;FENG Shasha;WEI Xihui(Research Institute of Shenzhen Company of CNOOC(China)Co.,Ltd.,Shenzhen Guangdong 518054,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司研究院,广东深圳518054

出　　处：《石油化工应用》2024年第2期38-42,53,共6页Petrochemical Industry Application

摘　　要：南海东部薄层边水稠油油藏注地热水开发效果好,鲜有针对地热水驱提高采收率机理及开采效果方面的研究。本文从稠油注热实验、考虑围岩热损失的数值模拟以及矿场实践三个维度研究地热水驱提高稠油采收率机理及效果。研究结果表明,注地热水可以大幅降低原油黏度,残余油饱和度降低7.24%~8.22%,驱油效率提高8.85%~9.11%;注地热水油藏早期水驱前沿与周围地层发生热交换,温度迅速降低,地热水驱影响范围在50~150 m,以低速均匀注水保压驱油为主;后期通过大液量提高温度的波及范围,提高注热采收率。E油藏注地热水后采油井产量快速上升,注水井吸水指数因近井地带黏度降低、水相渗透率提高而逐步增大。通过完善注采井网,油藏压力系数逐年上升,产量持续增加,预测采收率达到40.0%,注热提高采收率4.8%。The geothermal water flooding in thin heavy oil reservoirs with edge water in eastern South China Sea has shown a good development result,but the enhanced oil recovery(EOR)mechanisms and development effect of geothermal water flooding have not been revealed.In this paper,we considered heavy oil thermal recovery,simulation of the heat loss to surrounding rock and field practice to study the heavy oil EOR mechanisms and effect from geothermal water flooding.The results showed that geothermal water flooding can significantly reduce the viscosity of crude oil,the residual oil saturation can be reduced by 7.24%~8.22%and the oil displacement efficiency can be increased by 8.85%~9.11%.In the early stage of geothermal water flooding,heat exchange occurs between the waterflood front and the surrounding strata,and the temperature decreases rapidly,the influenced range of geothermal water flooding is 50~150 m.The recovery method is to use low speed uniform water flooding to maintain pressure and to produce oil.In the later stage,the oil recovery of geothermal water flooding can be improved by increasing temperature sweep area with higher injection rate.After the injection of geothermal water in E oil reservoir,the production of oil well increases rapidly,and the water injection well water absorption index increases gradually due to the decrease of the near-well viscosity and the increase of the water phase permeability.With the improvement of injection-production well pattern,the reservoir pressure coefficient increases year by year,and the oil production continues to increase.The predicted recovery rate is 40.0%,and the enhanced recovery rate of geothermal water flooding reaches 4.8%.

关 键 词：海相砂岩 稠油 注地热水 热损失 采收率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]