浅层疏松砂岩稠油油藏聚合物驱矿场试验效果评价  

Effect Evaluation on the Industrial Experiment with Polymer Flooding in the Shallow Unconsolidated Sandstone Heavy Oil Reservoir

作　　者：吕斌 LV Bin(Sinopec International Petroleum Exploration and Production Corporation,Beijing 100029,China)

机构地区：[1]中国石化集团国际石油勘探开发有限公司,北京100029

出　　处：《科学技术与工程》2019年第10期82-88,共7页Science Technology and Engineering

摘　　要：哈萨克斯坦CB油田具有埋藏浅、胶结疏松、地下原油黏度大、地层水矿化度高、储层高孔高渗的特点,经过多年的注水开发后,地层非均质性加剧、注水波及效率低、采出程度低、综合含水高,油水关系日趋复杂,开发效果亟待改善。开展聚合物驱试验的目的是通过优选适合CB油田特征的抗盐聚合物体系,实现封堵高渗流通道、改善吸水剖面、增大水驱波及体积,达到深度调驱、提高采收率的目的。通过在油田4个井组应用聚合物复合弱凝胶实施聚合物驱试验,结果表明聚合物复合弱凝胶有较强的适应性,注聚施工后井组平均日产油量增加了21. 7 t,平均含水下降了7. 7%,降水增油效果显著,累计增油超过2×104t。建议在该油田针对不同区块的地质油藏特点精选注聚井组,通过推广应用逐步扩大注聚规模、形成集中效应,不断提升油田的开发效果。CB oilfield in Kazakhstan is characterized by shallow-buried,loose-cemented,with high oil viscosity,high formation water salinity and high porosity and permeability reservoir. After years of waterflood development,formation heterogeneity becomes higher,waterflood sweep efficiency is low,recovery degree is low,water cut is high,oil-water relationship becomes more complex,development effect needs to be improved. The purpose of polymer flooding experiment is to plug high permeability crossflow channels,improve water injection profile,increase the sweep volume of water flooding,realize deep profile control and flooding,and enhance oil recovery by optimizing salt-resistant polymer system,which is suitable for the characteristics of CB oilfield. By using polymer composite weak gel in four well groups of the oil field to carry out the polymer flooding experiment,the result shows that the polymer composite weak gel has strong adaptability. After the polymer injection,the average well group daily oil production increases by 21.7t,the average water cut decreased by 7.7%,the effect of oil production increasing and water cut decreasing is significant,and the cumulative oil production increases more than 20000t. It is suggested that polymer injection wells should be selected carefully according to the characteristics of different geological areas in the oilfield,and the injection scale should be gradually enlarged by popularizing application to form a concentrated effect,so as to continuously improve the development effect of CB oilfield.

关 键 词：疏松砂岩 稠油油藏 聚合物驱 降水增油 提高采收率 

分 类 号：TE345[石油与天然气工程—油气田开发工程]