南海流花油田储层特征及敏感性评价  

Characteristics and Sensitivity Evaluation of Liuhua Oilfield in South China Sea

作　　者：张鹏[1] 马东[1] 续化蕾 王哲 ZHANG Peng;MA Dong;XU Hua-lei;WANG Zhe(School of Petroleum Engineering,Yangtze University,Wuhan 430000,China)

机构地区：[1]长江大学石油工程学院

出　　处：《科学技术与工程》2019年第16期112-117,共6页Science Technology and Engineering

基　　金：中国石油科技创新基金(2018D-5007-0208)资助

摘　　要：南海流花油田经过长时间注水开发后出现注水压力上升、注水量下降以及达不到配注要求等问题。为此,通过对该油田注水层段储层特征分析以及储层敏感性实验评价,找出注水过程中潜在的损害因素,并提出合理的储层保护措施建议。储层特征分析结果表明:储层岩石类型以岩屑石英砂岩、长石岩屑石英砂岩为主,黏土矿物以伊/蒙混层和蒙脱石为主;储层物性良好,属于中孔、中渗储层;地层原油性质较好,属于轻质原油,地层水型为NaHCO3水型。敏感性实验结果表明:储层临界流速为5mL·min^-1,具有弱速敏;临界矿化度为4480mg·L^-1,储层具有强水敏;储层不存在盐酸敏感性,存在弱土酸敏;临界pH为13,储层具有弱碱敏。在油田后续注水过程中应严格控制注水速度、控制入井流体的矿化度和pH,采取合适的酸化处理措施等。After a long period of water flooding development in South China Sea Liuhua oilfield,problems such as increasing water injection pressure,decreasing water injection rate and failing to meet the injection allocation requirements appear.Therefore,through the analysis of reservoir characteristics and reservoir sensitivity evaluation,the potential damage factors in the process of water flooding are found out,and reasonable reservoir protection measures are put forward.Reservoir characteristics analysis results show that the reservoir rock types are mainly lithic quartz sandstone and feldspar lithic quartz sandstone,clay minerals are mainly Illite/montmorillonite layer and montmorillonite;Reservoir physical properties are good,belong to medium porosity and permeability reservoir;Formation crude oil properties are good,belong to light crude oil,formation water type is NaHCO 3 water type.Sensitivity test results show that the reservoir has a weak velocity sensitivity with a critical flow rate of 5 mL·min^-1,a critical salinity of 4 480 mg·L^-1,a reservoir with strong water sensitivity,a reservoir without hydrochloric acid sensitivity,a weak soil acid sensitivity,a critical pH of 13,a reservoir with weak alkali sensitivity.During the follow-up water injection process in the oilfield,the injection rate,the salinity and pH of the fluid entering the well should be strictly controlled,and appropriate acidizing treatment measures should be taken.

关 键 词：南海油田 储层特征 注水开发 敏感性评价 储层保护 

分 类 号：TE358[石油与天然气工程—油气田开发工程]