三元复合驱油体系钙硅混合垢形成特征研究  

Formation characteristics of calcium-silicon mixed scale in ASP flooding system

作　　者：赵千 ZHAO Qian(NO.4 Oil Production Plant of Daqing Oilfield Company,Daqing,Heilongjiang 163000,China)

机构地区：[1]中国石油大庆油田分公司第四采油厂

出　　处：《石油地质与工程》2019年第6期95-98,102,共5页Petroleum Geology and Engineering

摘　　要：三元复合驱油技术作为一种重要的三次采油技术,但加入碱造成油井严重的结垢问题,使生产效率降低、成本增加,限制了该技术的推广使用。为此,针对三元复合驱油体系中注入液、采出液以及垢样的特点,通过采用FTIR、XRD及SEM测试,对三元复合驱油体系中HPAM、HABS及碱对钙硅混合垢形成特征进行研究。结果表明,HPAM及HABS为单一体系时:低浓度的HPAM促进花生状混合垢的形成,随着HPAM浓度的增加,混合垢晶型向六面体状转化;较低浓度的HABS对混合垢晶型几乎无影响,较高浓度的HABS会促进蠕虫状混合垢的形成。在三元复合驱油体系中,碱浓度较低时会促进球形混合垢的形成,碱浓度较高时的混合垢晶型向六面体状转变。ASP flooding technology is an important tertiary oil recovery technology,but the addition of alkali will cause serious scaling problem in oil wells,which reduces production efficiency and increases cost,and limits its popularization and application.Therefore,according to the characteristics of injection fluid,produced fluid and scale sample in the ASP flooding system,the formation characteristics of mixed scale of calcium and silicon by HPAM,HABS and alkali in ASP flooding system were studied by FTIR,XRD and SEM tests.The results show that when HPAM and HABS are a single system,low concentration of HPAM promotes the formation of peanut-like mixed scale,and with the increase of HPAM concentration,the mixed scale crystalline form transforms to hexahedron-like;low concentration of HABS has almost no effect on the mixed scale crystalline form,while high concentration of HABS promotes the formation of worm-like mixed scale.In ASP flooding system,the formation of spherical mixed scale will be promoted when the alkali concentration is low,and the crystal form of mixed scale will change to hexahedron when the alkali concentration is high.

关 键 词：三元复合驱 钙硅混合垢 垢貌特征 

分 类 号：TE357[石油与天然气工程—油气田开发工程]