低浓度弱碱三元复合体系与高温油藏的适应性  

Adaptability of Low Concentration Weak Base ASP Displacement System for High Temperature Reservoir

作　　者：李永太[1] 鲁永辉[2] 董帅[3] 孔柏岭[4] LI Yongtai;LU Yonghui;DONG Shuai;KONG Bailing(College of Petroleum Engineering,Xi＇an Shiyou University,Xi＇an,Shaanxi 710065,P R of China;Wuqi Oil Production Plant,Yanchang Oil field company Ltd.,Wuqi,Shaanxi 717600,P R of China;No.2 Oil Production Company,Daqing Oil field Company Ltd.,Daqing,Heilongfiang 163414,P R of China;Research institute of Petroleum Exploration and development,Henan Oilfield Branch Company,Sinopec,Nanyang,Henan 473132,P R of China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]延长油田股份有限公司吴起采油厂,陕西吴起717600 [3]中国石油大庆油田有限责任公司第二采油厂,黑龙江大庆163414 [4]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《油田化学》2018年第2期316-321,共6页Oilfield Chemistry

基　　金：中石化集团公司提高采收率重大先导项目"双河油田Ⅳ5-11层系水驱开发后期井网重组化学驱先导试验"(项目编号P07067)

摘　　要：为了改善特高含水高温油藏Ⅳ5-11层系水驱开发效果,系统研究了Na_2CO_3弱碱三元复合体系与高温油藏的匹配关系。室内研究与现场应用结果表明,Ⅳ5-11层系油藏条件下,弱碱三元复合体系(Na_2CO_3/表面活性剂SH6/聚合物ZL-Ⅱ)高温稳定性好,在81℃下老化180 d后,油水界面张力维持在10^(-4)m N/m数量级,黏度保留率为147.6%;该体系对地层溶蚀作用较弱、碱耗小、地层伤害不明显,地面碱结垢现象不严重,Na_2CO_3具备从注入井到油井全程作用的能力。弱碱三元复合驱技术在Ⅳ5-11层系现场应用取得优异的增油降水效果,峰值含水由97.9%降至90.2%,日产油由23.0 t升至106.1 t,阶段提高采收率9.1个百分点,预计最终提高采收率14.2%。In order to improve water flooding efficiency of zone IV5-11, a mature field with high temperature of 81.0℃, high water cut of 97.9% and high recovery factor of 53.3%, the adaptability of weak base （Na2CO3） ASP displacement system for high tempera- ture reservoir was studied. The expedmantal results and field application results showed that the long term thermal stability of weak base ASP flooding formula was good, after ageing 180 days at 81 ℃, the interracial tansion（IFT） between the system and the crude oil maintained about 104 mN/m magnitude, and viscosity retention ratio was 147.6%. The damage of the system to the formation is not obvious with weak dissolution and low alkali consumption under IV 5-11 reservoir conditions. The Na2CO3 played a great role in the whole process from the injecting well to the produced well. The weak base ASP flooding technology had been used in IV 5-11 block successfully, the oil production of center produced well increased from 23.0 t/d to 106.1 t/d, water cut reduced from 97.9% to 90.2%, the oil recovery had been enhanced by 9.1% OOPI, the predicted oil recovery would be increased by 14.2% OOPI.

关 键 词：提高采收率 碳酸钠 三元复合驱 高温稳定性 碱耗 碱结垢 高温油藏 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]