特低渗透油藏提高采收率驱油体系筛选及应用  

Selection and Application of Oil Displacement System for EOR in Extra-Low Permeability Reservoirs

作　　者：赵继勇[1,2] 熊维亮 范伟[1,2] 李姝蔓 ZHAO Jiyong;XIONG Weiliang;FAN Wei;LI Shuman(PetroChina Changqing Oilfield Company,Research Institute of Exploration and Development,Xi’an,Shaanxi 710018,China;PetroChina Changqing Oilfield CompanyNational Engineering Laboratory for Exploration and Development of Low Permeability Oil/Gas Field,Xi’an,Shaanxi 710018,China)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,西安710018 [2]中国石油长庆油田分公司低渗透油气田勘探开发国家工程实验室,西安710018

出　　处：《新疆石油地质》2019年第6期720-724,共5页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05050);中国石油科技重大专项(2016E-05)

摘　　要：为提高特低渗透油藏采收率,以长庆W油田三叠系延长组长6特低渗透油藏为对象,开展与油藏特征相适应的提高采收率驱油体系研究。通过对不同界面活性、乳化性能、黏度等性能的驱油体系驱油效率评价,明确了适合特低渗透油藏提高采收率的表面活性剂性能指标,首要指标是乳化性能,其次是界面活性,只有两者兼顾,才能大幅度提高驱油效率。岩心驱替实验结果表明,高界面活性强乳化低黏型CQ-Ⅰ驱油体系,可在水驱基础上提高驱油效率28.9%以上。根据室内研究成果,在长庆W油田A区开展了4井组现场试验,截至2017年12月,试验井组累计增油量5889.9 t,阶段投入产出比1∶2.25,取得了较好的应用效果。How to effectively improve the recovery factor has always been a difficulty for extra low permeability reservoir development.Tak ing the Triassic Chang 6 reservoir,a typical extra low permeability reservoir in Changqing oilfiled as a case,the paper studies the oil dis placement systems which could match with the reservoir characteristics to improve the oil recovery factor.Based on the evaluation of the oil displacement efficiencies of different displacement systems with different interfacial activities,emulsifying properties and viscosities,the paper identifies that the emulsifying property is the primary indicator of the screening of surfactant for extra low permeability reservoirs,fol lowed by the interfacial activity.When the oil displacement agent has the both characteristics,the oil displacement efficiency can be great ly improved.A surfactant flooding system with high interfacial activity,strong emulsibility and low viscosity is screened out and the result of core displacement experiment shows that the CQ I system can increase oil displacement efficiency by more than 28.9%based on water flooding.Based on the results of indoor research,a field test of 4 well groups was carried out in District A of W Oilfield in Changqing oil field.By the end of December 2017,the incremental oil production of the test well group was 5889.9 t,and the input output ratio was 1∶2.25 at that stage,showing good application effects.

关 键 词：特低渗透油藏 提高采收率 驱油剂 乳化作用 驱油效率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]