论文详情
耐温防乳驱油体系辅助稠油热采研究与应用
断块油气田
2020年 27卷 第3期
阅读：129
查看详情
Title
Study and application of oil displacement system of temperature resistant and anti-emulsion surfactant to assist heavy oil thermal recovery
作者
吴春洲1
张伟2
孙永涛1
王秋霞2
刘昊2
王少华1
单位
中海油田服务股份有限公司油田生产事业部，天津 300459
中海石油（中国）有限公司天津分公司，天津 300450
Organization
Oilfield Production Department, China Oilfield Services Ltd., CNOOC, Tianjin 300459, China
Tianjin Branch of CNOOC Ltd., Tianjin 300450, China
摘要
稠油热采过程中，蒸汽冷凝水易于稠油乳化而形成油包水乳状液，造成地层乳化堵塞、产出液处理困难等问题，使热采驱油效果变差。针对以上问题，对一种耐高温防乳驱油体系的静态性能（耐温性能，防乳、破乳性能，降黏效果和界面性能）和动态驱油效果进行了室内评价。实验结果表明：该体系280 ℃老化4 h后，地层温度下的防乳化率为83%，降黏率67%；溶液与稠油之间的界面张力为0.051 mN/m；润湿角为8°，可使岩石表面润湿性由油湿转变为水湿；破乳率为89%，有助于后续产出液的处理；体系可使稠油热采驱油效率提高11.6百分点；优化后的体系溶液最佳注入质量分数为0.5%。该体系在渤海某稠油油田热采过程中共实施3井次，取得了良好的应用效果。
Abstract
In the process of heavy oil thermal recovery, the condensate from steam is easy to emulsify heavy oil to form wate-in-oil emulsion, which causes the formation emulsification and blockage. Then the output liquid is difficult to deal with, and the oil displacement effect becomes worse. In view of the above problems, the static performance(temperature resistance, anti-emulsion, demulsification performance, viscosity reduction effect and interface performance) and dynamic oil displacement effect of temperature resistant and anti-emulsion surfactant are evaluated. The experimental results show that the system can withstand temperature of 280 ℃. After aging for 4 hours at 280 ℃, the anti-emulsion rate was 83% and viscosity reduction rate was 67% at the formation temperature of 55 ℃. The interfacial tension between the system solution and heavy oil is 0.051 mN/m. The wetting angle of the system was 8°, which can cause the change from oil-wet to water-wet on the rock surface. The demulsification rate of the system was 89%, which is helpful for the subsequent output liquid treatment. The dynamic oil displacement experiments show that the system to assist heavy oil thermal recovery can increase oil displacement efficiency by 11.6%， and the optimal concentration of system was 0.5%, the system was used for 3 wells in the thermal production process of a heavy oil field in Bohai.
论文详情