Anti-ageing Mechanism for Branched Preformed Particle Gel in Saline Solution Under High-temperature and High-salinity Conditions
The old oilfield in China has 15 million tons of petroleum geological reserves,and the polymer flooding technology has been implemented.Half of the crude oil is still remained underground and further improving the recovery efficiency after polymer flooding is a world-class problem.In view of the situa-tion,Branched Preformed Particle Gel(B-PPG)is developed,which not only has a crosslinked network but also linear branched chains.The special structure of B-PPG provides particular performances,i.e.,the crosslinked network provides a gel with an excellent temperature tolerance mechanism,elastic deforma-tion and anti-shearing properties,while the water soluble linear branched chains provide high viscosity and suspension properties.On this basis,heterogeneous chemical flooding system was built by introducing high performance surfactant and linear polyacrylamide.The technology has been applied to the reservoirs after polymer flooding in Shengli Oilfield,and the recovery factor has increased by more than 8 percentage points.It has become a new generation of chemical flooding technology after polymer flooding.The aging resistance of B-PPG in saline solution,with a mineralization of 30 000 mg/L,at 85℃for 3 months was studied.The results showed that,compared with the poor performance of HPAM,the degradation failure rate of B-PPG obviously slowed down,with an apparent viscosity of 1.83 Pa·s,viscosity retention of 303%,and hydrolysis degree increasing by an additional 29.4%after the ageing test.On this basis,an an-ti-ageing mechanism for B-PPG was proposed.
B-PPG polymer flooding anti-ageing mechanism oil displacement agent heterogeneous chem-ical flooding
Zongyang Li Yangwen Zhu Lanlei Guo Hongyan Wang Xulong Cao Zuming Jiang Yefei Wang
School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,Ch Exploration and Development Research Institute of Shengli Oilfield,SINOPEC,Dongying,Shandong,257015, School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,Ch
国内会议
青岛
英文
39-44
2018-06-20（万方平台首次上网日期，不代表论文的发表时间）