摘要
就地聚合堵剂由于具备良好的注入性、成胶时间可控及成胶强度大等优点受到了广泛关注,而针对高温高盐油藏的就地聚合堵剂的成胶时间和稳定性还需进一步优化。实验研究了不同矿化度对体系成胶性能的影响,并对比了Na+,Ca2+,Mg2+这3种阳离子的影响程度。结果表明:3种阳离子对胶体稳定性影响由大到小依次为Ca2+,Mg2+,Na+;Na+对成胶时间影响最大,对胶体稳定性影响最小,可使凝胶堵剂保持较长时间不脱水;随着各离子质量浓度的不断增加,胶体稳定性降低。
In-situ polymerization plugging agent has been widely concerned due to the advantages of good injection property,controllable gelation time and strong gel strength. However, the gelation time and stability of high temperature and high salinity reservoirs need to be further improved. In this paper, the effects of different salinity types on the gelation performance have been researched experimentally and the infuence degree of Na^＋, Ca^2＋and Mg^2＋is compared. The results show that some cations in the formation water, to some extent, play a positive role in promoting the gelation time and gelation strength of system. The order of their effects on system gelation is as follows： Ca^2＋〉Mg^2＋〉Na^＋. Na^＋has the greatest effect on the gelation time of plugging agent and has the minimum impact on the stability of colloid, which can keep the gel plugging agent from syneresis for a long time. As the concentration of each ion increases, the stability of colloid decreases.
出处
《断块油气田》
CAS
北大核心
2015年第1期98-101,共4页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题"碳酸盐岩缝洞型油气藏控水及堵水技术应用"(2008ZX05049-005-007HZ)
关键词
就地聚合
凝胶
堵剂
高温高盐油藏
离子
in-situ polymerization
gel
plugging agent
high temperature and high salinity reservoir
ion
