【作者】 曲萍萍；

【导师】 王业飞；

【作者基本信息】 中国石油大学 ， 油气田开发工程， 2007， 硕士

【摘要】 水溶性硅酸盐具有价格低廉、耐温、耐盐、注入性好、环境友好、可应用于苛刻条件的油藏等特点,在油田的调剖堵水中得到了广泛的应用。水溶性硅酸盐中最具代表性的是水玻璃,因此,对水玻璃进行研究对指导水溶性硅酸盐用于油田调剖堵水非常有益。本文研究了水玻璃作为调剖堵水剂的一些性质。包括与浓度很低的钙、镁离子反应生成沉淀的钙、镁敏;与高矿化度的盐水作用生成凝胶或沉淀的盐敏;在高温下生成沉淀的温敏;在酸性活化剂作用下生成凝胶的酸敏。结果表明,钙、镁敏受温度的影响很小;盐敏受矿化度影响很大,温度影响很小;温敏受温度、水玻璃质量百分浓度及时间的影响较大;酸敏受无机盐、温度、pH值的影响较大。除了对水玻璃特性及其影响因素的研究,还研究了以水玻璃为主剂的水玻璃复合体系,其中,水玻璃/尿素体系在高温(80℃~130℃)下生成凝胶,具有配制简单、耐高温、稳定性强等优点;水玻璃/HPAM体系在活化剂作用下生成凝胶,具有粘弹性好,低温(30℃~70℃)下稳定性好等优点。更多还原

【Abstract】 Due to its advantages of low cost, temperature tolerance, salt resistance, good injectivity, friendly environment and suitability to harsh reservoir conditions, soluble silicate is applied widely for profile control and water plugging in oilfield. Sodium silicate is the most representative soluble silicate, for which the study on sodium silicate is greatly important to guide the application of soluble silicate for profile control and water plugging in oilfield.The properties of sodium silicate as plugging agent are studied in the paper, including the sensitivity to calcium or magnesium which means reacting with calcium or magnesium ion even low concentration to pruduce deposits, the sensitivity to salt which means with hypersalinity saline water forming gel or deposit, the sensitivity to temperature which means generating deposits with high temperature and the sensitivity to acid which means bringing about gel under the effect of acidic activator. The results indicate that the sensitivity to calcium or magnesium is affected slightly by temperature, the sensitivity to salt is influenced greatly by salinity, while slightly by temperature, the sensitivity to temperature is affected dramatically by temperature, sodium silicate concentration and time, and the sensitivity to acid is influenced obviously by inorganic salt, temperature and pH value.Except study on the properties and influential factors of sodium silicate, a series of sodium silicate multisystems is studied with sodium silicate as the major agent. Among the sodium silicate multisystems, the sodium silicate and urea system forms gel under high temperature (80℃~130℃) with the advantages of easy preparation, high temperature tolerance and excellent stability, and the sodium and HPAM system forms gel affected by activator and presents perfect viscoelasticity and fine stability under low temperature(30℃~70℃).更多还原