有机多元酸(SY)缓速及防沉淀性能研究  

Retardation and Deposition Control Mechanism of Organic Multivariate Acid (SY)

作　　者：景步宏[1] 

机构地区：[1]中国石化江苏油田分公司石油工程技术研究院,江苏扬州225009

出　　处：《石油钻探技术》2009年第3期103-106,共4页Petroleum Drilling Techniques

基　　金：中国石化江苏油田分公司科研项目"低渗透油藏降压增注技术应用研究"(编号:JD06002)部分研究内容

摘　　要：土酸在用于砂岩储层酸化时存在酸液穿透距离短、产生二次沉淀、措施效果不理想及有效期短的缺点,为此,江苏油田研究应用了一种含有羟基、羧基基团的有机磷酸与氟盐的混合酸液体系——有机多元酸。该酸液体系能够缓慢电离出氢离子,与黏土、石英矿物的反应速率明显低于常规土酸,且具有良好的阻止二次沉淀生成的能力,适合于蒙脱石、高岭石、绿泥石含量较高的储层酸化改造。5口井的现场应用效果表明,该酸液起到了良好的降压增注及增产效果。The acidification of sandstone usually uses the acid system which contains HF. However, most of acids are consumed near the wellbore and cause secondary precipitation, and the results and effective period are not good. Thus, the purpose of this research is to choose an excellent acid system, which can reduce the speed of reaction of HF and hydrosyalite, avoid the secondary precipitate, and improve the effect of acidification. This paper analyzed the characteristic of organic multivariate acid system （SY） and the mechanism of retardation. SY could ionize hydrogen ion and keep the pH of acid, the reaction speed of HF and clay and quartz are slower than that of HF. It can control the secondary precipitation which is suitable for formation contains montmorillonite, kaolinite and chlorite. The applications in 5 wells indicate that it enhanced production obviously.

关 键 词：土酸 有机多元酸 酸化效果 防止地层损害 江苏油田 

分 类 号：TE358[石油与天然气工程—油气田开发工程] O655.22[理学—分析化学]