复合凝胶堵剂的研制及应用

简要介绍了复合凝胶堵剂的制备方法.考察了凝胶含量、凝胶体系溶液pH、溶液温度、地层水矿化度对成胶速度和成胶黏度的影响.结果表明,凝胶含量在0.8％ ～ 2.0％,溶液pH 7.0 ～9.0,溶液温度65℃,地层水矿化度达20 000 mg/L条件下,凝胶溶液具有很强的成胶能力,并且成胶速度快,成胶黏度高.岩心封堵模拟实验结果表明,该凝胶堵剂封堵率达96.7％,高渗分流率由堵前82％下降到10％,低渗分流率由堵前18％上升到90％,有效封堵窜流通道,启动低渗通道.现场应用效果明显,压力比措施前上升4.5 MPa,增油量达569.1 t,投入产出比为1∶3.36.

Preparation and Application of Composite Gel Plugging Agent

Preparation of composite gel was introduced briefly in this article.The influences of gel content,pH value and temperature of the gel solution,and formation water salinity on gelation rate and gel viscosity were studied.The results showed that at pH value of 7.0-9.0 and 65 ℃,when the gel content was 0.8%-2.0%,and formation water salinity was 20 000 mg/L,the gelling ability of the gel solution is excellent,with rapid gelling speed and high gel viscosity.The core plugging simulation experiments illustrated that the plugging rate of this gel was 96.7%.The shunt rate of high permeable tube decreased from 82% to 10%,and the shunt rate of low permeable tube increased from 18% to 90%.This gel could block off channeling path effectively so that the low permeable tube was actuated.The results of field application showed that the pressure is 4.5 MPa higher than before,and the oil enhanced is 569.1t,with input and output ratio of 1:3.36.