一种聚合物凝胶暂堵剂的研制及其应用

Development of Polymer Gel Temporary Plugging Agent and the Application

老君4井为普光边缘的一口高含硫气井,经酸压后,地层压力系数低,液面亏空达1200 m,需进行高强度暂堵后才可进行投产作业,且该井安装两个间隔1 m且内径小(45 mm)循环阀,常规暂堵剂无法顺利通过循环阀内径。针对以上难题,以AMPS、AM为单体,复合一定粒径的无机材料,协同盐和除氧剂等材料,开发出了聚合物凝胶暂堵剂并在老君4井进行了成功应用,室内和现场实验表明:聚合物凝胶暂堵体系130℃下高黏度维持时间长达15 d以上,封堵承压达27 MPa,可阻滞高含硫气从井筒逸出,解堵率高,投产后产量约1.20×10^(6)m^(3)/d,应用效果良好。

Laojun 4 Well is a high sulfur gas well located on the edge of Puguang,after acid fracturing,The formation pressure coefficient is low,before putting into production,the temporary plugging is necessary,but there has two Circulation valves stalled within 1m,the normal temporary plugging agents cannot smoothly pass through the inner diameter of the circulation valve.In view of the above problems,a polymer gel temporary plugging agent has been developed and successfully applied in Laojun 4 Well.Laboratory and field experiments show that the polymer gel temporary plugging agent has a plugging pressure of 27 MPa and a validity period of 15 days at 130℃,with the high plugging removal rate,it can block the gas escape from the wellbore.After being put into production,the output is about 1.2 million m^(3)/d,the effect of site application is super.