橡胶—聚合物冻胶体系堵水适应性分析

Adaptability analysis on rubber-gel composite system for water shutoff

通过室内评价实验和封堵性实验,对橡胶—聚合物冻胶体系和聚合物冻胶体系进行了对比。实验结果表明,在相同的温度、p H值和矿化度条件下,橡胶—聚合物冻胶体系的粘度和强度均优于聚合物冻胶体系;分别向渗透率相近的2个填砂管注入上述2个体系,封堵率均达97%以上,但是注橡胶—聚合物冻胶体系突破压力梯度为4.97MPa/m,远大于注聚合物冻胶体系的3.08 MPa/m,而且其耐冲刷性良好,在水驱7倍孔隙体积以后,达到稳定压力2.35 MPa,而聚合物冻胶体系则在水驱4倍孔隙体积后,压力就开始下降,稳定压力为1.12 MPa;不同渗透率的封堵实验则表明橡胶—聚合物冻胶体系在高渗透层的封堵性最好。

This paper does research on the natural capacity of the synthetic rubber-gel system through indoor experiment in contrast to the gel system. It is proved that at the same temperature, mineralize, p H, the natural capacity of the rubber-gel system is better than that of the gel system. In the following plugging experiment, the plugging rate of the rubber-gel system is above 97% which is similar to that of the gel system; however its breakthrough pressure is 4.97 MPa/m which is much higher than that of the gel system, 3.08 MPa/m,and its washing resistance is also better than that of the gel system. When the water flooding is above 7 PV, its pressure maintains stable at 2.35 MPa, However, the pressure of the gel system reduces gradually after the 4 PV water flooding, and the stable pressure is only 1.12 MPa, which is much lower than that of the rubber-gel system; the plugging experiment of the different permeability states that the rubber-gel system has greater performance in high permeability layer.