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油井堵水或减少油井产水是石油工业中必须解决的问题。聚合物驱可降低油藏的水相渗透率,此外,由于聚合物在岩石表面吸附油藏的非均质性降低。研究了两种类型的聚合物—聚丙烯酰胺(PAA)和聚糖(黄原胶),评价了不同矿化度、剪切速率和浓度条件下两种聚合物溶液的黏度。首先将准备好的聚合物溶液注入到岩心,目的是通过计算阻力系数和残余阻力系数来评价聚合物在岩石表面的吸附。此外,进一步研究了聚合物溶液注入速率的影响,结果表明:黄原胶溶液有高的耐盐性(20%),而PAA对盐非常敏感;还需要温度与之配伍,可直达60℃;也发现注入速率越小,聚合物在岩石表面的吸附量越大。因此,推荐黄原胶用于高矿化度、高温油藏堵水。
Oil wells to shut down water or reduce oil production wells is the oil industry must solve the problem. Polymer flooding can reduce the reservoir’s water-phase permeability and, moreover, reduce the heterogeneity of the reservoir due to polymer adsorption on the rock surface. Two types of polymers, polyacrylamide (PAA) and glycans (xanthan gum), were investigated and the viscosities of the two polymer solutions under different salinities, shear rates and concentrations were evaluated. The prepared polymer solution is first injected into the core in order to evaluate the adsorption of the polymer on the rock surface by calculating the drag coefficient and the residual drag coefficient. In addition, the effect of polymer solution injection rate was further studied. The results showed that the xanthan gum solution has high salt tolerance (20%), while PAA is very sensitive to salt; It was also found that the smaller the injection rate, the greater the polymer adsorption on the rock surface. Therefore, xanthan gum is recommended for high salinity, high temperature reservoir plugging.