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水玻璃复合堵水剂是一种有别于水玻璃—氯化钙的改性堵剂。它既保留了水玻璃—氯化钙强度大、货广价廉、热稳定性好等优点,同时还具有粘度低、可泵性好、成胶时间长、可堵可解的特性,因此是一种较为理想的封堵材料。它适用于砂岩地层的非选择性堵水,诸如封堵窜槽水及单一水层;而对渗透率差异大、且有未动用层的油井,利用其流动性好之特点,也可以达到选择性堵水的目的。本文就水玻璃复合堵水剂的性能、影响因素、基本配方及试验效果等,进行了综述与评价。
Water glass composite plugging agent is a water glass - calcium chloride modified plugging agent. It not only retains the advantages of sodium silicate-calcium chloride such as high strength, high cost and good thermal stability, but also has the characteristics of low viscosity, good pumpability, long gel time, A more ideal plugging material. It is suitable for non-selective water shut-off of sandstone formations, such as sealing of channeling water and single water layer. For oil wells with large differences in permeability and unused layer, the well can be selected according to its good fluidity Sexual plugging purposes. In this paper, the performance, influencing factors, basic formula and test results of water glass composite plugging agent were reviewed and evaluated.