无机盐与聚丙烯酰胺对废正电胶钻井液脱稳协同作用的选择性

Selectivity of synergistic effect between inorganic salts and polyacrymides on destabilization of waste MMH drilling fluid.

作为废钻井液的无害化处理研究的一部分 ,报道了正电胶钻井液的化学脱稳处理试验结果 ,讨论了无机盐与聚丙烯酰胺对正电胶钻井液的协同脱稳效应的选择性。实验表明 ,正电胶钻井液非常稳定 ;它的离心脱水效果受化学脱稳处理所使用的无机盐的类型、聚丙烯酰胺的类型及电性、加药顺序等因素制约。与通常对聚合物钻井液进行化学脱水处理时采用的加药顺序不同 ,先用弱阳离子性的聚丙烯酰胺MPAM处理正电胶钻井液时 ,能获得较好的离心脱水效果。推荐将MPAM与FeSO4·7H2 O结合使用于正电胶钻井液的脱稳处理 ,同时讨论了它们的特性对脱稳机理的可能影响。

As a part of innocuous treatment study of waste drilling fluid, chemical destabilization of MMH drilling fluid was reported and the selectivity of synergetic destabilization effect between inorganic salts and polyacrylamides on the fluid was also discussed. The results revealed that MMH drilling fluids are very stable. Centrifugal dewatering efficiency of the fluids are controlled by the following treatment conditions: varying inorganic salt, polymer and its charge character, and the dosing sequence. In contrast to the reagents adding sequence, which was commonly adopted by chemical dewatering of waste polymer fluids, a better centrifugal dewaterability was observed when pre conditioning waste MMH fluid with weak cationic polyelectrolyte MPAM. Combined utilizing of MPAM and ferrous sulfate (FeSO 4·7H 2O) in the drilling fluids was recommended, and influences of their characteristics on destabilization mechanism were proposed.