胶体化泥浆化学固液的分离

Separation for chemical solid-liquid of drilling slurry

为解决废弃钻井泥浆固-液两相难分离的问题,利用具有高黏度的高分子凝聚剂对泥浆体系进行胶体化处理,使泥浆由流体转化为冻状胶态,通过化学胶体的破胶与聚沉作用、酸化破胶及无机助凝的过程,实现废弃泥浆的固液分离.通过场发射扫描电子显微镜对泥饼的表面形貌进行了分析.结果表明:泥浆分离效果由凝聚剂、酸化剂以及助凝剂的类型与投加量决定,当有机成胶剂为A-PA、破胶剂为H20、无机助凝剂为Ca(OH)2,且投加量分别为0.375 g、0.5 g和15.0 g时,钻井泥浆固液分离效果最好,泥饼的固相质量分数(固含量)由44.5%提高到80.5%.

To solve difficult separation problem of the solid-liquid two-phase waste drilling mud, the slurry system was converted to colloid from fluid with the colloidization of high polymer coagulants with high viscosity. The solid- liquid separation of the waste slurry was realized by the process of chemical colloidal gel breaking, coagulation function, acidification gelout and inorganic coagulation. In addition, the surface morphology of slurry cake was investigated by using Field emission scanning electron microscope （FE-SEM）. The results indicate that mud separation effect is decided on the type of flocculants, gel breaker and coagulant aid. The solid content of mud cake increases from 44.5% to 80.5% when A-PA, H20 and Ca（OH）2 are employed as the flocculants, gel breaker and coagulant added with the dosage of 0.375 g, 0.5 g and 15.0 g respectively.