废弃钻井完井液固液分离技术研究进展

Research Progresses on the Separation of Solids and Liquid in Waste Drilling and Completion Fluids

固液分离技术是废弃钻井完井液治理的关键技术之一。固液分离的效率和效果主要取决于对废弃钻井完井液体系的胶体稳定性的破坏,这是由絮凝剂、助凝剂、废液稀释比和絮凝动力学等因素共同作用的结果。为实现废弃钻井完井液固液分离工艺在现场的实施,国内外开发了多种组合式技术和装备,采用混凝、沉淀、气浮、过滤、氧化等单元联合处理,已经可以经济地处理废弃钻井完井液。

The solid-liquid separation is a key technology in the waste drilling/completion fluids treatment.The efficiency and the effects of the solid-liquid separation are dependent on the extent to which the colloid structure of the waste drilling/completion fluids is destroyed,and is the product of the synergetic effect of primary flocculants,secondary flocculants,the dilution ratio of the waste fluids and flocculation dynamics.Technologies and equipment was developed abroad for the separation of solid-liquid separation of the waste drilling/completion fluids.Using compound flocculation,precipitation,gas/air suspension,filtration and oxidization technologies,the solid-liquid separation became feasible and economical.