水基钻屑固液分离室内实验研究

Indoor Experimental Study on Solid-Liquid Separation of Water-Based Drilling Cuttings

水基钻屑结构复杂且会对环境造成巨大危害,研究如何高效处理水基钻屑具有重要意义。目前关于钻屑固液分离方式的实验研究仍然较为缺乏,因此针对水基钻屑固液分离方式中最主要的离心、过滤,开展了离心实验、多孔介质过滤实验、膜过滤实验,实验主要通过对比不同参数情况下分离后固相含固率、液相密度、液相浊度判断水基钻屑固液分离的好坏。离心实验最终优选絮凝剂(聚合硫酸铁)最佳投加量为20 g/L,离心机转速2000 r/min;多孔介质过滤实验优选的多孔介质为石英砂;膜过滤实验优选的超滤膜为聚砜膜。实验所获结果,可用于指导现场药剂投加、离心机转速设置、最终液相过滤回用等。

The structure of water-based drilling cuttings is complex and can cause significant environmental harm.Research on efficient treatment methods for water-based drilling cuttings is of paramount importance.However,there is still a lack of experimental research on drilling cuttings solid-liquid separation methods.Therefore,focusing on the most common solid-liquid separation methods in water-based drilling cuttings,namely centrifugation and filtration,centrifuge experiments,porous medium filtration experiments,and membrane filtration experiments were conducted.The experiments primarily assessed the effectiveness of solid-liquid separation in water-based drilling cuttings by comparing the solid phase content,liquid phase density,and liquid phase turbidity under different parameter conditions.In the centrifuge experiments,the optimal dosage of flocculant(polymeric ferric sulfate)was determined to be 20g·L-1,with a centrifuge speed of 2000rpm.The preferred porous medium identified in the porous medium filtration experiments was quartz sand.In the membrane filtration experiments,the preferred ultrafiltration membrane was polysulfone membrane(PSF).The results obtained from the experiments can be used to guide on-site dosage of chemicals,centrifuge speed settings,and reuse of the filtered liquid phase.