Electro-Sorption Treatment Method for Waste High Performance Water-Based Drilling Fluid

With the higher and higher environmental protection requirements for shale gas exploration and development, high-performance water-based drilling fluids have been gradually popularized in the drilling process. However,waste drilling fluid is still produced in a large amount. In order to improve the recycling efficiency of water-based drilling fluid, features of waste high-performance water-based drilling fluid, such as high content of total solid phase and micro poor solid phase, were analyzed, during which it was proposed to remove the poor solid phase in waste high-performance drilling fluid by the electro-sorption method, which had the advantages of having no addition of chemical agents, a selective removal of micro pore solid phase and no damage to the original effective components of drilling fluid. The experimental results showed that after taking the electro-sorption treatment process for two times, the ultra-fine and inferior solid phases of less than 10 μm in the waste high-performance water-based drilling fluid could be removed. Further, with the combination of electro-sorption method and centrifugal separation pretreatment, the performance of regenerated drilling fluid could be significantly improved, thus realizing the recycling of drilling fluid. The results obtained showed that the electro-absorption treatment of waste high-performance water-based drilling fluid constituted a new resource-based model for drilling fluid consumption reduction and reuse, which showed good potential for popularization and application.