废弃高性能水基钻井液循环利用电吸附处理方法

随着页岩气勘探开发环保要求的提高，钻井过程中逐步推广应用高性能水基钻井液，但仍产生大量的废弃钻井液。为了提高水基钻井液的循环利用率，分析了废弃高性能水基钻井液的总固相含量和微小劣质固相含量，提出了去除废弃高性能水基钻井液中劣质固相的电吸附处理方法，具有不添加化学药剂、选择性去除微小劣质固相和不破坏钻井液中原有有效成分等优点。试验结果表明，废弃高性能水基钻井液经过2次电吸附工艺处理后，能够去除粒径小于10 μm的超细微劣质固相；电吸附结合离心分离预处理方法能够显著提升高性能水基钻井液的再生性能，实现钻井液循环利用。研究结果表明，利用电吸附法处理废弃高性能水基钻井液，是废弃钻井液减量化和资源化处理新模式，具有较好的推广应用前景。 

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.