用聚丙烯酸钙改善KHm-FCLS-CMC钻井液的性能

KHm-FCLS-CMC 钻井液(HFC)是一种在川东地区体罗系地层使用的防塌泥浆,这种泥浆悬浮、携带钻屑的能力强,但密度易升高,粘切大,性能不稳定,因而需频繁进行化学稀释处理。将聚丙烯酸钙 CPA 引入 KFC 钻井液中,泥浆性能和钻井效果得到明显改善。笔者从川东侏罗系的地质特点出发,介绍了 KFC 钻井液的组分特点和引入 CPA 的依据、目的,提出了现场应用工艺。     

Fouling mitigation in the repeated batch runs of electrodialysis with humate foulant

Since membrane fouling is one of the important considerations in electrodialysis, many approaches have been considered in order to minimize fouling of the process. In this study, square wave powers having pulsing effects were employed to investigate the effects of the frequencies on the fouling mitigation during fouling experiments of humate, forming a loosely packed fouling layer on the anion exchange membrane surface. It was shown that a pulsing electric field with determined optimal frequency reduced the fouling potential of an already fouled system in repeated batch runs at a significant level. It was suggested through electrodialysis experiments of humate that the pulsation of the electric field affected the electromigration of the charged particles deposited in the fouling layer, thus decreasing fouling potentials.