加重钻井液防重晶石沉降技术  

Study on Prevention of Barite Sedimentation in Weighted Drilling Fluids

作　　者：林枫 由福昌 王胜翔 杨培龙 

机构地区：[1]中国海油伊拉克有限公司 [2]荆州嘉华科技有限公司

出　　处：《钻井液与完井液》2015年第3期27-29,104-105,共3页Drilling Fluid & Completion Fluid

摘　　要：重晶石沉降往往发生在钻井过程中,而在静置过程中由于钻井液凝胶强度的存在,沉降稳定性较好,而一直以来忽视了动态沉降问题。基于以上问题,提出采用老化罐静态沉降测试法和黏度计动态沉降测试法(改进VST法)来综合评价重晶石的沉降情况。并将重晶石的粒径与沉降稳定性的测试方法相结合,寻求出一种重晶石防沉降技术。实验结果表明:在常规重晶石中复配一定量的超细重晶石,能够较大程度地改善重晶石沉降的问题,尤其是重晶石的动态沉降问题,动态密度差由单一常规重晶石加重情况下的0.436 g/cm3下降为0.011 g/cm3,解决了重晶石沉降问题。Settling of barite has long been a problem in deviated well and extended reach well drilling. A cost effective method for preventing barite settling is developed by combining the methods for barite particle size measurement and sedimentation stability testing. Experiments showed that by adding a certain amount of ultra-fine barite into commonly used drilling fluid barite improved the sedimentation stability, especially the dynamic sedimentation, of the barite, the dynamic density difference decreased from 0.436g/cm3 for conventional barite only, to 0.011 g/cm3 for the mixed barite, greatly improving the sedimentation stability of barite.

关 键 词：加重钻井液 重晶石 动态沉降 超细重晶石 

分 类 号：TE254.3[石油与天然气工程—油气井工程]