地质科技情报2012，Vol.31Issue(1)：122-126,5.
不同剪切作用下CMC水溶液的微观结构研究
Microstructure Research of CMC Solution at the Different Shearing Action
摘要
Abstract
The dissociation of hydrates on the sidewall and the dissociation or reformation of hydrates in an-nulus can cause some hole problems, such as the change of properties of drilling fluids, blocking in annular and wellbore collapse, which have a direct influence on drilling operation. With the influence of flow shearing action, the microstructures of drilling fluids have played an important role in the process. The drilling fluids microstructures are very complex, but sodium carboxy methyl cellulose(CMC) is only researched as one of the most important components of the polymer drilling fluids. Considering the different shearing action on the drills and in annulus, the rheological properties of CMC solution are tested at the different corresponding shearing action(600 r/min and 6 000 r/min respectively). Using the freeze-drying method and scanning electron microscopy, the corresponding microstructures of the CMC solution are observed after the two kinds of shearing action. Results show high-speed shearing action can change and even destroy the net framework structures of CMC solution, then the viscosity of solution decreases. Thus, heat and mass around the drilling cuttings can transfer more easily to the surface of the drilling cuttings through the net framework and the micro molecules in the form of heat conduction and convection heat transfer, and lead to the hydrates dissociation. Gas and water that the hydrates decomposition produced transfer to outward and inward in the form of molecular diffusion, but mass transfer is blocked by the drilling micro-skeleton structure and the obstacles of implants.Mass transfer关键词
剪切速率/CMC水溶液/微观结构/扫描电子显微镜/水合物/传热传质Key words
shearing rate/CMC solution/microstructure/scanning electron microscope/hydrate/heat and分类
地质学引用本文复制引用
韩博,张凌,蒋国盛,宁伏龙,刘力,范勇,胡代平,辜幕丹..不同剪切作用下CMC水溶液的微观结构研究[J].地质科技情报,2012,31(1):122-126,5.基金项目
国家自然科学基金项目(50904053) （50904053）
中央高校基本科研业务费专项资金项目(CUGL090217) （CUGL090217）
科学钻探国家专业实验室开放课题资助项目(NLSD200901) （NLSD200901）
