• 责任者：Zhang Yan (College of Petroleum Engineering ; China University of Petroleum ; Beijing 102249 ; China) ; Xiang Xingjin
• 刊名：Petroleum Exploration and Development
• 出版年：2011
• 卷期：38(4)
• 关键词：钻井液 ; drilling fluid ; 井壁稳定 ; wellbore stability
• 页码：p.490-494
• 图表：6 illus., 5 tables, 18 refs.
• 分类号：2000
• issnNo：ISSN1000-0747
• isbnNo：CN11-2360/TE

Through research on the flowing state of free water in drilling fluids, a special complexing agent was developed. This additive can increase the capillary force for free water to invade reservoirs and thus control filtrate invasion by effectively complexing the free water in drilling fluids. The invasion quantity and invasion depth of water into reservoirs can be reduced.  Based on the results of CST tests, spontaneous water imbibition test of cores and measurement of free water content, it is concluded that the newly formulated drilling fluid with less free water can effectively complex free water in drilling fluids and reduce liquid invasion to formations. Field application shows that the less free water drilling fluid has good behaviors of rheology, lubricity and inhibition. It can increase the bearing capability of the formation, decrease the required density of drilling fluid, and shorten the drilling time.