关键词: 入井流体, 地质特征, 产油层, 相容性, 评价方法, 设计依据

Abstract: This paper introduces systematically formation damage in Liaohe Oilfield by drilling fluids and some completion fluids(referred as "in-well fluid" in this paper)based on simulation tests, SEM and ES test as well as field practice of more than 800 wells in nine producing test areas. It points out the source and characteristics of damage, summarizes the reason, regularity and degree of damage of some fluids, set up method of analysis by poly-item tests data and the tendency correlation and puts forward three new concepts and three technologies with the compatibility of the in-well fluid to the reservoir formation as a centre. All these are meaningful to prevent, or minimize, the formation damage of the in-well fluids.