Formation damage caused by drilling and perforation is a major factor that reduces reservoir productivity. Someresults on this subject achieved abroad in recent years are summarized in this paper.

• 油气层在钻井和射孔过程中所受到的损害是影响油气层原始产油率的主要因素。本文介绍了近年来国外在这方面的一些研究成果。