关键词: 海上油田, 调驱技术, 弱凝胶, 冻胶, 纳米, 泡沫, 堵水

Abstract: The offshore sandstone reservoirs of conventional heavy oil in Bohai Bay are strong in heterogeneity and loose in cementation. Long-term water-injecting development has intensified horizontal and vertical heterogeneity of reservoirs, leading to rapid increase of water cut and gradual decrease of production in the oilfield development process. Flooding technology is an important technological process to improve development results of high water-cut oilfields and control water cut for stable oil production. It finds wide application in oilfields. To settle the issues existing in offshore oilfield development, CNOOC has focused on the study and application of various technologies for profile control, water plugging and deep-layer flooding. This article makes briefings about the principles and application of flooding technology, such as weak gel flooding, jelly deep-layer flooding, nanosphere flooding, nitrogen foam pressure cone, and modified heavy oil water plugging. Application of the technology and process has achieved good results for increase of oil production and water-cut control, technologically ensuring high water-cut oilfield development.

Key words: offshore oilfields, flooding technology, weak gel, jell, nano, foam, water plugging