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

摘要： 渤海湾海上常规稠油砂岩油藏,储层非均质性严重、胶结疏松,长期注水开发,储层的平面和纵向非均质性加剧,导致油田开发过程中含水上升快、产量递减快等问题出现。调驱技术作为一项改善中高含水油田开发效果、控水稳油、实现油藏稳产的重要技术措施得到广泛应用。针对海上油田开发过程中存在的问题,中国海油开展了各种调剖、堵水、深部调驱等技术研究与应用。文章主要介绍了弱凝胶调驱、冻胶深部调驱、纳米微球调驱、氮气泡沫压锥、改性稠油堵水等调剖技术的技术原理和应用情况。应用这些技术与工艺,取得了较好的增油控水效果,为油田中高含水开发提供了技术保障。

关键词: 海上油田, 调驱技术, 弱凝胶, 冻胶, 纳米, 泡沫, 堵水