Abstract: Fengfuchuan Oilfield is a ultra⁃low permeability reservoir, pilot experiment of pre⁃water injection in Chang 2 reservoir began in 2002. In 2003, the development of water injection in the whole area was basically realized. However, the development effect of the whole area was not ideal. The comprehensive water content increased from 25.0% in the initial period to 92.0% in 2015, and entered the stage of ultra⁃high water cut period.The main problems faced in this area are that the phenomenon of fractured water flooding and water channeling is more serious, the water content of the oil well rises obviously, the output of a single well is low, and the output of the oil field decreases rapidly. In this paper, the geological of the whole area was recognized again. On the basis of fine comparison of single sand bodies, improvement of injection⁃production well nets and improvement of the corresponding degree of small⁃layers, the first one was to propose a large⁃area water injection on the whole area, a partial slow and gentle water injection to supplement the stratigraphic energy; the second one was to adopt two sets of injection⁃production patterns to realize stratified injection, expanded the original well spacing, and solved the inter⁃layer contradiction; the third one was to improve the single well production efficiency and improved the single well production to improve the development of the whole area.

Key words: Low permeability reservoir, Waterflooding, High water cut, Optimization and adjustment

摘要： 丰富川油田为低渗透油藏，2002年开始对长2油藏进行前期注水先导实验，2003年基本实现全区注水开发，但全区开发效果不理想。综合含水率由2003年的25.0%上升到2015年的92.0%，进入超高含水开发阶段。该区主要面临的问题是裂缝性水淹水窜现象较为严重，油井含水率上升明显，单井产量低，油田产量递减快等。对全区进行了地质再认识，在对单砂体精细对比、完善注采井网、提高小层对应程度的基础上，一是提出了整体上大面积注水，局部上缓慢温和注水的注水方式，以补充地层能量；二是提出了采用两套井网，实现分层开采的方法，以扩大原始井距，解决层间矛盾；三是采取单井引效措施，以提高单井产量，最终改善全区开发效果。

关键词: 低渗油藏, 　注水开发, 　高含水, 　优化调整