关键词: 低渗油藏, 　注水开发, 　高含水, 　优化调整

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