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在长期的注水开发过程中,随着注入倍数的增加,储层的孔隙结构和物性参数均发生了较大的变化,油层的渗透率较开发初期有了较大提高,注入水沿大孔道或高渗透段窜流严重,水驱油效率较低。进入特高含水开发期以来,随着采出程度的增加和油藏水淹程度加剧,平面上剩余油分布更加零散,措施挖潜的余地小、难度大、产量递减快等突出矛盾严重制约着开发效益的提高。在卫95块开展以油藏流体流向控制技术为主导技术的区块深部液流转向先导实验,对改善水驱开发效果,减缓递减,实现油田持续稳产,提高采收率及卫95块油藏开发效果,达到稳油控水的目的,并为下一步在该区块及类似特高含水油藏区块开展此项工作提供新的思路和方法。
During the long-term waterflooding development, the pore structure and physical parameters of reservoirs have changed greatly with the increase of injection multiple, and the permeability of reservoirs has greatly increased compared with the initial stage of development. The injection of water along large channels or Severe channeling of high permeability section, low water flooding efficiency. Since the development of the ultra-high water-cut period, with the increase of the degree of production and the increase of reservoir flooding, the distribution of remaining oil in the plane becomes more and more scattered, and the potential for potential tapping potential is small, the difficulty is large and the output decreases rapidly, which seriously restricts the development Benefit increase. In the Wei 95 block to carry out the reservoir fluid flow control technology as the leading technology in the block deep flow steering pilot experiment to improve the water flooding development effect, slow down, to achieve sustained and stable oil production and improve oil recovery and Wei 95 reservoir Development effect, to achieve the purpose of stabilizing oil control water, and provide new ideas and methods for the next step in the block and similar ultra-high water-cut reservoir blocks to carry out this work.