姬源油田Y214区提高注水开发效果对策研究及应用

Research and Application of Countermeasures of Improving Waterflooding Effects in Well Y214 District of Jiyuan Oilfield

姬塬油田Y214区长4＋5、长6油藏为特低渗透岩性油藏，开发层系多，储层物性差，非均质强。注水开发中平面、层内、层间矛盾突出，水驱储量动用程度低，递减大。针对开发过程中所暴露的主要矛盾，以精细地质研究结合油藏动态细分注水单元，采用理论计算与矿场统计的方法确定分单元技术政策，实施精细注采调整；针对层内、层间矛盾突出井实施精细分层注水，有效缓解了开发矛盾，开发效果明显好转。

Chang4＋5, Chang6 reservoirs in Y214 area of Jiyuan Oilfield arc extra-low permeability lithologic reservoirs with the characteristics of multiple developed zones, poor physical properties and high heterogeneity. In water drive development, the contradictions on the plane, inside the layer and between layers are significant, the recovery degree of water driven reserves is low and production decline is great. In response to the main contradictions exposed during development, the water injection units are finely divided through detailed geological research combined with reservoir dynamic analysis, unit-specific technical measures are deter- mined by the method of theoretical calculations and field statistics, and refined injection and production adjustments are implemented. For the wells with outstanding intra-layer and interlay contradictions, layered water injection is applied, the contradictions have been effectively reduced and the development results have been apparently improved.