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针对梁11断块地层压力低及水窜严重的矛盾,通过油井流入动态方程的建立,流入动态曲线特征分析,确定了断块不同含水率下的最低允许流压值;根据现场资料,回归分析了含水率与采油速度、注采比关系,得出断块合理的采油速度应保持在0.8%以上,合理的注采比为0.8。基于上述结果,通过注采系统压力平衡图分析,指出断块目前存在的主要问题为注采井网不完善,注采比低。为高含水期注采调整,改善开发效果提供了依据。
Aiming at the contradiction between low formation pressure and serious water channeling in Liang 11 fault block, the minimum allowable flow pressure value under different moisture content of the block was determined through the establishment of the dynamic equation of inflow of oil well and the characteristic curve of inflow dynamic curve. According to the field data, The relationship between moisture content and oil recovery rate and injection-production ratio shows that a reasonable oil recovery rate should be maintained above 0.8% and a reasonable injection-production ratio is 0.8. Based on the above results, through the analysis of pressure balance diagram of injection-production system, it is pointed out that the main problems existing in the block are the imperfect well pattern and the low injection-production ratio. It provides the basis for adjustment of injection and production in high water cut period and improvement of development effect.