喇嘛甸气顶油藏隔障开采效果实验研究

Laboratory experiment of barrier injection flooding for Lamadian gas cap reservoir.

气窜对于气顶油气藏的开发效果存在较大影响,因此气顶油气藏的开发关键在于防止气窜、保持油气界面的相对稳定。针对喇嘛甸油田层状气顶的实际情况,利用物理模拟实验方法,研究了水、聚合物和凝胶等3种不同类型流体作为隔障对喇嘛甸气顶油藏开发效果的影响。试验结果表明,对于同一种阻隔剂,隔障体积越小、气顶压力越大以及采油速度越大都会减弱隔障效果;对比不同隔障剂实验结果发现聚合物凝胶是最佳的隔障流体;如果对含气顶的油层进行注水开发,将会降低隔障中聚合物等高分子化学剂的浓度,引起隔障阻隔能力的下降。

Gas breakthrough has significant affect on gas cap reservoir,so it is important to avoid gas breakthrough and keep steady of gas/oil interface during developing.On the base of actual conditions of Lamadian oil field,using the simulation experiment method,the development effects of Lamadian reservoir were studied when water,polymer and polymer gel are regarded as barrier fluid respectively.The experiment shows that the factor which influence development effects of barrier water flooding include the size of slug,the pressure of gas cap and recovery rate of oil.If develop gas cap reservoir by inject water will decline concentration of polymer and cause the decrease of barrier capacity.On the bases of analyzing these influence factor,it point out that polymer gel is the best barrier fluid.