裂缝性低渗透油藏渗流规律实验研究

对某油田断块含天然裂缝的低渗透储层渗流特征进行了实验研究。本实验在常规渗流实验岩心夹持器末端增加了一套回压控制装置，渗流实验过程中，通过给岩心施加不同的回压，模拟了储层在变压条件下的流体渗流情况。得到了裂缝性低渗透储层岩心水相渗透率随回压的变化曲线。实验结果表明，裂缝的存在对低渗透储层的渗流特征有明显的改造，裂缝开启前，储层渗流可以看作是基质岩石渗流，裂缝对渗流的影响不大;裂缝开启后，由于其渗流能力较强，将发挥主要的渗流通道作用。

Experimental study on seepage flow law of fractured low permeability reservoir

The seepage flow characteristics of a typical fractured low permeability reservoir were studied by experiments. The conventional seepage flow experimental equipment was reformed by additional back-pressure controlling system in the end of core holder, The seepage flow characteristics of this block were simulated by exerting different back-pressure for core. The relation curves of water phase permeability of reservoir cores and back-pressure were obtained. The results show that the existing of fractures has influence on percolation flow characteristics of low permeability reservoir. Before fractures open, the fluid flow in reservoir can be thought as fluid flow in matrix, and the effect of fractures on fluid flow is less. After fractures open, the fractures are the main fluid flow channel.