低渗储层中气体非达西渗流机理

通过对低渗透岩心气体的渗流实验研究,探讨了低渗透储层气体渗流机理。结果表明:在低渗透储层中,气体渗流表现出明显的非达西渗流特征,并且受含水率的影响较大;在渗流克氏回归曲线上,存在两个临界点a、b,均具有重要的意义:小临界点a区分了两种不同的作用机理,其位置的不同对应的渗流曲线类型不同;临界点b界定了两种不同的渗流形态,临界点b的位置高低对应的渗流曲线中非线性渗流段的长短就不同。两个临界点的研究对理论分析以及现场生产均具有重要的指导意义。

Mechanism of gas non-darcy flow in low permeability reservoirs

The experiment and mechanism of gas flow in the low permeability reservoirs is studied.The result indicates:the non-darcy characteristic of gas flow displays obviously in the low permeability reservoirs,specially under the effect of moisture content.The critical point a and b in the seepage klinkenberg regression curve exist and have vital significance.The two different seepage mechanisms are discriminated by the critical point a and the type of seepage curve are determined by position of the critical point a;the two different seepage types is chosen by the critical point b,the length of nonlinear seepage curve is determined by position of the critical point b.Two critical-point research has important significance to the theoretical analysis as well as to the exploitation.