浅论气水在低渗砂岩中的相对渗透率方程

Gas and water relative permeability equation in low permeability sandstones

陆辉 谢丽 乐涛涛

1. 长江大学石油工程学院，湖北 荆州 434023; 2. 长江大学地球物理与石油资源学院，湖北 荆州 434023

PetroleumEngineering College, Yangtze University, Jingzhou 434023, China

低渗气藏的开发是我国气藏开发所面临的一个技术挑战。由于其自身低孔低渗的特点，所以渗流机理与普通气藏有很大不同。针对渗透率低于1×10-3 ?滋m2的天然低渗透砂岩，建立了一系列相对渗透率数学模型，并且对影响气水相对渗透率的一些机理进行了初步的探讨，最终得出新的气水相对渗透率方程，并在此基础上对临界水饱和度和“束缚”水饱和度之间的关系提出了不同的见解。本研究对类似气藏的开发具有重要的理论意义。

It is a technical challenge to develop low permeability reservoir in China. For the characteristics of low porosity and low permeability itself, it has different transfusion mechanism from conventional gas reservoirs. Aimed at gas percolation in sandstone cores with permeability lower than 1×10^-3μm2, a series of mathematic model are founded to investigate some factors affecting percolation in low permeability reservoirs. At last, a new gas and water relative permeability equation is drawn out, and on this basis, new opinion has been put forward for the relation between critical water saturation and near "irreducible" water saturation. This is of significant importance to the development of such type of reservoirs.