试论煤储层气-水两相流系统

根据3种煤层气运移边界类型与7种煤层重力水运移边界类型的组合形式，将煤储层气-水两相流系统划分为3种基本类型，并结合具体实例探讨了不同类型与煤层气产出潜势之间的关系。研究表明，开放型系统中的煤层气和地下水具有运移显著且交替活跃特征，煤层气井产能必然相对较低；半开放型系统的边界条件较为复杂，导致煤储层含气性、煤层气产出潜势变化较大；封闭型系统具有地下水滞流及煤层气被封闭的基本特征，极有利于煤层气的富集高产。

Double-phase liquid system of gas-water in coal reservoir

Based upon the composite patterns from three coalbed gas boundary types and seven coalbed gravity water types,the double phase liquid system of the gas water in coal reservoir is subdivided into three fundamental models,i.e.the open,semi open and close those,and the correlation of the models to the coalbed gas production potential is discussed in combination with some cases.The coalbed gas production potential may be relatively low in the open system because the coalbed gas and underground water in the system is active,be various in the semi open system because of the complex boundary conditions,and be relatively high in the close system in which the coal gas is sealed from the underground water.