零维煤层气模拟软件的研制

A TANK-TYPE SIMULATOR FOR COAL-BED METHANE PRODUCTION

提出了煤层气井水产量的拟压力解公式、气水产能比公式，得出气水两相双直线段式的相渗规律．在此基础上，结合J．P．Seidle等人提出的煤层气井气产量拟压力解公式，根据物质平衡原理，研制出了一个零维的煤层气藏模拟软件，并作了实例模拟与分析．该软件在煤成气井的整个开采期内都适用．应用此软件可对煤层气井的生产进行预测，以此制定合理的开发方案和决策意见，也可据此快速评价各种增产措施、井底压力和其它作业条件的影响，从而优化煤层气的开采．对此模型稍作修改后可完全适用于干煤层气井的参数预测．

This paper presents new equations for calculating water preduction and ratio of gas and water in coal-bed methane well. A bilinear relation of gas and water permeability is proposed. These procedures are useful for the investigation of coal-bed methane production pertofmance. By using the quasi-pressure in gas production equation proposed by J. P. Seidle, a tank-type simulator is developed according to the material balance principle. The validity of this simulator is verified by analysis of a practical example. The results showed that the simulator is effective in use. With only a few modifications, this simulator will be completely fit for a coal reservoir without initial water.