影响煤层气井产能因素的初步研究

A Primary Study of Factors Influencing Coalbed Gas Productivity

根据煤层气动态模型，提出了煤层中气、水渗流的数学描述及相应的求解方法。运用这一方法对影响煤层气生产的因素及其敏感性进行了研究。在各影响因素中，渗透率、供给半径对煤层气井水产量的影响较大；兰格缪尔体积常数、渗透率、供给半径和井底流压对煤层气井气产量影响较大，对煤层的平均压力也有一定影响，其中以供给半径的影响最大。

In this paper a methematical model descriping the production performance of coalbed gas well is developed. Basing on this model a series of factors influencing well production and their sensitivities are analysed. Permeability and delivery radius have more influence on water production of coalbed gas wellLangmuir constant, bottom hole pressure and delivery radius have more influence on gas production of coalbed gas well. The influence of delivery radius is the most among all factors.