注气开采煤层气增产机制的研究

摘要

依据扩散渗流和多组分吸附平衡理论，研究了注气开采煤层气的增产机制.研究表明，注气增加储层能量，提高储层压力传导系数并产生竞争吸附置换效应，从而提高煤层气开采时的单产量及回收率.文中还导出了注气时回收率的计算公式.所得结论对注气开采煤层气设计和评价具有指导意义.%According to theory of diffusion and permeation,and theory of adsorpt ion equilibrium of commixture gas，the mechanism of increasing coalbed methane production by gas injection is studied, with which it is illustrated for enhancing energy of storing gas stratum, heightening pressure conduction coefficient of storing gas stratum and binging domino effect of competition adsorption by gas injection, consequently yield and ratio of recovery of coal bed methane are also enhanced. The rncalculation formulas of ratio of recovery are deduced. These conclusions have guidance significance to exploitation coalbed methane by gas injection.