中、高煤阶对煤层气采收率的影响

Influence of medium and high coal rank on coalbed methane recovery ratio

为揭示煤层气开发过程中煤阶对采收率的影响作用,利用煤层气的成因与赋存理论,通过对前人研究的总结,结合沁水盆地煤层气井实际开采数据,对煤阶与采收率的关系进行分析.研究结果表明:中、高煤阶通过孔隙率、含气性、解吸率等几个方面对煤层气采收率产生影响,孔隙率越大、含气性越高、解吸率越大,采收率就越高.该研究成果对产能预测、可采性分析有一定的帮助.

To reveal the effect of coal rank on recovery ratio during the coalbed methane exploitation process, this paper analyzed the relationship between coal rank and recovery ratio, and revealed that there are some regularity changes among coal rank and porosity, gas .storage properties, desorption rates in medium and high rank coal reservoirs. This study was based the theory of the origin and occurrence of coalbed methane, the previous studies, and combining with the actual drilling data of Qinshui basin coalbed methane wells. The results show that, the medium and high coal rank on recovery ratio is mainly affected by porosity, gas storage properties and desorption rates. The greater the value of porosity, gas storage properties and desorption rates, the higher the recovery ratio. The conclusion of this study has shed some light on the productivity and workability analysis.