寿阳区块15号煤高温吸附特征及其煤层气开发意义

寿阳区块15号煤的煤层气资源量可观,但部分区域含气饱和度不到70％.对部分煤芯样品进行高温吸附实验发现,在煤层压力和含气量不变的情况下,本地区的15号煤只要温度超过36.5℃即可使含气饱和度升高超过100％而解吸产出,高温解吸附特性非常明显.但根据热平衡计算,单独采用升温解吸工艺进行煤层气开发没有经济性.根据研究区的煤...

Characteristics of High-isothermal Adsorption and Development Significance of Coalbed Methane of No.15 Coal Seam in Shouyang Block

The coalbed methane resource of No. 15 Coal Seam is considerable in Shouyang Block, but the gas saturation is lower than 70%. According to the results of high temperature isothermal adsorption tests, the gas saturation of No. 15 Coal Seam will growth to 100% at the temperature of 36.5℃ while coalbed methane could be desorbed, and it shows the available characteristics of high temperature. However, through the calculation of heat balance, there is no economic value for coalbed methane development only using the technology of temperature desorption in this area. According to the characteristics of coalbed methane resources and high temperature isothermal adsorption, this paper proposes an auxiliary drainage method by heating up temperature, controlling the critical desorption pressure always lower than the BHP and declining with it synchronously, and stopping the heating when the BHP is lower the critical desorption pressure of normal temperature and change to drainage and pressure reduction.