摘要
为了探索煤岩中水分含量对渗透率的影响,对我国北方某煤层气区块3号和15号煤层的原煤煤样进行了实验。结果表明:在相同条件下,干燥煤样、3%水分含量煤样及6%水分含量煤样这3种煤样的渗透率均随孔隙压力的增大而先减小后增大,大致呈"抛物线"变化;干燥煤样的渗透率明显高于含水煤样的渗透率;随着水分含量的增加,煤样渗透率下降。在实验和前人研究的基础上,利用不同水分含量煤样的实验数据进行了对比分析,并建立了考虑水分含量煤岩收缩/膨胀的渗透率模型,最后运用实例,将模型预测结果与现场试井渗透率数据进行了对比分析,其相对误差不大。该研究成果对煤层气开采具有一定的指导意义。
In order to explore the influence of moisture content in coal rock on permeability, this paper made experiments on raw coal samples in a northern coal-bed methane blocks of No. 3 and No. 15 coal bed. The results show that: under the same conditions, the permeability of three kinds of coal rock of dried coal samples, 3% moisture content coal samples and 6% moisture content coal samples first decreases and then increases with the increase of pore pressure, roughly displays 'parabola' change. The permeability of dried coal samples is significantly higher than that of moisture content coal samples. With the increase of moisture content, permeability of coal samples decreased. On the basis of experiments and previous studies, using comparative analysis method on experimental data of the coal samples with different moisture content, we modified the Langmuir isothermal equation and set up a permeability model considering the moisture content and coal rock contraction-expansion. Finally, contrastively analyzed the predicted results by model and site well testing permeability data of the application examples, and relative error is small, so this model has certain guiding significance for coal-bed methane mining.
出处
《岩性油气藏》
CSCD
2013年第3期97-101,共5页
Lithologic Reservoirs
基金
国家重大科技专项"深煤层煤层气增产改造技术研究"(编号:2011ZX05042-002-001)资助
关键词
煤岩
水分含量
渗透率
对比分析法
coal rock
moisture content
permeability
comparative analysis method
