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首页> 外文期刊>Journal of natural gas science and engineering >Coal permeability evolution with the interaction between nanopore and fracture: Its application in coal mine gas drainage for Qingdong coal mine in Huaibei coalfield, China
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Coal permeability evolution with the interaction between nanopore and fracture: Its application in coal mine gas drainage for Qingdong coal mine in Huaibei coalfield, China

机译：纳米孔与骨折之间相互作用的煤渗透性进化：中国淮北煤矿青东煤矿煤矿煤矿应用

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摘要

Permeability plays a significant role on CBM. However, the gas flow mode in nanopore and fracture is different, resulting in the confusion of gas flow mechanism. In this work, a dual-permeability model was constructed with the nanopore permeability and fracture permeability. Then, the impact of adsorption layer, elastic modulus reduction ratio, adsorption effect and stress on the evolution of pore parameters were investigated to reveal the interaction mechanism between nanopore and fracture. Finally, this model was carried out to analyze the coal mine gas drainage of Qingdong coal mine. Results show that, the adsorption layer primarily controls the effective pore radius and thus impacts the nanopore permeability and total permeability. The elastic modulus reduction coefficient can affect the fracture porosity and thus change the fracture permeability, gas mobility and equilibrium pore pressure. Then, the effective pore radius, nanopore porosity and nanopore permeability are affected. For the adsorption effect, it can notably affect the effective pore radius, nanopore porosity and fracture porosity. It is noticed that its effect focuses on the evolution process. Furthermore, the effective pore radius, nanopore porosity and fracture porosity are controlled by stress and the fracture porosity is more sensitive to the stress. Finally, the permeability model can match the field test results well, indicating that our model can be used to estimate gas drainage effect and relief zone for gas pressure. In addition, for the different reservoirs, once the coal basic parameters were determined, the gas production and gas permeability can be estimated by using this model. Therefore, it is important for guiding the gas drainage in coal mine gas prevention and control.
机译：渗透性对CBM起着重要作用。然而，纳米孔和裂缝中的气体流动模式不同，导致气流机构的混乱。在这项工作中，用纳米孔渗透性和裂缝渗透构建双渗透性模型。然后，研究了吸附层，弹性模量减少比，吸附效应和对孔隙参数演化的影响，以显示纳米孔和骨折之间的相互作用机理。最后，该模型进行了分析青东煤矿的煤矿煤气排水。结果表明，吸附层主要控制有效孔径，从而影响纳米孔渗透性和总渗透性。弹性模量降低系数可以影响断裂孔隙率，从而改变裂缝渗透率，气体迁移率和平衡孔隙压力。然后，有效的孔径，纳米孔孔隙度和纳米孔渗透性受到影响。对于吸附效果，它可以显着影响有效的孔径，纳米孔孔隙度和断裂孔隙率。注意到其效果侧重于进化过程。此外，通过应力控制有效孔径，纳米孔孔隙率和断裂孔隙率，并且裂缝孔隙率对应力更敏感。最后，渗透性模型可以良好地匹配现场测试结果，表明我们的模型可用于估计气体压力的助气效果和浮雕区域。此外，对于不同的储层，一旦确定了煤基本参数，可以通过使用该模型来估算气体生产和透气性。因此，重要的是引导煤矿防空和控制中的气体排水。

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