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首页> 外文会议>2005 SPE annual technical conference and exhibition (ATCE 2005) >Laboratory and Simulation Investigation of Enhanced Coalbed Methane Recovery byGas Injection
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Laboratory and Simulation Investigation of Enhanced Coalbed Methane Recovery byGas Injection

机译：天然气注气提高煤层气采收率的室内模拟研究

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Methane/carbon dioxideitrogen flow and adsorptionrnbehavior within coal is investigated from a laboratory andrnsimulation perspective. The samples are from a coalbed in thernPowder River Basin, WY. They are characterized by methane,rncarbon dioxide, and nitrogen sorption isotherms as well asrnporosity and permeability measurements. This coal adsorbsrnalmost three times as much carbon dioxide as methane andrnexhibits significant hysteresis among adsorption andrndesorption isotherms that are characterized as Langmuir-like.rnDisplacement experiments were conducted with pure nitrogen,rnpure carbon dioxide, and various mixtures. Recovery factorsrnare greater than 94% of the OGIP. Most interestingly, the coalrnexhibited ability to separate nitrogen from carbon dioxide duernto the preferential strong adsorption of carbon dioxide.rnInjection of a mixture rich in carbon dioxide gives slowerrninitial recovery, increases breakthrough time, and decreasesrnthe volume of gas needed to sweepout the coalbed. Injectionrngas rich in nitrogen leads to relatively fast recovery ofrnmethane, earlier breakthrough, and a significant fraction ofrnnitrogen in the produced gas at short times.rnA one-dimensional, two-phase (gas and solid) model wasrnemployed to rationalize and explain the experimental data andrntrends. Reproduction of binary behavior is characterized asrnexcellent, whereas the dynamics of ternary systems arernpredicted with less accuracy. For these coals, the mostrnsensitive simulation input were the adsorption-desorptionrnisotherms, including scanning loops. Additionally, the coalrnexhibited a two porosity matrix that was incorporatedrnnumerically.
机译：从实验室和模拟的角度研究了煤中甲烷/二氧​​化碳/氮的流动和吸附行为。样品来自怀俄明州粉河流域的一个煤层。它们的特征是甲烷，二氧化碳，氮吸附等温线以及孔隙度和渗透率测量。这种煤吸附的二氧化碳几乎是甲烷的三倍，并且在吸附和脱附等温线之间表现出明显的滞后现象，表现为类似朗缪尔的特征。在纯氮气，纯二氧化碳和各种混合物的条件下进行了置换实验。恢复因子大于OGIP的94％。最有趣的是，由于优先吸附了二氧化碳，煤表现出了将氮与二氧化碳分离的能力。注入富含二氧化碳的混合物会降低初始回收率，增加突破时间，并减少扫出煤层所需的瓦斯量。注入富含氮气的气体会导致甲烷的回收相对较快，突破时间较早，并且在短时间内会在产出气中产生大量的氮气。rn采用了一维，两相（气体和固体）模型来合理化和解释实验数据以及趋势。二元行为的再现具有极好的特征，而三元系统的动力学预测精度较低。对于这些煤，最敏感的模拟输入是吸附-解吸热等温线，包括扫描回路。另外，该煤表现出两个孔隙度矩阵，其以数值方式并入。

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