煤层气回收理论与技术综述：最新进展与展望,Energy & Fuels

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煤层气回收理论与技术综述：最新进展与展望
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-02-25 , DOI: 10.1021/acs.energyfuels.0c04026
Weiguo Liang ₁ , Jiwei Yan , Beining Zhang , Dongsheng Hou

Affiliation

煤层气（CBM）是煤层中发现的主要清洁能源。煤层气的采收率非常低，特别是在地面开采时，这是由于CH ₄在煤的孔隙和裂隙中的强烈吸附以及煤层的低渗透性所致。本文基于能量平衡理论，提出了通过能量刺激提高煤层气（ECBM）采收率的理论。从能耗的角度分析了煤层气中CH ₄的解吸和输运。为了提高煤层的渗透性，提出了两种节拍刺激技术：超临界CO ₂（SCCO ₂）压裂和注蒸汽热压裂。SCCO的实验研究及相关结果提出并分析了_2-提高的煤层气采收率。结果表明，随着有效应力的增加，被测四级煤样中SCCO ₂的渗透率呈负指数函数形式降低。SCCO ₂在地下深层高煤层中的输送能力要比浅层低层煤层中的低。焦煤中CO ₂与CH ₄的总渗透率的实验表明，随着CO ₂含量的增加，渗透率呈对数函数形式降低。SCCO ₂具有比气态CO ₂高的运输能力在煤层中，总渗透率随其在CH ₄合成系统中含量的增加而降低。SCCO ₂增强的煤层气回收实验表明，给定四个煤样的经济生产时间是不同的，因为将生产气中每种含量的50％定义为经济生产的阈值。气煤和无烟煤的经济生产所需时间比等级较低的弱粘结煤的生产时间更长。研究表明，不同等级的煤具有不同的内部结构和运输特性。但是，不同等级煤的原始结构可以通过SCCO ₂进行修改。通过改变空隙体积或孔隙和裂缝的结构。还介绍了煤层气采收理论和技术的挑战和前景。这项研究对于提高清洁能源煤层气回收率和深层煤层地下温室气体封存的新型双重有效方法具有重要意义。

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Review on Coal Bed Methane Recovery Theory and Technology: Recent Progress and Perspectives

Coal bed methane (CBM) is a primary clean energy source found in coal seams. The recovery ratio of CBM is very low, especially with ground extraction, due to the strong adsorption of CH₄ on the pores and fissures of coal and low permeability of the coal bed. On the basis of the theory of energy balance, a theory of enhanced CBM (ECBM) recovery by energy stimulation is proposed in this review. The desorption and transportation of CH₄ in coal beds are analyzed from the perspective of energy consumption. Two pacesetting stimulation technologies are proposed to increase the permeability of coal beds: supercritical CO₂ (SCCO₂) fracturing and thermal fracturing through steam injection. The experimental study and the related results of SCCO₂-enhanced CBM recovery are presented and analyzed. The results demonstrate that the permeability of SCCO₂ in the tested four ranked coal specimens decreases in the form of a negative exponent function with the increase of effective stress. The transportation capacity of SCCO₂ in high ranked coal beds deep underground is inferior to that in low ranked coal beds at shallow depth. The experiment of the total permeability of CO₂ with CH₄ in coking coal shows that the permeability decreases in the form of a logarithmic function as the content of CO₂ increases. SCCO₂ has higher transportation capacity than gaseous CO₂ in coal beds, and the total permeability decreases with its content increasing in the synthetical system with CH₄. The SCCO₂-enhanced CBM recovery experiment demonstrates that the economic production time is different for the four ranked coal specimens given 50% of each content in production gas being defined as a threshold for economic production. The economic production for gas coal and anthracite takes a longer time than that in weakly caking coal of a lower ranked coal. The study demonstrates that different ranked coals have different inner structures and transportation properties. However, the original structures of different ranked coals can be modified by SCCO₂ by changing the void volume or the structure of the pores and fissures. The challenges and perspectives for the CBM recovery theory and technology are also presented. The study is of importance with the novel dual efficient approach for clean energy CBM recovery ratio improvement and greenhouse gas sequestration underground in deep coal beds.

更新日期：2021-03-18

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