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首页» 过刊浏览» 2020» Vol.5» Issue(1) 78-92     DOI : 10.3969/j.issn.2096-1693.2020.01.008
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煤岩吸附高压甲烷的实验与模型研究
曾泉树,高清春,汪志明
1 中国石油大学( 北京) 油气资源与探测国家重点实验室,北京 102249 2 中国石油大学( 北京) 石油工程教育部重点实验室,北京 102249
Experimental and modeling studies on high pressure methane adsorbed on coals
ZENG Quanshu, GAO Qingchun, WANG Zhiming
1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249 2 MOE Key Laboratory of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249

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摘要  吸附是甲烷在煤层中的最主要赋存方式,约占80%~90%。随开发进行,吸附态甲烷不断解吸,并将导致煤岩基质收缩,表现为裂隙的张开和渗透率的改善。基于气体等温吸附仪,开展了不同盆地典型煤样对甲烷的吸附能力测试,分析了甲烷吸附量随温度、压力和煤样工业分析指标的变化规律。认为吸附量随温度增加单调递减,随压力增加先增大后略有降低,在12~15 MPa左右存在极大值。认为固定碳是煤样吸附甲烷的主要成分,水分显著降低了煤样对甲烷的吸附能力。理论方面,对简化局部密度(SLD)理论中的流体状态方程和流固势能函数进行了评价、优选,结合测试数据确定了模型中的特征参数,有效表征了甲烷在煤样上的吸附特征。结合煤样的工业分析结果,建立了狭缝宽度、固固相互作用势能参数、表面积随煤样工业分析指标的变化关系式,拟合误差分别为3.9%、7.7% 和10.4%。利用工业分析指标的吸附特征参数表征值计算了甲烷在活性炭上的吸附量,与实验数据的平均相对误差均小于10%,实现了SLD理论的推广应用。
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关键词 : 煤层气;吸附实验;简化局部密度理论;推广应用
Abstract

Coalbed methane (CBM) is mainly adsorbed within the coal matrix, accounting for 80%~90% of the total reserves.The adsorbed methane will desorb as CBM recovery processes, and the matrix will shrink, showing up as the opening of cleats and the improvement of cleat permeability. Based on gas adsorption isotherms, methane adsorption tests were conducted on several coal samples from different basins, and the influences of temperature, pressure, and proximate analysis results on adsorption capacity were further analyzed. The results show that the adsorption will decrease with temperature. The adsorption will first increase then decrease with pressure, and the maximum adsorption occurs at a pressure of around 10 MPa. In addition,fixed carbon is the effective component adsorbing methane, on the contrary, equibrilium water content will reduce the adsorption.The equation of state and potential energy function were evaluated to obtain the optimal simplified local density (SLD) theory,wherein three parameters should be determined by fitting the experimental results. The SLD theory can describe the methane adsorption at pressures up to 20 MPa with a reasonable accuracy, the average relative errors between the experimental and predicted results are all within 0.90%. These three parameters were then represented by the proximate analysis results of adsorbent,the average relative errors are 3.9%, 7.7%, and 18.9%, respectively. Based on these the SLD theory were generalized, the average relative errors between the generalized and SLD results are all within 20%.

Key words: coalbed methane; adsorption experiment; simplified local density theory; application
收稿日期: 2020-03-28     
PACS:    
基金资助:国家自然科学基金青年科学基金(51804317) 和国家自然科学基金面上项目(51974333) 联合资助
通讯作者: wellcompletion@126.com
引用本文:   
曾泉树, 高清春, 汪志明. 煤岩吸附高压甲烷的实验与模型研究. 石油科学通报, 2020, 01: 78-92
链接本文:  
ZENG Quanshu, GAO Qingchun, WANG Zhiming. Experimental and modeling studies on high pressure methane adsorbed on coals. Petroleum Science Bulletin, 2020, 01: 78-92.
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