| 煤层气井排采初期合理排采强度的确定方法 |
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| 引用本文： | 倪小明 王延斌 接铭训 吴建光. 煤层气井排采初期合理排采强度的确定方法[J]. 西南石油大学学报(自然科学版), 2007, 29(6): 101-104. DOI: 10.3863/j.issn.1000-2634.2007.06.024 |
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| 作者姓名： | 倪小明 王延斌 接铭训 吴建光 |
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| 作者单位： | 1.中国矿业大学资源与安全工程学院，北京 100083； 2.中联煤层气有限责任公司，北京 100011 |
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| 摘 要： | 为了提高煤层气井产气稳定期和采收率，用微分几何学理论结合达西定律计算了沁南地区煤层气井初始排采强度。根据沁水盆地东南部单排3#煤层的排采井实测数据，用最小二乘法建立了实际初始产气压力与临界解吸压力关系，确定动液面下降高度；用微分几何理论结合达西定律计算了初始产气时的平均压力、影响体积，用于确定初始产气时的最佳影响半径；根据最佳影响半径与排采时间的联系，结合动液面下降高度计算出排采初期的排采强度。计算结果与现场实践吻合较好，初期合理排采强度的确定，既可防止储层激励，又可防止不必要的能源消耗，具有较好推广应用前景。
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| 关 键 词： | 煤层气 排采强度 煤层气井 渗透率 |
| 收稿时间： | 2007-03-06 |
REASONABLE PRODUCTION INTENSITY OF COAL BED METHANE WELLS IN INITIAL PRODUCTION |
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| NI Xiao-ming WANG Yan-bin JIE Ming-xun WU Jian-guang. REASONABLE PRODUCTION INTENSITY OF COAL BED METHANE WELLS IN INITIAL PRODUCTION[J]. Journal of Southwest Petroleum University(Seience & Technology Edition), 2007, 29(6): 101-104. DOI: 10.3863/j.issn.1000-2634.2007.06.024 |
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| Authors: | NI Xiao-ming WANG Yan-bin JIE Ming-xun WU Jian-guang |
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| Affiliation: | 1.School of Resource & Safety Engineering，China University of Mining and Technology，Beijing 100083，China；2.China United Coalbed Methane Co.,Ltd.，Beijing 100011，China |
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| Abstract: | In order to improve stable production period and recovery of Coalbed methane wells, the reasonable production intensity in initial production in Xinnan area is computed with differential geometry theory and Darcy′s law. Based on the measured data about the production wells in the condition of single drainage 3# coalbed in the southeast of Qinshui Basin, the relations between the initial and actual critical desorption pressure with the method of least squares is established, it is used to determine dropping height of dynamic liquid; an average pressure and influent volume in initial production are computed with differential geometry theory and Darcy′s law. They are used to determine the best effective radius; based on the relation between the best effective radius and drainage time, combined with dropping height, the production intensity in initial production is computed. The agreement of the final computation results with the practical data indicates this method can be used to prevent reservoir stimulation and reduce energy consumption, recovery can be improved. |
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| Keywords: | coal bed methane production intensity coal bed methane wells permeability |
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