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| 水平井开采煤层气藏生产动态计算新数学模型 | |
| 引用本文： | 张健,汪志明,李晓益,王开龙.水平井开采煤层气藏生产动态计算新数学模型[J].煤田地质与勘探,2010,38(1). |
| 作者姓名： | 张健 汪志明 李晓益 王开龙 |
| 作者单位： | 1. 中联煤层气有限责任公司,北京,100011 2. 中国石油大学石油天然气工程学院,北京,102249 3. 中国石油集团钻井工程技术研究院,北京,100097 |
| 基金项目： | 国家科技重大专项研究项目(2008ZX05037) |
| 摘 要： | 基于朗格缪尔模型、菲克第二扩散定律和达西定律,综合考虑重力和气体压缩效应的影响,推导出描述煤层气和水渗流规律的基本偏微分方程组(并给出定解条件),且利用有限差分法对该数学模型进行了数值求解。计算结果表明,该模型能够有效模拟煤层气水平井的生产动态。通过对比是否考虑非稳态扩散和气体压缩效应时不同裂隙渗透率下的产气动态可知,忽略非稳态扩散和压缩效应,将人为缩短达到气体峰值产量的时间,增大产气峰值;将降低气体膨胀能,低估气井后期产能。煤岩裂隙渗透率越高,气井产能受渗透率回归效应影响越大,峰值产量的持续时间越短且产量下降速度快。因此在煤层气藏开采过程中,应根据气井的产气动态调整井底流压,建立合理的储层压力系统,以降低渗透率回归效应带来的不利影响。 |
| 关 键 词： | 煤层气 水平井 非稳态扩散 压缩 数值模拟 |
New mathematical model of horizontal well production for coalbed methane |
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| ZHANG Jian,WANG Zhiming,LI Xiaoyi,WANG Kailong.New mathematical model of horizontal well production for coalbed methane[J].Coal Geology & Exploration,2010,38(1). | |
| Authors: | ZHANG Jian WANG Zhiming LI Xiaoyi WANG Kailong |
| Institution: | 1.China United Coalbed Methane Co.;Ltd.;Beijing 100011;China;2.School of Petroleum Engineering;China University of Petroleum;Beijing 102249;3.Drilling Technology Research Institute;CNPC;Beijing 100097;China |
| Abstract: | Based on the Langmuir equation,Fick unsteady diffusion law and Darcy equation,the partial differential equations and the definite conditions which describe the mechanism of coal gas and water flow were established in consideration of gravity and compression.The method of finite difference was presented to solve the equations.It can be concluded that the model and algorithm are available on predicting the productivity of coalbed methane horizontal well.According to the productivity results under different fi... |
| Keywords: | coalbed methane(CBM) horizontal well unsteady diffusion compression numerical simulation |
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