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煤层气水平井压力饱和度关系及半解析生产预测模型
钟子尧,吴晓东,韩国庆
中国石油大学(北京),北京 102249
Pressure and saturation relationship in CBM reservoir and the semi-analytical production forecast model for the horizontal well
ZHONG Ziyao, WU Xiaodong, HAN Guoqing
China University of Petroleum-Beijing, Beijing 102249, China

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摘要  煤层气藏数值模拟是煤层气水平井历史数据拟合以及生产预测的有效工具,但是计算耗时长,所需参数多。为了得到一个简单而精度足够的生产预测方法,由稳态解析的产能方程结合非稳态的边界条件可以得到煤层气井在线性流下的半解析模型。根据煤层气水平井的数值计算结果以及前人的研究成果,煤层在一维(线性或径向)非稳态渗流阶段流体饱和度和压力的关系随时间、空间变化不明显。本文通过煤层渗流控制方程推导了压力和饱和度的计算模型,并给出了由地层压力近似计算含水饱和度的方法,为气水两相渗流模型提供了计算基础。通过半解析模型与数值计算结果的对比,以及对沁水盆地两口水平井的历史数据拟合,验证了半解析模型的正确性和实用性。
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关键词 : 煤层气, 两相拟压力, 生产预测, 吸附解吸, 两相渗流
Abstract

  Coalbed Methane (CBM) reservoir numerical simulation is an effective tool for history match and production forecast of CBM horizontal wells, while the calculation methods of numerical model are often complex and require many input parameters. In order to get a simple and accuracy of production prediction method, the steady-state analytical productivity equation combined with unsteady boundary conditions can deduce a semi-analytical model of coalbed methane horizontal wells in linear flow. According to the numerical calculation results of CBM horizontal wells and the predecessors’ research, the relationship between saturation and pressure does not vary significantly with time and space during transient flow and can be assumed to be unique for practical purposes. The corresponding approximate calculation of the water saturation can be made of formation pressure, and gas-water two phases pseudo-pressure can be obtained according to the relative permeability curve. The pressure and saturation calculation model arededuced in this paper based on the flowing control equation of CBM, and the calculation method of water saturation by formation pressure is given. It provides a calculation basis for the gas-water two phase seepage model. Compared with the results of numerical method, and the history match of two horizontal wells in Qinshui Basin, the correctness and practicability of the semi-analytical model for CBM horizontal well is verified.

Key words: CBM two phases pseudo-pressure production forecast adsorption and desorption two phases flow
收稿日期: 2016-11-11     
PACS:    
基金资助:国家自然科学基金资助项目(51574256)资助
通讯作者: 吴晓东, wxd_308@163.com
引用本文:   
钟子尧,吴晓东,韩国庆. 煤层气水平井压力饱和度关系及半解析生产预测模型[J]. 石油科学通报, 2017, 2(2): 251-257. ZHONG Ziyao, WU Xiaodong, HAN Guoqing. Pressure and saturation relationship in CBM reservoir and the semi-analytical production forecast model for the horizontal well. Petroleum Science Bulletin, 2017, 2(2): 251-257.
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