Shale,Retrograde gas,Two-phase flow,Production prediction,Tri-linear model,"/> 页岩凝析气井产能预测的三线性流模型

天然气地球科学

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页岩凝析气井产能预测的三线性流模型

吴永辉,程林松,黄世军,白玉湖,徐兵祥,丁冠阳   

  1. 1.中国石油大学石油工程学院,北京  102249;2.中海油研究总院,北京  100027
  • 收稿日期:2017-06-20 修回日期:2017-09-16 出版日期:2017-11-10 发布日期:2017-11-10
  • 通讯作者: 程林松(1965-),男,湖北应城人,教授,博士生导师,主要从事油气渗流理论与应用研究. E-mail:lscheng@cup.edu.cn.
  • 作者简介:吴永辉(1991-),男,重庆开县人,博士研究生,主要从事油气渗流理论与应用相关研究.E-mail:wuyonghuijr@gmail.com.
  • 基金资助:

    国家科技重大专项“页岩气渗流规律与气藏工程方法”(编号:2017ZX05037001);中海石油(中国)有限公司综合科研项目“海外页岩油气产能评价技术与方法研究”(编号:YXKY-2016-ZY-03)联合资助.

A tri-linear model for production prediction in retrograde shale gas reservoirs

Wu Yong-hui,Cheng Lin-song,Huang Shi-jun,Bai Yu-hu,Xu Bing-xiang,Ding Guan-yang
 
  

  1.  1.College of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;2.CNOOC Research Institute,Beijing 100027,China
  • Received:2017-06-20 Revised:2017-09-16 Online:2017-11-10 Published:2017-11-10

摘要:

页岩凝析气井的产能预测须同时考虑复杂缝网改造体和油气两相流特征。基于三线性流模型表征压裂改造体,考虑流体相变和相渗,并用Langmuir等温吸附模型表征页岩基质中气体的吸附解吸,建立了页岩凝析气井产能预测数学模型。通过模型的线性化处理,结合流动物质平衡方法,获得了模型的半解析解。运用数值模拟结果和矿场生产数据验证了模型的准确性和实用性。结果表明:①通过饱和度和压力相关参数的显隐式处理,并结合流动物质平衡方法可以有效地将数学模型线性化;②所建立的油气两相产量预测半解析方法误差小,可运用于矿场实际;③相同条件下,页岩凝析气的流动能力比单相页岩气更弱,合理缝网参数对提高油气两相产能至关重要。
 

关键词: 页岩, 凝析气, 油气两相, 产能, 三线性流模型

Abstract:

In this paper,a tri-linear model is used to make production forecasts for retrograde shale gas wells after hydraulic fracturing.Gas desorption,phase behavior and relative permeability of oil and gas are incorporated in it.Because of nonlinearity of mathematical model,pressure relative parameters are handled implicitly with pseudo-pressure and saturation relative parameters are handled explicitly.A flowing material balance method is proposed in this paper to obtain a semi-analytical solution of the model.By comparing the semi-analytical solution to the solution of commercial numerical simulator and field production data from a retrograde shale gas well located in Eagle Ford play,the accuracy and practicability of the proposed semi-analytical method is validated.The results show that the mathematical model can be linearized with the semi-analytical model.Under the same condition,the flow ability of retrograde shale gas is weaker than that of single-phase,fracturing stages should be more;the fracture length reflects the stimulated reservoir volume,increasing fracture length can improve the reserves of the well;secondary fracture density and permeability have a large effect on production,it is necessary to increase the complexity and conductivity of the stimulated reservoir.
 

Key words: Shale')">

中图分类号: 

  • TE35

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