引用本文:[点击复制]
[点击复制]
【打印本页】 【在线阅读全文】【下载PDF全文】 查看/发表评论下载PDF阅读器关闭

←前一篇|后一篇→

过刊浏览    高级检索

本文已被:浏览 662次   下载 1381 本文二维码信息
码上扫一扫!
页岩气藏运移机制及数值模拟
姚军,孙海,樊冬艳,黄朝琴,孙致学,张国浩
0
(中国石油大学 石油工程学院,山东 青岛 266580)
摘要:
基于双重连续介质,采用尘气模型(DGM)建立基岩和裂缝运动方程,基岩中考虑气体在基岩孔隙中黏性流、Knudsen扩散、分子扩散以及气体在基岩孔隙表面的吸附解吸,吸附采用Langmuir等温吸附方程;裂缝中考虑黏性流、Knudesen扩散和分子扩散机制,在此基础上建立基岩-裂缝双重介质数值模型并采用有限元方法对模型进行求解。根据数值模拟结果对影响页岩气藏产能的因素进行分析。结果表明:页岩气产出气是游离气和吸附气解吸共同采出的结果,在给定的页岩气藏条件下,游离气影响更大,吸附对页岩气产能有较大影响,忽略吸附会导致预测产能偏低;Knudsen扩散(或Klinkenberg效应)对基岩视渗透率影响较大,越靠近生产井,Knudsen扩散和Klinkenberg效应的影响越大,基岩视渗透率随生产时间延长变大;裂缝渗透率越大,页岩气产量越大,基岩渗透率对页岩气产能影响不大。
关键词:  油藏  页岩气  双重介质  尘气模型  吸附  有限元法  运移机制  数值模拟
DOI:10.3969/j.issn.1673-5005.2013.01.015
投稿时间:2012-09-24
基金项目:国家自然科学基金项目(51234007);教育部博士点基金项目(20110133120012);中国石油大学(华东)自主创新项目(11CX05007A);国土资源部海洋油气资源与环境地质重点实验室开放基金项目(MRE201207)
Transport mechanisms and numerical simulation of shale gas reservoirs
YAO Jun,SUN Hai,FAN Dong-yan,HUANG Zhao-qin,SUN Zhi-xue,ZHAGN Guo-hao
(School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China)
Abstract:
Based on dual porosity continuum media, the kinematic equations in matrix and fracture were built by using dusty gas model (DGM). Viscous flow, Knudsen diffusion, free molecular diffusion and gas adsorption-desorption in pore surface were considered in matrix, the Langmuir isotherm adsorption equation was used in the dual porosity model. Viscous flow, Knudsen diffusion and free molecular diffusion were considered in fractures. Matrix-fracture dual porosity numerical model was established and calculated by finite element method. The influence factors of shale gas production were analyzed based on the numerical simulation results. The results show that the produced gas comes from both free gas and desorbed gas. The influence of free gas on shale gas production is greater than that of desorbed gas, but the adsorption should be considered in prediction of shale gas production because the predicted shale gas rate is low without considering adsorption. The Knudsen diffusion and Klinkenberg effect have great impact on matrix apparent permeability especially near the production wells, and the matrix apparent permeability increases with production time prolonging. The shale gas production increases with the fracture permeability increasing, and the matrix permeability has little influence on shale gas production.
Key words:  reservoir  shale gas  dual porosity media  dusty gas model (DGM)  adsorption  finite element method  transport mechanism  numerical simulation
版权所有 中国石油大学学报(自然科学版)编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国教育部 主办单位:中国石油大学
地址: 青岛市黄岛区长江西路66号中国石油大学期刊社 邮编:266580 电话:0532-86983496 E-mail: journal@upc.edu.cn
本系统由:北京勤云科技发展有限公司设计