考虑储层孔隙介质分形特点的衰竭气藏储气库储层压力分布预测

doi:10.7623/syxb201305026

石油学报 ›› 2013, Vol. 34 ›› Issue (5): 1017-1022.DOI: 10.7623/syxb201305026

考虑储层孔隙介质分形特点的衰竭气藏储气库储层压力分布预测

于本福, 闫相祯, 杨秀娟, 王同涛

中国石油大学储运与建筑工程学院山东青岛 266580

收稿日期:2013-03-05 修回日期:2013-05-29 出版日期:2013-09-25 发布日期:2013-08-01
通讯作者: 闫相祯,男,1956年5月生,1982年获华东石油学院学士学位,1987年获北京科技大学固体力学专业硕士学位,现为中国石油大学(华东)教授、博士生导师,主要从事油气工程力学方面的教学与科研工作。Email:yanxzh@163.com
作者简介:于本福,男,1987年11月生,2009年获中国石油大学(华东)学士学位,现为中国石油大学(华东)储运与建筑工程学院博士研究生,主要从事储油库、储气库和石油管柱力学及安全可靠性研究。Email:yubenfu123@163.com
基金资助:
中国博士后科学基金项目(2012M511557)和山东省博士后创新基金项目(201102033)资助。

Dynamic reservoir pressure prediction of depleted reservoir gas storage considering the fractal feature of porous medium

YU Benfu, YAN Xiangzhen, YANG Xiujuan, WANG Tongtao

College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China

Received:2013-03-05 Revised:2013-05-29 Online:2013-09-25 Published:2013-08-01

摘要/Abstract

摘要：

考虑储层孔隙介质分形特点以及储层压力变化对储层介质渗流参数的影响,根据气体不稳定渗流理论,建立了衰竭气藏储气库储层压力动态分布的分形渗流模型,并推导出了注气过程动态储层压力的预测公式。在对本文模型计算结果与三维渗流模型计算结果对比分析基础上,研究了分形维数、弯曲率、储层厚度、气体黏度、注气速率和注气时间对地下储气库储层压力分布的影响,并计算了国内某衰竭气藏储气库BN-4井注气后的储层压力分布。结果表明:本文所建立的模型具有较高的计算精度,可以满足实际工程计算需求;分形维数和渗透率随着孔隙度的增大而增大,储气库储层介质的应力敏感性受毛细管外壁的岩性影响较大;衰竭气藏储气库的储层压力随着储层介质弯曲率、气体黏度、注气速率、注气时间的增大而增大,随着分形维数和储层厚度的增大而减小;分形维数、储层厚度、注气速率、注气时间对储气库储层压力的影响比较显著,而介质弯曲率和气体黏度对其影响不明显。为充分利用储气库储层,实际工程中注气井的间距不宜过大及可适当延长注气时间。

关键词: 衰竭气藏储气库, 天然气, 分形理论, 分形维数, 储层压力

Abstract:

Considering the fractal feature of porous medium and the influence of reservoir pressure change on seepage parameters in depleted reservoir gas storage, the fractal seepage model was built up to calculate the reservoir pressure based on unstable gas seepage flow. The reservoir pressure of depleted reservoir gas storage by the new model was compared with the results by three-dimensional seepage mathematical model. In addition, the influence faceors of reservoir pressure were studied, such as increase fractal dimension, tortuosity, reservoir thickness, gas viscosity, injection rate and time. The results show the fractal seepage model is precise and correct, and can meet the actual engineering demands. The fractal dimension and permeability increase with the increase of porosity. The stress sensitivity of porous medium in depleted reservoir gas storage is strongly influenced by rock property of capillary wall. The reservoir pressure of depleted reservoir gas storage increase with the increase of tortuosity, gas viscosity, injection rate and time, but decrease with the increase of fractal dimension and reservoir thickness. The fractal dimension, reservoir thickness, injection rate and time have great effects on the reservoir pressure, whereas the tortuosity and gas viscosity have little influences on it.

Key words: depleted reservoir gas storage, natural gas, fractal theory, fractal dimension, reservoir pressure

中图分类号:

TE722

于本福, 闫相祯, 杨秀娟, 王同涛. 考虑储层孔隙介质分形特点的衰竭气藏储气库储层压力分布预测[J]. 石油学报, 2013, 34(5): 1017-1022.

YU Benfu, YAN Xiangzhen, YANG Xiujuan, WANG Tongtao. Dynamic reservoir pressure prediction of depleted reservoir gas storage considering the fractal feature of porous medium[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(5): 1017-1022.

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考虑储层孔隙介质分形特点的衰竭气藏储气库储层压力分布预测

Dynamic reservoir pressure prediction of depleted reservoir gas storage considering the fractal feature of porous medium

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