三重介质底水气藏压裂水平井非稳态产能变化规律研究

樊怀才, 钟兵, 邓惠, 刘义成, 杨学锋, 冯曦, 张小涛

doi:10.11764/j.issn.1672-1926.2014.11.1861

天然气地球科学 >

2014 , Vol. 25 >Issue 11: 1861 - 1867

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.11.1861

天然气开发

三重介质底水气藏压裂水平井非稳态产能变化规律研究

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(1.中国石油西南油气田分公司博士后科研工作站，四川成都 610041|
2.西南油气田分公司勘探开发研究院，四川成都 610041|
3.西南石油大学博士后流动站，四川成都 610500

樊怀才(1983-)，男，安徽亳州人，博士后，主要从事油气藏工程及油气渗流理论研究. E-mail：fanhuaicai@163.com.

收稿日期: 2013-12-04

修回日期: 2014-02-13

网络出版日期: 2019-09-20

基金资助

国家科技重大专项“复杂碳酸盐岩气藏开发技术”(编号：2011ZX05015-03)|西南油气田分公司2012年博士后科研项目 “三重介质底水气藏治水开发机理研究”(编号：20120305-12)联合资助.

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Studies on Transient Productivity of Fractured Horizontal Well in the Triple Porosity Gas Reservoir with Bottom-water

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1.The Center for Post-doctoral Studies of Southwest Oil & Gas Field Company,PetroChina,Chengdu 610041,China|
2.Exploration and Development Research Institute of Southwest Oil & Gas Field Company,PetroChina,Chengdu 610041,China|
3.The Post-doctoral Research Station of Southwest Petroleum University,Chengdu 610500,China

Received date: 2013-12-04

Revised date: 2014-02-13

Online published: 2019-09-20

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摘要

针对三重介质底水气藏压裂水平井渗流规律和底水侵入气藏导致气井产能下降的特点，基于溶洞系统和基岩系统中的天然气向裂缝系统窜流，经裂缝系统产出的物理模型，将底水边界视为半滤失边界，建立了该类储层介质的非稳态渗流数学模型，并利用源函数、有限Fourier余弦变换和贝塞尔函数的积分方法得到了模型的点源解。在此基础上，采用解析法与数值离散法相结合的半解析方法获得了三重介质底水气藏多级压裂水平井的压力响应和非稳态产能计算模型。利用Stehfest数值反演得到了气井非稳态产能随时间的变化关系曲线，分析了气井产能的变化规律，研究了压裂裂缝条数、裂缝半长、裂缝间距、孔—缝和缝—洞的窜流系数及缝洞储容比等参数对气井非稳态产能动态特征的影响。研究方法和结果对合理分析三重介质底水气藏压裂水平井生产动态特征和优化压裂参数设计具有一定的指导意义。

关键词： 三重介质气藏; 底水边界; 压裂水平井; 点源; 非稳态产能

本文引用格式

樊怀才, 钟兵, 邓惠, 刘义成, 杨学锋, 冯曦, 张小涛 . 三重介质底水气藏压裂水平井非稳态产能变化规律研究[J]. 天然气地球科学, 2014 , 25(11) : 1861 -1867 . DOI: 10.11764/j.issn.1672-1926.2014.11.1861

Abstract

In order to investigate the seepage flow of the fractured horizontal well in the triple medium gas reservoir with bottom water and the reduction of the gas-well production due to the intrusion of bottom-water,based on a physical model where the gas in the cave and matrix systems channels to fracture system,and is produced through the fracture system,and the bottom-water boundary is considered as semi-filtration borders.The transient seepage mathematical model for triple medium gas reservoirs is established,and the mathematical model can be solved by the method of source function and the integral methods such as finite Fourier cosine transform and Bessel functions,and the point source solution is gotten.On this basis,the pressure response and the transient production model of multi-stage fractured horizontal wells are obtained by means of semi-analytical method which combines analytical method and numerical method.The transient production characteristic curve is obtained by means of the numerical inversion of Stehfest method.According to the analysis of the variation of gas production with time,the effect of fracture number,fracture half-length,fracture interval,the inter-porosity flow parameter and the storage-ratio on transient productivity is studied.The methods and results of this research contribute to the reasonable analysis of the production performance of fractured horizontal well in the triple medium gas reservoir with bottom-water and optimization of the fracturing design parameters.

Key words： Triple porosity gas reservoir; Bottom-water boundary; Fractured horizontal well; Source function; Transient productivity

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