考虑解吸扩散的页岩气藏气水两相压裂数值模拟  

Numerical Simulation of Fracturing Wells Considering Desorption and Diffusion Effect for Shale Gas with Gas-Water Two Phases

作　　者：赵金洲[1] 周莲莲[1] 马建军[2] 李勇明[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]玉门油田公司酒东作业区,甘肃酒泉735000

出　　处：《天然气地球科学》2015年第9期1640-1645,共6页Natural Gas Geoscience

基　　金：中国石油科技创新基金(编号:2011D-5006-0201);国家重点基础研究发展计划(编号:2013CB228004);新世纪优秀人才支持计划(编号:NCET-11-1062)联合资助

摘　　要：水力压裂是实现页岩储层有效开发的重要技术手段,而准确预测页岩气藏压裂井产量是保证页岩气高效开发的基础。以油气藏数值模拟和数值计算方法为工具,在考虑页岩基质块解吸扩散和窜流条件下,建立了页岩气藏气水两相压裂渗流数学模型,推导了数值计算模型,并研制了页岩气藏压裂产能模拟器,定量分析了裂缝参数、物性参数和解吸扩散参数对页岩气压裂井产量的影响。研究表明:水力压裂能有效提高单井产量,是页岩气藏高效开发的有效措施;压裂裂缝导流能力和天然裂缝渗透率是页岩气开采的主控因素,日产气量和日产水量随压裂裂缝导流能力和天然裂缝渗透率增加而增加;基质渗透率和扩散系数对产量的影响相对较小。Hydraulic fracturing is an essential technology to stimulate shale reservoirs,and accurate prediction of fractured shale gas well productivity is the basic for the efficient development of shale gas reservoir.This paper establishes a gas-water two-phase percolation mathematical model under the condition of desorption and diffusion by means of numerical simulation and calculation method.And the numerical model is given in this paper.By means of the simulator for post-fracturing performance of the shale gas reservoir is developed,and quantitative analysis of the influence of fracture parameters,physical parameters and desorption diffusion parameters to fractured shale gas well production is investigated.The research results show that hydraulic fracturing improves single well production,and it′s an effective measure to develop shale gas.Therefore the induced hydraulic fracture conductivity and natural fracture permeability are the main influence factors on shale gas production,and the higher the induced fracture conductivity and natural fracture permeability,the higher the gas and water production rate.Relatively speaking,the matrix permeability and diffusion coefficients have less effect on production.

关 键 词：页岩气 压裂 两相 解吸扩散 数学模型 数值模拟 产量 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]