收稿日期: 2015-02-01
修回日期: 2015-04-04
网络出版日期: 2015-12-10
基金资助
国家自然基金“页岩气藏多级压裂水平井流动特征及产能评价方法研究”(编号:51374227);国家科技重大专项“大型油气田及煤层气开发科技重大专项”之“特低渗油藏有效开发技术”(编号:2011ZX0513-006);
国家自然基金“致密储层体积压裂缝网扩展模拟研究”(编号:51574265)
联合资助.
Pressure Transient Analysis of Fractured Horizontal Well in Composite Shale Gas Reservoir
Received date: 2015-02-01
Revised date: 2015-04-04
Online published: 2015-12-10
压裂改造体积SRV是评价储层改造效果的重要指标，是影响压力动态的关键因素。基于页岩气吸附解吸、扩散和渗流等多重运移机制，考虑压裂改造区的影响，建立内外区均为双重介质的复合页岩气藏压裂水平井试井模型。利用源函数思想，结合Laplace变换、叠加原理等方法，采用半解析法求取无限导流压裂水平井的井底压力响应。应用Duhamel原理考虑井筒储集和表皮效应的影响，结合Stehfest数值反演，绘制复合页岩气藏压裂水平井试井典型曲线，划分流动阶段。定义新无因次变量，分析SRV半径、裂缝条数、裂缝半长、裂缝间距、扩散系数、储容比、吸附解吸系数、渗透率系数及流度比等参数对压力动态的影响，该结果可为页岩气藏的合理高效开发提供理论依据。
姜瑞忠，滕文超，乔欣，徐建春，孙召勃，郜益华，范海军 . 复合页岩气藏压裂水平井压力动态分析[J]. 天然气地球科学, 2015 , 26(12) : 2336 -2342 . DOI: 10.11764/j.issn.1672-1926.2015.12.2336
As a significant index to evaluate the development of shale gas reservoirs,stimulated reservoir volume(SRV)has a great impact on pressure responses.We present a composite reservoir model where inner region and outer region are both regarded as dual porosity media to take into account of the effect of SRV.Multiple migration mechanisms of shale gas were also considered including desorption,diffusion and seepage.Line source function,Laplace transformation and the principle of superposition were used to obtain pressure responses of fractured horizontal well in composite shale gas reservoirs.Then the impact of wellbore storage and skin factor were considered by the Duhamel principle.Applying Stehfest numerical inversion algorithm,the bottom-hole pressure in real time domain can be calculated.Type curves were plotted and different flow regimes were identified.The effects of SRV radius,fracture number,fracture half length,facture spacing,diffusion coefficient,storability coefficient,adsorption index,permeability coefficient and mobility ratio on pressure responses were investigated.This model is more comprehensive and the results can provide more accurate instructions for economic reservoir development.
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