Production Data Analysis and Productivity Forecast of Shale Gas Reservoir
详细信息
- 责任者：Xu Bingxiang (College of Petroleum Engineering ; China University of Petroleum ; Beijing 102249 ; China) ; Li Xiangfang
- 刊名：Journal of China University of Petroleum
- 出版年：2013
- 卷期：37(3)
- 关键词：页岩气 ; shale gas ; 产量 ; yields
- 页码：p.119-125
- 图表：illus., 1 table, 25 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
Based on the linear unsteady-state flow behavior,the type curves with the assumption of double porosity transient linear flow were used to analyze the production data of one multi-stage fractured horizontal well in Eagle Ford shale gas reservoir,and the original gas in place(OGIP) was estimated.Three flow regimes were identified on log-log plot consisting of apparent skin effect,matrix linear flow and boundary dominated flow.The matrix permeability was estimated based on matrix linear flow regime,and the results were verified with numerical model.The OGIP was calculated based on the boundary dominated flow regime which represents the total free gas in stimulated reservoir volume region.Furthermore,the productivity forecast was carried out and the effect of desorption was investigated.The results show that the total free gas in stimulated reservoir volume region is close to the result from hydraulic fracturing modelling,and the error is less than 15%.The effect of desorption depends on the reservoir pressure and the shape of isotherm adsorption curve.In early time of this case,desorption is not effective.However,for long-term productivity forecast,it is necessary to account for this phenomenon by providing an accurate isotherm since gas desorption makes the estimated ultimate recovery increase over 30%.
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