裂缝性页岩气藏水平井产能预测模型  

A new model for production analysis in naturally fractured shale gas reservoirs

作　　者：徐兵祥 李相方[2] HAGHIGHI Manouchehr 张磊[2] 龚崛[2] 葛涛涛[2] 

机构地区：[1]中海油研究总院新能源研究中心,北京100027 [2]中国石油大学石油工程学院,北京102249 [3]阿德莱德大学澳大利亚石油学院

出　　处：《中国石油大学学报（自然科学版）》2013年第6期92-99,105,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家'973'重大基础研究发展计划(2009CB219606);国家科技重大专项课题(2011ZX05038-4)

摘　　要：基于页岩气藏线性、非稳态流动特点,考虑未压裂区双重介质特点及其对产气的贡献,建立页岩气多级压裂水平井渗流模型并求得定压条件下Laplace空间解。数值模型验证表明解析解与数值解吻合度高,在此基础上推导新的页岩气双孔瞬态产量典型曲线,补充和发展原有页岩气SRV模型典型曲线,并进行参数敏感分析,将新建典型曲线与SRV模型、Brohi模型典型曲线进行对比。结果表明:新典型曲线流动阶段表现为线性流与过渡流交替,较Brohi单孔外区模型典型曲线更复杂;气藏尺寸、窜流系数、内外区裂缝渗透率比对典型曲线影响很大,而储容比的影响不明显;未压裂区天然裂缝对气井产量有积极作用,对页岩气藏进行产能预测时不可忽略。Based on the transient and linear flow behavior of shale gas production,a new model and its analytical solution were developed to pred.ict the shale gas production in multi-stage fractured horizontal wells,in which the un-stimulated zone was considered as a dual porosity system.In order to validate the analytical solutions,numerical methods were also adopted,and good agreements between the two results were obtained.The characteristic gas rate curves were calculated using the new model,and sensitivity studies of various parameters were conducted based on dimensionless variables.The new characteristic curves were compared with the curves calculated using the SRV and Brohi＇s models.The results indicate that the new model can predict the flow regimes with linear flow and transition flow alternately,which are more complicated and realistic than that predicted using the Brohi model.The reservoir size,channelling coefficient and fracture permeability ratio all have significant effects on the characteristics of the gas production curves,while the effect of storativity ratio is not important because the porosity of the fractures is very low compared to that of the matrix.It may conclude that the un-stimulated region has an important contribution to gas production,which should not be neglected.

关 键 词：页岩气 产量分析 典型曲线 体积压裂 未压裂区 双重介质 

分 类 号：TE371[石油与天然气工程—油气田开发工程]