多级压裂页岩气水平井的不稳定生产数据分析  

An analysis of unsteady production data of multi-fractured horizontal shale gas wells

作　　者：李欣 段胜楷 侯大力[3] 孙扬[3] 李士伦[3] 

机构地区：[1]美国Knowledge Reservoir咨询公司 [2]Chevron Energy Technology Company [3]"油气藏地质及开发工程"国家重点实验室·西南石油大学

出　　处：《天然气工业》2012年第12期44-48,127,共5页Natural Gas Industry

摘　　要：页岩气藏因其储层具有超低渗透特点,使得多级水力压裂水平井(MFHW)完井技术用于开发这些非常规资源变得经济可行,从而降低了天然气成本。所提出的多级压裂水平井不稳定生产数据分析方法有别于常规的页岩气藏分析方法,在气藏的孔隙度(φ)、渗透率(K)、储层厚度(h)和井的泄流面积(A)不确定的情况下,也能计算压裂气体体积(SRV)直线流的孔隙体积(Vp)和原始地质储量(OGIP)。该方法利用生产数据m(pi)-m(pwf)/qg和时间t的双对数曲线计算分析多级压裂水平页岩气井的Vp和OGIP。研究表明:该方法适用于单相气体流动,如果有两相以上流体流动,则需要对模型进行修改。The MFHW(multi-fractured horizontal well) technology is a feasible and cost-effective choice for developing shale gas reservoirs with low permeability.This MFHW method is different from other conventional analytic methods applied for shale gas reservoirs to make the calculation of the Vp of SRV and OGIP possible even when the reservoir parameters of porosity(φ),permeability(K),reservoir thickness(h) and discharge area(A) are not determined.This method adopts the production data([m(pi)-m(pwf)]/qg) and the double logarithmic curve of t to analyze the Vp and OGIP of multi-fractured shale gas wells.The study indicates that this method is applicable only for single-phase gas flow,and should be further modified for the two-or multi-phase flow.

关 键 词：页岩气 多级压裂 水平井 水力压裂 不稳定流 单相流 

分 类 号：TE37[石油与天然气工程—油气田开发工程]