中国石油大学学报（自然科学版）Issue(5)：116-123,8.DOI:10.3969/j.issn.1673-5005.2014.05.016
页岩气藏分段压裂水平井不稳定渗流模型
Transient flow model of stage-fractured horizontal wells in shale gas reservoirs
摘要
Abstract
Considering the coexistence of adsorbed gas and free gas in shale gas reservoir, a mathematical transient flow mod-el incorporating gas desorption process was established based on dual porosity gas reservoir model. A new parameter was de-fined to represent the ratio of gas production from desorbed gas to that from free gas in matrix system. The analytical point source solution of shale gas reservoir was solved in Laplace space, and the bottom-hole pressure of multi-stage fractured hori-zontal well with constant rate was obtained by superposition. Then the impacts of wellbore storage and skin factor on well pro-duction performance were evaluated and the rate decline response at constant bottom hole pressure was investigated. The re-sults show that a large portion of gas production comes from desorbed gas. When gas desorption in shale matrix is considered, lower draw down pressure is required to achieve constant production rate for those fractured horizontal wells, it takes longer time for the pressure front reaching boundary, and the pressure derivative curve shows more obvious groove. If the fractured well is produced under constant bottom hole pressure condition, higher gas production rate and lower decline rate can be a-chieved. The results also show that the bigger the Langmuir absorption volume is, the slower the pressure front propagates,and the deeper the groove shows on the pressure derivative curve. But the Langmuir absorption pressure impact must be analyzed with both matrix pressure and Langmuir adsorption isotherm curve.关键词
页岩气藏/Langmuir等温吸附/压裂水平井/点源解/不稳定渗流Key words
shale gas reservoir/Langmuir adsorption isotherms/fractured horizontal well/point source solution/transient flow分类
能源科技引用本文复制引用
樊冬艳,姚军,孙海,谢银伍,曾慧,张凯..页岩气藏分段压裂水平井不稳定渗流模型[J].中国石油大学学报（自然科学版）,2014,(5):116-123,8.基金项目
国家自然科学基金重点项目(51234007) （51234007）
国家科技重大专项(2011ZX05005-006-007HZ) （2011ZX05005-006-007HZ）
中央高校基本科研业务费专项资金(14CX05025A) （14CX05025A）
中国石油科技创新基金项目(2012D-5006-0207) （2012D-5006-0207）
