西南石油大学学报（自然科学版）2017，Vol.39Issue(3)：103-110,8.DOI:10.11885/j.issn.1674-5086.2016.03.21.03
裂缝性低渗气藏水平井不稳定产量递减探讨
Investigation of Unstable Production Decline in Fractured Low-Permeability Gas Reservoir Horizontal Wells
摘要
Abstract
With respect to the problem of starting pressure gradients during the low-speed flow of a gas from low-permeability gas reservoirs,a flow model was constructed,solved,and qualitatively analyzed.Using a low-speed non-Darcy flow mechanism,a model of the unstable flow in fractured low-permeability gas reservoir horizontal wells was constructed with the starting pressure gradient taken into account.The mathematical model was solved and a typical curve of production decline in the horizontal wells was plotted.The last solution of this flow model,that is,the unstable production of low-permeability gas wells under constant pressure production conditions was used to provide the theoretical basis for the use of graph fitting methods to assess the reservoir parameters.Analysis of the effects of the starting pressure gradients and other related parameters on the production-decline curve showed that as the starting pressure gradient increased,the storage properties became poorer,the flow became more difficult,the horizontal well production decreased,and the production decline curve shifted downward.With the decrease in the elastic storage ratio,the matrix channeling occurred earlier,the concave down portion of the production derivative curve increased in duration,and the degree of the downward concavity increased.When the channeling coefficient decreased,the concave down portion of the production-derivative curve shifted later and the channeling occurred less easily.关键词
低渗气藏/双重介质/水平井/产量递减/启动压力梯度Key words
low-permeability gas reservoirs/binary medium/horizontal wells/production decline/starting pressure gradient分类
能源科技引用本文复制引用
曹丽娜,李晓平,罗诚,张芨强,谭晓华..裂缝性低渗气藏水平井不稳定产量递减探讨[J].西南石油大学学报（自然科学版）,2017,39(3):103-110,8.基金项目
国家重点基础研究发展计划(973计划)(2014CB239205) （973计划）
