LIU Hua, WANG Weihong, WANG Yanyan, et al. Productivity characterization method of shale gas wells[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(5): 63-69. DOI: 10.13809/j.cnki.cn32-1825/te.2019.05.008.
Productivity characterization method of shale gas wells
The productivity of gas wells in conventional gas reservoirs is mainly measured by open flow rate. The open flow rate is determined by gas test and production test data to evaluate the productivity of gas wells. Because of the particularity of geological characteristics and seepage mechanism
it is controversial to use which indexes to characterize the productivity of shale gas wells. Combined with the testing and production data of actual shale gas wells in China
it is proposed that the productivity of shale gas wells in different development stages can be characterized by three kinds of indexes—unhindered flow rate
recoverable reserves and gas production. When the productivity of shale gas wells is characterized by open flow
the empirical formula of
“one point method” in Fuling main area is established
and the reservoir capacity(
α
) is 0.25. For the production capacity test of multiple work systems
the multi-flow method has better adaptability in Fuling. When the productivity of shale gas wells is characterized by recoverable reserves
before shale gas wells enter the decline stage
the unsteady productivity evaluation method of shale gas fractured horizontal wells is selected; while after entering the decline stage
the recoverable reserves of shale gas wells can be predicted by empirical decline method. For shale gas wells with fixed production
the gas test production of the same oil nozzle can be optimized to characterize the productivity of shale gas wells. The research results lay a foundation for the dynamic analysis of shale gas well production and the formulation of development technology policy.