页岩气井产能表征方法研究

Abstract

Abstract:

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.

Key words: shale gas, productivity evaluation, open flow, recoverable reserves, empirical decline analysis

CLC Number:

TE37

Hua LIU,Weihong WANG,Yanyan WANG, et al. Productivity characterization method of shale gas wells[J]. Reservoir Evaluation and Development, 2019, 9(5): 63-69.

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References 16

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井号	α	二项式评价结果/ （10⁴ m³·d^-1）	“一点法”（12 mm油嘴）评价结果/（10⁴ m³·d^-1）
A1	0.32	58.82	59.91
A2	0.25	56.57	58.93
A3	0.26	43.17	43.28
A4	0.18	92.58	100.22
A5	0.25	63.73	69.10
平均值	0.25	61.40	63.79

Productivity characterization method of shale gas wells

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