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Extended Hyperbolic Decline Curve Analysis in Shale Gas Reservoirs

  • Dianfa Du
  • Yanwu Zhao
  • Qiaoqiao Guo
  • Xuan Guan
  • Peng Hu
  • Dongyan Fan
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

To perform production forecasting in practice, lots of scholars and engineers have designed various techniques to interpolate the production both analytically and numerically, among which many decline curve analysis models have been proposed and widely used because of their simplicity and efficiency. Unfortunately, each model has their own limitations and is not applicable for all cases. For traditional reservoirs, common practice for production performance is decline curve analysis (DCA). However, when apply traditional DCA to shale wells, it is difficult to match the high initial production rate and extremely sharp decline rate in early period and the shallow decline rate at late times, simultaneously. Based on the Arps model, the extended hyperbolic production decline equation is developed, which includes four empirical parameters. Although the proposed method is not always accurate than peer models, it is likely as accurate and does not require the boundary-dominated flow start time nor to force a switch to hyperbolic decline. The validation of this new empirical DCA has been conducted by both extensive field data and simulation results for several wells. Comparisons with traditional DCA methods and numerical simulations indicate the relative advantages of this new approach.

Keywords

Shale gas Production forecasting Decline curve analysis Extended hyperbolic decline 

Nomenclature

DCA

Decline curve analysis

EEDCA

Extended exponential decline curve analysis

EHDCA

Extended hyperbolic decline curve analysis

SEDM

Stretched Exponential Decline Model

EIA

Energy Information Administration

EUR

Estimated ultimate recovery

qi

Initial gas flow rate

D

Nominal decline rate

βe

A constant to account for the early period

βl

A constant to account for the late-life period

\( n \)

An empirical exponent

Mscf

103 ft3

MMscf

106 ft3

ft

×3.048e−01 = m

ft

×2.832e−02 = m3

Notes

Acknowledgements

The authors would like to thank the support from SINOPEC Exploration and Production Research Institute sincerely. At the same time, this work was funded partially by Natural Science Foundation of China (51504277). These supports are gratefully acknowledged.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Dianfa Du
    • 1
  • Yanwu Zhao
    • 1
  • Qiaoqiao Guo
    • 1
  • Xuan Guan
    • 1
  • Peng Hu
    • 1
  • Dongyan Fan
    • 1
  1. 1.School of Petroleum EngineeringChina University of Petroleum (East China)QingdaoChina

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