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A Transient Two-Phase Productivity Forecasting Method in Fractured Nanoporous Shale Gas Reservoirs.

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Summary

This study introduces a new method for forecasting shale gas well productivity, considering complex fluid flow and fracture interference. The findings reveal optimal engineering parameters and highlight the impact of well trajectory on production.

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Area of Science:

  • Petroleum Engineering
  • Geosciences
  • Chemical Engineering

Background:

  • Shale gas reservoirs are nanoporous media where hydraulic fracturing is key for development.
  • Complex two-phase flow and fracture interference create uncertainties in productivity forecasting.

Purpose of the Study:

  • To develop a transient productivity forecasting method for fractured nanoporous media.
  • To accurately characterize fluid transport and pressure drop interference.

Main Methods:

  • Reconstructed flow equations using a gas-water two-phase pseudo-pressure function.
  • Employed micro-segment discretization and the principle of superposition.
  • Modeled realistic well trajectories for dynamic productivity forecasting.

Main Results:

  • Increasing fracture count, half-length, and permeability yield diminishing returns, suggesting economic thresholds.
  • Higher water saturation, skin factor, and stress sensitivity decrease productivity.
  • Fractures at wellbore extremities produce more due to less interference; trajectory deviations increase heterogeneity.

Conclusions:

  • The proposed method reliably matches production history and captures typical three-stage production in shale gas wells.
  • Provides a basis for optimizing Estimated Ultimate Recovery (EUR) and fracturing design.