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Study on the Phase Behavior Simulation Method of High-Salinity Reservoirs.

Zhongxin Ren1, Jianjun Li1, Hongfei Yuan2

  • 1China Oil & Gas Pipeline Network Corporation, Shanghai 200120, China.

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|May 13, 2024
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Summary

This study introduces a new phase equilibrium model for high-salinity reservoirs, accounting for salinity variations. The model accurately predicts phase behavior and salinity distribution, crucial for hydrocarbon exploration and production.

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Area of Science:

  • Petroleum Geochemistry
  • Physical Chemistry
  • Reservoir Engineering

Background:

  • Salinity significantly impacts the accuracy of existing equations of state and phase diagram analyses.
  • Ignoring salinity variations in high-salinity reservoirs leads to substantial errors in phase equilibrium calculations.
  • Conventional methods are inadequate for accurately modeling phase behavior in high-salinity environments.

Purpose of the Study:

  • To develop a more accurate phase equilibrium calculation model for high-salinity hydrocarbon reservoirs.
  • To investigate the influence of salinity on phase behavior and distribution.
  • To enable real-time monitoring of reservoir phase states.

Main Methods:

  • Incorporation of hydrocarbon-brine binary interaction coefficients and the α-function.
  • Definition of salinity and consideration of its variation with pressure and temperature.
  • Simulation of phase behavior based on mole percentage of water and salt content.
  • Phase distribution simulation using measured data.

Main Results:

  • A comprehensive phase equilibrium model for high-salinity systems was established.
  • Accurate phase diagrams and salinity distribution calculations were obtained.
  • The effects of water and salt content on phase behavior were successfully simulated.
  • The laws governing phase state and salinity variation in high-salinity reservoirs were determined.

Conclusions:

  • The developed model provides a more perfect calculation of phase equilibrium in high-salinity reservoirs.
  • Real-time monitoring of high-salinity reservoir phase states is achievable using fluid composition data.
  • The study offers a theoretical foundation for gas reservoir development and dynamic evaluation in hydrocarbon-brine systems.