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Reservoir Equilibrium Development Method by Combined Conformance Control of Polymer/Gel-Dispersed Fluids.

Xin Chen1, Jiayi Zhu1, Yiqiang Li2

  • 1College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China.

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PubMed
Summary
This summary is machine-generated.

This study introduces a new combined conformance control method for oil fields, optimizing fluid switching time using the displacement equilibrium factor (DEF). This method enhances oil recovery efficiency in heterogeneous reservoirs.

Keywords:
EORconformance controlelastic-dispersed fluidsequilibrium productionslug combinationswitching time

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Area of Science:

  • Petroleum Engineering
  • Enhanced Oil Recovery (EOR)

Background:

  • Reservoir conformance control is crucial for EOR efficiency.
  • Existing methods lack a combined approach for equilibrium production.
  • Polymers, HAPs, MGs, and PPGs are common conformance control agents.

Purpose of the Study:

  • To evaluate reservoir adaptability of different conformance control agents.
  • To establish a displacement equilibrium factor (DEF) for optimizing fluid switching time.
  • To develop a combined conformance control method for equilibrium production in heterogeneous reservoirs.

Main Methods:

  • Three-parallel core displacement experiments to assess polymers, HAPs, and MGs.
  • Development of the displacement equilibrium factor (DEF) considering profile improvement, oil increment, and oil recovery.
  • Establishment of a guidance graph for combined conformance control based on reservoir characteristics.

Main Results:

  • A DEF inflection point at 45% indicates optimal fluid switching time.
  • DEF below 45% enhances differential oil displacement effects between layers.
  • The proposed method increased oil recovery by 17.79% compared to conventional methods.

Conclusions:

  • The developed combined conformance control method and guidance graph enable equilibrium production in heterogeneous reservoirs.
  • Optimizing fluid switching time using DEF < 45% significantly boosts oil recovery.
  • This research provides theoretical and experimental support for designing effective oilfield conformance control strategies.