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Transient Productivity Analysis and Completion Parameter Optimization of Perforating Herringbone Wells.

Zhijun Zhou1,2, Chunxue Cui2, Da Zheng3

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This study presents a new model for predicting the transient productivity of perforated herringbone wells, considering wellbore interference. Increasing shot density at the wellbore end is an effective method to enhance oil recovery.

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Area of Science:

  • Petroleum Engineering
  • Reservoir Engineering
  • Wellbore Engineering

Background:

  • Herringbone wells are crucial for enhancing oil recovery from mature reservoirs, especially offshore.
  • Their complex structure causes wellbore interference, complicating productivity analysis and perforation evaluation.

Purpose of the Study:

  • To develop a transient productivity prediction model for perforated herringbone wells that accounts for inter-branch and inter-perforation interference.
  • To analyze the impact of various perforation parameters on well productivity.

Main Methods:

  • Derived a transient seepage model for complex 3D herringbone well structures.
  • Applied line-source superposition method to study formation pressure, IPR curves, and radial inflow.
  • Conducted productivity calculations for different perforation schemes and orthogonal tests.

Main Results:

  • Obtained influence curves for perforation density, length, phase angle, and radius on transient productivity.
  • Identified that increasing shot density at the wellbore end significantly improves productivity.
  • Determined the impact of each parameter on overall productivity through orthogonal tests.

Conclusions:

  • The developed model accurately predicts transient productivity considering complex wellbore interference.
  • Selective completion perforation, specifically increasing shot density, offers an economical and effective strategy for improving herringbone well productivity.
  • Provides a theoretical basis for optimizing perforation completion technology in oil well construction.