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<p>Determining the productivity index (PI) of horizontal wells in conventional/unconventional reservoirs is crucial for efficient hydrocarbon recovery. Existing models tend to overestimate the PI of longer horizontal wells due to simplified assumptions related to drainage geometry and pressure loss. Thus, this study introduces a novel model that accurately integrates Darcy’s law, pseudo-steady state flow, flow convergence, and multiple pressure loss mechanisms, including pipe bends, kinetic energy, accumulation, and friction. The results showed that while longer wells generally improve PI, additional pressure losses reduce this advantage. Increased horizontal permeability and formation thickness enhance PI, with the doubling of permeability causing up to an 80% increase. Sensitivity analysis demonstrated that the most significant factors affecting PI are formation volume factor, oil viscosity, horizontal permeability, formation thickness, and well length. These findings underscore the importance of optimized well design, flow line maintenance, and data monitoring in optimizing hydrocarbon recovery from horizontal wells.</p>

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Horizontal well productivity index based on Darcy’s law, pseudo-steady state flow, flow convergence, and pressure losses

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Roland Ifeanyi Nwonodi,
  • Emmanuel Nwonodi,
  • Stephen Onyegbula

摘要

Determining the productivity index (PI) of horizontal wells in conventional/unconventional reservoirs is crucial for efficient hydrocarbon recovery. Existing models tend to overestimate the PI of longer horizontal wells due to simplified assumptions related to drainage geometry and pressure loss. Thus, this study introduces a novel model that accurately integrates Darcy’s law, pseudo-steady state flow, flow convergence, and multiple pressure loss mechanisms, including pipe bends, kinetic energy, accumulation, and friction. The results showed that while longer wells generally improve PI, additional pressure losses reduce this advantage. Increased horizontal permeability and formation thickness enhance PI, with the doubling of permeability causing up to an 80% increase. Sensitivity analysis demonstrated that the most significant factors affecting PI are formation volume factor, oil viscosity, horizontal permeability, formation thickness, and well length. These findings underscore the importance of optimized well design, flow line maintenance, and data monitoring in optimizing hydrocarbon recovery from horizontal wells.