Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 5: 93 - 101

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.05.011

Reservoir Engineering

Study on oil-water two-phase productivity of horizontal wells considering actual well trajectory

  • BAI Haishi ,
  • MA Cheng ,
  • ZHAO Yulong ,
  • KANG Bo ,
  • ZHANG Ruihan ,
  • ZHANG Liehui
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  • 1. Southwest Petroleum University State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University,Chengdu, Sichuan 610500, China;
    2. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. Petro China Daqing Oilfield Co.,Ltd.Chongqing Oilfield Branch,Chongqing 402660, China;
    4. China ZhenHua Oil Co., Ltd., Beijing 100031, China

Received date: 2024-12-18

  Revised date: 2025-08-11

  Online published: 2025-10-30

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Abstract

With the growth of global energy demand, horizontal well technology has become an important means for oil and gas field development. Based on the equivalent wellbore radius principle and pressure drop superposition theory, combined with the oil-water two-phase pseudopressure function, a horizontal well oil-water two-phase productivity prediction model considering the actual well trajectory was established. The study results show that the oil production distribution along the horizontal well is generally "U"-shaped, with fluctuations in flow rate due to the actual well trajectory; as the length of the horizontal well increases, the oil production slowly increases; the production of each section of the horizontal well is positively correlated with permeability, and passing through high-permeability formations helps enhance productivity. In addition, the shape of the relative permeability curve has a significant impact on oil and water production. The concave water phase at low water saturation has the best oil production performance, while the reservoir water saturation increases with the oil production of the well gradually decreases. This study provides a theoretical basis for optimizing horizontal well design and improving well productivity.

Key words： horizontal well productivity; oil-water two-phase flow; equivalent wellbore radius principle; pressure drop superposition theory; actual well trajectory

Cite this article

BAI Haishi , MA Cheng , ZHAO Yulong , KANG Bo , ZHANG Ruihan , ZHANG Liehui . Study on oil-water two-phase productivity of horizontal wells considering actual well trajectory[J]. Special Oil & Gas Reservoirs, 2025 , 32(5) : 93 -101 . DOI: 10.3969/j.issn.1006-6535.2025.05.011

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