Modeling of cuttings transport in directional wells using two-layer model

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  • Naganawa Shigemi
    Department of Geosystem Engineering, Graduate School of Engineering, University of Tokyo
  • Uematsu Hiroshi
    Department of Geosystem Engineering, Graduate School of Engineering, University of Tokyo
  • Takahashi Hiroshi
    Department of Environmental Studies, Graduate School of Environmental Studies, Tohoku University
  • Masuda Yoshihiro
    Department of Geosystem Engineering, Graduate School of Engineering, University of Tokyo
  • Ohbi Katsuhiro
    Japan Oil, Gas and Metals National Corporation

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Other Title
  • ２層モデルによる傾斜坑井の掘屑運搬挙動のモデル化
  • 2ソウ モデル ニ ヨル ケイシャ コウセイ ノ ホリクズ ウンパン キョドウ ノ モデルカ

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Description

A previously developed transient cuttings transport model using a two-layer model was modified to enable more practical simulation over the whole trajectory of a directional well. Two-layer model is usually used to describe solid-liquid two-phase flow in pipes in which cuttings bed is formed and the boundary between layers can be clearly recognized. In this study, two-layer model was extended to apply to describing cuttings transport behavior in relatively low hole inclination angles ranging from vertical to about 55 degrees, in which continuous cuttings bed was unlikely formed. Of the constitutive equations used, cuttings re-entrainment rate was re-formulated as a function of hole inclination angle and was corrected to match experimental results. To evaluate the modified model, field scale simulation on cuttings transport was carried out for a simple horizontal well. Simulation results showed that the modified model could successfully demonstrate transient behavior of cuttings transport over the whole trajectory of the well.

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