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Investigation on the Flow Stability of Newtonian Fluid in Eccentric Annulus Via the Axial Reciprocation of the Inner Tube

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Abstract

The governing equation, together with the formulas of the averaged flux and the stability parameter for Newtonian fluid flowing in eccentric annulus via the axial reciprocation of the inner tube was established in the bipolar coordinate system. Numerical calculation was conducted for the measurement of water flow using the formulas above, of which the results agree well with the experimental data. It is shown that the flow instability can be induced by the increase of the stroke, the frequency, and the eccentricity of annulus, making the sucker rod more susceptible to partial abrasion. Some protecting methods, including adding centralizers, adjusting the stroke and frequency, are proposed to protect the sucker rod from the partial abrasion, and satisfactory results have been achieved in the oilfields.

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Authors and Affiliations

  1. Management Institute, Tianjin University, Tianjin, 300072, China

    Ai-wu Yuan

  2. Department of Petroleum Engineering, Daqing Petroleum Institute, Daqing, 163318, China

    Ai-wu Yuan & Hai-qing Cui

  3. Daqing Exploration and Development Institute, Daqing, 163712, China

    Tao Gao

Authors
  1. Ai-wu Yuan
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  2. Hai-qing Cui
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  3. Tao Gao
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Corresponding author

Correspondence to Ai-wu Yuan.

Additional information

Project supported by the National Natural Science Foundation of China (Grand No. 50674019) and the Natural Science Foundation of Heilongjiang Province (Grant No. A200501).

Biography: YUAN Ai-wu(1974-), Female, Ph. D., Senior Engineering

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Yuan, Aw., Cui, Hq. & Gao, T. Investigation on the Flow Stability of Newtonian Fluid in Eccentric Annulus Via the Axial Reciprocation of the Inner Tube. J Hydrodyn 19, 671–676 (2007). https://doi.org/10.1016/S1001-6058(08)60002-5

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  • DOI: https://doi.org/10.1016/S1001-6058(08)60002-5

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