Volume 45 Issue 6
Nov.  2017
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FAN Song, LIANG Yi, WANG Lingyun, LEI Yu, SHI Haixia. Allowable Stress Calculation and Fatigue Life Prediction for H-Class Sucker Rods[J]. Petroleum Drilling Techniques, 2017, 45(6): 88-92. DOI: 10.11911/syztjs.201706016
Citation: FAN Song, LIANG Yi, WANG Lingyun, LEI Yu, SHI Haixia. Allowable Stress Calculation and Fatigue Life Prediction for H-Class Sucker Rods[J]. Petroleum Drilling Techniques, 2017, 45(6): 88-92. DOI: 10.11911/syztjs.201706016
shu

Allowable Stress Calculation and Fatigue Life Prediction for H-Class Sucker Rods

  • 1.

    Oil & Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi, 710021, China;

  • 2.

    National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, Shaanxi, 710021, China;

  • 3.

    No. 10 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang, Gansu, 745100, China

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  • Received Date: July 08, 2017
  • Revised Date: November 23, 2017
    Graphical Abstract
    • Abstract
  • In order to effectively use the H-class sucker rod,the method of allowable stress calculation and fatigue life prediction was studied.Using the indoor tensile strength test as a starting point,the ratio of tensile strength to yield strength was calculated,by which the calculation parameter for the maximum API allowable stress of H-class sucker rod was adjusted from 0.562 5 to 0.716 3.In addition,stress-fatigue plots of H-class sucker rod by fitting method were developed,so as to determine the ultimate fatigue stress of the sucker rod at the stress ratio of 0.1.By testing the fatigue performances of H-class sucker rods in different media and different stroke frequencies,the relationship among water cut,stroke frequencies and service life of the sucker rod were obtained.The innovative techniques for the calculation of allowable stress and prediction of fatigue life of the sucker rod were applied in 10 wells in the Xingnan Area of the Changqing Oilfield,and the results showed that the stress conditions of the H-class sucker rod could be improved through the optimal design,and tap the potential of the sucker rod,so as to meet the demands of field application for stresses and service life.
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    • References (10)
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