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| Experimental Analysis of Sucker Rod's Fatigue Performance |
| Received:February 05, 2019 Revised:July 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.07.009 |
| KeyWord:sucker rod mechanical property corrosion medium fatigue strength tensile load |
| Author | Institution |
| LIANG Yi |
1. Changqing Oilfield Company of CNPC, Xi'an , China; 2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi′an , China |
| ZHAO Chun |
1. Changqing Oilfield Company of CNPC, Xi'an , China; 2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi′an , China |
| FAN Song |
1. Changqing Oilfield Company of CNPC, Xi'an , China; 2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi′an , China |
| LEI Yu |
1. Changqing Oilfield Company of CNPC, Xi'an , China; 2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi′an , China |
| SHI Hai-xia |
1. Changqing Oilfield Company of CNPC, Xi'an , China; 2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi′an , China |
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| Abstract: |
| Objective To effectively prevent and reduce the workover of oil wells caused by sucker rod breakage, and further reduce the cost of oil field development. Methods In this paper, Shimadzu electro-hydraulic servo fatigue testing machine was used to analyze the material composition of sucker rods of classes D and H, and the mechanical properties, fatigue strength under air and corrosive media, and the effect of tensile and compressive loads on fatigue performance were tested for comparison and analysis. Results The mechanical performance of Class H rods was better than that of Class D rods. The fatigue resistance of both rods decreased with the increase of water content. In the air, the fatigue performance of Class H rods was Superior to that of Class H sucker rods; in the corrosive environment, Class D sucker rods had better fatigue performance than Class H rods. The tension and compression load of both sucker rods had certain influences on fatigue. Conclusion Water content is a key factor that influences the corrosion fatigue performance of sucker rods. Class H sucker rods should be applied in low-water-bearing blocks. Class D sucker rods should be used in mid-high water-cut blocks. The additional pulling stress produced below the neutral point of sucker rods is a direct cause of eccentric wear of sucker rods. The design of righting and anti-wear should be optimized below the neutral point; in mid-high water cut areas, the replacement of sucker rods with longer service life should be used to reduce and prevent fracture of sucker rods. |
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