STUDY OF THE INFLUENCE OF THE CENTERING OF THE ROCKING MACHINE ON THE STATE OF THE MOUTH SEAL

Authors

  • М. М. Liakh Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska St., Ivano-Frankivsk, 76019
  • І. R. Matskiv Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska St., Ivano-Frankivsk, 76019
  • Paweł Hyla AGH University of Krakow; al. Adama Mickiewicza, 30, 30-059 Kraków, Рoland
  • V. V. Mykhailiuk Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska St., Ivano-Frankivsk, 76019
  • R. О. Deineha Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska St., Ivano-Frankivsk, 76019 https://orcid.org/0000-0003-1141-7672
  • І. Ya. Faflei Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska St., Ivano-Frankivsk, 76019

DOI:

https://doi.org/10.31471/1993-9965-2024-2(57)-58-66

Keywords:

rod-type downhole pumping unit, polished rod, wellhead seal, rope suspension, simulation modeling, stress-strain state, foundation

Abstract

In Ukraine, rod pump units are used to run the majority of oil wells. Wellhead seals exhibit faster failure during operation, specifically as a result of uneven sealing element wear. This is greatly impacted by the radial forces created by the pumping machine's rocker head's axis not aligning with the well's axis. As a result, the well-head seal loses its tightness, the elements' service life is shortened, and the environmental dangers related to well product manufacturing rise. The article analyzes the designs of wellhead seals, their operating conditions, disadvantages and the impact of the misalignment of the axis of the rocker head of the pumping machine with the axis of the well on the operation of their seals. It was found that for wellhead seals, their service life is also nega-tively affected by water and mechanical impurities contained in the well products. A three-dimensional model was developed to analyze the operation of the polished rod and wellhead seal elements. The justification of the loads on the rod and wellhead seal was carried out based on analytical calculations performed for the SK-10 pumping machine. Simulation modeling was performed in the Ansys Workbench program, taking into account the materials of the wellhead seal elements and the polished rod, load schemes during their operation, etc. The results showed that the maximum stress in the seal sealing elements reached 4 MPa, and the maximum stress in the seal insert was 42 MPa. The results of the conducted studies revealed that even a small misalignment (1.2 mm) causes a significant redistribution of contact stresses between the polished rod and the wellhead seal sealing elements, accelerating their wear and, as a result, reducing their service life. It is crucial to concentrate on the rocker's centering in order to extend the service life of the wellhead packing and polished rod. Additionally, it is crucial to look into how soil, foundation, and climate affect the rocker's displacement in relation to the wellbore and centering disturbances.

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References

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Published

2024-12-29

How to Cite

Liakh М. М., Matskiv І. R., Hyla, P., Mykhailiuk, V. V., Deineha R. О., & Faflei І. Y. (2024). STUDY OF THE INFLUENCE OF THE CENTERING OF THE ROCKING MACHINE ON THE STATE OF THE MOUTH SEAL . Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas, (2(57), 58–66. https://doi.org/10.31471/1993-9965-2024-2(57)-58-66

Issue

No. 2(57) (2024): Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas

Section

MECHANICAL ENGINEERING

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