«Proceedings of Gubkin University»

Investigation of effectiveness of protective coatings for tubing in aggressive environment of Usinsk oil and gas field

UDC: 622.276.53:620.197.6:553.98
DOI: -

Authors:

¹ Ukhta State Technical University, Ukhta, Russian Federation
² National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: tubing string (TS), internal anticorrosion coating, sour corrosion, hydrogen sulfide, carbon dioxide, pressure vessel testing, Usinsk field, adhesion strength, electrical integrity

Annotation:

The article presents an analysis of the results of laboratory tests of various types of internal anticorrosion coatings used for protecting tubing strings in corrosive environments including hydrogen sulfide (H2S) and carbon dioxide (CO2) typical of the Usinsk oil and gas field in the Komi Republic. The objective of the work was to evaluate and comparatively analyze the corrosion resistance and operational characteristics of the most widespread coatings: MPAG-96, Ecomast Pipe, TS-3000C, and GIOTAEK 120M. Laboratory testing was conducted using autoclave testing in a CO2 and H2S environment. The results of post-service assessment of coating conditions were analyzed, defects were detected, and parameters affecting the service life and reliability of tubing strings under the considered conditions were determined. Following the conducted experiments and comparative analysis of four types of coatings, the MPAG-96 coating demonstrated the best results. Samples with this coating showed a high degree of resistance to hydrogen sulfide-containing environments and counteraction to the development of sulfide stress corrosion cracking. The presented research is for informational purposes and relates to hydrogen sulfide-containing media similar to water-oil emulsions of the Usinsk oil and gas field. In all specific cases, an individual approach is required to select protective measures against tubing corrosion and to take into account the specific conditions of each particular well (formation fluid composition, temperature, pressure, technological regime) when choosing the optimal type of tubing coating. In addition, it is necessary to regularly monitor the condition of the tubing coating during operation in order to promptly identify and eliminate defects, as well as to assess the effectiveness of the selected corrosion protection method.

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