Abstract
The ram BOP (blowout preventer), as an important wellhead component, is subjected to the combined effects of stress and corrosion in high-temperature and high-pressure gas wells. In this study, to systematically evaluate the distinct characteristic and its application of a failed ram BOP, the mechanical properties of 8630 alloy steel and hydrogenated butadiene-acrylonitrile rubber are determined through experimental tests. In addition, the experimental results are further assigned to the ram BOP assembled in the complete finite element (FE) model, and the stress distribution in the failed ram BOP under the working conditions is analyzed quantitatively. Finally, the safety window for the maximum stress in the ram BOP versus the fillet radius and wellbore pressure is provided. According to the strength boundary line, the fillet radius could be optimized to adapt to harsh conditions. If the wellbore pressure changes, the ram safety factor can also be quantitatively assessed during shut-in. These results can provide a detailed theoretical basis and reference for field application and thus popularize the structural optimization of ram BOPs.
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