When applying caisson protection to underwater production systems,the rigid connection between subsea pipelines,cross connecting pipe and the caisson's internal manifolds often leads to a lack of coordination between the piping and external cables when the caisson's foundation displacement exceeds the allowable design value.In severe cases,this can result in major engineering accidents such as pipeline rupture and oil leakage.By employing the coupled Euler-Lagrange(CEL)method and using ABAQUS finite element software,a computational model is established to analyze the impact of Hall anchor emergency anchoring on the displacement of submerged caissons.Based on the comparison with experimental results and the validation of the numerical model's reliability,the study simulates 102 different cases of ship anchoring processes,considering penetration velocities ranging from 6 to 22 m/s and anchoring distances ranging from 1 to 5 times the anchor length.The results indicate that the displacement of submerged caissons increases with increasing anchor penetration velocity and decreases with increasing anchoring distance.Based on the numerical calculation results and factor analysis,a prediction method for caisson displacement and a calculation expression for the safe anchoring distance under different penetration velocities are proposed.
Hall anchoranchoring distancesubsea production systemcaisson displacementdeep-sea oil and gas
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