Abstract
Steel catenary riser (SCR) is one of the most popular and economic risers in the development of deep-water oil and gas field. As a difficulty in the SCR design, the pipe-soil interaction at the touchdown zone is affected by the soil strength, riser diameter, upper floating body, and other factors. Conventionally, the pipe-soil interaction was mainly studied based on the static response of the riser under a linear seabed which was inconsistent with the actual situation. Therefore, a dynamic characteristic model was built in the paper for more realistic simulation of the pipe-soil interaction. And experiments were conducted to verify the reliability of the numerical model. Based on the verified model, the dynamic process of the nonlinear time-domain was analyzed. Different parameters, such as the soil strength and dynamic loads, were changed to analyze their effects on the pipe-soil interaction in the whole process which provided a certain foundation for the SCR design.
Highlights
In recent years, the oil and gas exploration has gradually turned to the deep-water area with the exhaustion of the oil and gas resources in shallow water
A dynamic characteristic model was built in the paper for more realistic simulation of the pipe-soil interaction
It could be found from the figure that, with the increase of the heave amplitude, the bending moment of the riser movements was increased gradually, and the riser bending moment was shown in the trend of rising first, decreasing and reaching the maximal value at the touchdown zone
Summary
The oil and gas exploration has gradually turned to the deep-water area with the exhaustion of the oil and gas resources in shallow water. Dunlap [10] simplified the pipe-soil interaction to the riser and placed it on a series of springs; the soil stiffness was simulated by a linear P-y curve. Though the pipe-soil interaction can be directly reflected, the linear elastic seabed model cannot describe the groove, nonlinear soil stiffness, soil suction, pipe-soil separation, seabed soil deformation, seabed soil attenuation and other complex problems [11,12,13]. The soil body effect was decreased rapidly at the maximum initial tangent rigidity when the riser penetration stopped and the reaction force uplifted. After the completion of a complete uplifting process of the penetration, the soil body resistance curve penetrated the riser again, reflecting the attenuation condition of the soil stiffness. The pipe-soil zone was penetrated and separated by the riser along the envelope curve
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