Abstract
During drilling in the deep water, the system including marine riser and drill string over the wellhead exits strong dynamic response because of the motion of platform. The contact-collision problem between the drill string and marine riser under platform swaying is a highly non-linear dynamics problem, drill string and marine riser contact-collision position along the axis of marine riser is randomly distributed, and that there exits friction. In this paper, by using the method of finite element, the model of dynamical behavior of the system is set up, the state of contact between marine riser and drill string shows randomness. The rule of free lateral coupling vibration of drill string and marine riser has been obtained; the result shows the situation of random contact between drill string and marine rising. By case analysis the result shows that the platform swaying has great effect to the system of marine riser and drill string.
Highlights
Deep-water drilling is one of the advanced drilling technologies at present
Deep-water drilling technology problems have increasingly attracted people’s attention, related technical problems in deep-water drilling become a focus of the study, coupling vibration of drill string and marine riser in deep-water drilling is one of important problems
COUPLING MECHANICAL MODEL As the contact position of marine riser and drill string is unknown in the contact-collision problem, there exits a sudden touch or a sudden non-contact, this will cause the system to sudden changes in stiffness
Summary
Deep-water drilling is one of the advanced drilling technologies at present. As the oil and gas development moving into deeper water, drilling and completing behaviors have been signification effected by severe weather [1]. With the increase of water depth, the forces of riser system are more severe and complicated, and higher strength and stability are requested. Deep-water drilling technology problems have increasingly attracted people’s attention, related technical problems in deep-water drilling become a focus of the study, coupling vibration of drill string and marine riser in deep-water drilling is one of important problems. For riser system research, only marine riser, in general the influence of drilling string is ignored. This paper analyzed the coupling effect of drilling string and marine riser, established the mechanics model, the static and dynamics rules were obtained.
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