A device and method for adjusting structural parameters of riser system to avoid vortex induced resonance
A technology of vortex-induced resonance and system structure, which is applied in the direction of drill pipe, casing, earthwork drilling and production, etc. It can solve the problems of inability to completely avoid vortex-induced resonance, economic loss of lifting and lowering standpipes, prolonging the operation period, and inability to quickly adjust emergency intervention and other problems to achieve the effect of saving operating costs, strong adaptability, and avoiding vortex induced resonance
Inactive Publication Date: 2018-05-22
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
Although these active control and passive control devices can achieve vibration suppression within a certain flow rate range, they cannot completely avoid vortex induced resonance, and cannot be quickly adjusted for emergency intervention
Lifting and lowering the riser will inevitably cause huge economic losses and prolong the operation cycle
Method used
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[0028] When the device of the present invention is installed, at first, the upper support ring 2 is clamped and fixed on the outer wall of the standpipe 1, and the upper ends of the eight support rods 3 are hinged to the hinge supports on the lower surface of the upper support ring 2 . Then, the lower support ring 5 is clamped and fixed on the outer wall of the standpipe 1, and the orientation of the lower support ring 5 is adjusted by rotation, so that the groove on the upper surface of the lower support ring 5 and the hinge seat on the lower surface of the upper support ring 2 are vertically aligned. Direction aligned. Next, the small motor 7 is placed in the groove of the lower support ring 5, and the rotating shafts on both sides of the small motor 7 rest on the side walls of the groove. Then, the fixed support 6 is installed on the side wall of the groove, so that the rotating shaft of the small motor 7 is limited between the side wall of the groove and the fixed support ...
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The invention relates to a device and a method for regulating riser system structure parameters to avoid vortex-induced resonance. The device consists of a support system, a driving system and a displacement sensor, wherein the support system comprises an upper end support ring, a lower end support ring and eight support rods; the driving system consists of eight small motors, eight screw rods and eight sliding blocks; the displacement sensor is arranged on the outer wall of a riser and is used for monitoring the vibration displacement of the riser in real time; when the vibration displacement of the riser increases sharply, the small motors are started to operate so as to drive the screw rods to rotate, so that the sliding blocks on the screw rods move relative to the screw rods so as to further drive the screw rods and the support rods to rotate, the triangular shape of structure composed of the screw rods, the support rods and the riser changes, therefore, the rigidity, damping and inherent frequency of the riser system are changed, a vortex-induced resonance region is avoided, and the vibration amplitude is greatly reduced.
Description
technical field [0001] The invention belongs to the technical field of vortex-induced vibration suppression for marine risers, and in particular relates to a device and method for adjusting structural parameters of a riser system to avoid vortex-induced resonance. Background technique [0002] The marine riser is a key part of the exploitation of marine mineral resources. It undertakes the important task of safely transporting seabed minerals and oil and gas resources to liquid surface facilities. It is often regarded as the life channel for the development of marine mineral resources. However, it serves in the harsh environment of ocean waves and currents, and under the action of seawater currents, vortex-induced vibrations inevitably occur. Especially when the vibration frequency of the riser is close to the natural frequency, it will cause resonance and accelerate the fatigue damage of the riser system. Once the riser fatigue fails, it will not only bring huge economic l...
Claims
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IPC IPC(8): E21B17/01F15D1/00
CPCE21B17/01F15D1/0025
Inventor 朱红钧唐有波
Owner SOUTHWEST PETROLEUM UNIV