Vortex-induced vibration inhibition device for marine riser of adjustable and rotatable separating disk
A suppression device and vortex-induced vibration technology, which is applied in the direction of drill pipe, casing, drilling equipment, etc., can solve the problems of high cost, inability to deal with arbitrary flow direction, complex structure, etc., to prolong the service life, not easy to corrode and damage , slow down the effect of vortex induced vibration
Inactive Publication Date: 2014-12-10
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
At present, the main passive suppression devices have various forms such as control rods, protrusions, streamers, and axial slats, but some of them have complex structures, some are expensive, and most of them cannot cope with arbitrary flow directions, and it is difficult to meet the complex working conditions of deep sea , therefore, it is urgent to design a new riser vortex-induced vibration suppression device
Method used
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Embodiment
[0023] According to the slenderness ratio of the actual riser 1 and the perennial statistical information of local ocean waves and currents, a reasonable basic unit spacing is designed and the required number of basic units is calculated.
[0024] When installing a single basic unit, first, put the sleeve 2 on the appropriate position of the riser 1; then, put the front half cylinder 4 and the rear half cylinder 6 on the sleeve 2 from both sides, and the front half cylinder 4 and the The groove 5 on the inner wall of the rear half cylinder 6 is to be connected with the outer convex ring 3 of the sleeve 2, and the front half cylinder 4 and the rear half cylinder 6 are connected and fixed by bolts; The tail end is inserted into the slot 8 along the axis and fixed with bolts; so far, a basic unit has been installed. Subsequently, install the remaining base units in series in the same installation order.
[0025] After the device is installed, the riser 1 is placed in seawater. ...
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The invention relates to a vortex-induced vibration inhibition device for a marine riser of an adjustable and rotatable separating disk. The device is formed by combining a plurality of basic units in series in an axis direction of the marine riser, wherein each basic unit comprises a sleeve and the adjustable and rotatable separating disk; the sleeves are mounted on the marine riser in a sleeving manner; and three outward convex circular rings with the same size are arranged in a perpendicular direction of an external wall of each sleeve at equal intervals. A front half cylinder and a rear half cylinder are mounted on each sleeve in a sleeving manner from the two sides, and grooves corresponding to the outward convex circular rings are formed in internal walls of every two half cylinders, so that free rotation of the device can be achieved by butting between the outward convex circular rings and the grooves. A distance between a tail baffle and an axis of the marine riser can be adjusted according to a practical marine condition. The complete device is made of plastic, so that the cost can be lowered greatly, and a manufacturing technology can be simplified. The device is convenient in field mounting, can rotate freely, and can effectively inhibit vortex-induced vibration caused by an incoming flow from any direction, so that an influence of the incoming flow on the fatigue life of the marine riser can be reduced.
Description
technical field [0001] The invention belongs to the technical field of laying marine riser facilities, and in particular relates to a marine riser vortex-induced vibration suppressing device with an adjustable and rotatable separation disc. Background technique [0002] my country's consumption of oil and natural gas is growing rapidly, and the demand for oil is becoming more and more significant. With the gradual depletion of onshore oil and gas, it has become an inevitable demand to vigorously exploit and develop offshore oil and gas. The oil and gas resources in the sea areas under our jurisdiction are very rich, especially in the South my country Sea. my country's first self-designed and built sixth-generation deepwater semi-submersible drilling platform "Offshore Oil 981" has officially started drilling in the South China Sea, marking a substantial step forward in the deepwater strategy of my country's offshore oil industry. However, deep-sea oil and gas exploration and...
Claims
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IPC IPC(8): E21B17/10
Inventor 朱红钧林元华戚兴赵洪南冯光潘倩李薛韩青华
Owner SOUTHWEST PETROLEUM UNIV