Method for changing the running sequence of marine riser joints and flanged marine riser joint

Abstract

The flange type riser joint has lock grooves matched with hydraulic riser running tools at both ends, the center axes of main connecting nut mounting holes and main connecting gasket mounting holes are completely same in size and position, throttle blowout line assembly and auxiliary line assembly, main connecting bolts and main connecting gaskets can be installed at any end of the flange type riser joint, and the lowering method for changing the lowering sequence of the riser joint is also provided. The hydraulic riser running tool can be lowered by using the lock groove at any end of the flange type riser joint, the lowering end of the riser joint can be changed, and the lock grooves at both ends of the flange type riser joint can be alternately used to lift and lower the riser joint, so that the damage of the lock groove of the flange joint at the main connecting nut end of the traditional flange type riser joint is solved, and the disadvantages of scrapping the riser joint or cutting the joint for replacement are solved.

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