Soft suspension device for drilling riser and operation method thereof

Abstract

The invention relates to a soft suspension device for a drilling riser and an operation method thereof. The device comprises the following components: a hydraulic damping system, and a suspension short section system; the hydraulic damping system comprises a hydraulic cylinder and a hollow piston rod assembled in the hydraulic cylinder; the hydraulic cylinder is divided into a rod cavity and a rodless cavity by the hollow piston rod; a cavity is formed in the hollow piston rod; the suspension short section system comprises a suspension short section, a top suspension mechanism and a hinge joint; the hinge joint is assembled at the lower end of the suspension short section and is used for being connected with the drilling riser; and after the suspension short section penetrates through the cavity of the hollow piston rod, the upper end of the suspension short section is connected with the hollow piston rod through the top suspension mechanism. According to the device, the hinge joint is assembled at the lower end of the suspension short section, the hinge joint is composed of two pin shaft universal joints which are perpendicular to each other, 360-degree free rotation in a horizontal plane can be achieved, the drilling riser can rotate around the hinge joint, and the purpose of releasing the bending moment load borne by the drilling riser is achieved.

Description

technical field [0001] The invention relates to a soft suspension device for drilling water risers and an operation method thereof, belonging to the technical fields of offshore oil engineering and drilling. Background technique [0002] In deepwater drilling operations, the drilling riser is an important channel connecting the subsea wellhead and the offshore operating platform, and is an important equipment for deepwater oil and gas exploration and development. When the riser encounters severe weather or working conditions (such as typhoon, strong internal wave current), the drilling platform needs to be evacuated urgently to ensure the safety of personnel and equipment. At present, the commonly used conventional platform avoidance scheme is to release the platform and recover all the risers and sail to a safe area. When the environmental conditions permit, the risers need to be lowered again to restart the drilling operation. This is extremely inefficient and results in ...

AI Technical Summary

Problems solved by technology

As a backup solution in an emergency (especially in typhoon conditions), this solution has certain safety risks. The suspended riser may collide with the casing of the re-jet nozzle, and the conventional riser is easily damaged due to excessive load in harsh environments. damage occurred

Due to the lack of special reinforcement measures, the ability of the suspended riser to adapt to harsh environments is restricted

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