Deepwater drilling condition based marine riser mechanical behavior experiment simulation system and experiment method

Abstract

The invention discloses a deepwater drilling condition based marine riser mechanical behavior experiment simulation system. An upper three-component dynamometer (12), an upper connecting structure, a marine riser (13), a lower connecting structure and a lower three-component dynamometer (14) are connected between an upper trailer connecting plate (3) and a lower trailer connecting plate (4) in sequence, a drill stem (42) is arranged in the marine riser and connected with a driving device, the upper connecting structure is connected with a top tension applying mechanism, a drill pressure regulating mechanism is connected to the lower portion of the drill stem (42), and a submersible pump (5) is connected with the lower connecting structure. The invention further discloses an experiment method. The system has the advantages that mechanical behaviors of the water riser under deepwater drilling conditions and marine environment coupling effect can be simulated comprehensively and accurately, and the system can simulate ocean current environment, apply top tension to the water riser, simulate internal drilling fluid circulation at different flow rates, simulate rotation of the drill stem at different rotational speeds and apply different drill pressures.

Description

technical field [0001] The invention relates to the technical field of deepwater drilling simulation in petroleum engineering, in particular to a test simulation system and a test method for a riser mechanical behavior based on deepwater drilling conditions. Background technique [0002] Offshore oil and gas resources have now become an important part of the global energy strategy, and deep waters will become the main battlefield for future oil and gas exploration and development. However, the mining environment in deep-water areas is harsh, which puts forward higher requirements for deep-sea drilling equipment. In the offshore oil and gas resource exploitation project, the riser is the key equipment connecting the platform and the underwater wellhead. It has to withstand the coupling effect of the marine environment and drilling conditions, and is prone to accidents such as wear and fatigue fracture. Accidents cause significant economic losses and environmental safety issu...

AI Technical Summary

Problems solved by technology

However, there is a lack of research on the complex working conditions of the vortex-induced vibration characteristics of large slenderness ratio risers in the process of offshore drilling. In 2008, Guo Haiyan optimized the test design based on the original test and considered different tension, internal flow velocity and quality. The influence of ratio and other factors on the vortex-induced vibration response of the standpipe; in 2011, Guo Haiyan conducted a vortex-induced vibration response of the riser under different internal flow, external flow and top tension in the "wind-wave-current" combined flume of Ocean University of China test

Although the above-mentioned tests considering riser internal flow have further improved the simulation of riser drilling conditions, they still cannot comprehensively simulate the actual working conditions of risers in the real ocean drilling process, and the research on the mechanical behavior of risers is still not comprehensive enough.

Images