Analysis of connection operation window for deepwater managed pressure drilling riser system
Managed pressure drilling(MPD)technology is an important drilling technology to solve the problem of narrow drilling fluid density window in deepwater drilling.However,there is relatively less research on the connection operation window of the MPD riser system at present.In view of this,based on Euler-Bernoulli beam theory,this study considers the influence of high pressure in the pipe and drilling fluid flow rate on the basis of the conventional mathematical model of drilling risers and establishes a theoretical model of the deepwater MPD riser system with the direct stiffness matrix method.The finite element method is then used to discretize the theoretical model,and the numerical calculation solver of MPD risers is developed by using the MATLAB software.With a 1600 m deepwater well in the South China Sea as an example,the mechanical response of the MPD riser system is calculated by using the solver proposed in this paper and ABAQUS software under the same calculation parameters.The results show that the calculated results of the proposed solver are in good agreement with those of ABAQUS software.On this basis,this study conducts an analysis of the connection operation window of the deepwater MPD riser system and investigates the influences of high pressure in the pipe and drilling fluid flow rate on the operation window.The results show that the high pressure in the pipe has a great influence on the MPD riser connection operation window,while the drilling fluid flow rate has little influence on the MPD riser operation window.The connection operation window of the MPD riser is slightly larger than that of conventional drilling risers,and consequently the deepwater drilling efficiency can be improved.
managed pressure drilling riserhigh pressure in the pipedrilling fluid flow ratesafe operation window
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