Analysis of Wellbore Drilling Hydraulics Applying a Transient Godunov Scheme Considering Variations of Injected Flow Rates
International Journal of Oil, Gas and Coal Engineering
Volume 5, Issue 5, September 2017, Pages: 116-123
Received: May 30, 2017;
Accepted: Jun. 6, 2017;
Published: Oct. 24, 2017
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Rubén Nicolás-López, Mexican Petroleum Institute, Mexico, MEX
Angel Sánchez-Barra, Department of Petroleum Engineering, Faculty of Engineering, Autonomous National University of Mexico, Mexico, MEX
Oscar Valdiviezo-Mijangos, Mexican Petroleum Institute, Mexico, MEX
A new application of the Godunov scheme to describe dynamic oil-well behavior is presented. The numerical model is able to capture discontinuities associated with surface flow-rate variations. The finite volume method and Riemann problems are utilized for building the unsteady discrete solution. Initial and boundary conditions are related to cases of static, steady and transient well condition. Well data used in simulation are taken from true operational conditions and well mechanical configuration. The results of Godunov’s modeling describe the behavior of transient pressure and transient flow rate inside drill pipe and annulus. These profiles are commonly caused by turning on, adjusting mud flow rate and turning off the rig pumps. The evaluated rig indicators are: back pressure, pumping pressure, bottomhole pressure and injected flow rate. Calculated transient profiles are physically consistent and in good agreement with published well data. Therefore, engineering contribution is the application of first-order Godunov method to evaluate the transient hydraulics whereas variations of mud flow rate; also, the analysis and interpretation of the dynamic pressure behavior travelling inside the well. The Godunov scheme has robust engineering applications for modeling the transient drilling hydraulics, e.g., managed pressure drilling, hydraulics of pipe connections, and foam cementing, as well.
Analysis of Wellbore Drilling Hydraulics Applying a Transient Godunov Scheme Considering Variations of Injected Flow Rates, International Journal of Oil, Gas and Coal Engineering.
Vol. 5, No. 5,
2017, pp. 116-123.
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