Abstract
The study of surge pressure is of significant importance for the safety of drilling process because field practice shows that the surge pressure caused by fluid viscous force can cause a great damage to the drilling operation. The accurate calculation of surge pressure is directly related to the safety of the drilling process. However, the existing surge pressure models rarely take the impact of the collar into consideration and thus will inevitably affect the precision of the surge pressure calculation. In this study, based on the pumping condition, a steady-state calculation model for surge pressure caused by drilling fluid viscous force is developed considering the presence of collar. In the end a case study is presented to demonstrate the importance of collar during the calculation of surge pressure.
Highlights
INTRODUCTIONA constant operation is the tripping in/tripping out of a drill string in the wellbore
During the drilling process, a constant operation is the tripping in/tripping out of a drill string in the wellbore
Under the pumping condition, this study will develop a steady state surge pressure calculation model and discuss the impact of collar on surge pressure caused by the viscous force of drilling fluid
Summary
A constant operation is the tripping in/tripping out of a drill string in the wellbore. Wagner et al (1993) considered the impact of temperature on the fluid rheology when calculating dynamic surge pressures (Robello et al, 2003; Rommetveit et al, 2005). The steady state surge pressure calculation method is not as accurate as dynamic method, but due to its simplicity and accuracy to a certain extent, it is still used in some oil fields. The literature review shows that the impact of the collar had not been taken into consideration while calculating the steady state surge pressure. Under the pumping condition, this study will develop a steady state surge pressure calculation model and discuss the impact of collar on surge pressure caused by the viscous force of drilling fluid
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