Abstract
The purpose of this work is to calculate Surge and Swab pressure in oil wells with eccentricity between drill string and wellbore or casing string. Analysis of this phenomenon, in which the fluid is confined between two eccentric cylinders, are made. The conformal mapping is used to lead the eccentric domain into the concentric domain, since the usual models correspond to concentric geometries. The results of this study, using the proposed methodology, are presented and discussed.
Highlights
The usual methodology for pressure calculation, during drilling of wells, assumes that the drill string and well work concentrically
As results, it is presented the calculation of the Surge pressure in a dummy well using the usual methodology and the proposed methodology
All case studies use data from Crespo, which are: i) geometry, considering the well being drilled by drilling column with length L=36 m, diameter d2=0.254 m and diameter of the coating column d1=0.508 m and ii) rheological, yield power law fluid with n=0.48, K = 0.74 Pa.sn e τ0 = 3.11 N/m2
Summary
The usual methodology for pressure calculation, during drilling of wells, assumes that the drill string and well work concentrically. Surge and Swab pressures are problems that can happen during the drilling of oil wells [1]. The prediction of these pressures is essential to determine the appropriate speeds and accelerations for introduction and withdrawal of the drill string in the wellbore [2]. Surge pressure is the increase in wellbore pressure, that goes beyond the maximum supported by walls. It can fracture the rock formation and causes fluid loss [3]. It is necessary to control and to manage the pressures, ensuring that they are within desired limits [3]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Transactions on Environment and Electrical Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
