Survey interpolation: A software for calculating correct wellpath between survey stations
Master thesis
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http://hdl.handle.net/11250/183490Utgivelsesdato
2012Metadata
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Sammendrag
In this Master’s thesis a Microsoft Excel Visual Basic for Applications (VBA) scheme is developed to automatically interpolate and calculate between survey stations. Interpolation techniques of the assumed
mathematical model of the Minimum Curvature Method (MCM) are used to determine borehole position
by employing measured depth (MD), Inclination and Azimuth as input parameters. Output parameters are
Dogleg Severity (DLS) and the 3D coordinates; True Vertical Depth (TVD), Northing (E) and Easting (E).
The aim is to compare survey data from continuous near bit inclination (NBI) measured by the Baker
Hughes’s AutoTrak tool and survey data from OnTrak tool (MWD). The AutoTrak NBI tool measures
inclination continuously while rotating and the OnTrak MWD tool measures directional coordinates
usually at 10 – 30 m intervals. By using the measured NBI from the AutoTrak instead of using an
interpolated inclination to calculate 3D coordinates between survey stations, especially the TVD, the aim
is to compare end survey station interpolations of the MWD survey with the end results obtained utilizing
the NBI for calculations. Comparison of the results showed that there is not much difference in calculated
end results between NBI and MWD surveys.
Beskrivelse
Master's thesis in Petroleum engineering