positional uncertainty for measurement while drilling (mwd ... 2018/arctic safety 2018... ·...
TRANSCRIPT
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Positional Uncertainty for Measurement While Drilling (MWD) in the Barents Sea
Amir Gergerechi
Petroleum Safety Authority Norway
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Objective of Study
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Objective of Study
Present challenges related to positional uncertainties for
directional drilling using MWD in the Barents Sea,
specifically for deviated wellbores.
Mitigating solutions to these challenges
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BACKGROUND
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Well positioning
Anti-collision
Well control
Relief well
Background
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Vertical vs Horisontal
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Magnetic directional surveying
Source: The Artic University of Norway
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Industry Steering Committee on
Wellbore Survey Accuracy (ISCWSA)
The Operator’s Wellbore Survey Group (OWSG), A sub-committee of ISCWSA
Produces a set of industry-standard error models
These error models, commonly called "tool codes", represent the expected uncertainties when using various technologies and methods
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Ellipses of Uncertainty (EOU)
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RESULT
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Earth’s magnetic crustal
anomalies, 3D heatmap
Crustal VariationThe Earth’s crust contains magnetic minerals
Crustal anomalies is usually the biggest source of error for geomagnetic measurements
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Crustal Variation(IFR1)
IFR 1: Models local
variations using air or
shipborne magnetic
measurements
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Solar storm and Earth’s magnetic field
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Diurnal Variation (IFR2)
Interpolated In-Field Referencing IFR2
The Earth’s magnetic field extends into space where it
meets solar winds (charged particles from the sun)
Measuring real time magnetic disturbance field
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Total magnetic field(IFR1+IFR2)
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Earth's magnetic field
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RECOMMENDATIONS
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RECOMMENDATIONS
IFR1 requires detailed magnetic maps over the entire area of interest
IFR2 adds a real-time magnetic observatory within 50 km of the drilling site
Good drilling practices and attention to the magnetic properties of the
drilling assembly reduce positional uncertainty to acceptable levels.
The positional uncertainty can be reduced as much as 60 percent compared
with standard MWD surveying
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Heat map of distances to the nearest observatory