Magnetic-Referencing-and-Real-Time-Survey-Processing-Enables-Tighter-Spacing-of-Long-Reach-Wells PDF 3
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Positional uncertainty in wellbores is caused by numerous error sources and propagates in magnitude along the<br>measured depth of the wellbore. This can be problematic when planning or drilling closely spaced long-reach wells<br>while still satisfying collision avoidance policies. The ellipses of uncertainty associated with surveys acquired by<br>standard Measurement While Drilling (MWD) tools are often too large to enable adequate separation factors<br>between wells. MWD tools are instruments mounted inside the bottom hole assembly (BHA) and use an<br>accelerometer and magnetometer sensor package to determ
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Magnetic-Referencing-and-Real-Time-Survey-Processing-Enables-Tighter-Spacing-of-Long-Reach-Wells PDF 3
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