Why Are You Re-correcting Surveys!?
- 35° Turn in Lateral Results in Back Corrections
- AMI & Twist Estimates Gain Observability in Turn
- A 5° Lateral Turn Example Using Multi-Station Analysis (MSA)
How Do the IFR and BGGM Error Models Fare?
- Standard MWD
- Magnetic Survey Corrections
How Accurate is IFR Data at Depth?
- IFR data frequently comes from aero-mag surveys, hundreds of feet above the ground.
- May be checked at ground level for accuracy
- IFR error level at depth is not well known.
Are the Downhole Results Consistent with the Error Model Declination Magnitudes 16
- Chi-Square metric with known mean and variance
- Rejection of the Null Hypothesis at 1% probability or less
- Downhole declination disagreement with IFR error model is statistically significant
- Downhole declination disagreement with BGGM error model not statistically significant
Fitting the Data to a Gaussian Cumulative Distribution Function (CDF)
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View the entire Presentation:
Declination Error at Depth: A Comparison Study of Gyro vs. MWD Surveys
Chad Hanak, SuperiorQC