Changes

These formulas are derived for calculation of well positions from data at specific survey points. Calculation of the location of a stratigraphic top or other depth of interest on the well log may require interpolation of the inclination and bearing angles between survey points. The simplest approach is to interpolate linearly between the survey points above and below the point of interest:

These formulas are derived for calculation of well positions from data at specific survey points. Calculation of the location of a stratigraphic top or other depth of interest on the well log may require interpolation of the inclination and bearing angles between survey points. The simplest approach is to interpolate linearly between the survey points above and below the point of interest:

:<math>\alpha_{m}  = \alpha_{i-1} + [(\alpha_{i} - \alpha_{i-1}) \times (\mbox{MD}_{m} - \mbox{MD}_{i-1}) / (\mbox{MD}_{i} - \mbox{MD}_{i-1})]</math>

:<math>\alpha_{m}  = \alpha_{i-1} + [(\alpha_{i} - \alpha_{i-1}) \times \left[\frac{(\mbox{MD}_{m} - \mbox{MD}_{i-1})}{(\mbox{MD}_{i} - \mbox{MD}_{i-1})}\right]</math>

:<math>\beta_{m} = \beta_{i-1} + [(\beta_{i} - \beta_{i-1}) \times (\mbox{MD}_{m} - \mbox{MD}_{i-1}) / (\mbox{MD}_{i} - \mbox{MD}_{i-1})]</math>

:<math>\beta_{m} = \beta_{i-1} + [(\beta_{i} - \beta_{i-1}) \times (\mbox{MD}_{m} - \mbox{MD}_{i-1}) / (\mbox{MD}_{i} - \mbox{MD}_{i-1})]</math>