Drilling EngineeringDirectional Drilling
Average Angle Survey Displacements Formula
Average Angle Survey Displacements calculates north displacement for directional drilling workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (dMD, I_1, I_2, A_1, A_2) are known and the assumptions behind the cited directional drilling relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, dN equals 28.845686 ft.
dMDft
100
I_1degree
15
I_2degree
25
A_1degree
20
A_2degree
45
Inputs
dMD
ftMeasured Depth Interval
I_1
degreeUpper Survey Inclination
I_2
degreeLower Survey Inclination
A_1
degreeUpper Survey Azimuth
A_2
degreeLower Survey Azimuth
Outputs
dN
ft
North Displacement
dE
ft
East Displacement
dTVD
ft
True Vertical Depth Displacement
Source and review
reviewedDirectional drilling survey calculation methods.
Source