Drilling EngineeringDirectional Drilling
Horizontal Wellbore Center-to-Center Separation Formula
Horizontal Wellbore Center-to-Center Separation calculates horizontal center-to-center separation for directional drilling workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (dN, dE) 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, S_h equals 72.111026 ft.
dNft
60
dEft
40
Inputs
dN
ftNorth-South Offset Between Well Centers
dE
ftEast-West Offset Between Well Centers
Outputs
S_h
ft
Horizontal Center-to-Center Separation
Source and review
reviewedMansouri, Khosravanian, Wood, and Aadnøy 2020. Anti-well-collision proximity analysis using horizontal-plane and 3-D least-distance methods.
Source