HDD Inadvertent Return (Frac-out) Analysis
This tool can evaluate the risk of hydrofracture on HDD projects. It is based on the Cavity Expansion Theory, first published by Luger and Hergarden in 1988 to determine the maximum allowable pressure that can be applied to a specific soil without causing hydrofracture. To improve correlation with actual as-built data, recent publications were also taken into consideration
Estimated Maximum Allowable Drilling Fluid Pressures and Annular Fluid Pressures
Estimated Factor of Safety Against Inadvertent Return
HDD Path Geometry
| Section | Length (ft) |
|---|---|
| Entry point to PC1 | |
| PC1 to PT1 | |
| Horizontal section | |
| PC2 to PT2 | |
| PT2 to Exit Point | |
| Total Drill Length, ft |
Pilot Hole/ Mud Assumed Properties
Drill Path Information