Anti-Collision Analysis

Wellbore Separation and Anti-Collision Analysis

Evaluate planned wellpaths against selected offset wells using center-to-center distance, separation factor, and positional uncertainty calculations.

Review separation results along measured depth, examine wellbore geometry using 3D Chase, and assess positional uncertainty using survey error models benchmarked against ISCWSA reference cases.

Explore Demo → ISCWSA Validation

DirectionalPlan 3D Chase visualization and Separation Factor graph showing offset well trajectories, uncertainty ellipses, and separation thresholds

DirectionalPlan offset well selection modal showing nearby wells, radius filtering, and selected plans

OFFSET MANAGEMENT

Select offset wells for comparison

Search nearby wells, filter by radius from the active surface location, and choose the specific plans or sidetracks to include in the anti-collision analysis.

DirectionalPlan organizes offsets by well and design so you can review the selection before calculating center-to-center distance, separation factor, and 3D chase results.

Radius-based well filtering from the active SHL
Search and review offsets by well, wellbore, and plan
Bulk actions for selecting or clearing visible results
Supports multiple plans and sidetracks in one review

Engineering Verification

Benchmarked Against ISCWSA Reference Calculations

Published ISCWSA survey uncertainty and clearance examples compared with DirectionalPlan calculations.

6,395 / 6,396 Covariance checks within tolerance

1,000 R4 clearance pairs across 10 offsets

0.0099 Maximum absolute ACR difference for reference ACR below 10 (444 pairs)

Published ISCWSA and DirectionalPlan EE covariance comparison

Well 2 — EE covariance 131 paired depth stations

DirectionalPlan-performed reference comparisons, not ISCWSA certification

View Full Validation Results → Download Comparison Data ↓

Test scope and limitations

One Well 1 NE covariance check at MD 1,620 m remains outside the applied tolerance. The supplied R4 comparison data covers offsets 1–9 and 11. ISCWSA ACR and DirectionalPlan's displayed SF use different calculations.

Separation Results

Center-to-Center Distance and Separation Factor

Review centerline distance, separation factor, and offset-specific results along the active wellpath.

Falcon Ridge — Example Anti-Collision Results

Minimum Separation Factor 1.75 Level 3 screening threshold

Active MD at Minimum SF 12,276 usft Measured depth along active wellpath

Offset at Minimum SF Falcon Ridge 2H Wellbore: OH · Design: OH

Center-to-center distance versus active measured depth for six Falcon Ridge offsets

Center-to-Center Distance 3D wellbore spacing by active MD, excluding positional uncertainty

Survey Uncertainty

Survey Error Models and Positional Uncertainty

Inspect instrument performance models and visualize calculated positional uncertainty along directional wellpaths.

DirectionalPlan Survey Tool Models manager showing MWD instrument performance models and individual error terms

Survey Tool Models Inspect survey error models, weighting formulas, and uncertainty sources

Ellipse rings and smooth envelopes are two ways to display modeled positional uncertainty, not physical wellbore diameters or separate collision-risk calculations.

Spatial Anti-Collision Analysis

Traveling Cylinder and 3D Chase

Inspect the relative positions of selected offset wells at specific measured depths using Depth Slice and 3D Chase views.

Traveling Cylinder polar depth slice at active MD 21400 usft showing distance rings and selected offset positions

Depth Slice High-side orientation and offset separation at a selected MD

Depth Slice and 3D Chase provide spatial views of selected wellbores. They supplement the center-to-center and separation-factor calculations used for engineering review.

DirectionalPlan Create AC Report dialog with summary, detailed rows, warning-only selection, interpolation interval, and configurable report columns — Configure report content, depth intervals, and detail columns

Engineering Reports

Anti-Collision Reports

Generate PDF reports containing an offset well summary, detailed separation results, and applicable warning levels. Include all calculated rows or limit the report to warning-level results.

Choose the interpolation interval and report columns, including measured depth, center-to-center distance, ellipse dimensions, separation factor, and status.

Falcon Ridge 3H Example Anti-Collision Report · PDF View Example Report →

DirectionalPlan

Explore the Anti-Collision Tools

Open the browser demo to explore the planning interface, or create a free account to access the complete platform.

Open Demo → Create Free Account