Ellipsoids of uncertainty colored by dogleg severity depicted along the reference wellpath.
Doglegs are a fact of life in most/many well planning and drilling operations. Properly planned and drilled, doglegs are part of an optimized wellpath, avoiding problematic formations and maintaining the right drilling angle to reach the pay zone. Many factors influence whether the dogleg location and curvature are appropriate or undesirable. The more accurate and complete the subsurface data that well planners have, the better prepared they are to plan well trajectories that minimize dogleg severity drilling risks.
Unexpected doglegs, however, can wreak havoc later on, causing issues during drilling as well as during production. Evaluating dogleg severity throughout the well planning process can avoid problematic situations such as:
- difficulty placing casing strings due to dogleg severity
- keyseats created by repeated drill string abrasion risk bottom hole assembly components getting stuck
- cemented casing wearing quickly due to excessive contact between the drill string and casing inner diameter
- navigation problems for stiff bottom hole assemblies
- drill string friction created by multiple doglegs increasing the likelihood of getting stuck and failing to reach the planned total depth
Planning the Wellpath
WellArchitect is an advanced software solution for integrated planning and drilling of directional wellpaths with or without earth models. WellArchitect is designed to manage single and multi-well sites from start to finish: single/multi-well planning, survey calculations, collision risk-analysis, and data management. WellArchitect allows a planner to design any number of potential wellpaths, comparing the advantages and disadvantages of each in context of relevant geological formations and existing wells. WellArchitect offers users the ability to:
- Build complex wellpaths from simple building blocks using a spreadsheet-like application.
- Plan multiple wellpath versions for a wellbore to facilitate the comparison of alternate path compositions, collision risks, and survey programs.
- Avoid collisions as symbols along a wellpath are displayed while planning to indicate available space (including length and direction) for steering away from nearby wells; symbols are based on industry-recommended and user-defined anti-collision rules.
- Run automated clearance calculations ahead of the bit while drilling to give advance warning of collision risk with existing wells and avoid replanning proposed wells by not encroaching on their drainage area.
Evaluate alternate wellpath options in the context of the target and reservoir objectives.
WellArchitect’s 3D visualization capabilities are particularly powerful in helping planners to carefully evaluate subsurface conditions and identify factors that help minimize drilling costs. With WellArchitect, planners can:
- Incorporate data from earth models, logs, and reservoir grids to view wellpaths in combination with targets, offsets, positional uncertainty ellipsoids, and collision-avoidance data.
- Select coordinates interactively in 3D to use in the well design.
- Visualize wellpath relationships in a 3D space as well as on a traveling cylinder plane to optimize wellbore placement and minimize collision risk.
- Slice, shade, color, query, make transparent, and annotate 3D views to better understand spatial arrangement.
- Slice 3D models along a wellpath to provide a cross-sectional view of a stratigraphic or property model to aid geosteering.
- Query wellpath intersections at faults or horizons to better evaluate potential wellbore hazards.
Minimizing Dogleg Severity Drilling Risk
Monitor Wellbore Progress While Drilling
WellArchitect provides additional benefit during the drilling process, comparing drillbit progress against the planned wellpath.
WellArchitect: Planning and Monitoring Dogleg Severity
WellArchitect, an advanced well planning and survey management system for integrated planning and drilling of directional wellpaths from Dynamic Graphics, Inc., is designed to handle a wide range of well planning needs. By combining relevant datasets, creating detailed 3D visualizations of complex geological formations, and applying tools that minimize dogleg severity drilling risks, well planners can confidently plan optimized wellpaths. To learn more about WellArchitect contact our team.