Well Trajectory Design: Safe & Drillable Well Planning via Data Integration

The planned wellpath shows ellipsoids of uncertainty and the geologic, along with the ″eroded″ driller′s targets in context of the geologic model and nearby wellpaths.

The planned wellpath shows ellipsoids of uncertainty and the geologic (blue) (left image), along with the ″eroded″ driller′s (yellow rectangles) targets in context of the geologic model (right image) and nearby wellpaths.

Well trajectory design is noticeably more efficient when well planners incorporate all relevant subsurface data into their planning process. Integrating data such as geologic and petrophysical models, survey logs, shallow hazards, surface equipment, reservoir grids, and existing wells into a common visualization environment gives well planners the best possible understanding of the subsurface environment and all its complexities. The ability to visualize and evaluate factors that influence well trajectories helps well planners minimize drilling risks and costs, and facilitates maximizing the recovery of oil and gas resources.

Integrated Data Provides a Detailed Understanding of Subsurface Conditions

The wealth of data generated and analyzed by the various disciplines involved in reservoir development and management—geologists, geophysicists, geochemists, and reservoir, completion, production, and drilling engineers—provides insight into specific aspects of reservoir conditions. When these data are combined to create a more integrated understanding of subsurface conditions, well planners can explore data relationships that help determine:

  • How stratigraphy will impact drilling strategy and BHA components along the wellbore
  • Completion methods—casings, cementing, stimulation, and stages based on seismic and petrophysical data
  • Property distributions, such as porosity in a lithology layer originating in a sedimentary environment
  • Hazards from nearby wells or hardline and easement constraints
Well trajectory design conducted with access to relevant data supplied by the multiple disciplines responsible for reservoir development increases confidence in making decisions that result in safer and drillable well plans.

Integration and Visualization Maximize the Value of Reservoir Data

Integrated reservoir data achieves its greatest value when visualized in a 3D environment to depict geologic formations, reservoir properties, and existing infrastructure. The ability to explore a reservoir in 3D, from any perspective, allows well planners to assess potential plans with the context of the overall geologic structure as well as focus on a specific area to assess properties that influence subsurface well trajectory design. At the macro and micro levels, data integration and visualization enables drilling engineers to:

  • Plan the well trajectory from pad to target by interactively selecting intermediate and target locations in the 3D model and allowing well-planning software to determine (solve) the curve to connect the points.
  • Selectively intersect or associate targets when designing the well trajectory.
  • Visualize traveling cylinder diagrams in context of existing wells to aid in assessing collision risk.
  • Identify fault or horizon intersection angles that could present potential drilling hazards.
  • View a cross-section of a stratigraphic or property model to determine drilling requirements and aid in geosteering while drilling.
  • Include annotation along the planned trajectory to provide detailed guidance or explanation of conditions.
  • Develop and save multiple trajectory designs to evaluate the pros and cons of each plan with respect to drilling cost and long-term wellbore safety.
Integration and visualization of reservoir data also facilitate quick comparison of a proposed well trajectory with existing wells with similar geologic characteristics. Were any problems encountered during drilling? Were sidetracks required to circumvent problems? How accurately did the trajectory reach the target? What completion techniques were employed? What stimulations, if any, were made to optimize recovery? Lessons learned from comparable wells can guide well planners in developing safer and drillable well trajectory designs.

Unique Tools for Well Trajectory Design

Integration and visualization of relevant data allow well planners to develop well trajectory designs for optimizing wellbore placement within a reservoir. Software to easily integrate a wide variety and various formats of reservoir data, visualize them in 3D, and use those data to design well trajectories is available from Dynamic Graphics, Inc. (DGI). DGI, the leader in software solutions designed to solve complex spatial analysis problems for the petroleum industry, offers two software solutions for well trajectory design: WellArchitect, for those who need a full-featured directional well planning and drilling package, and Integrated Well Designer (an option within CoViz 4D), for members of the asset team who want to build their own trajectory design.
WellArchitect is an advanced software for integrated planning and drilling of directional wellpaths, including sidetracks, multi-laterals, and re-entries. WellArchitect can be used in the office as well as at the rig site for increased flexibility to handle everything from planning and survey calculations through data management and collision-risk analysis. The software includes traditional directional wellpath planning tools such as plotting, 3D visualization, anti-collision scanning (to evaluate the risk of collision between the planned path and other nearby wells), and target sizing to evaluate the size of the “driller’s target” (i.e., the geologic target “eroded” by the positional uncertainty of the path). WellArchitect goes beyond traditional tools by incorporating geologic and reservoir models, as well as 2D surfaces into the display while planning and drilling, including evaluating hazard-potential related to identifying intersection angles between the plan and faults or horizons.

WellArchitect goes beyond traditional tools by incorporating geologic and reservoir models, as well as 2D surfaces into the display while planning and drilling, including evaluating hazard-potential related to identifying intersection angles between the plan and faults or horizons.

Integrated Well Designer is available as an optional module in two other software products from DGI. One of the products, CoViz 4D, provides a vendor-neutral quantitative visual environment for reservoir management and seismic analysis. It enables reservoir teams to understand the changing reservoir response over time and optimize development and production decisions. Another product, EarthVision, provides the ability to create accurate and reliable 3D geologic models to facilitate improved reservoir characterization and environmental analysis, and enable more precise well positioning.
Integrated Well Designer allows non-expert well planners to interactively design wellpaths in 3D space using geologic, geophysical, and reservoir data. Geologic models can be queried at fault or horizon intersections to evaluate potential wellbore hazards. Well trajectories are created from simple building blocks using a spreadsheet-like application. Ellipsoids of uncertainty are displayed along with the wellpath. Traveling cylinder diagrams that interact with the 3D display indicate the relative location of offset wellpaths near or intersecting a planned path.

Integrate, Visualize, and Evaluate

Software tools that simplify the task of integrating different types of reservoir data, and provide a collaborative visualization environment as well as comprehensive planning tools, enable well planners to develop, evaluate, and recommend safer and drillable trajectory designs in context of subsurface conditions.
Dynamic Graphics, Inc., offers oil and gas professionals software solutions to solve spatial analysis problems in the petroleum industry. CoViz 4D, EarthVision, WellArchitect address different purposes in the hydrocarbon development workflow, yet when used together provide powerful visualization and analytic capabilities that facilitate collaborative well trajectory planning to minimize drilling risks and costs. To learn more about DGI’s products, contact our team.

FURTHER READING

Visualizing Open Hole Data for Multi-Disciplinary Teams

Understanding formation integrity and reservoir conditions are critical for success with open hole completions. CoViz 4D visualizations such as this can help.Open hole data is a primary dataset used by all geoscience and engineering disciplines in the O&G...

Residual Analysis of 4D Reservoir Simulation Grids

Reservoir simulation grid shown with the structural model, seismic and lathe plots of well logs. Data used with permission of owner.Predicting reservoir behavior is crucial for avoiding many challenges in the development of a hydrocarbon asset. A reservoir simulation...

An Integrated, Visual Approach to Well Data Analysis

Well logs are displayed in 3D, against a cross-section, and in a well panel, allowing reservoir and production engineers to visually verify their models.With the ability to acquire more detailed information throughout the course of well development, reservoir and...

Enhancing Seismic Survey Interpretation With Data Integration

Improved interpretations of seismic surveys are achieved when additional, relevant subsurface data are integrated with seismic data to provide better context for the analysis. However, the challenge of integrating the volume and variety of available seismic, geologic,...

OSDU Leverages Cloud Technologies to Simplify Data Access

Participation in industry consortiums such as the Open Subsurface Data Universe (OSDU) greatly enhances collaboration and information sharing across all aspects and disciplines of oil and gas field development and management.The evolution of technology in oil and gas...

Accommodating Non-Spatial Data Analysis in Decision-Making Workflows

Non-spatial data analysis is just as important as analyzing spatial data during hydrocarbon asset development planning. The combination of non-spatial data and varying streams of spatial data leads to better, faster, and more confident decisions.That’s why data...

Seismic Reservoir Monitoring Through Visualization

An ideal design, development, and management plan for hydrocarbon asset development comes from having a better understanding of  all known geological and petrophysical aspects of the subsurface. But given the dynamic nature of the reservoir and its attributes, petroleum professionals can encounter some complexities in the process of in-depth analysis.

Accessibility Tools
hide
XHot Key: CTRL-Q

Share on Social Media