Reducing Extended Reach Drilling Challenges With Data Integration

High-angle wellpath.

Paths are easily created from surface to align to multiple targets. Pictured: high-angle wellpath.

Extended-reach drilling (ERD), characterized by paths with long horizontal distances, is an approach to cost-effectively recover reserves. With a single wellbore, long-reach wells maximize reservoir exposure to boost productivity and enhance drainage capability. ERD also brings the advantage of reduced environmental impact, reaching remote targets or covering a larger area from a single drilling pad.
Careful planning is critical to the success of extended-reach drilling projects. A detailed understanding of the geologic structures facilitated by 3D visualization combined with well-planning software can help identify and mitigate extended-reach drilling challenges that might otherwise jeopardize the project. Below we explain how integrating relevant sources of subsurface data to create a 3D geologic model and then using this model to plan an extended-reach well helps minimize risk and maximize recovery.

Design Well Trajectory to Minimize Risk

Well trajectory design is a critical process in minimizing the inherent risks posed by the high-angle and long horizontal-displacement of extended reach wells. Decisions made during the well design phase influence drill string and bottom hole assembly (BHA) designs, guide casing strategy, affect torque and drag, and determine directional drilling strategies.

In most environments, an extended reach well trajectory is not a simple geometric curve extending from pad to target. Complex geologic structures and petrophysical conditions can present significant drilling challenges anywhere along a proposed wellpath, requiring a more complex path. However, with as accurate as possible understanding of subsurface conditions, planners can design well trajectories that minimize these risks while also those associated with torque and drag, stuck pipe, and wellbore instability.

A Better Understanding of Geologic Structures

opens in a new windowEarthVision is a comprehensive software package for 3D model building, analysis, and visualization of subsurface environments and conditions. Well planners and drilling engineers who face extended reach drilling challenges will find that EarthVision provides the tools to understand complex geologic structures in detail and plan extended reach well trajectories in context of the geology.

EarthVision tackles these challenges by allowing users to:

  • create precise geologic models;
  • plan wells in the context of geological structures and formations;
  • optimize extended reach well trajectory along the entire wellpath; and
  • improve drilling accuracy with near-real-time data via WITSML.

Create Precise Geologic Models

EarthVision integrates relevant geophysical and geological data (2D grids, scattered data, property data, seismic sections, volumetrics) to create detailed models of complex geologic structures—compressional/extensional faults, major fault gaps, fault-wedge contours, salt diapirs, and overthrusts. The ability to visualize detailed geologic models in 3D enables well planners to more accurately identify the extended reach drilling challenges presented by the lithology, faults, and rock properties as they plan extended reach wells.

EarthVision offers a range of modeling capabilities that help to realize the maximum value from the integrated data used in creating the geologic model. Capabilities that provide an enhanced understanding of geologic conditions include:

  • highly complex compressional and extensional geologic models consistent in three dimensions
  • 3D fault block intersections and truncations
  • intermediate surfaces based on a reference surface and intermediate horizon picks using limited horizon data
  • 3D models of property distributions on a model-wide, fault block, or layer-specific basis
EarthVision enables reservoir teams to view and evaluate these 3D models at the field level, as well as a detailed understanding of the interactions of geologic and geophysical properties anywhere along a proposed extended reach well trajectory.

Plan Wells in the Context of Geological Structures and Formations

The 3D geologic model created by EarthVision provides the foundation for planning the extended reach well. To facilitate well planning, EarthVision also offers opens in a new windowindustry-standard well-design capabilities that work with the 3D geologic model. The ability to apply these tools in context of the 3D geologic model promotes efficient well trajectory planning, helping designers to:

  • evaluate the pros and cons of various kickoff points;
  • identify and avoid salt domes and problematic faults; and
  • calculate desired trajectories at key points along the proposed well path to minimize drilling risk and cost.
Capabilities that also aid in designing wellpaths include the calculation of positional uncertainty, as well as base map and cross-section plotting. An added benefit of the integration between 3D geologic models and well planning tools is the ability to easily (and interactively) transfer coordinates from the 3D model into the design for the extended reach well.

Optimize Extended Reach Well Trajectory Along the Entire Wellpath

The well plan is created in a spreadsheet that contains targets and design points whose coordinates can be obtained directly from the 3D model. To design the desired trajectories, the software provides functions to help determine which curve or sets of curves should be used. Some of the functions relevant to planning extended reach wells include:

  • calculating a wellpath, building inclination to the horizontal on the approach to the target
  • creating a path to a target location with a specified final inclination and azimuth
  • given multiple target locations, creating a path to the first target location so that it aligns with the second target
  • given multiple target locations, determining an appropriate depth  from which to kick-off
  • given multiple target locations, creating a path “in reverse” (from depth back up to surface) to determine an appropriate surface location

Working in the context of the detailed 3D geologic model removes much of the guesswork of planning high-angle and extended reach wells. Well planners can more easily identify geologic challenges that would impact drilling efficiency and readily evaluate multiple alternatives to circumvent them.

Improve Drilling Accuracy With Near-Real-Time Data

Not only does EarthVision facilitate better planning of extended reach wells, during the drilling phase it can depict the actual wellpath in context of the 3D geologic model. By displaying and examining near-real-time data such as mud logs or gamma ray logs obtained from the bottom hole assembly, drilling engineers can more accurately monitor drilling progress.

Drilling data can also be used to update the geological model to improve the accuracy of the model and the drilling process. For example, if a top comes in higher than expected, the model can quickly (and automatically) be updated to reflect the correct horizon, thereby giving drilling engineers a more accurate location of the drill bit relative to the local geology.

Depicting the actual wellpath in 3D, comparing it against the original plan and in context of the geological model, gives drilling engineers greater ability to identify and mitigate any unforeseen extended reach drilling challenges.

EarthVision: A Solution for Extended Reach Drilling Challenges

EarthVision’s data opens in a new windowintegration, 3D modeling, visualization, and well-planning capabilitiesopens PDF file provide geoscientists, well planners, and drilling engineers exceptional ability to more efficiently and accurately plan and drill extended reach wells.

When well planners and drilling engineers have access to 3D geologic models that accurately depict subsurface environments and conditions, they can readily identify extended reach drilling challenges and explore a range of options to minimize those risks.

EarthVision, from Dynamic Graphics, Inc., offers geoscientists, well designers, and drilling engineers the leading software for 3D model building, analysis, and visualization of subsurface environments and conditions. Its wide range of powerful visualization tools, including integrated seismic and cellular display, simplifies the analysis of geologic conditions, facilitates better well planning, and helps improve the accuracy of the drilling process. To learn more about EarthVision contact our team.

FURTHER READING

Risk Management in the Oil and Gas Industry: Multidisciplinary, Vendor-neutral Visualization for Better Decisions and Reducing Risks while Drilling

Target analysis and wellpath ellipses of uncertainty along a proposed wellbore, viewed in conjunction with structural models, can greatly reduce the risk associated with many drilling hazards.One sure way to minimize risk, regardless of the situation, is to obtain as...

The Importance of Vendor Neutrality in Data Fusion Software

For oil and gas industry professionals looking to interpret data and understand the big picture, they must turn to data fusion software. No single software product serves all the needs of those involved in the exploration, development, and recovery of hydrocarbon...

Reducing Subsurface Uncertainty with Data Integration and Visualization

The above image in CoViz 4D depicts a seismic horizon and velocity model in the time domain (top) and the same horizon, depth converted, along with the depth converted seismic cube, wellbores and horizon picks in the depth domain (bottom). Data used with the...

Multilateral Well Drilling Technology: Reducing Risk & Improving Production

Visualization and analysis of multiple lateral wells in a geologic context with CoViz 4D can help with greater flexibility in reservoir development. Data used by permission of owner.Multilateral well drilling technologies have evolved significantly since being...

The Value of Temporal Data Analysis in Reservoir Management

A fully integrated 4D solution requires all temporal data to be assimilated into a single system with access to both individual files and all data simultaneously, regardless of time steps. Sophisticated handling of the data enables the addition or exclusion of...

Overcoming the Challenge of Complex Reservoir Characterization

4D seismic together with reservoir simulation results are a powerful tool in optimizing production over the life of an oilfield.Engineers and geoscientists know more than anyone about the challenges associated with complex reservoir characterization, especially in...

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.

Quick, Accurate Relief Well Planning Using 3D Visualization Software

The crucial initial phase in the drilling of a relief well is the development of an extensive relief well plan. The planning requires geoscientists, drilling engineers, and well planners to have detailed information on the subsurface geology and its attributes as well...

Accessibility Tools
hide
XHot Key: CTRL-Q

Share on Social Media