INTRODUCTION
Use Case: Common Risk Segment Mapping for Cuttings Reinjection
A North Sea field team needed to determine the best location for a cuttings reinjection well. The group turned to the Common Risk Segment (CRS) Mapping workflow within CoViz 4D to easily and rapidly determine potential, data-supported, cuttings reinjection sites based on specific input criteria designed to minimize cost and risk.
The CRS process started with integration of the field’s simulation model, horizon surfaces, fault surfaces and well paths in the CoViz 4D visualization environment.
Figure 1. Data integration within CoViz 4D.
Each of these criteria was added to the Common Risk Segment Model graphical user interface, which also allowed for additional inputs that the group was not considering at the time: fluid contacts, seismic attribute cutoffs, drill center location, and a drilling envelope.
Figure 2. The CRS Mapping graphical user interface showing details of the Fault Controls, Horizon Controls and Drilling Controls tabs.
Utilizing minimum distance gridding, the CRS workflow generated a separate 3D grid for each user entered criteria (e.g., distance from fault, distance from well, etc.). Every grid node in each grid was assigned a classification based on the tertiary scheme: green (low risk), yellow (moderate risk), and red (high risk).
Figure 3. 3D grid of distance from wells. Red areas are less than 100m which fail the input criterion; green areas represent distances greater than 200m which pass the input criterion.
The Common Risk Segment Mapping workflow within CoViz 4D enabled the North Sea group to easily and rapidly assess multiple input criteria, and determine potential cuttings reinjection well locations. Furthermore, the CRS workflow could be customized to include additional criteria as the field conditions evolved over time.
Data Sources/Credits:
Data used with permission of owner.
