Flood Analysis

EOR and Waterflood Surveillance and Analysis:

Operating a secondary or enhanced recovery project (EOR) requires different surveillance and monitoring techniques than primary production operations.   OVS offers its Improved Recovery Analysis and Surveillance (IRAS) workflow to address this type of surveillance.  The workflow allows you to:

  • Perform pattern level analysis, including sensitivity on allocation values
  • Evaluate injection and withdrawal relationships across wells, patterns, groups of patterns and the field
  • Generate exception alerts and alarms based on the performance of the operation
  • Incorporate simulation, models, reservoir plans, scheduling rules and other items in your surveillance

The Challenge

While the headlines are dominated by the growth and expansion of the unconventional reserves, there is still considerable production from properties under some sort of improved recovery schema. Surveillance and analysis of these projects is difficult because each project has different parameters to track and optimize for both wells and patterns. In most operations, engineers, technicians, and databases administrators must spend a significant amount of time and resources keeping the surveillance tools properly populated.

The IRAS solution streamlines the analysis of these recovery projects allowing the engineers to identify and focus on patterns and wells that need attention.


IRAS provides a set of analysis techniques for improved recovery, ranging from common items like voidage replacement to specialized analysis such as temperature surveillance. New analysis tools can also be constructed, and easily configured, for either individual wells or aggregated groups or patterns.

IRAS allows for easy definition of patterns within the workflow, but also supports the use of external pattern definitions.  Pattern sets can also be created and changed if needed, to evaluate different  pattern configurations.  As part of the workflow, control may be granted to certain users for editing of patterns and pattern values.

IRAS allows for surveillance rules to be created to automatically generate performance exceptions for wells, patterns, or other entities. These exceptions can be delivered by email, in OVS reports, posted on maps, or in other analyses templates.

As with all workflows in the OVS Workflow Library, IRAS allows for quick integration to multiple data sources and applications.  For instance, simulation models from conventional simulators or streamline models can be incorporated to generate appropriate pattern allocations. Performance forecasts from decline analysis, production targets or models could be integrated to allow for surveillance alerts to be enabled.

Next Steps

The IRAS workflow is a valuable tool for those involved in surveillance of EOR or secondary recovery projects.  This solution has been deployed in a variety of asset types from the North Sea to West Texas.  It has also been successfully implemented alongside many other operational workflows like Gas-Lift Optimization.  For more information please contact OVS Group.

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