Abstract

A large scale carbonate steamflood pilot is being conducted in the Wafra field in the Partitioned Zone between the Kingdom of Saudi Arabia and the State of Kuwait. The primary objectives of the pilot are to reduce the technical uncertainties and economic risks associated with carbonate steamflooding and to determine feasibility for full field steamflood development. To help in accomplishing this objective, a Surveillance Plan, linked to an uncertainty management plan, was developed and implemented to focus the data gathering and analysis necessary to meet the project objectives.

The uncertainty management plan identified key uncertainties that must be mitigated to reduce the risk for full field steamflood development in the Wafra field. To reduce these uncertainties, a thermal surveillance plan was created that represented the measurements required on reservoir and facilities performance to evaluate the pilot performance and provide the information needed for the design and operation of a full field development. Each data element identified in the surveillance plan required a process for collecting, quality control, and storage of the information. The surveillance plan is designed to be an evergreen document with the flexibility to add and define new data collection requirements as required by the project response.

Because there are few carbonate steamfloods in the world, the LSP project has unique challenges that have not been typically encountered in other better understood sandstone thermal projects. Some surveillance activities were expanded as a result of observations occurring in the field and were added to the surveillance plan to enhance the understanding of the steamflood response.

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