Operated by BP Exploration (Caspian Sea) Limited, Azeri-Chirag-Gunashli (ACG) is a giant field located in the Caspian Sea, Azerbaijan. Primary pressure support in the ACG field is achieved by water injection into co-mingled reservoirs completed across Fasila and Balakhany horizons. There are different types of down hole completion across ACG's water injection well stock; in some of those a permanent fibre optical cable is installed recording continuous DTS (distributed temperature sensing) data throughout the well life. Limited 4D seismic resolution, restricted access to the wells, a high cost of intervention and a time limitation for extended logging programs means that, in most cases, temperature in combination with pressure transient and well performance data are the only surveillance data that can be used for understanding and control of injection conformance.

This paper discusses multiple case studies using the integrated approach and methodology for temperature data acquisition and interpretation to control water injection conformance over the life of the ACG field.

There are many factors that affect the quality and accuracy of temperature log data which have been well described in the industry, hence these will not be looked at in detail in this paper. The paper will describe the importance of the multi-disciplinary teamwork required for a comprehensive logging program to ensure the most accurate and representative temperature data are acquired.

The paper also discusses the process of planning and execution of a temperature data acquisition program, together with real field examples of qualitative evaluation of water injection conformance.

The integration of the acquired temperature data with other static and dynamic surveillance data allows the operator to make critical decisions on water injection management.

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