During the well operation, it is important to monitor the current state of production on an ongoing basis, identify water or gas breakthroughs, analyze the reservoir depletion, and predict the well operation parameters. Production logging is a key stage of the efficient field development management.

This paper presents for the first time the results of the three-phase well surveillance on the North Caspian shelf. The specific features of the wells being studied are the presence of a motherbore and sidetracks as well as a multi-phase flow. The purpose of the studies was to acquire information on the actual inflow profile distribution and its composition, borehole contribution ratio, as well as water and gas breakthroughs in the boreholes of the wells in question based on the results of the long-term production surveillance using the innovative technology – markers for the oil, water and gas inflow.

The collected data improve the quality of technological decision-making, which further contributes to enhanced hydrocarbon recovery and reduces operating costs. The paper presents the accumulated experience in conducting the studies of horizontal and multilateral wells at the North Caspian offshore fields.

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