The field development plan of Vankor oil and gas field, located in the north of Krasnoyarsk region in East Siberia, includes periodic hydrodynamic research to update the existing model with data on reservoir and fluids characteristics. The applied logging methods are aimed to evaluate the reservoir inflow profile and to estimate and forecast the reservoir behavior and completion screens' performance. Also it is anticipated to perform the periodic cement bond, tubing integrity and interformational flows evaluation logging.

The well profiles in Vankor are designed with the horizontal section of more than 1,000 m. The complex well profile requires a special approach to intervention techniques, especially in cases when the wireline logging becomes practically impossible to perform because of the inability to reach the production zones. The coiled tubing is used In horizontal extended reach wells as the delivery method for downhole logging tools. However, as any other method, the coiled tubing has its operational limits. For successful job execution the most critical parameter is the depth of penetration that has to be reached before the helical bucjling and lockup occur, since the failure to reach the projected depth will mean the inability to get the logging data for formation and inflow and consequently will lead to the wrong assumptions and further field planning.

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