The article presents the results of the well test (well №281) in Unvinskoye oilfield. Comparison of the results of determining the filtration characteristics of the oilfield using methods of calculating bottomhole pressure according to the curve of fluid level recovery and the results of depth measurement is provided. It is shown that the recalculation techniques of wellhead parameters to the downhole parameters when recovering pressure curves sensitive to the reliability of the source of information and the quality of well test. It leads to a significant errors in the determination of bottomhole filtration characteristics of the field, and as a result, distorted information about the state of the bottomhole formation zone.
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