Today it is trendy to pursuit of the development of hard-to-recover reserves, companies often do not pay due attention to the huge reserves at conventional reservoirs that has become difficult to recover due to ineffective field development. At the same time, the fields have a well-developed infrastructure, as well as favorable reservoir properties. The reason for stopping thousands of producing wells at such fields, as usual, is early time injected water breakthrough because non-optimal development, casing of high production at the early stage of reservoir development and ignoring reservoir surveillance and well diagnostics. Using the example of the analysis of reservoir surveillance results during development of one of the large oil fields, the authors show how the problems grew and led to the actual loss of half of the initially recoverable reserves. For this reservoir and its analogues production enhancement operations are developed for field productivity reactivation with the justification of their effectiveness. The information basis for current reserves localization is reservoir dynamic model calibration on the results of historical and additionally conducted production logging, well-testing and cross-well tests. Accounting for the injection and production vertical profile, clarifying areal displacement coverage of the reservoir, accounting for cross-flows, reservoir properties distribution and the current reservoir pressure made it possible to identify the most promising areas for production enhancement. Logs in transit wells confirmed dynamic model reliability. Drilling of horizontal wells and optimization of the production and injection targets are planned.
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