Waterflood management in carbonate reservoirs of TATNEFT PJSC fields based on tracer test interpretation results

UDK: 622.276.43.004.58

DOI: 10.24887/0028-2448-2026-7-24-27

Key words: tracer studies, fluid flows, carbonate reservoirs, reservoir pressure maintenance system

Authors: A.G. Kamyshnikov (TatNIPIneft, RF, Almetyevsk); S.V. Nasybullina (TatNIPIneft, RF, Almetyevsk); A.T. Zaripov (TatNIPIneft, RF, Almetyevsk); A.P. Chirkunov (TATNEFT PJSC, RF, Almetyevsk); A.N. Beregovoi (TatNIPIneft, RF, Almetyevsk); V.A. Sosnitskaya (TatNIPIneft, RF, Almetyevsk)

Interwell tracer test method is a direct tool for studying fluid flows from injection wells and determining the reservoir properties within the interwell space. However, due to poor efficiency of reservoir pressure maintenance system owing to the geological aspects of development targets with hard-to-recover reserves, tracer test results do not always enable to come up with appropriate system improvement solutions. Standard results of tracer studies of the reservoir pressure maintenance system are aimed primarily at acquisition of high-quality data suggesting the presence or absence of interwell communication. Due to specific geological aspects of carbonate reservoirs and in most cases relatively short-time tracer tests, standard quantitative interpretation does not provide sufficient information pertaining fluid flow behavior in the interwell space and reservoir sweep characteristics. These factors require additional analytical efforts to improve the information content and applicability of resultant data. The study demonstrates the need to use reservoir energy state data, as well as current geological and production factors that may have critical impact on the system. Combination of historical data and field test results ensures better understanding of the effects of interwell space characteristics and well operation conditions on currently maintained reservoir pressure, as well as the efficiency of reserves depletion in carbonate reservoirs. Research findings enabled setting up a program aimed to improve waterflood performance and reduce nonproductive injection.

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