Evaluation of wave stimulation efficiency for bottomhole formation zone in terrigenous reservoirs of TATNEFT PJSC

UDK: 622.276.5.001.5:622.276.6 Пр.М.

DOI: 10.24887/0028-2448-2025-7-30-35

Key words: wave stimulation, bottomhole formation zone treatment, pressure transient analysis, skin factor, productivity, water cut, incremental production, evaluation of efficiency

Authors: V.А. Iktisanov (Empress Catherine II Saint Petersburg Mining University, RF, Saint Petersburg); N.А. Smotrikov (TatNIPIneft, RF, Almetyevsk); А.V. Baigushev (TatNIPIneft, RF, Almetyevsk); F.Z. Ismagilov (TatNIPIneft, RF, Almetyevsk); I.G. Fattakhov (TatNIPIneft, RF, Almetyevsk); А.А. Pimenov (TatNIPIneft, RF, Almetyevsk); I.G. Ustenko (Mechanical Engineering Research Institute of the Russian Academy of Sciences, RF, Moscow); G.S. Dubinsky (Mechanical Engineering Research Institute of the Russian Academy of Sciences, RF, Moscow)

The choice of methods to enhance the productivity of production wells in terrigenous reservoirs is small compared to carbonate reservoirs. In most cases, oil companies use hydraulic fracturing. However, this is an expensive method associated with the risk of production from waterflooded reservoir intervals in fields at late stages of development. Wave stimulation of bottomhole formation zone is a possible option for this type of reservoirs. To evaluate the efficiency of this method, pressure transient analysis was conducted in 8 production and 2 injection wells in terrigenous reservoirs of TATNEFT PJSC. For this purpose, folds-of-increase in oil and fluid productivity of the wells were determined depending on changes in skin factor and water cut after stimulation. Incremental cumulative production and average production rates were determined based on production forecast performed in the Topaze software and from actual field data. The results imply substantial variations in incremental production rates and productivity (injectivity) increase resulting from discrepancy of input well data. On the average, fluid and oil productivity of production wells increased respectively by 83 and 62 %. Profitability indices for simulated and actual incremental production rates exceed 1,3 suggesting successful technology testing. It was confirmed that maximum effect of wave stimulation is achieved at the highest skin factors before stimulation, low water cut and reservoir pressure near its initial pressure. The technology ensures better performance given high-quality input data on the reservoir and individual intervals beeing available.

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