Wave stimulation techniques to enhance oil recovery and/or remove formation damage in the near wellbore zone have been attracting interest in oil industry practice in recent years. It is known from literature that the technique has been successful in some cases, however, to-date, there are several controversial and inconclusive issues about the technology. The main point at issue is the physical mechanism of the wave stimulation process and its effect on different reservoir rocks. To gain greater insight into the process and to evaluate the efficiency of the wave stimulation technique in carbonate and sandstone reservoirs, Tatneft PJSC has carried out a wide-scale field experiment in the own producing assets. The experiment was carried out over a period of two years involving 23 wells on three pilot blocks. The wells adjacent to those with the waves’ generators were equipped with downhole gauges to measure pressure, production rate (or injectivity), and water cut of the wellstream. The field experiment comprised two stages: acquisition and analysis of production and injection wells’ data in absence of wave stimulation, and the same after starting and operation of generators. Reservoir flow capacity, viscosity and density of degassed oil at both stages were analyzed. To evaluate the effect of wave stimulation, the RTA (Rate Transient Analysis) provided by the Kappa Topaze software was applied instead of the commonly used DCA (Decline Curve Analysis) approach. Change in production rate after wave stimulation was used as the main criterion. Algorithm of determination of this parameter based on interpretation results was offered. The field experiment yielded the following results: in the Kynovskian-Pashiyan reservoirs with high water cut, oil production rates increased by some 6%; in addition, a significant increase in degassed oil viscosity was recorded suggesting that the by-passed oil was mobilized. In the Tournaisian reservoirs with low water cut developed at low borehole pressure, production rates did not change. Comparative analysis of pressure buildup curves did not show a somewhat pronounced change in the reservoir flow capacity.
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