(received; accepted) PACS. 47.55Mh – Flows through porous media. PACS. 47.55Kf – Multi-phase and particle-laden flows. PACS. 05.40−a – Fluctuation phenomena, random processes, noise, and Brownian motion. PACS. 07.05Tp – Computer modeling and simulation. Abstract. – We investigate the burst dynamics during drainage going from low to high injection rate at various fluid viscosities. The bursts are identified as pressure drops in the pressure signal across the system. We find that the statistical distribution of pressure drops scales according to other systems exhibiting self-organized criticality. The pressure signal was calculated by a network model that properly simulates drainage displacements. We compare our results with corresponding experiments. Since the early 1980s physicists have paid attention to the complex phenomena observed when one fluid displaces another fluid in porous media. The papers that have appeared in the literature mostly refer to the rich variety of displacement structures that is observed due to different fluid properties like flow rate, viscosity, interfacial tension, and wettability. Th
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