is defined as "simultaneous production" to the practice of producing two or more deposits, sand or strata (well-zones) simultaneously by the same production tubing, as opposed to the practice of sequential production "in which the well-zones are produced separately, one after the other. As long as the pressure (say the potential) of downhole production remains under pressure from the reservoir of each of the well-zones, these fluids contribute to the well. Only during periods of closure of the well, is when you could present cross-flow between the well-zones, based on pressure differentials (potential) between them. But like a well-zone could take fluids during the closure period, also would restore the volume well taken, once well production restarted. Importantly, the condition that there is compatibility of fluids from the well-zone, which is a prerequisite for proceeding with the simultaneous production.
From: http://www.petroleum.com.ve/revista/articulos.php?id=624
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