29 Jan '12, 12pm

Tech Talk - Oil production from Western Siberia

There are two basic reservoir conditions that lead to high water cuts. First, as a water drive oil reservoir is produced the oil/water interface slowly rises as the oil is withdrawn. Akin to salad oil floating on top the vinegar. Eventually the percentage of water increases to the point where the net oil production is too little to justify the LOE (lease operating expense) and the field is abandoned. Though not as perfect as depicted in an engineering book the recovery is fairly uniform across the field. Second, a producing well can “cone” water: Instead of the water interface moving up uniformly across reservoir it moves upwards much faster below the well. Thus instead of taking years for water cut to increase it can begin in just weeks or months. Two common causes for coning: the oil mobility is low (often due to viscosity/thickness) or the well is produced at too high a...

Full article: http://www.theoildrum.com/node/8886

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