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Repressuring is the method by which the pressure inside the crude oil well is increased so as to increase the output of the well. Normally pumping out crude oil from a reservoir causes its pressure to drop which further reduces pumpability. Returning the natural gas or other inert gases to the oil well increases the pumpability of the crude present inside the well by decreasing its viscosity and density. In one instance, slower rate of oil production and recycling of natural gas at 9.6 MPa enabled a net recovery of 70% of the oil originally present. It is also to be noted that although recovery can to increased even by the recycling of air, it is seldom used because it cause an inferior quality of product. Instead carbon-dioxide or natural gas itself is used so as to not only increase the recovery from the oil well but also to maintain the high quality of the product.
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