Patent ID: 7337845
Filing Date: 2008-03-04
Classification: E21B

Abstract:
1. In a method for removing deposits from a water well comprising an aquifer storage and recovery well, a water supply well, a barrier well, an injection well, a recharge well or a disposal well, horizontal well, or environmental recovery well and surrounding aquifer, the method comprising: a) providing said water well with a means for delivering energy to the water well for removing deposits, b) optionally using said energy delivery means to backflush in said water well, c) activating said means for delivering energy when deposit removal is required; d) providing energy to the well through said energy delivering means by delivering liquid carbon dioxide or a mixture of gaseous and liquid carbon dioxide to remove deposits from the well; e) allowing said liquid carbon dioxide or mixture of gaseous and liquid carbon dioxide to act to dissolve, detach, mobilize, and/or fluidize said deposits over a period of time in said well; f) inactivating said means and allowing the means to remain connected to the well until activation is required for deposit removal.