Methods to reduce the water saturation in the region near the well of an underground formation having a shaft.And to improve the injectivity of a primary solvent in the region near the pit of an underground formation having a shaft

摘要

Methods to reduce the water saturation in the region near the well of an underground formation having a shaft.And to improve the injectivity of a primary solvent in the region near the pit of an underground formation having a pit ".This invention provides a method to reduce the water saturation in the region next to the well.Among several possibilities of treatment of shaft, one application of the invention increases the proportion of the injectivity of a substantially non-aqueous fluid in a subterranean formation.The preferred method uses this invention to increase gas injectivity of solvent in a formation that contains oil to increase the quantity and / or proportion of recovery of oil from the formation.The method includes injecting a second fluid in the region near the well of injection well to displace at least a portion of the water in that region.The displacement of the water and the displacement of the secondary fluid subsequ00b3ente allows maximum injectivity in relation to the primary solvent is injected for the recovery of the oil.