METHOD TO REDUCE WATER SATURATION IN NEAR-WELL REGION

摘要

This invention provides a method for reducing the water saturation in the ne ar- well region. Along with various well treatment possibilities, one applicatio n of this invention increases the injectivity rate of a substantially nonaqueo us fluid into a subterranean formation. The preferred embodiment uses this invention to increase the injectivity of solvent gas into an oil-bearing formation for enhancing the amount and/or rate of oil recovery from the formation. The method includes injecting a second fluid into the near-well region of the injection well to displace at least a portion of the water fro m that region. Displacement of the water and subsequent displacement of the secondary fluid allow maximum injectivity for the primary solvent being injected for oil recovery.