METHODS FOR IMPROVING THE SWEEP EFFICIENCY OF GAS INJECTION

摘要

A method for recovering oil from a subterranean, hydrocarbon-bearing formation includes at least one injection well and injecting a carrier fluid including a diverting agent into a high permeability pathway within the formation. An activating fluid is injected into the high permeability pathway within the formation, resulting in the precipitation or swelling of the diverting agent. The permeability of the high permeability pathway is decreased within the formation containing the diverting agent to a permeability less than the permeability of the adjacent areas of the formation. The carrier fluid may have a predetermined residence time within the formation prior to injecting an activating fluid; the step of injecting a carrier fluid comprising a diverting agent and injecting an activating fluid may be repeated. A mineralization fluid may be injected that is oversaturated or becomes oversaturated upon interacting with the acid gas that causes mineral precipitation to seal off high-permeability pathways.

主权项

1. A method for recovering oil from a subterranean, hydrocarbon-bearing formation comprising at least one injection well, the method comprising:
injecting a carrier fluid comprising a diverting agent into a high permeability pathway within the formation; injecting an activating fluid into the high permeability pathway within the formation, wherein the activating fluid results in the precipitation or swelling of the diverting agent; decreasing the permeability of the high permeability pathway within the formation containing the diverting agent to a permeability less than the permeability of the adjacent areas of the formation.