this point solvent stimulation is terminated and production is continued by the water drive until there is a breakthrough of water at the production well 18 cyclic solvent stimulation provides not only immediate production increases but also will encourage movement of the flooded oil toward the producing well by providing a pressure sink the selection of a suitable miscible solvent for stimulation at the production well will be obvious to a person skilled in the art having in mind the desire to achieve the desired dilution of the reservoir oil by way of example suitable solvents are the same as the flooding solvent injected into the lower portion of the reservoir as previously disclosed for the purpose of simplicity in describing the invention reference has been made to only one injection well and one production well however it will be recognized that in practical application of the invention a plurality of injection wells along the water oil interface line of the formation and a plurality of production wells may be used and in most cases will be utilized while the embodiment of the invention described above and illustrated in the drawings constitute the best mode contemplated for carrying out the invention it will be apparent that various modifications may be practiced without departing from the spirit of the invention thus the water can be injected into the water zone through a second injection well completed into the water zone at a point different from the well through which the solvent was injected if there.