The ability to control solvent placement is critical to the success of any tertiary miscible flood in a stratified reservoir. In 1989, Shell Canada implemented a hydrocarbon flood in a heterogeneous Devonian reef at Virginia Hills. Injection profiles in this field are dominated by high permeability streaks. Since the miscible flood began, injection profiles have been improved using both mechanical methods and chemical blocking agents, resulting in increased oil and decreased solvent production.

Nine wells have been completed with mechanical profile control equipment. Multi-packer completions with different-sized- orifice valves allow control of injection volumes into each layer. Mechanical design details are presented and resulting field performance is discussed.

The philosophy and design of chemical profile control treatments are discussed. Prior to implementing chemical profile control, industry experience was reviewed and modified to improve the probability of success. The details of three chemical treatments are given in the paper.

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