MOBILITY CONTROL IN LOW PERMEABILITY RESERVOIRS

摘要

Improved oil recovery from reservoirs having average permeabilities less than 100 md is obtained by injecting into and displacing through the reservoir an aqueous mobility buffer containing an N-sulfohydrocarbon-substituted acrylamide polymer. A micellar solution slug is preferably injected ahead of the buffer slug. This polymer has a reasonably high intrinsic viscosity and permits high injection rates. "Plugging" of the reservoir is minimal at worst.