Transporting mobility control agents to high permeability zones

Details Transporting mobility control agents to high permeability zones Transporting mobility control agents to high permeability zones

E - Fixed Constructions

21

B

E21B 43/16 (2006.01) C09K 8/594 (2006.01) C09K 8/60 (2006.01)

Patent

CA 2058812

A process for improved delivery of mobility control agents. The drive solvent is designed such that the plugging agent, e.g. surfactant or polymer, is soluble in the drive solvent under the injection conditions of temperature and pressure but is substantially insoluble under the conditions of temperature and pressure in the formation. Typically, miscible drive solvents have more favorable solvent properties at the low injection temperature than at the higher formation temperature. Preferably, solute solubility in miscible drive solvents is increased by the use of appropriate cosolvents. Cosolvent concentration is maintained below the amount needed for solute solubility at reservoir temperatures so that the solute will drop out of solution at some increased temperature depending on the concentration of the cosolvent added to the primary drive solvent.

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