Wells – Processes – Distinct – separate injection and producing wells
Patent
1987-12-14
1989-05-09
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166274, 252 8554, E21B 4322
Patent
active
048280291
ABSTRACT:
A process for dissolving surfactants in miscible gaseous drive fluids is discussed. The poor solvent properties of these drive fluids are enhanced by the addition of a cosolvent which facilitates solubilization of the surfactant into the drive solvents. Solubilization of surfactants in the HLB range of 0 to 10 can be facilitated by the addition of less polar cosolvents. Surfactants of HLB range 10 to 20 will show improved solubility with more polar cosolvents. Surfactants with low solubility parameter values and low polarity will require minimal cosolvent addition. A miscible drive phase enriched with surfactant will show improved mobility in a subsurface, oil-bearing, formation due to the foaming action generated with in-place aqueous fluids.
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