Laboratory study of heavy oil recovery using polymer and solvent
Technical Report
·
OSTI ID:7281561
An enhanced heavy oil recovery process using polymer and solvent was laboratory tested. The objectives were to increase oil recovery by (1) controlling bypassing of injected fluids through high permeability sands by the use of polymer and multivalent ion solutions, and (2) increasing oil mobility using solvent. Crude oils used for testing varied from 20.8 to 13.6/sup 0/ API gravity. Corresponding viscosities were 80 to 3,500 centipoise. Test columns were saturated with crude oil and then waterflooded until the produced water-oil ratio was a minimum of 20. Waterflooding opened up flow channels in the high permeability sand while bypassing most of the oil in the low permeability sand; a common field problem associated with heavy oil recovery. Various combinations of polyacrylamide thickened water, aluminum citrate solution, and solvent were then injected. Waterflooding was then resumed to drive the injected fluids through the columns. Results show that for an 1,100 cp viscosity crude oil, 32 percent additional oil was recovered after an initial waterflood recovery of 24 percent. Similarly, recoveries for an 80 cp crude were 24 percent additional and 38 percent by waterflood. For a 3,500 cp crude, recoveries were 31 percent additional and 18 percent by waterflood.
- Research Organization:
- Energy Research and Development Administration, San Francisco, Calif. (USA). San Francisco Energy Research Center
- OSTI ID:
- 7281561
- Report Number(s):
- SFERC/RI-76/1
- Country of Publication:
- United States
- Language:
- English
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