Solvent Stimulation of Viscous Crude-oil Production.
Soc Petrol Eng AIME 42D Ann California Reg Mtg 1971 Nov; :11 pages
To improve both the rate and volume of production of viscous crude oils, the USBM made a study of solvents to stimulate production. Five laboratory methods were used to evaluate the effectiveness of several solvents in the stimulation of viscous oil production. These methods were (1) viscosity reduction, (2) gravity drainage production from sand columns, (3) displacement from capillary tubes, (4) effect of organic acids on crude oil viscosity and (5) hydrocarbon analysis. Solvents ranging from refinery cuts to chemical compounds were used with six California and one Kansas crude oils. Results indicated that small quantities of effective solvents greatly reduced the viscosity of viscous crude oils. The rate and volume of production of viscous crude oils by gravity drainage from laboratory sand columns were increased greatly by small quantities of effective solvents. It was also found that low molecular weight, aromatic hydrocarbon solvents effectively removed viscous crude oils from glass capillary tubes.
Soc. Petrol. Eng., AIME, 42D Ann. California. Reg. Mtg., Nov. 4-5, 1971, SPE 3680