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Effect of clay content in rock on oil extraction under alkaline seam conditions

Journal Article:

Abstract

When oil beds are flooded with alkaline solutions, the alkaline concentration in the solution can be significantly reduced as a result of the interaction between clay and alkali. Large losses of alkali in the bed can render the flooding method ineffective. Experimental studies were conducted on porous media containing up to 25% clay at a constant permeability of 1 D in order to determine the oil extraction indices for clay-containing rock. Constant permeability is maintained by using clays, marshalite, and quartz sand in various proportions. Oil having a viscosity of 99.17 sP, and containing a large amount of surfactants, including 1.1% naphthenic acid, was extracted by fresh water and a 0.25% solution of NaOH. The extraction of oil by fresh water and NaOH solution from quartz sand indicated the advantage of using alkaline solutions. The extraction coefficient increased by 11% with the use of this method. As clay is added to the sand, the extraction coefficient decreases, and is reduced to 12.7% when the clay content reaches 25%. Nevertheless, a comparison of data obtained for quartz sand with fresh water on a porous medium containing 25% clay with an alkaline solution, indicates that the extraction coefficient is just 1.5% lower  More>>
Publication Date:
Jan 01, 1978
Product Type:
Journal Article
Reference Number:
EDB-79-067296
Resource Relation:
Journal Name: Nefteprom. Delo; (USSR); Journal Volume: 7
Subject:
02 PETROLEUM; OIL WELLS; CAUSTIC FLOODING; AQUEOUS SOLUTIONS; CLAYS; ENHANCED RECOVERY; OIL FIELDS; PERMEABILITY; POROSITY; QUANTITY RATIO; RESERVOIR ROCK; SODIUM HYDROXIDES; ALKALI METAL COMPOUNDS; DISPERSIONS; FLUID INJECTION; GEOLOGIC DEPOSITS; HYDROGEN COMPOUNDS; HYDROXIDES; MINERALS; MIXTURES; OXYGEN COMPOUNDS; PETROLEUM DEPOSITS; RESOURCES; ROCKS; SODIUM COMPOUNDS; SOLUTIONS; WATERFLOODING; WELLS; 020300* - Petroleum- Drilling & Production
OSTI ID:
6154260
Country of Origin:
USSR
Language:
Russian
Other Identifying Numbers:
Journal ID: CODEN: NDTSA
Submitting Site:
TIC
Size:
Pages: 3-5
Announcement Date:

Journal Article:

Citation Formats

Vezirov, D Sh, Gorbunov, A T, Kasimov, Sh A, Kashchavtsev, V E, and Tairov, N D. Effect of clay content in rock on oil extraction under alkaline seam conditions. USSR: N. p., 1978. Web.
Vezirov, D Sh, Gorbunov, A T, Kasimov, Sh A, Kashchavtsev, V E, & Tairov, N D. Effect of clay content in rock on oil extraction under alkaline seam conditions. USSR.
Vezirov, D Sh, Gorbunov, A T, Kasimov, Sh A, Kashchavtsev, V E, and Tairov, N D. 1978. "Effect of clay content in rock on oil extraction under alkaline seam conditions." USSR.
@misc{etde_6154260,
title = {Effect of clay content in rock on oil extraction under alkaline seam conditions}
author = {Vezirov, D Sh, Gorbunov, A T, Kasimov, Sh A, Kashchavtsev, V E, and Tairov, N D}
abstractNote = {When oil beds are flooded with alkaline solutions, the alkaline concentration in the solution can be significantly reduced as a result of the interaction between clay and alkali. Large losses of alkali in the bed can render the flooding method ineffective. Experimental studies were conducted on porous media containing up to 25% clay at a constant permeability of 1 D in order to determine the oil extraction indices for clay-containing rock. Constant permeability is maintained by using clays, marshalite, and quartz sand in various proportions. Oil having a viscosity of 99.17 sP, and containing a large amount of surfactants, including 1.1% naphthenic acid, was extracted by fresh water and a 0.25% solution of NaOH. The extraction of oil by fresh water and NaOH solution from quartz sand indicated the advantage of using alkaline solutions. The extraction coefficient increased by 11% with the use of this method. As clay is added to the sand, the extraction coefficient decreases, and is reduced to 12.7% when the clay content reaches 25%. Nevertheless, a comparison of data obtained for quartz sand with fresh water on a porous medium containing 25% clay with an alkaline solution, indicates that the extraction coefficient is just 1.5% lower even in the presence of such a large amount of clay. Consequently, alkaline flooding should still be given preference over the usual methods under specific conditions and where the rock has a comparatively large amount of clay, in view of all the basic factors that influence the extraction process. The results obtained can be used for selecting alkaline concentration in evaluating the efficiency of flooding oil beds with alkaline solutions. 2 figures, 2 tables.}
journal = {Nefteprom. Delo; (USSR)}
volume = {7}
journal type = {AC}
place = {USSR}
year = {1978}
month = {Jan}
}