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Title: Method for enhanced oil recovery

Abstract

The present invention is directed to an improved method for enhanced recovery of oil from relatively "cold" reservoirs by carbon dioxide flooding. In oil reservoirs at a temperature less than the critical temperature of 87.7.degree. F. and at a pore pressure greater than the saturation pressure of carbon dioxide at the temperature of the reservoir, the carbon dioxide remains in the liquid state which does not satisfactorily mix with the oil. However, applicants have found that carbon dioxide can be vaporized in situ in the reservoir by selectively reducing the pore pressure in the reservoir to a value less than the particular saturated vapor pressure so as to greatly enhance the mixing of the carbon dioxide with the oil.

Inventors:
 [1];  [1];  [2]
  1. (Morgantown, WV)
  2. (Chicago, IL)
Publication Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
863662
Patent Number(s):
US 4224992
Assignee:
United States of America as represented by United States (Washington, DC) NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; enhanced; oil; recovery; directed; improved; relatively; cold; reservoirs; carbon; dioxide; flooding; temperature; critical; 87; degree; pore; pressure; saturation; reservoir; remains; liquid; satisfactorily; mix; applicants; found; vaporized; situ; selectively; reducing; value; particular; saturated; vapor; greatly; enhance; mixing; oil recovery; critical temperature; improved method; carbon dioxide; vapor pressure; enhanced oil; saturated vapor; oil reservoir; enhanced recovery; pore pressure; selectively reducing; /166/

Citation Formats

Comberiati, Joseph R., Locke, Charles D., and Kamath, Krishna I.. Method for enhanced oil recovery. United States: N. p., 1980. Web.
Comberiati, Joseph R., Locke, Charles D., & Kamath, Krishna I.. Method for enhanced oil recovery. United States.
Comberiati, Joseph R., Locke, Charles D., and Kamath, Krishna I.. Tue . "Method for enhanced oil recovery". United States. https://www.osti.gov/servlets/purl/863662.
@article{osti_863662,
title = {Method for enhanced oil recovery},
author = {Comberiati, Joseph R. and Locke, Charles D. and Kamath, Krishna I.},
abstractNote = {The present invention is directed to an improved method for enhanced recovery of oil from relatively "cold" reservoirs by carbon dioxide flooding. In oil reservoirs at a temperature less than the critical temperature of 87.7.degree. F. and at a pore pressure greater than the saturation pressure of carbon dioxide at the temperature of the reservoir, the carbon dioxide remains in the liquid state which does not satisfactorily mix with the oil. However, applicants have found that carbon dioxide can be vaporized in situ in the reservoir by selectively reducing the pore pressure in the reservoir to a value less than the particular saturated vapor pressure so as to greatly enhance the mixing of the carbon dioxide with the oil.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1980},
month = {Tue Jan 01 00:00:00 EST 1980}
}

Patent:

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