Method of assisting the recovery of petroleum in vertically frac

Details Method of assisting the recovery of petroleum in vertically frac Method of assisting the recovery of petroleum in vertically frac

1992-10-05

1994-05-24

Suchfield, George A.

Wells

Processes

With indicating, testing, measuring or locating

166250, 166268, 1663051, E21B 4316, E21B 4700, E21B 4710

Patent

active

053140176

ABSTRACT:
The invention relates to assisting the recovery of petroleum from vertically fractured formations utilizing carbon dioxide gas to lower the interfacial tension between the gas and the petroleum in the vertical fractures and in the formation matrix adjacent the vertical fractures to cause vertical drainage of the petroleum down the fracture system. The invention also includes a method for identifying vertically fractured formations which may be particularly susceptible to such recovery with carbon dioxide gas using the capillary to gravity ratio (1/N.sub.B) to select formations having a value for such ratio of 0.2 or less.

REFERENCES:
patent: 4733725 (1988-03-01), Pittaway et al.
patent: 4742873 (1988-05-01), Craig, III
patent: 5042580 (1991-08-01), Cullick et al.
patent: 5111882 (1992-05-01), Tang et al.
Scale-Up of Miscible Flood Process Annual Report to DOE F. M. Orr Jr., Principal Investigator, Jan. 1991 (republished Jun. 1991).
SPE Paper No. 22947 Analysis of a Tertiary CO.sub.2 Flood Plot in a Naturally Fractured Reservoir by D. Beliveau and D. A. Payne.
SPE Paper No. 22594 Capillary Imbibition and Gravity Segregation in Low IFT Systems by D. S. Schechter, D. Zhou and F. M. Orr, Jr.
Miscible Flooding Industrial Affiliates Program, Project Review May 7, 1992 Department of Petroleum Engineering; School of Earth Sciences; Stanford University.
Miscible Flooding Industrial Affiliates Program, Project Review May 15, 1991 Department of Petroleum Engineering; School of Earth Sciences; Stanford University.
Miscible Flooding Industrial Affiliates Program, Project Review May 15, 1990 Department of Petroleum Engineering; School of Earth Sciences; Stanford University.

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