Wells – Processes – With indicating – testing – measuring or locating
Patent
1975-11-21
1976-09-14
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
73152, 166273, 166274, E21B 4900
Patent
active
RE0289639
ABSTRACT:
A method for determining the amount of residual oil remaining in an oil bearing formation after primary production which includes the sequential steps of:
A. logging the formation to obtain logging data measurements of the relative quantities of residual oil and formation water present in the formation;
B. injecting a sufficient amount of an oil miscible solution through the bore hole into the formation to displace substantially all of the residual oil in the formation surrounding the bore hole;
C. injecting a sufficient amount of water into the formation through the bore hole to displace substantially all of the oil miscible solution thereby rendering the formation being tested substantially 100 per cent water saturated; and
D. logging the formation for a second time to obtain logging data measurements which, when compared with the logging data measurements of the initial log indicate the amount of residual oil present in the formation, wherein said logging data measurements are obtained by employing a reservoir property logging apparatus selected from the group consisting of resistivity logging apparatus, sonic logging apparatus and density logging apparatus.
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patent: 3817328 (1974-06-01), Neuman
patent: 3825752 (1974-07-01), Murphy et al.
Fertl Walter H.
Reynolds Edward B.
Continental Oil Company
Novosad Stephen J.
Scott F. Lindsey
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