Wells – Processes – With indicating – testing – measuring or locating
Patent
1984-10-29
1986-01-28
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166261, E21B 4700, E21B 43243
Patent
active
045665362
ABSTRACT:
An injection well used in an in-situ combustion oil recovery process using a high oxygen concentration gas is completed with dual tubing strings to conduct the oxygen-containing gas and nitrogen separately down the well. The gases are mixed after they leave their separate tubing strings and enter the formation through perforations in the casing. If the bottomhole temperature of the well increases to a specific level, injection of the oxygen-containing gas is terminated and injection of the nitrogen is increased to a maximum amount until the bottomhole temperature decreases to a desired level for resuming in-situ combustion. In addition, injection of water into the bottom of the well is available as a back-up in the event that injection of the nitrogen does not lower the bottomhole temperature to the desired level. The use of the separate tubing strings for nitrogen and oxygen flow permits a faster bottomhole response to be obtained if undesired temperature increases take place downhole.
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Gilman Michael G.
Keen Malcolm D.
Kisliuk Bruce M.
McKillop Alexander J.
Mobil Oil Corporation
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