Abstract

ABSTRACT In 1984 the 10-Pattern steamflood was expanded upward into two drive zones overlying the original steam-flooded sands. Neutron and temperature logs from new wells associated with the expansion project showed heating and unexpected liquid depletion in the target sands. This depletion resulted in low pressure and temperature steam zones forming in these sands. In the third year of the project a heating analysis using data from observation wells indicated that the drive zones were thermally mature at the low steam zone temperatures. As a result of the analysis, steam injection into one of the drive zones was changed to hot water and steam injection rate into the other, less mature, drive zone was reduced by 70 %.

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