Process for sequentially applying SAGD to adjacent sections of a petroleum reservoir
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United States of America Patent
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Aug 15, 2006
Issued Date -
N/A
app pub date -
Aug 25, 2004
filing date -
Oct 26, 1999
priority date (Note) -
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Abstract
Steam assisted gravity drainage ('SAGD') is practised in a first section of a reservoir containing heavy oil. When steam/oil ratio rises sufficiently, steam injection into the first section is curtailed or terminated. Non-condensible gas is then injected into the section to pressurize it and production of residual oil and steam condensate is continued. Concurrently with pressurization, SAGD is practised in an adjacent reservoir section. As a result, some of the residual oil in the first section is recovered and steam loss from the second section to the first section is ameliorated.
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