Mixed well steam drive drainage process
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United States of America Patent
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Jan 19, 1999
Issued Date -
N/A
app pub date -
Dec 8, 1994
filing date -
Apr 28, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
A thermal oil recovery process is disclosed for use in a heavy oil reservoir having a plurality of laterally separated, generally vertical wells whose use have left the reservoir characterized by a heated depletion zone, a channel, voidage, or mobility and communication. The process includes the steps of: drilling a well having a horizontal section and an opening therein that is located laterally between at least two of the vertical wells and at a depth within the lower part of the reservoir; injecting a steam through the two vertical wells to establish thermal communication with said horizontal well; and using the combination of steam drive and gravity drainage to recover oil from the reservoir through the horizontal well.
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