06209641 is referenced by 22 patents and cites 8 patents.

Method and apparatus for producing a first zone through a wellbore while simultaneously injecting gas into a second zone through the same wellbore. The production stream is produced to the surface through a string of tubing where gas is separated therefrom. The separated gas and/or gas from another source is then mixed with a carrier fluid (e.g. produced water, etc.) to form a mixture which, in turn, is pumped down the well annulus and through a downhole separator (e.g. an inverted hydrocyclone) where at least a portion of the gas is separated from the mixture. The separated gas is injected into the second zone while the remaining mixture is commingled with the production stream before the combined streams flow to the surface through the tubing.

Title
Method and apparatus for producing fluids while injecting gas through the same wellbore
Application Number
9/430598
Publication Number
6209641 (B1)
Application Date
October 29, 1999
Publication Date
April 3, 2001
Inventor
Mark D Stevenson
Anchorage
AK, US
Agent
Albert C Metrailer
US
Assignee
Atlantic Richfield Company
CA, US
IPC
E21B 43/40
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