Patent ID: 8418768

Claim:
An apparatus for producing petroleum fluid from a multiple zones well, the apparatus comprising: a casing running downwardly from the ground surface into the vertically-spaced multiple production zones; a tubing string arranged within the casing whereby an annular space is formed between the said casing and tubing string; at least one sealing mechanism arranged on the tubing string and casing to seal the annular space above the production zones; and a tubular member arranged in the at least one sealing mechanism parallel to the tubing string and extends downwardly from above the at least one sealing mechanism then ends near the production zones, wherein the tubular member comprises at least one connecting means provided as passageway for connecting the tubular member to the tubing string at a depth below the sealing mechanism, at least one gas injection mechanism assembled to the tubing string below the at least one connecting means for injecting lifting gas to the production zones, and at least one opening/closing mechanism or a port installed to the tubing string above the production zones to allow unloaded petroleum fluid to enter the tubing string.