Addax Petroleum Well Improves Production 22% with SpeedStar SWD Drive, Cameroon | Schlumberger
Tech Report
Location
Cameroon, Africa, Offshore
Details

Africa
Offshore Cameroon

Operator
Addax Petroleum
 
Lithology
Sandstone
 
Casing size
7 5/8 in [194 mm]
 
Casing depth
4,330-ft [1,320-m] MD
 
Tubing size
3½ in [89 mm]
 
Pump seating depth
3,020-ft [920-m] MD
 
Deviation
Up to 49°
 
Perforation depth
3,280-ft [1,000-m] MD

Background
To produce oil from wells offshore Cameroon, Addax uses ESPs with variable speed drives (VSDs) to adapt to changing downhole conditions. However, current and voltage harmonic distortion from the VSDs reduced power efficiency and created vibration in the pumps, which limited the operating frequency of the pumps and therefore limited well production, and reduced the run life of the pumps.
Products Used

Addax Petroleum Well Improves Production 22% with SpeedStar SWD Drive, Cameroon

Sine wave drive technology reduces ESP vibration stress, enables operating frequency increase, and improves power efficiency

 
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Replacing the conventional 260-kVA VSD with a 390-kVA SpeedStar SWD drive in mid-November reduced the vibration stress on the ESP string from 13 gn to less than 1 gn . As a result, Addax was able to increase the operating frequency from 46 to 58 Hz and improve production by 22% (from 7,356 to 9,002 bbl/d [1,170 to 1,431 m3/d]) with minimal (6%) increase in motor temperature. The change also reduced power consumption (60.9 A at 58 Hz) compared with a similar offset, Well K-11 (60.7 A at 50 Hz).
Products Used

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