CORRECTED - CORRECTED-Samsung Eng wins $2.6 bln order from Algeria

(Corrects site of facility in first paragraph to "Skikda" from "Akikda")

SEOUL, July 6 (Reuters) - Samsung Engineering Co (028050.KS) said on Monday that it secured a $2.6 billion order from Algeria's state-owned energy group Sonatrach to increase and improve the refinery facility in Skikda, Algeria.

The order was the single-biggest overseas project for a South Korean contractor, it said in a regulatory filing. (Reporting by Seo Eun-kyung; Editing by Matthew Lewis)