The political economist emerged the standard bearer of the party at a parallel governorship primary organised by the Chief Cyril Ogodo-led factional State Working Committee of the party in Asaba, the state capital.
The primaries started on Sunday and ended in the early hours of Monday.
The result was declared by the returning officer, Elder Favour Adibor in Asaba on Monday.
Pat polled 2,486 votes to defeat three other aspirants for the governorship ticket of the APC at the exercise which was generally peaceful.
A former Speaker of the State House of Assembly, Engr. Victor Ochei, recorded 801 to come a distant second while Dr. Cairo Ojougboh, a former National Deputy Chairman (South-South) of the Peoples Democratic Party, PDP, scored 368 to come third.
Chief Great Ogboru came fourth with 106 votes. A total of 3, 755 votes were cast by delegates.