wOBA = (Offensive event * constants offensive value) / (PA – IBB)
The wOBA is a variant of OBP (you reach the base or not) so the park factor is not present in Eq....The wOBA tells us how productive were your offensive events in terms of runs.
Billy Butler .380 OBP (26 2B, 14 HR) = .350 wOBA
Chris Davis .374 OBP (41 2B, 51 HR) = .426 wOBA