Oldland's first win in five months seemed to breed confidence and at times they outplayed the Somerset side who knew a win would take them into fifth place.
The O's took the lead on 22 minutes when Joe Galsworthy was brought down in the penalty box and Tom Hutton converted the penalty for his eighth goal of the season.
Wellington equalised on 66 minutes with a header at the far post but there was no further score and Dale Dempsey's men returned home with a great point, a boost ahead of Saturday's home clash with Westbury United.
Team: Perry, Smallman, Clement, Nicholls, Hendy, Greenwood, Hutton, Robson, Hart, Shopland, Galsworthy
Subs: Planter & Carter (used), Winstone (not used)