They had a personal skills interview and then they had a complete technical interview.

First round interview on campus consisted of one 1.5 hr interview, the first half was behavioral, 2nd half was technical. Got a call almost 2 months later about a second round interview on site in Houston. Interview day consisted of two 45 minute technical interviews that were harder than the first round question. One of the questions was a petroleum engineering question that was pretty hard for me being mechanical, I think they were seeing if I could figure it out. The rest of the day was a few presentations about benefits etc, lunch, and a tour.