30 min interview at a conference. Recruiter told me immediately that I made it to the 2nd round. They flew me to TX two weeks after that for a group interview. Interview atmosphere was very laid back and relaxing. They gave presentations on the different company segments, spoke about their experiences so far, then I gave a group presentation on topics they had given us the week before. The whole thing started a 6pm and ended at 3am. Next day we were up at 7am for breakfast and drove to a site at 8am. Then lunch, then a 10 min exit interview. After the exit interviews we went for dinner at a steakhouse, recruiters drank a bit too much...to the point that I thought "Are they serious". I encourage you to be honest about your interest in SLB, ask questions, and try to get all recruiters to notice you.