First you have to submit your cv online. They will sort out CVz and call for interview. There are two interviews roughly. First interview is by HR department and the later one is by the relevant department for which the HR department refer you.
I applied through an employee referral. The process took 3 weeks. I interviewed at SLB (Houston, TX) in Jun 2012
Interview
Submitted online application and got a call within a week. It was a telephonic HR interview. Questions were based on resume and standard questions on strengths and weaknesses. He asked if i would be interested hardware design and nothing out of the blue or unexpected.
Interview questions [1]
Question 1
Very standard HR interview. No puzzles no surprises.