2 stage assessment, 1 group and 1 individual. If you passed the first stage then you will get to the second one. The group assessment was like a case study.

I had two rounds of interviews. First round was with a woman from HR. Second round lasted several hours with presentations and a panel of 3 people asking me questions. After this, I was told I would hear back within 2 weeks. I sent several follow-up emails but was ignored for 2.5 months. I was eventually offered the job. The recruiter was the most useless person I have ever met. She could not answer basic questions about the job. When I tried to reach out to her, I was repeatedly ignored. Obviously, I ended up declining the offer. Keep in mind, at SLB you will likely just be another number.