Pros
Great chances of moving up in your Career, Great benefits, Pay depending on Country of residence, Often Extremely nice co-workers, Travel to some of the most remote regions of the world. Training & if your immediate boss likes you then training in other sectors as well. Great atmosphere on sites. Help & Offices almost anywhere in the world.
Cons
Seismic "Engineers" often overly cocky because they believe they were hand picked by Schlumberger from University. You are just a number, don't be fooled into thinking you are special in the grand scheme of the company. Often no direction from management. Management is organised in such a way that you will never be able to talk to anyone who has the power or ability to change what you want. Little chance of moving into another field within the company. I have never met the managers above my direct managers. RED TAPE! No idea who the CEO is at times occasionally see a photo, never met him.