Pros
There are lot of highly intelligent, very interesting and hardworking people who are fun to work with. Excellent Training Programs. Potentially unlimited career opportunities. International assignments. Competitive compensation package.
Cons
A lot of people with poor or no managerial skills promoted to managers positions. As result such managers cannot motivate, inspire their teams and be a true leaders. Instead those managers don't care about people and little care about business but only care about their own objectives in order to achieve highest appraisal mark and move on. Schlumberger will be excellent company for you if you will have an excellent manager - open, honest, supportive, motivating, knowledgeable, inspiring and connected to his team, which is rare compare to selfish and egocentric careerists. Schlumberger lies about dual career support. It does not exist. Very difficult to achieve satisfactory work-life balance especially if you manage dual career in the family.