Pros
Schlumberger puts a huge enphasis on training and career development for each individual and will always promote from within to those who want it. Co workers in the field make coping with the sometime long hours manageable due to the SLB culture. There's support for families and employees which is reassuring and the pay and benefits is great depending on where you work. In comparison to other companies there's a great opportunity here and one could climb to great heights.
Cons
I work in the field as a supervisor over cementing operations. This is an on call schedule so my hours are speratic to say the least. And when it's busy I'm barely home but when it's slow I could be at home for 3 days without any need to go into work. So it makes planning difficult especially in your first year. It's not for everyone the long hours, physical strain, sleep deprivation will effect most people and families. It can get dirty and tedious and really demand a strong work ethic.