Pros
Most of the pro comments are true. I worked at Schlumberger for 18 years at three different locations. My efforts were rewarded with promotions and salary increase. I was personally recognized by three different presidents for "outstanding leadership" in 1980, 1988 and 1990. Most of the managers I worked under were good leaders, but of course a few had no business managing.
Cons
Schlumberger has joined the ranks of companies supporting worker compensation laws that have made lifetime medical benefits retroactively not worth the paper they are written on. See 04/28/2014 article in Texas Tribune concerning companies dropping lifetime coverage. After working at Schlumberger for 18 years and being rated as an outstanding employee, I was injured on the job. Schlumberger promised me lifetime medical care. After treating my injury for years without any issues, they have now arbitrarily dropped my medical coverage in the middle of treatment. They have refused to pay for any more treatment or or even pain medication. I have lost my home and am now totally disabled. I have no recourse due to Texas worker compensation laws. In a just world this would be criminal or at least a case of bad faith. Should you become injured at Schlumberger, do not trust them to honor written agreements for medical care.