It varies a lot by segment of the industry and the individual team/part of the company you're in.
I'm a geologist and I've worked for three of the majors. I've seen good work conditions and I've seen terrible. (This is all office-based work, too. Things are a _lot_ rougher in the field.)
Essentially all geologists are in the "upstream" side of things (i.e. finding oil/gas and getting it out of the ground). Upstream has three segments (exploration, development, and production), and the work-culture depends a lot on which one of those you're in.
At least in my experience, in exploration things are very schedule-driven. You work crazy hours all the time to meet arbitrary deadlines. Supposedly, we work a 9/80 schedule and get every other Friday off. No one is allowed to take those... It's 7-5 six days a week, and more when it's crunch time. Taking "vacation" means working from home or only coming in for half a day. We're required to code our vacation every year, but I've regularly seen people forced to work through 100% of their vacation time.
Development (oilfield development, not software) is typically a bit more paced. Most of the work will be on a very regular schedule, except for when you're responsible for a well that's being drilled. If you're sitting a well, you're on-call 24/7 for a few weeks. You will have lots of 10pm, 2am, and 6am conference calls and then go in and work a full day. However, you'll typically be told to not show up at the office for a week or so afterwards (that's always informal -- the majors all have strict no comp time rules).
The other segment of upstream is production. I've never worked production, so I can't comment there.
I'm currently in R&D (software development, actually), and it's much more relaxed. We have our own personal hell in terms of the amount of paperwork and meetings that are required to do _anything_, but the hours are more reasonable.
At any rate, the big companies are all effectively 20-50 semi-independent small companies, in my experience. The work culture between those small companies will vary wildly.
I'm a geologist and I've worked for three of the majors. I've seen good work conditions and I've seen terrible. (This is all office-based work, too. Things are a _lot_ rougher in the field.)
Essentially all geologists are in the "upstream" side of things (i.e. finding oil/gas and getting it out of the ground). Upstream has three segments (exploration, development, and production), and the work-culture depends a lot on which one of those you're in.
At least in my experience, in exploration things are very schedule-driven. You work crazy hours all the time to meet arbitrary deadlines. Supposedly, we work a 9/80 schedule and get every other Friday off. No one is allowed to take those... It's 7-5 six days a week, and more when it's crunch time. Taking "vacation" means working from home or only coming in for half a day. We're required to code our vacation every year, but I've regularly seen people forced to work through 100% of their vacation time.
Development (oilfield development, not software) is typically a bit more paced. Most of the work will be on a very regular schedule, except for when you're responsible for a well that's being drilled. If you're sitting a well, you're on-call 24/7 for a few weeks. You will have lots of 10pm, 2am, and 6am conference calls and then go in and work a full day. However, you'll typically be told to not show up at the office for a week or so afterwards (that's always informal -- the majors all have strict no comp time rules).
The other segment of upstream is production. I've never worked production, so I can't comment there.
I'm currently in R&D (software development, actually), and it's much more relaxed. We have our own personal hell in terms of the amount of paperwork and meetings that are required to do _anything_, but the hours are more reasonable.
At any rate, the big companies are all effectively 20-50 semi-independent small companies, in my experience. The work culture between those small companies will vary wildly.