The drop in Texas rig count alone should account for that number, but I’m guessing tha is just the lay-offs of directs by the client companies. I’ve been told Apache (Exxon’s upstream drilling company) laid off half or their directs.
Apache is not part of ExxonMobil. They are an independent company.
http://www.apachecorp.com/About_Apache/History/index.aspx