A worker killed in an oilfield accident in North Dakota died of chest and abdominal injuries, according to the Associated Press. http://www.minotdailynews.com/page/content.detail/id/572623/Man-s-oil-field-death-in-ND-ruled-an-accident.html?nav=5583 The North Dakota Medical Examiner’s Office Tuesday released the cause of death of Halliburton employee Mike Krajewski, 49,…