Oil Rig Gusher, Petroleum Derrick Tower. Flat Vector Icon illustration. Simple black symbol on white background. Oil Rig, Petroleum Derrick Tower sign design template for web and mobile UI element. Oil Rig Gusher, Petroleum Derrick Tower. Flat Vector Icon illustration. Simple black symbol on white background. Oil Rig, Petroleum Derrick Tower sign design template for web and mobile UI element.