I was at diamondback h&p 468 taking invoices. as i drove up i noticed a cloud coming from the nw. i hollered at the company men to look at this cloud. we are standing still under porch taking pictures of this cloud. men come down from the drilling rig, i took 3 pics, not moving from the porch. the black cloud moved towards the rig, it started lightning, no thunder and it headed toward garden city. we did not notice the lights until the next morning. a couple of rough necks were standing at the bottom of the rig , 50, 60 yards where i was standing on pircch. they took pics as well. they have the same 3 blue/green triangle in photos too!!