. Bulletin. w attempted toget the well under control by closingthe 12i-inch gate valve, but the shaleand sharp sand carried by the streamof gas cut out the seat of the valvewhile it was being closed. This gatehaving failed, there was no alternativeto letting the well blow until more fittings could be attached. After blowing foran hour, the drillers said that the 6-inch flow line became red hot for 2 feet atits end, due to the friction of the shale and sand on the pipe, and ignited theenormous stream of gas. This well had an estimated flow of 100,000,000 cubic feet of gasper day, but did not sh
. Bulletin. w attempted toget the well under control by closingthe 12i-inch gate valve, but the shaleand sharp sand carried by the streamof gas cut out the seat of the valvewhile it was being closed. This gatehaving failed, there was no alternativeto letting the well blow until more fittings could be attached. After blowing foran hour, the drillers said that the 6-inch flow line became red hot for 2 feet atits end, due to the friction of the shale and sand on the pipe, and ignited theenormous stream of gas. This well had an estimated flow of 100,000,000 cubic feet of gasper day, but did not show signs of oil or gas until the well was bailedfor a test. If the sand had not been tested it is likely that this biggas-producing sand would have been cased off. LOSSES CAUSED BY IMPROPER DRILLING METHODS. Losses are caused by improper drilling methods which may resultin the oil or gas escaping to overlying porous formations or to the »8 Midways midnight sun: Standard Oil BuUetin, August, 1919, pp. FiGUBE 30.—Sketch showing entrance ofwater into oil sand from withdrawal ofcasing from an abandoned well withoutplacing a plug between oil and watersands. After Bull. 82, California StateMining Bureau, p. 13. BUREAU OF MINES BULLETIN 195 PLATE XXII
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