M. P. Andrews No. 1, drilled in 1911, reached oil sands at 920 feet and first flowed oil in March 1912 at a rate of 10 barrels a day. Production in this shallow sand development area fell off when oil prices dropped, but rose after other pools in the region were tapped from 1916 to 1921. Since then, Archer County has become one of the state's most productive oil counties. The Hull-Silk-Sikes Well in 1939 opened a major field. More than 333 million barrels of crude oil have been produced by the county since 1911, with Andrews No. 1 still pumping.