HOUSTON, April 9, 2018 /PRNewswire/ -- S&P Global Platts Analytics today announced the U.S. rig count for March 2018 was 1,095, up 18 (+2%) from February 2018, and up 194 (+22%) from March 2017. This rig count includes U.S. onshore, U.S. inland waters, and U.S. offshore Gulf...