By Pooja Menon Aug 21 (Reuters) – U.S. oil and gas producer ConocoPhillips (COP.N) said on Thursday it would secure 4 million tonnes per annum of liquefied natural gas from Sempra’s (SRE.N) Port Arthur LNG Phase 2 project in Texas to serve key global markets. Commercial activity in the U.S. LNG sector has picked up … Read more