Qatar Petroleum and ConocoPhillips [NYSE:COP] this week signed a Statement of Intent (SOI) regarding the construction of a gas-to-liquids (GTL) plant in Ras Laffan, Qatar. The agreement was signed by Abdulla Bin Hamad Al-Attiyah, Second Deputy Premier and Minister of Energy and Industry of Qatar on behalf of Qatar Petroleum and by Jim Mulva, ConocoPhillips…