Kieu Anh Trung (1), Nguyen Minh Quy (1), Hoang Long (1), Truong Van Dung (1), Le Thi Thu Huong (1), Pham Thi Thuy(2), Vu Huu Huy(2) 1Vietnam Petroleum Institute, 2Hoan Vu Joint Operating Company Email: trungka.epc@vpi.pvn.vn