DUBAI, April 15 — Qatar Petroleum has invited three groups to bid for engineering procurement and construction packages on liquefied natural gas (LNG) mega-trains as it expands production at its North Field reservoir, the company said in a statement today. The first group invited is a joint venture between Chiyoda Corporation and Technip France S.A., the second comprises JGC Corporation and Hyundai Engineering and Construction Co. Ltd and the third Saipem S.p.A, McDermott Middle East Inc. and CTCI Corporation 19. — Reuters