The paper provided a selection proposal drilling rig in expand field development drilling at Vietnam deep sea water. By reviewing some of the engineering aspect actual deep water exploiration stategy of Petro Vietnam National Oil and Gas Group, the technology advancement, innovations, and challenges in drilling rig. An overview of TAD technology will bring benefit for potienal oil and gas location at deep sea water of Vietnam offshore. The combinion between semi-submersible and stability of Jack up rig to demonstrate effective and bring a lot of advantage rather than conventional drilling rig. Semi-submersible Tender Assisted Drilling RIG (SSTD or TAD) will be a good solution for selection of drilling rig to eany out oil and gas field development with water depth from 130 m to 1500 m. In the event of semi-submersible selection is not cost effective with high rental cost, high intinial investment cost and more expensive than TAD and technical solution as well.