OMICS International OMICS International is a scientific organization that drives the progress of research through open access journals and organizes international conferences, The best in science news, commentary, and research. Oil & Gas Research Volume 3, Issue 3 Comparative Analysis of Nigeria Petroleum Fiscal Systems Using Royalty and Tax Optimization Models to Drive Investments Wahab L and Diji CJ Study of Verification and Validation of Standard Welding Procedure Specifications Guidelines for API 5L X70 Grade Line Pipe Welding Hafiz Abdul Ahad Qazi Advances in the Possibility of Utilising Construction Grade Cements CGCs for Oil Well Cementing Eric BroniBediako and Richard Amorin