OMICS International https://www.omicsonline.org/ 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. https://www.omicsonline.org/ArchiveOGR/currentissue-oil-gas-research.php Oil & Gas Research Volume 3, Issue 3 https://www.omicsonline.org/open-access/comparative-analysis-of-nigeria-petroleum-fiscal-systems-using-royalty-and-tax-optimization-models-to-drive-investments-2151-6200-1000145-95661.html Comparative Analysis of Nigeria Petroleum Fiscal Systems Using Royalty and Tax Optimization Models to Drive Investments Wahab L and Diji CJ https://www.omicsonline.org/open-access/study-of-verification-and-validation-of-standard-welding-procedure-specifications-guidelines-for-api-5l-x70-grade-line-pipe-weldin-2151-6200-1000147-98419.html Study of Verification and Validation of Standard Welding Procedure Specifications Guidelines for API 5L X70 Grade Line Pipe Welding Hafiz Abdul Ahad Qazi https://www.omicsonline.org/open-access/advances-in-the-possibility-of-utilising-construction-grade-cements-cgcs-for-oil-well-cementing-2151-6200-1000148-98420.html Advances in the Possibility of Utilising Construction Grade Cements CGCs for Oil Well Cementing Eric BroniBediako and Richard Amorin