With high pace of Oil Industry technology development we need to know and remember more and more terms, both new and old. Young industry professionals may not know what terms were used in the oil patch 20-30 years ago, and those at retirement age may not be aware on new technologies' expressions. This applications will help anyone having any relation to the oil patch. The terms and abbreviations listed in Petroleum Glossary, are mostly used in Exploration and Production of Oil Industry (Upstream). Over 6,500 words, abbreviations and expressions.