EntityQ972635· pop 12· linked from 334 articlesChristmas treeSign in to saveassembly of valves, spools, and fittings used to regulate the flow of pipes in an oil wellConnectionsoil wellEntityBig OilEntityCaspian SeaEntitypetroleumEntityInternational Standard Book NumberEntityPersian GulfEntityOPECConceptGulf of MexicoEntitynatural gasEntityGazpromEntityShellCompanyExxonMobilPublic companyTotalEnergiesCompanyBPCompanySaudi AramcoCompany1973 oil crisisEntityChevron CorporationEntityoil refineryEntityvalveEntityoil shaleEntityCategoriesOil wellsPetroleum production