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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
US471696014 Jul 19865 Ene 1988Production Technologies International, Inc.Method and system for introducing electric current into a well
US491123920 Abr 198827 Mar 1990Intra-Global Petroleum Reservers, Inc.Method and apparatus for removal of oil well paraffin
US51209351 Oct 19909 Jun 1992Method and apparatus for oil well stimulation utilizing electrically heated solvents
US52479946 Nov 199228 Sep 1993Method of stimulating oil wells
US540043021 Ene 199421 Mar 1995Method for injection well stimulation
US614270727 Ago 19977 Nov 2000Shell Oil CompanyDirect electric pipeline heating
US617102526 Mar 19969 Ene 2001Shell Oil CompanyMethod for pipeline leak detection
US617952326 Mar 199630 Ene 2001Shell Oil CompanyMethod for pipeline installation
US626440126 Mar 199624 Jul 2001Shell Oil CompanyMethod for enhancing the flow of heavy crudes through subsea pipelines
US631549723 Dic 199713 Nov 2001Shell Oil CompanyJoint for applying current across a pipe-in-pipe system
US663204716 Abr 200114 Oct 2003Board of Regents, The University of Texas SystemHeater element for use in an in situ thermal desorption soil remediation system
US668674520 Jul 20013 Feb 2004Shell Oil CompanyApparatus and method for electrical testing of electrically heated pipe-in-pipe pipeline
US668890025 Jun 200210 Feb 2004Shell Oil CompanyInsulating joint for electrically heated pipeline
US670701220 Jul 200116 Mar 2004Shell Oil CompanyPower supply for electrically heated subsea pipeline
US671401820 Jul 200130 Mar 2004Shell Oil CompanyMethod of commissioning and operating an electrically heated pipe-in-pipe subsea pipeline
US673980320 Jul 200125 May 2004Shell Oil CompanyMethod of installation of electrically heated pipe-in-pipe subsea pipeline
US681414620 Jul 20019 Nov 2004Shell Oil CompanyAnnulus for electrically heated pipe-in-pipe subsea pipeline
US69370308 Nov 200230 Ago 2005Shell Oil CompanyTesting electrical integrity of electrically heated subsea pipelines
US715031717 Mar 200419 Dic 2006Baker Hughes IncorporatedUse of electromagnetic acoustic transducers in downhole cement evaluation
US752587226 Feb 200428 Abr 2009Baker Hughes IncorporatedMethod and apparatus for cement bond evaluation using transversely polarized shear waves
US769737514 May 200713 Abr 2010Baker Hughes IncorporatedCombined electro-magnetic acoustic transducer