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51314-3945-Corrosion Testing of Stimulation Acidizing Packages on High Strength Corrosion Resistant Tubing Alloys for High Pressure Deep Water Wells

Picture for Corrosion Testing of Stimulation Acidizing Packages on High Strength Corrosion Resistant Tubing Allo
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Product Number: 51314-3945-SG
ISBN: 3945 2014 CP
Author: Lucrezia Scoppio
Publication Date: 2014
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 Authors: Lucrezia Scoppio1) Perry Nice2) Giuseppe Mortali3) Luciana Intiso3) Eugenio Lo Piccolo3) Håvard Nasvik2) Juanita Cassidy4) Hisashi Amaya5)1) Pipe Team srl via Resistenza 2Vizzolo Predabissi Milano 20200 Italy2) Statoil ASA 4035 Stavanger Norway3) Centro Sviluppo Materiali SpA Via di Castel Romano 100 00128 Roma Italy4) Halliburton Duncan Technology Center P.O. Drawer 1431 Duncan Oklahoma 73536-0426 USA5) Nippon Steel & Sumitomo Metal Corporation 1850 Minato Wakayama 640-8555 JapanCompletion designs for deep water high pressure wells commonly require corrosion resistant alloy (CRA) tubing grades with minimum specified yield strengths of 125 ksi to resist against high tensile and collapse loads as well as corrosive reservoir fluids. The types of alloys considered for such well designs and corrosive environments are 17Cr (17Cr-5Ni-2.5Mo-2.5Cu-lowC) and super duplex stainless steels (UNS S39274).On completion of these wells the perforated pay zone may require acid stimulation to remove and clean up debris and therefore permit unrestricted hydrocarbon flow. Also later in the well life carbonate scale may deposit in the completion which needs to be removed with a scale dissolver treatment. A number of different acid stimulation packages are available for this purpose but they are considered corrosive. So they require corrosion inhibitor packages to prevent severe corrosion damage to the wells CRA tubing and liner sections.In this paper acid based treatment chemicals have been tested for their corrosiveness on the CRA materials 17Cr and super duplex stainless steels. A corrosion testing program aimed at evaluating these stimulation acid/scale dissolver packages was designed and performed to determine which package(s) were least corrosive and acceptable for use with wells constructed with 17Cr and super duplex stainless steels tubulars.Laboratory exposure corrosion tests were carried out in autoclaves under a nitrogen blanket at temperatures between 70 to 130 °C.  The stimulation acid/scale dissolver packages consisted of 10%HCl 15%HCl and 9%HCl plus 1%HF including corrosion inhibitors and intensifiers. The corrosion resistance of the tested materials was evaluated in terms of mass loss selective and localized corrosion.The range of applicability and compatibility against the tested alloys was defined.Key words: CRA Deep Water High Pressure Wells Matrix acidizing 17Cr stainless steel duplex stainless steel UNS S39274. 
 Authors: Lucrezia Scoppio1) Perry Nice2) Giuseppe Mortali3) Luciana Intiso3) Eugenio Lo Piccolo3) Håvard Nasvik2) Juanita Cassidy4) Hisashi Amaya5)1) Pipe Team srl via Resistenza 2Vizzolo Predabissi Milano 20200 Italy2) Statoil ASA 4035 Stavanger Norway3) Centro Sviluppo Materiali SpA Via di Castel Romano 100 00128 Roma Italy4) Halliburton Duncan Technology Center P.O. Drawer 1431 Duncan Oklahoma 73536-0426 USA5) Nippon Steel & Sumitomo Metal Corporation 1850 Minato Wakayama 640-8555 JapanCompletion designs for deep water high pressure wells commonly require corrosion resistant alloy (CRA) tubing grades with minimum specified yield strengths of 125 ksi to resist against high tensile and collapse loads as well as corrosive reservoir fluids. The types of alloys considered for such well designs and corrosive environments are 17Cr (17Cr-5Ni-2.5Mo-2.5Cu-lowC) and super duplex stainless steels (UNS S39274).On completion of these wells the perforated pay zone may require acid stimulation to remove and clean up debris and therefore permit unrestricted hydrocarbon flow. Also later in the well life carbonate scale may deposit in the completion which needs to be removed with a scale dissolver treatment. A number of different acid stimulation packages are available for this purpose but they are considered corrosive. So they require corrosion inhibitor packages to prevent severe corrosion damage to the wells CRA tubing and liner sections.In this paper acid based treatment chemicals have been tested for their corrosiveness on the CRA materials 17Cr and super duplex stainless steels. A corrosion testing program aimed at evaluating these stimulation acid/scale dissolver packages was designed and performed to determine which package(s) were least corrosive and acceptable for use with wells constructed with 17Cr and super duplex stainless steels tubulars.Laboratory exposure corrosion tests were carried out in autoclaves under a nitrogen blanket at temperatures between 70 to 130 °C.  The stimulation acid/scale dissolver packages consisted of 10%HCl 15%HCl and 9%HCl plus 1%HF including corrosion inhibitors and intensifiers. The corrosion resistance of the tested materials was evaluated in terms of mass loss selective and localized corrosion.The range of applicability and compatibility against the tested alloys was defined.Key words: CRA Deep Water High Pressure Wells Matrix acidizing 17Cr stainless steel duplex stainless steel UNS S39274. 
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