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08107 Sulfide Fracture Toughness of Low-alloy Steel OCTG in Mild Conditions at Room Temperature and at 40 F

Picture for 08107 Sulfide Fracture Toughness of Low-alloy Steel OCTG in Mild Conditions at Room Temperature and
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Product Number: 51300-08107-SG
ISBN: 08107 2008 CP
Author: David L. Sponseller, Thomas E. Sponseller, and Bruce E. Urband
Publication Date: 2008
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This study was initiated under API sponsorship to explore the use of very high strength OCTG in formations having lower H2S concentrations and/or higher pH and colder temperatures. Samples from four commercial pipes, each supplied by a different producer and spanning a wide range of hardness values and yield strengths, were examined by the double-cantilever-beam (DCB) test for their resistance to sulfide stress cracking in mild environments at room and low temperatures. Testing parameters were developed to accommodate the very wide range of cracking tendencies resulting from the markedly different mechanical properties and chemical conditions, ranging from standard to 1% H2S / 4.5 pH, at both room temperature and 40° F. At the mildest condition average values of sulfide fracture toughness as high as 70.1 and 64.1 ksi-vin. (77.0 and 70.4 MPa-vm) were achieved at room temperature and 40° F, respectively. Extrapolations to high strength levels suggest the possibility of using C-125 tubulars in the mildest conditions.
This study was initiated under API sponsorship to explore the use of very high strength OCTG in formations having lower H2S concentrations and/or higher pH and colder temperatures. Samples from four commercial pipes, each supplied by a different producer and spanning a wide range of hardness values and yield strengths, were examined by the double-cantilever-beam (DCB) test for their resistance to sulfide stress cracking in mild environments at room and low temperatures. Testing parameters were developed to accommodate the very wide range of cracking tendencies resulting from the markedly different mechanical properties and chemical conditions, ranging from standard to 1% H2S / 4.5 pH, at both room temperature and 40° F. At the mildest condition average values of sulfide fracture toughness as high as 70.1 and 64.1 ksi-vin. (77.0 and 70.4 MPa-vm) were achieved at room temperature and 40° F, respectively. Extrapolations to high strength levels suggest the possibility of using C-125 tubulars in the mildest conditions.
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