AMPP Store - Products tagged with 'octg'

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51318-10919-The Study on Residual Stresses in OCTG and Its Effect on Pipe Sour Cracking (SSC) Performances

Product Number: 51318-10919-SG

Author: Xin Long / Pete W. Moore

Publication Date: 2018

$20.00

X-Ray diffraction shows that - with hot or cold straightening - there is still a significant amount residual stresses existing in OCTG pipe bodies. A formula was proposed to include the effect of residual stress on determining the sour cracking resistance.

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A Review Of Fit-For-Purpose Sour Tests Of Low Alloy Steels: Effects Of Buffer Chemistry And Purge Gas Composition

Product Number: 51321-16578-SG

Author: Brian Chambers / Manuel Gonzalez

Publication Date: 2021

$20.00

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Effect Of Nb Addition And Processing Path On The KISSC Of A Low Alloyed OCTG Steel

Product Number: 51321-16696-SG

Author: Marc-Antoine Thual; Koen Bracke; Nuria Sanchez; Steven G. Jansto

Publication Date: 2021

$20.00

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Environmentally-Assisted Cracking (SSC And SCC) Of Martensitic Stainless Steel OCTG Material In Sour Environment In 5%Nacl And 20%Nacl Solution

Product Number: 51322-17563-SG

Author: Yuichi Kamo, Yusuke Mizuno, Yasuhide Ishiguro

Publication Date: 2022

$20.00

Martensitic stainless steels for OCTG materials are widely used in sweet and mild sour conditions. Environmentally-assisted cracking (EAC) is a major corrosion-related issue when using stainless steels as OCTG materials. The EAC in specific oil/gas well conditions with sour environments is defined as sulfide stress cracking (SSC) and stress corrosion cracking (SCC). The SSC is a type of cracking caused by hydrogen embrittlement, which is attributed to a cathodic reaction under acidic conditions, while SCC is associated with an anodic reaction. SSC testing for martensitic stainless steels for OCTG material is often carried out at or near ambient temperature under conditions simulating condensed water, and SCC tests are conducted at higher temperatures under conditions simulating formation water and/or the brine availability test.

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Fitness-for-Purpose Research of OCTG for Underground Gas Storage Applications in H2/CO2 Environments

Product Number: 51320-14698-SG

Author: Yameng Qi, Zhonghua Zhang

Publication Date: 2020

$20.00

In China, some underground gas storages (UGS) would be built to reserve the gaseous coal gas (CO, H2, CO2, H2O, etc.). Gaseous hydrogen induced hydrogen embrittlement (HE) and CO2 corrosion could possess great threat to the safety of OCTG in UGS. Fitness-for-purpose research of OCTG materials is urgently expected to screen out the suitable material for tubing application in UGS.
HE resistance and CO2 corrosion of OCTG materials (C110, 3Cr-90S, 13Cr-110 and 13Cr-110S) were investigated by slow strain rate testing and weight loss tests in UGS environments containing CO2 and H2. SSRT results show that both elongation ratio and reduction in area ratio of C110, 13Cr-110 and 13Cr-110S were more than 80%, except for 3Cr-90S. In addition, 3Cr-90S and 13Cr-110 tested in H2/CO2 environments possessed embrittled regions and secondary cracks, respectively. Weight loss test results show that C110 and 3Cr-90S exhibited high corrosion rates, which were classified as severe corrosion followed by qualitative categorization of corrosion rates for oil production systems in NACE RP0775. For stainless steels (13Cr-110 and 13Cr-110S), the corrosion rates were very low (low corrosion). Combined with the above results, 13Cr-110S could be the suitable OCTG material for UGS containing gaseous coal gas.

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Investigation of Sulfide Stress Crack Propagation Using Sour Pipe Burst in Tubulars with Simulated Defects under Pressure

Product Number: 51324-20420-SG

Author: Brian Chambers; Bostjan Bezensek; Sebastian Cravero; Pedro Olivo; Octavio Albores

Publication Date: 2024

$40.00

Seamless oil country tubular goods (OCTG) with defined chemistry and toughness, e.g. API 5CT C110, are utilized as production casing in sour wells globally. These grades must withstand high pressures and mild sour conditions to maintain the integrity of the well and, as such, should resist both sulfide stress crack (SSC) initiation and potential propagation from defects in service. A laboratory study was conducted to assess the tendency of crack propagation from two defined types of defects, electro-discharge machined (EDM) notches and fatigue cracks, simulating potential as-delivered OCTG tubulars. The tubulars were subjected to a variety of test conditions including two temperatures, 4ºC and 24ºC, internal pressures ranging from 550 to 1,100 bar, and exposure to a modified NACE TM0177 Solution B equilibrated with 7% H2S/N2 gas purge. The applied pressure and depth of defects were used to determined applied stress intensity values, K, for each condition to compare tests with one another and to traditional small-scale evaluations per NACE TM0177 Method D, single edge notched tensile (SENT), and constant K compact tension (CT). The findings indicated that tendency towards SSC propagation was principally dependent on type of defect, temperature, and applied K. Threshold K values for SSC propagation from EDM-type defects were higher than determined from any of the small-scale evaluation methods. Fatigue pre-cracks were demonstrated to be more aggressive in promoting SSC propagation compared to EDM-type defects.

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Non Producing Environments Leading to Downhole CRA Completion Failures

Product Number: 51324-20620-SG

Author: B. J. C. Thomas; M. Al Kindi; A.S. Braiki

Publication Date: 2024

$40.00

Materials selection for any oil and gas equipment, but specifically in wells, tend to focus on the nature and characteristic of the producing environments, or injected fluids if dealing with an injector well. They benefit from greater appreciation on the uncertainty range, in terms of volumes, pressure, temperature and concentration of corrodents since it forms the basis of the business case to drill a new well. There is no robust industry-wide materials selection standards, besides that of the sour limitation of ISO 15156, and Operators are therefore relying on their internal standards, if available, or recommendations from equipment manufacturers or suppliers to select the most appropriate OCTG for that given “worst case” environment. This paper describes several wells completion failures that are attributed to temporary internal or external exposures, at times in wells that were not even cleaned up from the initial completion brine. The events that led to extensive internal corrosion of N08535 tubing and cracking of 13Cr-110 ksi (13-5-2 grades per ISO 13680) are described with the aim to bring higher awareness to the Operators that due diligence of materials selection should not be limited to the primary fluids that are to be transported.

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Ripple Slow Strain Rate Test for SSC and SCC of Super 13Cr Martensitic Stainless Steel and 25Cr Super Duplex Stainless Steel Tubular Materials

Product Number: 51324-20735-SG

Author: Chong Li

Publication Date: 2024

$40.00

Corrosion and environmental cracking tests are important for fitness-for-service (FFS) evaluation during the material selection and qualification process to ensure quality of tubular materials. Super 13Cr martensitic stainless steel and super duplex 25Cr stainless steel are commonly used as tubular materials in oil and gas production wells under corrosive environments containing CO2 and H2S. This study evaluated the sulfide stress cracking (SSC) behavior of super 13Cr martensitic stainless steel and stress corrosion cracking (SCC) behavior of 25Cr super duplex stainless steel by using ripple slow strain rate test (SSRT) or cyclic SSRT. Environmental conditions including temperature, H2S, pH and chloride concentrations were varied to develop a service envelope and/or a material performance quality control criterion. This paper also presents implementation of ripple SSRT testing methodology in author’s company best practices for 25Cr tubular material qualification.

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Sour Service Limit Of 17% Cr Stainless Steels Grades For OCTG

Product Number: 51321-16637-SG

Author: Toshiyuki SUNABA/ Susumu HIRANO/ Thiago MESQUITA/ FranceHerve MARCHEBOIS/ Thierry CASSAGNE

Publication Date: 2021

$20.00

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The Effect Of Mill Scale On OCTG Sour Cracking Resistance

Product Number: 51321-16579-SG

Author: Brian Chambers / Xin Long/ Manuel Gonzalez

Publication Date: 2021

$20.00

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Very High Strength Low Alloy Steels For HPHT Applications

Product Number: 51322-17721-SG

Author: Florian Thebault, Julien Pennequin, John Fortaillier, Carine Landier

Publication Date: 2022

$20.00

More and more High Pressure High Temperature (HPHT) sour wells are operated worldwide. Challenging material selection is required for such severe operating conditions.^1,2 Very high strength materials, presenting yield strength above 896 MPa (130 ksi), are required for sustaining the pressure. Consequently, even a low amount of H₂S in the gas phase may lead to a H₂S partial pressure beyond the limit of 3.5 mbar (0.05 psi) established in NACE MR0175 / ISO 15156 standard.³ Indeed, both high yield strengths and partial pressures of H₂S contribute to a situation where the risk of Sulfide Stress Cracking (SSC) is high. The present paper is focusing on the SSC resistance of 130 ksi minimum yield strength material developed for covering such HPHT applications.

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What Test Environment for the Qualification of OCTG Sour Service Grades? Means and Consequences of pH Control

Product Number: 51321-16283-SG

Author: Florian Theabault; Christelle Gomes; Julien Pennequin; Harve Marchebois

Publication Date: 2021

$20.00

Products tagged with 'octg'

Association for Materials Protection and Performance