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A Comparison of the Pitting and Crevice Corrosion of Directional Drilling Alloys With Oilfield Production Alloys

Picture for A Comparison of the Pitting and Crevice Corrosion of Directional Drilling Alloys With Oilfield Production Alloys
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The pitting corrosion and crevice corrosion of oilfield production alloys (e.g., 13Cr/UNS S41000, 17-4PH/UNS S17400, 25Cr/UNS S32750, A286/UNS S66286, 718/UNS N07718) and proprietary austenitic stainless steels for directional drilling (PREN between ~20 to ~45) has been investigated. Specifically, series of electrochemical tests have been conducted to rank the alloys, establish simple correlations between electrochemical parameters, PRENmod, and 3-to-60-day immersion tests in 3.5% NaCl at ambient temperature. For all but one alloy, pitting was absent in stark contrast to crevices. Upon tracking populations and dimensional characteristics of crevices over time, trendlines comparing the susceptibility of the alloys towards crevice corrosion were established. Practical conclusions were reached, including the following: (1) 13Cr consistently developed crevices within days, (2) 17-4PH as well as all traditional directional drilling stainless steels developed crevices within one to five weeks, and, (3) neither 718, 25Cr, nor newer directional drilling alloys with both high nickel and high PRENmod showed any sign of crevices upon being tested up to 60 days. Through a variety of comparisons, this investigation also reveals useful technical directions for the development of new, economical, and fit-for-service Oil & Gas alloys for both production and drilling. 

Product Number: 51320-14432-SG
Author: Manuel Marya
Publication Date: 2020
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04139 Corrosion Behavior of Carbon Steel, Low Alloy Steel and CRA's in Partially Deaerated Sea Water and Commingled Produced Water

Product Number: 51300-04139-SG
ISBN: 04139 2004 CP
Author: Michael John Schofield / K.C. Waterton / Tim Evans
Publication Date: 2004
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A test programme was conducted to study corrosion behaviour of - 1. carbon and low alloy steels, 2. austenitic, martensitic and duplex stainless steels and 3. nickel-based Alloy 718 - in low oxygen content (20 & 200 ppb) seawater.

 

 
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00417 CREVICE CORROSION STUDIES USING ELECTROCHEMCIAL POTENTIAL NOISE MEASUREMENTS

Product Number: 51300-00417-SG
ISBN: 00417 2000 CP
Author: J.A. Wharton, B.G. Mellor and R.J.K. Wood, C.J.E. Smith
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Picture for 03126 PHYSICAL METALLURGY OF ALLOYS 718,
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03126 PHYSICAL METALLURGY OF ALLOYS 718, 725, 725HS, 925 FOR SERVICE IN AGGRESSIVE CORROSIVE ENVIRONMENTS

Product Number: 51300-03126-SG
ISBN: 03126 2003 CP
Author: Sarwan Mannan, Ed Hibner, and Brett Puckett
Publication Date: 2003
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Nickel-base alloys 718, 725, and 925 are commonly used in oil and natural gas production.  Being heavily alloyed multi-component systems; these materials require special consideration for processing and heat treatments.  This paper shows the effect of intergranular precipitates on mechanical properties and  slow strain rate (SSR) test results in sour oil patch environments.

 
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