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The effect of pressure change on the internal corrosion rate of oil pipelines

تأثير تغير الضغط في معدل التآكل الداخلي لأنابيب النفط

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 Publication date 2013
and research's language is العربية
 Created by Shamra Editor




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Corrosion is the most important problem in the process of oil production, Its results are: sudden fracture, high economic cost and great loss in oil equipment. Appropriate solutions have been suggested to extend the life of facilities, and to avoid corrosion phenomenon which may get the facility out of service, But, finding the main reasons causing this phenomenon, and studying the factors that contribute to increase or reduce the spread of corrosion requires more urgent attention. In this paper, the data of the pressure has been analyzed in three crude oil pipelines and focus was on the values during the days where changes were irregular. In the same period, the study of internal corrosion rate was being done, using weight loss method. It has been noticed that when the value of pressure is greater than 2 Mpa, the internal corrosion rate will be above the maximum. allowable limit which is 4 mil per year (MPY), while the internal corrosion rate will be within the acceptable range when the pressure is not greater than 1 Mpa.


Artificial intelligence review:
Research summary
تناول البحث تأثير تغيّر الضغط على معدل التآكل الداخلي لأنابيب النفط، وهي مشكلة شائعة في صناعة النفط تؤدي إلى خسائر اقتصادية كبيرة. تم جمع بيانات ميدانية لثلاثة أنابيب نفطية خلال فترات شهدت تغيرات غير منتظمة في الضغط، وتم قياس معدل التآكل باستخدام طريقة الوزن المفقود. أظهرت النتائج أن ارتفاع الضغط إلى ما فوق 2 ميغاباسكال يرافقه زيادة في معدل التآكل إلى ما فوق الحد الأقصى المسموح به، وهو 4 أجزاء بالألف من الإنش في السنة. بينما يكون معدل التآكل ضمن الحدود المسموح بها عند انخفاض الضغط إلى حدود 1 ميغاباسكال. تم إجراء اختبارات متعددة على العينات المعدنية من الأنابيب، بما في ذلك التحليل الكيميائي واختبارات القساوة والشد، وأظهرت النتائج مطابقة للمواصفات المعتمدة. خلص البحث إلى أن زيادة الضغط تؤدي إلى زيادة الاحتكاك والتلامس بين المعدن والمواد المسببة للتآكل، مما يستدعي زيادة كمية مثبط التآكل الكيميائي عند ارتفاع الضغط للحفاظ على الطبقة الحامية للأنابيب.
Critical review
دراسة نقدية: على الرغم من أن البحث قدم معلومات قيمة حول تأثير الضغط على معدل التآكل الداخلي لأنابيب النفط، إلا أنه يمكن تحسينه من خلال توسيع نطاق الدراسة لتشمل عوامل أخرى مثل تأثير درجات الحرارة المختلفة ونوعية النفط الخام المستخدم. كما أن الاعتماد على طريقة الوزن المفقود فقط قد لا يكون كافياً لتقديم صورة شاملة عن التآكل، لذا يمكن استخدام تقنيات أخرى مثل التصوير الميكروسكوبي الإلكتروني لتحليل السطح المتآكل بشكل أدق. بالإضافة إلى ذلك، قد يكون من المفيد إجراء تجارب ميدانية على نطاق أوسع وفي بيئات مختلفة للتحقق من النتائج وتعميمها على حالات أخرى.
Questions related to the research
  1. ما هو الحد الأقصى المسموح به لمعدل التآكل الداخلي لأنابيب النفط وفقاً للدراسة؟

    الحد الأقصى المسموح به لمعدل التآكل الداخلي هو 4 أجزاء بالألف من الإنش في السنة (MPY).

  2. ما هي الطريقة المستخدمة لقياس معدل التآكل الداخلي في البحث؟

    تم استخدام طريقة الوزن المفقود لقياس معدل التآكل الداخلي.

  3. ما هو تأثير ارتفاع الضغط إلى ما فوق 2 ميغاباسكال على معدل التآكل الداخلي؟

    ارتفاع الضغط إلى ما فوق 2 ميغاباسكال يرافقه زيادة في معدل التآكل الداخلي إلى ما فوق الحد الأقصى المسموح به.

  4. ما هي التوصيات التي قدمها البحث لمواجهة زيادة معدل التآكل الداخلي عند ارتفاع الضغط؟

    أوصى البحث بزيادة كمية مثبط التآكل الكيميائي عند ارتفاع الضغط للحفاظ على الطبقة الحامية للأنابيب.


References used
Maneesh Singh, Tore Markeset, "A methodology for risk-based inspection planning of oil and gas pipes based on fuzzy logic framework", University of Stavanger, Norway, 2008
NESIC. S.; WANG. S.; CAI. J. and XIAO. Y "Integrated CO2 Corrosion – Multiphase Flow Model", 2004 NACE 2004
HIGH. M. S.; WAGNER, J., and NATARAJAN, S "Mechanistic Modeling of Mass Transfer in the Laminar Sublayer in Downhole Systems" , 2000 Corrosion/2000, Paper No. 62, Houston, TX: NACE International
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