مکانیابی بهینه هندسی آشکارسازها در اطراف لوله های قطور هیدروکربنی برای تشخیص الگوی انباشت و اندازه گیری ضخامت رسوب با استفاده از روش گامای عبوری

نوع مقاله : مقاله مکانیک

نویسندگان

1 کارشناس ارشد، دانشکده مهندسی مکانیک، دانشگاه شیراز

2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه شیراز

3 استادیار، پژوهشکده کاربرد پرتوها، پژوهشگاه علوم و فنون هسته ای

چکیده

تضمین جریان همزمان با نیاز روزافزون به برداشت نفت و گاز از مخازن، یکی از چالش های بزرگ است و در این بین انباشت رسوب درون خطوط لوله به عنوان مشکلی بزرگ وجود دارد. از آنجایی که تجمع این رسوبات در مدت زمانی کوتاه صورت می گیرد نیاز به کنترل و پیش بینی آن درون خطوط لوله در کمترین زمان ممکن از اهمیت ویژه ای برخوردار است. برای پیش بینی الگوی انباشت رسوب و اندازه گیری ضخامت آن از روش های مختلفی استفاده می شود که روش گامای عبوری یک روش غیرمخرب برای این کار است. رویکرد لازم در بکارگیری این روش، چینش بهینه آشکارساز و چشمه حول لوله است به گونه ای که در مدت زمانی کوتاه با بیشینه دقت ممکن بتوان فرایند اندازه گیری را انجام داد. ملاحظات هزینه ای، قابلیت بکارگیری سنجشگر در موقعیت های مختلف روی سکو و زیر دریا، و کاهش دز جذبی اپراتور به زیر آستانه از دیگر پارامترهای مهم است که به واسطه چینش بهینه چشمه آشکارساز پیرامون لوله قابل دستیابی است. در این مطالعه با استفاده از ابزار تحلیل هندسی و شبیه سازی مونت کارلو نشان داده شد که بادبزنی از آشکارسازها با فاصله مشخص حول لوله می تواند منجر به اندازه گیری مطلوب رژیم انباشت و ضخامت رسوب گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Optimum geometric position of detectors around thick hydrocarbon pipes for deposition pattern detection and scale thickness measurement

نویسندگان [English]

  • Rasmieh Zeinavi Mianabi 1
  • Ataollah Rabiee 2
  • Mohsen Sharifzadeh 3
1 Department of Nuclear Engineering, School of Mechanical Engineering, Shiraz University, Shiraz, Iran.
2 Department of Nuclear Engineering, School of Mechanical Engineering, Shiraz University, Shiraz, Iran.
3 Radiation Applications Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
چکیده [English]

Ensuring flow with the increasing need to extract oil and gas from reservoirs is known as a big challenge, and in the meantime, scale deposition in pipelines is a major problem. Since scale deposition occurs in a short time, it is especially important to control and predict it in pipelines as soon as possible. There are several methods for predicting the deposition pattern and measuring its thickness. The gamma transmission method is a non-destructive method for this task. The application of this technique requires optimal placement of the detectors and radioactive source around the pipe so that the measurement can be made with maximum accuracy in a short time. The cost, the ability to deploy the instrument at various positions on the platform and underwater, and minimization of absorbed dose to the operator are other important goals that should be considered. In this study, using the geometric analysis and Monte Carlo simulation, it is shown that the fan-shaped arrangement of the detectors with certain spacing around the pipe can lead to an optimal measurement of the deposition regime and the scale thickness.

کلیدواژه‌ها [English]

  • scale deposition pattern
  • transmission gamma technique
  • scale thickness measurement
  • fan-shaped arrangement
  • stepped arrangement
  • propagation error
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