بررسی تأثیر ترکیب سیمان چاه نفت بر یکپارچگی غلاف سیمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی نفت و گاز، دانشگاه صنعتی سهند

2 دانشگاه صنعتی سهند تبریز

10.22124/jcr.2024.26195.1635

چکیده

حفظ یکپارچگی چاه‌ که تا حد زیادی به ویژگی‌های سیمان وابسته است، می‌تواند سبب جلوگیری از خسارات جبران‌ناپذیر محیط زیست شود. سیمان به منظور حفظ یکپارچگی باید دارای تخلخل و تراوایی کم، مقاومت کافی پیوند در سطوح تماس و ویژگی‌های مکانیک سنگی مناسب به منظور مقاومت در برابر تنش‌ها باشد. در این پژوهش، ترکیبات سیمان شامل سیمان پورتلند، سیلیکافلور و اکسیدمنیزم ساخته و به منظور ارزیابی توانایی ترکیبات در ایجاد یکپارچگی، آزمایشات بر روی مواد اولیه، دوغاب و سنگ سیمان انجام شدند. این آزمایشات شامل اندازه‌گیری‌های چگالی، سیال آزاد، تخلخل، تراوایی، مقاومت پیوند، مقاومت فشاری و مدول یانگ بود. نتایج نشان داد که با افزودن سیلیکافلور مقدار تخلخل و تراوایی سنگ سیمان به 9.76 درصد و 0.037 میلی دارسی کاهش و با افزودن اکسیدمنیزیم، مقدار مقاومت پیوند و مدول یانگ به 503.4 و 418.32 مگاپاسگال افزایش می‌یابد. همچنین نتایج نشان داد که افزودن این مواد باعث کاهش مقاومت فشاری می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the effect of oil well cement composition on the cement sheath integrity

نویسندگان [English]

  • Mohammad Barkhordar 1
  • Seyyed Shahab Tabatabaee Moradi 2
1 Faculty of Petroleum and Natural Gas Engineering
2 Faculty of Petroleum and Natural Gas Engineering
چکیده [English]

Oil and gas wells are usually cased and cemented to provide a long-term integrity during the life of the well. Maintaining the integrity of the oil and gas wells, which is largely dependent on the characteristics of the cement, can prevent irreparable damage to the environment. To maintain well integrity, cement sheath must have low porosity, low permeability, sufficient bond strength at the contact surfaces, and suitable rock mechanical properties to withstand the induced stresses. In this research, cement compositions based on Portland cement, silica flour and magnesium oxide were developed and experimentally tested to evaluate their ability of well integrity provision. Tests were performed on raw materials, cement slurry and set cement samples. These tests included measurements of density, slurry free fluid, set cement porosity, permeability, bond strength, compressive strength, and Young's modulus. The results showed that with the addition of silica fluor, the porosity and permeability of set cement decreased to 9.76% and 0.037 mD, and with the addition of magnesium oxide, the bond strength and Young's modulus increased to 503.4 and 418.32 MPa. Also, the results showed that the addition of these materials leads to a reduction in the cement compressive strength.

کلیدواژه‌ها [English]

  • Cement
  • Integrity
  • Bond strength
  • Porosity
  • Permeability
  • Compressive strength

مراجع

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