انتخاب وزن سیال حفاری بر مبنای معیارهای مکانیک سنگ: مطالعه موردی در یکی از میادین جنوب غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی سهند، تبریز، ایران

چکیده

از مهم‌ترین وظایف سیال حفاری، حفظ و فراهم‌کردن پایداری دیواره چاه می‌باشد. فشار کم در داخل چاه می‌تواند منجر به ریزش دیواره و یا ورود ناخواسته سیال به درون چاه گردد. از طرفی فشار بالای داخل چاه می‌تواند منجر به شکست دیواره چاه گردد؛ بنابراین مقدار مناسب چگالی سیال حفاری باید به‌گونه‌ای انتخاب شود که فشار داخل چاه در حد تعادل باقی بماند. هدف این پژوهش تعیین مقدار چگالی سیال حفاری با توجه به مفهوم پایداری دیواره چاه است به‌گونه‌ای که تنش‌های شعاعی و مماسی در دیواره چاه برابر گردند. بدین منظور ابتدا داده‌های موردنیاز از یکی از چاه‌های میدانی در جنوب غربی ایران جمع‌آوری شدند. سپس با استفاده از روابط موجود تنش‌های القائی در دیواره چاه محاسبه گردیدند. نتایج این مطالعه نشان داد که با توجه به پنجره ایمن چگالی سیال حفاری، مقدار بیشترین و کمترین چگالی بهینه سیال که در آن پایداری دیواره چاه در عمق‌های مورد نظر حفظ خواهد شد به ترتیب 16/80 و 13/93 پوند بر گالن خواهد بود. همچنین مقایسه چگالی بهینه و چگالی واقعی مورد استفاده در سیال حفاری این چاه نشان داد که به دلیل پایین‌تر بودن چگالی واقعی استفاده شده در عملیات نسبت به چگالی بهینه، در اعماق مختلف مشکلات عدم پایداری دیواره چاه مشاهده شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Selection of drilling fluid weight based on rock mechanics criteria: a case study in one of the south-west Iranian field

نویسندگان [English]

  • Reza Jalakani
  • Seyyed Shahab Tabatabaee Moradi
Sahand University of Technology, Tabriz, Iran
چکیده [English]

One of the most important tasks of the drilling fluid is to maintain and provide the stability of the well. Low pressure inside the well can lead to the collapse of the wall or the unwanted entry of fluid into the well. On the other hand, the high pressure inside the well can lead to the failure of the well wall; Therefore, the appropriate value of drilling fluid density should be selected so that the pressure inside the well remains at equilibrium. The Objectives of this research is to determine the density of drilling fluid according to the concept of wellbore stability so that the radial and tangential stresses in the well wall are equal. For this purpose, first the required data were collected from one of the field wells in the southwest of Iran. Then, the induced stresses in the well wall were calculated using the existing relations. The results of this study showed that according to the safe window of drilling fluid density, the maximum and minimum optimal fluid density in which the stability of the well will be maintained at the desired depths will be 16.80 and 13.93 pounds per gallon, respectively. Also, the comparison of the optimal density and the actual density used in the drilling fluid of this well showed that due to the fact that the actual density used in the operation was lower than the optimal density, problems of instability of the well wall were observed at different depths.

کلیدواژه‌ها [English]

  • Drilling fluid density
  • Well stability
  • Fluid density window
  • Elastic coefficients
  • Induced stresses

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نشریه علمی ژئومکانیک نفت
دوره 7، شماره 1
فروردین 1403
صفحه 1-11

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