بررسی آزمایشگاهی تقابل مکانیسم‌های انحلال و تشکیل رسوب حاصل از ناسازگاری در فرآیند تزریق آب کم شور در مخازن نفتی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه پژوهشی مطالعات آزمایشگاهی ازدیادبرداشت، پژوهشکده مهندسی نفت، پژوهشگاه صنعت نفت، تهران، ایران

چکیده

فرآیند تزریق آب خصوصا آب‌های با شوری پایین یکی از فرآیندهای قابل توجه در ازدیادبرداشت میباشد. به طور عمده مکانیسم‌های متفاوتی بر اساس نوع سنگ و سیال در فرآیند تزریق آب در مخزن اتفاق می‌افتد. در این تحقیق با انتخاب آب دریا و همچنین رقیق سازی این آب در فرآیند تزریق به نمونه مغزه‌های سنگ مخزن کلسیتی دو سازوکار انحلال کلسیت و رسوب‌گذاری حاصل از ناسازگاری مورد توجه و بررسی قرار گرفت. با استفاده از تغییرات غلظت یونی، هریک از مکانیسم‌ها، مورد ارزیابی قرار گرفت و با اندازه‌گیری تراوایی نمونه‌ها برآیند تقابل آنها مشخص گردید. در نتایج فعال بودن سازوکار انحلال در فرآیند تزریق آب‌ها با شوری پایین و تزریق آب دریا نیز مشاهده گردید. رسوب‌گذاری نیز به عنوان سازوکارجانبی مشاهده گردید که میتواند بر روی انحلال اثر داشته و میزان آنها را در تراوایی نشان بدهد. جهت تقابل بیشتر مکانیسم‌ها و شبیه‌سازی بهتر در مخزن، تزریق همزمان آب تزریقی و آب سازندی انجام شد. در این فرآیند رسوب‌گذاری تا جایی پیش رفت تا در مواردی اثر انحلال نامحسوس و یا گاها با کاهش نفوذپذیری همراه گردد. این درحالیست که نتایج اندازه‌گیری غلظت یونی، جای‌گذاری یونی منیزیم و یا رقابت منیزیم در رسوب‌گذاری را نشان نداد. لذا برآیند تقابل دو سازوکاررسوب‌گذاری و انحلال در مقدار تغییرات تراوایی، تابعی از نوع سنگ و ترکیب سیال و همچنین شرایط دمایی تزریق می‌باشند که در نتایج به وضوح نشان داده شدند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Investigation of Dissolution and Precipitation by Injected Water Incompatibility in Low Salinity Water Injection in Oil Fields

نویسندگان [English]

  • Saeed Abbasi
  • Behjat Karipayhan
  • Mohammad Heshmati
EOR Study Center, Petroleum Engineering Research Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran
چکیده [English]

The water injection process, especially low salinity water injection (LSW), is one of the significant processes in enhanced oil recovery. Mainly, different mechanisms are based on the type of rock and fluid in the water injection process in the reservoir. In this research, seawater and diluted water are injected into calcite reservoir rock in reservoir condition. Dissolution and precipitation mechanism by water incompatibility have considered and investigated. The competition between dissolution and precipitation mechanisms, have evaluated by concentration change in outlet of injected core, and permeability change. The results have shown that the dissolution mechanism is dominant in low salinity and seawater injection. In addition, precipitation have observed as an effect on permeability reduction. The competition between mechanisms and contact time effect is investigated by water co-injection into core sample. The results have shown that scale deposition can cause low effect on permeability reduction because dissolution. Also concentration change did not show ion exchange for magnesium ion in precipitation. Thus, the contrast between the precipitation of water incompatibility and dissolution mechanisms in the permeability changes are a function of the rock structure and injection fluid composition, as well as the temperature conditions, as are shown in the results.

کلیدواژه‌ها [English]

  • Water Injection
  • Dissolution
  • Precipitation
  • Incompatibility
  • Low Salinity Water
  • Ion Exchange
  • Formation Damage
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