کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5484164 1522785 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of hydration on fractures and permeabilities in Mancos, Eagleford, Barnette and Marcellus shale cores under compressive stress conditions
ترجمه فارسی عنوان
اثر هیدراتاسیون بر روی شکستگی ها و نفوذپذیری در هسته های منسو، ایگلفورد، برنت و مارسلول تحت شرایط تنش فشاری
کلمات کلیدی
شکستگی هیدرولیکی، هیدراتاسیون شیل، استرس ایزوتروپیک، شکستگی ناشی از هیدرات، نفوذپذیری،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی
Hydration swelling was observed to generate microfractures at ambient conditions in some of earlier studies, thus the core permeability is increased. In this paper, to investigate if hydration swelling could induce fractures in shale cores under compressive stress, four shale cores (Mancos, Barnett, Marcellus and Eagleford) with various clay mineral contents and swelling properties were used. CT scan testing was used to observe fractures, and swelling strain testing was conducted to evaluate the hydration swelling properties. The permeabilities of shale cores before and after hydration were measured. In all of the four shale cores under 3000 psi isotropic confining pressure, hydration caused fractures to close rather than propagate. As a result, the permeabilities decreased significantly, up to two orders of magnitude, compared to intrinsic permeabilities in Mancos, Barnett, and Marcellus shales, and a large damage occurred in the Eagleford shale core. Clay mineral content was the main factor influencing the shale permeability damage due to hydration. When clay contents are higher than a certain percent (e.g., 15% in this paper), significant permeability damage was observed. 8% KCl solution could help recover more permeability damage than 4% KCl solution. As a result, during hydraulic fracturing, the salinity should be increased to mitigate the permeability damage caused by hydration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Petroleum Science and Engineering - Volume 156, July 2017, Pages 917-926
نویسندگان
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