کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8124547 1522772 2018 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of gas migration in Sustained-Casing-Pressure annulus by employing improved numerical model
ترجمه فارسی عنوان
تجزیه و تحلیل مهاجرت گاز در حلقه پایدار-کوره فشار با استفاده از مدل عددی بهبود یافته
کلمات کلیدی
سرعت لغزش، فشار پایدار پوشش، مهاجرت گاز مایعات غیر نیوتنی، حباب سرسبز،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی
Currently, the analysis of Sustained-Casing-Pressure (SCP) tests is limited because some researchers' simulations did not take the effect of gas migration in mud into account and their models were based on Newtonian fluids. This is not consistent with the actual field situations that gas migrates in non-Newtonian fluids. In addition, the yield stress effect was also not taken into account. To ensure the operators a realistic and accurate diagnostic testing for the SCP problem, the improvements of mathematical models in SCP problem are of great significance. In this study, by considering the correlation between gas velocity and drag coefficient, a new formula of gas migration velocity in stagnant non-Newtonian fluids was established. Moreover, the yield stress effect was incorporated in the new model. The validations of field data demonstrate that the new model has the credence to the field work. Furthermore, in this study, the effect of gas migration on SCP problem was paid attention seriously based on new model. To demonstrate the importance of gas migration effect, the analysis of variance (ANOVA) were employed to find out the values of mud properties (flow behavior index, yield stress, length of mud, consistency index) that can most significantly influence the wellhead pressure. Then these most influential parameters were utilized in both the new model (with gas migration effect) and the previous model (without gas migration effect) to conduct the comparison. The comparison result indicate that the value of mud compressibility and the value of cement permeability got by the new model are higher than those by the previous model, and the value of initial gas chamber size got by the new model is lower than that by the previous model. These stress explicitly the necessity and significance of considering gas migration effect and considering the non-Newtonian effect on SCP problem, which should not be neglected. The developed models in this research offer significant insights into the SCP problem, which turns out to be powerful in the application of analyzing the SCP problem. This work can lay the theoretical basis to assist operators in diagnostic testing of wells with SCP problem accurately.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Petroleum Science and Engineering - Volume 169, October 2018, Pages 58-68
نویسندگان
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