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The Effects of Operational Parameters on the Flow Characteristics in Annular Space During Under-Balanced Drilling Operations | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 8، شماره 1 - شماره پیاپی 15، مرداد 2021، صفحه 127-138 اصل مقاله (2.32 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2021.22474.1331 | ||
| نویسندگان | ||
| Saeed Ghobadpouri* 1؛ Ali Falavand Jozaei2 | ||
| 1Mechanical Engineering Department, Faculty of Gas and Petroleum, Yasouj University, Gachsaran, Iran | ||
| 2Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran | ||
| تاریخ دریافت: 08 بهمن 1399، تاریخ بازنگری: 25 اردیبهشت 1400، تاریخ پذیرش: 25 اردیبهشت 1400 | ||
| چکیده | ||
| In this research, gas-liquid-solid three-phase flow in the annulus during under-balanced drilling operations is simulated numerically. One-dimensional form of steady-state governing equations including mass and momentum conservation equations for each phase, gas equation of state, and saturation constraint equation in the Eulerian frame of reference are solved by a proposed algorithm. The computational code is validated by using experimental data from a real well, gas-liquid two-fluid numerical simulation, and also some mechanistic models of WellFlo software. Moreover, the results are compared with the experimental data from a laboratory study. The numerical code succeeds in predicting bottom hole pressure and obtaining the characteristic flow behavior during under-balanced drilling. Due to the importance of controlling flow characteristics during the drilling operations, the effects of change in the injected liquid flow rate, gas injection flow rate, choke pressure on the gas, liquid, and solid volume fractions, as well as gas, liquid, and solid velocity distributions along with the annulus, are investigated. According to the obtained results, the effects of liquid injection flow rate and injected gas flow rate on the flow characteristics are decreased along the annulus in the flow direction, but the effects of choke pressure on the flow characteristics are increased along the annulus in the flow direction. Consequently, to change the flow characteristics in the wellhead area, it is better to change the choke pressure and to affect the flow characteristics in the bottom-hole area, it is preferred to change the gas and liquid injection flow rate. In other words, depending on the required situation of flow characteristic changes, the appropriate operational parameter can be used. | ||
| کلیدواژهها | ||
| Under-Balanced Drilling؛ Operational Parameters؛ Flow Characteristics | ||
| عنوان مقاله [English] | ||
| تاثیر پارامترهای عملکردی بر مشخصات جریان درون فضای حلقوی در حین عملیات حفاری زیرتعادلی | ||
| چکیده [English] | ||
| در این تحقیق جریان سه فازی گاز- مایع- جامد درون فضای حلقوی یک چاه تحت عملیات حفاری زیرتعادلی به صورت عددی شبیهسازی شده است. معادلات حاکم، شامل معادلات بقاء جرم و مومنتوم برای هر یک از فازها، معادله حالت فاز گاز و قید هندسی بصورت یک بعدی و در حالت پایا با استفاده از الگوریتم پیشنهادی حل شدهاند. کد توسعه داده شده، با استفاده از دادههای تجربی یک چاه واقعی، شبیهسازی عددی دوفازی گاز- مایع و تعدادی از مدلهای مکانیسمنگر نرمافزار ولفلو اعتبارسنجی شده است. همچنین، نتایج با دادههای تجربی یک مطالعهی آزمایشگاهی مقایسه شدهاند. کد عددی، در پیشبینی فشار ته چاه و مشخصات جریان در حین حفاری زیرتعادلی موفق بوده است. با توجه به اهمیت کنترل مشخصات جریان در حین عملیات حفاری، اثر تغییر نرخ مایع و گاز تزریقی از سرچاه و تغییر فشار چوک بر کسرهای حجمی فازهای مایع، جامد و گاز و همچنین توزیع سرعت فازهای مایع، جامد و گاز در طول دالیز مورد مطالعه قرار گرفته است. نتایج بدست آمده نشان میدهند که اثرات تغییر نرخ مایع و گاز تزریقی بر مشخصات جریان در طول دالیز در جهت جریان کاهش یافتهاند اما، اثرات فششار چوک بر مشخصات جریان در طول دالیز و در جهت جریان افزایش یافته است. در نتیجه، جهت تغییر مشخصات جریان در ناحیهی سرچاهی بهتر است از تغییر فشار چوک استفاده شود و برای تغییر مشخصات جریان در ناحیهی نزدیک به انتهای چاه، تغییرات نرخ دبی فازهای مایع و گاز ترجیح داده میشوند. | ||
| مراجع | ||
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