IJE TRANSACTIONS B: Applications Vol. 32, No. 2 (February 2019) 338-345    Article in Press

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M. Izadi, M. Tabatabaee Ghomi and G. Pircheraghi
( Received: October 06, 2018 – Accepted in Revised Form: January 03, 2019 )

Abstract    In directional drilling, the most important thing that leads to pulling out the drill string is end of mud motor working life. Considering the working conditions of down hole mud motors; increasing the mechanical properties of their stator’s elastomer is crucial. Some attempts were done to increase the motor performance through geometrical changes but lack of material improvement is significant in previous studies. In this study, NBR/nanoclay composite samples were prepared through melt intercalation in an internal mixer and tested with regard to the temperature and drilling mud of down hole. Hardness, tear, fatigue and tensile test results of neat NBR elastomer and nanocomposite of NBR and different loading of nanoclay showed that the mechanical strength of new composites are considerably increased. With the help of strain energy method it was revealed that the life of NBR/nanoclay composite compared to neat NBR was enhanced. Therefore, increasing the working life and performance of the motor is achievable by using this nanocomposite. In the drilling industry, there is a direct relation between time and cost; therefore, increasing the working life of the motor leads to a considerable cost reduction in this expensive industry.


Keywords    Down hole mud motors, Nitrile rubber, Nanoclay, Fracture Toughness, Strain Energy



در حفاری جهتدار چاه‌های نفت، مهمترین عاملی که منجر به بیرون کشیدن رشته حفاری می¬شود اتمام زمان‌کاری موتورهای درون چاهی است. با در نظر گرفتن شرایط کاری موتورهای درون چاهی تقویت استحکام مکانیکی الاستومر این موتورها ضروری به نظر می¬رسد. تحقیقاتی برای بهبود عملکرد موتور از طریق تغییر در هندسه و طراحی انجام شده است، اما فقدان تقویت ماده در مطالعات قبلی چشمگیر است. در این تحقیق کامپوزیت “NBR/Nanoclay” از طریق ترکیب ذوبی در مخلوط‌کننده داخلی آماده شده است و با در نظر گرفتن دما و تاثیر سیال حفاری درون چاهی تست گردیده¬اند. تست¬های سختی، پاره-گی، خستگی، استحکام کششی بر روی الاستومر با NBR خالص و نانوکامپوزیت NBR که حاوی میزان مختلف نانورس بوده است نشان از افزایش قابل توجه استحکام مکانیکی کامپوزیت جدید دارد. همچنین با کمک روش انرژی کرنشی افزایش عمر کامپوزیت “NBR/Nanoclay” در مقایسه با NBR خالص نشان داده شده است. در صنعت حفاری، رابطه¬ی مستقیمی بین زمان و هزینه وجود دارد و لذا افزایش عمر کاری موتور منجر به کاهش هزینه قابل توجهی در این صنعت گران خواهد شد.


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