IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 181-187   

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S. S. Tabatabaee Moradi, N. I. Nikolaev and E. L. Leusheva
( Received: August 31, 2017 – Accepted in Revised Form: November 30, 2017 )

Abstract    Cementing of the casing pipes inside the wellbore is considered as one of the most expensive and difficult operations during the well construction process. A low quality cementing job leads to further repair operations, which are usually costly and time-consuming to conduct. Polymer cements are being used for decades in the oil and gas industry due to their improved properties such as sedimentation stability, flexural strength and adhesion. Furthermore, these cements are characterized by improved pore structure, decreased slurry density, decreased porosity and controllable rheological parameters. In this research, a single domestic polymer is added as a cement modifying agent. Domestic additive are easier to buy in the market and are usually cheaper than the imported additives. In addition, using a single additive leads to a simplified logistics operation. Results of the experimental investigations on the main properties of the developed cement systems show that using the proposed polymer in the proper concentration leads to an optimum flow-ability and pump-ability of the slurry, reduced cement water loss, increased strength characteristics and improved adhesion properties of the set cement.


Keywords    Well construction, Cement, Polymer additive, Multi-functional additive.


چکیده    سیمان کاری لوله های جداری داخل چاه، به عنوان یکی از گران ترین و سخت ترین عملیات ها در طول فرآیند ساخت چاه به شمار می رود. یک سیمان کاری با کیفیت پایین منجر به عملیات های تعمیری می شود که معمولا گران و زمان بر هستند. سیمان های پلیمری به دلیل خواص بهبود یافته نظیر پایداری رسوبی، مقاومت خمشی و چسبندگی برای دهه ها در صنعت نفت و گاز مورد استفاده قرار می گیرند. علاوه بر این، این سیمان ها با خصوصیاتی نظیر فضای متخلل بهبود یافته، دوغاب سیمان با چگالی کمتر، تخلل کمتر و ویژگی های رئولوژیکی قایل کنترل، متمایز می شوند. در این پژوهش از یک پلیمر داخلی به عنوان عامل بهبود دهنده خواص سیمان استفاده شده است. افزودنی های داخلی معمولا راحت تر برای خریدن در بازار و ارزان تر از افزودنی های وارداتی می باشند. علاوه بر این، استفاده از تنها یک افزودنی به یک عملیات لجستیکی ساده تر منجر می گردد. نتایج بررسی های آزمایشگاهی بر روی خواص اصلی سیمان های توسعه یافته نشان می دهد که استفاده از پلیمر پیشنهادی در غلظت مناسب باعث قابلیت جریان پذیری و پمپ پذیری بهینه دوغاب، آب آزاد کاهش یافته سیمان، خواص مقاومتی افزایش یافته و چسبندگی بهتر سنگ سیمان می شود.


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