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Article
Preparation an Optimal Hydrogel of Water Shutoff for Iranian Oil Field

Authors: Hassan Naderi --- Mahsa Baghban Salehi --- Mohsen Vafaie Sefti --- Asefe Mousavi Moghadam
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2014 Volume: 377 Issue: 10th Pages: 169-181
Publisher: Ministry of Oil وزارة النفط

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Abstract

Presenting a suitable hydrogel for water shutoff in Iranian oil field is based on gelation time and gel strength. Rheological behavior of gel was the main purpose of this research. To determine the gelation time, thermal stability and gel strength a plan of bottle tests were conducted by using the central composite design method with two factors. The hydrogels composed of AN125VLM and chromium triacetate as copolymer and crosslinker, respectively were recorded for 8 weeks. Furthermore, the consistency modulus of the gels was measured by amplitude sweep tests using the Paar-Physica universal spectrometer, model MCR501. A hydrogel with 26,339 ppm concentration of copolymer and 0.12 ratio of crosslinker/copolymer and also gelation time of 2 days was selected as the optimal one. Also, it showed the maximum value of consistency modulus of 31,900 Pa among the other samples, tremendously, which showed the highest resistance against external stress. To ensure the gel strength among different effective parameters on the gel in porous media, a plan of rheological experiments were carried out. A 12 Run Plackett-Burman design was used for screening the eight parameters of NaCl, CaCl2, KCl and MgCl2 concentrations, temperature, pH, sodium lactate and nanoclay while keeping the optimal hydrogel component constant. Finally, it was found that temperature was the most effective parameter to control gelation time and also pH had negligible effect on the gelation time of this optimal gel.


Article
The Effect of Plastomers Polymer Type and Concentration on Asphalt and Moisture Damage of SMA Mixtures
تأثير نوع وتركيز اللدائن البلاستوميرية على الإسفلت وتأثيرات الماء للخلطات الإسفلتية نوع SMA

Authors: Tan Yi-qiu2 وتان اي جيو2 --- Al-Hadidy AI1 عبد الرحيم إبراهيم الحديدي
Journal: AL Rafdain Engineering Journal مجلة هندسة الرافدين ISSN: 18130526 Year: 2011 Volume: 19 Issue: 5 Pages: 1-11
Publisher: Mosul University جامعة الموصل

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Abstract

ABSTRACTIn this investigation, two plastomers polymer types namely: polyethylene (PE) and polypropylene (PP) were used to modify asphalt cement. Nine different blends including conventional mixture were subjected to binder testing such as rheological tests before and after aging, as well as to some other tests related to the uniformity of the system. Marshall stability, Marshall Quotient, static tensile strength, tensile strength ratio, static compressive strength and index of retained strength were carried out on the stone mastic asphalt (SMA) mixtures. Research results indicate that the addition of these polymers enhance the unaged and aged rheological properties of base binder. The results also indicated that the modified binders are complying with the ASTM D491 specifications for asphalt used in waterproofing applications. As well as, the SMA mixtures containing such binders can satisfy the performance requirement of high-temperature and much rain zone.

الخلاصةفي هذه الدراسة, تم استخدام نوعين من اللدائن البلاستوميرية وهما البولي أثلين و البولي بروبلين لتطوير الإسفلت. تم مزج تسعة نسب من هذه اللدائن بضمنها الإسفلت غير المطور في تحضير النماذج الإسفلتية الجديدة.أجريت بعد ذلك الفحوصات الريولوجية قبل وبعد إجراء فحص التقادم إضافة إلى إجراء فحص التجانس. كما أجريت فحوصات المارشال, صلادة المارشال, مقاومة الشد غير المباشر, نسبة الفقدان في مقاومة الشد, مقاومة الانضغاط ودليل الرجوع في مقاومة الانضغاط على الخلطات الاسقلتية المطورة. أوضحت النتائج بأن إضافة مثل هذه اللدائن يحسن من الخصائص الريولوجية للإسفلت المطور قبل وبعد إجراء فحص التقادم. كما عكست النتائج بأن النماذج الاسقلتية المطورة تطابق المواصفة الأمريكية D-491 والخاصة بالإسفلت المستخدم لأغراض قطع النضوح وأعمال التسطيح, إضافة إلى ذلك أبدت الخلطات الإسفلتية المطورة بهذه اللدائن مقاومتها لتأثيرات الحرارة العالية والرطوبة.

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