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Article
Gypsum Mud Rheological Behavior

Author: Wissam.H.AL-Hashimi,
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2017 Issue: 15 Pages: 28-50
Publisher: Ministry of Oil وزارة النفط

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Abstract

Gypsum muds are considered as the most important ones used in oil well drilling due to their thermal stability in addition to the durability of their ingredients. The main aim of this work is to study the effect of the gypsum mud compositions on their rheological behavior under the conditions of high-pressure and high temperature. Eleven samples of gypsum mud were tested using Fann viscometer model 50-C. All the tested samples had the same trend of reduction in both plastic viscosity and yield point with increasing temperature. The results showed that with 5 ppb of Q Broxine thermal degradation is obtained at approximately 150 0 F; this is due to the over treatment with thinner which result in more soluble solids and higher rheological properties while the decrement in NaOH concentration from 0.7 ppb to 0.35 ppb results in an increase in both yield point and plastic viscosity; this is due to the loss of OH-1 ions. Six rheological models were adopted: Bingham, power law, modified power law, Robertson stiff, modified Robertson stiff and Casson. Both Robertson stiff model and Casson model showed more acceptable values that fit the experimentaldata accurately.


Article
New Alternative Thinner in the Drilling Fluid System A

Author: Wissam H. AL-Hashimi,
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2018 Issue: 18 Pages: E43-E62
Publisher: Ministry of Oil وزارة النفط

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Abstract

The most important constituent of drilling operation success is keeping the drilling fluid rheological properties within a certain limit to maintain continuing their functions in a good manner. To achieve that, the drilling mud system needs continuous and direct supervision such as measuring its rheological properties and treating any deviation in their values. Viscosity is the most important property in hydraulic program success due to its direct relation with bottom hole cleaning during drilling, thus related with the drilling rate, so this property should be kept basically to ensure bottom hole cleaning and high drilling rate at the same time. Some chemicals such as thinner should be added to the mud system to keep both viscosity and other properties within certain standards and required limits; these materials have a high cost, increasing both the metric cost and the final cost of such well. The aim of this research is to test the physical and chemical properties for a local material, as a thinner, which tends to decrease the rheological properties of drilling mud .Thirty nine samples of different types of drilling mud are tested with both the native and foreign imported materials. The results for both additive materials are compared and concluded that the local thinner has the same trend with the imported material to a certain limit.

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Article
Utilizing A Dual Use Local Materials Instead of Imported Foreign Materials for Drilling Mud Conditioning
تحسين مواصفات سائل الحفر بأستخدام مواد محلية (ثنائية العمل) بدلا عن المواد الاجنبية المستوردة

Author: Wissam H. Al-hashimi
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2018 Issue: 20 Pages: 194-212
Publisher: Ministry of Oil وزارة النفط

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Abstract

The most important constituents of drilling operation success is keeping the drilling fluid rheological properties within a certain limit to maintain continuity of their functions in a good manner. To achieve that, the drilling mud system needs continuous and direct supervision such as measuring its rheological properties and treating any deviation in their values. Viscosity is the most important property in hydraulic program success due to its direct relation with a bottom hole cleaning during well drilling, thus related with the drilling rate, so this property should be kept essentially to ensure bottom hole cleaning and high drilling rate at the same time. Some chemicals should be added to the mud system to keep both viscosity and other properties within certain standards and the required limit ,the high cost of such chemicals increase both the metric cost and the final cost of such wells. The aim of this research is to test the physical and chemical properties of a local material, as a thinner and a filtration rate reducer, which tends to decrease the rheological properties of drilling mud. Twenty six samples of different types of drilling mud are tested with both the local and imported foreign materials. The results for both additive materials are compared and it is found that the local thinner has the same trend as the foreign material to a certain extent. Also, in this work, the ideal rheological model is detected among six rheological models by preparing an excel system program to determine the Average Absolute Percentage Error (AAPE). This program compares the calculated shear stress values and the measured values obtained from high pressure high temperature viscometer. The selected models are Bingham plastic model, Power law model, Modified power law model, Robertson stiff model, and Modified Robertson stiff model and Casson model.The results show that the Power law and Casson models coincide with the tested samples.

انَ من أهم مقومات نجاح عملية الحفر هو الحفاظ على الخواص التيارية لسائل الحفرضمن حد معين لدوام نجاحه في اداء وظائفه بشكل جيد ,ولتحقيق ذلك تحتاج منظومة سائل الحفر الى الاشراف المباشر و المستمر و المتمثل بقياس خواصه التيارية ومعالجة اي تغير في مواصفاته اذ تعتبر لزوجة سائل الحفر احد أهم اسباب نجاح البرنامج الهيدروليكي وذلك لارتباطها المباشر بعملية تنظيف قعر البئر اثناء عملية الحفر و بالتالي ارتباطها مع سرعة عملية الحفر و لذلك يجب الحفاظ على لزوجة سائل الحفر بالدرجة الاساس لغرض ديمومة نظافه قعر البئر وزيادة سرعة الحفر في آن واحد . هناك مواد كيميائية يتم اضافتها الى منظومة سائل الحفر للحفاظ على لزوجة سائل الحفر و الخواص الاخرى ضمن الحدود القياسية المطلوبة , انٌ تلك المواد الكيميائية المضافة تكون ذات كلفة عالية الامر الذي يزيد من كلفة حفر المتر الواحد و زيادة الكلفة النهائية لحفر البئر. انَ الهدف من هذا البحث هو اجراء بعض الفحوصات الكيمياوية والفيزياوية لمادة محلية وطنية تعمل على تقليل كل من اللزوجة والراشح وبالتالي التقليل من الخواص التيارية لسائل الحفر حيث تم اجراء فحوصات مختبرية لــــ26 نموذج من سائل الحفر بأستخدام المادة الوطنية والمادة الاجنبية ومقارنة النتائج حيث اثبتت تلك الفحوصات ولحد ما نجاح المادة الوطنية في تحقيق المطلوب اسوة بالمادة الاجنبية المضافة لتحقيق نفس الغرض.كما تم في هذا البحث تحديد النمط الامثل من بين ستة انظمة تم اختبارها من خلال اعداد برنامج بنظام الاكسل يقوم بحساب معدل الخطأ النسبي المطلق (Average Absolute Percentage Error) والمعروف بالــــ(AAPE) حيث يقوم هذا البرنامج بمقارنة نتائج اجهاد القص المحسوب بأستخدام تلك الانظمة مع النتائج العملية المقروءة من جهاز قياس اللزوجة بظروف الحرارة والضغط العاليين اما الأنظمة المختارة فهي:-1-نظام بنكهام بلاستك (Bingham plastic model) 2- نظام القانون الأسي (Power law model) 3-نظام القانون الأسي المٌطور (Modified power law model) 4-نظام روبرتسون ستف(Robertson stiff model) 5-نظام روبرتسون ستف المٌطور (Modified Robertson stiff model) 6-نظام كاسون (Casson model)ولقد ثبت تطابق كل من انظمة القانون الأسي وكاسون مع النماذج المفحوصة.

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