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Article
Enhancing the Lifting Capacity of Drilling Fluids in Vertical Oil Wells

Author: Amel habeeb Assi
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2017 Volume: 18 Issue: 3 Pages: 13-29
Publisher: Baghdad University جامعة بغداد

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Abstract

Of the many functions that are performed by the drilling fluid, the most important is to transport cuttings from the bit up the annulus to the surface. Various drilling fluid have been widely used in the oil industry to improve lifting capacity. In this study, three mud type have been used which they are, oil base mud, X-anthan polymer and a mixture of CMC and bentonite ,by using Carrying Capacity Index calculation (CCI) , the Xanthan gave good values of CCI than other studied drilling fluid. By using Sifferman chart and field data from well in south of Iraq and API equation to find cutting concentration in the annulus, The results showed that the used of thick mud increase the lifting capacity and decrease volumetric drill cuttings in the annulus but the using thin mud lead to decrease lifting capacity and increase volumetric drill cuttings in the annulus .The results show that the mud viscosity and flow rate have important role in hole cleaning. Also, the effect of annulus velocity and flow pattern on cutting transport ratio is studied by using field data. The effect of cutting size and OD of drill pipe is also studied. Cutting size is one of the parameters that influence the hole cleaning; large size cutting makes the hole cleaning more difficult. The reducing of annular size of hole by increasing the OD of drill pipe lead to increasing the annular velocity.


Article
Estimation of Lifting Capacity for Selected Wells in Rumaila Field
تخمين قابلية الرفع لابار مختارة في حقل الرميلة

Author: Rafid Kadhim Abbas رافد كاظم عباس
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2017 Volume: 23 Issue: 3 Pages: 107-126
Publisher: Baghdad University جامعة بغداد

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Abstract

This paper deals with studying the effect of hole inclination angle on computing slip velocity and consequently its effect on lifting capacity. The study concentrates on selected vertical wells in Rumaila field, Southern Iraq. Different methods were used to calculate lifting capacity. Lifting capacity is the most important factor for successful drilling and which reflex on preventing hole problems and reduces drilling costs. Many factors affect computing lifting capacity, so hence the effect of hole inclination angle on lifting capacity will be shown in this study. A statistical approach was used to study the lifting capacity values which deal with the effect of hole inclination angle and those values that do not put the effect of hole inclination angle under consideration. Results illustrated that low hole inclination angles had a slight effect on lifting capacity values , but this study could be used on high inclination angles like directional wells or horizontal wells , hence high hole inclinations angle will yields high effect on lifting capacity values.

هذا البحث يتناول دراسة تاثير زاوية انحراف البئر على حساب سرعة الانزلاق و بالتالي على قابلية رفع الصخور. الدراسة تركّزت على ابار عمودية مختارة في حقل الرميلة جنوبي العراق. طرق مختلفة تم استخدامها لحساب قابلية رفع الصخور . قابلية رفع الصخور هي العامل الاكثر أهمية لعملية حفر ناجحة و التي تنعكس على تجنب مشاكل الحفر و تخّفض كلفة الحفر. عوامل كثيرة تؤثر على حساب قابلية رفع الصخور ، لذا هنا تاثير زاوية انحراف البئر على قابلية رفع الصخور سيتم توضيحها في هذه الدراسة. دراسة احصائية تم استخدامها لدراسة قيم قابلية رفع الصخور بوجود زاوية لانحراف البئر مع القيم التي لا تأخذ زاوية انحراف البئر بنظر الاعتبار . النتائج وضحّت بأن زوايا انحراف قليلة لها تأثير ضعيف على قيم قابلية رفع الصخور ، لكن هذه الدراسة يمكن استخدامها على زوايا انحراف عالية مثل الابار المنحرفة و الابار الافقية ، حيث هنا زوايا احراف عالية ستؤدي الى تأثير عالي على قيم قابلية رفع الصخور .

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