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Modeling of Cyclic Water Injection, East Unity Oil Field – Sudan

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Dr.Tagwa Ahmed Musa Mohamed,Dr. Ahmed Abdelaziz Ibrahim Elrayah,2012, Modeling of Cyclic Water Injection, East Unity Oil Field – Sudan,Journal of Science and Technology,13 (1) ,pp:26-35

By Dr.Tagwa Ahmed Musa Mohamed,Dr. Ahmed Abdelaziz Ibrahim Elrayah,
Water flooding numerical model reseriow, Porosity , Permeability, water - cut .
In this study cyclic water flooding method using numerical model was tested in a middle to a high permeability zones and compared with the actual water injection method used in the field. The study was carried out on a Sudanese oil reservoir which resulted of fluvial and lacustrine deposition. The field is a highly complex anticline with major flanking faults extended to east and west. The reservoir highly heterogeneous is characterized by mid to high porosity and permeability. The actual water injection method used in East Unity is a continuous method (twelve months per year) through a three injection wells. In this study, cyclic water injection was evaluated in Aradeiba formation simulating several cyclic water injection scenarios by "injection/no injection" time ratios such as 2:1, 1:1, and 1:2. Improved sweep, accelerated oil production, and reduced water-cut were the main advantages that could be obtained from cyclic waterflooding. The total oil production was predicted to show an increase of 2% from the targeted reservoirs after 10 years, while the cumulative water injection is expected to decrease by 15 – 18%. However, 28.22% of the oil in the area can be produced during 10 years using the scenario 2:1 which is expected to result in an increase of 2.54% compared with the water injection method used.
فى هذه الدراسة تم اختبار طريقة حقن الماء الدورى فى المكامن ذات النفاذية المتوسطه والعاليه وقورنت بالطريقة الحالية للحقل وذلك باستخدام التمثيل العددى. تمت الدراسة فى حقل سودانى غير متجانس بدرجة كبيرهو يمتاز بمساميه ونفاذية متوسطه الى عالية. طريقة الحقن الحالية بالحقل هى الطريقة المستمرة (12 شهر بالسنه) عبر ثلاثة ابار حقن. فى هذه الدراسة تم تقييم طريقة الحقن الدورى بطبقة عرديبة. تم بناء عدد من السيناريوهات "حقن/عدم حقن" بنسب زمنيه 2:1 ، 1:1 ، و 1:2. أدت نتائج الحقن الدورى الى تطور فى الازاحه ، زيادة فى انتاج النفط التراكمى، وتقليل نسبة المياه المنتجه. من هذه الدراسة اتضح ان إستخدام الحقن الدورى يزيد نسبة النفط الكلى المنتج بنسبة 2% عن الانتاج بالطريقة المستمرة بعد 10 سنوات من الانتاج وتنقص كمية المياه الكلية المنتجه بنسبة 15 -18 %. كما انه يمكن انتاج نسبة 28.22 % من الاحتياطى النفطى اذا تم استخدام الحقن الدورى 2:1 والتى تمثل زيادة بنسبة 2.54 % مقارنة بطريقة الانتاج الحالية.
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