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Waterflooding in a Snapshot’ – Lecture by Saad Ibrahim, Petro Management Group Ltd.

Posted on 06 March 2017

At the beginning of his lecture, Mr Ibrahim made a short presentation about his company, Petro Management Group Ltd. He told that the company provides petroleum-related technical consulting and training all over the world.

The lecture consisted of several parts: a general overview of oil recovery methods; reservoir characterization; enhanced oil recovery (EOR), waterflooding design and performance monitoring. All points were explained in simple terms and illustrated with vivid examples.

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Speaking about the importance of good quality reservoir characterization for the success of waterflooding, Mr Ibrahim introduced a general scheme of the reservoir modelling process, including the analysis of the dynamic data and focus on reservoir heterogeneity. 

During the discussion about the waterflooding design, the lecturer focused on the EOR screening process and the relevance of conducting proper laboratory tests prior to taking any action on the field. Mr Ibrahim also pointed out the value of timely start of the waterflooding, especially in certain conditions, such as highly under-saturated fields. He revealed several simple ways of calculating the injection rate and emphasised the importance of surface injection control, which is currently being neglected at many companies. Apart from that, he introduced a quick method for estimating fracture pressure, and made a brief overview of incremental oil calculation methods, explaining the upsides and downsides of each method.

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On the example of Bakken, the Lower Shaunavon formation, Canada, Mr Ibrahim demonstrated the application of multi-stage frac horizontal wells for waterflooding.

Finally, the lecturer introduced several ways of monitoring the performance of waterflooding, such as comparison of predicted and actual performance, keeping track of the voids replacement ratio, maintaining water injectivity in the well, conducting tracer surveys, and creating the formation injection profile through temperature modelling and noise profiling. He supported his words with the example of Masila Block, Yemen, where the check-valve effect (high layer productivity versus very low injectivity) took place, and thus periodical acid jobs were necessary. The hall plot helped determine the right timing for the acid job.

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Mr Ibrahim concluded with another case study: Lost Hills, Belridge Oil Fields, USA, where the use of waterflooding helped avoid the subsidence of the ground surface.

Although the lecture lasted for two hours and there wasn't a single break, the audience listened very attentively and interacted with the lecturer. Both the students and the professors found the lesson very informative and interesting.