This paper presents a workflow method that has been designed to improve well placement accuracy, enhance decision-making and decrease cycle time through rapid geologic model updates. This workflow was applied successfully to a horizontal well located in a giant oil and gas field offshore Abu Dhabi, United Arab Emirates.

This workflow involves geomodeling, well design, synthetic log creation, real-time geosteering, and updating the geological model while drilling.

Drilling a horizontal well in this environment presents several challenges due to complex geology, heterogenous carbonate reservoir and layer thickness. In addition, there are many uncertainties reflected in the 3D geological model and while drilling.

The primary aim of this workflow is to minimize drilling time with maximum efficiency and optimum well placement. This is achieved through designing the well in the same model centric environment where the geological model was built allowing access to all available data and information for accurate well placement. Secondly, to reduce non-visible loss time and take faster decisions using real-time information. Thirdly, to evaluate associated geological uncertainties in 3D models. Finally, the use of the latest technology available in the market to meet field development requirements.

Great value was added when a 3D model was generated and updated in real time, in addition to the forward-modeling technique that assists the operation geologist to geosteer within the thin layer of the heterogeneous carbonate reservoir in order to achieve the optimum well placement in the minimum amount of time.

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