A to Z of Gas Tracers - A Decade of Learning and Experience
- M. N. Khan (Abu Dhabi Marine Operating Company) | H. Iwama (Abu Dhabi Marine Operating Company) | A. AL-Neaimi (Abu Dhabi Marine Operating Company) | O. AL-Shehhi (Abu Dhabi Marine Operating Company) | M. Chatterjee (Tracerco)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition & Conference, 7-10 November, Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2016. Society of Petroleum Engineers
- 7.3.3 Project Management, 5.6 Formation Evaluation & Management, 5.6.5 Tracers, 5 Reservoir Desciption & Dynamics, 5.4.2 Gas Injection Methods, 5.4 Improved and Enhanced Recovery, 5.5 Reservoir Simulation
- Reservoir Characterization, Gas Movement, Reservoir Dynamics, Tracers, Lesson Learned
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- 176 since 2007
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In interwell tracer studies, reservoir complexities often make tracer breakthrough time difficult to assess. Although reservoir simulation studies serve as an effective tool in predicting a breakthrough, the tracer behavior in the real porous media sometimes present fascinating surprises. The proposed paper discusses a crestal gas injection project that was carried out in a super-giant heterogeneous carbonate oil field operated by ADMA-OPCO.
The field has been on production since 1960s with peripheral water and crestal gas injection as the current means of maintaining the reservoir energy. In 2006 a crestal gas injection project was initiated to support the production from the wells lying away from periphery. Alongside, a tracer study was initiated to track the injected gas movement and hence to find out the effective distribution pattern of the injected gas.
The tracer deployment was intentionally delayed by two years to equalize the crestal pressure distribution and to observe the natural injection gas diffusion pattern. The simulation results predicted a prolonged breakthrough period for the injected tracers, and therefore, the sampling scheme was designed accordingly. Extensive faulting across the field and the changes in the reservoir conditions between tracer injection and analysis period made the project even more challenging. After 10 years of tracers' injection, an extensive study was carried out to review the initial design assumptions and to fine tune the prediction models. As a result an optimized/focused tracer surveillance strategy was developed and implemented.
The proposed paper tracks an interesting and thought provoking journey of the tracers inside the reservoir that has not only helped reservoir management team to better understand the reservoir characteristics, but it has also identified the gaps in the tracer project design and execution strategies. The indispensable experience gained during the past 10 years, starting from the tracers design, the project execution and the integration of the results, has tremendously improved the learning curve of the ADMA-OPCO and all future tracer surveillance project strategies are designed based on the actual learning from this project.
For a giant heterogeneous field like the one discussed in this paper, the investment return time for a tracer surveillance project can be nerve wracking, which requires patience, careful continuous assessment and adherence to the project plan. Besides sharing the lesson learnt, this paper also explores the added benefits of the tracer studies.
|File Size||1 MB||Number of Pages||11|