Reservoir Description Insights from Inter-well Gas Tracer Test
- Abdulaziz Al-Qasim (Saudi Aramco) | Sunil Kokal (Saudi Aramco) | Sven Hartvig (RESMAN) | Olaf Huseby (RESMAN)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition & Conference, 11-14 November, Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- Inter-well, Insights, Reservoir, Gas, Description
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- 98 since 2007
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Tracer technology has gained considerable attention recently as an effective tool in the reservoir monitoring and surveillance toolkit, particularly in IOR operations. Gas flow paths within the reservoir can be quite different from liquid (oil and water) flow path. This is primarily due to gravity override, and differences in density and relative permeability between the gas and liquid phases.
Inter-well gas tracer test (IWGTT) is a key monitoring and surveillance tool for any IOR projects. IWGTT should be designed and implemented to track the flow behavior of gas phase. The test generally entails injecting a small amount of unique perflouro-hydrocarbon tracers into the gas phase injectant stream. IWGTT have been conducted on a limited number of fields across the globe, and sample results of some will be presented.
The sampling frequency of the tracers from the producers should be designed carefully to collect the necessary data that will provide insights about the connectivity between the injectors and producers well pairs, gas breakthrough times ("time of flight"), and possible inter-well fluid saturations. Different fit-for-purpose unique tracers can be deployed in the subject injector(s) stream and their elution can be monitored in the corresponding up-dip producer(s).
In addition to reservoir connectivity and break-through times between injector and producer pairs, an IWGTT helps in optimizing WAG operations and production strategies for gas injection projects, improve sweep efficiency and ultimately enhance oil recovery. It can also be used to identify source of inadvertent gas leakage into shallow aquifers or soil gas, and help in the planning and placement of future wells.
This paper reviews the workflow and necessary logistics for the successful deployment of an inter-well gas tracer test. It will provide the best practices for designing, sampling, analyzing and interpretation of a gas tracer deployment. The paper also highlights the benefits of gas tracer data and their usefulness in understanding well interconnectivity and dynamic fluid flow in the reservoir. The results can be used to refine the reservoir simulation model and fine tune its parameters. This effort should lead to better reservoir description and an improved dynamic simulation model. The challenges associated with IWGTT will also be shared.
|File Size||889 KB||Number of Pages||13|
Sanni M L, Al-Abbad M A, and Kokal S L, Dugstad Ø, Hartvig S and Huseby O: "Pushing the envelope of residual oil measurement: A field case study of a new class of Inter-well chemical tracers". SPE paper 181324, SPE Annual Technical Conference and Exhibition, Dubai, UAE, 26–28 September 2016, published in peer-reviewed form by Sanni et al. in J. Petroleum Science and Engineering, Vol 163 pp538-545 (2018).
Viig S. O., Juilla H., Renouf P., Kleven R., Krognes B., Dugstad Ø., Huseby O.K. 2013. Application of a New Class of Chemical Tracers To Measure Oil Saturation in Partitioning Interwell Tracer Tests. SPE paper no. 164059. 2013 SPE International Symposium on Oilfield Chemistry, Apr 08 – 10, the Woodlands, TX, USA.