WELL-TEST LOGGING TO ENDEAVOR MAPPING THE CARBONATES PERMEAB
In the current economic and environmental context, the optimization of long horizontal well completions and the maximization of individual well performance are becoming increasingly important. The challenge is to be able to start a virtuous circle of production efficiency improvement while designing an adapted completion for each well efficiently without compromising the project economy. The cost-effective formation evaluation technique described in this paper allows identifying dynamic heterogeneities along the reservoir rapidly after the drilling of a horizontal well. This key information could then be used to optimize the well completion and treatment. This new approach combines well testing and logging techniques and was initially introduced for the optimization of an unconventional well completion (see Jacques et al., 2019 and Manivannan et al., 2019). The log starts by circulating a low viscous brine that can be injected in the formation through the mudcake. The brine circulation operation is run at the end of the drilling phase, after reaching TD of the drain, while maintaining a constant wellhead pressure at the wellhead. The constant pressure control can be ensured without a specific additional choke device when managed pressure drilling (MPD) is used to drill the formation section. The inlet and outlet flow rates are accurately measured, and their difference gives the formation injection rate with time. The fluid interface location inside the borehole is estimated from the flow rates and pressure readings at the wellhead. Combining these two pieces of information allows deriving the brine injection profile along the open hole. A permeability log can then be derived by inversion. This well test logging technique has been successfully applied for the first time to a horizontal well in a conventional carbonate reservoir. The interpretation results were benchmarked to static conventional openhole logs and validated against the dynamic production log (PLT) performed after the well startup. It opens new perspectives for the optimization of well completions in these carbonate fractured formations where porosity logs might not be a good permeability indicator and where conductive fractures seen on image logs are not always indicative of future production.
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Author(s):
Antoine Jacques, Vincent Jaffrezic, Benoit Brouard, Shafiq Ahmed, Amr Mohamed Serry, Raymond Nguyen
Company(s):
TOTAL SE, BROUARD Consulting, ADNOC Off Shore
Year:
2021