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Well-Test Interpretation in High Temperature Deltaic Gas Sands
This paper presents the results of a comprehensive study on a series of pressure build-up tests performed on the exploration/delineation wells and the early development wells of Bongkot field.
Bongkot is a gas condensate field in the Gulf of Thailand, located approximately 600 km South of Bangkok (Fig. 1).
The reservoirs of Bongkot are made up of channels and bars in a fluvio-deltaic and faulted environment with a high geothermal gradient.
Using a large set of build-up test data, variable early and late-time response on the log-log pressure derivatives arc observed, associated with temperature variations during flow and shut-in periods.
A phenomenological study has been carried out to understand and evaluate the effect of the temperature variations on the pressure measurements and to correlate the well-test interpretation with the reservoir geometry.
The understanding of the phenomena affecting the pressure build-up tests has contributed to the optimization of the Bongkot field well testing policy and to the improvement of the reservoir description.
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