Abstract

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.