Technical Paper: Skin Calculation and Other Applications with New Sonic Measurement in the Gulf of Thailand

Society: IPTC
Paper Number: 14189
Presentation Date: 2012
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Since the first sonic logging tool used for the petroleum industry in 1950s, we have seen many generations of acoustic measurements. The hardware and software changes made over the decades focused mainly on the improvements of compressional and shear measurements which are one dimensional in the near-wellbore region. To understand the complicated reservoirs today, there is a need to look at the compressional and shear slowness in three dimensions.

The present wireline sonic logging tool that is equipped with a long receiver array and near and far monopole transmitters enables us to quantify the compressional slowness of near-wellbore damaged formation and the far-field undisturbed formation. This radial measurement adds an extra dimension to reservoir characterization.

The compressional radial profiling clearly shows the formation damage across part of the reservoir. By combining it with the pressure drawdown mobility taken from undamaged and damaged zones, one can, for the first time, measure the mechanical skin just after drilling. The information is available at the wellsite. It helps to optimize the real-time data acquisition and completion selection.

The fluid identification is one of the challenges in the deeply invaded reservoirs. The depth investigation of new sonic measurement is much deeper than conventional neutron density logs and previous sonic logs. Other applications including gas detection in deeply invaded reservoirs provided unique solutions in the Gulf of Thailand.

The field example also demonstrates an enhancement in vertical resolution with the multiple-shot processing technique. This is much needed for evaluating the thin reservoirs.

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