While measuring flow rate has been one of the most important key elements involved in the understanding of reservoir behavior and optimizing reservoir management, the idea of installing an oil-water-gas “Multiphase Flow Measuring System (MPFM)” on each individual well is in the spotlight. Japan Oil, Gas and Metals National Corporation (JOGMEC) has been developing an MPFM of the kind, a system that is both trustworthy and easy to set up (Target : possible to measure liquid and gas flow rates within a relative error of +/−10%, water cut within an error of +/−3%).
The system is a batch type MFPM which has a small separator to measure water cut correctly. The procedure for the measuring process is : (i) separating liquid and gas, (ii) measuring gas flow rate with gas meter and (iii) storing liquid in the small tank and calculating water cut and liquid flow rate by liquid level and oil-water surface level measured using differential pressure transmitters. This system could measure liquid and gas flow rates within a relative error of +/−10% and water cut within an error of +/−5%. JOGMEC & Past JAPAN ENERGY DEVELOPMENT Co., Ltd. (JED) conducted a field test of the batch type MPFM at JED's Nakajo oil and gas field from October to November in 2008. The results of the field test were sufficient.
