Multiphase Flowmeter Reduces Capital Expenditure and Operating Expenditure and Enhances Flow Assurance in the Uinta Basin

Abstract Several operators are leveraging the capabilities of multiphase flowmeters (MPFMs), strategically integrating them into their digital transformation efforts. This paper presents a case study of an operator producing from the Uinta Basin, a region renowned for its waxy crude, exploring transitional technologies like a full gamma-spectroscopy/Venturi combination surface MPFM that eliminates the need for large conventional test separators while providing continuous online well production monitoring and allocation. As a result, tremendous economic savings were realized due to a significant reduction in capital expenditure (Capex) and operating expenditure (Opex). One of the challenges addressed in this paper was managing the formation of wax deposits on the membrane of the MPFM differential pressure sensor, a critical component for ensuring reliable and accurate flow rate measurement. In this innovative approach, wax deposition was addressed by implementing an automated continuous chemical injection across the MPFM. The real-time monitoring of the differential pressure signature of the full gamma-spectroscopy/Venturi combination surface MPFM enables the optimization of chemical injection. Additionally, a mechanical optimization comprised of a block-and-bleed flange setup was incorporated to allow draining and flushing the MPFM pressure membranes and the passage through the Venturi when clogged with wax. Initially, to address wax build-up in the MPFM, a temporary solution involving hot oil treatment was implemented. The comparison of the oil flow rate from the MPFM and the separator initially suggested effective results. However, after the termination of hot oil treatment, wax accumulation on the pressure membrane increased uncertainty in the measured flow rate. After implementing continuous chemical injection, the comparison of average gas, liquid, and water rates between the MPFM and the test separator showed a variance within 10%, indicating an effective solution for managing flow assurance across the MPFM. Financial incentive was a major driver in assessing the MPFM as it provides on average about USD 98,000 reduction in Capex per well in addition to 20% savings on pipe, valves, and fittings (PVF), 15% savings on supervision and labor costs, and 30% savings on building construction. Additionally, the savings favored facilities with higher well counts. On average, about 12% savings from the standard of one separator vessel per well, equipped with three single-phase measurements (usually orifice plate for gas, turbine for water, and Coriolis for oil). This work illustrates a successful reliability enhancement of a full gamma-spectroscopy/Venturi combination surface MPFM by monitoring the differential pressure signature for early detection of possible flow assurance challenges controlled with the implementation of a continuous chemical injection.