Enhancements in Fraction Measurements and Flow Modeling for Multiphase Flowmeters
- Alexandre Lupeau (OneSubsea) | Guillaume Jolivet (Schlumberger) | Damien Chazal (Schlumberger) | Massimiliano Fiore (Schlumberger) | Charles Toussaint (Schlumberger) | Benoit Fournier (Schlumberger) | Florian Hollaender (Services Techniques Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 27-29 October, Amsterdam, The Netherlands
- Publication Date
- Document Type
- Conference Paper
- 2014. Society of Petroleum Engineers
- Multiphase Flow Meter, Production monitoring, MPFM, Fluid mechanics
- 2 in the last 30 days
- 388 since 2007
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Multiphase Flowmeters (MPFM) have been used since the early 1990’s in the oil and gas industry and have gained acceptance in many environments. They have been considered to be the primary metering option for a wide range of applications from heavy oil to wet gas. The combination of operational benefits, measurement robustness, demonstrable accuracy and auditability has brought them from the status of new, unproven technology to that of mainstream metering option.
With more than a decade of experience acquired using venturi/gamma-ray multiphase flowmeters, further gains in measurement quality and operational robustness have been achieved. This paper will illustrate how enhancements in fraction measurements using multi-energy gamma ray attenuation and a more comprehensive analysis of the gamma-ray spectrum have been developed and implemented to provide greater measurement accuracy and stability, leading to enhanced performances in multiphase flow measurements.
Another area of improvement that has been pursued is in the field of modeling of multiphase flows through a venturi tube. Historically, single-phase flow equations have been used, being adapted to multi-phase flows by semi-empirical means to account for their complexity. While such models have proven robust for most standard applications, they can reach some limitations in particular conditions. This paper will present how the use of a more dynamic model considering the nature of the flow has led to improved accuracy of multiphase flow measurements.
This paper will both present the scientific basis for the new enhancements as well as illustrate the accuracy gains achieved based on hundreds of flow loop test points, ultimately leading to the quantification of the accuracy gains obtained through those technological improvements.
Since their early development and introduction in the late 1980’s and early 1990’s, multiphase flow meters (MPFM) have generated significant interest in the industry. The primary drivers were initially to obtain production estimates from individual wells in conditions where the use of test separators was impossible of prohibitively expensive (subsea installations, small offshore platforms with limited available space), but have since gained acceptance across the industry. It is estimated today that more than 5,000 multiphase flow meters have been permanently installed with strong growth forecasted in years to come (Falcone et Al., 2011; Yoder, 2013). This covers a wide range of applications from subsea wellhead or riser base installations, to surface wellheads, test headers, trunk line monitoring or custody transfer measurements (Al-Hassaini et al 2012, Syre et al. 2013). In addition, MPFM have been deployed as mobile testing units used in lieu of mobile test separators in applications from exploration and appraisal to production. Multiphase flow meters are now being used in cases where deployment environments, facilities design, operational constraints but also measurement quality are critical and make them the best options. For instance, a large number of subsea developments are now based on the use of commingled riser production making individual well testing impossible using surface facilities and where subsea MPFM are proving extremely valuable (Jackson et al. 2012). The same logic of ease of use applies at surface in remote locations (Navarette et al. 2010) but also in operations where MPFM have proven to be reliable and are even considered as references against tests separators (Al-Hammadi et al. 2012).
|File Size||5 MB||Number of Pages||19|