At present, no standard of presenting multiphase flow meter (MPFM) uncertainties has been accepted by industry. Consequently, vendors’ specifications may only indicate velocity and component fraction uncertainties, while customers will typically need to know the overall uncertainty of the hydrocarbon (gas or oil) flow rate. Moreover, comparisons between different meters, meter locations, and metering strategies are difficult without the combined uncertainties of the hydrocarbon measurement. A simple uncertainty analysis (UA) is presented as a means of combining individual measurement uncertainties to determine an overall uncertainty for one of the mixture components, e.g., oil rate. The results are displayed as contour lines of constant oil rate uncertainty on plots of gas fraction versus water cut. Examples illustrate how the uncertainty of oil rate measurement might be reduced by operating the meter at higher pressure, or employing partial separation strategies, and limitations of such strategies.

Issue Section:
Technical Papers
Topics:
Measurement uncertainty, Multiphase flow, Uncertainty, Flow (Dynamics), Pressure, Separation (Technology), Uncertainty analysis, Water
1.
Coleman, H. W., and Steele, G. W., 1989, Experimentation Uncertainty Analysis for Engineers, John Wiley & Sons, New York, NY.
2.
Kartoatmodjo, T., and Schmidt, Z., 1994, “Large Data Bank Improves Crude Physical Property Correlation,” Oil & Gas Journal, July 4, pp. 51–55.
3.
Kline
S. J.
, and
McClintock
F. A.
,
1953
, “
Describing Uncertainties in Single-Sample Experiments
,”
Mechanical Engineering
, Vol.
75
, Jan., pp.
3
–
8
.
4.
Kouba, G., 1986, “Horizontal Slug Flow Modeling and Metering,” Ph.D. dissertation, University of Tulsa, Tulsa, OK.
5.
Kouba, G., and Shoham, O., 1990, “A Non-Intrusive Flow Metering Method for Use in Two-Phase Intermittent Flow in Horizontal Pipes,” SPEJ Journal of Production Engineering, Nov., pp. 373–380.
6.
Liu, K. T., and Kouba, G. E., 1994, “Coriolis-Based Net Oil Computers Gain Acceptance at the Wellhead,” Oil & Gas Journal, June 27, pp. 42–46.
7.
Liu, K. T., and Revus, D. E., 1988, “Net-Oil Computer Improves Water-Cut Determination,” Oil & Gas Journal, December 9.
8.
Measurement Uncertainty for Fluid Flow in Closed Conduits, 1983, ANSI/ASME MFC-2M.
9.
Millington, B. C., 1991, “An Uncertainty Analysis for the Proposed Design of the NEL/SGS Multiphase Flowmeter,” NEL Flow Measurement Memo 418, East Kilbride, Glasgow, National Engineering Laboratory, Sept.
10.
Millington, B. C., and Whitaker, T. S., 1992, “Multiphase Flowmeter Measurement Uncertainties,” North Sea Measurement Workshop, October 26–29.
11.
Millington, B. C., 1992, “Development of a Multiphase Flowmeter for the Oil Industry,” Final Report MPF001, National Engineering Laboratory, Oct.
12.
Perdue, J. M., 1997, “Five Critical Technologies Will Determine Industry’s Future Success,” Hart’s First Look, SPE, Aug., p. 1.
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