New Correlations for Critical and Subcritical Two-Phase Flow Through Surface Chokes in High-Rate Oil Wells
- Hazim H. Al-Attar (United Arab Emirates University)
- Document ID
- Society of Petroleum Engineers
- SPE Projects, Facilities & Construction
- Publication Date
- March 2010
- Document Type
- Journal Paper
- 31 - 37
- 2010. Society of Petroleum Engineers
- 5.3.2 Multiphase Flow, 1.10 Drilling Equipment, 5.2.1 Phase Behavior and PVT Measurements, 5.3.1 Flow in Porous Media
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- 688 since 2007
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The critical and subcritical multiphase flow through wellhead restrictions of a prolific oil field in the Middle East is investigated, and two sets of new correlations are presented. The first set of correlations is developed by using 40 field tests representing critical flow conditions. The second set of correlations is based on 139 field tests representing subcritical flow conditions of gas/liquid mixtures through wellhead chokes.
For the critical multiphase flow condition, the predicted oil flow rates by the new set of correlations are in excellent agreement with the measured ones. The absolute average percent difference (AAPD) is between 1.88 and 4.37, and the corresponding standard of deviation (SD) is between 2.52 and 6.52. These results are found to be statistically superior to those predicted by other published correlations considered in this work. During the subcritical gas/liquid flow conditions through surface chokes, the accuracy of oil flow rates predicted by the new set of correlations seems to be sensitive to the type and size of the choke being used. For Cameron LD type and 144/64-in. choke, the oil flow rates predicted by the proposed correlation are superior to those predicted by other methods available in the literature, with AAPD of 8.5. However, for smaller choke sizes of 96/64 and 64/64 in., the oil flow rates predicted by the new correlations and other methods are found to be close to each other. For Cameron F type and 144/64-in. choke size, the oil flow rates predicted by the new correlation are closely matched by those predicted by other published methods, with AAPD of 13.7. For smaller choke sizes of 80/64 and 64/64 in., few field tests are available, and the predications of all methods, including the proposed ones, show similar statistical results. The above findings for Cameron F choke also seem to apply to beaned wellhead assemblies for this particular oil field.
|File Size||449 KB||Number of Pages||7|
Achong, I. 1961. Revised bean performance formula for Lake Maracaibo wells.Internal report, Shell Oil Company, Houston, Texas (October 1961).
Al-Attar, H.H. and Abdul-Majeed, G.H. 1988. Revised Bean Performance Equation forEast Baghdad Oil Wells. SPE Prod Eng 3 (1): 127-131.SPE-13742-PA. doi: 10.2118/13742-PA.
Ashford, F.E. 1974. AnEvaluation of Critical Multiphase Flow Performance Through Wellhead Chokes.J. Pet Tech 26 (8): 843-850. SPE-4541-PA. doi:10.2118/4541-PA.
Ashford, F.E. and Pierce, P.E. 1975. Determining Multiphase Pressure Dropsand Flow Capacities in Down-Hole Safety Valves. J. Pet Tech 27 (9): 1145-1152. SPE-5161-PA. doi: 10.2118/5161-PA.
Baxendell, P.B. 1957. Bean performance--Lake Maracaibo wells. Internalreport, Shell Oil Company, Houston, Texas (October 1957).
Fortunati, F. 1972. Two-PhaseFlow Through Wellhead Chokes. Paper SPE 3742 presented at the SPE EuropeanSpring Meeting, Amsterdam, 16-18 May. doi: 10.2118/3742-MS.
Gilbert, W.E. 1954. Flowing and gas-lift well performance. API Drillingand Production Practice 20 (1954): 126-157.
Gozhov, A.J. and Medviediev, V.F. 1962. Critical flow of two-phase fluidsthrough wellhead chokes. Nieffianoic Xoziaistvo-Moskva (11).
Lasater, J.A. 1958. Bubble PointPressure Correlations. J. Pet Tech 10 (5): 65-67:Trans., AIME, 213. SPE-957-G. doi: 10.2118/957-G.
Poettmann, F.H. and Beck, R.L. 1963. New charts developed to predictgas-liquid flow through chokes. World Oil (1963): 95-101.
Ros, N.C.J. 1959. Theoretical approach to the study of critical gas-liquidflow through beans. Internal report, Shell Oil Company, Houston, Texas.
Standing, M.B. 1947. A Pressure-Volume-Temperature Correlation for Mixturesof California Oils and Gases. API Drilling and Production Practice(1947): 275.