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5/66 PETROLEUM PRODUCTION ENGINEERING FUNDAMENTALS
1. The accuracy of Sachdeva’s choke model can be im- ikoku, c.u. Natural Gas Engineering. Tulsa, OK: Penn-
proved by using different discharge coefficients for dif- Well Books, 1980.
ferent fluid types and well types. nind, t.e.w. Principles of Oil Well Production, 2nd edition.
2. For predicting liquid rates of oil wells and gas rates New York: McGraw-Hill Book Co., 1981.
of gas condensate wells, a discharge coefficient of
C D ¼ 1:08 should be used. omana, r., houssiere, c., jr., brown, k.e., brill, j.p., and
3. A discharge coefficient C D ¼ 0:78 should be used for thompson, r.e. Multiphase flow through chokes. Pre-
predicting gas rates of oil wells. sented at the SPE 44th Annual Meeting held 28–31
4. A discharge coefficient C D ¼ 1:53 should be used for September 1969 in Denver, Colorado. SPE paper 2682.
predicting liquid rates of gas condensate wells. osman, m.e. and dokla, m.e. Has condensate flow through
chokes. Presented at 23 April 1990. SPE paper 20988.
perkins, t.k. Critical and subcritical flow of multiphase
Summary mixtures through chokes. Presented at the SPE 65th
This chapter presented and illustrated different mathemat- Annual Technical Conference and Exhibition held 23–
ical models for describing choke performance. While the 26 September 1990 in New Orleans, Louisiana. SPE
choke models for gas flow have been well established with paper 20633.
fairly good accuracy in general, the models for two-phase perry, r.h. Chemical Engineers’ Handbook, 5th edition.
flow are subject to tuning to local oil properties. It is New York: McGraw-Hill Book Co., 1973.
essential to validate two-phase flow choke models before pilehvari, a.a. Experimental study of subcritical two-
they are used on a large scale.
phase flow through wellhead chokes. Tulsa, OK: Uni-
versity of Tulsa Fluid Flow Projects Report, Septem-
ber 1980.
References
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guo, b., al-bemani, a., and ghalambor, a. Applicability Problems
of Sachdeva’s choke flow model in southwest Louisi-
5.1 A well is producing 40 8API oil at 200 stb/d and no
ana gas condensate wells. Presented at the SPE Gas gas. If the beam size is 1 in., pipe size is 2 in., tem-
technology Symposium held 30 April–2 May 2002 in perature is 100 8F, estimate pressure drop across a
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