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18/280 PRODUCTION ENHANCEMENT
beggs, h.d. Production Optimization Using NODAL Ana- 18.3 Consider a 6-in. pipeline that is 20 miles long.
lysis, 2nd edition. Tulsa: OGCI, Inc., Petroskils, LLC., Assuming that the compression and delivery pres-
and H. Dale Beggs, 2003. sures will remain unchanged, calculate gas-capacity
brown, k.e. The Technology of Artificial Lift Methods, increases using the following measures of improve-
ment: (a) replace 10 miles of the pipeline by a 8-in.
Vol. 2a. Tulsa, OK: Petroleum Publishing Co., 1980. pipeline segment; (b) place an 8-in. parallel pipeline
edinburgh Petroleum Services. FloSystem User Documen- to share gas transmission; and (c) loop 10 miles of the
tation. Edinburgh: Edinburgh Petroleum Services, pipeline with an 8-in. pipeline segment.
Ltd., 1997. 18.4 The gas lift performance data of four oil wells are as
E-Production Solutions. ReO User Documentation. follows: If a total lift gas injection rate of 12 MMscf/
Edinburgh: E-Production Solutions, 2004. day is available to the four wells, what lift gas flow
Fekete Associates. Fekete Production Optimization. Fekete rates should be assigned to each well?
Associates, Inc., Calgary, Canada, 2001.
guo, b. and ghalambor, a. Natural Gas Engineering Lift gas Oil production rate (stb/day)
Handbook. Houston, TX: Gulf Publishing Company, injection rate
2005. (MMscf/day) Well A Well B Well C Well D
standing, m.b. A set of equations for computing equilib-
rium ratios of a crude oil/natural gas system at pres- 0.6 80 740 870 600
sures below 1,000 psia. J. Petroleum Technol. Trans. 1.2 145 1,250 1,450 1,145
AIME 1979;31(Sept):1193. 1.8 180 1,670 1,800 1,180
standing, m.b. Volume and Phase Behavior of Oil Field 2.4 210 1,830 2,100 1,210
Hydrocarbon Systems, 9th edition. Dallas: Society of 3 235 1,840 2,350 1,235
3.6 250 1,845 2,500 1,250
Petroleum Engineers, 1981.
4.2 255 1,847 2,550 1,255
4.8 259 1,845 2,590 1,259
5.4 260 1,780 2,600 1,260
Problems 6 255 1,670 2,550 1,255
18.1 Analyze the dynamometer card shown in Figure 18.7
(scale ¼ 1: 1:5) assuming the following parameter
values:
S ¼ 40 in.
N ¼ 20 spm
C ¼ 12,500 lb=in.
18.2 Perform flash calculation under the following separ-
ator conditions:
Pressure: 500 psia
Temperature: 150 8F
Specific gravity of stock-tank oil: 0:85 (water ¼ 1)
Specific gravity of solution gas: 0:65 (air ¼ 1)
Gas solubility (R s ): 800 scf/stb

Gas Composition
Compound Mole fraction

C 1 0.6899
C 2 0.0969
C 3 0.0591
i-C 4 0.0439
n-C 4 0.0378
i-C 5 0.0157
n-C 5 0.0112
C 6 0.0081
C 7þ 0.0101
N 2 0.0094
CO 2 0.0021
H 2 S 0.0058