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Problemas Capitulo 2
Properties of oil and natural gas

2.1.- Estimate the density of 25ºAPI gravity dead oil at 100 ºF.

Datos
Densidad | | | 25 | API |
Temperatura (t) | | 100 | °F |
°API=141.5γ0-131.5
γ0=141.5°API+131.5
γ0=141.525+131.5
γ0=0.904
γ0=ρoρw
ρo=ρw(γ0)
ρo=62.4 lb/ft3(0.904)
ρo=56.410 lb/ft3

2.2.- The solution gas–oil ratio of a crude oil is 800scf/stb at 3,000psia and 120ºF. Given the following PVT data:

Bubble-point pressure: 2,500 psia
Oil gravity: 35 8API
Gas-specific gravity: 0.77 (air ¼ 1),

Estimate densities and viscosities of the crude oil at 120 8F, 2,500 psia, and 3,000 psia.

Datos
Presión(P) | | | 4475 | psia |
Temperatura (t) | | 140 | °F |
Presión de punto de Burbuja(Pb) | 2745 | psia |
Stock tank oil gravity | | 35| °API |
Solution gas oil ratio(Rs) | | 600 | scf/stb |
Gravedad específica del gas (g) | 0,77 | |

=0.8498

=44.8995

2.3.- For the gas composition given below, determine apparent molecular weight, specific gravity, pseudocritical pressure, and pseudo-critical temperature of the gas:

Component | Mole Fraction |
C1C2C3i-C4n-C4i-C5n-C5C6C7þN2CO2H2S |0.7650.0730.0210.0060.0020.0030.0080.0010.0010.0600.0400.020 |

COMPONENTES | Yi | Mwi | YiMWi | Pci(psia) | YiPci(psia) | Tci(°R) | YiTci(°R) |
C1 | 0,765 | 16,04 | 12,2706 | 673 | 514,845 | 344 | 263,16 |
C2 | 0,073 | 30,07 | 2,19511 | 709 | 51,757 | 550 | 40,15 |
C3 | 0,021 | 44,1 | 0,9261 | 618 | 12,978 | 666 | 13,986 |
i-C4 | 0,006 | 58,12 | 0,34872 | 530 | 3,18 | 733 | 4,398 |
n-C4 | 0,002 | 58,12 |0,11624 | 551 | 1,102 | 766 | 1,532 |
i-C5 | 0,003 | 72,15 | 0,21645 | 482 | 1,446 | 830 | 2,49 |
n-C5 | 0,008 | 72,15 | 0,5772 | 485 | 3,88 | 847 | 6,776 |
C6 | 0,001 | 86,18 | 0,08618 | 434 | 0,434 | 915 | 0,915 |
C7+ | 0,001 | 114,23 | 0,11423 | 361 | 0,361 | 1024 | 1,024 |
N2 | 0,06 | 28,02 | 1,6812 | 227 | 13,62 | 492 | 29,52 |
CO2 | 0,04 | 44,01 | 1,7604 | 1073 | 42,92 | 548 | 21,92 |H2S | 0,02 | 34,08 | 0,6816 | 672 | 13,44 | 1306 | 26,12 |
| | Peso molecular aparente | 20,97403 | Ppc= | 659,963 | Tpc= | 411,991 |
| | Gamma g | 0,7232424 | | | | |
| | Sgr Aire | 29 | | | | |

2.4.- Estimate gas viscosities of a 0.70-specific gravity gas at 200 ºF and 100 psia, 1,000 psia, 5,000 psia, and 10,000 psia.

| | | | | 100 psi | 1000 psi | 5000 psi |Presión pseudo-crítica | | | | | 694,65 | 694,65 | 694,65 |
Temperatura pseudo-crítica | | | | 361,142 | 361,142 | 361,142 |
Viscosidad del gas incorrecta a 14.7 psia | | | 0,012269967 | 0,01226997 | 0,0122699 |
Correccíon de nitrógeno para viscosidad del gas a 14.7 psia | | 0,000827643 | 0,000827643 | 0,0008276 |
Correccíon de dióxido de carbono para viscosidad a 14.7 psia |0,000386679 | 0,000386679 | 0,0003866 |
Correccíon de sulfito de hidrógeno para viscosidad a 14.7 psia | 4,82976E-05 | 4,82976E-05 | 4,8276E-05 |
Viscosidad del gas correcta a 14.7 psia | | | | 0,013532587 | 0,013532587 | 0,0135325 |
Presión pseudo-reducida | | | | | 0,143957389 | 1,439573886 | 7,1978694 |
Temperatura pseudo-reducida | | | | 1,827535983 | 1,827535983 | 1,8275359 |r | | | | | | 0,548162352 | 0,679292051 | 1,1864092 |
Viscosidad del gas (g) | | | | | 0,012810875 | 0,014605878 | 0,0242530 |

2.5.- Calculate gas compressibility factors and densities of a0.65-specific gravity gas at 150 ºF and 50 psia, 500 psia, and 5,000 psia with the Hall–Yarborough method. Compare the results with that given by the Brill and Beggs correlation. What is yourconclusion?

De acuerdo al programa properties of gas.xls programado anteriormente nos queda la siguiente tabla:

| Método de Beggs | Metodo Hall-Yarborough |
Presión pseudo-crítica | | 697,164 | 375.641 |
Temperatura pseudo-crítica | 345,357 | 691.799 |
Presión pseudo-reducida | | 7,17191364 | 1.7569 |
Temperatura pseudo-reducida | 1,76628822 | 0.5691 |
A | | | 0,54285179...
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