渗流物理习题

第一章渗流物理作业

(黑油模型) 流体物性

1、A liquid sample from a reservoir whose volume was 280.0 cc under reservoir condition was cooled to 20o C and the pressure released to 1atmosphere. The liquid volume was reduced to 194.0 cc and 4

10

.1⨯standard cc of gas were evolved.

72

Calculate R s and B o at reservoir condition.

2、A laboratory cell, contained 280.0 cc of reservoir liquid at its bubble point of 13.6MPa at 60o C, 18.8 cc of mercury were removed from the cell and the pressure dropped to 10.8MPa. Mercury was then reinjected at constant temperature and pressure and 3

65

.3⨯standard cc of gas were removed leaving 263.5 cc of liquid.

10

The process was repeated reducing the pressure to 1 atm and the temperature to 20o C. Then 4

10

1.1⨯standard cc of gas were removed and 205.9 cc of liquid remained in the cell .Determine:

(1)B ob and R sb at 13.6MPa and 60o C ?

(2)B o, B t, B g, R s, and z 10.8MPa and 60o C?

3、油气分离计算：

Table 1 below gives the results of constant mass study of an oil sample where the volume of an oil sample was measured as a function of pressure at temperature of 100o C, corresponding to the reservoir temperature.

In an another test a sample of oil from the PVT cell at its bubble point and at 100o C were passed through a two stage separator at 1.44MPa and 26o C and 1 atm and 20o C . 55cc of oil were removed from the PVT cell at bubble point condition and 45.3 cc of oil were collected from the last separation stage, 2000 cc of gas at stand conditions were collected during these tests.

In a further test, differential liberation was carried out on a sample of oil at 100o C and the volume of oil remaining measured at each stage. The cumulative standard volume of gas liberated was also reported and the data is given in table 2.

From the results of all these tests, determine:

(a) the bubble point of the reservoir fluid

(b) the oil formation volume factor at 23.8MPa

(c) the solution oil-gas ratio at 3650psig or 12.2MPa

(d) the solution oil-gas ratio and the oil formation volume factor of crude oil when pressure reduced to 6.5MPa .

Table1 Constant Mass Study of Reservoir Fluid at 100o C

Table 2

（组分模型）

4、An oil has the following composition

Component Mole-Fraction

n-butane 0.31

n-pentane 0.39

n-hexane 0.30

What is the API gravity of the oil? Use the ideal solution principles.

5、Calculate the density of the follow liquid at its bubble point of 3000 psia at a reservoir temperature of 200o F using the Standing and Kate correlation.