Problem 1
Determine the viscosity of pure methane and pure iso-butane components at 500 psi pressure and 300°F. What is the corresponding value of a 25%/75% Mixture of these two components and at the same pressure/temperature conditions?
Problem 2
The permeability of a core sample (length 12 cm and diameter 3.8cm was measured at 60°F using helium as the testing fluid. The outlet pressure remained the same and equal to atmospheric. The following data were reported with the gas flow rate reported at the core's effluent conditions:
| Inlet Pressure (atm) |
1.15 |
1.485 |
1.71 |
2.3 |
| Gas Flow Rate (cc/s) |
5 |
18 |
32 |
60 |
a. Calculate the core liquid permeability
b. What is the value of the klinkenberg constant
Problem 3
A wellbore with 7 inches diameter was completed in a 80 m thick formation containing dry gas. The pressure in the reservoir is 3000 psi and stays constant for radii larger than 500 m from the well. The well is neither damaged nor stimulated, and the well bottomhole pressure is 1250 psi. the pereablity of the reservoir is 40 mD and the gas viscosity at average reservoir pressure is 0.015 cp
a. If the pressure at the wellhead is 14.7 psi, what is the well's gas volumetric flow rate at wellhead conditions considering ideal gas behavior?
b. How will you result change if the gas behaves non-ideally? Consider the reservoir pressure to be 200 oF and the gas pseudo critical pressure and temperature 700 psi and 500oR.
Problem 4
O as flows from a reservoir at outer reservoir pressure of 2500 psi into a well at 1000 psi re. If Darcy's pressure law predicts the average flow rate to be 750,000 ft3/D, what is the actual volumetric flow into well? What are the assumptions involved with your calculations?