Absolute Permeability Using a Gas

Only available on StudyMode
  • Download(s) : 553
  • Published : February 14, 2011
Open Document
Text Preview
PGEG381 L50
Rock Mechanics & Reservoir Laboratory
Spring 2010

Lab Session No.5
Absolute Permeability Using a Gas

Table of Contents

1.0 Abstract ……………………………………………2
2.0 Equipments used ………………………………………2-3

3.0 Test Procedures ……………………………………...3-5
4.0 Results ………………………………………………….5-7

5.0 Discussions………………………………………………8

6.0 Conclusion and Recommendations……………….…..8

7.0 Questions and answers…………………………………8-9

8.0 References……………………………………………...9

Appendices

1.0Abstract

The purpose of this session is to demonstrate the concept of a single phase gas flow through a porous media. The method that used in this lab is the nitrogen gas (Reslab digital gas permeameter). In addition, the gas flow expressed by the Darcy’s equation which relates volumetric flow and pressure drop with the properties of the fluid and media.

The permeability is the production capacity of hydrocarbon reservoirs because it measure of how a reservoir fluid moves through the interconnected rock pores. It is usually measured at a confining pressure of about 300 to 400 psi on both horizontal and vertical core plugs. Permeability information play a role in determining where in the reservoir production tests should be performed.

In this report we are going to show the result that we obtained from the experiment as well as the discussion. Then on the conclusion the result will be given with a suggested recommendations. The key result is that the gas permeability is close to each other in both methods by equation and slope. A and C samples are sandstone, for this reason their permeability’s are within 100 and 1000 md. Moreover, their permeability’s are within 50 and 250 which prove that the quality of the permeability’s is good.

2.0 Equipments used

In this experiment the permeability of compressed dry nitrogen gas will be determined using the following equipments:

The ResLab steady state digital gas permeameter as shown in figure 1.0.

Figure 1.0: Reslab digital gas permeameter
As shown in figure 2.0 the digital vernier caliper to measure the dimensions such as the diameters and lengths for each sample.

Figure.2.0: A photograph of the digital vernier caliper

In addition, the material that is used in this experiment was: •Berea sandstone core plug samples as shown in figure 3.0.

Figure.3.0: A photograph of the sandstone core plug samples

3.0Test Procedures

The test procedures for this experiment as the following steps:

1.Berea sandstone core plug was prepared.
2.Using a digital vernier caliper to measure dimensions of the core plug (length and diameter). 3.Then we turn the power of the digital gas permeameter ON and let it warm up. 4.Check that both the {3-way} and {flow selector} valves are CLOSED.

5.Open the nitrogen gas cylinder valve and supply a confining pressure (pressure applied on the core holder sleeve) of 16 bar. 6.Regulate the second nitrogen gas cylinder to allow the nitrogen gas flow through the core plug sample at 2 bar maximum. 7.Turn on the vacuum pump and slowly turn the {3-way valve} to “Vacuum” and let it run for few seconds to be able to load the core sample in the core holder rubber sleeve. 8.Open on the threaded core holder upper end-piece a few turns and twist the lower end-piece clock-wise and pull the entire end-piece downwards. 9.Place the core sample on top of the lower end-piece, guide the sample and end-piece upwards- and inside the core holder and twist the lower end-piece counter clock-wise until it is secured in the bayonet coupling. As shown in figure 4.0. 10.Close the threaded upper end-piece until you feel contact with the core sample.

Figure 4.0: Sample mounting in the quick release hasseler type core holder

11.Turn the {3-way...
tracking img