fluid sampling

The purpose of sampling is:

? To determine the physical properties of the reservoir fluids, such as:

1. Bubble-point pressure

2. Formation volume factor

3. Solution gas-oil ratio

4. Total formation volume factor

5. Coefficient of isothermal compressibility of oil

?6. Oil viscosity

7. Z-factor 8. Formation volume factor of gas

?9. Gas viscosity.?

A sample can obtain in two ways:

1)Bottom-hole or subsurface sampling: The well is shut in and liquid at the bottom of the wellbore is sampled.

2)Separator or Surface Sampling: The production rate is carefully controlled, and separator gas and liquid are sampled. The reservoir must be?sampled before the pressure drops below the bubble-point pressure.

No sampling method will give the original reservoir sample after the bubble-point pressure drop.

?Reservoir Fluid Study? discusses the five major tests performed during a reservoir fluid:

1. Compositions measurements

2. Flash Vaporization

3. Differential Vaporization

4. Separator Test

5. Viscosity measurements

?Reference:

https://www.slideshare.net/SaifUrRehman69/sampling-69695561