Reservoirs and some production issues

Question 1

what controls the flow of fluids through rocks?

Answer 1

size of pores and pore throats.

Question 2

if you take a liquid/gas out of a rock how will it effect temp and pressure?

Answer 2

temp not effected much

pressure decreases

Question 3

If you have a mix of 2 fluids in 1 container….

Answer 3

at some point you will not be able to get 1 out.

Question 4

what % of oil in a reservoir can be extracted with primary recovery (natural drive)

Answer 4

5-30%

Question 5

what % of oil in a reservoir can be extracted with secondary recovery (injecting gas/water/steam into it, forcing additional petrol out)

Answer 5

25-60%

Question 6

how do faults effect fluid migration

Answer 6

Faults may act as seals or conduits (a channel for conveying fluid) to fluid migration.

Question 7

2 ways faults can form seals and trap hydrocarbon accumulations….

Answer 7

1. Juxtaposition or reservoir rock across the fault against low-permeability or impermeable rocks.
2. Fault rock development creating an area of very low- permeability.

Faults may ‘compartmentalise’ a reservoir.