Reservoir basics

In oil reservoirs when initial reservoir pressure is equal to bubble point pressure such Reservoir is called.....?

• Undersaturated oil reservoir

• Saturated oil reservoir

• Gas cap reservoir

• None of the above

Type of gas reservoir, GOR: 8000-70000 scf/STB, Gravity: 50 API, Liquid water-white or slightly colored

• Wet gas

• Dry gas

• Retrograde gas condensate

• Near critical gas condensate

Which porosity is important and required to reservoir Engineer

• Absolute porosity

• Effective porosity

• Original porosity

• Induced porosity

Calculate Pore Volume, A:640 acre, t: 10ft, Swc: 0.25, Porosity: 15%

• 7447680 bbl

• 8567860 bbl

• 7.2kk bbl

• None

Residual oil saturation is associated with nonwetting phase when it is displaced by a wetting phase.

• True

• False

Wettability of water is greater than oil due to high contact angle with solid surfaces

• Right

• Wrong

• Possible

• Absolutely wrong

Calculate Pc in oil water system; Oil water surface tention: 25 dynes/cm, contact angle: 30 Deg, capilary radius:0.0001 cm

• 48000 psi

• 6.28 psi

• 8.64 psi

• Can't calculate with above data

Assumptions of Darcy law

• Linear flow

• Steady state flow

• Incompressible fluids

• Heterogeneous formation

• Saturated reservoir

Reservoir aquifer systems classified on the basis of

• Degree of pressure maintenance

• Flow regimes

• Flow geomtries

• Outer and inner boundary condition

• Compressibility of aquifer rock

Which is not primary recovery mechanism

• Expension drive

• Depletion drive

• Water drive

• Combination drive

• Undersaturated res drive