1. You have an oil reservoir with the following properties a. Depth 8500 ft b. I

Question

1. You have an oil reservoir with the following properties a. Depth 8500 ft b. Initial reservoir pressure 29 c. Reservoir Temperature 175 F d. Porosity 10% e. Total reservoir area 2700 acres f. Average formation thickness 100 ft g. Average water saturation 25% h- irreducible water saturation 25% i. Oil viscosity 2 cp j. Oil compressibility, 15x10 k. Water compressibility, 5x10 . Water viscosity 1 cp m. Oil Bubble Point pressure 1750 psi n. Gas solubility at bubble point pressure 350 50 psi scf/STB o. Formation Volume Factor at initial rese voir pressure 1.25 BBLISTB 1. Calculate the amount of oil in place in STB 2. Calculate the formation volume factor at bubble point pressure assuming oil compressibility is constant. 3. How much oil will be produced if the average reservoir pressure was reduced to bubble point pressure? 2. You have an gas reservoir with the following properties a. Depth 8500 ft b. Initial reservoir pressure 2950 psi c. Reservoir Temperature 175 F d. Porosity 10% e. Total reservoir area 2700 acres f. Average formation thickness 100 ft g. Average water saturation 25% h. Irreducible water saturation 25% i. Gas viscosity at initial pressure 0.02 cp j. Oil compressibility, 200x10 k. Water compressibility, 5x10 1. Water viscosity 1 cp m. Z factor at initial reservoir conditions 0.97 1. Calculate the amount of gas in place in mscf Please note that the gas constant in field units is R 10.731 ft3 psi R·lb-mol .

Explanation / Answer

amount of oil in place in STB = G(t)= Ah(1-Swt) /  Boi)

= 2700*100*10 (1- 0.25) / 1.25

=2700000*0.75/1.25

= 162*105 SBT

STOIIP = stock tank oil in place, stb

A= area, acre

h = reservoir thickness, ft

= rock porosity, %

Swc =connate water saturation, %

Boi = oil formation volume factor, rb/stb

2) formation volume factor Bg = Psc zt / TscP

=1750* 2950 / 175*300..

=98.33 SCF

3) total amt of oil SBT is 162*105 which is at pressure of 2950

now at bubble pressure of 350 = 162*105 / 350

=46285 SBT

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