How to calculate pressure of a mixture of oil Reservoir fuids?

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Homework Help Overview

The discussion revolves around calculating the pressure of a mixture of fluids in an oil reservoir, specifically at various depths and contacts within the reservoir. The subject area includes fluid mechanics and hydrostatics, focusing on pressure calculations involving water, oil, and gas columns.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate the reservoir pressure at the water-oil contact (WOC) and gas-oil contact (GOC) using the hydrostatic pressure formula. They question the appropriate height to use in the calculations for different depths, particularly whether the height should be adjusted based on the water contact level.

Discussion Status

Participants are actively seeking clarification on the calculations and the assumptions involved. Some express urgency for assistance, while others are questioning the validity of the initial calculations presented. There is no clear consensus yet on the approach or the correctness of the initial solution.

Contextual Notes

Participants are working with specific fluid densities and gravitational constants, and there may be constraints related to the homework guidelines that limit the type of assistance that can be provided.

marcoskids
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1. An oil reservoir with normal reservoir pressure at water oil contact (WOC of =12000ft) contains water, oil and gas columns of 800, 500 and 600 ft height respectively.

Calculate reservoir pressure at WOC, gas oil contact (G0C) and depths of 12500, 11700 and 11000 ft?

ρw = 1000 kg/m^3
ρo = 800 kg/m^3
ρg = 120 kg/m^3

g = 9.8 m/s^2
ft = 0.305m
Patm = 0.1 Mpa

2. P = ρgh
3.Would Pressure at WOC be : Patm + Pw + Po = 0.1x10^6 + (1000*9.8*3660m) + (800*9.8*3660m) = 64.7 Mpa

Also what would be the height to use in the P = ρgh formula for the pressure calculations at GOC,depths of 12500, 11700 and 11000 ft.
Would for example the water contact give a height of 12000 - 800 = 11200ft water column?
 
Last edited:
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Any help at all would be great :)
 
:cry:Please anyone?
 
Does my initial solution look about right?
 

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