1	Surface Separation Chapter 13 PETE 310
2	Separator Calculations Oil and gas are recombined to determine initial reservoir composition & properties (provided oil is above p_b) Separator calculations are done to determine best operating p and T such that stock tank API is maximum… (dejavu)
3	Separator Stages
4	Separator Designs
5	3-Phase Separators Water is also separated, but will not be considered in our calculations
6	Surface Sampling
7	Bottom Hole Sampling Preserved Samples Reservoirs Conditions Selective Sampling Zones Sampling early in the life of the reservoir with minimum disturbance Lower overall cost
8	Nomenclature Used
9	Separator Calculations Six step procedure for 2 stage separators Given separator p and T, k-values, and feed composition z_i run a flash and evaluate: Using x_i1 as the feed from separator to stock tank evaluate
10	Separator Calculations Procedure for 2 stage separators (cont.) Using recently evaluated stock tank liquid compositions evaluate (Chapter 11 methods) Evaluate gas-oil ratio from steps 1,2,3 as follows:
11	Separator Calculations Procedure for 2 stage separators (cont.) Evaluate gas-oil ratio from steps 1,2,3 as follows:
12	Separator Calculations Procedure for 2 stage separators (cont.) Evaluate gas-oil ratio from steps 1,2,3 as follows:
13	Separator Calculations Procedure for 2 stage separators (cont.) Evaluate the oil density at reservoir conditions using the reservoir compositions, you get a pseudo liquid density and next (adjust for p and T, provided p < p_b) Evaluate the oil formation volume factor using quantities evaluated in stages 1, 2, 3, and 5.
14	Separator Calculations Procedure for 2 stage separators (cont.) Evaluate the oil formation volume factor using quantities evaluated in stages 1, 2, 3, and 5.
15	Separator Calculations Procedure for 2 stage separators (cont.) Evaluate the oil formation volume factor using quantities evaluated in stages 1, 2, 3, and 5.
16	Calculations Let’s discuss our excel file Separator-calculations.xls Download from webct site