The following recommendations can be considered for future study;
The input to the optimization model should be refined as more information becomes available.
Data required include fixed costs and variable costs for all the nodes, demand parameters at each destination nodes since these parameters strongly affect the optimal decision from the gas utilization.
More realistic stochastic variations should be carried out on the fixed, variable and market price of natural gas at each node. This would call for stochastic programming to solve the equations from the optimization model.
Other gas utilization projects (both current and planned) like the Escravos Gas and GTL projects, Delta State gas utilization project, etc should be investigated by carrying out judicious modifications to this model.
Model can be employed to evaluate options for gas utilization in a single field whereby a decision can be taken on how to optimize the profit from that field.
Further studies should incorporate several source nodes to emphasize the presence of several producing wells.
73
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NOMENCLATURE
Xoa amount of gas or by-product transported from the source node „0‟ to process node „a‟ in Tscf Xob amount of gas or by-product transported from the source node „0‟ to process node „b‟ in Tscf Xoc amount of gas or by-product transported from the source node „0‟ to process node „c‟ in Tscf Xad amount of gas or by-product transported from node „a‟ to process node „d‟ in Tscf
Xae amount of gas or by-product transported from node „a‟ to process node „e‟ in Tscf Xd1 amount of gas or by-product transported from node „d‟ to market node „1‟ in Tscf Xd2 amount of gas or by-product transported from node „d‟ to market node „2‟ in Tscf Xd3 amount of gas or by-product transported from node „d‟ to market node „3‟ in Tscf Xe4 amount of gas or by-product transported from node „e‟ to market node „4‟ in Tscf Xe5 amount of gas or by-product transported from node „e‟ to market node „5‟ in Tscf Xb6 amount of gas or by-product transported from node „b‟ to market node „6‟ in Tscf Xb7 amount of gas or by-product transported from node „b‟ to market node „7‟ in Tscf Xb8 amount of gas or by-product transported from node „b‟ to market node „8‟ in Tscf Xb9 amount of gas or by-product transported from node „b‟ to market node „9‟ in Tscf Xc10 amount of gas or by-product transported from node „c‟ to market node „10‟ in Tscf yoa coefficient switch to determine whether a fixed cost should be applied at node „a‟
yob coefficient switch to determine whether a fixed cost should be applied at node „b‟
yoc coefficient switch to determine whether a fixed cost should be applied at node „c‟
yad coefficient switch to determine whether a fixed cost should be applied at node „d‟
yae coefficient switch to determine whether a fixed cost should be applied at node „e‟
yd1 coefficient switch to determine whether a fixed cost should be applied at node „1‟
yd2 coefficient switch to determine whether a fixed cost should be applied at node „2‟
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yd3 coefficient switch to determine whether a fixed cost should be applied at node „3‟
ye4 coefficient switch to determine whether a fixed cost should be applied at node „4‟
ye5 coefficient switch to determine whether a fixed cost should be applied at node „5‟
yb6 coefficient switch to determine whether a fixed cost should be applied at node „6‟
yb7 coefficient switch to determine whether a fixed cost should be applied at node „7‟
yb8 coefficient switch to determine whether a fixed cost should be applied at node „8‟
yb9 coefficient switch to determine whether a fixed cost should be applied at node „9‟
yc10 coefficient switch to determine whether a fixed cost should be applied at node „10‟
BOPD barrel of oil per day BS Base case Study
Bscf Billion standard cubic feet per day CNG Compressed Natural Gas
EIA Energy Information and Administration EOR Enhanced Oil Recovery
G Total gas volumes at the source in Tscf GHG Green House Gases
GTL Gas to liquid
IOCs International Oil Companies
LINDO Linear Interactive Discreet Optimizer LNG Liquefied Natural Gas
LPG Liquefied Petroleum Gas
M a significantly large volume of gas used to calculate the switching coefficient y.
MMBTU Million British thermal unit MMscf/d Million standard cubic feet per day
80 NGL Natural Gas Liquid
NGMP Nigerian Gas Master Plan OML Oil Mining Lease
OPEC Organization of petroleum Exporting Countries OPL Oil Prospecting License
Q Deliverability at the destination nodes, MMscf/d Tscf Trillion standard cubic feet per day
TSGP: Transsaharan Gas Pipeline Project WAGP: West African Gas Pipeline Project
Y mole fraction of gas or by-product at the destination node
Subscript
0 index for source node
a, b, c, d, e indices for process nodes i, j and k nodal indices
t index for terminal nodes, “1” through “9”
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