The general form of objective function for production targets optimisation is given by:
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where
and
years | assessment period | days | running time in the form of the number of days past the start of production | years | number of years past the start of production by the current moment | |||
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– | discount rate | |||||||
volume/day | oil production rate for -th producer | cash/volume | cash/volume | oil selling price | ||||
volume/day | gas production rate for -th producer | cash/volume | cash/volume | gas selling price | ||||
volume/day | water production rate for -th producer | cash/volume | counts | number of producers at | ||||
volume/day | liquid production rate for -th producer | cash/volume | cost of fluid lift from reservoir to the -th wellhead, cash/volume | |||||
volume/day | water supply/disposal rate | cash/volume | cost of water supply | cash/volume | cost of water disposal | |||
volume/day | gas supply/disposal rate | cash/volume | cost of gas supply | cash/volume | cost of gas disposal | |||
volume/day | water injection rate for -th water injector | cash/volume | cost of water injection, including treatment, transportation and pumping into -th well | counts | number of water injectors at | |||
volume/day | gas injection rate for -th gas injector | cash/volume | cost of gas injection, including purchase, treatment, transportation and pumping into -th well | number of gas injectors at |
The objective function can be rewritten in terms of Surface flowrates :
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where
Watercut in -th well | |
Gas-Oil Ratio in -th well |
The objective function can be further rewritten in terms of Sandface flowrates :
where
Depending on Lift mechanism the rates in equation may be set directly or calculated from THP and formation pressure (which is a usual case in injection wells):
Producing wells may spontaneously vary between Constant rate production: qL = const and Constant pressure production: pwf = const (see Constant rate production: qL = const for alternation details). |
Petroleum Industry / Upstream / Production / Field Development Plan
Subsurface Production / Well & Reservoir Management / [ Production Targets ]
Subsurface E&P Disciplines / Production Technology
[ Constant rate production: qL = const ] [ Constant pressure production: pwf = const ]