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Well testing of gas lift wells

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Assign a maximum ALQ value to each GLIFT producer when doing well testing
in beginTimeStep(). This allows the well to be considered open. Then,
later in the timestep, when assemble() is called, the full gas lift
optimization procedure can adjust the ALQ to its correct value.

It is also observed that in some cases when gas lift is switched off by
setting ALQ to zero, and later in the schedule is switched back on again,
it might not be possible to determine bhp from thp for low small ALQ values.
Instead of aborting the gas lift optimization, we should try increasing
ALQ until we get convergence or until the maximum ALQ for the well is
reached.
This commit is contained in:
Håkon Hægland
2022-03-27 07:57:31 +02:00
parent ec9be88736
commit 11907495c1
4 changed files with 88 additions and 15 deletions
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5
opm/simulators/wells/GasLiftSingleWellGeneric.hpp
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@@ -250,7 +250,8 @@ protected:
bool checkInitialALQmodified_(double alq, double initial_alq) const;
bool checkThpControl_() const;
virtual std::optional<double> computeBhpAtThpLimit_(double alq) const = 0;
std::optional<BasicRates> computeInitialWellRates_() const;
std::pair<std::optional<double>,double> computeConvergedBhpAtThpLimitByMaybeIncreasingALQ_() const;
std::pair<std::optional<BasicRates>,double> computeInitialWellRates_() const;
std::optional<LimitedRates> computeLimitedWellRatesWithALQ_(double alq) const;
virtual BasicRates computeWellRates_(double bhp, bool bhp_is_limited, bool debug_output = true) const = 0;
std::optional<BasicRates> computeWellRatesWithALQ_(double alq) const;
@@ -272,7 +273,7 @@ protected:
const BasicRates& rates) const;
std::pair<double, bool> getGasRateWithGroupLimit_(
double new_gas_rate, double gas_rate) const;
std::optional<LimitedRates> getInitialRatesWithLimit_() const;
std::pair<std::optional<LimitedRates>,double> getInitialRatesWithLimit_() const;
LimitedRates getLimitedRatesFromRates_(const BasicRates& rates) const;
std::tuple<double,double,bool,bool> getLiquidRateWithGroupLimit_(
const double new_oil_rate, const double oil_rate,