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#11172: Add auto Arps decline curve type

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Add auto Arps decline curve fitting, document the algorithm and reference the AutoDCA repository.
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Magne Sjaastad committed 2026-10-13 12:44:00 +02:00
1 parent 393d32578e
commit c6927648e8
4 files changed
+279 -8
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ApplicationLibCode/UnitTests/RigDeclineCurveCalculator-Test.cpp
+40
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@@ -123,4 +123,44 @@ TEST( RigDeclineCurveCalculatorTests, historyIsBackwardExtrapolationOfFittedCurv
EXPECT_NE( values[0], ( *result )[0] );
EXPECT_GT( ( *result )[0], ( *result )[1] );
EXPECT_GT( ( *result )[3], ( *result )[4] );
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
TEST( RigDeclineCurveCalculatorTests, autoArpsRecoversHyperbolicParametersAndSkipsRampUp )
{
const double year = RigDeclineCurveCalculator::secondsPerYear;
const double qi = 100.0;
const double di = 0.6 / year;
const double b = 0.5;
std::vector<double> times;
std::vector<double> rates;
// Ramp-up before the peak rate must be ignored
for ( int i = -30; i <= -25; i++ )
{
times.push_back( i * 0.1 * year );
rates.push_back( 10.0 + ( i + 30 ) * 10.0 );
}
for ( int i = -24; i <= 0; i++ )
{
const double t = i * 0.1 * year;
times.push_back( t );
rates.push_back( RigDeclineCurveCalculator::computeFlowRateHyperbolicDecline( qi, di, t, b ) );
}
auto fit = RigDeclineCurveCalculator::fitAutoArps( times, rates );
ASSERT_TRUE( fit.has_value() );
EXPECT_NEAR( qi, fit->initialProductionRate, 0.5 );
EXPECT_NEAR( b, fit->hyperbolicDeclineConstantB, 0.05 );
EXPECT_NEAR( di * year, fit->initialDeclineRate * year, 0.05 );
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
TEST( RigDeclineCurveCalculatorTests, autoArpsFailsWithTooFewPoints )
{
EXPECT_FALSE( RigDeclineCurveCalculator::fitAutoArps( { -10.0, 0.0 }, { 5.0, 4.0 } ).has_value() );
}