mirror of
https://github.com/OPM/ResInsight.git
synced 2025-01-01 03:37:15 -06:00
c8b402651d
Adapted from formulas here: https://petrowiki.spe.org/Production_forecasting_decline_curve_analysis
98 lines
5.5 KiB
C++
98 lines
5.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Copyright (C) 2023- Equinor ASA
|
|
//
|
|
// ResInsight is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
// FITNESS FOR A PARTICULAR PURPOSE.
|
|
//
|
|
// See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
|
|
// for more details.
|
|
//
|
|
/////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "RigDeclineCurveCalculator.h"
|
|
|
|
#include <cmath>
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
///
|
|
//--------------------------------------------------------------------------------------------------
|
|
double RigDeclineCurveCalculator::computeDeclineRate( double time0, double value0, double time1, double value1 )
|
|
{
|
|
return ( 1.0 / ( time1 - time0 ) ) * std::log( value0 / value1 );
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
///
|
|
//--------------------------------------------------------------------------------------------------
|
|
double RigDeclineCurveCalculator::computeFlowRateExponentialDecline( double initialProductionRateQi,
|
|
double initialDeclineRateDi,
|
|
double timeSinceStart )
|
|
{
|
|
return initialProductionRateQi * std::exp( -initialDeclineRateDi * timeSinceStart );
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
///
|
|
//--------------------------------------------------------------------------------------------------
|
|
double RigDeclineCurveCalculator::computeFlowRateHarmonicDecline( double initialProductionRateQi, double initialDeclineRateDi, double timeSinceStart )
|
|
{
|
|
return initialProductionRateQi / ( 1.0 + initialDeclineRateDi * timeSinceStart );
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
///
|
|
//--------------------------------------------------------------------------------------------------
|
|
double RigDeclineCurveCalculator::computeFlowRateHyperbolicDecline( double initialProductionRateQi,
|
|
double initialDeclineRateDi,
|
|
double timeSinceStart,
|
|
double hyperbolicDeclineConstantB )
|
|
{
|
|
return initialProductionRateQi /
|
|
std::pow( 1.0 + hyperbolicDeclineConstantB * initialDeclineRateDi * timeSinceStart, 1.0 / hyperbolicDeclineConstantB );
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
///
|
|
//--------------------------------------------------------------------------------------------------
|
|
double RigDeclineCurveCalculator::computeCumulativeProductionExponentialDecline( double initialProductionRateQi,
|
|
double initialDeclineRateDi,
|
|
double timeSinceStart )
|
|
{
|
|
double productionRate = computeFlowRateExponentialDecline( initialProductionRateQi, initialDeclineRateDi, timeSinceStart );
|
|
return ( 1 / initialDeclineRateDi ) * ( initialProductionRateQi - productionRate );
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
///
|
|
//--------------------------------------------------------------------------------------------------
|
|
double RigDeclineCurveCalculator::computeCumulativeProductionHarmonicDecline( double initialProductionRateQi,
|
|
double initialDeclineRateDi,
|
|
double timeSinceStart )
|
|
{
|
|
double productionRate = computeFlowRateHarmonicDecline( initialProductionRateQi, initialDeclineRateDi, timeSinceStart );
|
|
return ( initialProductionRateQi / initialDeclineRateDi ) * std::log( initialProductionRateQi / productionRate );
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
///
|
|
//--------------------------------------------------------------------------------------------------
|
|
double RigDeclineCurveCalculator::computeCumulativeProductionHyperbolicDecline( double initialProductionRateQi,
|
|
double initialDeclineRateDi,
|
|
double timeSinceStart,
|
|
double hyperbolicDeclineConstantB )
|
|
{
|
|
double productionRate =
|
|
computeFlowRateHyperbolicDecline( initialProductionRateQi, initialDeclineRateDi, timeSinceStart, hyperbolicDeclineConstantB );
|
|
|
|
return ( std::pow( initialProductionRateQi, hyperbolicDeclineConstantB ) / ( ( 1.0 - hyperbolicDeclineConstantB ) * initialDeclineRateDi ) ) *
|
|
( std::pow( initialProductionRateQi, 1.0 - hyperbolicDeclineConstantB ) -
|
|
std::pow( productionRate, 1.0 - hyperbolicDeclineConstantB ) );
|
|
}
|