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c8b402651d
Adapted from formulas here: https://petrowiki.spe.org/Production_forecasting_decline_curve_analysis
58 lines
2.4 KiB
C++
58 lines
2.4 KiB
C++
/////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2023 Equinor ASA
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//
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// ResInsight is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
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// for more details.
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//
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/////////////////////////////////////////////////////////////////////////////////
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#include "gtest/gtest.h"
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#include "RigDeclineCurveCalculator.h"
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// Test case from https://web.archive.org/web/20120710104333/http://infohost.nmt.edu/~petro/faculty/Kelly/Deline.pdf
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// Example Problem 8-1:
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// "Given that a well has declined from 100 stb/day to 96 stb/day during a one-month period,
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// use the exponential decline model to perform the following tasks:
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// Predict the production rate after 11 more months."
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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TEST( RigDeclineCurveCalculatorTests, computeDeclineRateExample )
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{
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double t0 = 0.0;
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double q0 = 100.0;
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double t1 = 1.0;
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double q1 = 96.0;
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double expectedDeclineRateDi = 0.04082;
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double declineRate = RigDeclineCurveCalculator::computeDeclineRate( t0, q0, t1, q1 );
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EXPECT_NEAR( expectedDeclineRateDi, declineRate, 0.005 );
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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TEST( RigDeclineCurveCalculatorTests, exponentialFlowRateExample )
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{
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double initialProductionRateQi = 96.0;
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double initialDeclineRateDi = 0.04082;
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double timeSinceStart = 11.0;
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double q = RigDeclineCurveCalculator::computeFlowRateExponentialDecline( initialProductionRateQi, initialDeclineRateDi, timeSinceStart );
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EXPECT_NEAR( q, 61.27, 0.005 );
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}
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