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add ejt as estimate paramater #5

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add ejt as estimate paramater #5

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1bc1a90
add ejt as estimate paramater
goncalvesmachadoc Aug 31, 2021
7ad6077
add ejt to modelparam
goncalvesmachadoc Aug 31, 2021
2cad172
effect to coefficient
goncalvesmachadoc Aug 31, 2021
467eb39
fix ejt
goncalvesmachadoc Aug 31, 2021
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6 changes: 3 additions & 3 deletions src/captas.c
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
/*

Computer Aided Pressure Transient Analysis (and Simulation?) � CAPTA(S?)
Computer Aided Pressure Transient Analysis (and Simulation?) � CAPTA(S?)
Copyright (C) 2013 Carlos E. Pico

This program is free software: you can redistribute it and/or modify
Expand Down Expand Up @@ -534,7 +534,8 @@ void init_parameters(modelparameters *par)
par->parnames[PENETRATION_RATIO] = "b";
par->parnames[MIDPOINT_ELEVATION] = "zw",
par->parnames[EFFECTIVE_HEAT_CAPACITY] = "cpt",
par->parnames[INITIAL_TEMPERATURE] = "Ti";
par->parnames[INITIAL_TEMPERATURE] = "Ti",
par->parnames[JOULE_THOMSON_COEFFICIENT] = "ejt";

/******************** pointers to delta_pwf functions ********************/
for(i = 0; i < NPMODELS; i++){
Expand Down Expand Up @@ -683,7 +684,6 @@ void read_inifile(modelparameters *par)
par->h = iniparser_getdouble(ini, "Test description:h", 0.0);
par->rw = iniparser_getdouble(ini, "Test description:rw", 0.0);
par->ct = iniparser_getdouble(ini, "Test description:ct", 0.0);
par->ejt = iniparser_getdouble(ini, "Test description:ejt", 0.0);
par->rhosc = iniparser_getdouble(ini, "Test description:rhosc", 0.0);
par->cp = iniparser_getdouble(ini, "Test description:cp", 0.0);

Expand Down
9 changes: 5 additions & 4 deletions src/models/dTwf.c
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Expand Up @@ -16,7 +16,7 @@
* Transient temperature behavior and analysis of single-phase liquid-water
* geothermal reservoirs during drawdown and buildup tests: Part I.
* Theory, new analytical and approximate solutions.
* Journal of Petroleum Science and Engineering, 146, 637�656.
* Journal of Petroleum Science and Engineering, 146, 637�656.
* https://doi.org/10.1016/j.petrol.2016.08.003
*/

Expand All @@ -28,21 +28,22 @@
double dTwf(const modelparameters *p, double t)
{
double a, b, cpR, f, d;
double k, S, cpt;
double k, S, cpt, ejt;

gsl_set_error_handler_off();

k = p->rpval[PERMEABILITY];
S = p->rpval[SKIN_FACTOR];
cpt = p->rpval[EFFECTIVE_HEAT_CAPACITY];
ejt = p->rpval[JOULE_THOMSON_COEFFICIENT];

a = (p->C2 * p->qB * p->mu) / (k * p->h);
b = (p->rw * p->rw * p->phi * p->ct * p->mu ) / (4.0 * k * p->C1);
cpR = (p->rhosc / p->B) * p->cp / cpt;
f = p->phi * cpR * (p->ejt + 1.0 / (p->rhosc * p->cp / p->B)) - p->ejt;
f = p->phi * cpR * (ejt + 1.0 / (p->rhosc * p->cp / p->B)) - ejt;
d = (p->phi * cpR * p->ct) * a * 0.5;

return -0.5*a*( -p->ejt*(gsl_sf_expint_E1(b/t) + 2.0*S) - f*gsl_sf_expint_E1(b/t + d) );
return -0.5*a*( -ejt*(gsl_sf_expint_E1(b/t) + 2.0*S) - f*gsl_sf_expint_E1(b/t + d) );

}
/*****************************************************************************/
Expand Down
2 changes: 1 addition & 1 deletion src/models/modelparam.h
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Expand Up @@ -30,6 +30,7 @@
#define MIDPOINT_ELEVATION 18
#define EFFECTIVE_HEAT_CAPACITY 19
#define INITIAL_TEMPERATURE 20
#define JOULE_THOMSON_COEFFICIENT 21

typedef struct
{
Expand Down Expand Up @@ -62,7 +63,6 @@ typedef struct
ct, // total compressibility
rw, // wellbore radius
h, // formation thickness
ejt, // joule-thomson coefficient
rhosc, // density at standard conditions
cp; // specific heat capacity

Expand Down