Applicability of geothermal inflow performance reference curves to CO2-bearing reservoirs

Iglesias, Eduardo R.; Moya, Sara L.

doi:10.1016/s0375-6505(98)00004-2

Cited by 8 publications

(9 citation statements)

References 8 publications

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“…Numerical computation of the inflow curve of a geothermal well is useful for the estimation of the well output curve (Moya et al, 1998) and for the estimation of the formation permeability at the feedzone. The methodology (Figure 2) involves a single measurement (W,P,h) wh from which the corresponding bottomhole (W,P,h) wf values are computed employing a geothermal well simulator.…”

Section: Methodsmentioning

confidence: 99%

“…The procedure does not require field measurement of the inflow curve of the well. Instead two inflow performance dimensionless reference curves (Moya, 1994;Iglesias and Moya, 1998; Figure 1), one for mass productivity (the W*-P* dimensionless relationship) and another for thermal productivity (the W*-Pow* dimensionless relationship Pow = Wh), allow calculation of the complete inflow curve of the well from a single wellhead measurement (W,P,h) wh or a single bottomhole measurement (W,P,h) wf . When the bottomhole measured data are scarce, a geothermal well simulator can be used to generate such values from (W,P,h) wh .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation permeability at the feedzone of geothermal wells em- ploying inflow type-curves

Moya

Bahena²,

Aragón³

et al. 2001

GeofInt

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En este trabajo se hace un análisis preliminar de la aplicabilidad de las curvas GIPR (Geothermal Inflow Performance Relationships), para la estimación de permeabilidades de formaciones geotérmicas en las zonas de alimentación de los pozos. Las curvas GIPR (denominadas también curvas-tipo) son curvas características teóricas que relacionan velocidad de flujo másico producido y presión fluyente en la zona de alimentación del pozo. La metodología consiste en traslapar la curva de influjo del pozo (curva característica del pozo) con diferentes curvas tipo y el valor de permeabilidad implícito en la curva tipo del mejor traslape es el valor de permeabilidad buscado. Es importante destacar que esta metodología no requiere medir en campo la curva de influjo del pozo. El empleo de dos curvas de referencia adimensionales del comportamiento de influjo geotérmico previamente obtenidas, una para productividad másica y otra para productividad térmica, permiten el cálculo de la curva de influjo completa del pozo, desde una sola medición flujo másico-presión-entalpía específica (W-P-h) a boca o fondo de pozo, y conociendo la presión del yacimiento en la zona de alimentación del mismo (Ps). Para evaluar la aplicabilidad de la metodología propuesta se consideraron datos (W,P,h) a boca de pozo correspondientes a pruebas de descarga previas de seis pozos del campo geotérmico de Los Azufres. Las permeabilidades inferidas aplicando la metodología están en el rango establecido para este campo. Las curvas de influjo calculadas para los pozos fueron validadas comparando sus respectivas curvas de salida estimadas con los datos completos de las pruebas de descarga correspondientes. Las desviaciones encontradas son del orden del 6% para presión de cabezal y del 2% para entalpía específica, cuando la incertidumbre de los datos de campo es baja. La metodología que se propone en este trabajo puede considerarse como una herramienta complementaria a las mediciones de laboratorio en núcleos de perforación y a las pruebas de presión transitorias efectuadas en campo. Las curvas tipo de influjo incluyen los efectos de las condiciones iniciales del yacimiento, de las propiedades de la formación y el fluido y de la producción másica acumulada del pozo, para pozos con alimentación de flujo bifásico. El factor de daño en los pozos no fue considerado.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation permeability at the feedzone of geothermal wells em- ploying inflow type-curves

Moya

Bahena²,

Aragón³

et al. 2001

GeofInt

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“…The obtained results agree very good with measured data and from these, was feasible to obtain output curves. The inflow curves were validated [43] through comparison with measurements at bottom-hole conditions. Besides, the methodology also was applied for determining the permeability formation [5,44].…”

Section: Theoretical Reviewmentioning

confidence: 99%

A Review of Geothermal Type-Curves with Damage Effect: A Case of Practical Apply to a Mexican Geothermal Field

López-Blanco¹,

Aragón-Aguilar²,

Arellano-Gómez³

et al. 2012

IJG

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A review of the art state was developed about the inflow relationships and their application for reservoir characterization. The theoretical development of the methodology for determining the damage effect using type-curves of the inflow relationships was shown. We show the process followed for achieve the geothermal type-curve affected with damage for reservoirs with mean salinities of 30000 ppm and temperatures up to 350℃. This type-curve was applied using measurement production data in a Mexican geothermal field. According with the obtained results is shown that the methodology for determining the damage effect using production measurements is a sure alternative for the damage effect calculation. It was used an alternative methodology in order to validate the damage presence and the obtained results were consistent. Last thing shows that both methodologies can be combined as a confident manner

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“…The most representative ternary mixture of a geothermal fluid is H 2 O-NaCl-CO 2 (Battistelli et al, 1997). CO 2 represents the effect of the non-condensable gases (Battistelli et al, 1993;Iglesias and Moya, 1998;Pruess and Garcia, 202;Lu et al, 2006) whereas the term used in THOUGH2 as NaCl represents that of total salts of reservoir fluid (Pritchett, 1993;Battistelli et al, 1997). The concentration of salts in the geothermal reservoirs is variable.…”

Section: Introductionmentioning

confidence: 99%

“…In a later study, Moya (1994) incorporated the effect of non-condensable gases developing a solubility model for the binary mixture H 2 O-CO 2 (Moya and Iglesias, 1992;Iglesias and Moya, 1992). The applicability of these typecurves for the estimation of the productivity of geothermal wells was discussed by Moya et al (1998) and Iglesias and Moya (1998). This methodology to estimate the productivity of geothermal wells was automated (Moya and Uribe, 2000) and later complemented with the estimation of the permeability of the rock formation adjacent to the well (Moya et al, 2001;2003).…”

Section: Introductionmentioning

confidence: 99%

The effect of salinity and gas saturation of a geothermal fluid on the reservoir permeability reduction

Flores

Meza

Sara

et al. 2017

GeofInt

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Highly saline geothermal reservoirs show problems of salt precipitation on the rock formation reducing its permeability and the well’s productivity. In this study, theoretical curves of mass productivity of geothermal wells (inflow type curves) were obtained considering ternary mixtures of H2O-CO2-NaCl of up to 25% salinity in weight and under different initial conditions of gas saturation of the fluid. The sensitivity analysis to the initial concentration of salts and initial gas saturation was carried out using the simulator TOUGH2. The developed type curves are focused to reservoirs with criti-cal characteristics such as, low permeability, ranges of high salt precipitation and high gas saturation. The obtained curves show three clearly defined zones as a function of the degree of exploitation of the well: no salt precipitation zones; transition zones; and salt precipitation zones. It was found that salt precipitation in the reservoir occurs in greater intensity at higher initial concentrations of dissolved salts and higher gas saturation. In some cases, scale obstructs the pores of the rock formation drastically reducing its permeability. It is proposed that type curves could be used as complementary tools for the analysis of wells and for the selection of pertinent strategies for the exploitation of geothermal fields.

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Applicability of geothermal inflow performance reference curves to CO2-bearing reservoirs

Cited by 8 publications

References 8 publications

Formation permeability at the feedzone of geothermal wells em- ploying inflow type-curves

Formation permeability at the feedzone of geothermal wells em- ploying inflow type-curves

A Review of Geothermal Type-Curves with Damage Effect: A Case of Practical Apply to a Mexican Geothermal Field

The effect of salinity and gas saturation of a geothermal fluid on the reservoir permeability reduction

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