scholarly journals A new method of damage determination in geothermal wells from geothermal inflow with application to Los Humeros, Mexico

2008 ◽  
Vol 47 (4) ◽  
pp. 371-382
Author(s):  
A. Aragón ◽  
S. L. Moya ◽  
A. García Gutiérrez ◽  
V. Arellano
Keyword(s):  
Reservoir Characterization ◽  
Geothermal Field ◽  
Damage Effect ◽  
Transient Pressure ◽  
Type Curves ◽  
Pressure Tests ◽  
Geothermal Wells ◽  
Productivity Indices ◽  
Well Damage ◽  
Inflow Performance

Geothermal inflow type curves were obtained for different values of well damage (i.e., inflow performance relationships). The method was evaluated by diagnosing the damage of thirteen producing wells in the Los Hu- meros, Puebla, Me?xico geothermal field. Permeability determinations were carried out for these wells and their productivity indices were estimated. Comparison of the diagnoses made via damage effects against the results of field pressure tests showed that the maximum difference between both approaches is on the order of 0.7 damage units. The methodology allows reservoir characterization along its productive life, since several production tests are carried out while the reservoir is producing. The data obtained from production tests are used to determine the damage effect and permeability of the rock formation. Previously the damage (skin factor) could only be determined from the analyses of transient pressure tests.

scholarly journals Characterization Methodology for Analysis in Neighboring Productive and Nonproductive Zones of Los Humeros Geothermal Field

2020 ◽  
pp. 114-129
Author(s):  
Alfonso Aragon-Aguilar ◽  
Abel Hernandez-Ochoa ◽  
Alejandro Arriola-Medellin
Keyword(s):  
High Temperatures ◽  
Geothermal Field ◽  
Geothermal Reservoir ◽  
Reservoir Engineering ◽  
Low Permeability ◽  
Temperature Profiles ◽  
Fluid Circulation ◽  
Transient Pressure ◽  
Eastern Zone ◽  
Pressure Tests

The study focused on the analysis of two neighboring zones in the Los Humeros geothermal field (LHGF), each one with different characteristic behaviors. A characterization methodology which can be used in geothermal reservoir engineering was designed and applied to study the zones. The static temperature profiles determined in wells located at the studied zone of the field ranged between 300°C and 360°C. From these temperatures, isotherms in the studied area were calculated and these trend to be deeper toward eastern zone of the field. Similarly the thicknesses tend to reduce in this direction. By analyzing the profiles of fluid circulation losses were determined during drilling of wells in this zone, the existence of low permeability in the rock formation was inferred. From the results of transient pressure tests, low permeability was confirmed. A marked difference in the productive characteristics between the wells, in the close neighborhood was also observed.  Behavior of wells also shows tendency to increase in their steam fractions, with the exploitation time. The characterization methodology applied to the studied zones, allows identify that there is a reservoir section with low permeability, but with high temperatures the depth increases.

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

2012 ◽  
Vol 03 (03) ◽  
pp. 591-600 ◽  
Author(s):  
Siomara López-Blanco ◽  
Alfonso Aragón-Aguilar ◽  
Víctor Arellano-Gómez ◽  
Georgina Izquierdo-Montalvo ◽  
Sócrates Santoyo-Gutiérrez ◽  
...  
Keyword(s):  
Geothermal Field ◽  
Damage Effect ◽  
Type Curves

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

2001 ◽  
Vol 40 (3) ◽  
pp. 163-180
Author(s):  
Sara L. Moya ◽  
Daniel Uribe ◽  
Alfonso Aragón ◽  
Alfonso García
Keyword(s):  
Type Curves ◽  
Geothermal Wells ◽  
Inflow Performance

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.

scholarly journals New Understanding of Transient Pressure Response in the Transition Zone of Oil-Water and Gas-Water Systems

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Wenbin Xu ◽  
Zhihui Liu ◽  
Jie Liu ◽  
Yongfei Yang
Keyword(s):  
Transition Zone ◽  
Outer Boundary ◽  
Water System ◽  
Pressure Response ◽  
Transient Pressure ◽  
Type Curves ◽  
Boundary Type ◽  
Study Results ◽  
Effective Mobility ◽  
Oil Water

Well test analysis requires a preselected model, which relies on the context input and the diagnostic result through the pressure logarithmic derivative curve. Transient pressure outer boundary response heavily impacts on the selection of such a model. Traditional boundary-type curves used for such diagnostic purpose are only suitable for single-phase flow in a homogeneous reservoir, while practical situations are often much more complicated. This is particularly true when transient pressure is derived during the field development phase, for example, from permanent down-hole gauge (PDG), where outer boundary condition such as an active aquifer with a transition zone above it plays a big role in dominating the late time pressure response. In this case, capillary pressure and the total mobility in the transition zone have significant effect on the pressure response. This effect is distinctly different for oil-water system and gas water system, which will result in the pressure logarithmic derivatives remarkably different from the traditional boundary-type curves. This paper presents study results derived through theoretical and numerical well testing approaches to solve this problem. The outcome of this study can help in understanding the reservoir behavior and guiding the management of mature field. According to the theoretical development by Thompson, a new approach was derived according to Darcy’s law, which shows that pressure response in the transition zone is a function of total effective mobility. For oil-water system, the total effective mobility increases with an increase in the radius of transition zone, while for gas-water system, the effect is opposite.

scholarly journals Methodology Applied for Thickness Selection and Stored Heat Evaluation in Non-producer Geothermal Wells in Order to Its Investment Rescue

2020 ◽  
pp. 91-111
Author(s):  
Alfonso Aragon- Aguilar ◽  
Georgina Izquierdo- Montalvo ◽  
Dominic A. Becerra- Serrato ◽  
Victor M. Monrroy- Mar
Keyword(s):  
Electric Energy ◽  
Geothermal Field ◽  
Geothermal Systems ◽  
Drainage Radius ◽  
Heterogeneous Behavior ◽  
Water Recharge ◽  
Geothermal Wells ◽  
Using Data ◽  
Heat Calculation ◽  
Heat Store

An assessment methodology of stored heat in rock formation surrounding to wellbore in geothermal systems is shown. Due to geothermal systems generally are nested in volcanic rock, it is characteristic its heterogeneous behavior. Proposed methodology starts since zone selection with possibilities of heat store. This methodology is focused to be applied in geothermal reservoirs with tendency to production decline, due to low permeability and unbalance between exploitation and water recharge. Because the high costs of drilling geothermal wells, methodology shown in this work is proposed to be applied in those with production decline or non-producers, in order to rescue its investment. The objective is to select the thickness with heat, evaluate its storage, design the appropriate instrumentation for its recovery, its energy conversion and rescue its investment done. The different designs for energy recovery using non-conventional methods to those, used habitually are reviewed. Each one of the variables for stored heat calculation was determined using technical tools of reservoir engineering. A parametric analysis about variables sensitivity (porosity and drainage radius) for determining thermal energy and corresponding electric energy of analyzed rock volume is done. Practical application of this methodology was carried out using data of one of wells of Los Humeros Mexican geothermal field.

Welltest analysis of hydraulically fractured tight gas reservoirs: a field example from Perth Basin, Western Australia

2012 ◽  
Vol 52 (1) ◽  
pp. 587 ◽  
Author(s):  
Hassan Bahrami ◽  
Vineeth Jayan ◽  
Reza Rezaee ◽  
Dr Mofazzal Hossain
Keyword(s):  
Radial Flow ◽  
Second Derivative ◽  
Tight Gas ◽  
Transient Pressure ◽  
Gas Reservoirs ◽  
Type Curves ◽  
Tight Gas Reservoirs ◽  
Diagnostic Plots ◽  
Reservoir Permeability ◽  
Reservoir Flow

Welltest interpretation requires the diagnosis of reservoir flow regimes to determine basic reservoir characteristics. In hydraulically fractured tight gas reservoirs, the reservoir flow regimes may not clearly be revealed on diagnostic plots of transient pressure and its derivative due to extensive wellbore storage effect, fracture characteristics, heterogeneity, and complexity of reservoir. Thus, the use of conventional welltest analysis in interpreting the limited acquired data may fail to provide reliable results, causing erroneous outcomes. To overcome such issues, the second derivative of transient pressure may help eliminate a number of uncertainties associated with welltest analysis and provide a better estimate of the reservoir dynamic parameters. This paper describes a new approach regarding welltest interpretation for hydraulically fractured tight gas reservoirs—using the second derivative of transient pressure. Reservoir simulations are run for several cases of non-fractured and hydraulically fractured wells to generate different type curves of pressure second derivative, and for use in welltest analysis. A field example from a Western Australian hydraulically fractured tight gas welltest analysis is shown, in which the radial flow regime could not be identified using standard pressure build-up diagnostic plots; therefore, it was not possible to have a reliable estimate of reservoir permeability. The proposed second derivative of pressure approach was used to predict the radial flow regime trend based on the generated type curves by reservoir simulation, to estimate the reservoir permeability and skin factor. Using this analysis approach, the permeability derived from the welltest was in good agreement with the average core permeability in the well, thus confirming the methodology’s reliability.

scholarly journals Surface and Groundwater Hydrochemistry of the Menengai Caldera Geothermal Field and Surrounding Nakuru County, Kenya

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3131 ◽  
Author(s):  
Nelly Montcoudiol ◽  
Neil M. Burnside ◽  
Domokos Györe ◽  
Nicholas Mariita ◽  
Thecla Mutia ◽  
...  
Keyword(s):  
Ionic Composition ◽  
Sampling Period ◽  
Geothermal Field ◽  
Wet Season ◽  
Lake Nakuru ◽  
Rock Interaction ◽  
Geothermal Wells ◽  
Groundwater Hydrochemistry ◽  
Hydrological System ◽  
Oxygen Isotopic

In order to assess the sustainability and impact of production from geothermal reservoirs on hydrological systems, a thorough understanding of local and regional hydrogeological systematics is a prerequisite. The Menengai Caldera in the Kenya Great Rift Valley is one of the largest explored geothermal fields in the country. This paper presents a hydrochemical investigation of the Menengai Caldera geothermal field and the ground and surface waters of the surrounding Nakuru County. Our results demonstrated a similar, sodium-alkaline dominated, ionic composition across all water types. Geothermal wells return the highest cation/anion concentrations and largely demonstrate a meteoric source from their δ18O and δ2H signature. Wells MW-09 (central part of the caldera), MW-18 (eastern part) and MW-20 (central part) showed a more evaporitic signature, closely matching with our own calculated Lake Evaporation Line, suggesting an increased mixing influence of Lake Nakuru waters. MW-09 also showed evidence of high-temperature oxygen isotopic exchange and significant water-rock interaction. Lake samples largely demonstrated seasonal shifts in ionic and isotopic values. Lake Nakuru ionic composition and isotopic values increased throughout the 12-month wet–dry–wet season sampling period. This correlated with a decrease in area which suggests a lessening of water inflow and facilitates increased evaporation. Groundwaters demonstrated clear evidence of mixing between meteoric, irrigation and lake waters. These observations enhanced the understanding of the hydrological system surrounding the Menengai Caldera and, when combined with future studies, will provide a powerful tool to assess the sustainability and impact of soon-to-be completed geothermal power production operations.

scholarly journals Groundwater Chemistry and Overpressure Evidences in Cerro Prieto Geothermal Field

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Ivan Morales-Arredondo ◽  
María Aurora Armienta ◽  
Nuria Segovia
Keyword(s):  
Water Samples ◽  
Evolutionary Process ◽  
Geothermal Field ◽  
Geological Characteristics ◽  
Physical Chemical ◽  
Geothermal Wells ◽  
Cerro Prieto ◽  
Diagenetic Evolution ◽  
Brine Evolution

In order to understand the geological and hydrogeological processes influencing the hydrogeochemical behavior of the Cerro Prieto Geothermal Field (CP) aquifer, Mexico, a characterization of the water samples collected from geothermal wells was carried out. Different hydrochemical diagrams were used to evaluate brine evolution of the aquifer. To determine pressure conditions at depth, a calculation was performed using hydrostatic and lithostatic properties from CP, considering geological characteristics of the study area, and theoretical information about some basin environments. Groundwater shows hydrogeochemical and geological evidences of the diagenetic evolution that indicate overpressure conditions. Some physical, chemical, textural, and mineralogical properties reported in the lithological column from CP are explained understanding the evolutionary process of the sedimentary material that composes the aquifer.

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