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

2017 ◽  
Vol 56 (4) ◽  
Author(s):  
Juán Flores ◽  
Onésimo Meza ◽  
Sara L. ◽  
Alfonso Aragón
Keyword(s):  
Initial Conditions ◽  
Ternary Mixtures ◽  
Salt Precipitation ◽  
Type Curves ◽  
Transition Zones ◽  
Rock Formation ◽  
Gas Saturation ◽  
Reservoir Permeability ◽  
Geothermal Fields ◽  
Geothermal Wells

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.

Mahakam Field Characterization Using Production Type-Curve With Business Intelligence Application

2020 ◽  
Author(s):  
P. Noverri
Keyword(s):  
Business Intelligence ◽  
Data Gathering ◽  
Production Data ◽  
Type Curve ◽  
Type Curves ◽  
Production Type ◽  
Efficient Data ◽  
Production Behavior ◽  
Factor Type ◽  
Mahakam Delta

Delta Mahakam is a giant hydrocarbon block which is comprised two oil fields and five gas fields. The giant block has been considered mature after production for more than 40 years. More than 2,000 wells have been drilled to optimize hydrocarbon recovery. From those wells, a huge amount of production data is available and documented in a well-structured manner. Gaining insight from this data is highly beneficial to understand fields behavior and their characteristics. The fields production characterization is analyzed with Production Type-Curve method. In this case, type curves were generated from production data ratio such as CGR, WGR and GOR to field recovery factor. Type curve is considered as a simple approach to find patterns and capture a helicopter view from a huge volume of production data. Utilization of business intelligence enables efficient data gathering from different data sources, data preparation and data visualization through dashboards. Each dashboard provides a different perspective which consists of field view, zone view, sector view and POD view. Dashboards allow users to perform comprehensive analysis in describing production behavior. Production type-curve analysis through dashboards show that fields in the Mahakam Delta can be grouped based on their production behavior and effectively provide global field understanding Discovery of production key information from proposed methods can be used as reference for prospective and existing fields development in the Mahakam Delta. This paper demonstrates an example of production type-curve as a simple yet efficient method in characterizing field production behaviors which is realized by a Business Intelligent application

scholarly journals Incremental and acceleration production estimation and their effect on optimization of well infill locations in tight gas reservoirs

2021 ◽  
Author(s):  
Atheer Dheyauldeen ◽  
Omar Al-Fatlawi ◽  
Md Mofazzal Hossain
Keyword(s):  
Transient Flow ◽  
Development Planning ◽  
Main Role ◽  
Gas Reservoirs ◽  
Type Curves ◽  
Field Development ◽  
Drilling Performance ◽  
Well Location ◽  
Infill Drilling ◽  
Tight Formations

AbstractThe main role of infill drilling is either adding incremental reserves to the already existing one by intersecting newly undrained (virgin) regions or accelerating the production from currently depleted areas. Accelerating reserves from increasing drainage in tight formations can be beneficial considering the time value of money and the cost of additional wells. However, the maximum benefit can be realized when infill wells produce mostly incremental recoveries (recoveries from virgin formations). Therefore, the prediction of incremental and accelerated recovery is crucial in field development planning as it helps in the optimization of infill wells with the assurance of long-term economic sustainability of the project. Several approaches are presented in literatures to determine incremental and acceleration recovery and areas for infill drilling. However, the majority of these methods require huge and expensive data; and very time-consuming simulation studies. In this study, two qualitative techniques are proposed for the estimation of incremental and accelerated recovery based upon readily available production data. In the first technique, acceleration and incremental recovery, and thus infill drilling, are predicted from the trend of the cumulative production (Gp) versus square root time function. This approach is more applicable for tight formations considering the long period of transient linear flow. The second technique is based on multi-well Blasingame type curves analysis. This technique appears to best be applied when the production of parent wells reaches the boundary dominated flow (BDF) region before the production start of the successive infill wells. These techniques are important in field development planning as the flow regimes in tight formations change gradually from transient flow (early times) to BDF (late times) as the production continues. Despite different approaches/methods, the field case studies demonstrate that the accurate framework for strategic well planning including prediction of optimum well location is very critical, especially for the realization of the commercial benefit (i.e., increasing and accelerating of reserve or assets) from infilled drilling campaign. Also, the proposed framework and findings of this study provide new insight into infilled drilling campaigns including the importance of better evaluation of infill drilling performance in tight formations, which eventually assist on informed decisions process regarding future development plans.

scholarly journals Geothermal Boreholes in Poland—Overview of the Current State of Knowledge

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3251
Author(s):  
Tomasz Sliwa ◽  
Aneta Sapińska-Śliwa ◽  
Andrzej Gonet ◽  
Tomasz Kowalski ◽  
Anna Sojczyńska
Keyword(s):  
Heat Exchangers ◽  
Oil And Gas ◽  
Produced Water ◽  
Geothermal Water ◽  
Laboratory System ◽  
Water Production ◽  
Injection Wells ◽  
Geological Conditions ◽  
Geothermal Wells ◽  
Borehole Heat Exchangers

Geothermal energy can be useful after extraction from geothermal wells, borehole heat exchangers and/or natural sources. Types of geothermal boreholes are geothermal wells (for geothermal water production and injection) and borehole heat exchangers (for heat exchange with the ground without mass transfer). The purpose of geothermal production wells is to harvest the geothermal water present in the aquifer. They often involve a pumping chamber. Geothermal injection wells are used for injecting back the produced geothermal water into the aquifer, having harvested the energy contained within. The paper presents the parameters of geothermal boreholes in Poland (geothermal wells and borehole heat exchangers). The definitions of geothermal boreholes, geothermal wells and borehole heat exchangers were ordered. The dates of construction, depth, purposes, spatial orientation, materials used in the construction of geothermal boreholes for casing pipes, method of water production and type of closure for the boreholes are presented. Additionally, production boreholes are presented along with their efficiency and the temperature of produced water measured at the head. Borehole heat exchangers of different designs are presented in the paper. Only 19 boreholes were created at the Laboratory of Geoenergetics at the Faculty of Drilling, Oil and Gas, AGH University of Science and Technology in Krakow; however, it is a globally unique collection of borehole heat exchangers, each of which has a different design for identical geological conditions: heat exchanger pipe configuration, seal/filling and shank spacing are variable. Using these boreholes, the operating parameters for different designs are tested. The laboratory system is also used to provide heat and cold for two university buildings. Two coefficients, which separately characterize geothermal boreholes (wells and borehole heat exchangers) are described in the paper.

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