Numerical Study on the Temperature Behavior in Naturally Fractured Geothermal Reservoirs and Analysis Methodology for Geothermal Reservoir Characterization and Development

2021 ◽  
Author(s):  
Cao Wei ◽  
Shiqing Cheng ◽  
Bin Jiang ◽  
Ruilian Gao ◽  
Yang Wang ◽  
...  
Keyword(s):  
Pressure Field ◽  
Temperature Data ◽  
Geothermal Reservoir ◽  
Reservoir Temperature ◽  
Development Potential ◽  
Temperature Changes ◽  
Geothermal Reservoirs ◽  
Naturally Fractured ◽  
Heat Expansion ◽  
Pressure Analysis

Abstract An important way to develop geothermal energy is by producing low-medium temperature fluids from naturally fractured geothermal reservoirs. Pressure analysis is the most used to characterize such reservoirs for improving development efficiency. However, pressure inversion easily leads to non-uniqueness and cannot estimate thermal properties. Additionally, no reliable methods are proposed to evaluate the development potential of geothermal reservoirs. To narrow the gap, this study aims at studying the temperature behaviors and exploring suitable analysis method for characterizing geothermal reservoir and evaluating development potential. The numerical and analytical models are simultaneously established to analyze the temperature behaviors. Our models account for the J-T effect (μJT), adiabatic heat expansion/compression effect (η), reservoir damage, viscous dissipation, heat conduction and convection effects. The solution's development is dependent on the fact that the effects of reservoir temperature changes on transient pressure can be ignored so that the pressure and energy equations can be decoupled. We firstly compute reservoir pressure field based on Kazemi model, then use this obtained pressure field to solve the energy-balance equations. The numerical solution is verified and is found to be in good agreement with the proposed analytical solutions. This work shows that the most used constant μJT and η assumption will produce inaccurate temperature results when reservoir temperature changes significantly. Moreover, we find that temperature behaviors can exhibit three heat radial flow regimes (HRFR) and a heat inter-porosity regime with V-shape characteristic. Fracture thermal storativity ratio and matrix heat inter-porosity coefficient defined in this study can be estimated from this characteristic, which are further used to evaluate geothermal development potential. Our work also shows that temperature data can give information that would not be provided by conventional pressure analysis. The temperature derivative curve will show ‘hump’ characteristic if reservoir is damaged. The temperature data can characterize the skin-zone radius and permeability. More than that, the properties such as J-T coefficient, effective adiabatic heat expansion coefficient and porosity can be estimated. Eventually, an integrated workflow of using both temperature and pressure data analysis is presented to characterize naturally fractured geothermal reservoir for the first time. Simulated test examples were interpreted to demonstrate its applicability.

scholarly journals Density-thermal dependence of sedimentary associations calls to reinterpreting detailed gravity surveys

2015 ◽  
Vol 58 ◽  
Author(s):  
Vagif G. Gadirov ◽  
Lev V. Eppelbaum
Keyword(s):  
Gravity Field ◽  
Underground Water ◽  
Temperature Data ◽  
Field Analysis ◽  
Thermal Dependence ◽  
Temperature Changes ◽  
Buried Objects ◽  
Gravity Effects ◽  
Hydrocarbon Deposits ◽  
Hydrocarbon Deposit

<p>The modern gravimetric equipment allows to register very small effects of gravity field changes and can be applied solving different geological, geophysical and environmental problems. However, sometimes insufficient calculation of various kinds of geological noise complicates effective application of detailed gravity field analysis. One of such factors is the temperature regime over and outside different buried objects of investigation. In this paper temperature changes in a subvertical zone over a hydrocarbon deposit and outside its contour are analyzed. The integrated density change and corresponding gravity effects are calculated for the Muradkhanly oil deposit situated within the south-east part of the Middle Kura Depression (central Azerbaijan). Calculation of these effects on the basis of density- temperature data correlation analysis could significantly improve the microgravity field examination over the hydrocarbon deposits. The similar correction procedure may be applied also over underground water horizons and some environmental targets.</p>

Modeling Reservoir Temperature Transients and Reservoir-Parameter Estimation Constrained to the Model

2010 ◽  
Vol 13 (06) ◽  
pp. 873-883 ◽  
Author(s):  
Obinna O. Duru ◽  
Roland N. Horne
Keyword(s):  
Flow Rate ◽  
Oil And Gas ◽  
Mechanistic Model ◽  
Operator Splitting ◽  
Temperature Data ◽  
Temperature Measurements ◽  
Solution Technique ◽  
Measured Temperature ◽  
Reservoir Temperature ◽  
Temperature Transient

Summary Permanent downhole gauges (PDGs) provide a continuous source of downhole pressure, temperature, and sometimes flow-rate data. Until recently, the measured temperature data have been largely ignored, although a close observation of the temperature measurements reveals a response to changes in flow rate and pressure. This suggests that the temperature measurements may be a useful source of reservoir information. In this study, reservoir temperature-transient models were developed for single- and multiphase-fluid flows, as functions of formation parameters, fluid properties, and changes in flow rate and pressure. The pressure fields in oil- and gas-bearing formations are usually transient, and this gives rise to pressure/temperature effects appearing as temperature change. The magnitudes of these effects depend on the properties of the formation, flow geometry, time, and other factors and result in a reservoir temperature distribution that is changing in both space and time. In this study, these thermometric effects were modeled as convective, conductive, and transient phenomena with consideration for time and space dependencies. This mechanistic model included the Joule-Thomson effects resulting from fluid compressibility and viscous dissipation in the reservoir during fluid flow. Because of the nature of the models, the semianalytical solution technique known as operator splitting was used to solve them, and the solutions were compared to synthetic and real temperature data. In addition, by matching the models to different temperature-transient histories obtained from PDGs, reservoir parameters such as average porosity, near-well permeabilities, saturation, and some thermal properties of the fluid and formation could be estimated. A key target of this work was to show that temperature measurements, often ignored, can be used to estimate reservoir parameters, as a complement to other more-conventional techniques.

scholarly journals Temperature Measurement Reliability and Validity With Thermocouple Extension Leads or Changing Lead Temperature

2010 ◽  
Vol 45 (6) ◽  
pp. 642-644 ◽  
Author(s):  
Lisa S. Jutte ◽  
Blaine C. Long ◽  
Kenneth L. Knight
Keyword(s):  
Measurement Error ◽  
Temperature Measurement ◽  
Laboratory Study ◽  
Reliability And Validity ◽  
Temperature Data ◽  
Water Bath ◽  
Measurement Reliability ◽  
Temperature Changes ◽  
Ice Pack

Abstract Context: Thermocouples' leads are often too short, necessitating the use of an extension lead. Objective: To determine if temperature measures were influenced by extension-lead use or lead temperature changes. Design: Descriptive laboratory study. Setting: Laboratory. Other Participants: Experiment 1: 10 IT-21 thermocouples and 5 extension leads. Experiment 2: 5 IT-21 and PT-6 thermocouples. Methods: In experiment 1, temperature data were collected on 10 IT-21 thermocouples in a stable water bath with and without extension leads. In experiment 2, temperature data were collected on 5 IT-21 and PT-6 thermocouples in a stable water bath before, during, and after ice-pack application to extension leads. Results: In experiment 1, extension leads did not influence IT-21 validity (P  =  .45) or reliability (P  =  .10). In experiment 2, postapplication IT-21 temperatures were greater than preapplication and application measures (P &lt; .05). Conclusions: Extension leads had no influence on temperature measures. Ice application to leads may increase measurement error.

scholarly journals POTENSI PANAS BUMI DI KABUPATEN MANOKWARI SELATAN PROVINSI PAPUA BARAT BERDASARKAN ANALISA GEOKIMIA

2017 ◽  
Vol 6 (2) ◽  
pp. 83
Author(s):  
Agustinus Denny Unggul Raharjo ◽  
Nur Prasetyo Ponco Nugroho ◽  
Hastowo Resesiyanto
Keyword(s):  
Population Growth ◽  
Natural Resources ◽  
Geothermal Reservoir ◽  
Reservoir Temperature ◽  
Geothermal Resources ◽  
Autonomous Region ◽  
Electric Generator ◽  
Binary Cycle ◽  
West Papua ◽  
Papua Barat

ABSTRAKKabupaten Manokwari Selatan merupakan daerah otonomi baru di Provinsi Papua Barat dengan potensi sumberdaya alam besar. Sebagai daerah pemekaran baru, kedepan akan mengalami pertambahan penduduk yang signifikan. Pertambahan penduduk bersama dengan pembangunan dan modernisasi akan membawa beban pada kebutuhan listrik, sebagai alternatif pemenuhan listrik dapat dengan cara memanfaatkan sumberdaya panasbumi yang terdapat di Kampung Demini, Distrik Momiwaren. Penelitian bertujuan mengetahui potensi sumberdaya panasbumi di Kampung Demini dengan menggunakan metode geothermometer untuk perkiraan suhu reservoir panasbumi berdasarkan kandungan SiO2, Na, dan K. Berdasarkan hasil penelitian, walaupun berjenis suhu rendah, mata air panas Demini dapat dikembangkan menjadi pembangkit listrik siklus binari. Kata kunci: Panasbumi, Siklus Binari, Kabupaten Manokwari Selatan ABSTRACTSouth Manokwari Regency is a new autonomous region in West Papua Province with abundant natural resources. As new autonomous region the regency will experienced significant population growth. Population growth along with development and modernization will give burden to electricity demand. Alternatively, electricity could be acquired with geothermal resources in Demini vilage, Momiwaren District. The research aims to reveals the geothermal resources potent in Demini vilage using geothermometer method to predict the geothermal reservoir temperature. Based on survey the geothermal resources, altough lowenthalpy type, could be developed into binary cycle electric generator. Keywords: Geothermal, Binary Cycle, South Manokwari Regency

scholarly journals The Estimation of Reservoir Temperature for Thermal Springs Using the Integrated Multicomponent Geothermometry Method at Changbai Mountain, Northeastern Songliao Basin, China

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Jin Na ◽  
Bai-zhong Yan ◽  
Bao-ming Chi ◽  
Bo Feng ◽  
Xue Jiang
Keyword(s):  
Changbai Mountain ◽  
Geothermal Reservoir ◽  
Thermal Springs ◽  
Reservoir Temperature ◽  
Deep Circulation ◽  
Volcanic Region ◽  
Geothermal Fields ◽  
Resource Conditions ◽  
Songliao Plain ◽  
Circulation Characteristics

The Changbai Mountain volcanic region, eastern Songliao Plain, China, is considered a potential target development area for geothermal water exploitation. To assess the feasibility of geothermal development, we applied integrated multicomponent geothermometry (IMG) in the program GeoT to estimate the geothermal reservoir temperatures for four major thermal springs in this area. Numerical optimizations of Al and HCO3- concentrations, dilutions, and steam fractions were conducted to reconstruct the original deep fluid compositions by the IMG method. The results show that the geothermal reservoir temperatures of these springs range from 118 to 172°C in the Changbai Mountain volcanic region. In contrast to classic geothermometers, the IMG method can quantify processes affecting the fluid chemical composition and yield reasonable temperatures. The reservoir temperatures for the Julong and Jinjiang thermal springs are significantly greater than those for the Shibadaogou and Xianrenqiao thermal springs. Moreover, the geothermal deep circulation characteristics of the above springs are also investigated based on reservoir temperature estimates. The methods presented in this study could be applied to other geothermal fields under similar geothermal resource conditions.

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