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6th ITB International geothermal Workshop, IIGW 2017

作者： Hidayat, Iki Sutopo Pratama, Heru Berian Study Program of Petroleum Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Study Program of Geothermal Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Jl. Ganeca No. 10 West java Bandung40132 Indonesia

The Kerinci geothermal field is one phase liquid reservoir system in the Kerinci District, western part of Jambi Province. In this field, there are geothermal prospects that identified by the heat source up flow inside a National Park area. Kerinci field was planned to develop 1×55 MWe by Pertamina geothermal Energy. To define reservoir characterization, the numerical simulation of Kerinci field is developed by using TOUGH2 software with information from conceptual model. The pressure and temperature profile well data of KRC-B1 are validated with simulation data to reach natural state condition. The result of the validation is suitable matching. Based on natural state simulation, the resource assessment of Kerinci geothermal field is estimated by using Monte Carlo simulation with the result P10-P50-P90 are 49.4 MW, 64.3 MW and 82.4 MW respectively. This paper is the first study of resource assessment that has been estimated successfully in Kerinci geothermal Field using numerical simulation coupling with Monte carlo simulation. © Published under licence by IOP Publishing Ltd.

关键词： Monte Carlo methods

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Probabilistic approach: Back pressure turbine for geothermal vapor-dominated system 6

Probabilistic approach: Back pressure turbine for geothermal...

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6th ITB International geothermal Workshop, IIGW 2017

作者： Ahmad, Angga Alfandi Guwowijoyo, Fransiscus Xaverius Pratama, Heru Berian Geothermal Engineering Study Program Faculty of Mining and Petroleum Bandung Institute of Technology Jl. Ganesha No.10 Bandung40132 Indonesia

geothermal bussiness nowadays needs to be accelerated in a way that profit can be obtained as soon as reasonable possible. One of the many ways to do this is by using one of geothermal wellhead generating unit (GWGU), called backpressure turbine. Backpressure turbine can be used in producing electricity as soon as there is productive or rather small-scale productive well existed after finished drilling. In a vapor dominated system, steam fraction in the wellhead capable to produce electricity based on each well productivity immediately. The advantage for using vapor dominated system is reduce brine disposal in the wellhead so it will be a cost benefit in operation. The design and calculation for backpressure turbine will use probablistic approach with Monte Carlo simulation. The parameter that will be evaluated in sensitivity would be steam flow rate, turbine inlet pressure, and turbine exhaust pressure/atmospheric pressure. The result are probability for P10, P50, and P90 of gross power output which are 1.78 MWe, 2.22 MWe and 2.66 Mwe respectively. Whereas the P10, P50, and P90 of SSC are 4.67 kg/s/MWe, 5.19 kg/s/MWe and 5.78 kg/s/MWe respectively. © Published under licence by IOP Publishing Ltd.

关键词： Monte Carlo methods

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Analysis of Focal Mechanism for Determine Fault Plane Orientation Using the Moment Tensor Inversion Case study : West Java geothermal Field 2

Analysis of Focal Mechanism for Determine Fault Plane Orient...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Sultan, Rhamadhana Rachmat Sule, Mohammad Hendriyana, Andri Supendi, Pepen Geothermal Engineering Study Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 West Java Bandung40132 Indonesia

Micro earthquakes in geothermal field is used to monitor subsurface conditions especially in the reservoir. Micro earthquakes data can be used to determine focal mechanism or fault plane solution with moment tensor inversion method using ISOLA program in MATLAB-GUI. Focal mechanism or fault plane solution describes the orientation of the fault and slip on the fault relative to a geographical coordinate system. The arrival time of the P wave from the 3-component seismometer recording is used in moment tensor inversion and the frequency band that used is 0.02 to 0.08 Hz. The result of inversion with minor error indicated by the value of variance reduction approaching 1 calculated is from modelling waveform synthetic with green function and waveform observation. Fault plane solution in the field that represented by beach ball describes the dominant fault in the North is oblique fault with dip 30-90 degree and in the South is reverse fault with dip 20-85 degree. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： MATLAB

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Make-up wells drilling cost in financial model for a geothermal project 6

Make-up wells drilling cost in financial model for a geother...

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6th ITB International geothermal Workshop, IIGW 2017

作者： Purwaningsih, Fitri Oktaviani Husnie, Ruly Afuar, Waldy Abdurrahman, Gugun Study Program of Geothermal Engineering Faculty of Mining and Petroleum Bandung Institute of Technology Bandung Indonesia PT Geo Dipa Energy Jakarta Indonesia

After commissioning of a power plant, geothermal reservoir will encounter pressure decline, which will affect wells productivity. Therefore, further drilling is carried out to enhance steam production. Make-up wells are production wells drilled inside an already confirmed reservoir to maintain steam production in a certain level. Based on Sanyal (2004), geothermal power cost consists of three components, those are capital cost, O&M cost and make-up drilling cost. The make-up drilling cost component is a major part of power cost which will give big influence in a whole economical value of the project. The objective of this paper it to analyse the make-up wells drilling cost component in financial model of a geothermal power project. The research will calculate make-up wells requirements, drilling costs as a function of time and how they influence the financial model and affect the power cost. The best scenario in determining make-up wells strategy in relation with the project financial model would be the result of this research. © Published under licence by IOP Publishing Ltd.

关键词： Costs

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Application of experimental design in geothermal resources assessment of Ciwidey-Patuha, West Java, Indonesia 6

Application of experimental design in geothermal resources a...

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6th ITB International geothermal Workshop, IIGW 2017

作者： Ashat, Ali Pratama, Heru Berian Geothermal Engineering Study Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 West Java Bandung40132 Indonesia

The successful Ciwidey-Patuha geothermal field size assessment required integration data analysis of all aspects to determined optimum capacity to be installed. Resources assessment involve significant uncertainty of subsurface information and multiple development scenarios from these field. Therefore, this paper applied the application of experimental design approach to the geothermal numerical simulation of Ciwidey-Patuha to generate probabilistic resource assessment result. This process assesses the impact of evaluated parameters affecting resources and interacting between these parameters. This methodology have been successfully estimated the maximum resources with polynomial function covering the entire range of possible values of important reservoir parameters. © Published under licence by IOP Publishing Ltd.

关键词： geothermal fields

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study of sustainable production in two-phase liquid dominated with steam cap underlying brine reservoir by numerical simulation 6

Study of sustainable production in two-phase liquid dominate...

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6th ITB International geothermal Workshop, IIGW 2017

作者： Pratama, Heru Berian Saptadji, Nenny Miryani Study Program of Geothermal Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Jl. Ganesha No.10 West Java Bandung40132 Indonesia

The main issue in the management of the two-phase liquid-dominated geothermal field is rapid decline pressure in the reservoir so that the supply of steam to the power plant cannot be fulfilled. To understanding that, modelling and numerical simulation used reservoir simulators. The model is developed on liquid-dominated geothermal fields are assessed in various scenarios of production strategies (focusing only steam cap, brine reservoir and a combination) and injection strategies (deep and shallow injection, centered and dispersed injection), with the calculation using separated steam cycle method. The simulation results of the model for sustainable production are production 25% from steam cap + 75% from brine reservoir, dispersed and deep reinjection with make-up wells from steam cap results 9 make-up well number. The implementation of production-injection strategy needs to be planned right from the beginning of exploitation so that the strategy can adapt to changes in reservoir characteristics. © Published under licence by IOP Publishing Ltd.

关键词： Numerical models

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geothermal system boundary at the northern edge of Patuha geothermal Field based on integrated study of volcanostratigraphy, geological field mapping, and cool springs contamination by thermal fluids 6

Geothermal system boundary at the northern edge of Patuha Ge...

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6th ITB International geothermal Workshop, IIGW 2017

作者： Suryantini Rachmawati, C. Abdurrahman, M. Geology Engineering Study Program Faculty of Earth Sciences and Technology Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Geothermal Technology Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia

Patuha geothermal System is a volcanic hydrothermal system. In this type of system, the boundary of the system is often determined by low resistivity (10 ohm.m) anomaly from Magnetotelluric (MT) or DC-Resistivity survey. On the contrary, during geothermal exploration, the system boundary often need to be determined as early as possible even prior of resistivity data available. Thus, a method that use early stage survey data must be developed properly to reduce the uncertainty of the geothermal area extent delineation at the time the geophysical data unavailable. Geological field mapping, volcanostratigraphy analysis and fluid chemistry of thermal water and cold water are the data available at the early stage of exploration. This study integrates this data to delineate the geothermal system boundary. The geological mapping and volcanostratigraphy are constructed to limit the extent of thermal and cold springs. It results that springs in the study area are controlled hydrologically by topography of Patuha Volcanic Crown (complex) or so called PVC, the current geothermal field and Masigit Volcanic Crown (complex) or so called MVC, the dormant volcano not associated with active geothermal system. Some of the cold springs at PVC are contaminated by subsurface steam heated outflow while others are not contaminated. The contaminated cold springs have several characteristics such as higher water temperature than ambient temperature at the time it was measured, higher total disolved solid (TDS), and lower pH. The soluble elements analysis support the early contamination indication by showing higher cation and anion, and positive oxygen shifting of stable isotope of these cool springs. Where as the uncontaminated spring shows similar characteristic with cool springs occur at MVC. The boundary of the system is delineated by an arbitrary line drawn between distal thermal springs from the upflow or contaminated cool springs with the cool uncontaminated springs. This boundary is

关键词： Surveys

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Comparison of resource assessment methods with numerical reservoir model between heat stored and experimental design: Case study Ciwidey-Patuha geothermal field 7

Comparison of resource assessment methods with numerical res...

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7th ITB International geothermal Workshop 2018, IIGW 2018

作者： Ashat, Ali Pratama, Heru Berian Itoi, Ryuichi Department of Earth Resources Engineering Faculty of Engineering Kyushu Univ. Fukuoka819-0395 Japan Geothermal Engineering Study Program Institut Teknologi Bandung Jl. Ganesha No.10 West-Java-Bandung Indonesia

A successful geothermal field size assessment requires integrative data analysis of all aspects to determine the optimum capacity to be installed. Nowadays, numerical simulation becomes a powerful tool in a geothermal resource assessment process. However, this method involves significant uncertainty of subsurface information as an input. Then a study of resource assessment methods, such as heat stored and experimental design, needs inputs coming from the result/output of reservoir numerical. The calculation of both methods based on a range of reservoir parameter values can be carried out using stochastic methods (Monte Carlo Simulation). It applies a probabilistic method of resource assessment to capture uncertainties. A sophisticated numerical reservoir model of Ciwidey-Patuha geothermal Field, West Java-Indonesia in the natural state condition was used as a case study to determine the generating potential of the reservoir. © Published under licence by IOP Publishing Ltd.

关键词： geothermal fields

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Statistical Analysis of Mercury Data from Soil Survey in Non-volcanic geothermal System: A Case study in Sulawesi

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Procedia Earth and Planetary Science 2013年 6卷 212-218页

作者： Suryantini Applied Geology Research Division (KK GeologiTerapan) Faculty of Earth Sciences and Engineering (FITB) InstitutTeknologi Bandung (ITB) Jl. Ganesha 10 Bandung 40132 Indonesia Geothermal Technology Study Program FTTM ITB Bandung Indonesia

Mercury analysis from soil survey is one of the standard methods in geothermal exploration surveys conducted by Center for Survey and Geological Data or PSDG (formerly DIM). The objective of this paper is to analyze thresholds of four non volcanic geothermal systems in Sulawesi, i.e. Suwawa, Marana, Pincara and Mangolo. The value of Hg (ppb) is differ from one prospect to another. Its value ranges from tens ppb up to few thou sands ppb, depends on the geology and geothermal system; in high temperature volcanic geothermal system, or in non-volcanic geothermal system. Therefore determination of threshold that separate background and anomaly is important for better delineation of Hg anomaly area. Prior to threshold determination, a probability plot is used to examine the normality and the existence of sub population within the data. Sub population located at the end left of probability graph or sub population with the lowest range value is assumed containing the background and threshold information. The threshold is then calculated using mean plus one standard deviation of data within this sub population. Comparison of the calculated number with the published threshold value shows very significant difference in term of anomaly area coverage for further exploration target. This paper demonstrates Exploratory Data Analysis (EDA) techniques that can be applied as a tool to determine threshold value. The results suggest that this statistical methodis able to assist and support a better threshold value determination.

关键词： Mercury Exploratory Data Analysis Non-volcanic geothermal system Sulawesi

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Mathematical Modelling of Silica Scaling Deposition in geothermal Wells

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IOP Conference Series: Earth and Environmental Science 2016年第1期42卷

作者： M Nizami Sutopo Petroleum Engineering Study Program Institut Teknologi Bandung Indonesia Geothermal Engineering Study Program Institut Teknologi Bandung Indonesia

Silica scaling is widely encountered in geothermal wells in which produce two-phase geothermal fluid. Silica scaling could be formed due to chemical reacting by mixing a geothermal fluid with other geothermal fluid in different compositions, or also can be caused by changes in fluid properties due to changes pressure and temperature. One of method to overcome silica scaling which is occurred around geothermal well is by workover operation. Modelling of silica deposition in porous medium has been modeled in previously. However, the growth of silica scaling deposition in geothermal wells has never been modeled. Modelling of silica deposition through geothermal is important aspects to determine depth of silica scaling growth and best placing for workover device to clean silica scaling. This study is attempted to develop mathematical models for predicting silica scaling through geothermal wells. The mathematical model is developed by integrating the solubility-temperature correlation and two-phase pressure drop coupled wellbore fluid temperature correlation in a production well. The coupled model of two-phase pressure drop and wellbore fluid temperature correlation which is used in this paper is Hasan-Kabir correlation. This modelling is divided into two categories: single and two phase fluid model. Modelling of silica deposition is constrained in temperature distribution effect through geothermal wells by solubility correlation for silica. The results of this study are visualizing the growth of silica scaling thickness through geothermal wells in each segment of depth. Sensitivity analysis is applied in several parameters, such as: bottom-hole pressure, temperature, and silica concentrations. Temperature is most impact factor for silica scaling through geothermal wellbore and depth of flash point. In flash point, silica scaling thickness has reached maximum because reducing of mole in liquid portion.

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