检索结果-内蒙古大学图书馆

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

IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Fitri Oktaviani Purwaningsih Ruly Husnie Waldy Afuar Gugun Abdurrahman 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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Probabilistic approach: back pressure turbine for geothermal vapor-dominated system

引用

IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Angga Alfandi Ahmad Fransiscus Xaverius Guwowijoyo Heru Berian Pratama Geothermal Engineering Study Program Faculty of Mining and Petroleum Bandung Institute of Technology Jl. Ganesha No.10 Bandung Indonesia 40132

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Ali Ashat Heru Berian Pratama Geothermal Engineering Study Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 Bandung West Java Indonesia. 40132

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Smart geo-energy village development by using cascade direct use of geothermal energy in Bonjol, West Sumatera

引用

IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Novrisal Prasetya Defry Erwinsyah Umra Lubis Dharmawan Raharjo Nenny Miryani Saptadji Heru Berian Pratama Study Program of Petroleum Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology (ITB Study Program of Geothermal Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology (ITB) Jl. Ganesha No.10 Bandung West Java Indonesia. 40132

West Sumatera is a province which has a huge geothermal potential - approximately 6% of Indonesia's total geothermal potential which equals to 1,656 MWe. One of the significant reserves located in Bonjol subdistrict which accounts for more than 50 MWe. The energy from geothermal manifestation in Bonjol can be utilized prior to indirect development. Manifestation at the rate 3 kg/s and 87 °C will flow to cascading system consisting several applications, arranged in order from high to low temperature to efficiently use the excessive energy. The direct use application selected is based on the best potential commodities as well as temperature constraint of heat source. The objective of this paper is to perform a conceptual design for the first cascade direct use of geothermal energy in Indonesia to establish Bonjol Smart Geo-Energy Village which will be transformed as the center of agricultural, stockbreeding, tourism as well as cultural site. A comprehenssive research was performed through remote survey area, evaluation featured product, analysis of heat loss and heat exchange in cascade system. From potential commodities, the three applications selected are cocoa drying and egg hatching incubation machine as well as new tourism site called Terapi Panas Bumi. The optimum temperature for cocoa drying is 62°C with the moisture content 7% which consumes 78 kW for one tones cocoa dried. Whereas, egg incubation system consists of two chamber with the same temperature 40°C for each room and relative humidity 55% and 70%. For the last stage, Terapi Panas Bumi works in temperature 40°C. Based on the result technical and economical aspect, it exhibits cascade direct use of geothermal energy is very recommended to develop.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Heru Berian Pratama Nenny Miryani Saptadji Study Program of Geothermal Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Jl. Ganesha No.10 Bandung West Java Indonesia. 40132

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Suryantini C Rachmawati M Abdurrahman Geology Engineering Study Program Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia Jl Ganesha 10 Bandung 40132 Geothermal Technology Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Jl Ganesha 10 Bandung 40132

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：

来源：评论

学校读者我要写书评

暂无评论

Preliminary determination of geothermal working area based on Thermal Infrared and Synthetic Aperture Radar (SAR) remote sensing

引用

IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Indra Agoes Nugroho Beta Kurniawahidayati Reza Syahputra Mulyana Asep Saepuloh Geothermal Engineering Master Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung (ITB) Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia. Geology Engineering Study Program Faculty of Earth Sciences and Technology Institut Teknologi Bandung (ITB) Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia.

Remote sensing is one of the methods for geothermal exploration. This method can be used to map the geological structures, manifestations, and predict the geothermal potential area. The results from remote sensing were used as guidance for the next step exploration. Analysis of target in remote sensing is an efficient method to delineate geothermal surface manifestation without direct contact to the object. The study took a place in District Merangin, Jambi Province, Indonesia. The area was selected due to existing of Merangin volcanic complex composed by Mounts Sumbing and Hulunilo with surface geothermal manifestations presented by hot springs and hot pools. The location of surface manifestations could be related with local and regional structures of Great Sumatra Fault. The methods used in this study were included identification of volcanic products, lineament extraction, and lineament density quantification. The objective of this study is to delineate the potential zones for sitting the geothermal working site based on Thermal Infrared and Synthetic Aperture Radar (SAR) sensors. The lineament-related to geological structures, was aimed for high lineament density, is using ALOS - PALSAR (Advanced Land Observing Satellite - The Phased Array type L-band Synthetic Aperture Radar) level 1.1. The Normalized Difference Vegetation Index (NDVI) analysis was used to predict the vegetation condition using Landsat 8 OLI-TIRS (The Operational Land Imager – Thermal Infrared Sensor). The brightness temperature was extracted from TIR band to estimate the surface temperature. geothermal working area identified based on index overlay method from extracted parameter of remote sensing data was located at the western part of study area (Graho Nyabu area). This location was identified because of the existence of high surface temperature about 30°C, high lineament density about 4 - 4.5 km/km2 and low NDVI values less than 0.3.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Mathematical Modelling of Silica Scaling Deposition in geothermal Wells

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Effectiveness of Hydrothermal Alteration Mapping based on Hyperspectral Data in Tropical Region

引用

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

作者： R R D Muhammad A Saepuloh Geothermal Technology Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Geology Engineering Study Program Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia

Hyperspectral remote sensing could be used to characterize targets at earth's surface based on their spectra. This capability is useful for mapping and characterizing the distribution of host rocks, alteration assemblages, and minerals. Contrary to the multispectral sensors, the hyperspectral identifies targets with high spectral resolution. The Wayang Windu geothermal field in West Java, Indonesia was selected as the study area due to the existence of surface manifestation and dense vegetation environment. Therefore, the effectiveness of hyperspectral remote sensing in tropical region was targeted as the study objective. The Spectral Angle Mapper (SAM) method was used to detect the occurrence of clay minerals spatially from Hyperion data. The SAM references of reflectance spectra were obtained from field observation at altered materials. To calculate the effectiveness of hyperspectral data, we used multispectral data from Landsat-8. The comparison method was conducted by comparing the SAM's rule images from Hyperion and Landsat-8, resulting that hyperspectral was more accurate than multispectral data. Hyperion SAM's rule images showed lower value compared to Landsat-8, the significant number derived from using Hyperion was about 24% better. This inferred that the hyperspectral remote sensing is preferable for mineral mapping even though vegetation covered study area.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Geology Structure Identification based on Polarimetric SAR (PolSAR) Data and Field Based Observation at Ciwidey geothermal Field

引用

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

作者： R A Pradipta A Saepuloh Suryantini Geothermal Technology Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Geology Engineering Study Program Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia

Geological structure observation is difficult to be conducted at Quaternary volcanic field due to the classical problem at tropical region such as intensive erosion, dense vegetation covers, and rough terrain. The problem hampers the field observation especially for geological structures mapping. In order to overcome the problems, an active remote sensing technology based on Polarimetric Synthetic Aperture Radar (PolSAR) data was used in this study. The longer wavelength of microwave than optical region caused the SAR layer penetration higher than optics. The Ciwidey geothermal Field, Indonesia was selected as study area because of the existence of surface manifestations with lack information about the control of geological structures to the geothermal system. Visual interpretation based on composite polarization modes was applied to identify geological structures at study area. The color composite Red-Green-Blue for HV-HH-VV polarizations provided highest texture and structural features among the other composite combination. The Linear Features Density (LFD) map was also used to interpret the fractures zones. The calculated LFD showed high anomaly about 3.6 km/km2 with two strike directions NW-SE and NE-SW. Interestingly, the surface geothermal manifestation agreed with the low anomaly of LFD. The geological structures consisted of ten faults were successfully detected and mapped. The faults type mainly are oblique-slip with strike directions NE-SW and NW-SE.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：