scholarly journals The fault plane as the main fluid pathway: geothermal field development options under subsurface and operational uncertainty

Author(s):  
Alexandros Daniilidis ◽  
Sanaz Saeid ◽  
Nima Gholizadeh Doonechaly
Author(s):  
Ady Setya Nugroho

<p><span><span><span>Lapangan Panas Bumi Dieng beroperasi sejak tahun 2004 dengan kapasitas turbin 60 MW serta memiliki target produksi sebesar 55 MW selama tigapuluh tahun. Lapangan ini, masih layak untuk dilakukan pengembangan dengan total sebesar 110 MW. Dalam mengoptimalkan kualitas uap (<em>steam quality</em>) dari kepala sumur sampai dengan input turbin maka perlu adanya perencanan mengenai dimensi dari pipa yang mengalirkan uap. Parameter yang diperhatikan dalam perencanaan pipa dua fasa yaitu diameter pipa dan penurunan tekanan. Tujuan penelitian adalah menentukan diameter pipa dua fasa dan penurunan tekanan pada salah satu sumur pengembangan lapangan Panas Bumi Dieng. Metodologi perhitungan dimensi pipa ini menggunakan standar ASME dalam penentuan diameter pipa dan menghitung besarnya penurunan tekanan sebelum input turbin menggunakan <em>software pipesim. </em>Hasil perhitungan salah satu sumur yang memiliki masa aliran sebesar 60 kg/s <span> </span>didapatkan jenis pipa Xtra Strong (XS) kualitas uap 0.176 dengan diameter pipa 8 inchi serta kecepatan aliran yang optimal sebesar 27.33 m/s <span> </span>serta penurunan tekanan dari <em>well head</em> menuju separator adalah 7, 476 bar dengan tekanan input turbin sebesar 22,985 bar.</span></span></span></p><p><em>Dieng Geothermal Field operates since 2004 with a 60 MW turbine capacity and has a production target of 55 MW for thirty years. This field is still feasible for development with a total of 110 MW. In optimizing the quality of steam (steam quality) from the wellhead to the turbine input, it is necessary to plan on the dimensions of the pipe that flows steam. Parameters that are considered in planning two-phase pipes are pipe diameter and pressure drop. The research objective was to determine the two-phase pipe diameter and pressure drop at one of the wells in the Dieng Geothermal field development. The methodology for calculating the pipe dimensions uses the ASME standard in determining pipe diameter and calculating the amount of pressure drop before the turbine input using pipesim software. The calculation results of one well that has a flow period of 60 kg / s obtained Xtra Strong (XS) pipe type vapor quality 0.176 with 8 inches pipe diameter and optimal flow velocity of 27.33 m / s and pressure drop from well head to separator is 7 , 476 bars with turbine input pressure of 22,985 bars.</em></p>


2018 ◽  
Vol 45 ◽  
pp. 243-249
Author(s):  
Wenli Wang ◽  
Julia Diessl ◽  
Michael S. Bruno

Abstract. GeoMechanics Technologies has investigated the surface deformation that occurred at a geothermal field operation located in New Zealand. The thermal area associated with this field has extensive surface infrastructures that are in close proximity to a lake. Geothermal operations initially began in 1997 while surface subsidence has been observed since early 2004. We were contracted by the client to review and analyze the impact of future development plans on ground level changes in hopes to mitigate further compaction and subsidence in the area. There is significant concern that continued surface subsidence may cause the lake to flood the surrounding area. An integrated 3-D geological model, geomechanical model, and fluid and heat flow model were developed for this study. To ensure accuracy, a history match and calibration was performed on the geomechanical model using historical subsidence survey data and on the fluid and heat flow simulation using historical injection and production data. The calibrated geomechanical model was then applied to simulate future scenarios to predict surface subsidence and provide a guideline to optimize field development plans.


2021 ◽  
Author(s):  
S.P. Szklarz ◽  
E.G.D. Barros ◽  
S.H.J. Peeters ◽  
N. Khoshnevis Gargar ◽  
J.D.A.M. van Wees ◽  
...  

Author(s):  
N.А. Eremin ◽  
◽  
A.D. Chernikov ◽  
O.N. Sardanashvili ◽  
V.E. Stolyarov ◽  
...  
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