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All Journal Scientific Contribution Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI
Arif Rahutama
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science

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Best Practices to Achieve Optimal Geothermal Drilling Performance in A Cost-Effective Manner: Case Study of the Fastest Geothermal Well Drilling in Java and Sumatra Bambang Yudho Suranta; Irfan Rasyid; Akhmad Sofyan; Arif Rahutama
Scientific Contributions Oil and Gas Vol. 46 No. 3 (2023): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.46.3.331

Abstract

Indonesia, recognized for possessing substantial geothermal energy potential, is working towards harnessing the resource to achieve numerous objectives. Among the primary challenges encountered is the considerable expense of geothermal drilling. One of the most significant obstacles to achieving this objective is the high drilling cost, which constitutes 35-40% of the total cost of geothermal energy development. The drilling cost is mainly affected by the time needed to drill one well because the faster the time, the lower the cost. Therefore, this research analyzed drilling activities, identified the fastest and most effective methods for optimal geothermal drilling performance, and reduced costs. The research also determined the factors that contributed to the sustained status of Well X as the fastest well drilled in the past decade. The methodology comprised literature review, data collection through adequate background on well and geothermal field, and data analysis. The result showed that the fastest drilling operation of a geothermal well in Indonesia in 2012 occured in West Java (Well X) for only 9.9 days with 1736.5 meters (mMD). Meanwhile, in 2021, Well Y in Sumatra spent 21.74 days to reach a depth of 2200 mMD. The use of a single-run and clean-out Bottom Hole Assembly (BHA) throughout the entire section affected the drilling duration and significantly reduced the inner side cleaning time, respectively. The cost of Well Y drilling, achieved using the best performance of two wells, reduced drilling costs by 19.2%.
Evolusi Busur Magmatik Pulau Jawa Bagian Timur sejak Eosen sampai Kuarter, Berdasarkan Analisis Provenance Batupasir Formasi Sambipitu Arif Rahutama
Lembaran Publikasi Minyak dan Gas Bumi Vol. 55 No. 2 (2021): LPMGB
Publisher : BBPMGB LEMIGAS

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Abstract

Formasi Sambipitu merupakan batuan volkaniklastik berumur Miosen Awal-Akhir yang terbentuk di Cekungan Wonosari pada lingkungan paparan sampai slope yang dibatasi kerucut volkanik di sebelah Barat Laut dan tinggian Wonosari Platform di sebelah Tenggara. Pengamatan sequen stratigraphy dari outcrop menunjukkan proses trangresi di periode awal menuju regresi pada fase highstand dan selanjutnya periode trangresi kedua pada bagian akhir. Batupasir di daerah penelitian dapat dibagi menjadi 2, yaitu batupasir kasar dan batupasir halus, yang digunakan dalam analisis provenance untuk mempelajari dinamika sedimentasi dan tektonik daerah penelitian. Mekanisme sedimentasi didominasi oleh proses saltasi dan suspensi, dikarenakan kondisi lingkungan pengengdapan pada paparan dengan morfologi yang curam akan menyebabkan pergerakan aliran massa yang menghasilkan arus turbit sehingga endapan yang terbentuk didominasi oleh arus traksi. Berdasarkan diagram QFL Dickinson (1985), batuan sumber Formasi Sambipitu berasal dari 2 (dua) mekanisme, yaitu dari magmatic arc dan recycled orogen. Setting tektonik magmatic arc dikarenakan provenance berasal dari aktifitas volkanik bersifat asam-intermediet pada umur Oligo-Miosen di sebelah Barat Laut. Tiga sampel batuan pada recycled orogen berada pada fase pengenggelaman maksimum (maksimum flooding) dan kandungan mineral olivine yang hanya dijumpai 2 sampel diantara ketiganya menunjukkan adanya sumber batuan yang berasal dari volkanik yang bersifat basa/ultrabasa, atau bisa diinterpretasikan bahwa terdapat tinggian lain (paleo high) di sebelah Utara (daerah Bayat-Klaten/sejenisnya) yang berkontribusi mensuplai material sedimen ke Cekungan Wonosari. Evolusi magmatic arc sejak Eosen, dapat dibagi menjadi 3 tahapan, yaitu: 1) Eosen Island Arc; 2) Oligo-Miosen Volcanic Arc; dan 3) Quarternary Volcanic Arc.
Co-Authors Akhmad Sofyan Bambang Yudho Suranta Irfan Rasyid