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All Journal Scientific Contributions Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI (LPMGB)
Usman Pasarai
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Chemical Engineering, Chemistry & Bioengineering Energy

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PRACTICAL METHOD FOR ASSESSING RESERVOIR PERFORMANCE TO REVIVE CLOSED OIL WELLS Usman Pasarai
Scientific Contributions Oil and Gas Vol 37 No 3 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.3.637

Abstract

Efficiency is the key issue in reinstating of closed oil wells to production. The goal of this work is to develop practical workÀow for assessing reservoir performance to revive closed wells. The workÀow are generating the set of criteria, valuing the criteria, and making a ranked list of wells to be revived. Application to an offshore oil field, which under consideration to start producing again shown that the results are found to be reliable and consistent with the historical production performance. From the nine wells assessed, found that Well 3 and Well 7 are not recommended to be revived due to low remaining reserves and less predicted additional recoverable oil. The proposed methodology focus on petrophysical and production performance analysis associated with the wells probed rather than integrating static-dynamic reservoir data, well data, and operational issues as the commonly used one.,. Application of this methodology are expected to be beneficial to companies involved in field operations because the cost associated with the time spent for these types of processes could be reduced considerably.
A SYSTEMATIC APPROACH TO SOURCE-SINK MATCHING FOR CO2 EOR AND SEQUESTRATION Usman Pasarai; Utomo Pratama Iskandar; Sugihardjo Sugihardjo; Herru Lastiadi S
Scientific Contributions Oil and Gas Vol 36 No 1 (2013)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.36.1.640

Abstract

Carbon dioxide for enhanced oil recovery (CO2 EOR) can magnify oil production substantially while aconsistent amount of the CO2 injected remains sequestrated in the reservoir, which is benefi cial for reducingthe greenhouse gas (GHG) emission. The success of CO2 EOR sequestration depends on the proper sourcessinksintegration. This paper presents a systematic approach to pairing the CO2 captured from industrialactivities with oil reservoirs in South Sumatra basin for pilot project. Inventories of CO2 sources and oilreservoirs were done through survey and data questionnaires. The process of sources-sinks matching waspreceded by scoring and ranking of sources and sinks using criteria specifi cally developed for CO2 EORand sequestration. The top candidate of CO2 sources are matched to several best sinks that correspond toadded value, timing, injectivity, containment, and proximity. Two possible scenarios emerge for the initialpilot where the CO2 will be supplied from the gas gathering station (GGS) while the H3 and F21 oil fi eldsas the sinks. The pilot is intended to facilitate further commercial deployment of CO2 EOR sequestrationin the South Sumatera basin that was confi rmed has abundant EOR and storage sinks as well as industrialCO2 sources.
Worksheet Screening Of Co2 Eor Sequestration Potential In Indonesia Usman Pasarai; Utomo Pratama I; Danang Sismartono
Scientific Contributions Oil and Gas Vol 33 No 1 (2010)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.33.1.806

Abstract

CO2 injection into subsurface with the purpose to increase incremental oil production had been popularized in 1970s in US. Nowadays, this type of EOR methods not only offers more oil but also utilizing reservoir as CO2 storage in the context of CO2 emission abatement. The objective of this research is to produce simple and efficient worksheet on EXCEL base in order to asses and screen out quickly the potential of implementation of CO2 EOR sequestration in depleted oil fields in Indonesia.Key elements of this worksheet comprise engineering aspect and economical aspect. A sequence workflow of technical performance of CO2 flooding was done using streamline simulator in which outstanding output from simulator needs robust data preparation and cautious parameter set up. For the case studied here, total incremental oil recovery at the end of the project is 4.52% from original oil in place (IOIP) or about 6.23 MMSTB. “Prophet” was used to simulate CO2 sequestration during CO2 EOR incorporating residual trapping. The amount of CO2 trapped in reservoir was acquired by subtracting the total injected CO2 with CO2 produced. The total capital expenditure for sequestration CO2 EOR studied here is estimated $48.3 MM. It is expected that $16.5 MM will be placed in service by 1st year with the remaining $31.7 MM to be placed in service by 2nd year. Annual average operating cost was estimated to be $5.4 MM. As for fiscal terms, the following assumptions have been incorporated into the economic evaluations: (1) FTP 10%, (2) Investment Credit 17%, (3) Contractor Oil Split 26.6018%, (4) Government Split 73.3982%, and (5) Tax 44%. The economic analyses were carried out based on the project life time 7 years and the sales of incremental oil amount 5.6 MMSTB with an assumption that price for oil was $68 per barrel based on monthly average OPEC Basket Price during April-09 until March-10. Economic results of the development with discount factor 7 percent as indicated has a Contractor DCF Rate of Return 53.3 percent, Contractor Net Present Value $31.3 MM, and revenue to the Government of Indonesia $188.2 MM. With this economic indicator, the project of Sequestration CO2 EOR is economically feasible. The developed worksheet enables to do quick judgment on the viability a CO2 EOR sequestration project hence make it easier to someone who wants to screen out a large number of reservoirs rather than using detailed numerical simulator. It will much more saved time and decrease works intensity.
Understanding Carbon Capture And Storage (Ccs) Potential In Indonesia Ego Syahrial; Usman Pasarai; Utomo P Iskandar
Scientific Contributions Oil and Gas Vol 33 No 2 (2010)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.33.2.816

Abstract

National energy policy drawn up by the government through Energy Mix Target 2025 (Presidential Regulation No.5/2006) is still dominated by fossil fuel. Moreover, it is coupled with high dependence on fossil fuel, increasing demand of energy and standard of living and high rate population growth, it can turn Indonesia into one of the biggest emitter in the future. On 2009, the government has pledged a non-binding commitment to reduce country emissions by 26% in 2020. This aspiring target requires great efforts besides reliying on current strategies such as energy mix improvements, the switch to less-carbon intensive fuels and renewable resources deployment as well as conservation. Carbon Capture and Storage (CCS) is one of the climate change mitigation tools with the technological capability to reduce CO2 in substantial amount and deep cut particularly on energy sector. CCS is typically defined as the integrated process of CO2 separation at industrial plants, transportation to storage sites and injection into subsurface formations. This paper explains the possibility of CCS potential deployment in Indonesia by reviewing required components and provides comprehensive understanding in each CCS key lements.
Pengembangan Simulator Reservoir untuk Evaluasi Perolehan Minyak dengan Teknologi EOR Usman Pasarai
Lembaran publikasi minyak dan gas bumi Vol 44 No 2 (2010)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.44.2.599

Abstract

Enhanced Oil Recovery (EOR) adalah suatu teknik peningkatan produksi minyak denganmenginjeksikan fluida ke dalam reservoir untuk mendesak minyak yang masih tersisa ke sumursumurproduksi. Prediksi respon reservoir terhadap aplikasi suatu teknologi EOR sangat diperlukansebelum proyek dimulai untuk estimasi keekonomian proyek. Simulasi reservoir adalah carayang paling efektif dan efisien untuk keperluan prediksi tersebut. Perangkat lunak yang digunakandisebut simulator reservoir.Model matematik pendesakan minyak dengan teknologi EOR umumnya diselesaikan denganmetode fully implicit finite difference pada setiap grid blok. Kelemahan utama metode iniadalah waktu komputasi yang lama. Metode sequential streamline dapat menjadi alternatifterhadap fully implicit finite difference khususnya bila heterogenitas reservoir dan mobilitasfluida merupakan faktor dominan dalam mekanisme pendesakan. Tulisan ini menggambarkanpengembangan streamline simulator untuk thermal EOR. Validasi simulator yang dikembangkandilakukan dengan membandingkan hasil simulasi pendesakan minyak dengan air panas dengantermal simulator komersial. Hasilnya menunjukkan bahwa simulator yang dikembangkan lebihefisien dibandingkan termal simulator komersial.
Pengembangan dan Aplikasi Simulator Reservoir Untuk Simulasi Perkolasi Gas pada Reservoir Bertenaga Dorong Gas Terlarut Usman Pasarai
Lembaran publikasi minyak dan gas bumi Vol 44 No 3 (2010)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.44.3.602

Abstract

Pada tahap awal deplesi reservoir akan terjadi penurunan tekanan di bagian bawah kolomminyak secara progresf hingga lebih rendah dari tekanan titik didih. Jika produksi terus berlanjutakan menghasilkan evolusi gas terlarut sepanjang kolom minyak. Gas ini kemudian menerobosmenuju bagian atas reservoir karena perbedaan densitas minyak dan gas. Fenomena ini dikenalsebagai perkolasi gas. Dengan viskositas gas yang rendah, laju alir perkolasi gas ini ke kolom atasakan menjadi sangat besar. Perkolasi gas pada finite difference simulasi reservoir bertenagadorong gas terlarut dengan sejumlah grid arah vertikal dapat menyebabkan hasil perhitungannumerik saturasi gas negatif diakhir time step. Hal ini disebabkan karena gas yang keluar darigrid tersebut lebih besar dari akumulasi gas yang ada dalam grid.Dalam penelitian ini telah dikembangkan simulator reservoir untuk simulasi perkolasi gaspada reservoir bertenaga dorong gas terlarut. Validasi simulator yang dikembangkan dilakukandengan membandingkan hasil simulasi reservoir homogen dua fasa minyak dan gas pada sistemtiga dimensi. Stabilitas numerik simulator yang dikembangkan telah diuji dengan melakukanbeberapa simulasi untuk investigasi pengaruh laju aliran produksi minyak terhadap perbandinganproduksi gas dan minyak.
Potensi Pengembangan EOR untuk Peningkatan Produksi Minyak Indonesia Usman Pasarai
Lembaran publikasi minyak dan gas bumi Vol 45 No 2 (2011)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.45.2.687

Abstract

Basis data cadangan minyak dan gas bumi yang dikelola LEMIGAS menunjukkan bahwasekitar 62% dari isi awal minyak ditempat masih tertinggal dalam reservoar setelah pengurasanprimer dan sekunder. Jumlah terbesar dari potensi enhanced oil recovery (EOR) tersebut beradadi wilayah Sumatera Tengan dan Selatan. Dominan dari potensi ini merupakan kandidat aplikasiEOR injeksi kimia dan CO2. Sebagian kecil saja dari minyak ini dapat diproduksi akan memberikontribusi yang berarti dalam meningkatkan produksi minyak Indonesia di masa mendatang.Implementasi EOR adalah proses yang kompleks dan setiap reservoar memerlukan spesifikoperasi dan fluida injeksi. Oleh karena itu, proses evaluasi dan pengembangan proyek EORperlu dilakukan sistimatis dan bertahap dari seleksi, evaluasi, uji coba hingga tahap aplikasi dilapangan. Berbagai inovasi teknologi telah dikembangkan untuk menghasilkan perbaikan dalamproses EOR. Paper ini menguraikan potensi EOR Indonesia serta sebarannya dan bidang riset yangperlu dikembangkan LEMIGAS untuk mendukung aplikasi EOR secara komersial di Indonesia.Sepintas deskripsi mengenai teknologi EOR juga disertakan dalam paper ini.
Co-Authors Anda Lucia Bambang Widarsono Danang Sismartono Ego Syahrial Endras Pribadi Hazman Herru Lastiadi S Sugihardjo Sugihardjo Utomo P Iskandar Utomo Pratama I Utomo Pratama Iskandar