Usulan Peningkatan Produksi Melalui Metode Enhance Oil Recovery (EOR) Menggunakan Surfactant pada Bahan Operasi Bersama (BOB) PT Bumi Siak Pusako - Pertamina Hulu

Medi Apriandi, Dr. Ir. Adi Djoko Guritno, MSIE.

2013 | Tesis | S2 Magister Manajemen

BOB PT Bumi Siak Pusako – Pertamina Hulu merupakan salah satu Kontraktor Kontrak Kerjasama (KKKS) dibawah pembinaan BPMIGAS yang telah melakukan upaya untuk menahan laju penurunan produksi atau meningkatkan produksi. Upaya tersebut melalui primary maupun secondary recovery dan saat ini merencanakan pelaksanaan tertiary recovery atau yang dikenal dengan Enhanced Oil Recovery (EOR) di salah satu lapangannya yaitu Pedada. Analisa yang digunakan dalam penerapan EOR adalah analisa teknis dan keekonomian. Analisa teknis meliputi analisa terhadap karakteristik reservoir dan kandungan fluida; potensi cadangan yang tersedia, pemilihan metode EOR yang sesuai (EOR screening) dan potensi tambahan produksi yang dapat diperoleh. Analisa keekonomian meliputi analisa terhadap beberapa parameter yaitu Net Present Value (NPV), Rate of Return (ROR)/Internal Rate of Return (IRR), Pay Out Time (POT) dan Profit to Investment Ratio (PIR) atau Discounted Profit to Investment Ratio (DPI). Hasil analisa teknik, karakteristik batuan dan fluida reservoir lapangan pedada pada lapisan lapisan 550 feet yaitu gravity 30 API, viskositas 5,575 cp, porositas 26,875%, saturasi minyak 70,625%, permeabilitas 490 mD, dan 171.25 0F. Besarnya cadangan/Original Oil Place (OOIP) pada lapisan tersebut sebesar 101,17 MMSTB dan cadangan pada EOR pattern sebesar 72.26 MMSTB. Potensi minyak yang dapat diproduksikan dari EOR pattern sebesar 5,78 MMSTB. Dari data teknis tersebut, metode EOR yang sesuai (EOR screening) berdasarkan literatur adalah injeksi surfactant. Kajian keekonomian bagian kontraktor berdasarkan perhitungan bagi hasil antara Pemerintah dengan Kontraktor didapatkan NCF US$ 44.482.000, NPV US$ 23.117.000, IRR 85%, POT 2,2 tahun dan DPI 2.31 (asumsi harga minyak sebesar US$ 100/bbl, biaya operasi US$ 24/bbl dan perkiraan produksi 100%). Untuk mendapatkan kajian yang lebih optimal digunakan analisa sensitivitis parameter keekonomian tersebut terhadap harga minyak (±10%), perkiraan produksi (±10%), dan biaya operasi (± US$ 1/bbl). Dari hasil kajian teknis dan keekonomian beserta sensitivitasnya dapat disimpulkan bahwa EOR tersebut layak dipertimbangkan untuk dilaksanakan.

BOB PT Bumi Siak Pusako - Pertamina Hulu is one of the Contractors Cooperation Contract that runs it operation under the guidance of BPMIGAS, the organization that eligible to stem production decline or boost production increase. These efforts through primary and secondary recovery, and are currently in planning phase of the tertiary recovery implementation, known as Enhanced Oil Recovery (EOR) in the Pedada Field, is one of BOB field. Analyzes being used in the application of EOR are both technical and economic analysis. Technical part includes an analysis of the characteristics of the reservoir and fluid content; potential reserves available, the selection of appropriate methods of EOR screening and the additional potential production obtainable. Economic part includes an analysis of multiple parameters, namely the Net Present Value (NPV), Rate of Return (ROR) / Internal Rate of Return (IRR), Pay Out Time (POT) and Profit to Investment Ratio (PIR) or Discounted Profit to Investment Ratio (DPI). Results of thoses analysis techniques, the characteristics of the reservoir rock and fluid in the 550 feet layer of Pedada field are gravity at 30 API, viscosity at 5.575 cp, porosity at 26.875 %, oil saturation at 70.625%, permeability at 490 mD, and temperature at 171.25 0F. The amount of reserves / Original Oil Place (OOIP) available in the layer was 101.17 MMSTB and reserves the EOR pattern was 72.26 MMSTB. The potential of oil that can be produced from the EOR pattern is 5.78 MMSTB. From the technical data, the appropriate method of EOR (EOR screening) based on the literature is surfactant injection. Economic studies for contractor section based on the calculation of profit sharing between the Government and the Contractor earned are US$44,482,000 for NCF, US$ 23,117,000 for NPV, 85% for IRR, 2.2 years POT and 2.31 DPI (assuming oil price of US$ 100/bbl, US$ 24/bbl operating cost and production estimation of 100%). In Order to get a more optimal study, we may use analysis of economic parameters such as sensitivity to oil prices (± 10%), production estimates (± 10%) and operating costs (± U.S. $ 1/bbl). From the results of the technical and economic assessment and its sensitivity, it can be concluded that the EOR is worth considering for implementation.

Kata Kunci : karakteristik reservoir, EOR screening, injeksi surfactant, NCF, NPV, IRR, POT, DPI