Abstract
The Gas Gathering Station (GGS) in field X processes gas from 16 (sixteen) wells before being sent as selling gas to consumers. The sixteen wells have decreased in good pressure since 2011, thus affecting the performance of the Acid Gas Removal Unit (AGRU). The GGS consists of 4 (four) main units, namely the Manifold Production/ Test, the Separation Unit, the Acid Gas Removal Unit (AGRU), the Dehydration Unit (DHU). The AGRU facility in field X is designed to reduce the acid gas content of CO2 by 21 mol% with a feed gas capacity of 85 MMSCFD. A decrease in reservoir pressure caused an increase in the feed gas temperature and an increase in the water content of the well. Based on the reconstruction of the design conditions into the simulation model, the amine composition consisting of MDEA 0.3618 and MEA 0.088 wt fraction to obtain the percentage of CO2 in the 5% mol sales gas. The increase in feed gas temperature up to 146 F caused foaming due to condensation of heavy hydrocarbon fraction, so it was necessary to modify it by adding a chiller to cool the feed gas to become 60 F. Based on the simulation, the flow rate of gas entering AGRU could reach 83.7 MMSCFD. There was an increase in gas production of 38.1 MMSCFD and condensate of 1,376 BPD. Economically, the addition of a chiller modification project was feasible with the economical parameters of NPV US$ 132,000,000, IRR 348.19%, POT 0.31 year and PV ratio 19.06.
Highlights
The Gas Gathering Station (GGS) in field X processes gas from 16 wells before being sent as selling gas to consumers
The sixteen wells have decreased in good pressure
A decrease in reservoir pressure caused an increase in the feed gas temperature
Summary
Pada Lapangan X terdapat fasilitas Stasiun Pengumpul Gas (SPG) yang mengolah gas dari 16 (enam belas) sumur produksi dengan kapasitas gas umpan sebesar 85 MMSCFD pada suhu gas pada separator 105 F dan tekanan 800 psig dengan kandungan gas CO2 21% mol. Fluida dari sumur menuju manifold dan dipisahkan cairannya pada HP Separator yang beroperasi pada tekanan 775 psig dan suhu 91 F, selanjutnya menuju HP Scrubber sebelum menuju ke AGRU. Kondisi aktual dengan semakin lama berproduksi, reservoir akan mengalami penurunan tekanan reservoir/tubing, dan peningkatan produksi air yang menyebabkan kenaikan suhu pada gas umpan yang. Kondensasi fraksi berat dari gas umpan mempunyai suhu yang lebih panas dari pada larutan amine yang masuk dapat menyebabkan Foaming yang akan berkibat pada losses amine dan shutdown plant. MDEA tidak mudah terdegradasi baik panas maupun kimia dan mempunyai panas reaksi dengan H2S yang rendah. (Maddox et al, 1998) menyarankan bahwa MDEA dapat digunakan sebagai non selektif larutan untuk menghilangkan H2S dan CO2, atau dapat digunakan sebagai selektif pelarut yang mana akan menghilangkan H2S daripada CO2. (Maddox et al, 1998) menyatakan bahwa selektifitas MDEA dipengaruhi oleh: 1. Suhu : suhu yang lebih rendah akan meningkatkan selektifitas
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