Studi Perancangan Outfall Limbah Pengeboran MIGAS di Selat Makassar

Muzhaffar, Fadrian Athaya (2023) Studi Perancangan Outfall Limbah Pengeboran MIGAS di Selat Makassar. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan Water Based Drilling Mud (WBM) merupakan bagian penting dari eksploitasi minyak dan gas yang berfungsi untuk melumasi mata bor, menjaga stabilitas sumur, dan juga mengangkut cutting atau pecahan batuan yang di bor dari dalam lubang sumur selama proses pengeboran. Pada operasi pengeboran lepas pantai, salah satu metode pembuangan dari WBM yang dapat digunakan ialah penggunaan sistem outfall untuk membuang WBM ke perairan. Dalam penelitian ini, dilakukan pemodelan numerik juga analisis kesesuaian regulasi terhadap outfall yang digunakan untuk membuang limbah WBM pada pengeboran sumur migas Merakes East-1. Untuk desain awal yang dievaluasi, port pembuangan memiliki kedalaman 10-m dimana didapatkan konsentrasi akhir TSS sebesar 11,04 mg/l untuk kondisi arus maksimum dan 19,34 mg/l untuk arus minimum pada jarak 500 m. Setelah itu, penelitian ini melakukan pemodelan terhadap variasi kedalaman port 5 m, 8 m, dan 15 m untuk mengetahui apakah penambahan maupun pengurangan kedalaman port dapat mempengaruhi dilusi secara signifikan untuk perairan laut dalam seperti pada Merakes East-1. Didapatkan bahwa nilai konsentrasi terkecil yang menandakan dilusi terbesar ada pada Port 5 m dengan nilai 11,03 mg/l dan 19,33 mg/l untuk arus maksimum dan minimum, sementara konsentrasi terbesar yang menandakan dilusi terkecil dimiliki oleh Port 15 m dengan nilai 11,04 mg/l dan 19,34 mg/l untuk arus maksimum dan minimum. Nilai perbedaan yang tidak signifikan diakibatkan oleh tidak adanya batasan penghambat seperti dasar laut maupun stratifikasi densitas perairan pada aliran plume sehingga memungkinkan seluruh variasi port untuk mengalami proses juga waktu dilusi yang serupa. Dimana semua jenis variasi kedalaman telah memenuhi standar baku mutu berdasarkan regulasi yang berlaku. Oleh karena itu, penggunaan outfall dengan kedalaman yang lebih dangkal dapat dipertimbangkan untuk mengurangi biaya konstruksi outfall.
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The use of Water Based Drilling Mud (WBM) is an important part of oil and gas exploitation, serving to lubricate the drill bit, maintain well stability, and transport cuttings or rock fragments drilled from the wellbore during the drilling process. In offshore drilling operations, one of the methods for disposing of WBM is through the use of an outfall system to discharge it into the water. In this study, numerical modeling and regulatory compliance analysis were conducted on the outfall used for the disposal of WBM waste in the drilling of the Merakes East-1 oil well.For the evaluated initial design, the discharge port had a depth of 10 meters, resulting in a final Total Suspended Solids (TSS) concentration of 11.04 mg/l for maximum flow conditions and 19.34 mg/l for minimum flow conditions at a distance of 500 meters. Subsequently, this study conducted modeling of variations in port depths of 5 meters, 8 meters, and 15 meters to determine whether increasing or decreasing the port depth could significantly affect dilution in deep-sea environments such as in Merakes East-1. It was found that the lowest concentration indicating the highest dilution was achieved with a 5-meter port, with values of 11.03 mg/l and 19.33 mg/l for maximum and minimum flow conditions, respectively. On the other hand, the highest concentration indicating the lowest dilution was obtained with a 15-meter port, with values of 11.04 mg/l and 19.34 mg/l for maximum and minimum flow conditions. The insignificant differences in values were due to the absence of constraining factors such as the seafloor or density stratification in the plume flow, allowing all port depth variations to experience similar dilution processes and times. All depth variations met the quality standards based on applicable regulations. Therefore, the use of shallower outfall depths can be considered to reduce outfall construction costs.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	outfall , water- based drilling mud, pengeboran, drilling
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TD Environmental technology. Sanitary engineering > TD898.8.C67 Waste disposal T Technology > TD Environmental technology. Sanitary engineering > TD899 Waste control in special industries, plants, processes, etc T Technology > TN Mining engineering. Metallurgy > TN871.3 Offshore well drilling
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Fadrian Athaya Muzhaffar
Date Deposited:	24 Jul 2023 02:09
Last Modified:	24 Jul 2023 02:09
URI:	http://repository.its.ac.id/id/eprint/98680

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