Optimasi Biaya Proses Abandonment and Site Restoration (ASR) dari Oil Offshore Platform

Latifa, Safrida Nur (2025) Optimasi Biaya Proses Abandonment and Site Restoration (ASR) dari Oil Offshore Platform. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Seiring berakhirnya operasi anjungan lepas pantai, perlu dilakukan Abandonment and Site Restoration (ASR), yaitu rangkaian kegiatan pasca operasi yang mencakup penutupan sumur permanen dan restorasi lingkungan. ASR penting bukan hanya untuk menjaga lingkungan, tetapi juga demi keselamatan navigasi, karena platform yang tidak beroperasi dapat membahayakan pelayaran. Proses ini kompleks, memakan waktu, dan membutuhkan biaya besar. ASR bersifat wajib tanpa memberikan keuntungan langsung, efisiensi dan optimasi biaya menjadi hal yang sangat penting. Penelitian ini bertujuan untuk membandingkan estimasi biaya lima alternatif metode ASR yaitu Complete Removal, Partial Removal, Rig to Reef In-Situ, Rig to Reef Ex-Situ, dan Rig to Military Base. Data yang digunakan berupa durasi kegiatan dan harga komponen. Metodologi dilakukan melalui studi literatur, pemodelan 3D struktur platform, penyusunan skenario proses ASR, dan pengolahan data menggunakan pendekatan Work Breakdown Structure (WBS) dan Cost Breakdown Structure (CBS). WBS disusun berdasarkan Form PTK-040/SKKIA0000/2023/S9 Revisi 02 yang memuat komponen biaya ASR, sedangkan CBS menguraikan satuan biaya, durasi pekerjaan, peralatan, dan SDM. Analisis biaya dan durasi menunjukkan bahwa metode Complete Removal membutuhkan biaya tertinggi sebesar $28.040.488 dengan durasi pelaksanaan selama 343 hari, dan dijadikan sebagai base case pembanding. Dibandingkan metode ini, Partial Removal memerlukan 328 hari dan memberikan penghematan biaya sebesar $1.603.324 atau sekitar 5,72%, menunjukkan bahwa pengurangan bagian struktur yang dibongkar dapat langsung menurunkan biaya dan sedikit mempercepat durasi. Rig to Reef In-Situ, yang memanfaatkan anjungan sebagai terumbu buatan di lokasi aslinya, memiliki efisiensi lebih tinggi dengan durasi 311 hari dan penghematan biaya sebesar $3.222.923 atau 11,50% dari base case. Sementara itu, Rig to Reef Ex-Situ berdurasi 335 hari dan biayanya hampir sama dengan Complete Removal, dengan selisih hanya $107.943 atau sekitar 0,39% lebih murah karena adanya proses tambahan untuk memindahkan struktur ke lokasi baru. Metode paling ekonomis adalah Rig to Military Base, dengan total biaya $19.620.166 dan durasi tercepat 269 hari, memberikan penghematan sebesar $8.420.322 atau sekitar 30,03% dibandingkan base case
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As offshore platform operations come to an end, it becomes mandatory to carry out Abandonment and Site Restoration (ASR), a series of post-operation activities that include permanent well plugging and environmental restoration. ASR is essential not only to protect the environment but also to ensure navigational safety, as non-operating platforms can pose hazards to marine traffic. This process is complex, time-consuming, and costly. Since ASR is mandatory and does not generate direct financial returns, cost efficiency and optimization are important. This study aims to compare the estimated costs of five alternative ASR methods: Complete Removal, Partial Removal, Rig to Reef In-Situ, Rig to Reef Ex-Situ, and Rig to Military Base. The data used includes activity durations and component costs. The methodology involves literature review, 3D modelling of the platform structure, development of ASR process scenarios, and data processing using the Work Breakdown Structure (WBS) and Cost Breakdown Structure (CBS) approaches. The WBS is developed based on Form PTK-040/SKKIA0000/2023/S9 Revision 02, which outlines the components of ASR costs, while the CBS details unit costs, work durations, equipment, and labour. Cost and duration analysis shows that the Complete Removal method requires the highest cost at $28,040,488 with an implementation duration of 343 days and is used as the base case for comparison. Compared to this method, Partial Removal takes 328 days and offers a cost saving of $1,603,324 or approximately 5.72%, indicating that reducing the amount of structure removed can directly lower expenses and slightly reduce the duration. The Rig to Reef In-Situ method, which repurposes the platform as an artificial reef at its original location, has higher efficiency with a duration of 311 days and a cost saving of $3,222,923 or 11.50% from the base case. Meanwhile, the Rig to Reef Ex-Situ method has a duration of 335 days and costs nearly as much as Complete Removal, at $107,943 or only 0.39% less, due to the additional process of relocating the structure to a new site. The most economical method is Rig to Military Base, with a total cost of $19,620,166 and the shortest duration of 269 days, resulting in a cost saving of $8,420,322 or approximately 30.03%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ASR, CBS, Optimasi, Platform, Restorasi, ASR, CBS, Optimization, Platform, Restoration
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Safrida Nur Latifa
Date Deposited:	05 Aug 2025 07:12
Last Modified:	05 Aug 2025 07:12
URI:	http://repository.its.ac.id/id/eprint/127505

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