Pemodelan deposisi wax pada pipa minyak bawah laut dan strategi mitigasinya = Wax deposition modeling in subsea oil pipeline and its mitigation strategy
Yanri Noer Thaher;
Kamarza Mulia, supervisor; Misri Gozan, examiner; Praswasti Pembangun Dyah Kencana Wulan, examiner; Setiadi, examiner
(Fakultas Teknik Universitas Indonesia, 2014)
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[ABSTRAK Minyak mentah yang memiliki kandungan wax tinggi dapat menyebabkantimbulnya permasalahan selama proses transportasi berlangsung. Jika titik awalpembentukan deposisi dapat diprediksi dengan baik dan laju pengendapan dapatdihitung secara akurat maka strategi penanganannya akan tepat sasaran.Dalam penelitian ini, pembentukan deposisi wax diprediksi dengan menggunakansimulasi OLGA. Uji laboratorium atas sampel dari sumur Bravo dilakukanterlebih dahulu untuk mengetahui komposisi fluida, nilai WAT, jumlah fraksi waxdan viskositas. Karakterisasi dan tuning dilakukan dengan bantuan perangkatlunak PVTsim menggunakan hasil pengujian laboratorium. Hasil karakterisasi iniselanjutnya digunakan sebagai input bagi OLGA untuk memprediksi titik awaldeposisi serta menghitung laju pengendapannya. Simulasi dilakukan pada lajualir 80000 bpd pada beberapa periode waktu. Kemudian dilakukan juga beberapavariasi laju alir untuk melihat pengaruhnya terhadap titik awal deposisi wax sertatingkat ketebalannya.Untuk kasus lapangan Charlie-Bravo dengan laju alir 80000 bpd, titik awaldeposisi wax terbentuk pada jarak 4 km pada temperatur 31,1 oC. Lajupengendapan akan terus meningkat seiring berjalannya waktu dan akan mencapaiketebalan 1 mm pada jarak 6,87 km setelah 82 hari. Rekomendasi untukmelakukan pigging dikeluarkan apabila ketebalan wax pada dinding pipamencapai 1 mm agar peningkatan laju pengendapan dapat dikurangi. ABSTRACT The presence of wax in crude oil can lead to the formation of wax deposit on thewall of pipelines. If we can predict the starting point for the formation of waxdeposition and calculate the rate accurately then the appropriate mitigation can bewell developed.In this study, the wax deposition was predicted using OLGA simulation.Laboratory test from Bravo wells to determine the fluid composition, WAT,amount of wax fraction and viscosity shall be done first. This laboratory test resultwas then characterized and tuned using the PVTsim. The result was used as aninput for OLGA to calculate the rate of wax deposition in pipelines. Simulationwas conducted at a flow rate of 80000 bpd with the time of 1-60 days. The samething was also done at several flow rates to see the effect of wax formation and itslevel of thickness.In the case of Charlie-Bravo field that produce 80000 bpd of liquid, wax began toprecipitate at a distance of 4 km and temperature 31.1 oC. The deposition rate willcontinue to increase over the time and will get a thickness of 1 mm at the distanceof 6.87 km after flowing for about 82 days Pigging is recommended if the waxthickness in the pipe achieves 1 mm. This is as a preventive maintenance toreduce an escalation of rate deposition.;The presence of wax in crude oil can lead to the formation of wax deposit on thewall of pipelines. If we can predict the starting point for the formation of waxdeposition and calculate the rate accurately then the appropriate mitigation can bewell developed.In this study, the wax deposition was predicted using OLGA simulation.Laboratory test from Bravo wells to determine the fluid composition, WAT,amount of wax fraction and viscosity shall be done first. This laboratory test resultwas then characterized and tuned using the PVTsim. The result was used as aninput for OLGA to calculate the rate of wax deposition in pipelines. Simulationwas conducted at a flow rate of 80000 bpd with the time of 1-60 days. The samething was also done at several flow rates to see the effect of wax formation and itslevel of thickness.In the case of Charlie-Bravo field that produce 80000 bpd of liquid, wax began toprecipitate at a distance of 4 km and temperature 31.1 oC. The deposition rate willcontinue to increase over the time and will get a thickness of 1 mm at the distanceof 6.87 km after flowing for about 82 days Pigging is recommended if the waxthickness in the pipe achieves 1 mm. This is as a preventive maintenance toreduce an escalation of rate deposition., The presence of wax in crude oil can lead to the formation of wax deposit on thewall of pipelines. If we can predict the starting point for the formation of waxdeposition and calculate the rate accurately then the appropriate mitigation can bewell developed.In this study, the wax deposition was predicted using OLGA simulation.Laboratory test from Bravo wells to determine the fluid composition, WAT,amount of wax fraction and viscosity shall be done first. This laboratory test resultwas then characterized and tuned using the PVTsim. The result was used as aninput for OLGA to calculate the rate of wax deposition in pipelines. Simulationwas conducted at a flow rate of 80000 bpd with the time of 1-60 days. The samething was also done at several flow rates to see the effect of wax formation and itslevel of thickness.In the case of Charlie-Bravo field that produce 80000 bpd of liquid, wax began toprecipitate at a distance of 4 km and temperature 31.1 oC. The deposition rate willcontinue to increase over the time and will get a thickness of 1 mm at the distanceof 6.87 km after flowing for about 82 days Pigging is recommended if the waxthickness in the pipe achieves 1 mm. This is as a preventive maintenance toreduce an escalation of rate deposition.] |
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No. Panggil : | T41784 |
Entri utama-Nama orang : | |
Entri tambahan-Nama orang : | |
Entri tambahan-Nama badan : | |
Subjek : | |
Penerbitan : | Depok: Fakultas Teknik Universitas Indonesia, 2014 |
Program Studi : |
Bahasa : | ind |
Sumber Pengatalogan : | LibUI ind rda |
Tipe Konten : | text |
Tipe Media : | unmediated ; computer |
Tipe Carrier : | volume ; online resource |
Deskripsi Fisik : | xv, 86 pages : illustration ; 30 cm + appendix |
Naskah Ringkas : | |
Lembaga Pemilik : | Universitas Indonesia |
Lokasi : | Perpustakaan UI, lantai 3 |
No. Panggil | No. Barkod | Ketersediaan |
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T41784 | 15-17-581096685 | TERSEDIA |
Ulasan: |
Tidak ada ulasan pada koleksi ini: 20389255 |