Analisis Dinamika Fluida Alat Pembersih Lubang Untuk Pengangkatan Serbuk Bor Pada Sumur Bor Lepas Pantai Dengan Pendekatan Two-Way Coupling CFD-DEM

Firmansyah, M. Farras Rheza (2026) Analisis Dinamika Fluida Alat Pembersih Lubang Untuk Pengangkatan Serbuk Bor Pada Sumur Bor Lepas Pantai Dengan Pendekatan Two-Way Coupling CFD-DEM. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Operasi pengeboran sumur berarah dan lepas pantai sering kali menghadapi kendala serius berupa akumulasi serbuk bor di dalam ruang anulus, yang berpotensi memicu insiden pipa terjepit. Penelitian ini bertujuan untuk mengevaluasi efektivitas alat mekanis Cuttings Bed Remover (CBR) berdesain bilah heliks dalam meningkatkan kinerja pengangkatan serbuk bor. Simulasi numerik 3D dilakukan menggunakan pendekatan Two-Way Coupling Computational Fluid Dynamics - Discrete Element Method (CFD-DEM). Fase fluida berupa lumpur pengeboran dimodelkan sebagai ruang berkesinambungan melalui pendekatan Eulerian (CFD), sedangkan partikel serbuk bor berukuran 3-5 mm dilacak secara terpisah menggunakan pendekatan Lagrangian (DEM). Skenario simulasi mengondisikan tumpukan awal endapan setinggi 1/3 dari celah anulus untuk merepresentasikan kondisi kritis. Hasil simulasi menunjukkan bahwa titik operasional paling optimal dicapai pada kombinasi putaran 80 RPM dan laju aliran 400 GPM. Pada kondisi konsentrik, kombinasi ini menghasilkan kecepatan tangensial sebesar 0,36 m/s dengan beban pressure drop yang aman di angka 1.556 Pa. Validasi lanjutan pada kondisi eksentrik kritis 0,8 membuktikan bahwa CBR sukses mendispersi endapan di area celah sempit. Meskipun eksentrisitas menurunkan kecepatan tangensial menjadi 0,17 m/s akibat redaman dinding, nilai rata-rata pressure drop justru menurun ke angka 1.143 Pa karena mayoritas fluida melewati celah yang lebih luas. Penelitian ini menyimpulkan bahwa penerapan CBR dengan parameter operasional tersebut efektif untuk mengoptimalkan pembersihan lubang sumur tanpa membahayakan integritas pompa sirkulasi.
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Directional and offshore drilling operations frequently encounter severe challenges due to the accumulation of drill cuttings within the annular space, which can potentially lead to stuck pipe incidents. This study aims to evaluate the effectiveness of a mechanical Cuttings Bed Remover (CBR) equipped with a helical blade in enhancing cuttings transport performance. 3D numerical simulations were conducted utilizing a Two-Way Coupled Computational Fluid Dynamics - Discrete Element Method (CFD-DEM) approach. The fluid phase, representing the drilling mud, was modeled as a continuous domain via the Eulerian framework (CFD), while the 3-5 mm drill cuttings particles were individually tracked using the Lagrangian approach (DEM). The simulation scenario involved a pre-placed bed occupying 1/3 of the annular clearance to represent a critical condition. Simulation results indicated that the most optimal operational point was achieved at a combination of 80 RPM and a flow rate of 400 GPM. Under concentric conditions, this combination generated a tangential velocity of 0.36 m/s with a safe pressure drop load of 1,556 Pa. Further validation under critical eccentric conditions 0.8 proved that the CBR successfully dispersed the bed in the narrow gap area. Although eccentricity reduced the tangential velocity to 0.17 m/s due to wall dampening, the average pressure drop decreased to 1,143 Pa as the majority of the fluid bypassed through the wide gap. This study concludes that the application of CBR with these operational parameters is effective in optimizing wellbore cleaning without compromising the integrity of the circulation pumps.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CBR, CFD-DEM, Eulerian-Lagrangian, Pembersih Lubang, Serbuk Bor
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1260 Drilling and boring. T Technology > TN Mining engineering. Metallurgy > TN871.3 Offshore well drilling T Technology > TS Manufactures > TS170 New products. Product Development T Technology > TS Manufactures > TS171 Product design
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	M. Farras Rheza Firmansyah
Date Deposited:	03 Aug 2026 01:52
Last Modified:	03 Aug 2026 01:52
URI:	http://repository.its.ac.id/id/eprint/141925

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