Hidayat, Aditya Nur (2025) Analisis Pegaruh Tekanan Tinggi Dengan Temperatur 177C Terhadap Karakteristik Korosi Materi Baja AISI 4145H Menggunakan Brine Solution Di Lingkungan Sumur Minyak Bumi. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Completion fluid memiliki peran penting dalam menyelesaikan sumur minyak atau gas, karena digunakan untuk mempersiapkan operasi akhir sebelum produksi dimulai. Salah satu komponen utama completion fluid adalah brine solution yang mengandung ion-ion seperti klorida, bromida, formate, nitrat, dan fosfat. Brine solution ini dapat bersifat korosif dan berpotensi memengaruhi kinerja material pada drill string, terutama pada bagian pipa drill collar. Baja AISI 4145H sering digunakan sebagai material drill collar karena kekuatan tariknya yang tinggi dan ketahanan terhadap kelelahan. Namun, ketahanan korosi baja ini dalam kondisi high pressure high temperature (HPHT) selama proses completion fluid belum banyak diteliti. Oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh tekanan dan temperatur tinggi terhadap karakteristik korosi material baja AISI 4145H menggunakan brine solution. Variasi yang digunakan pada kondisi HPHT adalah variasi tekanan 1000, 1500, 2000, dan 2500 psi dengan suhu 177°C selama 1 minggu. Sedangkan, pada kondisi room pressure room temperature (RPRT) sebagai pembanding, dilakukan variasi waktu imersi selama 1 hingga 4 minggu dengan tekanan 14,7 psi. Metode yang digunakan berupa uji kehilangan berat (weight loss) secara full immersion, dengan analisis tambahan berupa mikroskop optik, uji Optical Emission spectroscopy (OES), uji sifat mekanik (uji tarik, kekerasan, dan impak), serta analisis X-Ray Diffraction (XRD). Hasil pengujian menunjukkan bahwa laju korosi meningkat signifikan pada kondisi HPHT, dengan nilai tertinggi sebesar 0,190 mm/tahun pada tekanan 2500 psi, yang hampir empat kali lebih besar dibandingkan pada tekanan 2000 psi. Sedangkan pada kondisi RPRT, laju korosi cenderung lebih rendah dan stabil, yaitu 0,007 mm/tahun pada minggu pertama, serta menurun menjadi 0,002 mm/tahun pada minggu kedua hingga keempat. Jenis korosi yang terjadi di kedua kondisi adalah korosi seragam, tetapi pada HPHT, hal tersebut terjadi secara lebih agresif dengan permukaan terdegradasi dan produk korosi kristalin yang terbentuk berupa Fe₃O₄, FeSO₄, FeS, dan FeCl₃. Pada RPRT, produk korosi tidak terbentuk signifikan dan tidak terjadi degradasi yang signifikan pada permukaan spesimen. Hasil tersebut menunjukkan bahwa tekanan dan suhu tinggi mempercepat laju korosi baja AISI 4145H dalam larutan brine.
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Completion fluids are essential in the final stages of oil and gas well development, serving to stabilize the well and prepare it for production. A primary component of these fluids is brine solution, which contains corrosive ions such as chloride, bromide, formate, nitrate, and phosphate. These aggressive ions can significantly impact the performance of materials used in the drill string, particularly the drill collar. AISI 4145H steel is widely employed in such applications due to its high tensile strength and excellent fatigue resistance. However, limited research has addressed its corrosion behavior under high-pressure, high-temperature (HPHT) conditions in the presence of brine-based completion fluids. This study aims to evaluate the effect of elevated pressure and temperature on the corrosion characteristics of AISI 4145H steel when immersed in a synthetic brine solution. The experimental conditions included HPHT testing at pressures of 1000, 1500, 2000, and 2500 psi at a constant temperature of 177 °C for one week. As a comparative baseline, room pressure room temperature (RPRT) tests were conducted at 14.7 psi with immersion durations ranging from one to four weeks. Corrosion rates were quantified using the full immersion weight loss method, supported by optical microscopy, Optical Emission Spectroscopy (OES), mechanical testing (tensile, hardness, and impact), and X-ray Diffraction (XRD) analysis. Results indicated a pronounced increase in corrosion rate under HPHT conditions, with the highest value recorded at 0.190 mm/year under 2500 psi—nearly four times higher than that observed at 2000 psi. Under RPRT conditions, the corrosion rates remained low and relatively stable, beginning at 0.007 mm/year in the first week and decreasing to 0.002 mm/year by the fourth week. Uniform corrosion was observed across all test conditions; however, under HPHT exposure, the degradation was significantly more severe, with the formation of crystalline corrosion products such as Fe₃O₄, FeSO₄, FeS, and FeCl₃. In contrast, negligible corrosion products and surface degradation were detected under RPRT conditions. These findings confirm that high pressure and temperature environments markedly accelerate the corrosion of AISI 4145H steel in brine-rich systems, which is critical for assessing material integrity in downhole completion operations.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | AISI 4145H, Brine Solution, Laju Korosi, AISI 4145H, Brine Solutions, Corrosion Rate. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Aditya Nur Hidayat |
| Date Deposited: | 30 Jul 2025 09:05 |
| Last Modified: | 30 Jul 2025 09:05 |
| URI: | http://repository.its.ac.id/id/eprint/124437 |
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