Prediksi Tekanan Pori Menggunakan Metode Kompresibilitas di Reservoir Karbonat, Studi Kasus: Lapangan MZ JOB Pertamina – Petrochina East Java

., Muhazzib (2017) Prediksi Tekanan Pori Menggunakan Metode Kompresibilitas di Reservoir Karbonat, Studi Kasus: Lapangan MZ JOB Pertamina – Petrochina East Java. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Prediksi tekanan pori sangat diperlukan pada aktifitas eksplorasi hingga pengembangan lapangan minyak dan gas bumi. Prediksi yang akurat dapat menentukan berat jenis lumpur yang tepat sehingga menjadikan aktifitas pemboran sumur di industri minyak dan gas bumi lebih efektif, aman, dan efisien. Saat ini, prediksi tekanan pori terutama di reservoir karbonat masih menjadi tantangan yang besar di industri karena heterogenitas dari reservoir karbonat. Salah satu pendekatan yang dapat dilakukan yaitu, dengan menggunakan metode kompresibilitas yang mengadopsi dua parameter heterogenitas reservoir karbonat: kompresibilitas bulk dan kompresibilitas pori. Tetapi, nilai kedua parameter tersebut pada umumnya terbatas, karena hanya diketahui melalui pengukuran core. Penelitian ini dilakukan terhadap 3 sumur penelitian di Lapangan MZ JOB Pertamina-Petrochina East Java yang bertujuan untuk mendapatkan nilai kompresibilitas bulk dan kompresibilitas pori menggunakan data well log melalui proses fluid replacement modelling, mengetahui mekanisme yang menyebabkan overpressure di wilayah penelitian, lalu memprediksi tekanan pori di reservoir karbonat menggunakan metode kompresibilitas. Hasil perhitungan tekanan pori lalu dibandingkan dengan tekanan lumpur pemboran, data tekanan langsung (RFT), serta perhitungan d’exponent. Selain itu, juga dilakukan analisis untuk menentukan berat jenis lumpur pemboran yang aman dan efisien pada reservoir karbonat di Lapangan MZ JOB Pertamina - Petrochina East Java. Analisa penyebab overpessure pada sumur penelitian menggunakan karakteristik data log shale terhadap normal compaction trend dan menunjukkan bahwa overpressure pada lapangan penelitian disebabkan oleh mekanisme loading atau disequilibrium compaction akibat laju sedimentasi yang tinggi dari formasi Ngrayong. Selain itu, parameter kompresibilitas bulk dan pori yang didapatkan dari proses fluid replacement modelling dapat menghasilkan nilai tekanan pori yang baik dan tepat melalui metode kompresibilitas. Hal tersebut ditunjukkan melalui perbandingan yang cocok antara hasil perhitungan tekanan pori dengan tekanan lumpur, d’exponent dan masalah pemboran. Selain itu, nilai selisih rata-rata antara tekanan pori dengan data tekanan langsung (RFT) cukup baik yaitu kurang dari 1000 psi, dimana pada sumur MZ-1 yaitu 162.63 psi, MZ-2 yaitu 503.62 psi, dan MZ-3 yaitu 666.26 psi. Rekomendasi berat jenis lumpur pemboran untuk Lapangan MZ ditentukan dengan menggunakan safety factor sebesar 0.7 ppg dan safety window yang berada di antara nilai tekanan pori dan tekanan rekah. ================================================================================================================== Pore pressure prediction is essential for exploration until development stage in oil and gas industry. An accurate estimation is critically important to determine reliable mudweight for efficient, effective, and safe drilling activity. Currently, pore pressure prediction especially in carbonate reservoir is still a big challenge in industry because the heterogenity of carbonate reservoir. Reliable approach that we could do is using compressibility method that adopt two parameter from the heterogenity of carbonate reservoir: bulk compressibility and pore compressibility. However, both of those parameters are limited, it because those parameters are only available from core measurement. This research is focused on 3 research wells in MZ Field JOB Pertamina-Petrochina East Java that aims to determine bulk and pore compressibility using well log data through fluid replacement modelling, determine causal mechanism of overpressure in research area, and calculate pore pressure in carbonate reservoir using compressibility method. The result of pore pressure calculation will be compared with mud pressure, direct pressure (RFT), and d’exponent calculation. In addition, this research also analyze about effective and efficient mudweight for carbonate reservoir in MZ Field JOB Pertamina-Petrochina East Java. The causal mechanism of overpressure analysis is known by using shale log characteristic to normal compaction trend and showed that overpressure in MZ Field is caused by loading mechanism or disequilibrium compaction as result of rapid sedimentation from Ngrayong formation. In other hand, bulk compressiblity and pore compressibility which obtained from fluid replacement modelling is successfully yield good result of pore pressure in carbonate reservoir through compressibility method. That showed by the result of comparation between pore pressure and mud pressure, d’exponent and with hole problem. In addition, the average difference between pore pressure and direct pressure is well defined by the results are less than 1000 psi for each research wells: MZ-1 is 162.63 psi, MZ-2 is 503.62 psi, and MZ-3 is 666.26 psi. The mudweight recommendation for MZ Field is determined using safety factor about 0.7 ppg and safety window that positioned between pore pressure and fracture pressure.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Kompresibilitas bulk, kompresibilitas pori, reservoir karbonat, tekanan pori.
Subjects: Q Science > QE Geology
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > (S1) Undergraduate Theses
Depositing User: Muhazzib Muhazzib Muhazzib
Date Deposited: 12 Jul 2017 07:47
Last Modified: 12 Jul 2017 07:47
URI: http://repository.its.ac.id/id/eprint/42043

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