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Abstrak :
Rock compressibility is an important formation rock properties. It influences various processes in reservoir and rock formations that encompass from sources of reservoir driving energy, changes in other reservoir properties, to land subsidence.

Abstrak :
ABSTRAK
Fluid dynamics analysis can be accurately approximated by using a computer-based numerical method. Rely on the mass and momentum governing equation, the mathematics model for the compressible condition is numerically difficult to overcome. Through an artificial compressibility method, the quasi compressible condition solution can be simplified. This study will investigate the classical lid-driven cavity case model to affirm the artificial compressibility method. The result shows that the current model is in-line with the previous study for the lid-driven cavity case. A conventional benchmark with the previous numerical study is shown as wel

Abstrak :
Salah satu parameter utama perencanaan pengeboran dalam industri migas adalah Pore pressure. Penentuan Pore Pressure penting untuk mencegah resiko yang tinggi seperti zona loss pressure ataupun zona blowout. Oleh karena itu diperlukan estimasi Pore Pressure yang akurat dan mencakup karakter reservoar yang heterogen. Pendekatan yang digunakan dalam estimasi Pore Pressure penelitian ini adalah metode pore compressibility PC dengan menggunakan data core. Akan tetapi pendekatan ini terbatas untuk ketersediaan data core. Penelitian ini akan mengintegrasikan metode pemodelan Differential Effective Medium DEM dan Fluid Replacement Model FRM ke dalam estimasi Pore Pressure metode PC sebagai solusi dari karakterisasi heterogenitas di reservoar karbonat dan keterbatasan data core. Dengan pemodelan DEM diperoleh deskripsi reservoar melalui analisa mineral dan tipe pori. Estimasi Pore Pressure metode PC bergantung pada fungsi dari kompresibilitas bulk Cb dan kompresibilitas pori Cp , dimana tiap tipe pori pada reservoar karbonat memiliki nilai Cb dan Cp yang berbeda ndash; beda. Fenomena disequlibirium compaction menyebabkan naiknya tekanan fluida didalam pori. Tekanan pori sangat dipengaruhi oleh fluida di dalam pori batuan. Oleh karena itu, fluida yang digunakan sama dengan fluida yang ada pada reservoar agar estimasi tekanan pori lebih akurat. Pada penelitian ini nilai kedua kompresibilitas dihasilkan dengan proses DEM menggunakan persamaan Gassman untuk mengatasi keterbatasan data core. Hasil estimasi Pore Pressure pada reservoar karbonat lapangan ldquo;X rdquo; sebesar 2000 psi hingga 4000 psi, dikalibrasikan dengan tekanan FMT dan data mud log pada sumur penelitian. Rekomendasi berat lumpur pada reservoar karbonat untuk sumur penelitian sebesar 12.6 ppg hingga 13.6 ppg.

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One of the main parameter for drilling plan is Pore pressure on oil and gas company. Pore pressure estimation is important to avoid has high risk as if loss pressure zone or blowout zone. Therefore, accurate Pore Pressure prediction that cover heterogen reservoar character is required. The most accurate approach on Pore Pressure prediction is pore compressibility PC method which is using core data, but this approach is limited for core data limitation. This research is integrating Differential Effective Medium DEM method and Fluid Replacement Model FRM into Pore Pressure prediction PC method as a solution for heterogen characterization on carbonate reservoar and core data limitation. Using DEM, reservoar description is obtainable through mineral analysis and pore type. Pore pressure prediction PC method depend on function of bulk compressibility Cb and pore compressibility Cp , where each of carbonate reservoar pore types have different value of Cb and Cp. Disequlibirium compaction phenomenon causing pressure on fluid inside the pore. Pore pressure is sensitive for fluids inside the pore, Therefore, fluid that is used for this research is identical with the fluids on the reservoar so that the calculation can be more accurate. On this research the value of both compressibility is a result of DEM process with Gassman equation to overcome limited core data. Pore pressure prediction PC method result on carbonate reservoar Field ldquo M rdquo is about 3000 psi to 4000 psi, which is calibrated with the FTM pressure data and mud log data from th well. Recommended mudweight for carbonate reservoar about 12.6 ppg to 13.6 ppg.

Abstrak :
ABSTRACT
The Supercompressibility factor (Fv) of an Indonesian natural gas (CNG) has been determined in the temperature range from 303.15 K and 373.15 K, by using the new modified Burnett Apparatus. The maximum experimental pressure is about 12.5 MPa. In this paper, the value of Z(P) and Z(ρ) are compared with the value calculated from the experimental data based upon the method, which are recommended by American Gas Association such as PAR AGA-NX-19 mod (Standard Method) and AGA-Analysis Method. The analysis method is more accurate than other one, where the root-mean-squares error is less than 0.30% based on the relative deviation.

∆Z = (Z_calc-Z_exp)/Z_exp . 100% of the experimental data calculation

Abstrak :
Penelitian ini dilakukan untuk mendapatkan informasi geoteknik sampah perkotaan Indonesia. Informasi yang dimaksud meliputi berat jenis dan indeks kompresibiltasnya. Pengujian dirancang untuk mengetahui besar pengaruh perbedaan ukuran komponen-komponen sampah dan peristiwa dekomposisi terhadap kompresibilitas sampah perkotaan. Sampah perkotaan artificial dikembangkan agar komposisi sampah perkotaan lebih mudah dikontrol. Metode uji kompresi yang digunakan diadopsi dan dimodifikasi dari metode konsolidasi pada tanah lempung, yaitu dengan metode constant rate of strain. Analisis data menunjukkan bahwa karakteristik geoteknik sampah perkotaan artifisial yang diuji dipengaruhi oleh ukuran partikel dan lamanya waktu dekomposisi. Pengujian yang dilakukan pada sampel dengan ukuran lebih besar menunjukkan kecenderungan peningkatan nilai berat unit, indeks kompresi dan rekompresi. Sampel dengan waktu dekomposisi lebih lama menunjukkan kecenderungan peningkatan pada berat unit dan indeks kompresi serta penurunan pada indeks rekompresi. ...... This project is proposed to determine the geotechnics information of municipal solid waste in Indonesia including its unit weight and compression index. This experiment is designed mainly to observe the effect of particle size and decomposition process on geotechnics properties of Indonesian type municipal solid waste. Artificial Municipal Solid Waste system is developed for much easier control. Constant Rate of Strain method is selected as the compression test which is an adoption and modification of consolidation test on clay. Analysis on data shows that geotechnics characteristics of Indonesian type solid waste are similar with those reported by other researchers earlier. Calculated geotechnics parameters give observable change with respect to particle size and decomposition process. Result analysis shows that municipal solid wastes with larger particles size tend to have higher unit weight, compression index and recompression index. An increase in unit weight and compression index is also found for municipal solid wastes with longer decomposition time. However, the index of recompression of the samples tends to decrease for longer decomposition time.

Abstrak :
Penelitian ini dilakukan untuk mendapatkan informasi geoteknik sampah perkotaan Indonesia. Informasi yang dimaksud meliputi berat jenis dan indeks kompresibiltasnya. Pengujian dirancang untuk mengetahui besar pengaruh perbedaan ukuran komponen-komponen sampah dan peristiwa dekomposisi terhadap kompresibilitas sampah perkotaan. Sampah perkotaan artificial dikembangkan agar komposisi sampah perkotaan lebih mudah dikontrol. Metode uji kompresi yang digunakan diadopsi dan dimodifikasi dari metode konsolidasi pada tanah lempung, yaitu dengan metode constant rate of strain. Analisis data menunjukkan bahwa karakteristik geoteknik sampah perkotaan artifisial yang diuji dipengaruhi oleh ukuran partikel dan lamanya waktu dekomposisi. Pengujian yang dilakukan pada sampel dengan ukuran lebih besar menunjukkan kecenderungan peningkatan nilai berat unit, indeks kompresi dan rekompresi. Sampel dengan waktu dekomposisi lebih lama menunjukkan kecenderungan peningkatan pada berat unit dan indeks kompresi serta penurunan pada indeks rekompresi.

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This project is proposed to determine the geotechnics information of municipal solid waste in Indonesia including its unit weight and compression index. This experiment is designed mainly to observe the effect of particle size and decomposition process on geotechnics properties of Indonesian type municipal solid waste. Artificial Municipal Solid Waste system is developed for much easier control. Constant Rate of Strain method is selected as the compression test which is an adoption and modification of consolidation test on clay. Analysis on data shows that geotechnics characteristics of Indonesian type solid waste are similar with those reported by other researchers earlier. Calculated geotechnics parameters give observable change with respect to particle size and decomposition process. Result analysis shows that municipal solid wastes with larger particles size tend to have higher unit weight, compression index and recompression index. An increase in unit weight and compression index is also found for municipal solid wastes with longer decomposition time. However, the index of recompression of the samples tends to decrease for longer decomposition time.