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|competition=June 2015

|competition=June 2015

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==Coal bed methane==

==Coal bed methane==

Coal Bed Methane (CBM) is a gas contained in coal layer. This gas is a fraction of coal bed gas (CBG), natural gas that produced from a coal layer. There are some others gasses that also contained in a coal layer, such as Carbon dioxide (CO2), Nitrogen (N2), and water (H2O) (Thomas, 2002)

[[Coal bed methane]] (CBM) is a gas contained in [[coal]] layer. This gas is a fraction of coal bed gas (CBG), natural gas that produced from a coal layer. There are some others gasses that also contained in a coal layer, such as Carbon dioxide (CO2), Nitrogen (N2), and water (H2O) (Thomas, 2002)

The gas in a coal produced during the coalification process, that is the process of organic material change into peat, lignit, subbituminous, bituminous, till antrachite, as the influenced of pressure and temperature.

The gas in a coal produced during the coalification process, that is the process of organic material change into peat, lignit, subbituminous, bituminous, till antrachite, as the influenced of pressure and temperature.

The analysts use the Hasler Permeameter tool with modification with vibrator. First model that designed with vibrator place above the core holder according vertical vibration direction. Meanwhile second model with vibrator that place beside core holder with horizontal vibration direction and direction beetwen vibrator and core holder closer than the first model. From the result of laboratorium study with second model tools in 15 core in the field, find that the the porocity before vibration is 4.84%-26.73% and after the vibration the porosity increase until 53.9% with average 36.6%. Kabs data before vibration is 231.46 m – 1113.59 mD and after vibration can reach 54.1% with average 39.4%. Sor Data before vibration is 0.15%-0.57%. and after vibration can reacht decrease Sor untul 68% with average 66.1 %. From the result above, there is the same result beetwen sysntesis core and field core that give the image about the same changing pattern in rock pysical properties (φ, kabs and Sor) because the effect of vibration stimulation with increase of porosity and kabs and the decrease of Sor. The effect of pressure in vibration stimulation make the system is confined, and the direction effect from the vibration source about core holder can as effective as radius from vibrator strength.<ref name=Ridaliani_et_al />

The analysts use the Hasler Permeameter tool with modification with vibrator. First model that designed with vibrator place above the core holder according vertical vibration direction. Meanwhile second model with vibrator that place beside core holder with horizontal vibration direction and direction beetwen vibrator and core holder closer than the first model. From the result of laboratorium study with second model tools in 15 core in the field, find that the the porocity before vibration is 4.84%-26.73% and after the vibration the porosity increase until 53.9% with average 36.6%. Kabs data before vibration is 231.46 m – 1113.59 mD and after vibration can reach 54.1% with average 39.4%. Sor Data before vibration is 0.15%-0.57%. and after vibration can reacht decrease Sor untul 68% with average 66.1 %. From the result above, there is the same result beetwen sysntesis core and field core that give the image about the same changing pattern in rock pysical properties (φ, kabs and Sor) because the effect of vibration stimulation with increase of porosity and kabs and the decrease of Sor. The effect of pressure in vibration stimulation make the system is confined, and the direction effect from the vibration source about core holder can as effective as radius from vibrator strength.<ref name=Ridaliani_et_al />

In this era, the technology of vibroseismic can be useful in research that do in teoritic or laboratorium, aplication in field, and to predict the performance in the future that relate with economic evaluation. If mechanism that happen in reservoar applied in vibroseismic technology, there is a possibility to increase the production rate. But, the rate of success aplication in field cannot give the justification of description about mechanism yet (Ariadi et al., 2005)

In this [[era]], the technology of vibroseismic can be useful in research that do in teoritic or laboratorium, aplication in field, and to predict the performance in the future that relate with economic evaluation. If mechanism that happen in reservoar applied in vibroseismic technology, there is a possibility to increase the production rate. But, the rate of success aplication in field cannot give the justification of description about mechanism yet (Ariadi et al., 2005)

On the otherhand, the generally term in oil industry before the application of a technology . firstly, the prediction of the work wether technically or economically have to be done. In order to do the prediction step several method will be needed such as Decline Curve Analysis, laboratory research or reservoir simulation. But, until now there are no such prediction method that accepted by the oil industry, at this level of knowledge, empirical approachment is the most suitable method of the field prediction. There is also a prediction method that has been recommended by the russian researcher (Institute of the Eart Physics and Institute of Oil and Gas Research below Russian Academy Society) based on previous datas of production and water cut. After that, this method is being examined, evaluated and then proposed to more reliable method.<ref name=Ariadji_et_al>Ariadji, T., H. Purwanto, and D. B. Scarboroug, 2005, Metode Peramalan Dan Evaluasi Keekonomian Teknologi Vibroseismik. Bandung: Petroleum Engineering Department.</ref>

On the otherhand, the generally term in oil industry before the application of a technology . firstly, the prediction of the work wether technically or economically have to be done. In order to do the prediction step several method will be needed such as Decline Curve Analysis, laboratory research or reservoir simulation. But, until now there are no such prediction method that accepted by the oil industry, at this level of knowledge, empirical approachment is the most suitable method of the field prediction. There is also a prediction method that has been recommended by the russian researcher (Institute of the Eart Physics and Institute of Oil and Gas Research below Russian Academy Society) based on previous datas of production and water cut. After that, this method is being examined, evaluated and then proposed to more reliable method.<ref name=Ariadji_et_al>Ariadji, T., H. Purwanto, and D. B. Scarboroug, 2005, Metode Peramalan Dan Evaluasi Keekonomian Teknologi Vibroseismik. Bandung: Petroleum Engineering Department.</ref>