#TITLE_ALTERNATIVE#

• Main Author: IRAWAN (NIM:32211301), DEDY
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21628
• Institution: Institut Teknologi Bandung

Reservoir characterization, production forecasting, reserves estimation and <br /> <br /> classifications are very important in the CBM field development. This study <br /> <br /> proposes new methods for reservoir characterization and forecasting using <br /> <br /> production curve type, and proposes new methods to simultaneously estimate <br /> <br /> radius of investigation and radius of desorption, that have never been done before, <br /> <br /> using semi-analytical approach. <br /> <br /> Sensitivity analysis using numerical model is utilized in production type curve <br /> <br /> development. The proposed method aims to refine the production type curve that <br /> <br /> commonly used. This method allows the evaluation of CBM well production <br /> <br /> behavior to be better because it can evaluate the transient period and pseudo steady <br /> <br /> state period. <br /> <br /> The desorption radius is estimated using cumulative gas production data. <br /> <br /> Cumulative water production data, fractional flow curve and sigmoid function are <br /> <br /> used as a concept of estimating water saturation distribution as a function of time <br /> <br /> and radius, and this concept was used to estimate radius of investigation. <br /> <br /> Numerical model was developed to verify proposed radius of desorption and radius <br /> <br /> of investigation calculation resulted from the analytical method. San Juan Basin <br /> <br /> coal reservoir properties data were used for conducting the applicability of <br /> <br /> proposed method. <br /> <br /> It was successfully showed that this proposed method can simultaneously estimate <br /> <br /> the radius of desorption and the radius of investigation using gas & water <br /> <br /> production rate and cumulative data. The results from the proposed method was <br /> <br /> also compared with the numerical reservoir simulation method.