TY  - JOUR
T1  - Radius of Investigation and Radius of Desorption in CBM Reservoir
AU - Irawan, Dedy AU - Abdassah, Doddy AU - Syihab, Zuher AU - Sitaresmi, Ratnayu 
JO  - Journal of Engineering and Applied Sciences
VL  - 12
IS  - 22
SP  - 6045
EP  - 6051
PY  - 2017
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2017.6045.6051
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2017.6045.6051
KW  - Radius of investigation
KW  -radius of desorption
KW  -CBM
KW  -practical manner
KW  -estimation
KW  -classification
AB  - Reserves estimation and classification in reservoir are important step in the CBM field development.
Estimation both parameters are depend on radius of investigation and radius of desorption. This study propose
semi analytical method for estimation of radius of investigation combining with radius of desorption.
Desorption radius was estimated using cumulative gas production data. Cumulative water production data,
fractional flow curve and sigmoid function are used to estimate water saturation distribution as a function of
time and radius, this concept was used to estimate radius of investigation. Numerical model was developed to
verify proposed radius of desorption and radius of investigation calculation results. Evaluation using San Juan
Basin coal reservoir properties was conduct to understand and check applicability of proposed method. This
proposed method can estimate radius of desorption and radius of investigation simultaneously using gas and
water production rate and cumulative data. Comparison proposed method with reservoir simulation results are
in very good agreement. Since, time parameter is not used in the calculation, this method is very simple in
practical manner.
ER  -