Application of Volumetric, Material Balance and Decline Analysis Methods for Gas Initially in Place Estimation

• Main Author: Hong, Leong Sau
• Format: Final Year Project
• Language: English
• Published: IRC 2015
• Subjects: T Technology (General)
• Online Access: http://utpedia.utp.edu.my/16861/1/FYP%20Leong%20Sau%20Hong_14931%20Volumetric%2CMB%2CDCA.pdf; http://utpedia.utp.edu.my/16861/

Initial estimate of GIIP by volumetric method needs to be validated with independent methods in order to gain confidence. Flowing material balance ( p z vs cumulative production), Fetkovich type curve and Blasingame type curve matching were used for verification. When the GIIP estimated by these three methods do not converge to one another, it yielded uncertainties in the GIIP estimated by many oil and gas operators. When the GIIP estimated were reasonably close to one another, then operators can proceed with the development plan as the confidence in getting the GIIP right was high. A comparison study of these three methods suggested that volumetric method, material balance, Fetkovich type curve and Blasingame type curve yielded 634 BCF, 585 BCF, 567 BCF and 557 BCF respectively. These three independent methods have been tested with real field data and the results were close enough. With only differences of 7%, 11% and 12 % from the volumetric method, the results were within the limits of 14% and the confidence of initial estimate was high.