ENHANCED COALBED METHANE IN NIGERIA: ONYEAMA COALBED

Abu Robin Nyemenim, Cyrus Aseibichin, Adeloye Olalekan Michael, Wilcox Ziebiye Zaccheaus

Abstract: Carbondioxde enhanced coalbed methane(CO2-ECBM) production from Onyeama coalbed field in Anambra basin, Nigeria was simulated using Eclipse 300 simulator in vertical and horizontal well orientations, with the resulting production compared with coalbed methane(CBM) production from the well in both orientations. The simulation was construed for 25 years and cumulative production result from carbondioxide enhanced coalbed methane in vertical and horizontal well and coalbed methane in vertical and horizontal well yields 10466.60MMSCF, 45648.42MMSCF and 6501.81MMSCF, 19866.10MMSCF respectively. The recovery factors of carbondioxide enhanced coalbed methane and coalbed methane production from Onyeama coalbed in vertical and horizontal orientations are 8.03%, 35.04% and 4.99%, 15.2% respectively. Thus, carbondioxide enhanced coalbed methane shows higher recovery factor as compared with coalbed methane, thereby leading to increase or improve production from Onyeama coalbed field with carbondioxide enhanced coalbed methane in horizontal well orientation yielding the highest recovery factor and least coal gas de-concentration. Hence, coal gas de-concentration and recovery factor are influenced by the developmental or production method and they are used as measures for selecting most efficient developmental process

Keywords: Carbondioxide Enhanced Coalbed Methane, Coalbed Methane, Onyeama Coalbed Field, Vertical Coalbed Well, Horizontal Coalbed Well, Eclipse 300 Simulator, Coal Gas Concentration, Recovery Factor.

DOI: https://doi.org/10.15623/ijret.2016.0511032