Feb 11 (Reuters) - Cooper Energy Ltd COE.AX :
* H1 UNDERLYING PROFIT UP 41% TO $3.1 MILLION FROM $2.2 MILLION
* SOLE GAS FIELD IS EXPECTED TO PRODUCE ITS FIRST GAS FOR COMMISSIONING OF UPGRADED ORBOST GAS PLANT IN JUNE
* APA GROUP IS CURRENTLY CONDUCTING UPGRADE TO ORBOST GAS PLANT
* H1 SALES REVENUE GREW 16% TO $36.2 MILLION