REGAL INTERNATIONAL <RGL> UPS BELL <BPSIQ> BID Bell Petroleum Services Inc said Regal International Inc has doubled its offer for Bell stock to one Regal share for each Bell share from half a share previously. The company said it is seriously considering the new offer but has also received an expression of interest for a possible merger into a Fortune 500 company it did not identify that will be investigated at meetings to be held later this week. It said it will explore all possibilities before recommending a final course of action.