Jan 21 (Reuters) - Otto Energy Ltd
* Says executed final binding agreements with BHP Billiton to terminate farm-out agreement over sc55
* Says BHP Billiton to pay $3 million to Otto on approval of re-assignment and $24.5 million upon drilling an exploration well
* Says submitted request to Philippines department of energy for re-assignment of BHPB's 60% working interest to co, taking co's interest in sc55 to 93.18%
* Source text for Eikon
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