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The Atwood Orca jack up rig. Image courtesy of Atwood.

Mubadala Petroleum spudded the the fourth and fifth of 15 planned development wells at the Manora Oil field in the Gulf of Thailand Friday.

The MNA-04 and MNA-05 wells will be drilled to final target depths of 11,253 feet and 6,345 feet measured depth.

MNA-04 is the first of the five planned water injector wells.

MNA-05 will be completed with electric submersible pumps ahead of handover to production.

Wells MNA-04 and MNA-05 were drilled by the Atwood Orca jackup drilling unit.

The third Manora well, MNA-03, was also drilled to its final target depth Friday.

Manora is located in the G1/48 concession in the Gulf of Thailand.

Mubadala Petroleum, a wholly owned subsidiary Abu-Dhabi based Mubadala Development Company, is the operator of the concession and holds a 60 percent stake through its affiliate Pearl Oil.

Australia-based Tap Energy holds a 30 percent stake and Thailand-based Northern Gulf Petroleum owns a 10 percent stake.

The Manora A platform is located in the Gulf of Thailand in 150 feet of water.

The development drilling program calls for the drilling and completion of 15 wells with 10 producers and five injectors.

The program is expected to last until the end of the first quarter 2015.

Production at Manora is now expected to start up in the second half of October rather than at the end of the third quarter 2014 as previously projected.

Proved and probable reserves held in Manora’s primary reservoir are estimated at 20.2 million barrels gross.

Mubadala expects to add an additional 8.3 million barrels gross to the reserves once water injection is implemented during the field’s start up.