Masirah Oil, a subsidiary of Singapore-headquartered independent Rex International, has completed a key offshore drilling campaign in Oman’s Block 50.

The company on Monday confirmed the development, and said it has completed the fourth quarter 2022 drilling campaign which comprised a workover of the Yumna-3 well and drilling of the Yumna-4 well offshore Oman.

“The workover of Yumna-3 consisted of replacing the electrical submersible pump (ESP) in the well,” it noted.

Masirah stated that “with the new ESP, Yumna-3 is now producing an average of 4050 barrels of oil equivalent per day as compared to 3590 boepd with the previous ESP".

The company noted the Yumna-4 well was drilled with a dual objective — to test the eastern extension of the Aruma reservoirs of the Yumna Field and “an exploration target below and northeast of the field”.

Masirah said the well “was successful at the Aruma level, where it penetrated 9.6 metres of net oil pay, consistent with the pre-drill prognosis”.

“The well was completed for production and has flowed at 4050 boepd,” it added.

Rex noted that oil shows were encountered in the Khufai formation and 16.5 metres of core was recovered.

“Results of the core analysis will likely determine if additional drilling/evaluation of this Khufai prospect is justified,” it said.

Stuck downhole

The core has been sent to a laboratory for detailed analysis. However, Rex admitted that planned formation evaluation programme could not be completed due to a stuck wireline tool that could not be retrieved from the borehole.

Masirah Oil holds 100% operated equity in Oman’s Block 50.

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