Masirah Oil has begun drilling the first well in an infill campaign at the Yumna oil field offshore Oman, with production from the new well expected in November 2026, Offshore Energy reported. The operation is in Block 50 in the Gulf of Masirah, east of Oman, where the company is the sole concession owner.
The campaign follows an August 2026 contract signed by Arabian Drilling with Masirah Oil and Northern Offshore covering two firm wells and options for two more. Masirah Oil general manager Mike Hopkinson gave the November production forecast. The report identifies Masirah as an indirect subsidiary of Singapore’s Rex International, which holds an 87.5% interest following a restructuring.
Yumna’s offshore infrastructure includes a floating storage tanker, which was replaced in 2022 to enable it to remain at the field for several years without dry-docking. The mobile offshore production unit was also replaced that year with upgraded facilities. Those changes preceded subsequent drilling and well maintenance programmes at the field, according to Offshore Energy.
Block 50 covers approximately 17,000 square kilometres. Yumna first produced oil in February 2020, with approval of its field development plan and a declaration of commerciality following in July that year. Production from Yumna-2 began in January 2021, followed by Yumna-3 in February 2021, expanding the field’s producing well base.
A campaign launched in the fourth quarter of 2022 was completed in early 2023. It included replacing the electrical submersible pump at Yumna-3 and drilling and completing Yumna-4 for production. Masirah subsequently completed a multi-well programme in 2024, bringing Yumna-5 into production in April and carrying out workovers on three existing producing wells, one more than initially planned.
Masirah says it regularly adjusts the field’s production rate with the objectives of maximising recovery, supporting viable long-term output and substantially increasing Block 50’s oil reserves. The latest infill drilling adds another development campaign to that sequence, with the November start-up remaining the company’s expectation.