Jamaica Update: Commissioning of Drilling Study

United Oil & Gas PLC

10 September 2026

 

  United Oil & Gas PLC / Index: AIM / Epic: UOG / Sector: Oil & Gas

10 September 2026

United Oil & Gas plc

("United" or "the Company")

Jamaica Update: Commissioning of Drilling Study

United Oil & Gas Plc (AIM: "UOG"), the oil and gas company with a high-impact exploration asset in Jamaica and a development asset in the UK, is pleased to announce the appointment of NRG Well Management ("NRG") to undertake a drilling rig and long-lead availability study.

Highlights:

·      Supporting the Farm-out Process: Provides current market-based operational planning data to inform the Company's ongoing farm-out discussions.

•     Advances Drilling Readiness: NRG engaged to assess rig availability, market day rates, and procurement schedules, establishing key enablers for potential drilling.

·      Targeting High-Impact Prospects: Focused on capability for drilling the Colibri prospect (406 MMbo² mean prospective resources) and potential follow-on drilling at the Thunderball lead (603 MMbo² mean prospective resources).

The study advances operational planning for a potential future exploration drilling programme on the Company's Walton-Morant Licence, offshore Jamaica, which contains over 7 billion¹ barrels of prospective resource potential. NRG will engage directly with international rig contractors and supply chain vendors to evaluate:

·    Rig Availability: Direct market engagement to assess rig suitability, availability, indicative commercial rates, and mobilisation factors for offshore drilling rigs.

·    Dual-Target Suitability: Technical capability for Colibri (c. 750m water depth) with additional assessment for deep-water drilling at Thunderball (c. 1,900m water depth).

·    Long-Lead Equipment & Critical Well Services: Assessment of key long-lead drilling equipment and critical well service packages, and indicative procurement timelines.

·    Logistics Network & Supply Chain: Screening of regional supply chain and logistics support infrastructure across the Gulf of Mexico, Guyana, Suriname and Trinidad, alongside Jamaican port readiness.

NRG Well Management is a leading provider of international well engineering and project management services, with a focus on delivering safe and efficient operations across the full life cycle of exploration, appraisal, development, production, and decommissioned wells.

The commissioning of this study is a forward-planning and market assessment review and does not constitute a commitment, at this time, by United to drill a well. Any potential future drilling programme would be subject to, amongst other matters, the receipt of all necessary regulatory approvals from the Government of Jamaica and execution of commercial agreements.

The Company expects the study to be completed in the coming weeks and will update the market on its findings in due course. Furthermore, a summary of the Company's Walton-Morant licence prospect and lead portfolio, including Colibri and Thunderball, is provided in the appendix to this RNS.

Donal Meehan, Chief Operating Officer, commented:

"This drilling study marks an important step in our operational planning to advance the Walton-Morant Licence towards a potential future drilling programme. It will provide a current, market-based assessment of rig suitability, availability, commercial conditions, and the long-lead items required to drill Colibri and Thunderball or similar targets.

Colibri and Thunderball represent substantial exploration opportunities within the Licence, with a combined potential of over 1 billion barrels³ of mean prospective resources out of the 7 billion barrels¹ of prospective resources identified on the licence to date.

By undertaking this study now, we are positioning the Company for operational readiness ahead of future drilling, whilst providing valuable information to support our on-going work as we push to conclude the Jamaican farm-out process. We look forward to updating the market with the study results in the coming weeks."

Appendix:

Walton-Morant Asset Overview

The Walton-Morant Licence covers approximately 22,400 km² and contains over 7 billion¹ barrels of prospective resource potential across United's portfolio of identified prospects and leads.

Colibri Prospect - Colibri is a large exploration prospect in the Walton Basin with mean prospective resources of 406 MMbo², and a P10 high estimate of 966 MMbo². The prospect is defined on 3D seismic and comprises a large, well-defined structural closure within the Walton Basin. Located in approximately 750 metres of water, Colibri can potentially be drilled using a relatively broad range of floating drilling units, including suitable semi-submersibles and drillships.

Thunderball Lead - Thunderball is a significant exploration lead in the Morant Basin with mean prospective resources of 603 MMbo², and a P10 high estimate of 1,356 MMbo², and lies in approximately 1,900 metres of water. Thunderball forms part of a striking series of large, tilted fault-block structures mapped across the Morant Basin on 2D seismic data, with a number of substantial neighbouring prospects and potential look-alike follow-on opportunities along the same structural trend. This combination of lead scale and multiple analogous structures highlight the wider exploration potential of the Morant Basin beyond Thunderball itself.

Table 1: Over 7 Billion bbls is UOG's arithmetic sum of the Unrisked Mean/Mid-Case Prospective Resources for each prospect/lead identified within the Walton-Morant Licence boundary by UOG and previous operators.

Name	Assignation	Location	Mean/Mid Prospective Resources (MMBo / MMboe)
Lead 11F	Lead	Walton Basin	1126
Zumbador	Lead	Morant Basin	925
Thunderball	Lead	Morant Basin	603²
Colibri	Prospect	Walton Basin	406²
Lead D	Lead	Walton Basin	382
Moonraker	Lead	Morant Basin	323²
Cascade Central	Lead	Pedro Bank	275
Streamertail	Prospect	Walton Basin	221²
Oriole	Prospect	Walton Basin	220²
Boag	Lead	Walton Bank	219
Lead 6I	Lead	Walton Bank	205
Goldeneye	Lead	Morant Basin	174²
Moneypenny	Lead	Morant Basin	173²
Blofeld	Lead	Morant Basin	171²
Earspot	Lead	Walton Bank	145
Squire	Lead	Walton Basin	139
Lead 12M	Lead	Walton Basin	133
Lead 6H	Lead	Walton Bank	120
Lead 12V	Lead	Walton Basin	111
Cascade South	Lead	Pedro Bank	101
Lead6Q	Lead	Walton Bank	101
Cascade East	Lead	Pedro Bank	86
Rumpspot	Lead	Walton Bank	85
Lead 7P	Lead	Walton Bank	76
Lead 7N	Lead	Walton Bank	70
Lead 10K	Lead	Walton Basin	70
Lead 12L	Lead	Walton Basin	70
Lead 7T	Lead	Walton Bank	60
Bluefields	Lead	Walton Bank	57
Tody	Prospect	Walton Bank	53²
Mango	Lead	Walton Basin	53
Guani	Lead	Walton Bank	53
Lead 12U	Lead	Walton Basin	41
Jaws	Lead	Morant Basin	39²
Euphonia	Prospect	Walton Bank	38²
Lead 6G	Lead	Walton Bank	38
Booby	Lead	Walton Basin	34
Lead 10B	Lead	Walton Basin	32
Lead 7R	Lead	Walton Bank	28
Lead 7S	Lead	Walton Bank	28
TOTAL			7,284¹

Glossary

MMBo - Million Barrels of Oil

MMBoe - Million Barrels of Oil Equivalent

Footnotes

¹ Over 7 Billion bbls is UOG's arithmetic sum of the Unrisked Mean/Mid-Case Prospective Resources for each prospect/lead identified within the Walton-Morant Licence boundary by UOG and previous operators

² Gross Unrisked Mean Prospective Resources per GaffneyCline Report, 2020

³ UOG's Arithmetic sum of the GaffneyClines' Gross Unrisked Mean Case Prospective Resources for Colibri (406 MMbo) and Thunderball (603 MMbo)

**ENDS**

Enquiries
United Oil & Gas Plc (Company)
Investor Relations		[e-mail]
Beaumont Cornish Limited (Nominated Adviser)
Roland Cornish | Felicity Geidt | Asia Szusciak		[phone]
Tennyson Securities (Joint Broker)
Peter Krens		[phone]
Shard Capital Limited (Joint Broker) Damon Heath | Isabella Pierre		[phone]

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Notes to Editors

United Oil & Gas is an oil and gas company with a development asset in the UK and a high impact exploration licence in Jamaica.

The business is led by an experienced management team with a strong track record of growing full cycle businesses, partnered with established industry players and is well positioned to deliver future growth through portfolio optimisation and targeted acquisitions.

United Oil & Gas is listed on the AIM market of the London Stock Exchange. For further information on United Oil and Gas please visit www.uogplc.com

 

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