[UK] Tolmount

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escveritas
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[UK] Tolmount

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Dana is a 50% partner along with operator Premier Oil in the Tolmount Southern North Sea gas project. The project was given the go-ahead in August 2018 by the joint venture and infrastructure partners.

The field is expected to produce around 90 million boe gross over its lifetime, with Dana’s net share being around 28,000 boe a day at peak production. First gas is expected in late 2020.

Dana and Kellas Midstream Limited have formed a 50:50 infrastructure joint venture which will finance the platform and pipeline (known as the Humber Gathering System) and the modifications to Centrica’s Easington terminal to which gas will be exported. The JV will be paid a tariff for transportation of the Tolmount gas.

Tolmount gas field (50% operated interest)

The Tolmount gas field is situated in block 42/28d, in the UK Southern North Sea. It was discovered in 2011 with further appraisal drilling in 2013. Tolmount is one of the largest discoveries in the Southern Gas Basin in recent years. Premier acquired its interest in the wider Tolmount Area, which includes Tolmount, the Tolmount East and Mongour discoveries and exploration prospect Tolmount Far East as a result of the E.ON North Sea Acquisition.

In February 2017, a development concept comprising a standalone normally unmanned installation (“NUI”) unit and a new gas export pipeline to the shore was selected to develop Tolmount. Front end engineering and design (“FEED”) work was completed over the course of 2017 and the first half of 2018. The project was sanctioned by the joint venture and the infrastructure partners in August 2018. Premier’s share of the capital expenditure to develop Tolmount is approximately US$120 million, comprising project management and development drilling costs. The Humber Gathering System, an infrastructure joint venture, will own and pay for the platform and pipeline capital expenditure as well as pay for upgrades to the onshore terminal In return, Premier will pay a tariff for the use of the infrastructure.

The 500 BCF Tolmount development is scheduled for first gas in Q2 2021. The laying of the 20 inch gas export pipeline was completed in the summer 2020, and the platform built in the Rosetti yard in Italy was installed offshore in October 2020. The drilling rig will be mobilised thereafter to assist with final commissioning of the Tolmount platform and to drill the Tolmount development wells. Initial peak production rates of over 50 kboepd (gross) are expected and once on-stream, production from Tolmount is expected to continue until at least 2036.

Tolmount East

On 17 October 2019, Premier announced the success of the Tolmount East well in an undrilled area four kilometres east of the 500 bcf Tolmount gas field. The well penetrated 241 feet of gas bearing high quality Leman sands with a net-to-gross ratio of 71 per cent., porosity of 16 per cent. and gas saturation of 82 per cent.

The well was targeting 220 BCF of P50 gross resource, in an undrilled area four kilometres east of the 500 BCF Tolmount gas field.

The well penetrated 241 feet of gas bearing high quality Leman sands with a net-to-gross ratio of 71%, porosity of 16% and gas saturation of 82%. The quality and thickness of reservoir sands encountered are at the upper end of expectations and no gas water contact was penetrated. A full Logging-While-Drilling and wireline acquisition programme was undertaken, including extensive pressure data and fluid sampling. The reservoir section was successfully cored with 216 feet being recovered.

The well data will now be integrated with the new 3D seismic dataset as part of the fast-track development planning for Tolmount East. This is already well advanced ahead of project sanction targeted for the second half of 2020. This well result also has positive implications for other targets within the Greater Tolmount area, including Tolmount Far East and the Mongour discovery.

Premier continues to progress Tolmount East so that a final investment decision can be made by year-end 2020 with the development concept (subsea tieback to the Tolmount infrastructure) agreed earlier in the year. Once on-stream Tolmount East (and potentially Mongour which could also be developed as a subsea tieback to the Tolmount infrastructure) will help extend plateau production from the Tolmount area.

There is considerable upside within the Greater Tolmount Area. The success at Tolmount East unlocks the Mongour discovery to the north and also reduces the uncertainty of the Tolmount Far East prospect which Premier is currently maturing ahead of drilling in 2023.

Premier’s partner in Tolmount Area is Dana.

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escveritas
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Re: [UK] Tolmount

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The new Tolmount platform following installation of the topsides
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