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Oil rig
Oil rig

Oil and Gas

Allen & Overy's market leading Oil & Gas practice advises governments and NOCs (National Oil Companies), IOCs (International Oil Companies), Independent Oil and Gas Companies, and funders (debt and equity) on all aspects of the oil and gas supply chain, including upstream (exploration and production), midstream (storage and transportation), downstream (fuels and lubricants, marketing and refining, retail and chemicals) and LNG.

Allen & Overy's integrated energy practice continues to be at the forefront of the oil and gas sector, advising IOCs, NOCs, independents, governments, funders (equity and debt) and oilfield services companies on market leading transactions across the full spectrum of upstream, midstream and downstream matters, including within the LNG sector. Increasingly, we are working with our clients to help them on their journey towards net zero, including on green fuels, blue hydrogen and carbon capture and sequestration projects.

Our experience of contractual and economic frameworks for oil and gas projects is extensive. We advise upstream clients on the grant, purchase, exchange, sale and financing of petroleum exploration and production interests throughout the world, whether based on licences, production sharing agreements or service contract buy-back structures. We also regularly undertake the drafting, negotiation and review of production sharing, joint operating and unitisation agreements, LNG structures and approaches and pipeline construction, operation, transportation and loading arrangements. On crude oil, petrochemical products and natural gas/LNG sales agreements, we advise on all varieties of spot, term and life-of-field contracts and on the take-or-pay provisions that form the basis of many project financings throughout the world.

Key experience


The lenders on a USD1.2bn club facility in favour of ADNOC Global Trading Ltd.

Assa North-Ohaji South Gas Processing Plant

The lenders on a USD260m limited recourse debt financing to fund ANOH Gas Processing Company’s Assa North-Ohaji South midstream gas processing plant project in Nigeria.

Saudi Aramco Gas Pipeline Company

Hassana Investment Company, part of a consortium led by BlackRock Real Assets, on the USD15.5bn lease and leaseback deal with Saudi Arabian Oil Company (Saudi Aramco).

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Occidental Petroleum

The lender on the USD235m financing to support the acquisition of Occidental Petroleum Corporation, upstream oil assets in Colombia.

Baku-Tbilisi-Ceyhan Oil Pipeline

The lenders on the USD400m partial refinancing for the development of the Baku-Tbilisi-Ceyhan 1,768km long 1.0mbbl/day capacity pipeline reaching from Baku, Azerbaijan through Tbilisi, Georgia to Ceyhan, Turkey.

Ichthys LNG

The consortium on the USD8.3bn refinancing to support the development of a subsea projection system, semi-submersible central processing facility, a floating production, storage and off take vessel at the Ichthys Fields in the Browse Basin, Australia.


APAC Oil and Gas Deal of the Year 2020

Ichthys LNG Refinancing – IJGlobal Awards 2021

“One of the leading firms that can advise lenders on international finance in the emerging markets.”

Chambers and Partners Global-wide 2021 – Projects & Energy: Oil & Gas

“Allen & Overy’s international capabilities are excellent.”

Chambers and Partners Global-wide 2021 – Projects & Energy: Oil & Gas

News and insights

Silo with crows sitting on the hand rails with blue sky background

News: 27 March 2024

Allen & Overy advises on the sale of majority stake in GasNet

Allen & Overy is advising Macquarie Asset Management (Macquarie), on behalf of managed funds, on the disposal of its 55.21% indirect interest in GasNet, the Czech Republic’s largest gas distribution…

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Equipment, cables and piping as found inside of a modern industrial power plant

News: 20 February 2024

Allen & Overy advises Uniper on sale of Hungarian gas fired power plant Gönyű to Veolia

Allen & Overy is advising the international energy company Uniper SE, Düsseldorf ("Uniper") on its sale of 100% of shares in its subsidiary Uniper Hungary Energetikai Kft. ("Uniper Hungary").

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interior of a modern industrial warehouse

News: 08 February 2024

Allen & Overy advises on a EUR650 million bond by Italgas

Italgas S.p.A. has placed a new bond issue, due 8 February 2029, for a nominal amount of EUR650 million intended for institutional investors. Allen & Overy has advised the joint bookrunners on the…

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Publications: 18 November 2022

UK sanctions against Russia: the pressure intensifies

The UK Government has introduced two further packages of sanctions against Russia in quick succession. 

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