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Clifford Chance

Clifford Chance
David Sweeney

David Sweeney

Partner

Partner
David Sweeney

David H. Sweeney is a partner in Clifford Chance’s Houston office and is head of the oil and gas group. He advises clients on a broad range of oil and gas, coal, and other natural resource, infrastructure, service, and corporate transactions. His engagements include more than US$100 billion of transaction value, including mergers and acquisitions, debt and equity finance and capital deployment, operational matters, and financial restructurings, spanning the entire natural resource value chain in over 30 countries.

David is a frequent author and speaker on oil and gas topics and has written a comprehensive book on world-wide joint operating agreements and another on worldwide farmout, participation, and similar agreements. He is the past chair of the Institute for Energy Law’s Young Energy Professionals group and the Association for International Energy Negotiators’ Young Negotiators Group and has served on the Executive committee of the Institute for Energy Law.

Mergers, Acquisitions, and Joint Ventures

  • Karoon Energy on its ~US$760 million US Gulf of Mexico debut
  • Aquadrill, LLC in its US$1 billion merger with Seadrill
  • Apache Corporation in its approximately US$7.5 billion farmout transaction, Block 58, Suriname
  • Diamondback Energy in its US$2.2 billion acquisition of QEP Resources
  • Diamondback Energy in its US$862 million acquisition of Guidon Operating
  • LUKOIL in its US$2.25 billion acquisition of Petronas’ stake in the Shah Deniz natural Gas project, Caspian Sea, Azerbaijan
  • LUKOIL in its US$450 million acquisition of Fieldwood Mexico
  • DEA Deutschmark Erodel AG in its US$500 million acquisition of Sierra Oil and Gas
  • Apache Corporation in its US$505 million acquisition of Delaware Basin assets
  • Vital Energy in its US$405 million PDP sale to Sixth Street Partners
  • Diamondback Energy in its US$9.2 billion merger with Energen Corporation
  • Stone Energy in its US$2.5 billion merger with Talos Energy Corporation
  • Apache Corporation in its US$7 billion acquisition of E&P assets in Canada, Texas, and Egypt
  • Kinder Morgan in its US$38 billion merger with El Paso Corporation
  • Kinder Morgan in the US$7.15 sale of El Paso’s E&P business unit
  • EOG Resources in its US$400 million drillco transaction with The Carlyle Group
  • Diamondback Energy in its US$620 million drillco transaction with The Carlyle Group
  • A major, public oil and gas company in >US$1 billion of oil and gas “drillco” transactions
  • EP Energy in its ~US$300 million divestiture of Southern Midland Basin assets and concurrent acquisition of Eagle Ford Shale assets
  • Eni Petroleum in its US$4.8 billion acquisition of the Gulf of Mexico business unit of Dominion

Operating Agreements, Unitizations, and Infrastructure

  • A major, international energy company in the negotiation of a Caspian Sea joint development zone
  • Apache Corporation in multiple joint operating agreements, offshore Suriname
  • A publicly traded energy company in connection with a unitization, offshore Mexico
  • A major, international energy company in connection with a deepwater production handling and processing agreement
  • A publicly-traded Energy company in connection with multiple cost-of-service gathering and processing agreements, construction and operating agreements, and related agreements
  • A major, international energy company in multiple joint operating agreements, offshore Ivory Coast, Ghana, and Sierra Leone
  • A publicly-traded energy company in the negotiation of Production Sharing Contracts, offshore Uruguay and Dominican Republic
  • A publicly-traded energy services company in the negotiation of Production Sharing Contracts, offshore Somalia, Liberia, and
  • A major, international energy company in connection with an operating agreement and cost-sharing arrangements relating to a Gulf of Mexico floating production storage and offloading unit and related production system
  • An Alaskan Native Corporation in multiple joint operating agreements, North Slope, Alaska
  • An Alaskan Municipality in the acquisition and unitization agreement with respect to a Cook Inlet field
  • An independent exploration and production company in a North Sea unitization
  • A publicly traded energy company in a flare gas-for-bitcoin project

Service and Supply Sector Projects

  • A publicly-traded energy company in a drilling services contract, offshore Mexico
  • A major, integrated energy company in multiple 20K technology sharing and development agreements for ultra high-pressure environments
  • A major, integrated energy company in rig sharing agreements for deepwater operations, offshore West Africa
  • A major, integrated energy company in rig sharing agreements for deepwater operations, Gulf of Mexico
  • A publicly-traded energy company in a rig sharing agreement, offshore Suriname
  • A major, integrated energy company in rig sharing agreements for deepwater operations, offshore Romania

Private Equity Capital Deployment

  • A private equity fund in the ~US$400 million comprehensive refinance of existing debt and equity arrangements involving Marcellus Shale operations
  • A publicly-traded private equity fund in more than US$400 million of new line-of-equity commitments

Restructurings

  • Franklin Advisors in the Chapter 11 restructuring of US$9 billion in liabilities of Chesapeake Energy
  • Ad hoc note holder group of Jonah Energy in the US$1.3 billion restructuring
  • Second lien noteholder group of Rex Energy in the restructuring of US$930 million of liabilities
  • Ad hoc first lien lenders of Pacific Drilling in its US$3 billion restructuring
  • Ad hoc noteholder committee in the US$8.3 billion restructuring of Weatherford International
  • Martin Midstream Partners in its restructuring of more than US$364 million of unsecured notes
  • AllianceBernstein in the US$125 million restructuring of Elk Petroleum
  • A noteholders group in the restructuring of Parker Drilling involving approximately US$695 million of liabilities

News and client work

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Contact details

Career and qualifications

  • Yale University (BA cum laude) 2002
  • University of Texas School of Law, (J.D with honors) 2005
  • Admitted as an Attorney-at-Law in Texas 2005
  • Joined Clifford Chance as Partner 2023

Awards and citations

  • Chambers Global, Energy: Oil & Gas (Transactional): Central United States, (Chambers and Partners) 2022.
  • Chambers USA, leading practitioner in Energy: Oil & Gas (Transactional), (Chambers and Partners) 2021.
  • Recommended in The Legal 500 Latin America, Projects and Energy, (Legalease, Ltd.) 2021.
  • IFLR1000, Notable Practitioners, (Delinian Limited) 2020.
  • WWL: Energy, Global Elite Thought Leaders, (Law Business Research Ltd) 2020.
  • Recognized by The Legal 500 US as a "Next Generation Lawyer" in 2019 and "Next Generation Partner" in 2020 to 2021, and recommended in Energy: Transactions: Oil and Gas, (Leagalease, Ltd.) 2019 to 2021.