Archer is the well company, a global oilfield service company specializing in drilling services and well services. It employs over 7,000 people unified by a single purpose: building better wells to help its customers produce more oil and gas. Formed in 2011, Archer is the coming together of two well specialist companies, Seawell and Allis-Chalmers Energy, and several complementary businesses, each with a deep heritage in delivering wells and improving well performance. Lime Rock Partners invested in Allis-Chalmers Energy in 2009. Lime Rock Partners completed the exit of its position in Archer through public share sales in 2021.

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