The service specialist said the deal for Energy Resource Technology (ERT) was valued at approximately $620 million, in addition to royalty interests in the Wang discovery in the Gulf of Mexico.
Helix had been weighing the idea for several years and announced the deal last year, part of a larger programme to focus on its robotics and well-intervention business.
"The sale of ERT is an important milestone in the Company’s previously announced strategic plans to grow its Well Intervention and Robotics businesses," chief executive Owen Kratz said in a statement.
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