Nalco Champion, the energy services subsidiary of Ecolab Inc., acquired the assets and operations of Ultra Fab Industries Ltd., a Canadian firm that makes specialized chemical injection systems for the oil and gas industry.

Terms were not disclosed.

Ultrafab, as the company is known, makes systems that are used to remove hydrogen sulfide from oil and gas. Its revenue is expected to be $35 million this year, Ecolab said.

Ecolab, the maker of industrial cleaning solutions and equipment headquartered in St. Paul, became a major player in energy services with its $8 billion purchase of Nalco in 2011 and $2 billion purchase of Champion Technologies in 2013. The subsidiary, based in Houston, provides a variety of chemical and water treatment used in oil fields and in the processing of oil and gas. It now accounts for about one-fourth of Ecolab’s approximately $14 billion in annual revenue.

With Ultrafab’s capabilities, Ecolab said Nalco Champion picks up “a unique line of field treatment technology solutions from well head to refinery.

In a statement, Stephen Taylor, president of Nalco Champion, said, “We will expand Ultrafab’s technology by combining it with our industry-leading chemistry to enter new markets.”

Evan Ramstad