ONEOK Partners LP (NYSE: OKS) completed capital growth projects worth about $1 billion, the company said April 21, noting that the projects were part of its capital growth program through 2016, which has between $6 billion and $6.4 billion allocated.

Three natural gas gathering and processing and NGL projects were completed, ONEOK Partners added.

They include the Sterling III Pipeline, more than 540 miles long and 16 inches in diameter, that transports NGLS from the Midcontinent to the Texas Gulf Coast, the company said.

They also include the Canadian Valley natural gas processing facility and related infrastructure, the company added, noting that this facility processes 200 million cubic feet per day in the Cana-Woodford Shale.

"These investments continue to demonstrate our ongoing commitment to build the infrastructure necessary to better serve our producers and customers," said Terry K. Spencer , president and CEO.

"Each of these projects integrates with our existing assets in the midstream value chain. Their completion is a significant achievement that would not have been possible without the tireless efforts of our employees, contractors and suppliers," Spencer added.

ONEOK Partners has additional capital growth projects valued between $2 billion and more than $3 billion, the company said.

Tulsa-based ONEOK Partners LP is a midstream MLP working domestically.