Oneok Partners has planned to invest another $260m to $305m between now and the end of 2014 for additional projects in the Bakken Shale in the Williston Basin.

These investments include $135m to $150m for the construction of a new 100 million cubic feet per day (mmcf/d) natural gas processing facility, the Stateline II plant in western Williams County, North Dakota.

The Stateline II plant expected to be in service in the first half of 2013.

Oneok Partners also expects to invest approximately $80m to $110m for expansions and upgrades to its existing gathering and compression infrastructure.

Oneok Partners has also planned to invest approximately $45m between now and the end of 2014 for new well connections associated with the Stateline II facility.

The partnership had earlier announced plans to construct two other new natural gas processing facilities in the region – the Garden Creek and Stateline I plants.

When completed, the combined natural gas processing capacity of the Stateline II plant, the Garden Creek plant, the Stateline I plant and the existing Grasslands natural gas processing facility, will be approximately 400mmcf/d.

The Stateline II plant will be constructed adjacent to the Stateline I natural gas processing facility, which is expected to be in service during the third quarter of 2012.

The Garden Creek plant is expected to be in service during the fourth quarter of 2011.