|   | (Date      of report)                  | July      27, 2010 |
|--------|----------------------------------------|--------------------|
|   | (Date      of earliest event reported) | July      26, 2010 |

| Delaware                          |   | 1-12202           |   | 93-1120873               |
|-----------------------------------|--------|-------------------|--------|--------------------------|
| (State      or other jurisdiction |   | (Commission       |   | (IRS      Employer       |
| of      incorporation)            |   | File      Number) |   | Identification      No.) |

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| Item 8.01 | Other Events                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|      |  On      July 26, 2010, we announced plans to build approximately $595 million to      $730 million of natural gas liquids (NGL) projects between now and      2013. The      preliminary cost estimates for the new projects are: · $450      million to $550 million to build a 525- to 615-mile NGL pipeline that will      transport unfractionated NGLs from the           Bakke      Shale in the Williston Basin in North Dakota to our Overland Pass      Pipeline, a 760-mile NGL pipeline extending          from southern Wyoming      to Conway, Kan.; · $35      million to $40 million for related capacity expansions for our anticipated      50-percent interest in the Overland Pass        Pipeline to transport      the additional unfractionated NGL volumes from the new Bakken Pipeline;      and · $110      million to $140 million to expand our fractionation capacity at Bushton,      Kan., by 60,000 barrels per day to        accommodate      the additional      NGL volumes. The      proposed Bakken Pipeline will initially transport up to 60,000 barrels per      day (bpd) of unfractionated NGL production from our extensive natural gas      gathering and processing assets in the Bakken Shale and from third-party      natural gas processing plants south through western North Dakota and      eastern Montana to Wyoming, where it will connect to the Overland Pass      Pipeline near Cheyenne, Wyo. The volumes will then be delivered to our      existing NGL infrastructure in the Mid-Continent. Additional pump      facilities could increase the new pipeline’s capacity to 110,000      bpd. Supply      commitments for the Bakken Pipeline will be anchored by NGL production      from our natural gas processing plants and from third-party processors,      which are in various stages of negotiation. Following      receipt of all necessary permits, construction of the 12-inch diameter      pipeline will begin in the second quarter of 2012 and is currently      expected to be complete during the first half of 2013. The      additional raw NGL volumes from the new Bakken Pipeline and other supply      sources under development in the Rockies will require an investment of $35      million to $40 million for our anticipated 50-percent interest in the      Overland Pass Pipeline for additional pump stations and the expansion of      existing pump stations, increasing the capacity to the maximum of 255,000      bpd. We      also will invest $110 million to $140 million to expand and upgrade our      existing fractionation capacity at Bushton, increasing the capacity up to      210,000 bpd from 150,000 bpd. |

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| Item 9.01 | Financial Statements and      Exhibits                                                                              |
|-----------|---------------------------------------------------------------------------------------------------------------------|
|      |  Exhibits                                                                                                      |
|      | 99.1      News      release issued by ONEOK Partners, L.P. dated July 26, 2010.  |

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|   |               |   | ONEOK      Partners, L.P.By:  ONEOK      Partners GP, L.L.C., General      Partner |
|--------|--------------------|--------|----------------------------------------------------------------------------------------------|
|   |               |   |                                                                                         |
| Date:  | July      27, 2010 | By:    | /s/ Curtis L. Dinan                                                                          |
|   |               |   | Senior      Vice President -Chief      Financial Officerand      Treasurer                   |
|   |               |   |                                                                                         |