|   | (Date      of report)                  | April      26, 2010      |
|--------|----------------------------------------|--------------------------|
|   | (Date      of earliest event reported) | April 21, 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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|      |  On      April 21, 2010, we announced that we will invest approximately $405      million to $470 million between now and the end of 2011 for projects in      the Bakken Shale in the Williston Basin in North Dakota and the Woodford      Shale in Oklahoma - enabling us to meet the rapidly growing needs of      producers in these areas. These projects are part of the previously      announced $2.5 billion to $3.5 billion of growth projects that we have      identified for investment between now and the end of 2015.These      investments include construction of a new 100 million cubic feet per day      (MMcf/d) natural gas processing facility - the Garden Creek      plant - in eastern McKenzie County, N. D., and related expansions      that are estimated to cost between $150 million and $210 million and will      double our natural gas processing capacity in the Williston Basin.      Completion is expected in the fourth quarter of 2011.Additional Investments      in the Bakken Shale in the Williston Basin in North      DakotaIn      addition to the construction of a new natural gas processing plant, our      natural gas gathering and processing segment will invest an additional      $200 million to $205 million during 2010 and 2011 for new well      connections, expansions and upgrades to its existing natural gas gathering      system infrastructure in the Bakken Shale.These      investments include an expansion and upgrade of the natural gas gathering      systems and adding new compression to serve the new Garden Creek plant;      natural gas gathering system and compression upgrades to bring the      existing Grasslands natural gas processing plant to its full capacity by      the end of 2010; and $90 million to connect more than 300 wells in 2010      and approximately 400 wells in 2011 to our Williston Basin natural      gas gathering system.Investments in the      Woodford Shale in OklahomaIn      2010 and 2011, we will invest an additional $55 million in the Woodford      Shale in Oklahoma with projects in our natural gas gathering and      processing and the natural gas liquids (NGL) segments.These      investments include connecting our western Oklahoma natural gas gathering      system to our existing Maysville natural gas processing facility in      central Oklahoma, allowing us to optimize our Oklahoma natural gas      processing capacity and accommodate growing volumes in the Woodford Shale      area. The project is currently under construction and expected to be      completed during the fourth quarter of 2010. These investments also      include approximately $20 million for new well connections in 2010 and      2011 to gather additional Woodford Shale natural gas volumes.In      our natural gas liquids segment, capital investments include the expansion      of our existing Oklahoma NGL gathering system to connect a new natural gas      processing plant currently under construction that is expected to be      completed in the fourth quarter of 2010. This expansion will increase the      accessibility of this new supply source to our Arbuckle Pipeline and Mont      Belvieu, Texas, fractionation facilities. Non-GAAP      Financial Measure ONEOK      Partners has disclosed in this news release anticpated EBITDA and      Distributable Cash Flow (DCF) amounts that are non-GAAP financial      measures.  We use EBITDA and DCF as measures of our financial      performance.  We define EBITDA as net income adjusted for      interest expense, depreciation and amortization, income taxes and      allowance equity funds used during construction.  We define DCF      as EBITDA, computed as described above, less interest expense, maintenance      capital expenditures and equity earnings from investments, adjusted for      cash and certain other items. We      believe that the non-GAAP financial measures described above are useful to      investors because these measurements are used by many companies in our      industry as a measurement of financial performance and are commonly      employed by financial analysts and others to evaluate the financial      performance of the partnership and to compare the financial performance of      the partnership with the performance of other publicly traded partnerships      within our industry. EBITDA      and DCF should not be considered an alternative to net income, earnings      per unit or any other measure of financial performance presented in      accordance with GAAP. These      non-GAAP financial measures exclude some, but not all, items that affect      net income. Additionally, these calculations may not be comparable to      similarly titled measures of other companies.  Furthermore,      these non-GAAP measures should not be viewed as indicative of the actual      amount of cash that we have available for distributions or that we plan to      distribute for a given period, nor do they equate to available cash as      defined in our partnership agreement. |
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| Item 9.01 | Financial Statements and      Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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|      |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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|      | 99.1      News      release issued by ONEOK Partners, L.P. dated April 21,    2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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|   |                |   | ONEOK      Partners, L.P.By:  ONEOK      Partners GP, L.L.C., General      Partner |
|--------|---------------------|--------|----------------------------------------------------------------------------------------------|
|   |                |   |                                                                                         |
| Date:  | April      26, 2010 | By:    | /s/      Curtis Dinan                                                                        |
|   |                |   | Curtis      Dinan                                                                            |
|   |                |   | Senior      Vice President –Chief      Financial Officerand      Treasurer        |