Over the past two decades in the HDD industry, the use of wash pipe for “surface casing” has become more popular.
Holly Pipe Corp.
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The NST, Nugent Special Thread, design gives the driller the ability to use many unique and non-conventional bits and tools of special sizes through the tool joint, allowing greater fluid and larger bit size. It also develops 50 percent greater torque and compression than standard API tool joints of equal grade, size and dimension.