| 摘要 |
<p>A gripping system is taught for gripping oil well casing, casing string or other string comprising one or more slips cammed against one or more inclined recesses when the gripping system is rotated to maintain gripping engagement of the casing. A method is taught for gripping casing sections or casing strings. The method comprises the steps of receiving a slip into each of one or more inclined recesses of a gripping system, setting said one or more slips on the casing section and rotating the gripping system to cam said one or more slips against said one or more inclined recesses, wherein camming said one or more slips against said one or more inclined recesses serves to maintain gripping engagement on the casing.</p> |
