| US 7,523,792 B2 | ||
| Method and apparatus for shifting speeds in a fluid-actuated motor | ||
| Kosay I. El-Rayes, Dubai (United Arab Emirates); Peter J. Shwets, St. Albert (Canada); and Nazeeh Melhem, Edmonton (Canada) | ||
| Assigned to National Oilwell, Inc., Houston, Tex. (US) | ||
| Filed on Dec. 02, 2005, as Appl. No. 11/292,892. | ||
| Claims priority of provisional application 60/676342, filed on Apr. 30, 2005. | ||
| Prior Publication US 2006/0243493 A1, Nov. 02, 2006 | ||
| Int. Cl. E21B 4/02 (2006.01) | ||
| U.S. Cl. 175—92 [175/100; 175/107; 415/903; 137/253; 137/118.06; 137/119.08] | 48 Claims |
| 1. An apparatus for controlling fluid flow through a power section of a tool comprising:
a valve having a cam mechanism the cam mechanism comprising an index ring;
a first flow control path in communication with the valve for conducting a fluid through the power section of the tool; and
a second flow control path in communication with the valve for diverting the fluid around the power section of the tool, the
fluid flow through the first and second flow control paths remaining entirely inside the tool;
wherein the valve controls the amount of fluid flow through at least one of the flow control paths using the cam mechanism.
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