| 摘要 |
A method and apparatus for creating positive pressure in a speed reduction tool of a drilling turbine. A first step involves providing a speed reduction tool with a floating piston having a first face in communication with a sealed planetary gear assembly and a second face. A second step involves providing means for diverting a primary flow of drilling fluids around the second face of the floating piston, thereby isolating the second face of the floating piston from the primary flow of drilling fluid. A third step involves providing a secondary drilling fluid diversion passage that extends from a selected one of a plurality of stages of a drilling turbine to the second face of the floating piston. The second face of the floating piston is exposed only to drilling fluid from the secondary drilling fluid diversion passage. A desired pressure is selected by a positioning of the secondary drilling fluid diversion passage relative to the plurality of stages.
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