Air operated earth drilling tool

Details Air operated earth drilling tool Air operated earth drilling tool

E - Fixed Constructions

21

B

E21B 4/00 (2006.01) E21B 4/02 (2006.01) E21B 21/10 (2006.01) E21B 21/16 (2006.01)

Patent

CA 2356570

An air operated earth drilling tool includes a tubular housing having a first end, a second end, and an air flow passage. A filter adapted to remove solid contaminants is positioned at the first end of the housing. A metering valve is positioned on the air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed. An inner mandrel with a central air flow passage is telescopically received in the second end of the housing and is rotatable relative to the housing. One or more rotatable power section are provided with outwardly extending vanes, such that air passing by the vanes rotates the power sections. The power sections are connected to the mandrel, such that rotation of the power section rotates the mandrel.

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