System and method for controlling drill motor rotational speed

a technology of rotating speed and drill shaft, which is applied in the direction of drilling rods, drilling pipes, drilling holes/well accessories, etc., can solve the problems of excessive wear of the rotor and/or other components of the drill string
US20050211471A1Inactive Publication Date: 2005-09-29EFFECTIVE EXPLORATION
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
EFFECTIVE EXPLORATION
Publication Date
2005-09-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

In one embodiment, a system for controlling drill motor rotational speed includes a downhole motor disposed in a drill string and having a rotor operable to be rotated by a flow of drilling fluid through the motor. The system also includes one or more by-pass ports operable to allow a portion of the drilling fluid to exit the drill string into a well bore and a governor coupled to the rotor and comprising a valve operable to move in response to the rotational speed of the rotor. The valve movement controls the amount of drilling fluid allowed to flow through the by-pass ports and exit the drill string into the well bore. The valve also directly controls the flow of the drilling fluid into the motor based on the amount of drilling fluid allowed to flow through the by-pass ports, thereby controlling the rotational speed of the rotor.
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Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates generally to systems and methods for drilling in subterranean zones and, more particularly, to a system and method for controlling drill motor rotational speed. BACKGROUND OF THE INVENTION

[0002] Subterranean drilling operations can expose well bore drilling equipment to severe operating conditions, which may be detrimental to the operating life of the equipment. To maximize drilling efficiency, well bore drilling equipment may be designed to withstand exposure to severe operating conditions for an extended period of time. However, a drill motor's operating life can be substantially affected by exposure to rotational over-speed conditions caused by inconsistencies in the flow of drilling fluid used to power the drill motor. Therefore, it is desirable to prevent or reduce such over-speed conditions. SUMMARY OF THE INVENTION

[0003] The present invention provides a system and method for controlling drill motor rotati...

Claims

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