High amplitude pulse generator for down-hole tools
First Claim
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1. A mud valve system for creating increased pulse amplitude signals in a wellbore, comprising:
- an inner housing body with a plurality of vent ports formed therein and configured to direct drilling mud flow to a stator;
an outer housing body enveloping the inner housing body and forming a flow channel therebetween;
the stator having a plurality of stator lobes forming a plurality of stator channels therebetween;
a rotor positioned adjacent the stator and having a plurality of rotor lobes forming a plurality of rotor channels therebetween, the rotor rotatable from a closed position to an open position and from the open position to the closed position relative to the stator, the closed position restricting drilling mud flow from the plurality of stator channels to the plurality of vent ports creating an increased positive pulse amplitude signal up-hole, and the open position increasing drilling mud flow from the plurality of stator channels through the plurality of rotor channels to the plurality of vent ports into the flow channel creating an increased negative pulse amplitude signal up hole, for communicating data from at least one down-hole device, andat least one vent port configured in the outer housing body and is in fluid communication with at least one of the plurality of vent ports in the inner housing.
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Abstract
Well systems comprise communicating devices for use in subterranean formations. An example well system comprises a mud valve system having a stator and a rotor to modulate drilling mud flow to provide increased pulse amplitude signals up-hole for improved and faster signaling from down-hole tools while also providing for better detection capability up-hole. The improved signaling technique permits for deeper well applications.
19 Citations
18 Claims
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1. A mud valve system for creating increased pulse amplitude signals in a wellbore, comprising:
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an inner housing body with a plurality of vent ports formed therein and configured to direct drilling mud flow to a stator; an outer housing body enveloping the inner housing body and forming a flow channel therebetween; the stator having a plurality of stator lobes forming a plurality of stator channels therebetween; a rotor positioned adjacent the stator and having a plurality of rotor lobes forming a plurality of rotor channels therebetween, the rotor rotatable from a closed position to an open position and from the open position to the closed position relative to the stator, the closed position restricting drilling mud flow from the plurality of stator channels to the plurality of vent ports creating an increased positive pulse amplitude signal up-hole, and the open position increasing drilling mud flow from the plurality of stator channels through the plurality of rotor channels to the plurality of vent ports into the flow channel creating an increased negative pulse amplitude signal up hole, for communicating data from at least one down-hole device, and at least one vent port configured in the outer housing body and is in fluid communication with at least one of the plurality of vent ports in the inner housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for creating increased pulse amplitude signals in a wellbore, comprising:
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rotating a rotor in a valve at a desired rate to a first position to restrict flow of drilling mud down-hole, the first position causing an increased positive pulse amplitude signal up-hole for signaling; rotating a rotor in the valve at a desired rate to a second position to increase drilling mud flow down-hole, the second position causing an increased negative pulse amplitude signal up-hole for signaling, and venting a portion of the drilling fluid into an annulus, while the rotor is in a second position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification