Method of altering a balance characteristic and moment configuration of a drill bit and drill bit
First Claim
1. A method of altering a moment configuration of a rotary-type earth-boring drill bit, comprising:
- predicting the moment configuration of the drill bit during drilling by mathematically modeling;
evaluating the moment configuration; and
modifying a drilling fluid flow characteristic of the drill bit based at least in part on said evaluating.
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Accused Products
Abstract
A method of altering the force balance characteristic or moment configuration of an earth-boring rotary-type drill bit by altering the net hydraulic direction vector of drilling fluid exiting from the drill bit and, therefore, the accompanying net hydraulic force exerted on the drill bit. The method includes replacing at least one nozzle of the drill bit with a differently sized nozzle to alter the amount of hydraulic force that is exerted on a particular portion of the drill bit. Alternatively, the orientation of at least one nozzle of the drill bit may be changed to alter the direction in which drilling fluid flows from a particular portion of the drill bit and, thus, alter the direction of the hydraulic force on the drill bit. The method may be employed to counteract a net force imbalance of a drill bit, to alter a direction of net force imbalance, or to vary the magnitude of net force imbalance.
179 Citations
31 Claims
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1. A method of altering a moment configuration of a rotary-type earth-boring drill bit, comprising:
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predicting the moment configuration of the drill bit during drilling by mathematically modeling;
evaluating the moment configuration; and
modifying a drilling fluid flow characteristic of the drill bit based at least in part on said evaluating. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of altering a balance characteristic vector of a rotary-type earth-boring drill bit, comprising:
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evaluating the balance characteristic vector by mathematically modeling rotation of the drill bit to predict the balance characteristic vector of the drill bit; and
modifying a net hydraulic force vector of a quantity of drilling fluid flowing from the drill bit based at least in part on said evaluating. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of altering a balance characteristic of a rotary-type earth-boring drill bit, comprising:
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evaluating an effect of cutting element-induced force vectors on a moment configuration of the drill bit by mathematical modeling to predict said effect of said cutting element-induced force vectors on the moment configuration; and
changing the moment configuration by;
selecting at least one nozzle sized to provide a particular hydraulic force on a portion of the drill bit as drilling fluid flows through said at least one nozzle; and
orienting said at least one nozzle to orient said particular hydraulic force against said drill bit portion in a particular direction. - View Dependent Claims (15, 16, 17)
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18. A method of refining a moment configuration of a rotary-type earth-boring drill bit, the method comprising:
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predicting an angle at which a jet of a quantity of a drilling fluid will contact a surface of a borehole of a formation to be drilled during drilling to predict an initial moment configuration of the drill bit during drilling of a formation;
comparing said initial moment configuration to a desired moment configuration;
configuring a nozzle organization to adjust the drill bit from said initial moment configuration to said desired moment configuration;
selecting at least one nozzle based at least in part on said comparing and said configuring said nozzle organization; and
disposing said at least one nozzle on the drill bit. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A method of configuring a hydraulic organization of a rotary-type earth-boring drill bit, the method comprising:
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determining an initial moment configuration of the drill bit;
selecting a desired moment configuration of the drill bit;
evaluating an effect of a surface of a borehole of a formation adjacent the drill bit said desired moment configuration and at least one cutting element-induced force vector as at least one cutting element of the drill bit cuts said formation to determine a hydraulic force vector of at least one nozzle of the drill bit required to adjust the drill bit from said initial moment configuration to said desired moment configuration; and
configuring an orientation of said at least one nozzle to bring a moment configuration of the drill bit closer to said desired moment configuration. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A method of refining a moment configuration of a rotary-type earth-boring drill bit, the method comprising:
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predicting an initial moment configuration of the drill bit during drilling of a formation;
comparing said initial moment configuration to a desired moment configuration;
configuring a nozzle organization to adjust the drill bit from said initial moment configuration to said desired moment configuration;
selecting at least one nozzle based at least in part on said comparing and said configuring said nozzle organization;
orienting said at least one nozzle to direct a quantity of drilling fluid in a direction to impart the drill bit with said desired moment configuration; and
disposing said at least one nozzle on the drill bit.
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31. A method of configuring a hydraulic organization of a rotary-type earth-boring drill bit, the method comprising:
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determining an initial moment configuration of the drill bit;
selecting a desired moment configuration of the drill bit;
evaluating a hydraulic force vector of at least one nozzle of the drill bit required to adjust the drill bit from said initial moment configuration to said desired moment configuration; and
configuring an orientation of said at least one nozzle.
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Specification