Data processing: structural design – modeling – simulation – and em – Simulating nonelectrical device or system – Fluid
Reexamination Certificate
2005-04-12
2005-04-12
Paladini, Albert W. (Department: 2125)
Data processing: structural design, modeling, simulation, and em
Simulating nonelectrical device or system
Fluid
C073S152020, C073S152030, C175S048000
Reexamination Certificate
active
06879947
ABSTRACT:
A drill bit is designed to achieve optimum performance in a specified drilling application defined by the drilling system, the formation to be drilled and the configuration of the bore hole. A depth of cut versus predicted torque for a basic bit configuration is evaluated for different configurations of the drill bit. A computer modeling program is used to obtain the predicted torque for the basic bit configuration, and its modifications. Features of the bit design are changed to achieve the lowest predicted torque for an optimum depth of cut. Presenting the computer analysis as depth of cut versus predicted torque for the bit design simplifies the design selection process. The formation being drilled may be evaluated by comparing actual torque with predicted torque for a given rate of penetration. The evaluation can be used to conform the computer model and determine formation properties.
REFERENCES:
patent: 4760735 (1988-08-01), Sheppard et al.
patent: 4794534 (1988-12-01), Millheim
patent: 5415030 (1995-05-01), Jogi et al.
patent: 5465798 (1995-11-01), Edlund et al.
patent: 6408953 (2002-06-01), Goldman et al.
The SPE Image Library, SPE 11380, entitled Torque and Drag in Directional Wells—Prediction and Measurement, copyright 1984 Society of Petroleum Engineers of AIME.
Browning Bushman
Halliburton Energy Service,s Inc.
Paladini Albert W.
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