Source: http://www.google.es/patents/US7693695
Timestamp: 2013-06-19 13:49:54
Document Index: 683713636

Matched Legal Cases: ['Application No. 2', 'Application No. 2', 'art 2', 'art 2', 'art 1', 'art 1', 'Application No. 2']

Patente US7693695 - Methods for modeling, displaying, designing, and optimizing fixed cutter bits - Google PatentesB�squeda Im�genes Maps Play YouTube Noticias Gmail Drive M�s » B�squeda avanzada de patentes | Historial web | Iniciar sesi�n B�squeda avanzada de patentesPatentesIn one aspect, the invention provides a method for modeling the performance of a fixed cutter bit drilling an earth formation. In one embodiment, the method includes selecting a drill bit and an earth formation to be represented as drilled, simulating the bit drilling the earth formation, displaying...http://www.google.es/patents/US7693695?utm_source=gb-gplus-sharePatente US7693695 - Methods for modeling, displaying, designing, and optimizing fixed cutter bits N�mero de publicaci�nUS7693695 B2Tipo de publicaci�nConcesi�n N�mero de solicitud10/888,358 Fecha de publicaci�n6 Abr 2010 Fecha de presentaci�n9 Jul 2004 Fecha de prioridad13 Mar 2000Tambi�n publicado comoUS20050133272 N�mero de publicaci�n10888358, 888358, US 7693695 B2, US 7693695B2, US-B2-7693695, US7693695 B2, US7693695B2 InventoresPeter Thomas Cariveau, Sujian J. Huang Cesionario originalSmith International, Inc.Citas de patentes (70), Otras citas (45), Citada por (4), Clasificaciones (10) Enlaces externos: USPTO, Cesi�n de USPTO, EspacenetMethods for modeling, displaying, designing, and optimizing fixed cutter bitsUS 7693695 B2 Resumen In one aspect, the invention provides a method for modeling the performance of a fixed cutter bit drilling an earth formation. In one embodiment, the method includes selecting a drill bit and an earth formation to be represented as drilled, simulating the bit drilling the earth formation, displaying the simulating, and adjusting at least one parameter affecting the performance. The method of design is used to make a fixed cutter drill bit. In another embodiment the method includes numerically rotating the bit, calculating bit interaction with the earth formation during the rotating, and determining the forces on the cutters during the rotation based on the calculated interaction with earth formation and empirical data.
FIG. 10B shows, an exemplary illustration of a cutter/formation interaction data obtained from a series of tests conducted for a selected cutter and on selected earth formation. As shown in FIG. 10B, the cutter/formation test were repeated for a plurality of different back rake angles (e.g. −10�, −5�, 0�, +5�, +10�, etc.) and a plurality of different side rack angles (e.g., −10�, −5�, 0�, +5�, +10�, etc.). Additionally, tests were repeated for different depths of cut into the formation (e.g., 0.005″, 0.01″, 0.015″, 0.020″, etc.) at each orientation of the cutter. The data obtained from tests involving the same cutter and earth formation pair may be stored in a multi-dimensional table (or sub-database) as shown. Tests are repeated for the same cutter and earth formation as desired until a sufficient number of tests are performed to characterize the expected interactions between the selected cutter and the selected earth formation during drilling.
θ bit = ∑ i ⁢ ⁢ Δθ bit , i , 412. Δθbit,i may be set equal to 3 degrees, for example. In other implementations, Δθbit,i, may be a function of time or may be calculated for each given time step. The new location of each of the cutters is then calculated, 414, based on the known incremental rotation of the bit, Δθbit,i, and the known previous location of each of the cutters on the bit. At this step, 414, the new cutter locations only reflect the change in the cutter locations based on the incremental rotation of the bit. The newly rotated location of the cutters can be determined by geometric calculations known in the art.
θ bit = ∑ i ⁢ ⁢ Δθ bit , i . As shown in FIG. 17B, after the bit is rotated by the incremental angle, the newly rotated location of each of the cutters is calculated 324 based on the known amount of the incremental rotation of the bit and the known previous location of each cutter on the bit. At this point, the new cutter locations only account for the change in location of the cutters due to the incremental rotation of the bit. Then the axial displacement of the bit during the incremental rotation is determined. In this embodiment, the axial displacement of the bit is iteratively determined in an axial force equilibrium loop 326 based on the weight on bit (WOB) provided as input (at 310).
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