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PDC drill bit using optimized side rake distribution that minimized vibration and deviation

a fixed cutter and drill bit technology, applied in the direction of instruments, analogue processes for specific applications, electric/magnetic computing, etc., can solve the problems of significant expense involved in the design and manufacture of drill bits and in the drilling of wells, and achieve the effect of optimizing the performance of fixed cutter drill bits

Inactive Publication Date: 2006-07-27
SMITH INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to methods for modeling and optimizing the performance of fixed cutter drill bits used in drilling earth formations. The methods involve using dynamic analysis to model the behavior of the drill bit during drilling and to predict its stability and performance. The methods can also involve modifying the side rake angle distribution of the cutters on the drill bit to improve its stability and performance. The invention provides a better understanding of the factors that affect the stability and performance of fixed cutter drill bits, which can aid in designing more efficient and effective drill bits for drilling in various earth formations.

Problems solved by technology

Significant expense is involved in the design and manufacture of drill bits and in the drilling of well bores.

Method used

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  • PDC drill bit using optimized side rake distribution that minimized vibration and deviation
  • PDC drill bit using optimized side rake distribution that minimized vibration and deviation
  • PDC drill bit using optimized side rake distribution that minimized vibration and deviation

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example alternative embodiments

[0196]FIG. 30 shows a partial end view of a fixed cutter bit 1200 with an alternative modification of the distribution of side rake angles along one exemplary blade 1202 having cutters 1204, 1206, 1208, 1210, and 1212 in a cone region 1214 that are positioned with their faces 1216 parallel to a radial plane 1220 through the centerline 1222 of the bit 1200. By moving the cutters 1204, 1206, 1208, 1210, and 1212 forward of the radial plane 1220 without tilting the cutters, the faces 1216 continue to be parallel to the radial plane 1220. However the offset distance 1218 causes the tangent lines 1224, 1226, 1228, 1230 and 1232 at the face of each cutter 1204, 1206, 1208, 1210, and 1212 to be at a different side rake angle 1234, 1236, 1238, 1240 and 1242, respectively, relative to the centerlines of each cutter. Thus, the side rake angle for each cutter is different and relatively larger at the center cutter 1204 and relatively smaller at cutter 1212. This shows an alternative way to mod...

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Abstract

A fixed cutter drill bit and a method for designing a fixed cutter drill bit includes simulating the fixed cutter drill bit drilling in an earth formation. A performance characteristic of the simulated fixed cutter drill bit is determined. A side rake angle distribution of the cutters is adjusted at least along a cone region of a blade of the fixed cutter drill bit to change the performance characteristic of the fixed cutter drill bit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is an application for patent and is related to co-pending and co-owned U.S. Patent Application entitled “Methods For Designing Fixed Cutter Bits and Bits Made Using Such Methods” (Attorney Docket Number 05516.191001) filed on Jul. 9, 2004, U.S. Patent Application entitled “Methods For Modeling, Displaying, Designing, And Optimizing Fixed Cutter Bits (Attorney Docket Number 05516.192001) filed on Jul. 9, 2004, U.S. Patent Application entitled “Methods for Modeling Wear of Fixed Cutter Bits and for Designing and Optimizing Fixed Cutter Bits,” (Attorney Docket Number 05516.193001) filed on Jul. 9, 2004, and U.S. Patent Application entitled “Methods For Modeling, Designing, and Optimizing Drilling Tool Assemblies,” (Attorney Docket Number 05516.194001) filed on Jul. 9, 2004, all of which are expressly incorporated by reference in their entireties.COPYRIGHT NOTICE [0002] A portion of the disclosure of this patent document contains mater...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B10/43
CPCE21B10/43E21B10/54E21B10/62
Inventor DURAIRAJAN, BALACARIVEAU, PETER THOMASHUANG, SUJIAN J.
Owner SMITH INT INC
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