Title:
余掘最適化および振動低減のための選択された変動ピッチを有する耐トラッキング性土中掘削ビット
Document Type and Number:
Japanese Patent JP2007519841
Kind Code:
A
Abstract:
An earth boring drill bit is constructed having rotatable cutter for forming a borehole in earth. At least one circumferential row of cutting elements is optimized to create overbreak of rock and eliminate tracking, wherein selected pitches have mathematically determined pairs and the absolute difference between the selected pitch and its pair is greater than 10% of the difference between maximum and minimum pitch for that circumferential row. Furthermore, cutting elements are placed along pre-selected generatrices with deviation from said generatrices, which is less than half the maximum pitch of circumferential rows occupied by said cutting element. The present invention eliminates tracking and reduces detrimental axial resonance frequency vibration while reducing cutting element count, including tungsten-carbide inserts, as compared to conventional roller cutter drill bits used for oil, gas and shot hole drilling wells and simultaneously increases footage drilled, drilling speed, and durability.
Inventors:
Aaron, Anne, Victorovna
Litvinenko, Victor
Litvinenko, Victor
Application Number:
JP2006551261A
Publication Date:
July 19, 2007
Filing Date:
January 13, 2005
Export Citation:
Assignee:
Aaron, Anne, Victorovna
Litvinenko, Victor
Litvinenko, Victor
International Classes:
E21B10/16; E21B10/08
Domestic Patent References:
| JP3010430U | 1995-05-02 | |||
| JP2002242577A | 2002-08-28 | |||
| JPS63594A | 1988-01-05 |
Attorney, Agent or Firm:
Mieko Kashihara