CA2257885A1 - Non-symmetrical stress-resistant rotary drill bit cutter element - Google Patents

Non-symmetrical stress-resistant rotary drill bit cutter element

Info

Publication number
CA2257885A1
CA2257885A1 CA002257885A CA2257885A CA2257885A1 CA 2257885 A1 CA2257885 A1 CA 2257885A1 CA 002257885 A CA002257885 A CA 002257885A CA 2257885 A CA2257885 A CA 2257885A CA 2257885 A1 CA2257885 A1 CA 2257885A1
Authority
CA
Canada
Prior art keywords
cutter element
face
cutter
trailing
leading
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002257885A
Other languages
French (fr)
Other versions
CA2257885C (en
Inventor
Gary Ray Portwood
Gary Edward Garcia
James Carl Minikus
Per Ivar Nese
Chris Edward Cawthorne
Scott D. Mcdonough
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Smith International Inc
Original Assignee
Smith International, Inc.
Gary Ray Portwood
Gary Edward Garcia
James Carl Minikus
Per Ivar Nese
Chris Edward Cawthorne
Scott D. Mcdonough
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/668,109 external-priority patent/US5813485A/en
Application filed by Smith International, Inc., Gary Ray Portwood, Gary Edward Garcia, James Carl Minikus, Per Ivar Nese, Chris Edward Cawthorne, Scott D. Mcdonough filed Critical Smith International, Inc.
Priority claimed from PCT/US1997/010772 external-priority patent/WO1997048873A2/en
Publication of CA2257885A1 publication Critical patent/CA2257885A1/en
Application granted granted Critical
Publication of CA2257885C publication Critical patent/CA2257885C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

A cutter element that balances maximum gage-keeping capabilities with minimal tensile stress induced damage to cutter elements is disclosed. The cutter elements (150) of the present invention have a non-symmetrical shape and may include a more aggressive cutting profile than conventional cutter elements. In one embodiment, a cutter element is configured such that the inside angle at which its leading face (114) intersects the wear face (112) is less than the inside angle at which is trailing face (118) intersects the wear face (112). This can also be accomplished by providing the cutter element (160) with a relieved wear face (162). In another embodiment of the invention, the surfaces of the present cutter element (500) are curvilinear and the transitions between the leading (514) and trailing (518) faces and the gage face are rounded or contoured. In this embodiment, the leading transition is made sharper than the trailing transition.
CA002257885A 1996-06-21 1997-06-20 Non-symmetrical stress-resistant rotary drill bit cutter element Expired - Fee Related CA2257885C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US2019896P 1996-06-21 1996-06-21
US60/020,198 1996-06-21
US08/668,109 1996-06-21
US08/668,109 US5813485A (en) 1996-06-21 1996-06-21 Cutter element adapted to withstand tensile stress
PCT/US1997/010772 WO1997048873A2 (en) 1996-06-21 1997-06-20 Non-symmetrical stress-resistant rotary drill bit cutter element

Publications (2)

Publication Number Publication Date
CA2257885A1 true CA2257885A1 (en) 1997-12-24
CA2257885C CA2257885C (en) 2006-06-13

Family

ID=36587878

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002257885A Expired - Fee Related CA2257885C (en) 1996-06-21 1997-06-20 Non-symmetrical stress-resistant rotary drill bit cutter element

Country Status (1)

Country Link
CA (1) CA2257885C (en)

Also Published As

Publication number Publication date
CA2257885C (en) 2006-06-13

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20160620