Invention Grant
- Patent Title: Drill bit and cutting inserts for hard/abrasive formations
- Patent Title (中): 钻头和切削刀片用于硬/磨料地层
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Application No.: US11383584Application Date: 2006-05-16
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Publication No.: US07690442B2Publication Date: 2010-04-06
- Inventor: Gary Portwood , Peter Wilson , Luca Tedeschi , Bryce Baker , Daniel W. Brietzke
- Applicant: Gary Portwood , Peter Wilson , Luca Tedeschi , Bryce Baker , Daniel W. Brietzke
- Applicant Address: US TX Houston
- Assignee: Smith International, Inc.
- Current Assignee: Smith International, Inc.
- Current Assignee Address: US TX Houston
- Agency: Conley Rose, P.C.
- Main IPC: E21B10/16
- IPC: E21B10/16

Abstract:
A rolling cone drill bit comprises a plurality of bottomhole cutter elements positioned in a first circumferential row, wherein at least one of the cutter elements comprises a cutting portion extending from a base portion to a point furthermost from the base portion, defining an extension height. The ratio of the cross-sectional area of the cutter element at a point equal to ninety-four percent of the extension height to the cross-sectional area of the cutter element base is greater than 0.2. Moreover, the ratio of the extension height to the base diameter is not greater than 0.75.
Public/Granted literature
- US20060260846A1 Drill Bit and Cutting Inserts For Hard/Abrasive Formations Public/Granted day:2006-11-23
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