EP0155026A2
Expired / Lapsed
EP
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Rotary drill bit with cutting elements having a thin abrasive front layer
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1985-02-12
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Granted: —
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Expires: 2005-02-12
Abstract
Abstract The cutting elements 3 of a rotary drill bit comprise a thin front layer 20 of interbonded abrasive particles, such as diamonds, which layer has a thickness T less than 0.45 mm.
Inventors
- 👤 Djurre Hans Zijsling
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 18:15
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/54; E21B10/55; E21B10/56; E21B10/567
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
Rotary drill bit for deephole drilling in subsurface earth formations, the bit comprising a bit body which is suitable to be coupled to the lower end of a drill string and carries a plurality of cutting elements, characterized in that at least part of said elements comprise a front layer of interbonded abrasive particles having a thickness less than 0.45 mm.
Claim 2
Dependent Claim
61 words
Rotary drill bit for deephole drilling in subsurface earth formations, the bit comprising a bit body which is suitable to be coupled to the lower end of a drill string and carries a plurality of cutting elements, characterized in that at least part of said elements comprise a front layer of interbonded abrasive particles having a thickness less than 0.45 mm.
Claim 3
Dependent Claim
24 words
The rotary drill bit as claimed in claim 1, wherein the thickness of the front layers of the elements is more than 0.1 mm.
Claim 4
Dependent Claim
25 words
The rotary drill bit as claimed in claim 1, wherein the thickness of the front layers of the elements is between 0.2 and 0.4 mm.
Claim 5
Dependent Claim
38 words
The rotary drill bit as claimed in any one of claims 1-3, wherein the front layers of said cutting elements consist of a polycrystalline mass of abrasive diamond particles said mass being bonded to a tungsten carbide substratum.
References Cited (Backward Citations)
No citation records indexed.
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