| (19) |
 |
|
(11) |
EP 1 498 574 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
17.05.2006 Bulletin 2006/20 |
| (43) |
Date of publication A2: |
|
19.01.2005 Bulletin 2005/03 |
| (22) |
Date of filing: 31.08.1999 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
GB IT |
| (30) |
Priority: |
31.08.1998 US 98466 P
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
|
03021140.3 / 1389666 |
|
99945375.6 / 1112433 |
| (71) |
Applicant: HALLIBURTON ENERGY SERVICES, INC. |
|
Carrollton, TX 75006 (US) |
|
| (72) |
Inventor: |
|
- Chen, Shilin
Dallas, TX 75248 (US)
|
| (74) |
Representative: HOFFMANN EITLE |
|
Patent- und Rechtsanwälte
Arabellastrasse 4
81925 München
81925 München (DE) |
|
| |
|
| (54) |
Method of determining a drilling parameter of a roller-cone drill bit |
(57) Disclosed herein is a method for determining a drilling parameter of each one of
a plurality of roller cones on a roller cone drill bit during drilling, comprising:
calculating, from a geometry of cutting elements on each of the roller cones and an
earth formation being drilled by the drill bit, the drilling parameter acting on each
of the cutting elements; incrementally rotating the bit and recalculating the drilling
parameter acting on each of the cutting elements; repeating the incrementally rotating
and recalculating for a selected number of incremental rotations; and combining the
drilling parameter acting on the cutting elements on each one of the roller cones.