System and method for controlling drill bit usage and well plan
US5305836A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1992 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Apr 8, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Hardware, software and methods for controlling the usage of well drill bits and other aspects of well drilling plans. At least a portion of a given well is drilled with a given drill bit. An abrasive-wear-affecting variable (drilling strength) for the lithology which has been most recently drilled with the bit is continually evaluated. The current abrasive wear of the bit by the total lithology which has been drilled thereby is continually calculated, based on the abrasive-wear-affecting variable. Continued use or retirement of the bit is controlled in accord with the wear calculation. Relative pore pressure at the current site of the drill bit is a useful by product which can be independently used to control other aspects of the well drilling plan, e.g. mud weight and the setting of casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.