Bottom hole assembly
US7316277B2 · kind B2 · utility
26Cited by
13References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 21, 2005 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Oct 1, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/07
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bottom hole assembly has a drill bit and an under-reamer on the up-hole side of the drill bit. In one aspect, the assembly further has a compliant element linking the drill bit to the under-reamer, the compliant element allowing displacement of the drill bit relative to the under-reamer in the axial direction of the assembly. In another aspect, the assembly further has a sensor element which is arranged to measure the weight-on-bit and/or the applied torque of the drill bit, and a transmitter for transmitting the weight-on-bit and/or applied torque measurements to the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.