Drilling apparatus
US4040495A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1975 |
| Grant date | Aug 9, 1977 |
| Priority date | — |
| Expiry date | Dec 22, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The housing of an in-hole drill motor is provided with a deflection barrel to apply lateral force to the side of the housing directed along any desired radius. The barrel is fixedly attached to a pipe string and the motor is fixedly attached to the barrel inside the barrel. The barrel is oriented and axial force is applied to the motor housing through the pipe string from without the hole, using orientation and other signals transmitted from within the hole adjacent the motor. The signals are transmitted through an electrical conduit housed within a hydraulic conduit used to supply fluid to expand the deflection barrel shoes. The hydraulic and electric conduits are supported within the pipe string by shock mounts fixedly attached to the hydraulic conduit. The annulus between the hydraulic conduit and the pipe string provides means to transmit fluid for driving the motor and removing the detritus formed by a drill bit driven by the motor. The out-of-hole connections to the pipe string annulus and the hydraulic and electric conduits are made through a hydro-electric triple swivel. A rate of direction change limiting mechanism mounted between the bit and the barrel for rotation with t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.