Drive shaft assembly for downhole drilling and method for using same
US11371289B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2020 |
| Grant date | Jun 28, 2022 |
| Priority date | — |
| Expiry date | Aug 5, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drive shaft assembly for use with downhole mud motors is capable of handling greater torque and thrust forces. The drive shaft assembly has an elongated central drive shaft, and at least one end housing optionally disposed at one or both ends of the central drive shaft. At least one end of the central drive shaft defines a rounded or partially-spherical outer end surface and a plurality of elongate protrusions or “keys” that extend radially outward from the exterior surface of the shaft. Each end housing has a concave interior surface defining a seat for receiving a rounded end surface of the central drive shaft, as well as a plurality of circumferentially spaced axial keyways adapted to receive and engage with the keys in mating relationship. The shaft and end assemblies cooperate to facilitate omnidirectional pivotal movement and the transfer of torque forces between the shaft and each of said end housings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.