Threaded tool joint with dual mating shoulders
US5810401A · kind A · utility
77Cited by
24References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1996 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | May 7, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/0426
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A tool joint for use in connecting sections of pipe string for use in drilling. The joint is a pin and box connection of the type used in oil well tubing, casing, and the like. The driveable threaded joint has dual mating shoulders and nose faces on the pin and box members. The connection is designed so that compressive loads on the pin and box members are transferred substantially through the pin and box shoulders rather than through the thread form. The dual mating shoulders substantially improve the joint's ability to withstand the intense axial compression loading that occurs when driving the pipe into the ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.