Threaded tool joint for connecting large diameter tubulars
US6485061B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A connector for connecting large tubulars of the type used in oil well tubing, casing and the like, without resorting to welding, to form a pipe string for use in drilling. The connector comprises a pin and box threaded connection having guiding surfaces integral with the pin and box members to facilitate the threaded connection of large tubulars. Alignment indicators may be used to provide that initial thread contact is near 360° around the circumference of the connector to provide a more even distribution of the initial contact forces on the threads rather than substantially all force acting on a smaller area of thread. This alignment also speeds the makeup of the pipe. A thread factor is provided with a desired axial length and radial length to avoid deformation of the threads. The tubular alignment using alignment indicators, centralizing effect of guidance surfaces, and thread factor may work in combination to improve the reliability, durability, and speed of making the connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.