Electrically insulative threaded connection
US5749605A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1996 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Mar 18, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L25/021
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An insulative threaded connection is provided for metal tubulars to be placed in wells or for other metal pipe. The connection contains a coating of plastic having a selected thickness which is applied to the surface of the threads of a tubular to be mated with another joint of tubular. The plastic contains particles at a selected loading such that the particles support load between the mated threaded joints. Metal is removed from the mating threads, the thickness of the metal removed being about the same as the thickness of the plastic coating. The coating may be applied to the pin end or the box end of connections. The box end may be a coupling or an integral threaded area. The insulative threaded connection is used in tubulars for improved transmission of electromagnetic signals to or from wells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.