Slim-type threaded joint for oil well pipes
US6755444B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 23, 2002 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Sep 23, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/06
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A threaded joint for oil well pipes is provided which can guarantee a joint efficiency sufficient for practical use in deep wells, which has a decreased joint outer diameter, and which has an improved bending resistance, compression resistance, and over-torque resistance which are sufficient for use by the side track technique. It is an integral threaded joint for oil well pipes in which it has a joint efficiency of at least 70%, the outer diameter of the joint is larger than and at most 1.08 times the outer diameter of the oil well pipe bodies, and the threaded portions have a cross section of a trapezoidal shape with a load flank angle (&agr;) of the threads in the range of 0 to −20 degrees and a stabbing flank angle (&thgr;) thereof in the range of 35 to 50 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.