Polish rod clamping device
US7673674B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 2007 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Apr 21, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/126
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A polish rod clamping device, for use as part of a wellhead production pumping tree to secure a polish rod. The device includes a pressure-containing body forming a central vertical and opposed first and second side bores. A pair of clamping rams are positioned in the side bores for sliding movement therealong, each clamping ram having a front and a rear end, the front ends of the clamping rams being configured to accommodate at least a portion of the polish rod between their front ends when the clamping rams are advanced across the central bore. The front end of at least one of the clamping rams is configured with a vertical V-groove for gripping the polish rod. The invention extends to the V-groove rams themselves and to composite wellhead assemblies containing the V-groove clamping device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.