| 摘要 |
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. An actuator is connected to the rear end of each clamping ram for advancing and withdrawing the ram in the side bore, between a polish rod gripping position when the rams are advanced across the central bore into contact with the polish rod, and a polish rod releasing position when the rams are withdrawn from the polish rod. The invention extends to the V-groove rams themselves and to composite wellhead assemblies containing the V-groove clamping device.
|
