Patent ID: 9366105
Filing Date: 2016-06-14
CPC Classification: E21B

Claim Text:
1. A lockdown mechanism and running tool for securing a casing hanger within a wellhead and sealing an annulus between a casing supported by the casing hanger and the wellhead, comprising: the casing hanger supporting a hanger seal for sealing between the casing hanger and the wellhead; a lockdown sleeve positioned in the wellhead by the running tool for limiting axial movement of the casing hanger by axially securing the casing hanger to the wellhead; a first redundant seal fluidly in series with the hanger seal for sealing between the lockdown sleeve and the wellhead; a second redundant seal fluidly in series with the hanger seal for sealing between the lockdown sleeve and the casing hanger, thereby sealing the annulus between the casing and the wellhead; and the running tool is actuated to energize at least one of the first redundant seal and the second redundant seal; the running tool including a locking piston moveable in response to fluid pressure in the running tool to temporarily lock the lockdown sleeve to the running tool while the first redundant seal is tested; and a ratch latch mechanism for maintaining the second redundant seal in position after the running tool is removed from the wellhead.